JP2011161721A - Mold for molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold for molding which is capable of reducing the number of parts, making the mold small-sized, lightweight, reducing cost and is provided with a clamping mechanism. <P>SOLUTION: The mold for molding is provided with a clamping mechanism for holding the clamp of the mold so that an upper mold 2 and a lower mold 1 are not opened at the time of clamping both molds and for releasing holding the clamp. The mold clamping mechanism comprises three structural components of a guide pin 3 fixed to the upper mold, a clamp block 4 built-in inside the lower mold to be rotated and a block rotation part 5 which engages to the clamp block by inserting from lower part of the lower mold, and is made to rotate the clamp block. The tip of the guide pin is inserted in the clamp block in closing the mold and the mold clamping is carried out by rotating the clamp block by the block rotation part and engaging the guide pin with the clamp block. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a molding die suitable for a mold transport molding machine that sequentially transports several molding dies to each station and divides the molding operation.

  In general, in a mold conveyance type molding machine, as shown in FIG. 1, several pieces of gold are sent to each station S1 to S10 for performing various operations such as setting of insert parts, mold closing, injection, cooling, mold opening, and taking out a molded product. By sequentially conveying the mold M, these molding operations are divided. Then, the mold M from which the molded product has been taken out is returned to the initial insert component setting work station S1. By dividing the molding operation into a closed cycle operation in this way, the cycle time of the molding operation can be shortened.

  In such a mold conveyance molding machine, molten resin is injected from the molding machine into the cavity of the mold M at the injection station S2, and the mold M is cooled from the injection station S2 immediately after the gate of the mold M is sealed. Since it is transported to the stations S3 and S4, a mechanism (clamping mechanism) for self-clamping the mold itself is necessary to prevent the mold M from being opened by the resin pressure in the mold M during cooling. .

  As a mechanism for self-clamping in a mold used in a mold conveyance molding machine, a mechanism disclosed in Patent Document 1 has been known. This conventional mechanism is composed of a clamp body, a clamp bar, a clamp block, a release bar, a release pin, etc., the clamp body is fixed to the lower mold, the clamp bar is fixed to the upper mold, When the upper die is closed, a clamp bar is inserted into a groove formed in the clamp body in the vertical direction. A clamp block slidable in the lateral direction is accommodated in the clamp body, and protrudes into the groove from the lateral direction by a spring. The clamp main body is provided with a release bar that restricts the lateral movement of the clamp block.

  In such a conventional clamp / unclamp mechanism, the upper and lower molds are closed in the clamped state, and the clamp bar is inserted into the groove of the clamp body. On the other hand, the clamp block is urged by a spring to advance, its tip protrudes into the groove, and enters the engagement recess of the clamp bar, so that the clamp block engages with the clamp bar, and the upper mold and the lower mold are separated. It is supposed to be locked.

  In the unclamping operation, the ejector rod raises the release bar. As a result, the clamp block is retracted by the biasing force of the spring and retracts from the groove of the clamp body. As a result, the engagement between the clamp bar and the clamp block is released.

JP 2007-216413 A

  As described above, the conventional clamping / unclamping mechanism (clamping mechanism) has a problem that the cost of the mold is increased because the number of parts constituting the mechanism is large, the mold is large, and the mold weight is increased. In addition, since the clamp block operates linearly, there is a problem that the component size increases by the stroke. These problems are a major drawback of a mold transport type molding machine that has a large number of molds and transports the molds.

  Further, since the drive of the clamp block is a spring, it is not known whether the clamp block and the clamp bar are combined or the clamp block is moving forward, and it is necessary to check by providing another mechanism.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a mold clamping mechanism that can reduce the number of parts, reduce the size and weight of the mold, and reduce the cost of the mold. It is to provide a molding die provided.
A further object of the present invention is to provide a molding die capable of easily checking whether or not clamping (clamping) is established.

