Common sheet parts such as gaskets, friction plates, templates, and thin plates, due to poor rigidity, difficulty in heat dissipation, and bending after heat treatment, cause clamping deformation during clamping, and are easy to warp during grinding. Magnetic chuck is usually used for grinding on a surface grinder machine. After machining and grinding, the magnetic attraction is removed, and the thin workpiece is restored to its original state, which makes it difficult to ensure the machining accuracy. If the following clamping methods are used to ensure that the thin workpiece is positioned and clamped in a free state, and the double-end surface is used for grinding, good results can be achieved and the requirements of the machining accuracy of the parts can be met.

1. Clamping method of cushion elastic gasket
When grinding the above-mentioned thin workpiece on the surface grinder, an elastic clamping mechanism is used to realize the positioning and clamping of the thin workpiece in a free state. A layer of rubber with a thickness of 0.5mm is placed between the workpiece and the magnetic table. When the workpiece is affected by the magnetic attraction, the rubber is compressed and the elastic deformation becomes smaller, so that the flat surface of the workpiece can be ground. Repeated grinding several times can meet the requirements of machining accuracy.

2. Use temporary measures to strengthen the rigidity of sheet workpieces
The sheet workpiece is glued to a flat plate in the free state using an epoxy bond. The plate is placed on the magnetic chuck together with the sheet. After grinding one end of the sheet, the sheet workpiece is removed from the flat plate, and the flat side is placed on the magnetic chuck, and then the other end of the sheet is ground. Because the epoxy is fluid before it hardens, it can fill the gap between the thin workpiece and the flat plate. When the epoxy resin hardens, the workpiece and the plate are bonded together and become a whole, which greatly enhances the rigidity of the workpiece. Under the magnetic attraction, the thin workpiece will not be clamped and deformed, creating conditions for grinding a flat plane. Thick grease can also be used instead of epoxy resin to fill the gap between the thin workpiece and the magnetic chuck to enhance the rigidity of the workpiece, which can also achieve good results.

3. Mechanical clamping method
Use the flat-nose pliers in the accessories of the surface grinder to suck the thin workpiece by the magnetic table to hold the small flat-nose pliers. Because the flat-nose pliers have a certain height, the jaws are subject to less magnetic force. Use the method of gradually reducing the feed rate to grind one plane of the thin workpiece and then remove it. At this time, put the ground plane on the magnetic table, and then grind the other plane of the thin workpiece, and repeat the grinding several times. , the flatness of the two planes meets the requirements.

4. Vacuum clamping method
Grinding is performed by clamping thin workpieces with atmospheric pressure. The working principle is as follows: the clamping body is provided with a rubber sealing ring, and the thin workpiece is placed on the rubber sealing ring, so that a sealing cavity is formed between the workpiece and the clamping body. Use a vacuum pump to extract the indoor air from the exhaust hole, and then the workpiece is clamped. Due to the small clamping force, the grinding process can be carried out by the circumferential grinding method. After grinding the plane of one end of the thin workpiece, when grinding the plane of the other end of the thin workpiece, the above method can be used, and satisfactory results can also be obtained.