JPH06106578A - Mold for molding - Google Patents

Abstract

PURPOSE:To preclude an outflow of resin by locating a larger cross-section areal part of the bushing to be arranged on the lead wire in the inside of the mold, and grasping the remaining small cross-section areal bushing part in the separation part of the mold, and even by providing a notched part on a part of the mold contact stepped surface of a larger cross-section areal part. CONSTITUTION:In the bushing 3, turn of resin to the stepped surfaces 33 between them and the large cross-section areal part 32 being a part to be arranged in the inside of the mold and to the notched part 34 is stopped on the inside surfaces of the upper mold 41 and lower mold 42 through an anchor operation. For this reason, even when the molding pressure of resin 5 is large, the bushing 3 is not extruded and, thus, never falls from the mold. Similarly, an outflow of resin 5 never occurs due to such falling as in the prior art mold. Also, with respect to the small cross-section areal part 32 of the bushing 3, grasping by relatively large pressing force is not required, as in a prior art manner, by the upper mold 41 and lower mold 42. Therefore, the bushing 3 is never damaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die. More specifically, a new lead wire arrangement that can effectively prevent resin from leaking from the lead wire portion and damage to the lead wire when molding a lead wire arrangement mold body that is useful for manufacturing a molded motor, etc. The present invention relates to a molding die for molding.

[0002]

2. Description of the Related Art In addition to miniaturization and high performance of electric and electronic parts, molding of functional parts by molding has been widely performed. For example, a wound fixed iron core is left in a state where lead wires are provided. The manufacture of molded and framed molded motors is known. For example, in molding with a lead wire provided, such as this mold motor, of course, the presence of the lead wire causes the molding resin to flow out from the lead wire portion and lead by the molding die. Since there is a possibility of damage to the wire and the like, it is common practice to arrange a bushing at the contact portion between the lead wire and the mold for molding.

FIG. 4 shows an example of a molding die using such a bushing (a), which covers a lead wire (c) drawn from a functional component (a) such as a motor iron core. A) is arranged in the groove between the upper die (D) and the lower die (E) of the molding die and is used for molding.

[0004]

However, in the conventional bushing (a), the resin is injected from the inside of the molding die during molding, and the bushing (a) is easily extruded to the outside. Then, there is a drawback that resin outflow easily occurs. Therefore, an attempt is made to press and hold the bushing (a) more firmly by the upper mold (d) and the lower mold (e), but such means damages the bushing (a) itself and causes a crack. As a result, there is a drawback that the finished appearance is significantly deteriorated.

Therefore, as a simpler operation, the bushing (a) is prevented from extruding and dropping due to the molding pressure and the resin outflow is prevented, and the bushing (a) is damaged due to the increase of the pressing force of the mold. There was also a desire for the development of an improved means without exception. The present invention has been made in view of the circumstances as described above, and eliminates the drawbacks of the conventional molding die using the bushing (a),
It is an object of the present invention to provide a new molding die that is free from resin outflow and is not damaged in a bushing, has a good finished appearance, and is useful for manufacturing a mold motor or the like.

[0006]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems, and is a molding die for a lead wire arranging mold, wherein a bushing arranged on the lead wire is larger than a part thereof. The cross-sectional area portion is located inside the molding die, the remaining small cross-sectional area portion is gripped by the dividing portion of the molding die, and a cutout portion is provided in a part of the die contact step surface of the larger cross-sectional area portion. The present invention provides a molding die characterized by the following.

[0007]

According to the present invention, a part of the bushing having a larger cross-sectional area is located inside the molding die, and the remaining bushing portion having the smaller cross-sectional area is arranged in the mold dividing portion as in the conventional case, and the step Since the resin cut-in portion is formed by the surface cutout portion, the bushing portion with a larger cross-sectional area located inside the mold is caught at the inner end of the upper and lower split parts of the mold, and even if the resin pressure is large. The anchoring action can surely prevent the bushing from falling off.

Therefore, even the conventional upper and lower split molds can be used as they are by using a bushing having a structure in which a part of a large cross-sectional area is arranged inside the molding die. It is not necessary to increase the pressure gripping force between the upper and lower molds. Therefore, the inconvenience as in the case of the conventional molding die does not occur at all. Examples will be shown below to describe the molding die of the present invention in more detail.

[0009]

1 and 2 of the accompanying drawings illustrate a molding die of the present invention. For example, as illustrated in FIG. 1, the molding die of the present invention is a lead wire disposing mold molding die (4) in which a lead wire (2) is connected to a functional component such as a wound motor iron core (1). There is a bushing (3) that covers the lead wire (2).
A part (31) having a larger cross-sectional area is located inside the mold, and the remaining small cross-sectional area part (32) is the upper mold (41) and lower mold (42) of the mold.
The divided portion is gripped by a predetermined groove portion.

Further, a notch portion (34) through which the resin (5) can go around is provided on the die contact step surface of the large cross-sectional area portion (31). As is apparent from FIG. 1, the bushing (3) has a large cross-sectional area portion (31) which is a portion arranged inside the molding die and a cutout portion (3).
Due to the presence of 4), the resin sneaking into the step surface (33) with the small cross-sectional area portion (32) and the notch (34) is anchored to the inner surfaces of the upper mold (41) and the lower mold (42). Since it is locked by the action, even if the molding pressure of the resin (5) is large, the bushing (3) is never extruded from the molding die and fall off. Therefore, there is no outflow of the resin (5) due to this detachment unlike the case of the conventional mold.

Further, it is not necessary to grip the small cross-sectional area portion (32) of the bushing (3) with a larger pressing force by the upper mold (41) and the lower mold (42) as in the conventional case. Therefore, the bushing (3) is not damaged. The bushing (3) may have an appropriate shape in accordance with the required number of lead wires (2) and their arrangement, and may be formed as shown in FIGS. 2 (a) and 2 (b), for example. In each case, the small cross-section area (32)
Are arranged in the groove formed by the upper die (41) and the lower die (42) shown in FIG.

The presence of the step surface (33) and the notch (34) prevents the bushing (3) from falling off as described above and prevents the bushing (3) from being damaged by an excessive pressing force. . The bushing (3) will play the anchor effect. As for the bushing (3), as illustrated in the plan sectional view of FIG. 3, a groove (35) is provided in the small cross-sectional area portion (31), and the groove (35) and a semicircular pin of a mold or the like. It may be further locked by the projection (6).

[0013]

As described in detail above, according to the present invention, in the manufacture of a molded motor or the like, there is no resin outflow due to the dropout of the lead wire bushing or damage to the bushing due to an increase in mold pressure, and the finish is smooth. It becomes possible to perform lead-molding molding with a good appearance.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a mold of the present invention.

2A and 2B are perspective views each illustrating a bushing.

FIG. 3 is a plan sectional view showing another embodiment of the present invention.

FIG. 4 is a side sectional view showing a conventional mold.

[Explanation of symbols]

 1 Motor iron core 2 Lead wire 3 Bushing 31 Large cross-section area part 32 Small cross-section area part 33 Step surface 34 Notch part 35 Groove 4 Molding die 41 Upper die 42 Lower die 5 Resin 6 Protrusion

Claims (1)

[Claims] 1. A molding die for a lead wire arranging mold, wherein a bushing arranged on the lead wire has a part of a larger cross-sectional area portion located inside the molding die, and a remaining small cross-sectional area portion. And a cutout portion is provided in a part of a die contact step surface of a larger cross-sectional area portion while holding the die in a divided portion of the die.