KR100816615B1 - Die clamping apparatus - Google Patents

Abstract

The present invention provides a die clamping device capable of reducing the size of a tie bar retracting mechanism, that is, a die clamping device provided on a stationary die plate, a movable die plate, a tie bar retractable from a stationary die plate, and a moving part engaged with the tie bar. A retracting cylinder for moving a moving part provided in a movable die plate in a retracting direction, and a hook system for fastening a tie bar with the moving part. When the second engagement portion and the second engagement portion are engaged, the drive mechanism moves the movable die plate in the die opening direction and then releases engagement of the second engagement portion and the second engagement portion. When the engagement is formed by the hook system, the retraction cylinder moves the moving part in the retraction direction.

Die Clamping Device, Removable Die Plate, Retracting Cylinder, Tie Bar

Description

Die Clamping Device {DIE CLAMPING APPARATUS}

1 is a cross-sectional view showing a die clamping device of one embodiment of the present invention in a die open state;

Fig. 2 is a sectional view showing the die clamping device in a die closed state.

FIG. 3 is a sectional view of the die clamping device of FIG. 1 with the tie bar retracted; FIG.

Fig. 4 is a sectional view showing the die clamping device of Fig. 1 when the retraction of the tie bar is finished.

FIG. 5 is a side view of the retracting cylinder and hook system of the die clamping device of FIG. 1; FIG.

6A and 6B are front views illustrating the retracting cylinder and hook system of the die clamping device of FIG.

7A and 7B show the effect of the die clamping device of FIG.

8A and 8B show the effect of the die clamping device of FIG.

<Description of the symbols for the main parts of the drawings>

A1: die opening direction (A1)

A2: die closing direction (A2)

B1: Retraction direction (B1)

B2: Insertion direction (B2)

d22: distance (d22)

d21: distance (d21)

P1: die opening direction (P1)

P2: Die closing direction (P2)

P5: first retracted position P5

P11: intermediate position (P11)

1: die clamping device (1)

5: base (5)

6: fixed die plate (6)

7: removable die plate (7)

8: Thai Baa (8)

8U: Thai Bar (8U)

8a: first to-be-engaged portion 8a

8b: second to-be-engaged portion 8b

8c: end 8c

9: drive mechanism (9)

10: clamping cylinder (10)

14: slide plate (14)

15: screw shaft (15)

16: moving part (16)

17: motor (17)

18: Encoder (18)

21: ring piston (21)

21a: piston portion 21a

21b: rod portion 21b

22: cylinder chamber 22

31: first coupling portion 31

32: second coupling portion 32

35: first coupling drive unit 35

36: second coupling driver 36

41: retracting cylinder 41

41 ': Retract cylinder 41'

42: piston 42

43: cylinder portion 43

44: piston rod (44)

45: moving part 45

45a: base portion 45a

45b: flange portion 45b

45c: coupling groove (45c)

47: bolts (47)

51: hook system (51)

52: hook plate (52)

52a: cutout 52a

52b: long hole (52b)

53: plate type elevator cylinder (53)

54: mounting plate (54)

55: guide pin (55)

55a: base portion 55a

55b: disc-shaped flange portion 55b

56: support plate 56

57: cylinder portion 57

58: piston rod (58)

61: control unit (61)

501: fixed die (501)

502: removable die 502

The present invention relates to a die clamping device for use in die cast machines, molding machines and the like, and more particularly to a die clamping device in which a tie bar is retractable.

In order to facilitate exchange of the die, a die clamping device is known which has a retractable tie bar suspended between a movable die plate and a stationary die plate. Japanese Laid-Open Patent Publication No. 2003-334648 discloses a die clamping device having a retracting cylinder provided on a movable die plate to retract a tie bar. The piston rod of the retracting cylinder is fixed to the tie bar. In such a die clamping device, when the movable die plate is in the die open position, moving the tie bar to the movable die plate by the retracting cylinder causes the tie bar to retract from the stationary die plate. Japanese Laid-Open Patent Publication No. 2005-144802 discloses a technique using a retracting cylinder identical to the cylinder of Japanese Laid-Open Patent Publication No. 2003-334648 as a die opening and closing cylinder. Japanese Utility Model Registration 2574639 discloses a die clamping device that provides a retracting cylinder movable in a retracting direction of a tie bar with respect to a link housing, and a coupling member for engaging the interlocking housing and the retracting cylinder with each other. By repeatedly operating the retraction cylinder and the engaging member alternately, it is possible to separate the movement of the tie bar into two operations by the retraction cylinder, so that the stroke of the retraction cylinder is smaller than the amount of movement of the tie bar during retraction.

