SU863998A1 - Method of manufacturing foil resistance strain gauge - Google Patents

Description

(54) METHOD FOR MAKING A FOIL

 - G,

The invention relates to a measurement technique, in particular, to the technology of manufacturing foil resistance strain gages, and can be used to manufacture low-base strain gauges with an increased output power.

A known method of manufacturing a foil strain gauge, consisting in / that the foil of the sensing element is covered with an electrical insulating layer, etched, on the foil the grid pattern and contact pads for the leads and solder the leads to the contact pads ilj,

However, this method is non-technological and does not allow receiving sensors of small dimensions.

The closest in technical essence and the achieved result to the invention is a method of manufacturing a foil. A strain gauge, which consists in covering the foil of the sensing element with a layer of electrical insulation, folding it into a package in a zigzag manner, polymerizing and cutting it into separate strain gauges and , made in the form of narrow strips of foil, soldered after 30 TENSORS

polymerization of the electrical insulating layer G2.

However, this method is also technological, since it involves the operation of manual soldering of the outputs of each strain gauge. ,

The purpose of the invention is to simplify the manufacturing technology.

This goal is achieved by the fact that before applying an insulating layer to the foil, solder the current of the conductive material along the entire width of the strip of solids on both sides, and the insulating layer is applied on one side to the foil of the sensing element and the solder joint zone, and the other side - on the entire surface of the foil and strips.

 FIG. 1 shows a foil preform with inset strips dl. future current leads, in FIG. 2 - the same, with an insulation layer applied on one side, in FIG. 3 - the same, with an insulating layer applied on it from the opposite side, in FIG. 4 is a cross section of a blank with insulating layers; in FIG. 5 is a cross section of the fabricated foam strain gauge.

The method is carried out in the following way.

From a strip of foil, made from a material with the required strain sensitivity, for example, from constantan, cut a rectangular billet. Foil of conductive material. for example, from copper, two strips 2 and 3 are cut, the length of which is equal to the width of strip 1 of the foil of the sensitive element, and they are soldered to the edges of strip 1 of foil with a small overlap. Then, insulating layers 4 and 5 are worn on both sides of the obtained prefab, covering on one side only strips 1 of the foil of the stress-sensitive element and the area of the solder joint,

and on the other hand all the software is completely

the surface of the prefab, as an insulating material, use any kind of polymerization glue 6, for example bakelite, in combination with capacitor paper 7, which serves to hold the adhesive film on a given surface. Then the strip 1 of the foil is folded in a zigzag manner into the bag and the insulating layer is polymerized. After the polymerization is completed, the bag is cut into individual strain gauges.

The use of the proposed method allows to obtain small-scale

strain gages with already subclauses, which significantly reduces the complexity of their manufacture and improves the quality of soldered joints.

Claims (2)

1. USSR Author's Certificate No. 261753, cl. G 01 B 7/18, 1967. 2. USSR author's certificate No. 543282, cl. G 01 B 7/18, 1976 (prototype),. .-; :; i} - ;; : -;,:; fig.Z  E $ S3S SS253S5 S 5S. r;