JPH0739617Y2 - Mold equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a mold device for injection molding, and more particularly to a mold device for molding a movable part with a magnet such as a G sensor used in an automobile or the like.

<< Prior Art >> FIG. 3 shows a mold device for molding a movable part with a magnet of a G sensor of a conventional example.

In the figure, reference numerals 1 and 2 denote a pair of left and right mold bodies, respectively, a magnet housing portion 4 for housing a magnet 3 which is a component of a movable portion of the G sensor, a resin molding portion 6 for forming a resin 5, and a magnet. 3 and a housing portion 9 of the insert fitting 7 for connecting the resin 5 to each other. The tip of the insert fitting 7 is bent at a substantially right angle into a key shape and extends to the resin molding portion 6.

The resin 5 is injected from the gate 8 into the resin molding portion 6, and when the molding is completed, the molded resin 5 and the insert fitting 7
And are integrated. Then, the movable portion of the G sensor including the molded resin 5, the insert metal fitting 7, and the magnet 3 is completed.

<Problems to be solved by the invention> However, in such a conventional mold, since the mold body is made of a ferromagnetic steel material, the magnet is attracted to the mold body when the molded product is taken out. Will end up. Therefore, if the molded product is forcibly taken out of the mold main body, the insert fitting is deformed, and a defective product occurs.

The present invention has been made in view of such conventional problems, and an object thereof is to provide a mold device that can be taken out without any trouble when taking out a molded product from a mold body.

<Means for Solving the Problems> In order to achieve the above object, the present invention is a mold device for molding a resin on the other end of an insert fitting having a magnet fixedly mounted on the one end. Includes a pair of mold bodies, and when the pair of mold bodies is closed, holds an intermediate portion of the insert metal fitting between the pair of mold bodies, and one side of the holding portion. In a mold device configured to form a resin-molded cavity on the other side and form a housing part for housing and supporting the magnet on the other side, a mating surface corresponding to the housing part of the mold body. While each of the recesses is formed in each of the housings, each of the housings is formed of a pair of non-magnetic members each having a housing recess at the center, and the housings are formed with the housing recesses facing each other. When it is inserted into the recess of the The magnet is configured to be housed and held, and the magnet is housed and held in the housing through the biasing means. As the biasing means, a means for exerting a suction force through the negative pressure pipe, A pressure spring is used.

Furthermore, the magnet of the insert metal fitting is used for the vacuum suction force inside the housing,
It is characterized in that it is held via a biasing means such as a spring force.

<Operation> In the mold apparatus of the present invention having the above-described structure, when the molded product is taken out from the mold body, the magnet is covered with the non-magnetic material, so that the magnet is attached to the mold body. It can be taken out smoothly without being adsorbed.

Further, since the magnet can be securely fixed and held in the housing portion of the mold body by the biasing means such as vacuum suction force and spring force, strict dimensional accuracy of the magnet and the housing portion is not required.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a vertical sectional view showing a first embodiment of a mold device according to the present invention, and FIG. 2 is a vertical sectional view showing a second embodiment of the mold device. However, the same parts as those of the conventional device are designated by the same reference numerals.

In FIG. 1, reference numerals 1 and 2 denote a pair of left and right injection-molding die bodies which are resin-molded at the other end of an insert metal fitting 7 as a movable part on which one end of a magnet 3 of a G sensor is fixedly mounted. It consists of

The mold bodies 1 and 2 hold the middle part of the insert metal fitting 7 when the mold is closed (the first illustrated state), and the cavity 6 for molding the resin on one side of the holding part A. On the other hand, on the other side, a housing portion 10 is formed in the center portion of the other side, which is composed of housing recesses 10a, 10b for housing and holding the magnet 3. The accommodating portion 10 is made of a non-magnetic material. Then, the mold bodies 1 and 2 corresponding to the housing portion 10
Recesses 1a and 2a are respectively formed on the mating surfaces of. Further, the accommodating portion 10 is such that the accommodating recesses 10a and 10b are opposed to each other, and the accommodating recesses 10a and 10b are inserted into the recesses 1a and 2a of the mold bodies 1 and 2, respectively, and when the molds are closed, the accommodating recesses 10a and 10b are provided. The magnet 3 is housed and held. For this reason, this nonmagnetic container 10
Separates the magnet 3 from the mold bodies 1 and 2, and prevents the magnet 3 from adsorbing to the mold bodies 1 and 2 when the molded product is taken out from the mold bodies 1 and 2 as described later. To do.