In the techniques of Japanese Patent Laid-Open Publication No. 2003-334648 and Japanese Patent Laid-Open Publication No. 2005-144802, the tie bar is retracted only by the retracting cylinder, and therefore, the retracting cylinder requires a stroke equivalent to the amount of movement of the tie bar during the retraction, thereby retreating. The cylinder must be manufactured large. In the technique of Japanese Utility Model No. 2574639, it is necessary for the retracting cylinder to be provided to be movable relative to the die clamping device, which complicates its configuration.

It is therefore an object of the present invention to provide a die clamping device capable of making a tie bar retractor compact.

According to a first aspect of the present invention, there is provided a fixed die plate, a movable die plate movable in an open and closed direction with respect to the fixed die plate, and retractable from the fixed die plate and into the movable die plate and the fixed die plate. A tie bar to be inserted, a die opening and closing portion for moving the movable die plate in the open and closed directions, and a moving portion provided on the movable die plate and capable of engaging with the tie bar, and retracting the tie bar And a retracting portion for moving said moving portion relative to said movable die plate in a direction, and a retracting portion for engaging said moving portion and said tie bar and releasing the engaging operation, said retracting engaging portion being said The fixed die plate The moving part and the tie bar can be engaged when not retracting from the moving part, and the moving part is in a restricted position on the insertion direction side of the tie bar in the moving range of the moving part, and the movable die plate is moved of the movable die plate. It is in the position on the die closing direction side from the restriction position on the die opening direction side of the range.

Preferably, the retracting engaging portion can engage the moving portion and the tie bar when the tie-by is not retracted from the stationary die plate, the moving portion being in a restricted position in the insertion direction of the tie bar in the moving range of the moving portion. The movable die plate is in the restricted position of the die closing position in the range of movement of the movable die plate.

Preferably, the retracting engaging portion engages and releases the engaging operation with the end of the tie bar protruding from the movable die plate toward the retracting direction side.

According to a second aspect of the present invention there is provided a fixed die plate, a movable die plate movable in an open and closed direction with respect to the fixed die plate, and retractable from the fixed die plate and into the movable die plate and the fixed die plate. A tie bar to be inserted, a die opening and closing portion for moving the movable die plate in the open and closed directions, and a moving portion provided on the movable die plate and capable of engaging with the tie bar, and retracting the tie bar A retreat for moving the moving part with respect to the movable die plate in a direction; a retracting part for engaging the moving part and the tie bar and releasing the engaging operation; and opening and closing the die in the engaged state through the retracting part. The teeth in the direction of the additional die opening A die clamping apparatus including the retraction engaging portion, the controller for controlling the die gaebangwa closing portion, and retracting operation portion is provided to move the formula die plate and adapted to move the tie-bar to the retreat portion retraction direction.

According to a third aspect of the present invention, there is provided a fixed die plate, a movable die plate movable in an open and closed direction with respect to the fixed die plate, and retractable from the fixed die plate and into the movable die plate and the fixed die plate. A tie bar to be inserted, a movable die plate engaging portion for engaging and releasing the engaging operation of the movable die plate and the tie bar, a die opening and closing portion for moving the movable die plate in the open and closed directions, and a tie bar; And a retreating portion for moving the moving portion in a retracting direction of the tie bar, a retracting portion for fastening the moving portion and the tie bar, and a movable die plate engaging portion. The die in the open state and The retracted portion moves the movable portion in the retracting direction while a chain portion moves the movable die plate in the die opening direction, and then the retracting portion is released by the movable die plate engaging portion and engaged by the retracting engaging portion. A die clamping device is provided that includes a control for controlling operation of the movable die plate engaging portion, the retracting engaging portion, the die opening and closing portion, and the recessing portion.

