JP5336976B2 - Injection mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection molding mold for molding such a molded article that a complicated under-cut part exists on the inner surface such as a rear cowl of an auto two-wheeler, the mold allowing equipment to be simplified and preventing the operation of under-cut processing from being complicated. <P>SOLUTION: The injection molding mold used when injection-molding the molded article includes: a first direct pushing core 5 which constrains the inner surface of left and right one side edge of a molded article W and can move in the mold clamping direction; a first oblique core 6 which constrains the inner surface of left and right other side edge and can move in an oblique direction with respect to the mold clamping direction; and a second direct pushing core 7 which constrains the inner surface of a tail part Wt of the molded particle W and can move in the mold clamping direction, wherein a slide core 7s which can move in the horizontal direction together with the molding article W is disposed on the second direct pushing core 7. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an injection mold for molding a product having an undercut portion.

  Conventionally, when a product such as a rear cowl of a motorcycle is molded with an injection mold, there is a complicated undercut portion on the inner surface of the molded product. Constrained by the inner slide core and the central core movable in the mold opening direction, and one side of the inner surface in the front-rear direction of the molded product is constrained by the inclined core, and after the central core is lowered at the stage of mold opening, the slide core There is known a technique in which an undercut process is performed by sliding the inwardly and pushing it up obliquely with respect to the mold opening direction with an inclined core. (For example, see Patent Documents 1 and 2.)

JP 2001-138370 A JP 2002-321259 A

  However, in the case of the above technology, three cores are required to constrain the inner surface in the width direction of the molded product, which complicates the operation of the core for processing undercuts and the equipment. There was a problem to do.

  Accordingly, the present invention is intended to simplify equipment and to make the operation of undercut processing complicated in a mold for molding a molded product having a complicated undercut portion on the inner surface, such as a rear cowl of a motorcycle. The purpose is not to become.

  In order to achieve the above-mentioned object, the present invention, when injection molding a molded product, constrains the inner surface of the molded product and moves at least two direct-pressing cores movable in the clamping direction, and in an oblique direction with respect to the clamping direction. An injection mold having one movable inclined core is used. The left and right inner surfaces of the molded product are constrained by the one inclined core and one direct pressing core, and the remaining one direct pressing core The direct pressing core that restrains the inner surface on one side in the front-rear direction and restrains the inner surface on one side in the front-rear direction of this molded product is not only in the mold clamping direction but also in the direction orthogonal to the mold clamping direction. Made it movable.

  And, for the undercut part formed on the inner surface in the left-right direction of the molded product, one direct-pressing core and one inclined core are made to correspond, and the undercut formed on one inner surface in the front-rear direction of the molded product The cutting part is made to correspond to the remaining one direct-pressing core, and when undercut processing is performed, for example, by first operating two direct-pressing cores and one oblique pressing core simultaneously to extrude the molded product The undercut part on the inclined core side corresponding to the undercut part on one side of the inner surface in the left-right direction of the molded product is processed, and then the direct pressing core located on the one undercut part in the front-rear direction of the molded product is processed. By moving in a direction orthogonal to the mold opening direction, the undercut portion on the remaining one side in the left-right direction of the molded product is processed.

By doing so, only the undercut portion on one side in the front-rear direction of the molded product is engaged with the direct-pressing core at the corresponding position, so that it is engaged when the molded product is removed from the mold. It can be taken out while processing only one undercut part.
At this time, the structure of the mold is simple and the undercut processing procedure is also simple.

The core that constrains the inner surface in the width direction of the molded product may be two cores, one direct-pressing core and one inclined core, which simplifies the mold structure and facilitates the operation of undercut processing. Become.

It is a perspective view which shows the shape of a molded article. It is a top view which shows each core of an injection mold. It is explanatory drawing which shows a state when shape | molding a molded article, (a) is a top view for demonstrating the state of a core, (b) is a longitudinal cross-sectional view of a metal mold | die. It is explanatory drawing which shows the state which the outer slide core slid right and left after completion | finish of shaping | molding and the upper mold | type rose, (a) is a top view for demonstrating the state of a core, (b) is a metal mold | die. It is a longitudinal cross-sectional view. It is explanatory drawing which shows the state which the direct push core and the inclination core raised, (a) is a top view for demonstrating the state of a core, (b) is a longitudinal cross-sectional view of a metal mold | die. It is explanatory drawing which shows the state which the direct pressing core raised further, (a) is a top view for demonstrating the state of a core, (b) is a longitudinal cross-sectional view of a metal mold | die. It is explanatory drawing which shows the state which the molded article moved sideways by the direct pressing core of a tail part sliding to a horizontal direction, (a) is a top view for demonstrating the state of a core, (b) is a metal mold | die. FIG. It is a side view for demonstrating the direct press core of a tail part. It is explanatory drawing for demonstrating the mechanism in which the direct press core of a tail part slides to a horizontal direction. It is explanatory drawing of the state which takes out a molded article finally.

  The injection mold according to the present invention is a mold for molding a molded product having a complicated undercut portion on the inner surface, and at the same time simplifies the equipment and does not complicate the operation of the undercut process. It is comprised as a metal mold | die, for example, is comprised as a metal mold | die suitable for shape | molding molded articles like the rear cowl of a motorcycle.

  That is, as shown in FIG. 1, the shape of the rear cowl is such that the lower surface side is opened in a substantially U shape, and the lower surface portions of the side surface portions Ws and the lower surface portion of the tail portion Wt are projected inward. The undercut portion u is formed at the time of molding, and the amount of protrusion to the inside of the undercut portion u is small at a portion near the tail portion Wt, and a portion at a portion away from the tail portion Wt is greatly projected. Yes.

