On the evening of March 31st, OPPO announced the arrival of the latest flagship OPPO R15 with a grand music carnival. This approach fits well with the audience of the OPPO. Therefore, OPPO's high popularity among young people is not without. the reason.
Before OPPO R15 was released, OPPO invited numerous media to conduct an 'OPPO R15 Quality Assurance Journey' -- visited the OPPO factory and witnessed all aspects of OPPO R15's high-end new machine production if you are also interested. , Then follow the author's footsteps to see it.
Good product starts from material selection
A product starts with material selection. The choice of material is the first step of a mobile phone, and it is also a very important part. If the choice of mobile phone materials fails, then everything behind it will be impossible. With a good foundation, OPPO has a dedicated materials laboratory, responsible for as many as 167 kinds of raw materials and about 570 test items, from the small screen to the screws, all need to undergo the first test here. The ultra-wide field of vision adopted by R15 is comprehensive. Screen fillet cutting specification, the lens module coating process standards are derived from this.
The material selection laboratory mainly includes electro-acoustic laboratory, mechanical laboratory, high-temperature laboratory, safety laboratory, environmental laboratory, climate laboratory, camera testing room, battery laboratory, electronic testing room, physical and chemical analysis room, etc. Ten sub-laboratory, covering all aspects of raw material quality inspection.
QUV (ultraviolet) aging equipment test
High temperature box
This laboratory of OPPO is mainly used to simulate user's use scenarios in various environments, and conduct corresponding tests, such as adaptability under high temperature and humidity, cold and heat shock, and low temperature environment; there are also climate and environmental factors. Neutral, acid salt spray test, QUV (ultraviolet) aging test, and flame retardant test of the adapter.
Appearance testing equipment
R15 glass back cover surface pressure test
All OPPO products are subject to a series of test items
A noticeable change in the appearance of the OPPO R15 is that the former metal material was replaced with a glass material, which is a new challenge for the detection of mobile phones. One of them is the risk of scratching, OPPO artificial sweat for this purpose, and cosmetics-resistance testing. , Baige test, pencil hardness, abrasion resistance, etc. A series of test items mainly for the surface coating of appearance parts.
Battery safety test equipment
Battery safety test
Battery high temperature test
The battery is a point that consumers are very concerned about. The OPPO conducts battery safety tests such as acupuncture tests: A steel pin is inserted through the battery itself; Thermal shock test: The battery is stored at a high temperature of 150 degrees; meanwhile Overcharging, squeezing tests, etc. are also performed to simulate the cycling performance of the battery under high and low temperature and normal operating conditions.
Headphone lifting weight and wire swing test
In addition to the above, there are also various aspects of the speaker, microphone, button, camera, adapter and other aspects of detection, so as to ensure that all the components of the raw materials are up to OPPO's strict standards.
Birth of a Motherboard
The mainboard is one of the core parts of the mobile phone. The visit also witnessed the birth of the OPPO R15 mainboard from PCB board to finished product. This is the second part of our visit: SMT center (Surface Mounted Technology surface mount Technology), which is currently the most popular technology and process in the electronics assembly industry.
OPPO motherboard production and test automation production line
The first step in the production line is to remove the dust and static electricity from the PCB board by the PCB board, and to ensure the quality of the board. The PCB board is transferred to the printing machine with the solder paste, which is the mixture of gray metal powder— It is printed on the circuit board through the stencil with holes. (Printed solder paste is mainly used as a welding function, and the component is attached to the PCB board).
It is worth mentioning here that there will be an inspection mechanism after each process. This is the Paste Thickness Tester (SPI), which is mainly to check the printing quality of the printing press, to ensure that the thickness of the solder paste printed on the board, the area, Volume, etc., to achieve the quality requirements of OPPO mobile phone motherboard.
In order to guarantee this quality requirement, according to the lecturer, OPPO's SMT shop used the world's top manufacturing equipment and set up 18 quality inspection procedures to inspect the mobile motherboard to ensure the shipment to the mainboard product. Quality. At the same time, the quality standards set by OPPO for the entire SMT production line are also at the top level in the industry, far exceeding the national standards.
