JPH03114679A - Equipment for welding brush for micromotor - Google Patents

Abstract

PURPOSE:To perform welding with excellent precision by using a base material holding and transferring jig to carry base material between both upper and lower electrodes from the side and a brush holding and transferring jig to carry a brush on the upside of the base material to make the base material holding and transferring jig movable vertically and support it on an elastic body. CONSTITUTION:The base material 1 having a rectangular bend is clamped on the base material holding and transferring jig 5 which is lifted so that a specified gap is generated between the rectangular bend of the base material 1 carried between the upper and lower electrodes 3 and 4 and the lower electrode 4 in advance. The base material holding and transferring jig 5 is moved horizontally and the rectangular bend of the base material 1 is carried between the upper and lower electrodes from the side. Meanwhile, the brush is clamped on the brush holding and transferring jig 9 which is moved horizontally and the brush is carried on the upside of the rectangular bend of the base material 1. Further, the rectangular bend of the base material is pushed down and made parallel to the brush and welding is performed by pressurizing and energizing of the upper and lower electrodes. By this method, the comb-line shaped brush can be stably welded with excellent accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a welding device for micromotor brushes.

(Prior art) Conventionally, brushes for micromotors are made by press-forming a composite clad material made of a copper-based alloy material with spring properties into which precious metal materials are inlay-bonded into a comb-like shape.
This comb-like brush is welded to a base material such as brass and then incorporated into a mold.

(Problem to be solved by the invention) By the way, the work of welding the above-mentioned comb-like brush to a base material such as brass is automated in consideration of productivity and quality stabilization, but the following There was a problem.

In other words, the material carried between the upper and lower electrodes by an automatic machine is
As shown in the figure, in order to resistance weld the comb-shaped brush 2 to the right-angled bent portion 1a of the base material 1, only the right-angled bent portion 1a is shown in FIG. As shown in the figure, when it is carried between the upper and lower electrodes 3 and 4, there are variations in processing accuracy such as warpage and bending in the right-angled bent portion 1a, so it may come into contact with the lower electrode 4 and be damaged. For this reason, a gap G was provided between the right-angled bent portion 1a of the base material 1 carried between the upper and lower electrodes 3.4 and the lower electrode 4 as shown in the figure.

Because of this gap G, when the comb-like brush 2 is resistance welded to the right-angled bent part 1a of the base material I by applying pressure and electricity to the upper electrode 3, the right-angled bent part 1a of the base material l, which has no elasticity, will be As shown in the figure, the comb-shaped brush 2 is bent and deformed, and the welding strength of the comb-shaped brush 2 is low and the variation becomes large, making it unstable.
When used in a micromotor, there was a problem in that the comb-shaped brush 2 came into contact with the commutator at an angle.

Therefore, the present invention aims to prevent the right angle bending part of the base material from deforming even if a gap is provided between the right angle bending part of the base material and the lower electrode. The present invention aims to provide a micromotor brush welding device that can perform stable welding.

(Means for Solving the Problems) In order to solve the above problems, a micromotor brush welding device of the present invention includes both upper and lower electrodes, and a workpiece holder that carries a workpiece from the side between the upper and lower electrodes. In a micromotor brush welding device consisting of a transfer jig and a brush holding and transferring jig that carries the brush onto the upper side of a table between the upper and lower electrodes, the table material holding and transferring jig is It is characterized by being movable in three directions and supported on an elastic body.

(Function) According to the micromotor brush welding device of the present invention configured as described above, a workpiece having a right-angled bending portion is clamped to a workpiece holding and transferring jig, and a The table material holding and transferring jig is raised so that a certain gap is created between the right-angled bent part of the table material and the lower electrode, and in this state, the table material holding and transferring jig is horizontally moved. ''The right-angled bending part of the base material is brought in from the side between the three lower electrodes, the brush is clamped to the brush holding and transferring jig, and the brush holding and transferring jig is moved horizontally to bend the base material at right angles. By carrying the brush to the upper side of the part, when welding by lowering the upper electrode, the brush is pushed down by the upper electrode, and the right-angled bent part of the workpiece is further pushed down together with the workpiece holding and transferring jig, so that the lower part The right-angled bends of the brush and base material are parallel to each other on the electrode, and as a result of being welded by applying pressure to both the upper and lower electrodes,
The right-angled bent portion of the base material is not deformed, and the comb-like brush is accurately and stably welded to the right-angled bent portion of the base material, resulting in a micromotor brush with high welding strength and good quality.

(Embodiment) An embodiment of the micromotor brush welding device of the present invention will be described with reference to FIG. The workpiece holding and transferring jig 5 is inserted into a cylinder 6 so as to be able to move up and down, and the upper part of an elastic body, in this example a spring 8, disposed inside the cylinder 6 is inserted into a recess 7 provided at the bottom. It is paid for. 9
is a brush holding and transferring jig.

An example of manufacturing a micromotor brush using the micromotor brush welding apparatus configured as described above will be described. As shown in FIG. 2a, the jig 5 for holding and transferring the workpiece has a right-angled bent part 1a with a width of 1.5 mm, a height of 2.5 mm, and a thickness of 0.2 mm, and a width of 4 mm, a length of 16 mm, and a thickness of 0.
．． A base material 1 made of 2 mm brass is clamped, and a constant gap G is set between the right-angled bent part 1a of the base material 1 and the lower electrode 4, which is carried in advance between the upper and lower electrodes 3.4, which is 0 in this example. ．．
Jig 5 for holding and transferring the workpiece so that a gap of 5 mm is created.
In this state, the jig 5 for holding and transferring the table material is moved horizontally, and a right-angled bent part 1a of 4' 1 is inserted into the table from the side between the upper and lower electrodes 3.4, as shown in FIG. It was brought in.

On the other hand, as shown in Figure 2C, the thickness is 0.08 mm and the width is 20 m.
m phosphor bronze 11 with a width of 2.5 m at a position 6 mm from the end
m, thickness 3 (A g -P d 30wt%1 in iμm)
The clad material 12 formed by inlay bonding of 0 is pressed to have a width of 1.3 mm and a length of 14 m as shown in Fig. 2 d.
Mark the three tips 2a with a width of 0.2 and a length of 10 mm at m.
．． The brushes 2 are shaped like comb teeth at intervals of 2 mm, and the tips of the brushes 2 are clamped to a brush holding and transferring jig 9 as shown in FIG. 2e, and the brush holding and transferring jig 9 is moved horizontally. As shown in FIG. 2f, the upper electrode 3.
The brush 2 is lowered, and the right-angled bent portion 1a of the base material 1 is pushed down together with the jig 5 for retaining and transferring the base material against the spring 8, and as shown in FIG. The brush 2 and the right-angled bent portion 1a of the base material 1 were brought into a parallel state, and resistance welding was performed by applying pressure to both the upper and lower electrodes 3.4. the result,
The right-angled bent portion 1a of the base material 1 is not deformed, and the comb-shaped brush 2
could be accurately and stably welded to the right-angled bent portion 1a of the base material 1, and a micromotor brush with high welding strength and good quality was obtained.

In the above embodiment, the comb-shaped brush 2 bends downward during welding due to the lowering of the upper electrode 3 because the brush holding and transferring jig 9 is fixed, but since it has elasticity, it does not deform. After welding, the two-part electrode 3 rises, and the jig 5 for holding and transporting the workpiece returns to its upward position due to the spring, so that the comb-shaped brush 2 rises together with the workpiece l.

The brush holding and transferring jig 9 is designed so that it descends when the comb-like brush 2 is pushed down by the lowering of the upper electrode 3, and rises when the electrode 3 partially rises. As shown, the brush holding and transferring jig 9 is inserted into the cylinder 12 so as to be movable up and down, and is supported on a spring 13 disposed at the bottom of the cylinder 12, and a suppressing device that presses the brush holding and transferring jig 9. 1
4 may be provided on the side surface of the upper electrode 3. In this way, the comb-shaped brush 2 does not bend during welding.

Furthermore, the jig 5 for holding and transferring the workpiece is lowered by pushing down the comb-shaped brush 2 and the workpiece l by the upper electrode 3. A push-down pin 15 may be provided so that when the upper electrode 3 pushes down both the brush 2 and the base material 1, the jig 5 for holding and transferring the base material is pushed down at the same time.

(Effects of the Invention) As can be seen from the explanation below, according to the micromotor brush welding device of the present invention, even if a gap is provided between the right-angled bent portion of the base material and the lower electrode, the right angle of the base material The comb-shaped brush can be accurately and stably welded to the right-angled bent part of the base material without deforming the bent part, resulting in a micromotor brush with high welding strength and good quality. be.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the micromotor brush welding device of the present invention, FIGS. 2a to 2g are diagrams showing the manufacturing process of micromotor brushes, and FIGS. A diagram showing another embodiment of the micromotor brush welding device of the invention, FIG. 5 is a diagram showing a base material having a right-angled bent portion, and FIGS. 6 and 7 are a conventional micromotor brush welding device. It is a figure showing the manufacturing process of the brush for micromotors by. 3... Upper electrode, 4... Lower electrode, feeding jig, 6...
... Cylinder, 7 ... Concave portion, 9 ... Brush holding and transfer jig. 5... After holding the base material 8... Spring,

Claims (1)

[Claims] 1) Both upper and lower electrodes, a jig for holding and transporting the base material from the side between the upper and lower electrodes, and a jig for holding and transporting the brush that carries the brush onto the upper side of the base between the upper and lower electrodes. A micromotor brush welding device comprising: a welding device for a micromotor brush, characterized in that the jig for holding and transferring the workpiece is made vertically movable and is supported on an elastic body.