JP2001054914A - Mold apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely equalize heating temperature of a necessary part of the cavity or the whole cavity. SOLUTION: A face heater 4 for heating a cavity 3 is incorporated in cavity components 1 and 2 formed by enclosing the cavity 3 in which a product is molded. The face heater 4 approaches the cavity 3 from a face other than the face of the cavity 3 of the cavity components 1 and 2, and fitted to fitting grooves 12 and 22 dug in along an irregularity of the cavity 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to a technical field related to a molding apparatus for molding a synthetic resin material, a metal material, a ceramic material, and the like into a product inside a heated cavity.

[0002]

2. Description of the Related Art Conventionally, as a molding apparatus, for example, a molding apparatus described in JP-A-5-162138 is known.

In this conventional molding device, a cavity heater for heating a cavity is formed by dividing a cavity constituting member surrounding a cavity in which a product is molded into two, and a heating means is provided on the entire cavity constituting member. It is oriented to be close.

According to this conventional molding apparatus, the heating temperature of the cavity constituting member is made uniform by the planar heater installed in the cavity constituting member, and the time required for heating the cavity constituting member is shortened. However, since there is no cooling device in a portion of the cavity constituent member close to the cavity, the temperature cannot be reduced. Therefore, it is difficult to shorten and control the molding time, and the material used is limited.

[0005]

In the above-mentioned conventional molding apparatus, when the cavity has a complicated and fine uneven structure due to precision molding or the like, and when only a necessary portion of the cavity is heated, the cavity is However, there is a problem that equalization of the heating temperature cannot be sufficiently achieved.

The present invention has been made in view of the above problems, and provides a mold apparatus capable of surely equalizing the heating temperature of a cavity, and further provides cooling of a mold side and a core side. It is an object of the present invention to provide a molding apparatus capable of forming a mold.

[0007]

Means for Solving the Problems In order to solve the above-mentioned problems, the molding apparatus according to the present invention employs the following means.

That is, according to the first aspect of the present invention, in a molding apparatus in which a planar heater for heating a cavity is incorporated in a cavity constituting member surrounding and forming a cavity in which a product is molded, the planar heater is a cavity of the cavity constituting member. It is attached to a mounting groove dug along the unevenness of the cavity in the vicinity of the cavity from a surface other than the surface.

In this means, a planar heater is mounted adjacent to and along the cavity to evenly heat the cavity.

According to a second aspect of the present invention, in the mold apparatus of the first aspect, the planar heater is divided and attached to a plurality of surfaces along the unevenness of the cavity of the mounting groove.

In this means, the planar heater is attached to each of a plurality of surfaces along the unevenness of the cavity.

According to a third aspect of the present invention, in the molding apparatus of the first aspect, the planar heater is used only for a portion of a surface constituting a cavity along a concave and convex surface separately divided for a plurality of purposes. It is characterized by.

In this means, the planar heater is attached to both sides or one side of the core side and a part of the core side, the cabinet side and a part of the cabinet side, the slide surface and a part of the slide surface, respectively.

According to a fourth aspect of the present invention, in the molding apparatus of any one of the first to third aspects, the planar heater has flexibility and is mounted in a curved manner.

According to this means, the planar heater is mounted in a curved shape along the irregularities of the cavity.

According to a fifth aspect of the present invention, in the mold apparatus of any one of the first to fourth aspects, a cooling block is provided on a side opposite to the cavity of the planar heater.

In this means, the cooling block reinforces the back of the planar heater.

According to a sixth aspect of the present invention, in the molding die apparatus of any one of the first to fourth aspects, an air cooling structure is provided on a side opposite to the cavity of the planar heater.

According to this means, the cooling block in which the air cooling structure reinforces the planar heater as the heating source is cooled.

According to a seventh aspect of the present invention, in the molding apparatus of the sixth aspect, an air cooling structure and a water cooling structure or an oil cooling structure are used in combination.

In this means, the cooling block in which the air cooling structure and the water cooling structure or the air cooling structure and the oil cooling structure reinforce the planar heater as the heating source is cooled.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment (1) of a molding apparatus according to the present invention.

This embodiment shows one suitable for injection molding of a synthetic resin material.

The cavity constituting members 1 and 2 of this embodiment
Reference numeral 2 denotes a mold block and a core block embedded and supported by templates C and D mounted on template mounting plates A and B, respectively. These cavity constituting members 1 and 2 surround and form the cavity 3 having a U-shaped cross section.

A cavity groove 11 serving as a concave portion surrounding the cavity 3 is engraved in one cavity constituent member 1 which is a cavity block, and the cavity groove 11 is provided near the cavity groove 11 from a surface opposite to the cavity groove 11. A mounting groove 12 is dug along the recess of the eleventh portion. The planar heater 4 and the cooling block 13 are mounted in the mounting groove 12. The planar heater 4 is located on the cavity groove 11 side inside the mounting groove 12 and is backed by the cooling block 13. The cooling block 13 is located inside the mounting groove 12 on the opposite side of the cavity groove 11, and is backed by a backing block 15 fixed with screws 14.

On the other cavity constituting member 2 which is a core block, a core projection 21 serving as a convex portion surrounding the cavity 3 is protruded, and the core projection 21 is brought close to the core projection 21 from a surface opposite to the core projection 21. Mounting groove 22 along the protrusion of 21
Is engraved. A planar heater 4 and a cooling block 23 are mounted in the mounting groove 22. Planar heater 4
Is located on the side of the core projection 21 inside the mounting groove 22 and is backed by the cooling block 23. Cooling block 2
Numeral 3 is located on the opposite side of the core projection 21 inside the mounting groove 12, and is backed by a backing block 25 fixed with screws 24. These planar heaters 4 and cooling blocks 2
3, a backing block 25 is provided with a hole (not shown) for allowing the ejector pin 5 to pass therethrough in order to allow the ejector pin 5 to protrude.

