JPH06262642A - Mold of injection molder - Google Patents

Abstract

PURPOSE:To surely hold an insert and, at the same time, simplify the installation of the insert and the unloading of a molded article. CONSTITUTION:In the fitment of an injection molder for molding a molded article by injecting resin from a fixed mold 4 under the condition that a magnetic body insert, some part of which extends beyond the molded article, is fixed to a movable mold 5, a through hole 1a is bored in the extended part 1b of the insert 1 and, in addition, a magnetic body 2 for fixing the insert 1 by attraction is imbedded at the position, which corresponds to the through hole 1a of the insert, on the mating surface 9 of the movable mold 5, so as to protrusively provide a guide pin 3, which can insert in the through hole 1a, in the magnetic body 2. At the same time, a recessed part, into which the guide pin 3 can be inserted, is formed on the matting surface 10 of the fixed mold 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for an injection molding machine using an insert for forming a protrusion from a molded product.

[0002]

2. Description of the Related Art A method for manufacturing a molded article in which an insert is embedded by an injection molding machine is disclosed in Japanese Patent Laid-Open No. 61-27392.
No. 0, etc.

An outline of the method described in the above publication is shown in FIG.
Explained by. In injection molding a molded product in which a part of the embedded insert 11 protrudes from the molding surface,
The dividable core 12 made of a magnetic material is fitted to the protruding portion of the insert 11, and the core 1 is placed at an appropriate position on the wall surface of the fixed mold 32 and the movable mold 31 constituting the cavity 30.
2 is provided with a concave portion 14 into which the magnet 15 is fixed, and the concave portion 14 has a magnet 15 fixed therein.
2 is inserted into the magnet 15 and attracted to the magnet 15, and the insert 11 is fixed to the wall surface of the movable mold 31 via the insert core 12, and then a resin is injected into the cavity 30 of the movable mold 31 to form a molded product. To do. Then, the mold is removed and the insert core 12 is taken out together with the molded product, and the insert core 12 is removed from the insert 11 to obtain a molded product in which a part of the insert 11 projects from the molding surface.

[0004]

As described above, the mold of the conventional injection molding machine has a structure in which the movable mold is fitted with the divisible core made of a magnetic material. Therefore, the mounting of the insert is troublesome, and the removal from the molded product is not easy.

Therefore, the present invention is intended to provide a mold for an injection molding machine which eliminates such inconvenience.

[0006]

According to the present invention, a movable metal mold is fixed with an insert made of a magnetic material such as metal, a part of which protrudes from the molded product, and a resin is injected from the fixed metal mold to form a molded product. In the mold of the mold of the injection molding machine, a through hole is formed in the protruding portion of the insert, and a magnetic body such as a magnet is embedded in a position corresponding to the through hole on the contact surface of the movable mold, A guide pin that can be inserted into the through hole is provided on the magnetic body, and a recess into which the guide pin can be inserted is formed on the contact surface of the fixed mold.

[0007]