Preferably, the recess is provided in the movable die plate.

Preferably, the retracting portion is a cylinder device having a piston coupled to the moving portion and a cylinder portion housing the piston that can move in the retracting direction of the tie bar.

Preferably, the retracting engagement portion has an engaged portion having a coupled groove open in a direction perpendicular to the retraction direction of the tie bar, and a coupling portion insertable in the engaged groove and arranged to be perpendicular to the retraction direction of the tie bar. And a plate driver for inserting and retracting the plate member into and out of the engaged groove.

According to the invention, it is possible to reduce the size of the tie bar retraction system of the die clamping device.

These and other objects and features of the present invention will become more apparent from the following description of the preferred embodiments presented with reference to the accompanying drawings.

Preferred embodiments of the invention will be described in detail below with reference to the accompanying drawings.

1 to 4 are cross-sectional views showing the die clamping device 1 according to the first embodiment of the present invention. FIG. 1 shows the die open state, FIG. 2 shows the die closed state, FIG. 3 shows the middle of the tie bar retraction, and FIG. 4 shows the completion of the tie bar retraction.

For example, the die clamping device 1 is configured as a die clamping device for use in a die cast machine and includes a base 5, a stationary die plate 6 and a movable die plate 7 facing each other on the base 5, A plurality of tie bars (8U and 8D, hereinafter in some cases simply referred to as “tie bars 8”) passing through the stationary die plate 6 and the movable die plate 7, removable in the open and closed directions A driving mechanism (die opening and closing portion 9) for moving the die plate 7 and a clamping cylinder (die clamping portion) 10 for generating a clamping force.

The stationary die plate 6 is fixed to the base 5. On the surface (die mounting surface) of the stationary die plate 6 facing the movable die plate 7, for example, a T-shaped groove not shown, into which the bolt head can be inserted and engaged, holds the stationary die 501. It is provided to make it possible.

The movable die plate 7 is provided on the base 5 so as to be movable in the die opening direction A1 and the die closing direction A2. For example, the movable die plate is disposed on a slide plate 14 having a flat mounting surface provided on the base 5, thereby sliding in the open and closed directions with respect to the base 5. On the surface (die mounting surface) of the movable die plate 7 facing the stationary die plate 6, the movable die can be held in the same manner as the stationary die plate 6.

By closing the fixed die 501 held in the stationary die plate 6 and the movable die 502 held in the movable die plate 7, a cavity is formed between the fixed die 501 and the movable die 502. . For example, the fixed die 501 and the movable die 502 are mounted at approximately the center of the fixed die plate 6 and the movable die plate 7.

The movable die plate 7 is movable between the die open position shown in FIG. 1 and the die closed position shown in FIG. The die opening position P1 is the same position as the limit position on the die opening direction A1 side in the moving range of the movable die plate 7. However, this may be set more on the die closing direction A2 side than on the limit position of the die opening direction A1 among the moving range of the movable die plate 7. Hereinafter, the die opening position P1 is set at the limit position of the die opening direction A1 among the moving ranges of the movable die plate 7. The limit position in the moving range of the movable die plate 7 is determined by the configuration of the drive mechanism 9, the slide plate 14, and the like.

In addition, the die closing position P2 is determined by the thickness of the fired fixed die 501 and the movable die 502. However, the range of positions that can be the die closing position can be identified by the configuration of the drive mechanism 9, the configuration of the slide plate 14, the setting range of the second to-be-engaged portion 8b to be mentioned later, and the like. Hereinafter, in FIGS. 1 to 4, the die closing position P2 determined by the thickness of the fixed die 501 and the movable die 502 mounted in the die clamping apparatus 1 may be the die closing position. It is the limit position of die closing direction A2 in a range. That is, this is the limit position in the die closing direction in the moving range of the movable die plate.