The present invention provides, as means for solving the above-mentioned problems, a molding die described in each of the claims.
The molding die according to claim 1 holds the mold so that the parting surface L between the upper mold 2 and the lower mold 1 is not opened when the lower mold 1, the upper mold 2 and the mold are closed. And a mold clamping mechanism for releasing the clamping hold. The mold clamping mechanism is fixed to the upper mold 2 and the guide pin 3 whose tip is formed in an inverted T shape is rotatably embedded in the lower mold 1. The clamp block 4 is inserted from the lower side of the lower mold 1 and a block rotating part 5 that rotates the clamp block 4. The tip of the guide pin 3 is inserted into the clamp block 4 when the mold is closed. By rotating the clamp block 4 by the block rotating part 5, the guide pin 3 and the clamp block 4 are engaged, and the upper mold and the lower mold are clamped. Thereby, the number of parts of the mold clamping mechanism can be reduced, the molding die can be reduced in size and weight, and the cost of the molding die can be reduced. Moreover, the number of drive sources can be reduced as a system by providing the facility side with the function of providing the drive source of the clamp block 4 for each mold. Furthermore, the clamping mechanism can be made compact by changing the drive of the clamp block 32 from the linear system to the rotational system.

In the molding die according to claim 2, a slit or hole 41 capable of receiving the tip of the guide pin 3 is formed on the upper surface of the clamp block 4, and the inside thereof receives the tip of the guide pin 3. A space 42 is formed so that the clamp block 4 can be rotated in a state where the clamp block 4 is rotated, and a fitting convex portion 43 that fits with the fitting concave portion 51 of the block rotating component 5 is provided in the diameter direction below the clamp block 4. Is formed in a straight line. Thereby, the clamp block 4 can be rotated by the block rotating component 5 in a state where the tip of the guide pin 3 is inserted into the clamp block 4.
In the molding die according to claim 3, the inverted T-shape of the guide pin 3 is composed of a horizontal portion 31 and a vertical portion 32, and the upper surface of the horizontal portion 31 is divided into two surfaces by the vertical portion 32, respectively. The taper A surface 31a and the taper B surface 31b are formed, and both are inclined surfaces that are opposite to each other. With this, the guide pin 3 and the clamp block 4 are firmly connected by the rotation of the clamp block 4. Can be engaged.

In the molding die according to claim 4, the space 42 of the clamp block 4 is two arc-shaped spaces 42A and 42B communicating with the slit 41, and the ceiling of each space is a tapered surface and is engaged A The horizontal portion 31 on the taper A surface side of the guide pin enters the first space 42A, and the other second space 42B. Is such that the horizontal portion 31 on the taper B surface side of the guide pin enters, and the guide pin and the clamp block are in contact with each other at the taper surfaces and are firmly engaged. Is fastened with a kind of wedge action (or screw-like action).
The molding die according to claim 5 is to clamp the upper mold 2 and the lower mold 1, and to determine whether the guide pin 31 and the clamp block 32 are fastened or not is to measure the rotation angle θ of the clamp block 32. This makes it possible to determine whether or not the tightening force is normal, and the taper surface is worn, foreign matter is on the taper surface, or the mold assembly accuracy is not achieved. The cause of contact abnormality such as can be known at an early stage.

It is a conceptual diagram of the transfer molding machine in which the molding die of the present invention is used. It is a conceptual perspective view explaining the upper mold | type and lower mold | type of the metal mold | die which is embodiment of this invention. It is a schematic sectional drawing of the upper mold | type and lower mold | type of the metal mold | die which is embodiment of this invention. It is an exploded view of the mold clamping mechanism of the molding die which is an embodiment of the present invention. It is a figure explaining operation | movement (a)-(c) of the mold clamping mechanism of the metal mold | die which is embodiment of this invention. It is a figure explaining the determination of the quality of the clamping (clamp) in the clamping mechanism of the molding die which is embodiment of this invention.

  Hereinafter, a molding die according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a conceptual diagram illustrating the overall configuration of a mold transport molding machine using the molding die of the present invention. For example, as shown in FIG. 1, ten stations S1 to S10 arranged in two rows are provided, and resin molding is performed by moving the mold M between the stations S1 to S10. That is, the insert part is put into the cavity in the mold M at the station S1, and the mold M is closed. Next, the closed mold M is transferred to the station S2, and after the mold M is clamped (clamped) by a mold clamping mechanism which will be described in detail later, the mold M is molded by a molding machine. And the molten resin is filled into the cavity. In this way, at the station S2, the mold M is clamped and the molten resin is injected from the molding machine.