One end of an insert metal fitting 7 is fixed to the magnet 3, and the other end of the insert metal fitting 7 is bent into a key shape inside the resin molding portion 6. The resin 5 is injected into the resin molding portion 6 from the gate 8 to integrate the tip of the insert metal fitting 7 and the resin 5.

Further, by bending the tip of the insert metal fitting 7 into a key shape, the insert metal fitting 7 is prevented from coming off from the resin 5 after molding.

Therefore, after the molding work is completed, when taking out the magnetized movable part of the G sensor of the molded product from the mold bodies 1 and 2, a non-magnetic material is provided between the magnet 3 and the inner wall surfaces of the mold bodies 1 and 2. Since the housing portion 10 is arranged, the magnet 3 does not stick to the inner wall surfaces of the mold bodies 1 and 2. As a result, the deformation of the insert metal fitting 7 caused by the attraction of the magnet 3 can be prevented, and the molded product can be smoothly taken out from the mold bodies 1 and 2.

Further, in this embodiment, the negative pressure pipe 11 is inserted through the non-magnetic material containing portion 10 and the mold bodies 1 and 2, and the negative pressure is applied to the upper surface of the magnet 3 by the solenoid valve 12 and the limit switch 13. Is applied so that the magnet 3 can be reliably held at the proper position of the housing portion 10.

Therefore, even if there is a dimensional error between the magnet 3 and the accommodating portion 10, since the magnet 3 is urged by the vacuum suction force as described above, these dimensional errors can be effectively absorbed and the dimensional error can be absorbed. There is an advantage that the magnet 3 can be prevented from being damaged due to, and the size can be easily controlled.

The vacuum suction force acts on the magnet 3 through the negative pressure pipe 11 when the mold bodies 1 and 2 are closed, and the vacuum suction force is released when the molding is completed. By opening and closing.

Next, FIG. 2 shows a second embodiment of the mold apparatus according to the present invention, in which a pressing spring is used as a biasing means for the magnet 3.

That is, by the pressing spring 14 installed in the housing portion 10,
Since the magnet 3 is held at the proper position in the housing 10, the dimensions of the housing 10 and the magnet 3 can be easily managed as in the first embodiment. Reference numeral 15 in the figure is a slide type that contacts the magnet 3 and transmits the spring force of the pressing spring 14 to the magnet 3.

<< Advantages of the Invention >> As described above, according to the present invention, since the housing portion of the mold body that houses the magnet is formed of a non-magnetic material, the magnet is used when the molded product is taken out from the mold body. It can be taken out smoothly without sticking to the mold body.

Therefore, it is possible to effectively solve the problem that the magnet is attracted to the mold body and the insert fitting is deformed, which improves productivity and improves the accuracy of molded products such as G sensors. This has the effect of contributing to the stabilization of quality.

Further, according to the present invention, the magnet is securely held and fixed at an appropriate position in the accommodating portion by the biasing means such as vacuum suction force and spring force. Has the effect that the size error of the magnet can be tolerated, the size of the magnet and the housing part can be easily controlled, and the magnet is not damaged due to the precise size accuracy required in the past. .

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of a mold apparatus according to the present invention, FIG. 2 is a vertical sectional view showing a second embodiment of the same mold apparatus, and FIG. 3 is a conventional mold apparatus. FIG. 1,2 …… Mold body, 1a, 2a …… Recess, 3 …… Magnet, 6 ……
Cavity, 7 ... Insert metal fitting, 10 ... Storage part, 10
a, 10b …… Container recess.

Claims (4)

[Scope of utility model registration request] 1. A mold device for molding a resin on the other end of an insert fitting having a magnet fixed on one end, the mold device comprising a pair of mold bodies, and the pair of mold bodies. When the mold is closed, the intermediate part of the insert fitting is sandwiched between the pair of mold bodies, and a cavity for molding resin is formed on one side of the sandwiched part, while the magnet is formed on the other side. In a mold device configured to form a receiving part for receiving and supporting the receiving part of the mold body, a recess is formed in a mating surface corresponding to the receiving part of the mold body, while the receiving part is formed in the center. Formed of a pair of non-magnetic members each having a housing recess, and each housing is inserted into the recess of each mold body with the housing recesses facing each other, and each housing recess when the mold is closed. It is characterized in that the magnet is housed and held inside Mold apparatus. 2. The magnet of the insert fitting is accommodated and held in the accommodating portion via a biasing means.
Mold device described. 3. The mold apparatus according to claim 2, wherein a suction force is applied to the accommodating portion through a negative pressure pipe so that the magnet of the insert fitting is suction-held in the accommodating portion. 4. The mold apparatus according to claim 2, wherein the magnet of the insert fitting is pressed and held in the housing by installing a pressing spring in the housing.