JPH0238378B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a split mold locking mechanism, and more particularly to a split mold locking mechanism suitable for use in a molding die in which only the insert is replaced.

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 reduce mold costs, reduce mold costs, and make more efficient use of mold stock space by downsizing the mold.

The insert is replaced extremely frequently, and the insert is usually composed of at least two split molds (molds), so it is important to connect both split molds to each other. It is suitable for attachment to or removal from the mold body, as well as for its storage and preliminary temperature control.

The present invention has been made in view of the above circumstances, and its purpose is to connect the two molds using a guide pin that guides the two molds, which are split molds, and to easily lock them. It is possible to automatically attach and detach the mold from the molding machine, and also to prevent separation of the two molds and damage to the cavity, runner, etc. that may occur when storing the two molds. The purpose of the present invention is to provide a split-type locking mechanism that can be used.

The feature is that there is a split mold locking mechanism that connects together a nesting mold consisting of at least two split molds that have been removed from the attachment part of the mold body. At least one guide pin whose base end is fixed to one side and whose tip protrudes from the parting surface and is inserted into a guide hole provided in the other split mold so as to be freely advanced and retracted, and a predetermined position of the guide pin protruding from the parting surface. A latching part provided on the other split die, and a split latching part provided on the other split die, protruding freely forward and backward into the guide hole, and coming into contact with and separating from the wall surface of the latching part of the guide pin, are integrally formed. When the connected two split molds are attached to the mounting part of the mold body, the protruding end protruding from the wall surface of the split mold is pressed against the wall surface of the mounting part of the mold body, and the two split molds are separated by the split mold hanging part. and a stopper for releasing the connection.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a molding die of a replaceable insert type in an injection molding machine will be described below with reference to 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 orthogonal to each other, but this is not necessarily the case. Any surface facing toward the corner formed by the reference surface may be used.

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 pre-temperature-controlled, 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 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.

12 is a guide pin whose base end is fixed to the fixed side insert 11 and whose tip protrudes from the parting surface, and which connects the fixed side insert 11 and the movable side insert 10 together (hereinafter referred to as mold clamping). ), the guide hole 10c drilled in the movable side insert 10
is inserted into the insert to guide the relative positions of both inserts to be constant.

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

Reference numeral 13 denotes a plate-shaped stopper, and the guide pin 12a is inserted through a through hole 13a, which is a split mold retaining part, and has an inner diameter slightly larger than the outer diameter of the guide pin 12a, and the narrow diameter part 12b is inserted when the mold is clamped. Located corresponding to
The distal end protrudes from the pressing surface 10b, and the proximal end is biased by a compression spring 14 in a direction protruding from the pressing surface 10b, and is disposed in the movable insert 10. Note that when the tip of the stopper 13 is pushed against the bias of the compression spring 14 to a position flush with 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
, and 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 moves both connected inserts between the mold stocker outside the molding machine and the mold body of the molding machine.

Note that the shape of the hook portion of the guide pin 12a and the stopper 13 in the above-mentioned embodiments may be other shapes, such as a through hole drilled in the guide pin 12a and a pin inserted through the through hole so as to move forward and backward. Furthermore, the location of the stopper 13 is not limited to that in the embodiment, and an independent cylinder may be used as the mechanism for driving the stopper 13.

In this way, according to the present invention, since the two molds are connected using the guide pin that guides the two molds, which are split molds, the locking can be performed with a simple mechanism, and the molding machine can be It is also possible to automatically install and remove the molds, and when storing both molds, they do not separate and are locked with their parting surfaces aligned to prevent damage to cavities, runners, etc. It has great effects, such as not having to do anything.

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 about.

[Brief explanation of drawings]

FIG. 1 is a front view showing the parting surface of a molding die according to the present invention, FIG. 2 is a cross-sectional view taken along line A-A, and FIG. 3 is a back 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 a handling hole 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 front 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... Connecting tool, 3... Fixing tool, 3a... Hydraulic cylinder, 3b... Pressing part, 3c... Connecting tool,
4...Insulating layer, 4a...Bolt, 4b...Block, 10...Movable side insert, 10a...Connection part, 1
0b...Press surface, 10c...Guide hole, 11...
Fixed side insert, 11a...Connection part, 11b...Press 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...
nail.

Claims (1)

[Scope of Claims] 1. A split mold locking mechanism for integrally connecting a nesting mold consisting of at least two split molds removed from a mounting portion of a mold body, the locking mechanism comprising: at least one guide pin whose base end is fixed to one of the split molds and whose tip protrudes from the parting surface and is inserted into a guide hole provided in the other split mold so as to be freely advanced and retractable; A latching portion provided at a protruding position, and a split latching portion provided on the other split mold, protruding freely forward and backward into the guide hole and coming into contact with and separating from the wall surface of the latching portion of the guide pin, When attaching the integrally connected split molds to the mounting part of the mold body, the protruding end protruding from the wall surface of the split mold is pressed against the wall surface of the mounting part of the mold body, and the split molds are attached to the mounting part of the mold body. A split die locking mechanism characterized by comprising a stopper for releasing the split die connection.