JPH0157649B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding die, and more particularly, the present invention relates to a mold for molding, and more particularly, it is capable of fixing an insert in a fixed position with high precision, easily and reliably, and also fixing the insert and controlling the temperature inside the insert. The present invention relates to a molding die that can be connected to a circuit at the same time and that allows automatic replacement of inserts.

In recent years, with the diversification of the uses of molded products and the reduction in the amount of molded product inventory, there has been a need for high-variety, low-volume production. The aim is to shorten the time required, reduce mold costs, and use mold stock space more efficiently by downsizing the mold.

In conventional molding molds in which only the insert is replaced, as shown in JP-A-54-137433, the insert and the insert insertion recess of the mold body are square-shaped, and the mold body is There is a bolt that is inserted through the insert and screwed onto the insert, and the insert is pulled and fixed to a predetermined corner of the insert insertion recess.

In such a mold, the insert is fixed with its two surfaces in contact with the mold body, so the positioning accuracy is improved, and the cavities, runners, etc. formed in the insert are fixed with the two surfaces as the reference plane. It has the advantage of being easy to process.

However, in this mold, the insert is positioned and fixed with bolts, and when replacing the insert, the bolt must be turned and removed each time.As mentioned above, inserts must be replaced frequently in high-mix, low-volume production. It is very cumbersome when it is done manually, and furthermore, there is a drawback that it is difficult to automatically perform the nest replacement.

Conventionally, the temperature control circuit was installed inside the insert because the insert was small and had a small heat capacity, and could follow the temperature of the mold body in a relatively short time. If a circuit is provided, the temperature control exhaust circuit must be connected each time a nested conversion is performed, so this is not generally done.

However, as mentioned above, inserts are being replaced frequently, and when changing the temperature depending on the shape or material of the molded product, the conventional method of changing the temperature of the mold body is time consuming and inconvenient. This created a need to directly control the temperature of the insert, and it was desired to develop a mold that could easily connect a temperature controller to the temperature control circuit installed inside the insert. .

The present invention has been made in view of the above circumstances, and its purpose is to be able to fix the insert in a fixed position accurately, easily and reliably, and to fix the insert and insert the insert into a fixed position with high precision. The purpose of the present invention is to provide a molding mold that can simultaneously connect a temperature control supply/exhaust circuit to an internal temperature control circuit, and its features include a mold body in which a polygonal insert insertion recess is molded, and a cavity. is formed, and a polygonal insert is inserted into the insert insertion recess, and the insert is pressed to a predetermined corner of the insert insertion recess, and two of the outer wall surfaces of the insert are inserted into the insert insertion recess. A pressing surface for pressing the insert to a predetermined corner of the insert insertion recess in a molding die comprising a fixture for positioning and fixing the insert by contacting two of the inner wall surfaces of the insertion recess. is formed on the outer wall surface of the insert opposite to the corner, a temperature control circuit is provided inside the insert, and an inlet/output of this temperature control circuit is provided on the outer wall surface of the insert, and The inner wall surface of the insert insertion recess facing the pressing surface and the inlet/outlet arrangement surface is removed, and the pressing part that comes into contact with the pressing surface of the insert and the connection part connecting the heat medium supply/discharge port to the inlet/outlet are fixed as described above. At the same time, the fixing device is configured to be able to move forward and backward toward the insert from the open portion of the mold body, and simultaneously fixes the insert and connects the heat medium supply/discharge port to the temperature control circuit inside the insert. That's where I did it.

Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a plan view showing the parting surface of one of the split molds, and the other mold is constructed in the same manner.

1 is a mold body, and 1a is a guide bar. A substantially square recess 1b is formed in the parting surface of the mold body 1, into which a insert to be described later is inserted. Also, of the inner walls of this recessed portion 1b, the lower inner wall in FIG. 1 has been removed and is open downward. Incidentally, among the inner walls of the recess 1b, the upper inner wall 1c and the left inner wall 1d serve as reference surfaces when fixing the insert.

Reference numeral 2 denotes a nest, which is formed into a substantially square shape that is slightly smaller than the recess 1b, and has a cutout at the lower right corner of FIG. 1 to press the insert 2 against the reference surface of the recess 1b. A pressing surface 2a is formed for this purpose. Further, this pressing surface 2a is an inclined surface that spreads outward from the parting surface toward the bottom surface, and prevents the insert 2 from lifting off from the parting surface when pressing this pressing surface 2a.

