JPS6347231B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a pin-shaped contact piece that is applied to an assembly machine for parts such as connectors.

The target pin-shaped contact pieces are used in connector plugs that come into contact with female contact springs to obtain an electrical connection, and the perspective view in Figure 1 shows a large number of such pin-shaped contact pieces. A connector body is illustrated.

In Fig. 1, 1 is a component housing, and 2 is a contact body (referred to as a pin-type contact piece) with a contact surface treated parallel to the space inside the housing, which is fitted with a jack-side contact spring (not shown) to obtain a contact function. . The rear part 2' of the pin-shaped contact piece forms a terminal part.

The main parts of a parts assembling machine for assembling the pin-shaped contact piece 2 and the molded casing 1 will be explained with reference to the sectional view of FIG. 2.

In the figure, 3 is a through-hole for press-fitting and fixing a pin-shaped contact piece previously provided in the casing 1, and 4 and 6 are fixtures of the assembly machine that feed the long contact piece material from the front of the through-hole 3. The mold, 5, is a mold that is movable in the vertical direction in the figure, and is located between the fixed molds 4 and 6, and 7 and 7' are cut surfaces of the feed material contact piece material 8, which is clear from the above description. The length L from the cut surface 7 to the tip of the material 8 is the desired length of the pin-shaped contact piece 2 (see FIG. 1). 7
The material between and 7' is discarded. The pin-shaped contact piece 2 thus cut is kept in the relative position shown in the drawing, and the casing 1 is moved to the right side, and the pin-shaped contact piece 2 is driven into the casing.

However, the tip of the cut pin-shaped contact piece 2 produces an angular burr or burr 9, which causes galling with the hole surface when driving into the housing through-hole 3. Such a burred end surface appears at the end of the support or receiving surface 11 for the contact piece material of the illustrated fixed mold 6 near the cut surface 7', and is nothing but shear deformation of the relatively soft contact piece material (for example, brass). The occurrence of such burrs on the end face is unavoidable.

The present invention aims to improve the casing assembly process by eliminating galling when driving the pin-shaped contact piece in the above-mentioned component assembling machine.

To achieve this objective, in the present invention, the material of the contact piece of the fixed mold is designed so that the cut surface of the pin-shaped contact piece formed during cutting does not protrude outward from the outer surface of the pin-shaped contact piece in the longitudinal direction. A pin-shaped contact having the step of providing an inclined part on the bearing surface of the pin-shaped contact piece, and forming a recess corresponding to the inclined part on the outer surface of the pin-shaped contact piece behind the cariage-generating part by deformation due to pressure contact with the inclined part. A method for manufacturing a piece is provided.

One embodiment is shown in FIG. 3 and will be described below with reference to the drawings.

FIG. 3 is the same sectional view as the previous figure, but shows the state before the movable mold 5 descends in the direction of the arrow in the figure and the pin-shaped contact piece 2 is driven into the housing following cutting of the material.

Thus, the material bearing surface 11 of the fixed mold 6 for the contact piece material 8 is made one step lower than the conventional surface shown by the dotted line, and a taper 13 is also formed on the surface near the cut surface 7'. Reference numeral 14 in the figure indicates the amount of grinding (forming) to make the mold lower by one step, and the amount of grinding 14 is made larger than the amount of burrs 9 produced during cutting. The taper 13 is tapered so that the contact piece material supplied from the right side does not get stuck. When the contact piece material 8 is supported on the material supporting surface 11 of the fixed mold 6 and cut is performed by the movable mold 5, a tapered surface 13 is formed on the lower surface of the contact piece material 8 near the cutting part. A corresponding recess is formed, and the cut end surface 12 of the pin-shaped contact piece 2 has a shape in which no burrs protrude from the outer surface as shown in the figure, and the pin-shaped contact piece 2 does not have any rips or the like and can be easily assembled by driving into the housing. It can be implemented smoothly.

Although the figure shows only one cross section of the material cutting,
This assembly machine has a large number of cutting sections arranged in the drawing configuration in the front and back corresponding to the number of pin-shaped contact pieces, and is configured to simultaneously cut and press-fit a large number of pins (see FIG. 1).

According to the manufacturing method of the pin-shaped contact piece of the present invention as described above, there is no galling with the pin casing when driving the casing. It has the advantage of being able to perform stable continuous assembly without fear of adversely affecting functionality.

Although the above embodiments illustrate connector assembly,
The present invention can be applied to an assembly process that involves press-fitting terminals, etc., which involves cutting other similar products, and has great effects. From this point of view, the present invention has great practicality.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a connector as a target part to be processed, FIG. 2 is a sectional view showing the main parts of a conventional assembly machine, and FIG. 3 is a sectional view of the main parts of an assembly machine showing an embodiment of the present invention. In the figure, 1 is a component housing, 2 is a pin-shaped contact piece, 3 is a through hole, 4, 5, and 6 are cutting molds of the assembly machine, 8 is a contact piece material, 9 is a burr at the cut end, and 11 is a raw material a bearing surface, and 13 is a tapered surface of 11;

Claims (1)

[Claims] 1. A long contact piece material is supported by a fixed mold, and a pin-shaped contact piece is obtained by cutting it with a cutting (movable) mold, and the pin-shaped contact piece is penetrated. In a component provided with a pin-shaped contact piece that is driven into the through-hole of a component housing having a hole, the burr of the cut surface of the pin-shaped contact piece formed at the time of cutting is in the longitudinal direction of the pin-shaped contact piece. In order to prevent the contact piece material from protruding outward from the outer surface along A method for manufacturing a pin-shaped contact piece, comprising the step of forming a concave portion corresponding to the inclined portion on the outer surface of the pin-shaped contact piece behind the burr-generating portion by deformation due to pressure contact with the burr-generating portion.