The next step is the AOI, which detects the quality of the front mounter. Vertical light, 45° light, and 60° light are applied to the device body. , Polarity scanning inspection to ensure that the mounting effect of each component meets the production process requirements of OPPO. In order to not affect the inspection of AOI, OPPO has moved large components such as shielding frames, three-in-one card slot to automatic optical inspection. Behind the machine.
After the furnace automatic optical inspection machine, is mainly to check the welding of the components after the furnace, such as whether there is false welding, tin and other adverse conditions, to ensure the quality of welding components.
In the above process, one side of a motherboard is mounted, and then the motherboard needs to be turned over to the front of the production line to complete the other side of the production line. One board takes up to 40 minutes to complete mounting on both sides. After checking the project, the barcode of the mobile phone's mainboard is swept into the MES (Information Management System), which can be traced back to the detailed production information of the motherboard.
Under such a high level of requirements, according to OPPO production line engineers, the SMT Center's production of mainboard products is as high as 99.9%, and it is at the leading level in the entire industry.
Assembly line workers are assembling OPPO R15
Test production line adopts automatic test equipment to detect the whole machine more intelligently
After passing the stringent inspections of raw materials and motherboards, they will enter the final assembly shop for assembly. The entire assembly process includes two parts: first, production assembly, and second, performance testing. The production and assembly links are formulated with strict standard operating instructions (SOPs). In order to ensure that there will be no abnormality in the assembly process, the performance testing process is to test the function of the entire machine with the help of automated test equipment, and it will enter the next stage after ensuring that there is no abnormality in the mobile phone.
Abuse - OPPO is serious
After completing the process of assembling the mobile phone in the previous process, it is still not finished. The next step is the detection of the mobile phone, which is the last and most important part of the entire quality inspection process.
The OPPO will conduct sampling inspections from the assembled mobile phones. The sampled mobile phones need to undergo performance tests, structural tests (destructive, structural insertion and removal), environmental aging tests (various environmental adaptability, and continuous aging of functional devices), etc. Only after the experimental test can it enter mass production, but here is OPPO's QE Reliability Mobile Lab.
Performance Testing
Specifically speaking, the performance test is the test of the radio frequency indicators (transmitting and receiving signals during cell phone conversations and network receiving indicators when using data networks and Bluetooth, WiFi) and audio and video (cell phone receiver quality and speaker reception quality). Including temperature rise test, it simulates the function of the user to use the mobile phone, such as: game, video, video, call, etc., to test whether the surface and back temperature of the mobile phone are within the temperature range of the OPPO standard and the requirements of the user experience;
Static electricity test
Static electricity test, verify the reliability of the mobile phone device under the static interference of the mobile phone, will use: ±8kV (contact discharge), ±12kV (air discharge) voltage to test (limit voltage will hit 16KV), under the interference of these voltages All functions of the mobile phone are required to be displayed properly, including the RF index parameters must be within the specified range; SAR test: test the radiation size of the mobile phone, to detect whether the mobile phone radiation meets the standard requirements.
Structural testing is a test closely related to us. It is also the most common way we use mobile phones to cause damage to mobile phones. For example, mobile phones are dropped, bumped, and keys are broken, etc. All belong to the scope of this type of testing.
Including the repeated drop test, which is to simulate the destructive test of the user's mobile phone on the table and other environments, the OPPO set its height at 10cm, and dropped 20,000 times on the front and back, and also dropped each side, with 4,000 drops on each side. , Each machine dropped 56,000 times in total. During the process of dropping, there were no functional failures, no dropping of components and accessories, and after the experiment, the mobile phone would be disassembled and inspected for structural damage inside the mobile phone.
Corresponding to this is the free fall test, which is also what we often encounter. If the mobile phone accidentally falls to the ground in the hand. In this regard, the OPPO's minimum drop standard is 1cm, the ground is marble, the phone's 6 sides, 8 corners, and 12 edges must be dropped. Each face, corner, and edge must be dropped 2 times. Every fall should be checked in all directions. No functional failure is allowed, and the shell is cracked. Dropping of the device and other anomalies. After the first round of falling, multiple rounds of extreme drop (10 rounds) will be performed to verify the functions of the mobile phone. The 1.5-meter and 1.8-meter 10-round drop is mainly aimed at the function and battery safety of the mobile phone. Sex.
