JPS6230685B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding die for manufacturing a resin insulator for a capacitor having a lead wire, and more particularly, a molding die for manufacturing a resin insulator for a capacitor having a lead wire, and more specifically, a The present invention relates to a mold for forming an insulator for a capacitor, in which a pin-like member for forming a hole for passing the lead wire is provided in the cavity.

As shown in FIG. 7, in this type of conventional general molding die, the pin-like member 07 is fixed to one die 01, and the other die 02 has a mold clamping member. At times, the pin-like member 07
A recess 02a is formed at the tip of the pin-like member 07 to be fitted into the other mold 02 with an appropriate gap, or as shown in FIG. There are molds in which the pin-like member 07 is fixed to one of the molds 01 in close proximity to each other, but each of these has the following drawbacks.

That is, when the mold is clamped, the pin-like member 07
If the tip of the pin-like member 07 comes into contact with the other mold 02, the pin-like member 07 will be deformed and damaged, which will lead to poor product accuracy. The mold is designed and manufactured so that there is a slight gap between it and the mold 02. Therefore, during injection molding of the molten resin into the cavity 05, the molten resin infiltrates into the gap and appears as a thin film-like burr (molding burr). In the former case, this burr largely protrudes from the outside of the insulator, and in the latter case, although it is flush with the insulator, it is in the form of a thin film, so it tends to peel off in part and protrude to the outside. Even in the case of
When insulators are supplied to the insulator feeding device of an automatic capacitor manufacturing machine, protruding burrs make the feeding and posture of the insulators uncertain, causing a deterioration in product yield. A step of polishing this protruding burr is required. Furthermore,
Along with this polishing, the insulator is charged with static electricity, making it easy for dust to adhere to it. If the insulator is fed as is to the insulator feeding device, the dust that has fallen and accumulated may make feeding unstable or impair product performance. In order to prevent this from deteriorating, a step is also required to clean and remove the adhering dust, which requires a large number of steps to manufacture the insulator as a whole, which has the drawback of increasing the cost of the product.

The present invention has an object to improve the above-mentioned conventional drawbacks.

A characteristic configuration of the molding die according to the present invention, which has been made to achieve such an object, is that the pin-like member is divided into two parts at a position corresponding to the middle of the insertion hole, and these two divided pin parts are connected to the two metal parts. It is attached to each side of the mold, and the functions and effects of this characteristic configuration are as follows.

<Function> In other words, by dividing the pin-like member into two parts at a position corresponding to the middle of the insertion hole, the burr that is generated due to injection of force-melting resin into the cavity is formed in the middle part of the insertion hole. This makes it possible to avoid the occurrence of burrs protruding from the outer surface of the insulator.

<Effects> Therefore, the conventional process of polishing burrs after molding and cleaning and removing adhering dust is no longer necessary, and overall the manufacturing process of the insulator can be kept to a minimum and precision can be improved. It has now become possible to mold products with good quality at an advantageous manufacturing cost.

Hereinafter, embodiments of the configuration of the present invention will be described based on the drawings.

To form a mold for molding an insulator for a capacitor, as shown in FIGS. Pin-like members 7 for forming the insertion holes 6 for the lead wires 3a are provided in the cavity 5 for forming a large number of them in parallel, and these pin-like members 7 are inserted into the insertion holes 6, respectively.
Divide into two at a point corresponding to the middle of ..., and
The split pin portions 7A, 7B, . . . are attached to each of the molds 1, 2.

In addition, convex and concave portions 7a and 7b are formed at opposing ends of the split pin portions 7A and 7B, and these portions 7a and 7b align the split pin portions 7A and 7B by fitting from their axial directions. , protrusion 7
A is formed into a tapered shape.

When molten rubber is injected into the cavity 5, a part of the molten rubber infiltrates between the opposing ends of the split pin portions 7A and 7B, forming a thin film barrier. Since the barrier is formed at the intermediate portion between the insertion holes 6, 6, even if part of the barrier is peeled off, it will not protrude to the outer surface of the insulator 4.

In the above embodiment, the convex split pin portion 7a of the pin-like member 7 was fixed to the female mold 1, and the concave split pin portion 7B was fixed to the male mold 2. As shown in the figure, the convex dividing pin portion 7a is attached to the male mold 2, and the concave dividing pin portion 7B
It may also be carried out by fixing it to the female mold 1.

FIG. 6 shows a molding die for a convex insulator, in which the pin-like members 7, 7 are placed between the insertion holes 6, 6, respectively, and the convex insulator is It is divided into two parts at a point corresponding to the stepped part.

In the case of this embodiment, the convex split pin portion 7A of the pin-like member 7 was fixed to the female mold 1, and the concave split pin portion 7B was fixed to the male mold 2. Place the convex split pin portion 7A into the male mold 1,
In addition, the concave split pin portion 7B may be fixed to the female mold 2.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main parts showing a mold for forming an insulator for a capacitor according to the present invention, FIG. 2 is a perspective view of a molded semi-finished product, and FIG. 3 is a perspective view of a capacitor.
FIG. 4 is a cross-sectional view of the insulator, FIGS. 5 and 6 are cross-sectional views of the main parts showing the molding die of the example, and FIG.
FIG. 8 is a sectional view of a main part of a conventional molding die. 1... Female mold, 2... Male mold, 3... Capacitor, 3a... Lead wire, 4... Resin insulator,
5... Cavity, 6... Insertion hole, 7... Pin-like member, 7A, 7B... Divided pin portion, 7a, 7
b...Uneven portion.

Claims (1)

[Scope of Claims] 1. A hole 6 for inserting the lead wire 3a is formed between the male and female molds 1 and 2 in a cavity 5 for molding the resin insulator 4 of the capacitor 3 having the lead wire 3a. In a mold for forming a capacitor insulator, which is provided with a pin-like member 7 for forming the pin-like member 7, the pin-like member 7 is divided into two parts at a position corresponding to the middle of the insertion hole 6, and these two divided pins Portions 7A and 7B are the two molds 1 and 2.
A mold for forming an insulator for a capacitor, characterized in that the mold is attached to each side of the capacitor. 2. The mold for forming an insulator for a capacitor according to claim 1, wherein the constituent resin of the insulator 4 is rubber. 3. The split pin portions 7A, 7B are provided with centering unevenness 7a, 7b at their opposing ends that can be engaged with and separated from the axial direction. A mold for forming an insulator for a capacitor as described in 2.