JP2003033945A - Injection molding mold and mold clamping method in injection molding mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding mold and a mold clamping method in the injection molding mold which suppresses a cost increase and solve an issue of a biased wear in a precision mold. SOLUTION: When a mold clamping mechanism operates at molding and a movable side holder 2 moves toward a fixed side holder 1, a fixed side insert 62 arranged at a fixed side mold plate 60 and a movable side insert 70 arranged at a movable side mold plate 61A fit each other by abutting. It results in determining a position by automatically adjusting a center at low load and a concave portion 66 of the fixed side insert 62 and a concave portion 71 of the movable side insert 70 form a cavity. When the movable side holder 2 moves resisting each coil spring 73, a space between the movable side mold plate 61A and a mounting plate 61B is eliminated and the mold clamping operation is completed.

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 comprising a fixed side template having a fixed side insert and a movable side template having a movable side insert, and a method for closing a mold in an injection molding die. It is about.

[0002]

2. Description of the Related Art In a conventional injection molding die of this type, the fixed-side mold plate and the movable-side mold plate are provided on a fixed-side mounting plate and a movable-side mounting plate, respectively.

[0003]

The slight misalignment between the fixed-side mold plate and the movable-side mold plate causes problems such as dimensional defects of products and burrs. Therefore, generally, by improving the processing accuracy of all parts, that is, the fixed side mold plate, the movable side mold plate, the fixed side mounting plate, the movable side mounting plate, the molding machine, etc., the positional deviation is minimized. It corresponds.

However, even with this method, which naturally increases the cost, it is unavoidable that the accuracy conflicts with each other due to the limit of accuracy, the thermal deformation of the mold and the molding machine, and the influence of gravity. Furthermore, the more precise, the more susceptible it is to disturbances of other systems. Therefore, this problem is also regarded as fatal, and in general, parts that wear unevenly must be replaced regularly.

Therefore, in view of the above points, the present invention provides an injection molding die and a method for closing a mold in the injection molding die which suppresses the cost and solves the problem of uneven wear in the precision die. To aim.

[0006]

Therefore, the first invention is
In an injection-molding mold comprising a fixed-side mold plate having a fixed-side insert and a movable-side mold plate having a movable-side insert, the movable-side mold plate can be contacted and separated from a movable-side holder by a spring. Characterize.

A second aspect of the present invention is an injection molding die comprising a fixed-side mold plate having a fixed-side insert and a movable-side mold plate having a movable-side insert, wherein the movable-side mold plate is a movable-side holder. It is characterized in that it can be attached to and detached from a mounting plate fixed to.

A third aspect of the present invention is an injection molding die comprising a fixed-side mold plate having a fixed-side insert and a movable-side mold plate having a movable-side insert, wherein the movable-side mold plate is a movable-side holder. The movable side holder moves when the mold is closed, and the movable side insert and the fixed side insert are aligned and positioned when the mold is closed. The mold closing is completed by eliminating the gap between the movable mold plate and the mounting plate by further moving the movable holder against the spring.

Further, a fourth aspect of the invention is that the fixed-side template is inserted into the vertical groove formed in each of the left and right fixed-side clamp blocks, and the fixed-side holder is also provided with a pressing portion which is also vertically projected. The first fixing member that is fixed in the state of being pressed against and the mounting plate that is inserted into the vertical groove formed in each of the left and right movable side clamp blocks are movable by the pressing portion that also projects in the vertical direction. A second fixing member that fixes the side holder in a pressed state is provided.

A fifth aspect of the present invention comprises a fixed side template having a fixed side insert and a movable side template having a movable side insert, and the movable side template is fixed to a movable holder. A method for closing a mold in an injection molding die that is capable of coming into contact with and separated from a plate even if it is biased by a spring so that the movable side holder and the movable side nest are moved by moving the movable side holder. Positioning both nests by aligning with the nest of the fixed side mold plate, and further movement of the movable side holder against the spring eliminates the gap between the movable side mold plate and the mounting plate and completes mold closing. It is characterized by doing so.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. First, in FIG. 4 and FIG. 5, the vertically long fixed side clamp blocks 3 are attached to the left and right ends of the inner surface of the fixed side holder 1, and the vertically long movable side is attached to the left and right ends of the inner surface of the movable side holder 2. Attach the clamp blocks 4 respectively. In addition, a rectangular support member 6 protruding from the support pin 5 is fixed in the center at the lower end between the clamp blocks 3 on the inner side surface of the fixed side holder 1, and both sides of the inner side surface of the movable side holder 2 are fixed. At the lower end between the clamp blocks 4, a rectangular support member 8 having a support portion 7 protruding from the upper left and right is fixed.