The button click test will use the 1kg force to click the side keys of the OPPO phone, and clicks 100,000 times in total. During the click, it is not allowed to feel bad keys, the buttons have no function, the button breaks and other abnormalities, and the number of fingerprint button clicks is 1 million times; Headphones and USB plug-in tests are divided into machine plugs and manual plugs. The machine plugs in and out are 10,000 plugs with different plugging and unplugging forces. Manual plugging is 10,000 man-made analog plugs. 360-degree rotation plugging and unplugging is not allowed during the process, abnormalities such as no function and poor contact are not allowed during the process. After plugging and unplugging is completed, it will be disassembled to check whether there are abnormalities such as USB and headphones welding and desoldering, and damage.
Roller falling
In addition to the above, the structural test also includes various tests such as distortion test, complete machine stress test, roller drop, soft pressure test, etc. The scope covers the various situations in which we usually use mobile phones.
Salt spray test equipment
High and low temperature test equipment
The environmental experiment is to simulate the environment of each area and the environment that the user manufactures during daily use. The maximum ambient temperature reaches 85 degrees, the minimum temperature is -40 degrees, such as rain test, salt spray test, artificial sweat test, cosmetics Testing, high and low temperature aging, In addition, in order to be more close to the user's daily life, the beer in the user's life, acid and alkaline beverages, red wine, white wine, coffee, detergent, insect repellent, shampoo, hand soap , Lipstick, makeup remover, vinegar and other household items were all simulated.
Since the OPPO R15 was made of glass, OPPO engineers set up new testing procedures specifically for double-glazed glass materials, such as new drop tests and safety tests, such as taking the sampling machine to the road, parking lot, track, etc. Perform a drop test, the most likely scenario to restore the user's real use.
The above list of test items is only a small part of more than one hundred and fifty tests. Each model of the OPPO machine undergoes these tests. After reaching the standard requirements, it can enter mass production. The next step is the user.
Mobile phone antenna performance test equipment
OPPO customized CTIA 3.1 simulation head, simulate the use of mobile phone users
In addition, a number of 'microwave anechoic chambers' established by OPPO are also impressive. They not only purchase internationally advanced equipment, but also belong to a large number of domestic manufacturers, the existence of 'microwave anechoic chambers', ensuring the availability of mobile phones. The most basic call function is more stable.
Quality Department - 'Quality is the dignity of the product'
At OPPO, there is a special department for the production system, which is independent of other departments, and is full of power over other departments - the Quality Department.
It is not affected by shipping pressures. It can suspend shipments, suspend production, and have a 'vote for veto'. They have a unique set of sign theory: quality is the sign in front of reputation, quality is good, and quantity is done The more you have, the louder your name is. The poorer quality is the negative sign. The more you sell, the worse your reputation.
The Quality Department runs through all the processes from material selection to quality verification in mobile phones. It is completely self-serving and will not tolerate any problems. It will not leave the problem to the next link. And every employee in the Quality Department must not only be familiar with product quality inspection that exceeds international standards. Skills, quality improvement methods and tools, but also familiar with the company's product performance and process, manufacturing process, but also be familiar with new projects, new product expertise.
Due to the rigorous work attitude of the quality department, each machine has four rounds of trial production before it is put on the market. These trial production machines are used for various experiments. Basically, each machine can meet the mass production standards. Until the time of listing, there are tens of thousands of machines destroyed. A good quality product will be 'speaking'. In last year's "China Mobile Terminal Quality Report," after communication capabilities, multimedia capabilities, product availability, and user word-of-mouth In a comprehensive test conducted in each dimension, OPPO R11s ranked first in terms of both communication capability and product availability. It eventually became the first place in the quality list for price lists of RMB 2000-3000, and it was the top ten most popular in 2017 in China. Exclusive three seats in the model.
The new generation of OPPO R15 not only experienced the same rigorous testing procedures as R11s, but also added new processes for some new features, making the quality inspection of each step even more demanding. R15, better quality than R11s.
