Molded product appearance, size, fit
1, the product surface does not allow defects: lack of material, charred, top white, white lines, Pifeng, blisters, pull white (or pull crack, pull off), baked India, wrinkles.
2. Welding line mark: The length of the general round perforated weld line is not more than 5mm, and the length of the perforated line weld line is less than 15mm. The weld line intensity can pass the functional safety test.
3, Shrinkage: No shrinkage is allowed at the apparent surface, and slight shrinkage is not allowed at the apparent area (feeling is not dent).
4. The flatness of small flat products is generally less than 0.3mm, and assembly requirements must be ensured.
5, Appearance obviously can not have gas lines, flowers, products generally can not have air bubbles.
6, the product geometry, size and size accuracy should be consistent with the official and effective mold drawing (or 3D file) requirements, product tolerances based on tolerance principle, the shaft size tolerance for negative tolerance, hole size tolerance is positive tolerance, the customer has Required on request.
7, the product wall thickness: product wall thickness is generally required to achieve the average wall thickness, non-average wall thickness should be consistent with the drawings, tolerances should be based on the mold characteristics -0.1mm.
8, the product with: shell bottom shell with the surface - the surface of less than 0.1mm, can not have the phenomenon of scraping the hand, with the requirements of the hole, shaft, surface to ensure that with the spacing and use requirements.
Mold appearance
1, Die nameplate complete, character clear, neatly arranged.
2, nameplate should be fixed in the mold near the template and the reference corner of the place. Nameplate is fixed and reliable, not easy to peel off.
3, cooling faucets should be used plastic plug, customers otherwise requested by the requirements.
4, cooling faucet should not stick out the mold surface.
5, cooling faucets need to deal with counterbore, counterbore diameter of 25mm, 30mm, 35mm three specifications, chamfer, chamfer should be consistent.
6, cooling faucets should be out of the mark.
7, mark English characters and numbers should be greater than 5.
8, the location of 10mm at the faucet just below, the writing should be clear, beautiful, neat, uniform spacing.
9, Mold parts should not affect the lifting and storage of mold.Equipped below the exposed cylinder, faucet, pre-reset mechanism, etc., should be support leg protection.
10, supporting the installation of the use of screws through the support leg fixed to the mold frame, the long support legs can be machined with threaded studs fastened on the mold frame.
11, the size of the mold top hole should meet the requirements of the specified injection molding machine, with the exception of small molds, not only with a center of the top.
12, the positioning ring should be fixed and reliable, the ring diameter of 100mm, 250mm two, positioning ring above the floor 10 ~ 20mm. Customers unless otherwise requested.
13, mold dimensions should be consistent with the requirements specified injection molding machine.
14, the direction of the mold installed with the direction of the front or rear template should be marked with the arrow installation direction, arrow next to the word 'UP', the arrow and the text are yellow, the word height of 50 mm.
15, the mold surface should not have pits, rust, excess rings, out of water vapor, oil holes, as well as the appearance of defects.
16, the mold should be easy to lift, transport, lifting mold parts and components shall not be disassembled, rings shall not faucet, cylinder, pre-reset lever and other interference.
Mold material and hardness
1, mold mold should be used in line with the standard standard mold.
2, mold forming parts and pouring system (core, fixed die inserts, removable inserts, split cone, push rod, sprue sleeve) material properties higher than 40Cr material.
3, forming the mold is easy to corrosion of plastic, the molding parts should be made of corrosion-resistant materials, or its molding surface should take anti-corrosion measures.
4, mold forming parts hardness should not be less than 50HRC, or surface hardening hardness should be higher than 600HV.
Die, reset, insert the core, take pieces
1, the top should be smooth, no card delay, no abnormal sound.
2, inclined top surface should be polished, lower than the core surface of the inclined top.
3, the sliding parts should be opened oil tank, the surface to be nitriding treatment, the surface hardness of HV700 after treatment.
4, all ram should stop position, each ram should be numbered.
5, the top of the application limit block limit.
6, the return spring should use standard parts, both ends of the spring shall not be polished, cut off.
7, the slider, the core should be stroke limit, a small slider with a spring limit, the inconvenience of spring installation can be used when the wave screw; cylinder core must have a travel switch.
8, Slider core generally used oblique guide column, oblique guide column angle should be smaller than the locking surface of the slider angle 2 ° -3 °. Slider stroke should be drawn by the cylinder.
9, cylinder core forming part of the core is covered, the cylinder should be self-locking mechanism.
10, the slider width of more than 150mm large slide below should be wear plate, wear plate material should be used T8A, after heat treatment hardness HRC50-55, wear plate higher than the large 0.05-0.1 mm, and open Oil tank.
11, mandrel should not move up and down.
12, the bar plus barbs, barb direction should be consistent, barbs easy to remove from the product.
13, mandrel hole and mandrel with the gap, Sealant length, mandrel hole surface roughness should be based on the relevant business standards.
14, products should be helpful for operators to remove.
15, when the product is easy to go with the top ramp, the top bar should be added slot or etchings.
16, the top block fixed on the mandrel, should be solid and reliable, around the non-forming part should be processed 3 ° -5 ° slope, the lower periphery should be chamfered.
17, mold hole on the oil hole should be no debris.
18, back lever surface smooth, no spot welding. No head gasket embryo, spot welding.
19, three-mode gate gate guide sliding smoothly, gate plate easy to pull open.
20, the three-plate mold limit rod should be arranged in both sides of the mold installation direction, or in the mold frame plus pull plate to prevent the limit rod and the operator interference.
