JPH06285915A - Injection mold device - Google Patents

Abstract

PURPOSE:To easily control temperature of a cassette mold and easily mount and demount the cassette mold in and from a base mold, in an injection molding device using the cassette mold. CONSTITUTION:Fixed blocks are provided on a front face at both sides of a base mold Q at movable side and a temperature control block is provided on the inside thereof in a state energized by an energization means 8. The temperature control block is made of a highly heat conductive material and equipped with a cooling water passage 7c as a temperature control means. A cassette mold 13 is mounted in a cassette mold housing recess 4a of the base mold, being held by its both side faces which are stuck to the side face of the temperature control block. As the cassette mold is not equipped with the temperature control means, troublesome labor such as connection of joints is unnecessary and the cassette mold can be mounted in the base mold easily by only making the cassette mold 13 intrude into the base mold Q from the front. The same structure as above is provided also in the case of a cassette mold 24 of a fixed mold P.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding die apparatus having a temperature adjusting means.

[0002]

2. Description of the Related Art An injection molding die apparatus needs to inject a molten resin into a cavity at high pressure and high speed. However, in the past when the mold temperature is high, it takes time for the molded product to solidify, which lengthens the curing time and causes the molding cycle to become longer, and when the molded product becomes hot, it cools. The uniform shrinkage is hindered by the part and wall thickness of the part, which causes a distorted molded product. On the other hand, if the mold temperature is too low, the cooling rate of the molded product will be too fast, and the surface quality of the molded product will be impaired. Therefore, it is required that the temperature of the mold is always kept at an appropriate temperature. As a means for appropriately maintaining the temperature of the mold, generally, a water pipe through which a cooling liquid passes is provided around the part where the mold cavity is formed, and cooling water or oil is passed through the pipe. The temperature around the cavity is controlled by cooling it.

As a recent trend, in order to reduce the cost of a mold, cassette molds having different cavities can be removably mounted so that even if the shape of a molded product is different, it can be dealt with with a minimum modification of the mold. Although such injection molding die apparatuses are widely used, temperature control is also required for these die apparatuses. On the other hand, a water pipe having an inlet / outlet is provided on the side surface of the base mold, a water pipe is also provided in the cassette mold, and both water pipes are connected by using a joint when the cassette mold is mounted. There is also a structure in which the periphery of the cavity is cooled by supplying cooling water or the like (for example, Japanese Patent Publication No. 3-59809).

[0004]

As in the above-mentioned conventional example,
In an injection molding machine with a cassette mold that can be inserted and removed freely, if the cassette mold is also provided with a temperature control water pipe, the structure of the mold becomes complicated and the cassette mold is mounted on the base mold. In doing so, it takes time and effort to connect the base mold and the water pipe of the cassette mold by using a joint, which is an obstacle to the automation of the attachment / detachment operation of the cassette mold.

Therefore, an object of the present invention is to make it possible to adjust the temperature of a cassette mold without providing a water pipe in the cassette mold in an injection molding mold apparatus employing the cassette mold, and to attach and detach the cassette mold. It is to facilitate automation.

[0006]

In order to achieve the above object, the injection molding die apparatus of the present invention has a base die having a cassette die accommodating recess and a cassette die accommodating recess. The cassette mold and at least one pair of temperature control blocks, which are arranged so as to face each other around the cassette mold storage recess and are movable on the base mold, and which have temperature control means, and a temperature control block. Each of these temperature control blocks has a biasing means for biasing them so that they approach each other.When the cassette mold is mounted in the cassette mold accommodating recess, the biasing force of the biasing means is used. It is designed to be held tightly on the side of the cassette mold.

In order to improve the heat exchange effect of the cassette mold, it is desirable that the temperature control block be made of a material having high thermal conductivity.

[0008]

When the cassette mold is mounted on the base mold, the cassette mold need only be clamped by a pair of biased temperature control blocks, and no labor such as connection of joints is required. Since one side surface of the temperature control block is in close contact with and sandwiched by the side surface of the cassette mold, the thermal conductivity between the temperature control block and the cassette mold is increased, and heat exchange between them is promoted. If the temperature control block is made of a material having high thermal conductivity, heat exchange between the temperature control block and the cassette mold is further promoted.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the injection mold of the present invention is roughly divided into a fixed mold P and a movable mold Q. The movable mold Q can be moved back and forth along a guide axis R fixed to the fixed mold P.

First, the movable die P will be described. As shown in FIG. 3, the structure of the movable side mold Q is such that the front side (left side in the drawing) of the movable side mounting plate 1 located on the outermost side (right side).
In addition, a spacer block 2 is provided. A receiving plate 3 is provided on the front surface of the spacer block 2, and a movable base plate 4 is provided on the front surface thereof.

The size of the base plate 4 is such that the four corners are located inside the four guide shafts R provided around it, and the receiving plate 3 and the base plate 4 are fixed via the fixing pins 5. .

As shown in FIGS. 2 and 3, the base plate 4
A cassette mold accommodating recess 4a for inserting a cassette mold, which will be described later, is provided at the center of the recess, and engaging protrusions 4c, 4c for positioning the cassette mold are formed in the vicinity of the outer periphery of the recess. There is.

Fixed blocks 6 and 6 having a cross section close to a square are fixed to both sides of the front surface of the base plate 4. Inside the fixed blocks 6 and 6, temperature control blocks 7 and 7 made of brass and having a substantially rectangular cross section are provided.

A through hole 6 is formed on the side surface of each of the fixed blocks 6 and 6.
a and 6a are provided, and female threads are engraved on the outer half of the through hole. The compression springs 8 and 8 which constitute the biasing means of the temperature control blocks 7 and 7 are attached to the inner half of the through holes. The compression spring 8 is supported so as not to move backward by screwing push screws 9, 9 into the female screw portion, and urges the temperature control blocks 7 toward each other.

Another pair of insertion holes 6b and 6b are provided on the side surfaces near the both ends of each of the fixed blocks 6 and 6,
The water pipes 10 are inserted into the insertion holes 6b.
The joint portion 10a provided at the tip of the water pipe 10 is processed into a pipe screw, and is screwed into the pipe internal thread b portion 7a formed in the temperature control blocks 7 and 7, respectively.
And the temperature control block 7 are connected.

A guide water passage 7b having the same diameter as the inner diameter of the water pipe 10 is provided at a position from the depth of the female screw portion 7a to near the inner surface of the temperature control block 7. This guide channel 7b
It communicates with the cooling water passage 7c that constitutes the temperature adjusting means.
The cooling water passage 7c is composed of a vertical hole formed so as to vertically cut along the inner side surface from the other end of the temperature control block 7. The opening 7d of the cooling water passage 7c is stoppered. A guide water channel 7 communicating with the cooling water channel 7c near the other end of the temperature control block 7
b is provided, and the tip end portion 10a of the water pipe 10 is connected to these guide water passages as described above, and the water guided from one water pipe 10 into the temperature control block 7 is cooled water passage 7c. It can pass through the inside and be discharged from the other water pipe 10.

In the temperature control block 7, the compression springs 8 on both sides of the fixed block 7 are vertically penetrated at positions in front of the tips of the compression springs 8, and the centers of the two circles are slightly displaced, and the front end is large. An elliptical pin insertion hole 7d having a diameter is provided. A head having a large diameter and a support pin 12 having a threaded portion at its tip is inserted into the pin insertion hole 7d. The support pin 12 has its tip screwed into a screw hole provided in the base plate 4, and its head engages with the large diameter portion of the pin insertion hole to lock the temperature control block 7 on the front surface of the base plate 4. is doing. A disc spring is provided between the temperature control block 7 and the large diameter portion, and the temperature control block 7 is slidable on the front surface of the base plate 4 by supporting the temperature control block 7 at a predetermined pressure. The inner surface of the temperature control block 7 is formed as an inclined surface 7e having a slightly wide front surface to facilitate insertion of the cassette mold 13 from the front.

As shown in FIG. 1, a cassette mold 13 is mounted in the cassette mold accommodating recess 4a of the base plate 4. The cassette mold 13 is composed of a mold plate portion 13a having a cavity portion 13b and a first projecting mechanism 14. The mold plate portion 13a has a size suitable for being sandwiched between a pair of opposing temperature control blocks 7, 7, and a positioning hole 1 that can be engaged with the engagement protrusion 4c of the base plate.
It has 3c and 13c.

The first projecting mechanism 14 is provided with a projecting plate 14c and a projecting pin 14d fixed to the projecting plate in a block surrounded by a spacer 14a fixed to the back surface of the template 13a and a bottom plate 14b. It is configured.

The cassette mold 13 has a first protruding mechanism 1
The portion 4 is inserted into the cassette mold accommodating concave portion 4a, and the back surface of the mold plate portion 13a is engaged with the front surface of the base plate 4 to be mounted on the base mold.

Behind the first projecting mechanism 14, there is provided a second projecting mechanism 15 housed in a recess provided in the spacer block 2 and the receiving plate 3. The second projecting mechanism 15 is composed of a second projecting plate 15a and a second projecting pin 15b.

As shown in FIG. 3, the cassette mold is mounted on the base mold in a mold open state in which the fixed mold P and the movable mold Q are separated from each other. By a cassette mold exchanging device (not shown), the cassette mold 13 having a desired cavity portion is moved in the direction perpendicular to the paper surface and positioned so that the engagement protrusion 4c and the engagement hole 13c are aligned with each other. Next, when the cassette mold 13 is advanced in the direction of the movable mold Q (right side), the side surface of the flange portion 13a is guided by the inclined surface 7e formed on the inner side surface of the temperature control block 7, and the bias is applied. The pair of temperature control blocks 7, 7 being pushed in is pushed in to enter. Here, the first protruding mechanism 1
The second projecting mechanism 1 is inserted into the projecting hole provided on the bottom surface of
The tip of the projecting pin 15b of No. 5 is inserted, and the first projecting mechanism can be operated by the second projecting mechanism. At the same time, the bottom surface of the flange portion 13a comes into contact with the front surface of the base plate 4, the cassette mold 13 is locked, and the mounting process to the base mold is completed. The cassette mold 13 is sandwiched in a state where both side surfaces are in close contact with the side surfaces of the temperature control blocks 7, 7 urged by the urging means 8, 8.

Next, the fixed mold P will be described. As shown in FIG. 3, a nozzle bush 17 having a sprue 17a is inserted through a locating ring 18 into a hole 16a provided in the center of a fixed-side mounting plate 16 fixed to an injection molding machine (not shown). Have been installed.

A receiving plate 19 is provided in contact with the front surface (right side in the drawing) of the fixed-side mounting plate 1, and a fixed-side base plate 20 is provided in contact with the front surface thereof. Backing plate 19
The tip portion of the nozzle bush 17 is fitted in the tapered hole 19a provided in the center of the mounting plate 1, and the tip portion is provided in the pin hole 17b provided near the outer peripheral portion of the receiving plate. The stopper pin 21 screwed in is inserted, and when the receiving plate 19 moves for a predetermined distance, the head of the stopper pin catches on the front surface of the receiving plate 19 and stops.

The receiving plate 19 and the base plate 20 are formed in a size corresponding to the movable base plate 4. A cassette mold storage recess 20a is provided in the center of the base plate 20, and a storage hole 20b for the stopper pin 21 is provided near the outer peripheral portion. Engagement projections 20c, 20c for positioning the cassette mold, which will be described later, are provided on both sides of the cassette mold storage recess 20a.

A pair of fixed blocks 22 and 22 are fixed to both sides of the front surface of the base plate 20, similarly to the movable mold Q, and a pair of temperature control blocks 23 and 23 are provided inside each fixed block. It is provided. The fixed block and the temperature control block have the same structure as the movable mold, including the urging means 8 and the temperature adjusting means 23c.

As shown in FIG. 1, a fixed-side cassette mold 24 is mounted in the fixed-side base plate 20 in the cassette-mold accommodating recess 20a.

The cassette mold 24 is composed of a collar portion 24a having a cavity 24b at the front portion and a body portion 24c at the rear portion. Cassette mold 24 Front brim 24
a is formed to have a larger area than the rear body portion 24b, the body portion 24b is fitted into the cassette mold accommodating recess 20a, and the collar portion 24a is locked to the front surface of the base plate 20. The positioning is performed by engaging the engagement protrusion 20c with the positioning hole 24e provided in the collar portion 24a. At the center of the cavity portion 24b formed on the front surface of the cassette mold 24, a runner portion 24d communicating with a sprue 17a described later is provided.

The cassette die 24 on the fixed side is attached to the base on the fixed side.
The procedure for mounting the mold on the mold P is similar to that for the movable mold Q. As in the case of the movable mold Q, the cassette mold 2
The outside of the collar portion 24a of 4 has a pair of temperature control blocks 23,
Guided by an inclined surface 23e formed on the inner side surface of 23, the pair of energized temperature control blocks 23, 23 is pushed in to spread, and is sandwiched in close contact with the side surface. Further, the sprue 17a of the base mold and the runner portion 24d are connected to each other, and the molten resin can be injected into the cavity.

In this embodiment, each pair of temperature control blocks is described, but it is also possible to provide two pairs of temperature control blocks to improve the temperature control capability. . Further, the structure of the cassette mold is not limited to that of this embodiment, and may be any structure that can be held between the temperature control blocks.

[0031]

As described above, according to the present invention, the temperature adjusting means is provided only in the temperature adjusting block, and the cassette mold is not directly provided with a water channel or the like. It does not require troublesome work such as connection of joints, and facilitates the mounting / dismounting operation of the cassette mold, which contributes to the automation of the mounting / dismounting of the cassette mold. Further, since the temperature control block closely holds the side surface of the cassette mold by the biasing means, the heat exchange action between the cassette mold and the temperature control block is activated, and the temperature control of the mold is facilitated. .

If the temperature control block is made of a material having high thermal conductivity, there is an effect that the heat exchange action between the cassette mold and the temperature control block can be further improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is a front sectional view showing a state where a cassette mold is not attached to a movable mold.

FIG. 3 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 P, Q Base mold 4a, 20a Cassette mold storage recess 7,23 Temperature control block 7c, 23c Temperature adjusting means 8 Energizing means 13,24 Cassette mold

Claims (2)

[Claims] 1. A base mold having a cassette mold accommodating recess, a cassette mold insertable into and removable from the cassette mold accommodating recess, and arranged so as to face each other around the cassette mold accommodating recess. The temperature control block includes at least one pair of temperature control blocks that are movable on the base mold and that have temperature control means, and a biasing means that biases the temperature control blocks toward each other. The temperature control block is characterized in that when the cassette mold is mounted in the cassette mold accommodating recess, the temperature control block is in close contact with the side surface of the cassette mold by the urging force of the urging means. Injection mold equipment. 2. The injection molding die apparatus according to claim 1, wherein the temperature control block is made of a material having high thermal conductivity.