  An injection mold for molding such a molded product W includes an upper mold 3 that is movable up and down with respect to the lower mold 2 and left and right outer surfaces of the molded product W, as shown in FIGS. And a pair of left and right outer slide cores 4a and 4b that are slidable left and right, and an inner surface on one side of the left and right sides of the molded product W, and are movable in the mold opening direction by a lifting mechanism described later. The direct-inclined core 5, the first inclined core 6 that restrains the inner surfaces of the left and right sides of the molded product W and can be moved in the tilted direction with respect to the mold opening direction by another lifting mechanism described later, A second direct-pressing core 7 is provided which restrains the inner surface on the tail portion Wt side and can be moved in the mold opening direction by an elevating mechanism. The second direct-pressing core 7 and the left and right inner surfaces of the molded product W are provided. The inclination angle is small between the first direct-pressing core 5 and the first inclined core 6 that restrain the Right pair of second inclined core 8a, 8b are provided.

  And these 2nd inclination cores 8a and 8b are arrange | positioned in the part with little overhang | projection amount of the undercut part u of the molded article W, and raise both inclination cores 8a and 8b simultaneously. Thus, both of the undercut portions u can be avoided, but the inside of the undercut portion u is located at the place where the first direct-pressing core 6 and the first inclined core 6 are disposed. Because the amount of overhang is large, when both the left and right cores are inclined, the undercut portion u cannot be avoided even when both cores rise and there is no gap between the cores. .

  The first direct-pressing core 5 and the second direct-pressing core 7 are attached to a first pushing plate 12 as shown in FIGS. 3B and 8 via pushing pins 10 and 11, respectively. The molded product W can be pushed upward by raising the extrusion plate 12.

  In addition, the first inclined core 6 and the second inclined cores 8a and 8b are connected to each other through the respective inclined pins (the first inclined pin is a reference number 13 and the second inclined pin is not shown). It is attached to the 2nd extrusion board 14 as shown to (b), and the attachment part to the extrusion board 14 of each inclination pin 13 is made to be slidable in the horizontal direction by the slide mechanism 14s, and lower mold | type A stopper member 15 that restricts the raised position of the second pusher plate 14 is provided on the lower surface of 2 so as to protrude downward.

As shown in FIGS. 8 and 9, the second direct-pressing core 7 is divided into a core base 7 d and a slide core 7 s in the vertical direction, and the slide core 7 s is operated by the operation of the cylinder unit 16. It is slidable horizontally and horizontally on the core base 7d.

The molding method in the above injection mold will be described.
First, as shown in FIG. 3, all molds and cores are clamped and a molding material is injected into the cavity to form a molded product W.

  When the molded product W is molded, as shown in FIG. 4B, the upper mold 3 is raised, and then the outer slide cores 4a and 4b slide to the left and right to release the constraint on the outer surface of the molded product W.

Next, as shown in FIG. 5, the first extruded plate 12 and the second extruded plate 14 are raised by the first stroke. This stroke is a stroke until the second extruded plate 14 comes into contact with the stopper member 15.
Then, the 1st inclination core 6 and the 2nd inclination core 8a, 8b each move inside, and will remove | separate from the undercut part u simultaneously with releasing the restraint of the inner surface of the molded article W. (The illustration of the relationship between the second inclined cores 8a and 8b and the undercut portion u is omitted.)

Next, as shown in FIG. 6, even if the molded product W is moved in the horizontal direction by further raising the first extruded plate 12, the molded product W and the inclined cores 6, 8a, 8b interfere with each other. Lift the molded product to a position where it will not.
In this state, the undercut portion u of the molded product W is in a state of being engaged with the first direct-pressing core 5 and the second direct-pressing core 7.

  Next, the cylinder unit 16 of the second direct-pressing core 7 is operated, and the molded product W is slid sideways as shown in FIG. Then, as shown in FIG. 7, the molded product W is detached from the first direct-pressing core 5, and the first direct-pressing core 5 and the undercut portion u of the molded product W are detached.

  The undercut portion u of the molded product W at this time is separated from the left and right undercut portion u, but is engaged only with the second direct-pressing core 7 (7s) of the front and rear tail portion Wt. (A state as shown in FIG. 8).

  For this reason, when taking out the molded product W with the vacuum cup 17 or the like at the final stage, as shown in FIG.

  According to the above procedure, it is possible to prevent the mold structure from becoming complicated, and to simplify the removal procedure.

In addition, this invention is not limited to the above embodiments. What has substantially the same configuration as the matters described in the claims of the present invention and exhibits the same operational effects belongs to the technical scope of the present invention.
For example, the second inclined cores 8a and 8b are not essential constituent elements of the present invention.

  In particular, it is possible to simplify the equipment configuration and to simplify the procedure for taking out the molded product when injection molding a molded product with a complicated undercut on the inner surface of the molded product. Be expected.

5 ... 1st direct-press core, 6 ... 1st inclination core, 7 ... 2nd direct-press core, 7s ... Slide core, W ... Molded article, Wt ... Tail part, u ... Undercut part.

Claims (1)

When injection molding a molded product, the inner surface of the molded product is restrained and at least first and second direct pressing cores movable in the clamping direction, and one movable in an oblique direction with respect to the clamping direction An injection mold having an inclined core, wherein the molded product has an undercut in at least three directions, and the first direct-pressing core and the inclined as an inner mold in two opposing undercuts, respectively. The core corresponds, and the second direct-pressing core corresponds to the remaining one-way undercut, and each of the first and second direct-pressing cores engages with the undercut, thereby forming the molded product. is movable while holding the, also, the second direct pipe pushing core, not the mold clamping direction only, the two opposing directions undercut direction to restrain one side of the inner surface of the front-rear direction of the molded article Also Injection mold, characterized in that it is made rotatably.