Note that this pressing surface 2a is preferably formed so that the bisectors of the interior angle formed by the reference surface are perpendicular to each other, but this is not necessarily the case. It is fine as long as it is on the same side.

A temperature control circuit 2b, which is a flow path for a heat medium, is formed inside the insert 2, and a heat medium is supplied to and discharged from the temperature control circuit 2b on the lower side of the insert 2 in FIG. A connecting tool 2c is provided to protrude.

Reference numeral 3 denotes a fixture for pressing and fixing the insert 2 into the recess 1b, and a hydraulic cylinder 3a attached to the mold body 1 causes the opening of the mold body 1 to be directed toward the insert 2. You can freely advance and retreat. On the surface of the fixture 3 facing the insert 2, a pressing portion 3b is located corresponding to the pressing surface 2a and comes into contact with the pressing surface 2a.
A connector 3c for connecting an external temperature controller or the like (not shown) is provided at a position corresponding to the connector 2c.

4 is a heat insulating layer made of asbestos, etc.;
As shown in the figure, it is provided in each mold body 1 of the split mold. This heat insulating layer 4 is formed on the mold body 1 by a block 4b fixed to the mold body 1 with bolts 4a so that the insert 2 does not come into direct contact with it. Note that the recess 1b is formed by the inner wall surface of the block 4b.

Then, the fixture 3 is moved back downwards,
Insert the insert 2 into the recess 1b so that its pressing surface 2a is at the lower right position, and then insert the hydraulic cylinder 3 into the recess 1b.
When the fixture 3 is raised by a, the pressing part 3b of the fixture 3 presses the pressing surface 2a of the insert 2, presses and fixes the insert 2 to the upper left corner of the recess 1b,
The fixture 3 and the connectors 3c and 2c of the insert 2 are connected, and the heat medium circulates in the temperature control circuit 2b, so that only the insert 2 is temperature-controlled.

When the insert, which is now extremely easy to fix, is removed from the mold body and stored or for preliminary temperature control, it is recommended to connect the movable insert and the fixed insert to each other. suitable.

3 and 4 show the mechanism for connecting the movable side insert and the fixed side insert, and explain this. 10 is the movable side insert, 11 is the fixed side insert, and they are as follows. A temperature control circuit is disposed inside, and connecting portions 10a and 11a for connecting a heat medium circuit such as a temperature control device are provided protruding from the lower side of each of them. Further, on the side wall surfaces of the movable side insert 10 and the fixed side insert 11, a pressing surface 10b and a pressure surface 10b for pressing and fixing each insert to a predetermined corner of the insert insertion recess formed in the respective mold body. 11b is formed.

Reference numeral 12 designates a guide pin, whose base end is fixed to the stationary side insert 11 and whose tip protrudes from the parting surface, and which is inserted into the guide hole 10c drilled in the movable side insert 10 during mold clamping, and is inserted into both inserts. Guide the child to keep its relative position constant.

The pressing surface 10b of this guide pin 12
A narrow diameter portion 12b is formed in the middle of the circumferential surface of the guide pin 12a located nearby.

Reference numeral 13 denotes a plate-shaped stopper, which is positioned corresponding to the narrow diameter portion 12b during mold clamping by inserting the guide pin 12a through a through hole 13a bored with an inner diameter slightly larger than the outer diameter of the guide pin 12a. protrudes from the pressing surface 10b, and its base end is biased by a compression spring 14 in the direction of projection from the pressing surface 10b, and is disposed on the movable insert 10. Note that when the tip of the stopper 13 is pressed against the bias of the compression spring 14 to the same level as the pressing surface 10b, the center of the through hole 13a coincides with the axis of the guide pin 12a, and the guide pin 12a The stopper 13 can be inserted freely.

Therefore, in order to attach both inserts connected by the stopper 13 and the guide pin 12a to the mold body, first insert the stationary side insert 11 into the insert insertion recess of the stationary side mold body, The fixing tool 3 from below
to fix both inserts to the stationary mold body. When the movable mold body is moved to the mold clamping position, the movable insert 10 is positioned in the insert insertion recess of the movable mold body. If the movable side insert is then fixed by pressing the pressing surface 10b with the pressing part 3b of the fixture 3 by raising the fixture 3, the pressing part 3b will push the stopper 13 at the same time, and both inserts will be fixed. The child is uncoupled. In addition, in order to remove both inserts from the mold body, the operations may be performed in the reverse order as described above.