For example, the tie bar 8 comprises two tie bars 8U on the top side and two tie bars 8L on the bottom side for all four. They pass through the four corners of the stationary die plate 6 and the movable die plate 7. For example, the tie bar 8 has a length approximately equal to that of the base 5 and includes a fixed die plate 6 provided at the end of the base 5 and a movable die plate 7 located in the die open position P1. Can pass. That is, they have a length such that the movable die plate 7 can be guided between the die open position P1 and the die closed position P2.

For example, the drive mechanism 9 consists of a so-called ball screw mechanism and is mounted in the base 5. In particular, the drive mechanism 9 includes a moving part 16 in which a screw shaft 15 extending in the open and closed directions is spiraled, a motor 17 for rotating the screw shaft 15, and rotation of the motor 17. And an encoder 18 for detecting.

The rotation of the motor 17 is changed by the linear movement of the moving part 16 in the opening and closing direction via the screw shaft 15. The moving part 16 is fixed to the movable die plate 7. The movable die plate 7 moves in the open and closed directions by the movement of the moving part 16. The position of the movable die plate 7 is identified based on the rotation speed of the motor 17 detected by the encoder 18.

Four clamping cylinders 10 are provided corresponding to four die bars 8. Each has a ring piston 21 into which a tie bar 8 is inserted, and the cylinder chamber 22 holds at least some ring piston 21.

The ring piston 21 has a piston portion 21a slidable in the cylinder chamber 22 and a rod portion 21b having a diameter smaller than the piston portion 21a. The piston portion 21a divides the cylinder chamber 22 into two cylinder chambers. The two cylinder chambers each have ports not shown for supplying or draining pressurized oil serving as working fluid. Control of the not shown valve, which controls the flow rate of oil pressurized towards the port, allows the pressure differential of the two cylinder chambers to be controlled. The pressure difference causes the piston portion 21a to be deflected in the longitudinal direction of the corresponding tie bar 8.

The die clamping device 1 includes a first bar 8a and a first bar 31 and a tie bar for engaging and disengaging the tie bar 8 and the stationary die plate 6 from each other. 8) and a second engagement portion 8b and a second engagement portion 32 for coupling the movable die plate 6 and releasing the engagement operation. In addition, the first engagement portion 8a and the first engagement portion 31 constitute a fixed die plate engagement portion, while the second engagement portion 8b and the second engagement portion 32 are movable die plate engagement. Construct wealth.

For example, each first to-be-engaged portion 8a may be a coupling groove formed by a single spirally extending groove around the periphery of the tie bar 8, or extend around the periphery of the tie bar 8 and tie bar 8. It consists of a coupling groove formed by a plurality of grooves arranged longitudinally.

For example, each first coupling portion 31 is composed of a half nut. The opening and closing of the half nut causes the engagement (engagement) by the engagement groove or the engagement thereof to be released. Of the first engagement portions 31, at least the upper first engagement portion provided on the tie bar 8U is opened and closed by the first engagement drive 35. For example, the first coupling drive 35 is composed of a hydraulic cylinder. Its working principle is the same as the working principle of the clamping cylinder 10. In addition, the first engagement portion 31 provided on the tie bar 8L is opened and closed by any suitable means, whether manual or automatic.

Each first engaging portion 31 is provided on the rear surface of the stationary die plate 6 (opposite side of the surface on which the stationary die 501 is mounted). The rod portion 21b of the piston 21 projects from the rear surface of the stationary die plate 6. The first engaging portion 31 meshes with the rod portion 21b in the longitudinal direction of the tie bar 8. Therefore, releasing and engaging the engagement of the first to-be-engaged portion 8a and the first engaging portion 31 leads to releasing and engaging the tie bar 8a and the stationary die plate 6. .

For example, like the first to-be-engaged portion 8a, each second to-be-engaged portion 8b is formed by the grooves formed by the grooves extending helically around the periphery of the tie bar 8, or of the tie bar 8; It consists of engaging grooves formed by a plurality of grooves extending around the periphery and aligned longitudinally of the tie bar 8.

