Locating pins, parts involved in limiting the degree of freedom of objects, have certain applications in some mechanical motion equipment, mainly used for position determination in two-dimensional space

Locating pin, using the workpiece hole as the positioning reference, is involved in the part that restricts the degree of freedom of the object, and controls the linear movement of the object in the three axial directions of X, Y, and Z, and six free movements around the rotational movement of X, Y, and Z degree. In a mold composed of two or more parts, a pin designed to accurately position two adjacent parts of the mold.

Application

When the machine body is formed by connecting multiple parts, and each part needs to maintain a precise position during processing and assembly, positioning pins should be used for positioning. For example, the split box body is composed of a machine cover and a machine base, and the processing of the bearing holes on it has higher precision requirements. Therefore, in the design, two positioning pins far apart should be set on the split surface to ensure Its processing and assembly accuracy.

Classification and standards

According to its structure, it can be divided into: small positioning pin, fixed positioning pin, replaceable positioning pin and positioning plug.

Small positioning pin.

Fixed positioning pin

Reasonable structure of positioning pin.

In order to maintain the accuracy of the relative position between the two parts after the certificate is installed, cylindrical pins or tapered pins are often used for positioning, so higher requirements for pins and pin holes. For the convenience of processing pin holes and pins, if possible, make the pin holes as through holes as possible, as shown in Figure (a).