JPH0423607Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a forming device for a forming material for sintering.

(Prior Art) In order to obtain a sintered product in a desired shape, it is necessary to mold a molding material such as ceramic powder or metal powder in advance into a shape corresponding to the sintered product. In order to obtain molded products with complex shapes using this molding material, injection molding, which uses a core and injects the molding material into a split mold, has recently become more common. (For example, JP-A-59-
(See Publication No. 152260).

(Problem that the invention attempts to solve) By the way, when molding is performed using a core,
In order to obtain a molded product with a desired shape, it is necessary to firmly support the core in an immovable state in the mold during molding. In particular, since considerably high pressure is required when molding a sintering material, it is important to hold the core firmly.

Also, when opening the mold and taking out the molded product,
Since this molded product is extremely fragile, it is important to prevent the molded product from accidentally falling from the mold in order to prevent damage. Particularly recently, due to automation, it has become common for molded products to be received using robots, etc., but in this case, the mold is opened particularly wide, so the molded products can be safely received by the robot etc. It is important to prevent it from falling accidentally.

Therefore, the object of the present invention is to provide a mold for sintering that can firmly hold the core during molding and also reliably prevent the molded product from falling accidentally after the mold is opened. The purpose of the present invention is to provide a material molding device.

(Means and actions for solving the problems) In order to achieve the above-mentioned object, the present invention has the following configuration. That is, in a molding device for a sintering forming material that includes a split-type mold in which a core is arranged, an ejector pin that is slidably provided in a guide hole formed in the mold and is equipped with an electromagnet; The core metal member is made of a magnetic material, is integrally provided with the core, and is slidably inserted into the guide hole.

With this configuration, during molding,
By energizing the electromagnet, the core metal member, ie, the core, can be held firmly and immovably in a predetermined position by magnetic force. Furthermore, when the mold is opened after molding and the ejector pin is used to extrude the molded product, by energizing the electromagnet, the molded product is attracted to the ejector pin via the core metal member, ensuring that it does not fall accidentally. Prevented. Then, after confirming that the molded product has been reliably received by an automatic machine such as a robot or by a worker, the electromagnet may be demagnetized.

(Example) An example of the present invention will be described below based on the attached drawings.

In FIG. 1, A is a molded product made of a molded material, and in this embodiment, it is a ceramic chamber component that is attached to the top of a piston in a direct injection diesel engine, and the cavity 1 is:
It is formed to open in an undercut shape.

Core B used to obtain the molded product A
As shown in FIG. 2, the core body 2 is comprised of a core body 2 made of a thermofusible resin material such as urea resin, and a core member 3 made of a magnetic material such as iron. This core metal member 3 has a flange portion 3a at an approximately intermediate portion in the axial direction.
A holding part 3b is shaped like a rod and has one end buried in the core body 2 from the flange part 3a.
On the other hand, the other end side of the flange portion 3a is a fitting attachment portion 3c, which will be described later. Of course, the core body 2 has a shape corresponding to the shape of the cavity 1.

The mold C into which the core B is set is constituted by a split mold 4 and 5, which are divided into two parts, as shown in FIG. One of these, split type 4, has
A guide hole 7 is formed to face the other split mold 5 through a cavity 6 formed when the mold is closed, and an ejector pin 8 made of a magnetic material such as iron is slidably fitted into the guide hole 7. It is inserted. This ejector pin 8 is driven forward and backward by a cylinder device (not shown), and is equipped with an electromagnet 9 at its tip. The opening end of the guide hole 7 is a first holding part 7a with a slightly larger diameter into which the fitting attachment part 3c of the core metal member 3 is fitted without play, and the opening end periphery of the guide hole 7 is a second annular recess into which the flange portion 3a of the core metal member 3 is fitted and seated without rattling;
It is considered as the holding part 7b. In the other split mold 5, a molding material supply port 10 connected to the cavity 6 is formed. Although not shown in the drawings, power is supplied to the electromagnet 9 via a wire disposed through the ejector pin 8.

Next, the operation of the above configuration will be explained.

First, as shown in FIG. 4, the core B shown in FIG. 2 is set in one of the split molds 4 of the opened mold C. During this setting, the fitting attachment part 3c of the cored metal member 3 is fitted into the first holding part 7a of the guide hole 7, and the flange part 3a of the cored metal member 3 is fitted into the first holding part 7a of the guide hole 7.
is fitted into the second holding portion 7b of the guide hole 7. In this state, the tip of the ejector pin 8 is connected to the core member 3.
By energizing the electromagnet 9, the core B is firmly held by the magnetic force.

Next, as shown in FIG. 5, after the mold is closed, the molding material (ceramic powder in the embodiment) is screw fed through the supply port 10 to form the molded article A. At this time, since the electromagnet 9 is energized, the core B does not move even when receiving the supply pressure of the molding material, and is molded into the desired shape with high precision.

After molding the molded product A, the mold is opened as shown in FIG. 6, and the molded product A is pushed out by the ejector pin 8. During this extrusion, since the electromagnet 9 is energized, the molded product A is attracted to the ejector pin 8 via the core B (the metal core member 3 of the molded product A), thereby preventing it from accidentally falling off. Then, for example, the robot's hand 11 approaches the extruded molded product A and grips it. Then, after it is confirmed that the hand 11 is holding the molded product A, the electromagnet 9 is demagnetized, and the molded product A can be moved by the hand 11. Furthermore, hand 11
It is also possible to provide a touch sensor for checking the grip, and to demagnetize the electromagnet 9 when the touch sensor is activated. Of course, the molded product A may be received by the operator, and in this case, the electromagnet 9 may be demagnetized by the operator's manual operation.

(Effects of the invention) As is clear from the above, the invention has the following effects:
By firmly holding the core in the mold so that it does not move during molding, a molded product having a desired shape can be molded from the sintering molding material with high precision.

Furthermore, it is possible to reliably prevent the obtained molded product from being accidentally dropped during removal from the mold, and to reliably prevent damage to the molded product, which is fragile and susceptible to external forces.

Furthermore, since the core is held in the mold using magnets, it can be mounted in any orientation without the problem of the core falling, and as a result, the entire molding device The degree of freedom in design can be increased.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a molded product formed according to the present invention. FIG. 2 is a sectional view showing the core used to obtain the molded product shown in FIG. 1 together with its core member. FIG. 3 is a sectional view showing a mold used to obtain the molded product shown in FIG. 1. 4 to 6 are cross-sectional views showing the molding process of the molded product shown in FIG. 1. A... Molded product, B... Core, C... Molding mold, 2
... Core body, 3 ... Core metal member, 4, 5 ... Split type, 7 ... Guide hole, 7a, 7b ... Holding part, 8
...Ejecta pin, 9...Electromagnet.

Claims (1)

[Claims for Utility Model Registration] A molding device for a sintering material having a split-type mold in which a core is arranged, wherein an electromagnet is slidably provided in a guide hole formed in the mold. A sintering method characterized by comprising: an ejector pin comprising: a core member made of a magnetic material, integrally provided with the core, and slidably inserted into the guide hole. Molding equipment for molding materials.