On the evening of March 31st, OPPO announced the arrival of the latest flagship OPPO R15 with a grand music carnival. This approach fits well with the audience of OPPO. Therefore, OPPO's high popularity among young people is not without. the reason.
Before OPPO R15 was released, OPPO invited numerous media to conduct an 'OPPO R15 Quality Assurance Journey' -- visited the OPPO factory and witnessed all aspects of OPPO R15's high-end new machine production if you are also interested. , Then follow the author's footsteps to see it.
Good product starts with material selection
A product starts with material selection. The choice of material is the first step of a mobile phone, and it is also a very important part. If the selection of mobile phone materials fails, then everything behind it will be impossible. With a good foundation, OPPO has a dedicated materials laboratory, responsible for as many as 167 kinds of raw materials and about 570 test items, from the small screen to the screws, all need to undergo the first test here. The ultra-wide field of vision adopted by R15 is comprehensive. Screen fillet cutting specification, the lens module coating process standards are derived from this.
The material selection laboratory mainly includes electro-acoustic laboratory, mechanical laboratory, high-temperature laboratory, safety laboratory, environmental laboratory, climate laboratory, camera testing room, battery laboratory, electronic testing room, physical and chemical analysis room, etc. Ten sub-laboratory, covering all aspects of raw material quality inspection.
QUV (ultraviolet) aging equipment test
High temperature box
This laboratory of OPPO is mainly used to simulate user's use scenarios in various environments, and conduct corresponding tests, such as adaptability under high temperature and humidity, cold and heat shock, and low temperature environment; there are also climate and environmental factors. Neutral, acid salt spray test, QUV (ultraviolet) aging test, and flame retardant test of the adapter.
Appearance testing equipment
R15 glass back cover surface pressure test
All OPPO products are subject to a series of test items
A noticeable change in the appearance of the OPPO R15 is that the former metal material was replaced with a glass material. This is a new challenge for the detection of mobile phones. One of them is the risk of scratching, OPPO artificial sweat for this purpose, and cosmetics-resistance testing. , Baige test, pencil hardness, abrasion resistance, etc. A series of test items mainly for the surface coating of appearance parts.
Battery safety test equipment
Battery safety test
Battery high temperature test
The battery is a point that consumers are very concerned about. The OPPO conducts battery safety tests such as acupuncture tests: A steel pin is inserted through the battery itself; Thermal shock test: The battery is stored at a high temperature of 150 degrees; meanwhile Overcharging, squeezing tests, etc. are also performed to simulate the cycling performance of the battery under high and low temperature and normal operating conditions.
Headphone lifting weight and wire swing test
In addition to the above, there are also various aspects of the speaker, microphone, button, camera, adapter and other aspects of detection, so as to ensure that all the components of the raw materials are up to OPPO's strict standards.
Birth of a Motherboard
The mainboard is one of the core parts of the mobile phone. The visit also witnessed the birth of the OPPO R15 mainboard from PCB board to finished product. This is the second part of our visit: SMT center (Surface Mounted Technology surface mount Technology), which is currently the most popular technology and process in the electronics assembly industry.
OPPO motherboard production and test automation production line
The first step in the production line is to remove the dust and static electricity from the PCB board by the PCB board, and to ensure the quality of the board. The PCB board is transferred to the printing machine with the solder paste, which is the mixture of gray metal powder— It is printed on the circuit board through the stencil with holes. (Printed solder paste is mainly used as a welding function, and the component is attached to the PCB board).
It is worth mentioning here that there will be an inspection mechanism after each process. This is the Paste Thickness Tester (SPI), which is mainly to check the printing quality of the printing press, to ensure that the thickness of the solder paste printed on the board, the area, Volume, etc., to achieve the quality requirements of the OPPO mobile phone motherboard.
In order to guarantee this quality requirement, according to the lecturer, OPPO's SMT workshop used the world's top manufacturing equipment and set up 18 quality inspection procedures to inspect the mobile motherboard to ensure shipment to the mainboard product. Quality. At the same time, the quality standards set by OPPO for the entire SMT production line are also at the top level in the industry, far exceeding the national standards.