  The mold M in which the molten resin has been injected and filled is sent to the next stations S3 and S4, where the filled resin is cooled. Next, in the station S5, the mold clamping of the mold M is released (unclamped) by the mold clamping mechanism, and the mold M is opened in the station S6. Further, the molded product is ejected from the mold by the ejector pin by the ejector mechanism. In the station S7, the molded product is taken out from the mold. The mold M from which the molded product has been taken out is conveyed through the stations S8 to S10 and returned to the original station S1. Molding is performed by repeating such a closed cycle. The mold M moves between the stations by, for example, rails.

  FIG. 2 is an exploded perspective schematic view of a molding die provided with a mold clamping mechanism according to an embodiment of the present invention, and FIG. 3 is an exploded sectional schematic view of the molding die provided with the same mold clamping mechanism. It is. The molding die M of the present invention comprises an upper mold 2 and a lower mold 1, and each component of the mold clamping mechanism, which is a feature of the present invention, is separately attached to the upper mold 2 and the lower mold 1. Yes. A guide pin 3 that is a component part of the mold clamping mechanism is attached to the upper mold 2 by a fixture such as a bolt 6. In FIGS. 2 and 3, four guide pins 3 are provided. However, the number is determined as appropriate, and the number of guide pins 3 may be such that the mold M is sufficiently clamped.

  At a position corresponding to the guide pin 3 of the lower mold 1, a through hole 11 for inserting the guide pin 3 attached to the upper mold 2 when the mold is closed and clamped is formed. The number of through holes 11 is equal to the number of guide pins 3. A clamp block 4 that is a component part of the mold clamping mechanism is incorporated in an intermediate portion of the through hole 11 so as to be freely rotatable (turnable). The clamp block 4 is assembled or embedded at a position where the tip of the guide pin 3 is accommodated in the clamp block 4 when the upper mold 2 and the lower mold 1 are closed. This position is formed larger than the diameter of the through hole 11. In addition, a part of the cavity 9 is formed in each of the upper mold 2 and the lower mold 1, and the cavity 9 is formed by closing the upper mold 2 and the lower mold 1.

  A recess 12 is formed on the lower surface corresponding to the cavity 9 of the lower mold 1, and an ejector plate 8 is provided in the recess 12. A plurality of ejector pins 7 that pass through the inside of the lower mold 1 and reach the cavity 9 are attached to the ejector plate 8. An ejector drive mechanism (not shown) that moves the ejector plate 8 and the ejector pin 7 up and down is installed, for example, in the lower part of the station M where the mold M is placed. By ejecting the ejector pin 7 into the cavity 9 by the ejector driving mechanism, the molded product is separated from the mold, and the molded product can be easily taken out from the mold.

  In the mold M, the mold M is clamped and held so that the closed surfaces L of the upper mold 2 and the lower mold 1 are not opened by the internal resin pressure filled in the cavity 9. For example, four mold clamping mechanisms are provided around the mold M. The details of the mold clamping mechanism will be described below with reference to FIGS.

  The mold clamping mechanism is composed of three components: a guide pin 3, a clamp block 4, and a block rotating component 5. As described above, the guide pin 3 is fixed to the upper mold 2 by a fixing tool such as a bolt 6. The tip of the guide pin 3 has an inverted T shape, and the upper surface of the inverted T-shaped horizontal portion 31 is divided into two surfaces 31a and 31b by a vertical portion 32 at the center of the inverted T shape. Thus, a taper A surface 31a and a taper B surface 31b are formed. The taper A surface 31a and the taper B surface 31b have opposite slopes. In FIG. 3, the taper A surface 31a has a lower front side and a lower taper B surface 31b, whereas the taper A surface 31a has a lower front side. It has a reverse slope that increases. The length of the horizontal portion 31 is shorter than the length of a slit 41 formed in the clamp block 4 to be described later, and the width thereof is narrower than the width of the slit 41.