A cooling water passage 6 through which cooling water flows is provided near the cavity forming members 1 and 2 of the mold plates C and D. Although not shown, the cooling water passage may be provided with another cooling passage.

According to this embodiment, the planar heater 4 is provided much closer to the cavity 3 than in a conventional simple sandwich. And cavity 3
The planar heater 4 provided in the vicinity of the cavity 3 is along the unevenness of the cavity 3. Therefore, even when the cavity 3 has a complicated and fine uneven structure for precision molding or the like, the heating temperature of the cavity 3 can be surely equalized. Of course, the shortening of the temperature rise time of the cavity 3 is not hindered.

In the heating by the sheet heater 4, the cooling block 1 is placed on the side of the sheet heater 4 opposite to the cavity 3.
Due to the presence of the components 3 and 23, unnecessary heating of the cavity constituting members 1 and 2 and surrounding members is prevented. Therefore,
It is possible to prevent long-term use by preventing thermal deterioration of each part, and to prevent heat from escaping to enhance thermal efficiency.
Note that the cooling blocks 13 and 23 also function as a member for forced cooling of the sheet heater 4 and a reinforcing member.

The mounting grooves 12 and 22 for mounting the planar heater 4 close to and along the cavity 3 are dug from the opposite surface of the cavity 3. Therefore, the mounting grooves 12, 22 can be dug out from the open surface using a machine tool, and the machining of the mounting grooves 12, 22 is not troublesome.

FIG. 2 shows an embodiment (2) of a molding apparatus according to the present invention.

In this embodiment, the cavity 3 has an arc-shaped cross section. Then, a flexible heater is selected as the sheet heater 4 and is curved and attached to the attachment grooves 12 and 22. Note that reference numeral 33 in the drawing denotes a cooling passage.

According to this embodiment, even if there is a round portion in the unevenness of the cavity 3, the planar heater 4 can be accurately mounted along the unevenness of the cavity. As a result, the uniformization of the heating temperature of the cavity 3 becomes more reliable.

FIG. 3 shows an embodiment (3) of a molding apparatus according to the present invention.

In this embodiment, the cavity 3 has a U-shape with a deep groove in cross section. Further, in one cavity constituent member 1 which is a cavity block, a plurality of mounting grooves 12 are provided, and the planar heater 4 is mounted in each of the mounting grooves 12. In the other cavity constituting member 2 which is a core block, the planar heater 4 is divided into
Each of the mounting grooves 22 is attached to a plurality of surfaces.

According to this embodiment, even if the unevenness of the cavity 3 is fine and complicated, the planar heater 4 can be accurately mounted along the unevenness of the cavity. As a result, the uniformization of the heating temperature of the cavity 3 becomes more reliable. The temperature can be set accurately by installing a sensor (not shown).

FIG. 4 shows an embodiment (4) of a molding apparatus according to the present invention.

In this embodiment, air cooling structures 17 and 27 are mounted inside the mounting grooves 12 and 22, respectively. The air cooling structures 17 and 27 are more effective if, for example, a permeable material or a porous material is used.
The cooling air passages 19 and 29 communicate with the outside through cooling spacers 18 and 28.

[0040]

As described above, in the molding apparatus according to the present invention, the planar heater is mounted close to and along the cavity to uniformly heat the cavity. There is an effect that can be converted.

Further, since the mounting groove for mounting the planar heater is dug from the surface on the opposite side of the cavity, it is possible to perform engraving work using a machine tool from the open surface. There is an effect that the work is not troublesome.

Further, since a cooling device is provided,
For various materials, precision molding, high-grade appearance molding, thin-wall molding, etc. can be performed under the same conditions as before without significantly changing molding conditions, molding cycles, and the like.

[Brief description of the drawings]

FIG. 1 is an embodiment (1) of a molding die apparatus according to the present invention.
FIG.

FIG. 2 is an embodiment (2) of a mold apparatus according to the present invention.
It is sectional drawing of the principal part which shows.

FIG. 3 is an embodiment (3) of a molding apparatus according to the present invention.
It is sectional drawing of the principal part which shows.

FIG. 4 is an embodiment (4) of a molding apparatus according to the present invention.
It is sectional drawing of the principal part which shows.

[Explanation of symbols]

 1, 2 cavity constituent member 3 cavity 4 planar heater 6 cooling water passage 11 cavity groove 12, 22 mounting groove 13, 23 cooling block 15, 25 backing block 17, 27 air cooling structure 21 core projection 33 cooling block Attached cooling water passage

Claims (7)

[Claims] 1. A molding apparatus in which a planar heater for heating a cavity is incorporated into a cavity component that surrounds and forms a cavity in which a product is molded, wherein the planar heater has a surface other than the surface of the cavity of the cavity component. A molding die device which is mounted in a mounting groove dug along a concave / convex shape of a cavity in the vicinity of a cavity. 2. The molding die apparatus according to claim 1, wherein the planar heater is divided and attached to a plurality of surfaces along irregularities of the cavity of the mounting groove. 3. The molding apparatus according to claim 1, wherein the planar heater is used only for a portion of a surface constituting a cavity along a concave and convex surface separately divided for a plurality of purposes. Mold device. 4. The molding apparatus according to claim 1, wherein the planar heater is flexible and is attached in a curved manner. 5. The molding apparatus according to claim 1, wherein a cooling block is provided on a side of the planar heater opposite to the cavity. 6. The molding die apparatus according to claim 1, wherein an air cooling structure is provided on a side of the planar heater opposite to the cavity. 7. The molding apparatus according to claim 6, wherein an air cooling structure and a water cooling structure or an oil cooling structure are used in combination.