Introduction to the concept of jig and fixture knowledge

Definition of fixture

In the process of mechanical production, the processing of workpieces and the assembly of parts or machines must have a positioning clamping device; in the operation of various production lines or automated production lines, the trimming, installation, testing, and packaging of various parts and components, respectively, to complete the work as required, must also have a positioning clamping device. These bit-clamping devices are called fixtures.

Two ways of connecting metal parts

Welding (85.6%)

Riveting (14.4%)

Applications of fixtures.

In all industrial production plants, such as various types of machinery plants, electronics plants, light industrial processing plants, and food processing plants, etc., in the process of processing and production, whether manually operated or mechanized automated, the processing object must be made to position clamping, so it is necessary to use to Flexible Tooling Fixture.

Flexible Tooling Fixture is a guarantee of safe and efficient products since the machining and assembly of any object is carried out under the action of force. Any processed parts, components, and complete parts are finished according to the specified accuracy and functional requirements, so the fixture guarantees that the product quality meets the technical conditions.

Types of fixtures.

1. According to the structure form

Single structure type: Simple fixture for single use. Such as screw press, clamping vise, spiral vise, elbow joint jig, pneumatic/hydraulic rotary arm jig, etc.

Combined structure type: several general and special components, according to the needs of the combination of different uses and clamping methods of the fixture. Such as the variable coordinate position of the multi-hole system or multi-slot system of fixtures

2. According to the power source

Manual such as elbow joint clamps with handle

Pneumatic/hydraulic such as pneumatic elbow type clamps, oil/steam corner cylinder

Electric, e.g., robotics

Elbow joint quick clamping principle

When the two hinge points of the connecting rod and the connecting frame rod hinge points of one of the connecting frame rods and the frame are in a straight line, the mechanism is in the dead position. At this time, the pressed workpiece, no matter how great the reaction force (except the destructive reaction force), can not change the mechanism. So the press head will not be released. This is the dead point clamping principle in mechanical mechanics.

To avoid the influence of external load changes and mechanical vibrations in use, the middle articulation point is designed to be slight to the inner side of the line of the other two articulation points to ensure that the clamping mechanism is permanently locked in a stable state without loosening under the maximum clamping force.

Clamping force

The clamping force is the maximum clamping force of the press head on the workpiece in the locked position without mechanical deformation. This force is generated when the press head is adjusted to the position closest to the mount on the force arm. The pressing force of the indenter on the workpiece varies with the different positions of the indenter on the force arm and decreases as it moves away from the mount.

Features

1. Simple structure, easy to install

2. Clamped workpiece loading and unloading quickly, easy to operate

3. So the parts are treated with anti-rust, and the surface is clean and beautiful

4. For the heavy load Flexible Tooling Fixture, the essential parts are heat-treated process, so that it has high strength and wear resistance.