Next, the mounting structure of the fixed clamp block 3 to the fixed holder 1 will be described with reference to FIGS. 6 to 8. FIG. 6 is a view of A- of FIG.
FIG. 7 is a sectional view taken along line A-B, FIG. 7 is a sectional view taken along line BB showing a tight portion below the guide portion, and FIG. 8 is a sectional view taken along line CC also showing a stopper portion below the tight portion.

In FIG. 6, an opening is formed in the fixed side holder 1 to project a guide pin 10, and a guide hole is slidably fitted in each fixed side clamp block 3. A bushing 12 having a mounting hole 11 is opened, and the guide hole 1 is provided at the inner end of the guide hole 11.
Open a mounting hole with a diameter larger than 1. Further, in each of the fixed side clamp blocks 3, a groove 13 is formed over the entire area in the vertical direction to press a fixed side template 60 described later, and the pressing portion 14 is also removed over the entire area in the vertical direction. To project.

Next, referring to FIG. 7, each of the fixed holders 1
A screw hole 16 having a screw thread on which a fixing pin 15 having a screw thread is screwed is formed at the tip of each of the fixed-side clamp blocks 3. A guide hole 19 in which the intermediate portion is slidably fitted in the fitting opening 17 and the locking portion 18 is formed, and a storage hole 21 in which a coil spring 20 wound around the fixing pin 15 is installed is formed.

Therefore, although the coil spring 20 is locked to the locking portion 18 and the fixed side holder 1 and urges the fixed side clamp blocks 3 away from the fixed side holder 1, they are screwed together. The fixed pin 15
It is a structure that cannot be removed.

Next, referring to FIG. 8, each of the fixed side holders 1
A screw hole 26 having a screw thread formed therein is formed in which a stopper pin 25 having a screw thread formed at the tip is screwed. The stopper pin 2 is provided in each of the fixed-side clamp blocks 3.
An opening 27 into which the head portion of 5 is fitted and a guide hole 28 into which the middle portion is slidably fitted are opened.

Therefore, as described above, the coil spring 20 is locked to the locking portion 18 and the fixed side holder 1,
Although the fixed clamp blocks 3 are urged away from the fixed holder 1, the distance between the fixed clamp blocks 3 is limited by the head of the fixing pin 15 screwed into the screw hole 26.

Next, the mounting structure of the movable clamp block 4 to the movable holder 2 will be described with reference to FIGS. FIG. 9 shows the guide part D of FIG.
Fig. 10 is a sectional view taken along line -D, Fig. 10 is a similar EE sectional view showing the tight portion below the guide portion, and Fig. 11 is a similar sectional view taken along line FF showing the stopper portion below the tight portion.

In FIG. 9, an opening is formed in the movable side holder 2 to project a guide pin 33, and a guide hole into which the guide pin 33 is slidably fitted in each movable side clamp block 4. The bush 34 having a mounting hole is provided with a mounting hole, and the guide hole 3 is provided at an inner end portion of the guide hole 35.
Open a mounting hole with a diameter larger than 5. Further, in each of the movable side clamp blocks 4, a groove 36 is formed over the entire area in the vertical direction in order to press and fix a mounting plate 61B, which will be described later, and a pressing portion 37 is also outwardly provided over the entire area in the vertical direction. To project.

Next, in FIG. 10, each movable holder 2 is provided with a screw hole 41 having a screw thread on which a fixed pin 40 having a screw thread on the tip is screwed. The movable clamp block 4 is provided with an opening 42 into which the head of the fixed pin 40 is fitted and a guide hole 44 into which the middle portion is slidably fitted into the locking portion 43, and is wound around the fixed pin 40. A storage hole 46 that internally houses the coil spring 45 to be mounted is opened.

Accordingly, although the coil spring 45 is locked to the locking portion 43 and the movable side holder 2 and urges the movable side clamp block 4 away from the movable side holder 2, the coil spring 45 is screwed. The fixing pin 40
It is a structure that cannot be removed.

Next, referring to FIG. 11, each movable holder 2 is provided with a stopper pin 50 having a threaded end.
Is formed with a screw hole 51 in which a screw thread to be screwed is formed, and an opening 52 into which the head of the stopper pin 50 is fitted and an intermediate portion are slidably fitted into each movable clamp block 4. The guide hole 53 is opened.

Therefore, although the coil spring 45 is locked to the locking portion 43 and the movable side holder 2 and urges the movable side clamp blocks 4 away from the movable side holder 2, the separation is caused. The interval is defined by the head of the stopper pin 50 screwed into the screw hole 51.

Next, referring to FIG. 1, the fixed-side template 60 having the fixed-side insert 62 will be described. Fixed side template 6
An opening 63 is opened at the center of 0. The stationary insert 62 has a rectangular parallelepiped shape, and a sprue bush 64 connected to an injection nozzle (not shown) is disposed in a mounting hole formed in the center so as to form a heat insulating air gap 65. Reference numeral 66 denotes a concave portion for forming a cavity, which has a structure in which a synthetic resin material is pressed into the cavity from an injection molding machine through an injection nozzle, a sprue bush 64 and a runner 67.

