來源：http://www.railway-signal.com/ 發布時間：2021-10-11 瀏覽次數：
Positioners are often used in welding production, such as retaining iron, locating pin, V-shaped iron and template. The locating pin and template can be used independently. The retaining iron and V-iron are usually installed on the support of the welding fixture. The positioner installed on the fixture not only plays the role of positioning, but also cooperates with the clamp to bear various forces, such as clamping force, yodong force caused by welding deformation, etc.
1、 Retaining iron
Retaining iron is a positioner with common application and simple structure. The fixed retaining iron is directly welded to the steel support according to the positioning principle. The detachable retaining iron is directly inserted into the conical hole of the support and can be pulled out when not in use. In order to facilitate the loading and unloading of workpieces, there is also a retractable retaining iron.
2、 Locating pin
It is positioned by the contact between the cylindrical surface and the positioning reference hole of the workpiece. In welding production, short locating pins are often used because the degree of workpiece is not large. In addition to being fixed on the fixture, the positioning pin is also designed to be detachable.
3、 V-shaped iron
V-shaped iron is often used to locate cylindrical workpieces with small diameter, such as rod and steel pipe. The remaining dimensions of the notch of V-shaped iron depend on the diameter D of the workpiece. General H = 0.8d
H-H = 0.2d, when Φ= At 90, C = 1.41d-2 (H-H).
Make a template according to the mutual position of each part in advance, and assemble it to make it close to the workpiece for positioning.