JPH0713893Y2 - Mold equipment - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a core molding mold apparatus having a concave portion on a side surface particularly in core molding of various casting parts such as automobile parts.

[Prior art]

Generally, in a core molding mold, after molding the core, the upper mold and the lower mold are separated, and the molded core is retained in the lower mold, but the retained core is pushed up from the lower part of the lower mold. A core is molded by a mold by a method of pushing up with a rod and releasing from a lower mold. For example, there is a mold disclosed in Japanese Utility Model Publication No. 63-16531. With this method, it is not possible to release the core if the recess is formed in the core, so it is possible to release the shape without drawing the recess by drawing a perpendicular line from the position corresponding to the bottom of the recess. I am trying. Further, the technology relating to a press die for forming a press product by moving a partial die by a cam driver and a cam slider is described in Japanese Utility Model Publication No. 62-127316 and 127319.
Although it is disclosed in the publication, it has nothing to do with the concave part of the product, and there is no mold device using a cam mechanism.

[Problems that the device is trying to solve]

The above-mentioned conventional technique has the following problems. That is,
The casting product produced by casting using such a core as described above has a problem that extra thickness is formed, resulting in an increase in weight and an increase in material cost.

[The purpose of the device]

The present invention has been made to solve the above-mentioned problems, and devised a mold in which a cam drive is provided in the upper mold and a cam slider mold can be retracted in the lower mold. Further, it is to provide a mold that enables a recess to be formed in a core and a mold that can be manufactured at low cost.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a core molding mold for molding a core in a space formed by an upper mold and a lower mold together with an upper mold and a lower mold.
A cam slider mold having a portion that engages with the cam drive is fitted on the side wall of the lower mold to form the cam slider mold as a partial mold, and a core having a concave portion on the side surface is formed by the upper mold, the lower mold and the cam slider mold. In the mold, the cam drive is provided with a cam slider die pushing cam for engaging the cam slider die with the cam slider during the die matching operation of the upper die and the lower die to move the cam slider die to the molding position. A slider spring is attached to the mold so that when the upper mold and the lower mold are separated, the cam slider mold and the cam drive are separated from each other and the spring force acts so that the cam slider mold returns from the molding position to the retracted position. By retracting and pushing up the core from below the core with a push-up bar, the core can be released from the mold.

[Function of the device]

According to the above-mentioned means of the present invention, the cam drive is attached to the upper die, the cam slider die is attached to the lower die, and the cam drive of the upper die moves and engages the molding die position of the lower die during the die matching operation. Thus, when the upper mold and the lower mold are separated from each other, the cam slider mold is separated from the molded core by the slider spring so that the core can be retracted so as not to interfere with the mold separation.

[Examples of the present invention]

Hereinafter, the details of the present invention will be described with reference to an embodiment shown in the drawings. In FIG. 1, 1 is an upper die, 2 is a lower die, and the upper die is engaged with an elevating part of a casting device (not shown), and the lower die is combined with the upper die and is not shown. It is attached to the base of the casting machine. That is, FIG. 1 is a view showing a state in which the upper die and the lower die are matched with each other, and the cam slider is at the modeling position. A cam drive 3 is attached to the upper mold 1. Further, a cam slider receiver 5 is mounted on the lower mold 2 so as to be flush with the sliding surfaces of the lower mold 2 and the cam slider mold 4, and the cam slider mold 4 is slidably mounted on the cam slider receiver. The cam slider receiver 5 has a rod guide hole.
11, a slider spring receiving rod 6 is inserted into the rod guide hole 11 with the slider spring 7 being attached to a spring bearing formed at one end thereof. A lower male mold 2 is constructed by screwing and fixing a connecting male screw formed on the other end of the slider spring receiving rod 6 to a female screw provided on the cam slider mold 4. FIG. 2 shows a state in which the upper mold 1 is lifted vertically upward and separated from the lower mold 2 by a lifter of a casting device lifting unit not shown in FIG. The operation will be described below with reference to FIG. When the upper die 1 starts to move upward, the cam drive 3 is separated from the cam slider die 4, and a force is applied to the cam slider die 4 by the slider spring 7 via the slider spring receiving rod 6 to the left in the figure. The core 9 thus shaped by retracting the cam slider mold 4 by the separating spring force pushes up the push-up rod 8 from below the casting device (not shown) to lift the core even if there is a recess in the push-up core. Type is possible. Since the initial force may be insufficient due to the fixed state of the cam slider mold 4 and the core 9 after molding, in this case, the cam drive 3 is a push cam as shown in FIG. 2 as another embodiment. In addition to this, a separating cam is formed, and the separating cam gives an initial force in the separating direction (to the left in the drawing) to reinforce the separating force between the cam slider mold 4 and the core 9 when the fixing state is strong to facilitate separation. It's done. As described in detail above, according to another embodiment, the push-in cam and the pull-off cam are formed integrally with the cam drive, so that the full-stroke cam drive is effectively operated for push-in, and the pull-off cam exerts the pull-off initial force for pull-off. The effect that the initial force of the slider spring is deficiently assisted to enable smooth separation.

[Effect of device]

A cam drive is attached to the upper die, and a cam slider die that engages with the cam drive is provided in the lower die.
Since it can be retracted by the spring, it is possible to make a recess in the core and make a cast product with no excess thickness and at a low cost,
The mold structure is simple, the mold manufacturing cost is low, the casting workability is good, and the core having the concave portion on the side surface can be effectively modeled.

[Brief description of drawings]

FIG. 1 is a side view including a partial cross-sectional view showing an embodiment of the present invention and is a view showing a modeling state. FIG. 2 is a view for explaining the operation in the present invention, and is a view showing a state in which the upper mold and the lower mold after core molding are separated and the core is removed. Fig. 1 1 …… Upper mold 2 …… Lower mold 3 …… Cam drive 4 …… Cam slider mold 5 …… Cam slider receiver 6 …… Slider spring bearing rod 7 …… Slider spring 8 …… Upper rod 9 …… Core 10 …… Recessed part 11 …… Rod guide hole Fig.2 a …… Pushing cam b …… Pulling apart cam c …… Retracted position d …… Cam drive engaging part

Claims (2)

[Scope of utility model registration request] 1. A core molding mold for molding a core in a space formed by an upper mold and a lower mold together with a lower mold, wherein a cam drive is provided on the upper mold and a cam drive is provided on a side wall of the lower mold. A cam slider mold having a portion that engages with the cam slider mold is formed as a partial mold, and a core having a concave portion on the side surface is formed by the upper mold, the lower mold, and the cam slider mold. The upper and lower dies are provided on the cam slider dies so that the cam drive engages with the cam slider dies and moves the cam slider dies to the molding position when the upper die and the lower die are aligned. When a mold separation operation is performed, the cam slider mold and the cam drive separate from each other, and a slider spring is attached so that the spring force acts so that the cam slider mold returns from the molding position to the retracted position. Retracted by the roots, the core of the pushing up it by pushing rod from the lower side of the tang, the mold apparatus, characterized in that allowed the core release. 2. The mold apparatus according to claim 1, wherein the cam drive is provided with a cam slider-type separating cam for compensating for the insufficient initial separation force of the slider spring.