The next step is the AOI, which detects the quality of the front mounter. Vertical light, 45° light, and 60° light are applied to the device body. , Polarity scanning inspection to ensure that the mounting effect of each component meets the production process requirements of OPPO. In order to not affect the inspection of AOI, OPPO has moved large components such as shielding frames, three-in-one card slot to automatic optical inspection. Behind the machine.
After the furnace automatic optical inspection machine, is mainly to check the welding of the components after the furnace, such as whether there is false welding, tin and other adverse conditions, to ensure the quality of welding components.
In the above process, one side of a motherboard is mounted. Next, the motherboard needs to be flipped over to the front of the production line to complete the other side of the rail. Another board takes up to 40 minutes to complete the board mounting process. After checking the project, the barcode of the mobile phone's mainboard is swept into the MES (information management system) and can be traced back to the motherboard for detailed production information.
Under such a high level of requirements, according to OPPO production line engineers, the SMT Center's production of mainboard products is as high as 99.9%, and it is at the leading level in the entire industry.
Assembly line workers are assembling OPPO R15
Test production line adopts automatic test equipment to detect the whole machine more intelligently
After passing the stringent inspections of raw materials and motherboards, they will be assembled in the final assembly shop. The entire assembly process will consist of two parts, one is production assembly, and the other is performance testing. The production and assembly links are formulated with strict standard operating instructions (SOPs). In order to ensure that there will be no abnormality in the assembly process, the performance testing process is to test the function of the entire machine with the aid of automated test equipment, and it will enter the next stage after ensuring that there is no abnormality in the mobile phone.
Abuse - OPPO is serious
After completing the process of assembling the mobile phone in the previous process, it is still not finished. The next step is the detection of the mobile phone, which is the last and most important part of the entire quality inspection process.
The OPPO will conduct sampling inspections from the assembled mobile phones. The sampled mobile phones need to undergo performance tests, structural tests (destructive, structural insertion and removal), environmental aging tests (various environmental adaptability, and continuous aging of functional devices), etc. Only after the experimental test can it enter mass production, but here is OPPO's QE Reliability Mobile Lab.
Performance Testing
Specifically speaking, the performance test is the test of the radio frequency indicators (transmitting and receiving signals during cell phone conversations and network receiving indicators when using data networks and Bluetooth, WiFi) and audio and video (cell phone receiver quality and speaker reception quality). Including temperature rise test, it is to simulate the function of the user to use the mobile phone, for example: game, video, video, call, etc., to test whether the surface and back temperature of the mobile phone are within the OPPO standard temperature range and the user experience requirements;
Static electricity test
Static electricity test, verify the reliability of the mobile phone device under the static interference of the mobile phone, will use: ±8kV (contact discharge), ±12kV (air discharge) voltage to test (limit voltage will hit 16KV), under the interference of these voltages All functions of the mobile phone are required to be displayed properly, including the RF index parameters must be within the specified range; SAR test: test the radiation size of the mobile phone, to detect whether the mobile phone radiation meets the standard requirements.
Structural testing is a test closely related to us. It is also the most common way we use mobile phones to cause damage to mobile phones. For example, mobile phones are dropped, bumped, and keys are broken, etc. All belong to the scope of this type of testing.
Including the repeated drop test, which is to simulate the destructive testing of the user's mobile phone on the table and other environments, the OPPO set its height at 10cm, and fell 20,000 times on the front and back, and also dropped on each side. Each side fell 4,000 times. , Each machine dropped 56,000 times in total. During the process of dropping, there were no functional failures, no dropping of components and accessories, and after the experiment, the mobile phone would be disassembled and inspected for structural damage inside the mobile phone.
Corresponding to this is the free fall test, which is also what we often encounter. If the mobile phone accidentally falls to the ground in the hand. In this regard, the OPPO's minimum drop standard is 1cm, the ground is marble, and the phone's 6 sides, 8 corners, and 12 edges must be dropped. Each face, corner, and edge must be dropped 2 times. Every fall should be checked in all directions. No functional failure is allowed, and the shell is cracked. Dropping of the device and other anomalies. After the first round of falling, multiple rounds of extreme drop (10 rounds) will be performed to verify the functions of the mobile phone. The 1.5-meter and 1.8-meter 10-round drop is mainly aimed at the function and battery safety of the mobile phone. Sex.