21, oil airway should be smooth, hydraulic ejection reset should be in place.
22, the bottom guide sleeve should be made exhaust.
23, positioning pin installation can not have gaps.
Cooling, heating system
1, cooling or heating system should be fully open.
2, the seal should be reliable, the system can not leak under the pressure of 0.5MPa, easy to overhaul
3, the size and shape of the seal groove set up on the mold frame should meet the requirements of relevant standards.
4, the seal ring should be smeared butter, placed above the mold surface.
5, water, oil flow channel septa should be less susceptible to corrosion of the material.
6, before and after the mold should be used to focus on water.
Gating system
1, the gate should not affect the appearance of product design, product assembly to meet.
2, the flow path section, the length should be reasonable design, to ensure the quality of forming the premise to minimize the process to reduce the cross-sectional area to shorten the filling and cooling time, while pouring system loss of plastic should be minimal.
3, three plate mold runner in the back of the front section of the cross section should be trapezoidal or semi-circular.
4, the three-plate mold in the gate plate has broken material, the inlet diameter of the runner should be less than 3mm, the ball head at the recess gate plate a deep 3mm steps.
5, the ball pull the rod should be reliable fixed, can be pressed under the positioning ring can be fixed without screws, you can also use the pressure plate to suppress.
6, the gate, runner should be required by the drawing size machine should be processed, do not allow manual rejection mill processing.
7, point gate should be required by the specification.
8, the diversion front should have a section of Leng Leng as a hole.
9, pull rod Z-shaped buckle should be a smooth transition.
10, parting surface of the runner should be round, before and after the mold can not be dislocation.
11, Submerged gate on the rod should be no surface shrinkage.
12, the diameter of the transparent material cold hole, the depth should meet the design standards.
13, the material is easy to remove, the appearance of the product without gate marks, there is no residue in the product assembly.
14, bending hook submersible gate, two parts of the insert should be nitrided, the surface hardness reaches HV700.
Molding section, parting surface, exhaust slot
1, the front and rear mold surface should not have uneven, pits, rust and other defects that affect the appearance.
2. The inserts should be matched with the frame, and the roundness around the edges should be less than 1mm.
3, The parting surface is kept clean and tidy, no hand wheel grinding is used to avoid the air, and the sealing part has no hollow.
4. The depth of the exhaust groove should be less than the overflow value of the plastic.
5, Inserts should be placed in place, placed smoothly, reliable positioning.
6, insert block, insert the core should be reliable positioning and fixed, round pieces have stop, insert the following pad is not pad copper, iron.
7, mandrel face and the same core.
8, before and after the mold part of the inverted buckle, chamfer and other defects.
9, tendons top should be smooth.
10, multi-cavity mold products, left and right pieces symmetrical, should be marked L or R, the customer on the location and size requirements, should meet the customer requirements, generally without affecting the appearance and assembly of the place, the font size of 1/8 .
11, mold locking surface should be in place, more than 75% of the area encountered.
12, ram should be arranged closer to the side walls and ribs, bosses next to, and the use of larger ram.
13, for the same piece should be numbered 1, 2, 3 and so on.
14, each touch through the surface, inserted through the surface, parting surface should be allocated in place.
15, parting surface sealant part should meet the design standards.Middle the following mold 10-20mm, large mold 30-50mm, the rest of the machining avoidance.
16, striae and sandblasting should be uniform to meet customer requirements.
17, the appearance of the required products, products should be anti-shrinkage screws.
18, the depth of more than 20mm screw column should be selected pipe jacking.
19, product wall thickness should be uniform, deviation control in ± 0.15mm below.
20, the width of the ribs should be less than 60% of the wall thickness of the appearance.
21, oblique top, slider on the core should be a reliable way of fixing.
22, after the front mold into the mold or after the mold into the front mold, surrounded by bevel locking and machining avoidance.
Injection molding process
1, the mold in the normal injection molding process conditions, should have the stability of injection molding process parameters and the repeatability of tuning.
2, injection molding mold injection pressure, injection molding machine should generally be less than the maximum rated injection pressure of 85%.
3, the injection speed when the mold injection molding, the injection speed of three-fourths of its stroke is not less than 10% of the rated maximum injection speed or more than 90% of the rated maximum injection speed.
4, mold injection pressure packing pressure should generally be less than the actual maximum injection pressure of 85%.
5, mold injection mold clamping force, should be less than 90% of the rated clamping force of the applicable model.
6, injection molding production process, the product and outlet materials to be taken out easy and safe (time generally not more than 2 seconds).
7, with the mold inserts products, inserts in the production of convenient installation, fixed inserts to be reliable.
Packing and shipping
1, the mold cavity should be clean spray anti-rust oil.
2, the sliding parts should be coated with oil.
3, the inlet of the sprue sleeve is sealed with grease.
4, the mold should be installed locking film, the specifications meet the design requirements.
5, spare parts consumables should be complete, accompanied by schedule and supplier name.
6, mold water, liquid, gas, electricity import and export should take sealing measures to prevent foreign body sealing.
7, the outer surface of the mold spray paint, the customer has requested by the requirements.
8, the mold should be moisture-proof, waterproof, to prevent bump packaging, the customer has requested by the requirements.
9, Die product drawings, structural drawings, cooling heating system drawings, hot runner drawings, spare parts and mold material supplier details, instructions, test mode report, the factory inspection certificate, electronic documentation should be complete.