  The clamp block 4 which is a component part of the mold clamping mechanism is incorporated in the lower mold 1 so as to be rotatable (turnable) as described above. The clamp block 4 has a substantially cylindrical shape as a whole, and the diameter thereof is larger than the diameter of the through hole 11 of the lower mold 1. On the upper surface of the clamp block 4, a slit or a rectangular hole 41 having a width that allows the horizontal portion 31 of the guide pin 3 to pass therethrough is formed, and at the intermediate portion of the clamp block 4, As the space 42 communicating with the slit 41, two arc-shaped spaces 42A and 42B are formed in the circumferential direction. The engagement A surface 42a and the engagement B surface 42b, which are the ceilings of the two arcuate spaces 42A and 42B, have a high side (frontage side) communicating with the slit 41 and go deeper (away from the communication side). ), The taper surface becomes lower. The horizontal part 31 on the side having the taper A surface 31a of the guide pin 3 enters the first arcuate space 42A on one side, and the guides 3 enter the guide part 3 on the other arcuate space 42B on the other side. The horizontal portion 31 on the side having the taper B surface 31b of the pin 3 enters. Therefore, the inclination angles of the taper A surface 31a and the taper B surface 31b are substantially equal to the inclination angles of the engagement A surface 42a and the engagement B surface 42b.

  A cylindrical fitting block or key 43 is formed on the lower surface of the cylindrical clamp block 4 in the diameter direction through the center. Preferably, it is desirable that the extending direction of the fitting convex portion 43 coincides with the extending direction of the slit 41 formed on the upper surface of the clamp block 4. The fitting convex portion 43 is concavo-convexly fitted into a fitting concave portion of the block rotating component 5 described later during operation.

  A block rotating component 5 which is a component of the mold clamping mechanism is for rotating (turning) the clamp block 4. The block rotating component 5 has a cylindrical shape as a whole, and its diameter is smaller than the diameter of the through hole 11 so that it can freely enter and exit through the through hole 11 of the lower mold 1. Further, a fitting recess or key groove 52 is formed in the tip surface 51 of the block rotating component 5 in a straight line shape in the diameter direction through the center. The block rotating component 5 is coupled to a facility-side rotation (rotation) driving mechanism (not shown), and is provided in the stations S2 and S5 or S6 that perform mold clamping and mold clamping release.

  The operation of the mold clamping mechanism having the above configuration will be described with reference to FIG. FIG. 5A shows the relationship between the guide pin 3, the clamp block 4, and the block rotating component 5 in the mold open state. That is, the guide pin 3 is disengaged from the clamp block 4 and is waiting above the clamp block 4. At this time, it is preferable that the direction in which the horizontal portion 31 of the inverted T-shaped tip of the guide pin 3 extends horizontally coincides with the direction in which the slit 41 formed in the clamp block 4 extends. . Further, the block rotating component 5 is also released from the concave-convex fitting with the clamp block 4.

  FIG. 5B shows the relationship between the three of the guide pin 3, the clamp block 4, and the block rotating component 5 in the mold closed state. The guide pin 3 is lowered along with the upper die 2, and the horizontal portion 31 at the tip thereof is inserted from above the upper die 2 through the through hole 11 and the slit 41 of the clamp block 4, and the arc-shaped space 42 </ b> A, It stops in contact with the bottom surface of the slit 41, which is the position facing the surface 42B. On the other hand, the block rotating component 5 is inserted into the through hole 11 from below the lower die 1 and rises, and the fitting recess 52 formed on the front end surface 51 of the block rotating component 5 is fitted to the lower surface of the clamp block 4. The concave and convex portions 43 and the concave and convex portions are fitted.