Next, also referring to FIG. 1, a movable side mold plate 61A having a movable side insert 70 will be described. The movable side mold plate 61A is configured to be able to come into contact with and separate from the mounting plate 61B. The movable side mold plate 61A is provided with a movable side insert 70 having a concave portion 71 for forming a cavity in the central portion. At the four corners of the mounting plate 61B, guide pins 72 are provided so as to project, and storage grooves 74 for housing a coil spring 73 wound around the guide pins 72 are provided. In addition, the movable side mold plate 61A is also provided with a storage hole 75 in which a coil spring 73 wound around the guide pin 72 is provided, and a bush which slidably fits into a locking portion 76 with which the coil spring 73 is locked. Open a guide hole at 77.

Therefore, the coil spring 73 is accommodated in the storage groove 74.
By locking the end portion and the locking portion 76 and urging the movable side mold plate 61A away from the mounting plate 61B,
The retaining portion 78 formed at the end of the guide pin 72 is engaged with the engaging portion 76 so that the guide pin 72 does not come off.

The fixed-side holder 1 and the movable-side holder 2 configured as described above are attached and fixed to a mold closing mechanism of an injection molding machine (not shown). At that time, the guide pin 33 of the movable-side holder 2 is fixed. The fixed side clamp block 3 is fitted into the guide hole 11 to bring the movable side clamp block 4 into contact with the fixed side clamp block 3 and then fixed.

In the fixed holder 1, the fixing pins 15 are loosened, and the fixed clamp blocks 3 are separated from the fixed holder 1 by a distance smaller than the thickness T1 of the left and right end portions of the fixed template 60. So that they are separated from each other,
The fixed-side template 60 having the fixed-side insert 62 is inserted into the groove 13 from above.

Then, the lower end of the fixed-side mold plate 60 comes into contact with and is supported by the support pin 5 projecting above the support member 6.

In the movable holder 2, the fixing pins 40 are loosened, and the movable clamp blocks 4 are moved.
From the movable side holder 2 to the thickness T of the left and right ends of the mounting plate 61B.
The movable side mold plate 61A provided with the movable side insert 70 and the mounting plate 61B are inserted into the groove 36 from above in a state where they are separated from each other so as to be spaced apart from each other.

Then, the lower end of the movable side mold plate 61A comes into contact with and is supported by each supporting portion 7 of the supporting member 8.

In this state, when the mold closing mechanism of the injection molding machine is manually operated in the mold closing direction, the movable side insert 70 and the fixed side insert 62 are brought into contact with each other so that the two fit together. When the operation is further continued manually against the coil spring 73, the movable side mold plate 61A and the mounting plate 6 are
There is no gap with 1B.

In this state, the manual operation is stopped, and the fixing pins 15 are rotated so as to be tightened, so that the pressing portion 14 presses the fixed-side template 60 against the fixed-side holder 1. Can be fixed. Further, by rotating the fixing pins 40 so as to be tightened, the mounting plate 61B can be pressed and fixed to the movable side holder 2 by the pressing portion 37. When this fixing is completed, the mold closing mechanism is manually operated in the mold opening direction to return to the initial position.

As described above, after the movable side insert 70 and the fixed side insert 62 are aligned, the movable side mold plate 61 is formed.
Since A and the fixed-side mold plate 60 are fixed to the movable-side holder 2 and the fixed-side holder 1, respectively, the time required for setting the injection molding die and the time required for accuracy can be significantly reduced. Is.

With the above, the setting of the injection molding die is completed, and the operation of closing the die will be described below. That is, at the time of molding, when the mold closing mechanism of the injection molding machine operates and the movable side holder 2 moves toward the fixed side holder 1, as shown in FIG. 2, the fixed side insert provided on the fixed side mold plate 60 is provided. 62 and the movable-side insert 70 provided on the movable-side mold plate 61A are in contact with each other, and they are fitted to each other in an "inlay structure" using a tapered surface. That is, since the movable side is floatingly supported, the nests 62 and 70 are automatically aligned and positioned with a low load, and the concave portion 66 of the fixed side nest 62 and the concave portion 71 of the movable side nest 70 are separated from each other. A cavity is formed by.

The present invention may have any structure as long as the nests 62 and 70 forming the cavity can be positioned with each other. For example, a pin or a hole is provided in either of the nests 62 and 70, and the taper of the hole is used. Then, the pin may be fitted in the hole and both the nests 62, 70 may be fitted and positioned.

Therefore, the cavity can be formed only by the precision of the fixed-side insert 62 and the movable-side insert 70 without being affected by the disturbance of other movable systems such as thermal deformation and bending.