Next, Figures 5 and 6 show a mold in which both inserts connected as described above are automatically removed from or attached to the mold body. To explain, reference numeral 15 denotes handling holes drilled at two locations in the vertical direction on both vertical wall surfaces of the movable side insert 10.
This handling hole 15 is provided in the insert on which the stopper 13 is disposed, and as described above, the insert on which the stopper 13 is disposed is connected to the mold body. This is suitable because it is exposed from the other mold body during installation.

Reference numeral 16 denotes an arm of the mold changing robot, which consists of a finger 16a that advances and retreats toward both vertical walls of the movable insert 10, and a claw 16b that protrudes from the inner surface of the finger 16a and fits into the handling hole 15. Become. The mold changing robot (not shown) moves the arm 16 forward and backward relative to the molding machine.
It moves left and right, up and down, and both connected inserts are moved between the mold stocker outside the molding machine and the mold body of the molding machine.

In this way, according to the present invention, the insert is formed into a polygonal shape having a pressing surface for pressing it into a predetermined corner of the insert insertion recess of the mold body, and the insert is pressed by pressing this pressing surface. The fixing device for fixing is movable toward the insert and can be moved back and forth, and the fixing device is provided with a connecting device for connecting a heat medium circuit such as an external temperature controller to the temperature control circuit inside the insert. Therefore, not only is it extremely easy to replace the insert, but the positioning accuracy of the insert is improved, and furthermore, the insert can be fixed and the external temperature control heat medium circuit can be connected to the inner temperature control circuit of the insert at the same time. This has the great effect of making it possible to automatically replace the insert.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the parting surface of the molding die according to the present invention, FIG. 2 is a cross-sectional view taken along line A-A, and FIG. 3 is a rear view showing a state in which both split inserts are connected. Figure 4 is a sectional view taken along line B-B, Figure 5 is a side view of the insert with handling holes for lifting both connected inserts, and Figure 6 is a line C-C in Figure 5.
FIG. 3 is a cross-sectional view and a plan view of the handling arm. 1... Mold body, 1a... Guide bar, 1b... Recess, 1c... Upper inner wall, 1d... Left inner wall, 2... Insert, 2a... Pressing surface, 2b... Temperature control circuit, 2c... Connection tool, 3... Fixing tool , 3a... Hydraulic cylinder, 3b... Pressing part, 3c... Connector, 4... Heat insulation layer, 4a... Bolt, 4b... Block, 10... Movable side insert, 10a
...Connection part, 10b...Press surface, 10c...Guide hole,
DESCRIPTION OF SYMBOLS 11... Fixed side insert, 11a... Connection part, 11b... Pressing surface, 12, 12a... Guide pin, 12b... Small diameter part, 13... Stopper, 13a... Through hole, 14... Compression spring, 15... Handling hole, 16...Arm,
16a...Finger, 16b...Claw.

Claims (1)

[Claims] 1 A mold body in which a polygonal insert insertion recess is formed, a cavity is formed, a polygonal insert to be inserted into the insert insertion recess, and a predetermined corner of the insert insertion recess. A molding die comprising a fixture for positioning and fixing the insert by pressing it against the insert and bringing two of the outer wall surfaces of the insert into contact with two of the inner wall surfaces of the insert insertion recess, A pressing surface for pressing the insert into a predetermined corner of the insert insertion recess is formed on the outer wall surface of the insert opposite to the corner, and a temperature control circuit is provided inside the insert. The input and exit of the regulator circuit is provided on the outer wall surface of the insert, the inner wall surface of the insert insertion recess that faces the pressing surface of the insert and the input/outlet arrangement surface is removed, and a pressing portion that comes into contact with the pressing surface of the insert is provided. The fixing device is provided with a connecting portion for connecting the heat medium supply/discharge port to the inlet/outlet, and the fixing device is configured to be able to move forward and backward from the open portion of the mold body toward the insert, thereby fixing the insert. A mold that simultaneously connects the heat medium supply and discharge port to the inner temperature control circuit of the insert.