JPS5846587A - Method of producing slip ring - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention also relates to a method for manufacturing a lip ring. Slip rings, which are generally formed by embedding a molded material, have high electrical connections between the rotating shaft and the stationary side, as well as the slip rings of VTR heads, and have α-sliding characteristics such as lateral vibration, noise characteristics, and wear resistance. The vertical type is often used from above, and recently, as the M type 4, the sliding part 101 of the cylindrical ring body as shown in FIG. However, in the electronic equipment that incorporates this, there are noise characteristics and sliding problems.

Since the characteristics are important, great care has been taken in the contact material and mechanism of the sliding part 101 of the cylindrical ring body. If necessary, the material is clad in a base metal alloy machine, and a flange that curves outward is formed at one end by drawing processing during the sheet metal press, followed by deep drawing processing, and in addition, my father carried out the press punching process of Kodoku. A slip ring is used in which the sliding portion 101 of a cylindrical ring body has a connecting portion curved inwardly at the other end.

In order to reinforce the strength of the sliding part 1010 of the cylindrical ring body and insulate the slip rings from each other, the sliding part 1010 of the cylindrical ring body is
It is necessary to prepare an insulating material 102 made of synthetic resin inside IU1.

Conventionally, this synthetic resin insulating material 102 has been made separately from the cylindrical ring. This is because the cylindrical ring body is Au-Pd-
Pt alloy, Au-Pt alloy, Ag-Cu alloy, A
, a thin precipitation-hardened noble metal plate such as a g-Pd-Cu alloy, or a Cu-Ni noble metal layer.

Since it is composed of a clad material in a base metal alloy such as Fe-Ni, the non-uniform processing strain of the noble metal layer during processing is caused by precipitation hardening due to heating during molding, resulting in slippage. This is because it reduces the dimensional accuracy of the ring and, in turn, deteriorates the dynamic characteristics.

In addition, distortion occurs in the inwardly curved connection part of the circular m-shaped ring body 1 (JIFI), which is formed by deep drawing and punching of a sheet metal having a precipitation hardening noble metal layer, and this distortion causes a gap in the lower die of the special mold for mold forming. This is because the mold resin leaks and adheres to the surface of the connection part of the cylindrical ring body.

The present invention aims to solve these problems in integrally molding a resin mold and a cylindrical ring body.
This method attempts to integrally mold a cylindrical ring and an insulating material by performing precipitation hardening with heat during molding and by preventing mold resin leakage by using a grooved lower mold.

Embodiments of the present invention will be described below based on the drawings.

Ag98%-Cu6%-Cd2% alloy 1 with plate thickness of 0.1cm
Figure 2a is created by deep drawing and punching using a jt press.
A cylindrical ring body l as shown in , bK was manufactured. This cylindrical ring l has a sliding part 101 with a height of 4.2 ws, a collar part 103 with an outer diameter of 8j'+++a curved outward at one end, and an outer diameter 6. 5/w connection 51
04 is formed. This connection part 104 has an inner diameter of 40/
A nearly circular hole w is punched, and 2 y
A tongue-shaped terminal 105 having a size of X 2 m is formed.

This cylindrical ring body 1 has a unique spring property due to the press-forging process, but it has been subjected to the precipitation hardening process. J! This is because the precipitation hardening treatment is performed during the zero-order mold forming special KIW1, which does not require additional fitting.

Next, a method of forming the insulating plate 102 made of synthetic resin on the inner surface of the cylindrical molding body l will be described.

As shown in FIG. 3, the cylindrical ring body 1ti is pressed by an upper die 2 and a lower die 3 for molding. A concave #I is provided on the contact surface 301 of this lower mold 30 with the cylindrical head stop 1, and the remaining convex portion 302 is the connecting portion 104 of the cylindrical ring body l.
A pattern corresponding to is formed.

This pattern formation is performed by chemical etching, mechanical grinding, or the like. Further, in the upper die 2 for molding, a convex portion 2ost having a height of 10 m and a diameter of 2u is formed in order to form a lead wire insertion hole in the insulating plate. Therefore, the upper mold 2 and the lower mold 3 come into contact when pressed.

In addition, four 0.51 W presser pins 202t are provided to prevent the cylindrical ring from floating during injection of mold resin.

When the resin is injected into the inner surface of the cylindrical ring body 1 and solidified while being pressed, a slip ring 4 consisting of the cylindrical ring body 1 and the insulating plate 102 as shown in FIG. 4 is obtained. The molding compound is injected at a temperature of about 250'C and solidifies in 5 minutes. By heat treatment at this time, Ag92s-Cu 6%
-Cd 2To alloy u precipitate 41' L Vickers hardness was 120±10 Hy but could be hardened at 150±3 Hvt. Moreover, no resin adhesion was observed on the sliding surface of this slip ring 4.

As described in detail above, according to the present invention, precipitation hardening by heat treatment can be used, and the precision of the slip can be increased, compared to the conventional structure in which a cylindrical ring body and an insulating plate are formed separately and combined. You can get a ring. Therefore, even if such slip rings are stacked and used in a magnetic head of a VT box, etc., the contact characteristics and characteristics are stabilized and reliability is improved, and there is no occurrence of breakage or support due to plate abrasion powder, etc.

[Brief explanation of drawings]

The drawings show an embodiment of the invention, FIG. 1 a side view of a vertical slip ring assembly and FIG. 2 a cylindrical ring! is a plan view, b is a cross-sectional view, and Figure 3 is a cross-sectional view of the molding die.
Figure 4 is a cross-sectional view of the slip ring. DESCRIPTION OF SYMBOLS 1... Cylindrical ring body, 102... Insulating plate, 2... Upper mold for mold, 3... Lower mold for mold, 302... ...Convex part of the lower mold, 4...
...Slip ring. Tanaka Kikinzoku Kogyo Co., Ltd. Figure 1 Figure 2 (Q) Figure 2 (b) Figure 3 Figure 4

Claims (1)

[Claims] A cylindrical ring body having an outwardly curved collar portion at one end and an inwardly curved IiI continuation portion at the other end is formed by press deep drawing and punching a book having a precipitation hardened precious metal layer. However, in this method of manufacturing a slip ring that integrates a cylindrical ring body and an insulating material, the inner surface of the cylindrical ring body is formed by providing a concave groove corresponding to the connection part of the mold downstream e1vc that comes into contact with the connection part. A method for manufacturing a slip ring, which comprises molding the slip ring with resin.