Manufacturing method and forming tool of high-precision resistor body for multi-circle angular displacement potentiometer

Abstract

The invention discloses a manufacturing method of a high-precision resistor for a multi-circle angular displacement potentiometer. The manufacturing method comprises the following steps: manufacturing a resistance tape: arranging conductive plastic and electrodes on a polyimide film to form the resistance tape; linear trimming and carving; spiral forming: winding the resistance tape outside a forming tool to form a spiral shape; curing: wrapping the medium-temperature curing adhesive film outside the spiral resistance tape to cure and form the spiral resistance tape; and demolding: disassembling the forming tool to obtain the integral cylindrical resistor body. The invention further discloses a forming tool which comprises two first forming rod bodies, two second forming rod bodies and four positioning pins which are connected with one another, and the two first forming rod bodies and the two second forming rod bodies jointly form a cylinder shape. The service life of the resistor body can reach more than one million weeks, the service life of the resistor body and the service life of the potentiometer adopting the resistor body are remarkably prolonged, and the linear precision of the resistor body is improved; the forming tool can be quickly assembled and disassembled, and the production efficiency can be improved.

Description

technical field [0001] The invention relates to a resistor body for an angular displacement potentiometer, in particular to a manufacturing method and a forming tool for a high-precision resistor body for a multi-turn angular displacement potentiometer, and belongs to the production field of the multi-turn angular displacement potentiometer. Background technique [0002] At present, the angular displacement potentiometer with a rotation angle of less than 360° generally adopts a conductive plastic resistor body, that is, a circular and open-loop conductive plastic mold is placed on the base body, and the brush contacts and slides on the conductive plastic to achieve the purpose of angle detection; The rotation life of the angular displacement potentiometer can reach more than 1 million cycles. However, with the continuous development of the control system, angular displacement potentiometers with an angle greater than 360° need to be used in many occasions. At this time, the...

AI Technical Summary

Problems solved by technology

[0004] The defect of the wire-wound resistor body of the above-mentioned traditional multi-turn angular displacement potentiometer is that: when the brush and the resistor body contact and slide, it is friction between metals, and the service life of the resistor body is relatively low (the life span is generally 50,000 to 100,000 cycles). The wear between the metal and the metal is fast, so no matter how the multi-turn angular displacement potentiometer using the wire-wound resistor body is improved, its life is difficult to reach a higher level; at the same time, the alloy wire of the resistor body is in the sliding direction of the brush. There is a pitch that makes the surface of the resistor body uneven. If the brush moves on such a surface, the service life of the brush will also be reduced; in addition, the pitch of the alloy wire of the resistor body in the sliding direction of the brush will make the corresponding The potentiometer has a resolution, that is, the output signal is a step increase or decrease, so its linear accuracy is difficult to improve

Images