When the movable holder 2 moves further against the coil springs 73, as shown in FIG. 3, the gap between the movable mold plate 61A and the mounting plate 61B disappears, and the high-pressure mold closing is completed. Becomes

At this time, the position of the cavity is already determined even when the movable system is displaced due to disturbance,
It is not affected by the disturbance.

Then, under the condition that the fixed-side insert 62 and the movable-side insert 70 are at a high temperature, an injection nozzle (not shown) is inserted through the opening of the movable-side holder 1 to sprue the bush 64.
Then, the synthetic resin material is injected and injected into the cavity through the runner 67.

Next, the pressure is maintained at this high temperature for a predetermined time, and then the fixed side insert 62 and the movable side insert 70 are cooled for a predetermined time, which is formed on the fixed side mold plate 60 and the movable side mold plate 61A. Cooling water, which is a cooling medium, is supplied to a water channel (not shown). And so-called mold opening,
The molded product is taken out by an ejector pin (not shown).
It repeats likewise again.

In the present embodiment, the mold for high temperature injection molding is described as an example, but the present invention is not limited to this and may be applied to a mold for low temperature injection molding.

Although the embodiments of the present invention have been described above, various alternatives, modifications, and variations can be made by those skilled in the art based on the above description, and the present invention is not limited to the above-mentioned various modifications. It is intended to cover alternatives, modifications or variations.

[0044]

As described above, the present invention can provide an injection molding die and a method for closing a mold in an injection molding die that can suppress the cost and solve the problem of uneven wear in a precision die. it can.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view of an injection molding die, which is a cross-sectional view taken along line XX of FIGS. 4 and 5.

FIG. 2 is a cross-sectional plan view of the injection-molding die in a state where both the nests are aligned and positioned;
It is an X sectional view.

3 is a cross-sectional plan view of the injection-molding die in a mold-closed state, which is a cross-sectional view taken along line XX of FIGS. 4 and 5. FIG.

FIG. 4 is an inner side view of a fixed holder.

FIG. 5 is an inner side view of a movable side holder.

6 is a cross-sectional view taken along the line AA of FIG.

7 is a sectional view taken along line BB of FIG.

8 is a cross-sectional view taken along line CC of FIG.

9 is a cross-sectional view taken along line DD of FIG.

10 is a cross-sectional view taken along line EE of FIG.

11 is a sectional view taken along line FF of FIG.

[Explanation of symbols]

1 Fixed side holder 1 2 Movable holder 3 Fixed side clamp block 11 Guide hole 33 guide pin 60 Fixed side template 61A movable side template 61B mounting plate 62 Fixed side nesting 70 Movable side nesting 73 coil spring

Claims (5)

[Claims] 1. A mold for injection molding comprising a stationary mold plate having a stationary insert and a movable mold plate having a movable insert, wherein the movable mold plate is contacted with and separated from a movable holder by a spring. A mold for injection molding which is characterized in that it is possible. 2. An injection molding die comprising a fixed-side mold plate having a fixed-side insert and a movable-side mold plate having a movable-side insert, wherein the movable-side mold plate is fixed to a movable-side holder. A mold for injection molding, characterized in that the plate can be brought into and out of contact with a spring. 3. An injection molding die comprising a stationary mold plate having a stationary insert and a movable mold plate having a movable insert, wherein the movable mold plate is fixed to a movable holder. Even if the plate is biased by a spring so as to be separated from each other, the plate can be contacted and separated, and when the mold is closed, the movable holder moves so that the movable insert and the fixed insert are aligned and positioned. On the contrary, by further moving the movable side holder, the mold closing is completed by eliminating the gap between the movable side mold plate and the mounting plate. 4. The fixed-side template, which is inserted into the vertical groove formed in each of the left and right fixed-side clamp blocks, is pressed against the fixed-side holder by a pressing portion that is also provided in the vertical direction. The first fixing member to be fixed and the mounting plate inserted in the vertical groove formed in each of the left and right movable side clamp blocks are pressed against the movable side holder by the pressing portion also provided in the vertical direction. The mold for injection molding according to any one of claims 1 to 3, further comprising a second fixing member that is fixed in a state. 5. A fixed-side mold plate having a fixed-side insert and a movable-side mold plate having a movable-side insert, and the movable-side mold plate is separated by a spring from a mounting plate fixed to a movable-side holder. A method for closing a mold in an injection molding die that is urged so as to be able to come into contact with and separate from the movable side insert and the fixed side mold plate by moving the movable side holder at the time of closing the mold. Both the nests are positioned by aligning the nest with each other, and the mold closing is completed by eliminating the gap between the movable side mold plate and the mounting plate by further moving the movable side holder against the spring. A method for closing a mold in an injection molding die, which is characterized by: