First, polished before polishing ready
1, grinding and polishing personnel must be trained and obtain the qualification certificate after passing the examination, before induction.
2, a clear work process requirements, materials and initial state, the process of processing parts, shape, size and polishing accuracy requirements.
3, before polishing, you must check whether the surface to be polished, collapse, overcutting, deformation and trachoma and other defects and the remaining polishing margin is sufficient.
4, according to the process of reasonable selection of this process suitable tools, fixtures, the main, auxiliary materials.
5, according to the requirements of the workpiece on the appropriate protection.
6, re-confirm the 1-5 steps into the operating procedures.
Second, the workpiece clamping and protection
1, for the 20Kg below the higher or longer workpieces on the polishing table requires the use of bench clamps.
2, for larger, heavier workpieces to be used in the polishing table before and after the magnet, screw clamps for fastening.
3, the use of work car grinding and polishing workpieces, the use of wedges or related measures to ensure that a solid work to protect work safety.
4, for smaller and easy bruising, touching the workpiece to be used rubber sheet class to protect the type of surface.
5, sharp corners, edges and corners of the workpiece to be tape, tape protection, to prevent injury to people and work pieces or damage.
6, the need to maintain the edges and sealing glue position of the workpiece can be polished at the side of non-polished (saw blade or iron piece) or the stopper fixed protection anti-edge chamfering, rounding.
Third, self-test content and scope
1, sealing surface is the collapse, rounded;
2, whether to destroy the original draft;
3, check the size of the polished surface, to see whether the reserve more than;
4, the cavity bottom of the fillet is recessed side and bottom;
5, whether there is a tilt phenomenon;
6, the roughness has reached the drawing requirements;
7, self-test pass, send the team leader (or inspector) check.
Fourth, polishing operation precautions
1, before polishing should check whether the grinding margin is sufficient, the amount of grinding and polishing can not exceed the reserve:
After grinding the polished surface polishing amount can not exceed the reserve of 0.05 ~ 0.06mm;
Unpolished surface, electric erosion or wire cutting surface polishing amount can not exceed the reserve of 0.08 ~ 0.1mm;
Bar side and depth grinding polishing amount can not exceed the reserve of 0.03 ~ 0.08mm.
2, the use of polishing machine operation requires a high degree of concentration, to prevent the emergence of grooves, more than the allowance, does not allow a long time in the same part processing;
3, after each grinding, must be clean with Visa wipes, and then the next step grinding;
4, after each polishing, you must use cotton or soft paper wipe, and then the next step of polishing.
5, before polishing the mold, first determine the processing procedures:
According to the different original surface conditions and roughness, select the starting sequence and the desired sequence of the appropriate processes and appropriate tools (specific diamond file, # sandpaper, whetstone)
According to the geometry of the mold cavity, the basic roughness and the characteristics of the process requirements, to determine the scope of use of electric tools and grinding tools, and strive to achieve targeted processing
6, pay attention to sealing plastic surface polishing, in particular, parts of special symbols touching and sealing plastic surface can not be caused by the fillet and the collapse of the present;
7, polishing the polishing area requires clean and tidy environment, pay attention to the polished surface has been polished surface protection work;
8, some parts to be assembled after grinding together, do not allow separate grinding;
9, polished finish, polished surface self-test, after inspection submitted spray anti-rust oil, and do a good job of protection against bumps and scratches;
10, all kinds of Whetstone, sandpaper, diamond grinding paste and diamond files, etc. must be according to their type, specifications placed in the corresponding special labeling tool box.
Five, ultrasonic polishing machine
Use as follows:
Clamping sintered diamond file main processing to remove the cavity in the bottom plane, the side plane of the electric processing layer;
Clamp plating diamond file to remove the narrow plane, the cavity side walls, dead ends and sharp corners, such as the electrical processing layer and rough cutting marks;
Clamping all kinds of whetstone due to rough machining caused by the shape of the tolerance of dressing and improve the roughness;
Clamp copper, soft and hard wood and add a variety of particle size of the grinding paste to achieve precision polished surface.