Fixture is a common auxiliary tool in industrial production. Its function is to fix or clamp the workpiece and ensure the machining accuracy and safety. There are many kinds of fixtures, which can be classified according to different classification standards. This paper will classify and introduce the fixture in detail from the aspects of function, structure and application field.

I. Classification by function

1. Positioning fixture: mainly used to position and fix the workpiece so that it will not move or rotate. Common positioning clips are V-shaped blocks and parallel pads.

2. Fixture: it is mainly used to fix the workpiece on the processing equipment to prevent the workpiece from moving or rotating during the processing. Common clamps include chuck, machine tool pliers, etc.

3. Supporting fixture: it is mainly used to support strip-shaped objects and maintain their stability during processing. Common support clips include roller support frame, roller support frame and so on.

4. Adjusting fixture: it is mainly used to adjust the position and angle of the workpiece on the processing equipment to meet the machining accuracy requirements. Common adjustment clamps are angle plate, inclined plate and so on.

Second, according to the structure classification

1. Mechanical fixture: The mechanical structure is mainly used to clamp and fix the workpiece. Common mechanical clamps include chuck, machine tool pliers, manual chuck, etc.

2. Hydraulic fixture: Hydraulic principle is mainly used to clamp and fix the workpiece. Common hydraulic clamps include hydraulic chuck, hydraulic clamp and so on.

3. Pneumatic fixture: Pneumatic principle is mainly used to clamp and fix the workpiece. Common pneumatic clamps include pneumatic chuck, pneumatic pliers and so on.

4. Electromagnetic fixture: The electromagnetic principle is mainly used to clamp and fix the workpiece. Common electromagnetic tongs include electromagnetic sucker and electromagnetic tongs.

Three. Classification by application field

1. Metal processing field: mainly used for processing metal materials, such as lathes, milling machines, drilling machines, etc. Common metal processing clamps include chuck, machine tool pliers, etc.

2. Wood processing field: mainly used for processing wood, such as sawing machine and planer. Common wood processing clamps include hand saw table, suction clamp and so on.

3. Plastic processing field: mainly used for processing plastic materials, such as injection molding machines and extruders. Common plastic processing clamps include molds, suction clamps and so on.

4. Electronic products: mainly used for the assembly and testing of electronic products, such as mobile phone assembly lines and circuit board test benches. Common electronic products include PCB fixture, test needle clamp and so on.

Four, according to the shape classification

1. flat clamp: mainly used for fixing planar workpieces, such as plates and thin plates. Common flat-nose pliers include flat-nose pliers and flat-nose chuck.