[Function] A through hole is formed in the protrusion of the insert made of a magnetic material. A guide pin protruding from a magnetic material such as a magnet embedded in the contact surface of the movable mold is inserted into the through hole to set the insert. The insert is adsorbed by the magnetic body embedded in the guide pin and closely adheres to the magnetic body, and its movement is prohibited. On the other hand, the contact surface of the fixed mold is formed with a recess into which the guide pin can be inserted. Therefore,
The insert is closed with the fixed mold due to the vibration during the movement of the movable mold, and the guide pin is inserted into the recess of the fixed mold, and the resin is injected while the insert is firmly sandwiched. Is done.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of one embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall cross section of a mold of a molding machine, and FIG. 2 is an enlarged cross sectional view showing a fixing portion of an insert. 1 is an insert made of a magnetic material such as metal,
It has a protruding portion 1b protruding from both ends of the molded product.
The projecting portion 1b is provided with a through hole 1a into which a guide pin 3 described later can be inserted. 4 is a fixed mold,
A resin spool hole 7 is formed in the center of the contact surface 10 so as to penetrate the fixed mold. Further, the contact surface 10 of the fixed mold 4 is provided with a concave portion 4a into which the guide pin 3 can be inserted, and the convex portion 8 having a size corresponding to the resin thickness of the insert 1 is formed.
Projectingly contacts with a magnetic body portion 2 which will be described later and is embedded in the contact surface 9 of the movable mold 5. Reference numeral 5 is a movable mold 1 which is in close contact with the fixed mold 5. Reference numeral 2 denotes a magnetic body such as a magnet, which is embedded in the movable mold 5 so as to be in close contact with the insert 1 while protruding from the contact surface 9 of the movable mold 5 by the thickness of the resin-formed product. Further, a taper-shaped guide pin 3 which can be inserted into the through hole 1a is provided at a position corresponding to the through hole 1a formed in the protruding portion of the insert 1 on the magnetic body 2. The number of guide pins 3 can be arbitrarily selected, and the size of the protrusion of the contact surface 9 of the magnetic body 2 varies depending on the size of the molded resin product.

Next, regarding the operation and effect of this embodiment,
This will be described with reference to FIGS. 3 and 4. FIG. 3 shows a state where the movable mold 5 is opened, and the guide pin 3 is inserted into the through hole 1a of the insert 1 as shown by the arrow. The insert 1 made of this magnetic material is adsorbed by the magnetic material 2 such as a magnet, and is in close contact with the magnetic material 5 as shown in FIG. Therefore, even if the movable mold 5 is moved in the direction of the fixed mold 4 as shown by an arrow in FIG. 4 by a movable device (not shown), the insert 1 is displaced due to the vibration of the movable mold 5 during the movement. There is no. Then, after the fixed mold 4 and the movable mold 5 come into close contact with each other, the resin is injected from the spool hole 7. After that, the molds 4 and 5 are opened and the molded product is removed from the guide pin 3.

As described above, the through hole 1a of the insert 1
By inserting the guide pin 3 protruding from the magnetic body 5 into the insert 1, the insert 1 is adsorbed to the magnetic body 5 and closely adheres thereto, so that the insert 1 can be easily attached and the molded product can be removed.

[0011]

In the mold of the injection molding machine of the present invention, the movable mold is provided with a magnetic body such as a magnet for fixing the insert made of a magnetic body and a guide pin protruding from the magnetic body. Therefore, the insert is fixed to the magnetic body by inserting the guide pin into the through hole, and is not displaced by the vibration of the movable mold. Also,
It is possible to easily mount the insert and remove the molded product.

[Brief description of drawings]

FIG. 1 is an overall sectional view of a mold of an injection molding machine according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of a fixing portion of the mold insert.

FIG. 3 is an explanatory view of the operation of the above embodiment.

FIG. 4 is an explanatory view of the operation of the above embodiment.

FIG. 5 is a cross-sectional view of a mold of a conventional injection molding machine.

[Explanation of symbols]

 1 Insert 1a Insert Through Hole 1b Insert Protrusion 2 Magnetic Material 3 Guide Pin 4a Recess 4 Fixed Mold 5 Movable Mold 9 Movable Mold Contact Surface 10 Fixed Mold Contact Surface

Claims (1)

[Claims] 1. A mold of an injection molding machine, wherein an insert made of a magnetic material such as a metal partially protruding from a molded product is fixed to a movable mold, and a resin is injected from the fixed mold to form a molded product. A through hole is formed in the protruding portion of the insert, a magnetic body such as a magnet is embedded at a position of the contact surface of the movable mold corresponding to the through hole, and the magnetic body can be inserted into the through hole. A mold for an injection molding machine, characterized in that a guide pin is provided in a protruding manner, and a recess into which the guide pin can be inserted is formed on a contact surface of a fixed mold.