Spring positioning pin principle, parts
The spring positioning pin, with the workpiece hole as the positioning reference, participates in the part that limits the degree of freedom of the object, controls the linear motion of the article in the three axial directions of X, Y, and Z, and the six freedoms of the rotational motion around X, Y, and Z. Degree of exercise. In a mold composed of two or more parts, a pin designed to accurately position two adjacent portions of the mold.
Second, the principle of the spring positioning pin
The role of the spring locating pin is to limit the freedom of movement of the item.
Linear motion, and rotational motion around X, Y, Z. Degree of freedom: When an object is in space, there must be six degrees of freedom, X, Y, and Z.
In a mold composed of two or more parts, a pin designed to accurately position two adjacent portions of the mold.
Third, the standard of spring positioning pin
Spring positioning pin is a standard part
Cylindrical pin: GB/T119.1-2000 GB/T119.2-2000
Internal threaded cylindrical pin: GB/T120.1-2000 GB/T120.2-2000
Tapered pin: GB/T117-2000
Fourth, the reasonable structure of the spring positioning pin
In order to ensure the accuracy of the relative position between the two parts after the installation, the cylindrical pin or the tapered pin is often used for positioning, so the requirements for the pin and the pin hole are high. In order to facilitate the processing of pin holes and pins, the pin holes are made into through holes as much as possible under possible conditions.
In the spindle positioning, first (1) mechanical cam mechanism (2) photoelectric plate mode for coarse positioning, then a hydraulic or pneumatic spring positioning pin is inserted into the pin hole or pin groove on the spindle to achieve precise positioning, complete the spring after the tool change When the positioning pin exits, the spindle starts to rotate.
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