  FIG. 5C shows the relationship between the guide pin 3, the clamp block 4, and the block rotating component 5 in the state of clamping (clamping). When the block rotation component 5 is rotated (rotated) counterclockwise by a rotation (rotation) drive mechanism (not shown) in the three states when the mold is closed in FIG. The clamp block 4 is rotated together (rotated) counterclockwise. As the clamp block 4 rotates, the horizontal portion 31 having the two taper A surfaces 31 a and the taper B surface 31 b of the guide pin 3 enters the two arc-shaped spaces 42 A and 42 B of the clamp block 4. The taper A surface 31a of the guide pin 3 is the engagement A surface 42a of the first space 42A of the clamp block 4, and the taper B surface 31b of the guide pin 3 is the engagement B surface of the second space 42B of the clamp block 4. The guide pin 3 and the clamp block 4 are firmly engaged with each other by making firm contact with the respective b. In this way, the guide pin 3 and the clamp block 4 are firmly engaged by a kind of wedge action (or screw-like action), and the mold clamping is completed.

  For mold clamping release (unclamping) and mold opening, the operations of (a), (b) and (c) of FIG. 5 may be performed in the reverse order. That is, in FIG. 5C, the block rotating component 5 is rotated (rotated) in the clockwise direction, which is the reverse rotation, and the state shown in FIG. 5B is obtained. Thereby, the mold clamping is released. Next, the concave / convex fitting between the clamp block 4 and the block rotating part 5 is released, and both are separated. Further, the upper die 2 is opened from the lower die 1 and the guide pin 3 is raised and separated from the clamp block 4 to be in the state shown in FIG.

  FIG. 6 is a cross-sectional view of a main part for explaining a method (or mechanism) for determining whether the guide pin 3 and the clamp block 4 are normally engaged and exhibit a sufficient tightening force (clamping force). It is a figure and a partial top view. (A) is a case where the determination is good, and (b) and (c) are cases where the determination is bad. That is, in FIG. 6A, the taper A surface 31a of the guide pin 3 and the engagement A surface 42a of the clamp block 4 (and the taper B surface 31b of the guide pin 3 and the engagement B surface 42b of the clamp block 4) are formed. The case where the tapered surfaces are in normal contact with each other and a predetermined tightening force (clamping force) is secured is shown. At this time, the clamp block 4 is rotated (rotated) by an angle θ.

In FIG. 6B, foreign matter is present between the taper A surface 31b and the engagement A surface 42a (or the taper B surface 31b and the engagement B surface 42b), and sufficient contact between the two cannot be obtained. Shows the case. Further, at this time, it is indicated that the clamp block 4 rotates only by an angle θ ₁ smaller than the rotation (rotation) angle θ in the normal case.

In FIG. 6C, the taper A surface 31 and the engagement A surface 42a (or the taper B surface 31b and the engagement B surface 42b) or both of the taper surfaces are worn, and the clamp block 4 is excessively rotated. The case where it became is shown. That is, the clamp block 4 rotates to an angle θ ₂ larger than the rotation angle θ in the normal case.

  In this way, the rotation angle of the clamp block 4 is measured, and the engagement between the guide pin 3 and the clamp block 4 is normally performed depending on whether or not the measurement result is within a specified value, and a predetermined tightening force is obtained. It can be determined whether it is secured. In order to measure the rotation angle of the clamp block 4, for example, an encoder (not shown) may be attached to the clamp block 4 to detect the rotation angle of the clamp block 4.

  In the mold clamping mechanism described above, the clamp block 4 is rotated counterclockwise to be engaged with the guide pin 3 to secure a clamping force. However, the clamp block 4 is rotated clockwise. It is also possible to make it engage with the guide pin 3. In this case, however, the taper A surface 31a and the taper B surface 31b of the guide pin 3 are reversed in direction, and the two arcuate spaces 42A and 42B of the clamp block 4 also sandwich the slit 41, respectively. It is necessary to form on the opposite side.

  Further, the concave / convex fitting between the clamp block 4 and the block rotating part 5 is performed by forming a fitting convex part 43 on the clamp block 4 side and a fitting concave part 52 on the block rotating part 5 side. Conversely, a fitting recess may be formed on the clamp block 4 side, and a fitting protrusion may be formed on the block rotating component 5 side.