The button click test will use the 1kg force to click the side keys of the OPPO phone, and clicks 100,000 times in total. In the process of clicking, it is not allowed to feel bad buttons, the button has no function, the button breaks and other abnormalities, and the number of fingerprint button clicks is 1 million times; Headphones and USB plug-in tests are divided into machine plugs and manual plugs. The machine plugs in and out are 10,000 plugs with different plugging and unplugging forces. Artificial plugging is 10,000 man-made analog plugs. 360-degree rotation plugging and unplugging is not allowed during the process, abnormalities such as no function and poor contact are not allowed. After plugging and unplugging is completed, it will be disassembled to check if there are abnormalities such as USB and headphones welding and desoldering, and damage.
Roller falling
In addition to the above, the structural test also includes various tests such as distortion test, complete machine stress test, roller drop, soft pressure test, etc. The scope covers the various situations in which we usually use mobile phones.
Salt spray test equipment
High and low temperature test equipment
The environmental experiment is to simulate the environment of each area and the environment that the user manufactures during daily use. The maximum ambient temperature reaches 85 degrees, the minimum temperature is -40 degrees, such as rain test, salt spray test, artificial sweat test, cosmetics Testing, high and low temperature aging, In addition, in order to be more close to the user's daily life, the beer in the user's life, acid and alkaline beverages, red wine, white wine, coffee, detergent, insect repellent, shampoo, hand soap , Lipstick, makeup remover, vinegar and other household items were all simulated.
Since the OPPO R15 was made of glass, OPPO engineers set up new testing procedures specifically for double-glazed glass materials, such as new drop tests and safety tests, such as taking the sampling machine to the road, parking lot, track, etc. Perform a drop test, the most likely scenario to restore the user's real use.
The above list of test items is only a small part of more than one hundred and fifty tests. Each model of the OPPO machine undergoes these tests. After reaching the standard requirements, it can enter mass production. The next step is the user.
Mobile phone antenna performance test equipment
OPPO customized CTIA 3.1 simulation head, simulate the use of mobile phone users
In addition, a number of 'microwave anechoic chambers' established by OPPO are also impressive. They not only purchase internationally advanced equipment, but also belong to a large number of domestic manufacturers, the existence of 'microwave anechoic chambers', ensuring that mobile phones The most basic call function is more stable.
Quality Department - 'Quality is the dignity of the product'
At OPPO, there is a special department for the production system, which is independent of other departments, and is full of power over other departments - the Quality Department.
It is not affected by shipping pressures. It can suspend shipments, suspend production, and have a 'vote for veto'. They have a unique set of sign theory: quality is the sign in front of reputation, quality is good, and quantity is done The more you have, the louder your name is. The poorer quality is the negative sign. The more you sell, the worse your reputation.
The Quality Department runs through all the processes from material selection to quality verification in mobile phones. It is completely self-serving and will not tolerate any problems. It will not leave the problem to the next link. And every employee in the Quality Department must not only be familiar with product quality inspection that exceeds international standards. Skills, quality improvement methods and tools, but also familiar with the company's product performance and process, manufacturing process, but also be familiar with new projects, new product expertise.
Due to the rigorous work attitude of the quality department, each machine has four rounds of trial production before it is put on the market. These trial production machines are used for various experiments. Basically, each machine can meet the mass production standards. Until the time of listing, there are tens of thousands of machines destroyed. A good quality product will be 'speaking'. In last year's "China Mobile Terminal Quality Report," after communication capabilities, multimedia capabilities, product availability, and user word-of-mouth In a comprehensive test conducted in each dimension, OPPO R11s ranked first in terms of both communication capability and product availability. It eventually became the first place in the quality list for price lists of RMB 2000-3000, and it was the top ten most popular in 2017 in China. Exclusive three seats in the model.
The new generation of OPPO R15 not only undergoes the same rigorous testing procedures as R11s, but also adds new processes for some new features, making the quality inspection of each step even more demanding. R15, better quality than R11s.
