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A brief understanding of the positioning pin
Release time:
2022-03-17
The positioning pin is a part that participates in limiting the degree of freedom of an object. It has certain applications in some mechanical motion equipment, and is mainly used for positioning in two-dimensional space. The positioning pin takes the workpiece hole as the positioning reference, participates in the part that limits the degree of freedom of the object, and controls the object inX, Y, Z, six axes on the three axes of linear motion. Free rotational motion around X, Y, and Z. In a mold composed of two or more parts, a pin used to position two adjacent parts of the mold.
When the machine body is connected by multiple parts, and each part needs to maintain an accurate position during processing and assembly, positioning pins should be used for positioning. For example, the split box is composed of a cover and a base, and the machining accuracy of the upper Bearing hole is relatively high. Therefore, in the design, the two positioning pins should be set at a far apart position on the split surface to ensure the accuracy of processing and assembly.
Locating pin features:
1. The positioning pin has the characteristics of simple structure, good neutrality, high load-bearing capacity, good load change and impact performance, but the positioning pin has high requirements for the processing accuracy of the mating surface.
2. The disassembly and assembly force of the positioning pin is large, which will scratch the mating surface and is an undetachable connection. When the interference is small or the use of hydraulic disassembly, the connection is also removable.
Locating pin applicable occasions:
The positioning pin is suitable for positioning and can also be used for connection. Different matching requirements can be selected, and different diameters have different tolerance requirements; the pin hole needs to be hinged, and repeated disassembly and assembly will reduce the positioning accuracy and connection tightness of the pin, which can only be used to transmit smaller loads. The internal thread of the internal thread positioning pin is easy to disassemble and assemble. The positioning accuracy of the threaded positioning pin is relatively low, and it is mostly used in occasions where the accuracy requirement is not high.
The elastic pin is elastic. After the pin hole, it is close to the hole wall and is not easy to loosen. Low pinhole accuracy. It is suitable for occasions with impact and vibration, and can replace some cotter pins, positioning pins, pins or tapered pins. The hole pin and Pin shaft can be locked with another cotter pin, easy to remove, suitable for hinges.
Key words:
Locating Pin
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