  In the above description, the fitting convex portion and the fitting concave portion are described as being like a key and a key groove, but the fitting convex portion on one surface is a columnar portion having a regular polygonal cross section. It is also possible to form a fitting recess on the other surface and form a hole with the same regular polygonal cross section at the center, and to fit both of them in a concave-convex manner.

As described above, in the present invention, the mold clamping mechanism can be composed of three parts, that is, a guide pin, a clamp block, and a block rotating part, so that the number of parts can be reduced, the mechanism can be simplified, and the manufacturing cost can be reduced. Can do. Further, in the present invention, the clamping operation of the guide pin and the clamp block can be performed by a rotation (rotation) operation instead of a linear operation, so that the size of the parts and the mold can be reduced, and a large number of molds can be manufactured. This is a great advantage for a mold conveying type molding machine that uses and conveys a mold.
Furthermore, in the present invention, it is possible to determine the quality of the clamping by the mold clamping mechanism by detecting the rotation (rotation) angle of the clamp block. Therefore, it is not necessary to provide a special mechanism for checking and the determination is easy. It is.
Further, in the present invention, the block rotation parts are provided on the equipment side, so that the drive source of the clamp block is provided for each die, for example, the equipment side of the station S2 and the station S5 or S6 is driven as a system. The number of sources can be reduced.

DESCRIPTION OF SYMBOLS 1 Lower mold | type 11 Through-hole 2 Upper mold | type 3 Guide pin 31 Horizontal part 31a Taper A surface 31b Taper B surface 32 Vertical part 4 Clamp block 41 Slit or hole 42 Space 42A 1st space 42a Engagement A surface 42B 2nd space 42b Engagement B surface 43 Fitting convex part or key 5 Block rotating part 51 Tip face 52 Fitting concave part or key groove M Mold S1 to S10 Station

Claims (5)

Lower mold (1), upper mold (2) movable with respect to the lower mold, and mold clamping and holding so that the parting surface (L) between the upper mold and the lower mold does not open when the mold is closed In addition, in a mold for molding a resin product, including a mold clamping mechanism that releases the mold clamping hold,
The mold clamping mechanism is
A guide pin (3) fixed to the upper mold (2) and having an inverted T-shaped tip;
A clamp block (4) rotatably incorporated in the lower mold (1);
A block rotating part (5) that is inserted from below the lower mold (1), engages with the clamp block (4), and rotates the clamp block;
When the mold is closed, the tip of the guide pin (3) is inserted into the clamp block (4), and the clamp block (4) is rotated by the block rotating component (5). Accordingly, the guide pin (3) and the clamp block (4) are engaged, and the upper mold and the lower mold are clamped.   A slit or hole (41) that can receive the tip of the guide pin (3) is formed on the upper surface of the clamp block (4), and the inside thereof is in a state in which the tip of the guide pin is received. A space (42) in which the clamp block can be rotated is formed, and the lower surface of the clamp block (4) is unevenly fitted with the fitting recess (52) of the block rotating component (5). The molding die according to claim 1, wherein the fitting convex portion (43) is formed linearly in the diameter direction.   The inverted T-shape of the guide pin (3) is composed of a horizontal part (31) and a vertical part (32), and the upper surface of the horizontal part (31) is divided into two surfaces by the vertical part (32). The molding die according to claim 2, wherein a taper A surface (31a) and a taper B surface (31b) are formed respectively, and both are inclined surfaces opposite to each other.   The space of the clamp block (4) is two arc-shaped spaces (42A, 42B) communicating with the slit (41), and the ceiling of each space is a tapered surface and an engagement A surface ( 42a) and the engagement B surface (42b), and the horizontal portion (31) on the taper A surface side of the guide pin enters the first space (42A), In the other second space (42B), the horizontal portion (31) on the taper B surface side of the guide pin is inserted, and the guide pin (3) and the clamp block (4) are arranged. 4. The molding die according to claim 3, wherein the taper surfaces come into contact with each other and are firmly engaged.   The determination of whether the guide pin (3) that clamps the upper mold and the lower mold is tight or not is performed by measuring the rotation angle θ of the clamp block (4). The molding die according to any one of claims 1 to 4, wherein the molding die is formed.

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