For example, like the first engaging portion 31, each second engaging portion 32 is composed of a half nut. The opening and closing of the half nut makes it possible to engage (engage) or engage such engagement with the engaging grooves. The second coupling part 32 is opened and closed by the second coupling drive 36. For example, the second coupling drive 36 is composed of a hydraulic cylinder. Its working principle is the same as the clamping cylinder 10.

Each second to-be-engaged portion 8b is located on the movable die plate 7 side from the end 8c of the tie bar 8 over a length substantially equal to the moving range of the movable die plate 7 in the open and closed directions. Is provided. On the other hand, the corresponding second engagement portion 32 is aligned with the back side of the movable die plate 7 (the side opposite to the side on which the movable die 502 is mounted). Therefore, when the first to be joined portion 8a and the first to be joined portion 31 are in the engaged state, the second to be joined portion 8b and the second to be joined portion 32 are die-closed position from the die open position P1. Even if the position up to P2 is in the movable die plate 7, it can be coupled to each other.

The die clamping device 1 moves the tie bars 8U in the retraction direction B1 (same direction as the die opening direction A1) and retracts them from the fixed die plate 6 or in the insertion direction B2. A retracting cylinder 41 is provided for generating the driving force used to move the tie bars 8U to insert into the stationary die plate 6.

For example, the retraction cylinder 41 includes a hydraulic cylinder having a piston 42, a cylinder portion 43 holding the piston 42, a piston rod 44 fixed to the piston 42, and a piston rod 44. It consists of a moving part 45 provided at the end. The working principle of the retracting cylinder 41 is the same as the clamping cylinder 10.

The cylinder portion 43 is fixed to the upper portion of the movable die plate 7. The cylinder portion 43 is aligned to extend to the rear side of the movable die plate 7 and does not protrude toward the die mounting surface side of the movable die plate 7. For example, the cylinder part 43 is aligned so that the end part of the side which opposes the end which the piston rod 44 enters and exits is located in the upper center of the movable die plate 7. The moving part 45 is located behind the movable die plate 7 and moves along the piston rod 44 in the retraction direction B1 or the insertion direction B2 by the pressurized oil of the cylinder part 44.

A hook system 51 which engages with the moving part 45 of the retracting cylinder 41 is provided at the end 8c of each tie bar 8U.

FIG. 5 is a side view showing the retraction cylinder 41 and the hook system 51 (seen in the same direction as FIG. 1), and FIGS. 6A and 6B show the moving part 45 and the hook (seen from the left in FIG. 5). It is a front view of the system 51.

For example, the moving part 45 has an engaging groove 45c which has a retracting direction B1 in the axial direction and opens in a direction perpendicular to the retracting direction B1 at its outer circumference and extends on the ring. Having a cylinder. That is, the moving part 45 has the base part 45a and the flange part 45b. The base portion 45a is formed in the form of a cylinder having a retraction direction B1 in its axial direction. The flange portion 45b is provided at both ends of the base portion 45a and protrudes from the base portion 45a in the direction perpendicular to the retraction direction B1. The flange portion 45b is formed into a disk having the same axis as the base portion 45a. The moving part 45 can be seen that it is fixed to the piston rod 44 by screwing the bolt 47 inserted into the through hole provided in the center of the member with the piston rod 44.

The hook system 51 is a hook plate (plate member) 52 insertable into the engaging groove 45c and a plate-like elevator cylinder (plate driving part) 53 for moving the hook plate 52 in and out of the engaging groove 45c. ).

The hook plate 52 is aligned in a direction perpendicular to the retraction direction B1 of the tie bar. Inserting the hook plate 52 into the engaging groove 45c and engaging it with the flange 45b will cause the moving part 45 of the retracting cylinder 41 to engage with the tie bar 8U. Also, as shown in Figs. 6A and 6B, the hook plate 52 is formed at its edge on the retracting cylinder 41 side with a semicircular cutout 52a into which the base portion 45a can be fitted. . Therefore, it can couple along the comparatively wide range (semicircle) of the flange part 45b.

The hook plate 52 is attached via the mounting plate 54 so as to be movable with respect to the tie bar 8U in a direction perpendicular to the retraction direction B1. Specifically, this is as follows.

The mounting plate 54 is aligned with the end 8c of the tie bar 8U in a direction perpendicular to the longitudinal direction of the tie bar 8U and fixed to the end 8c by bolts or the like. Guide pins 55 protruding from the mounting plate 54 toward the retreat direction B1 are provided on the mounting plate 54. The two guide pins 55 are provided in line, for example, from the tie bar 8U to the retracting cylinder 41 side. For example, the guide pin 55 is formed in a cylindrical shape having an enlarged end as shown in Fig. 5, and the base portion 55a in a direction perpendicular to the cylindrical base portion 55a and the tie bar 8U. Disk-shaped flange portion 55b protruding from the front end of the head.

On the other hand, the hook plate 52 has a long hole 52b extending from the cutout 52a. The width of the long hole 52b is larger than the base portion 55a of the guide pin 55 and smaller than the flange portion 55b. In addition, the hook plate 52 is attached over the mounting plate 54 such that the base portion 55a is inserted into the long hole 52b from the cutout portion 52a side. By doing so, the hook plate 52 is restricted by the flange portion 55b of the guide pin 55 in the retreat direction B1 side, and is retracted by the base portion 55a of the guide pin 55. It is guided to the cylinder 41 side and slides with respect to the mounting plate 54.

For example, the plate-shaped elevator cylinder 53 is composed of a pneumatic cylinder having a cylinder portion 57 and a piston rod 58 connected to a piston (not shown) held in the cylinder portion 57.

For example, the cylinder portion 57 is fixed by bolts or the like on the horizontal support plate 56 fixed by bolts or the like. The piston rod 58 is movable back and forth in the direction of the retracting cylinder 41 from the cylinder portion 57. For example, the piston rod 58 and the hook plate 52 are mutually secured by fastening the horizontally aligned connecting plate 59 to the front end of the piston rod 58 and the lower end of the hook plate 52 by bolts or the like. Connected.

It can be seen that the engaging groove 45c and the hook system 51 of the moving part 45 form a retracting engaging part.

As shown in Fig. 1, the die clamping device 1 has a control unit 61 for controlling the operation of various parts. For example, the control unit 61 is constituted by a computer including a CPU, a ROM, a RAM, and the like. The control unit 61 outputs a control signal to the motor 17 based on the rotational position of the motor 17 sensed by the encoder 18 to move the movable die plate 7 to the proper position at a proper speed. In addition, the control unit 61 is a cylinder chamber pressure or the clamping cylinder 10 of the hook system 51, the 1st coupling drive part 35, the 2nd coupling drive part 36, the retraction cylinder 41, and plate type elevator. The opening and closing operation of the valve used to supply the fluid to the cylinder chamber is controlled based on the position signal sensed at 53.

Further, in addition to the die clamping device 1, the die cast device including the die clamping device 1 is provided with an injection system (not shown) for supplying the melt to the die clamping device 1. For example, the injection system includes an injection sleeve connected to a cavity formed by the fixed die 501 and the movable die 502, a plunger end sliding in the injection sleeve, and an injection cylinder driving the plunger end.

The operation of the die clamping device 1 described above is as follows.

First, the operation of the die clamping device 1 in the molding cycle will be described. At the start of the molding cycle, the movable die plate 7 is located in the die open position P1 shown in FIG. At this time, the first to-be-engaged portion 8a and the first to-be-engaged portion 31 are engaged. That is, the tie bar 8 and the stationary die plate 6 are fixed. Moreover, the engagement operation of the 2nd engagement part 8b and the 2nd engagement part 32 is canceled | released. That is, the engagement operation of the tie bar 8 and the movable die plate 7 is released.

From this state, the drive mechanism 9 moves the movable die plate 7 toward the die closing direction A2. When the movable die plate 7 reaches the die closing position P2 shown in FIG. 2 and the fixed die 501 and the movable die 502 contact, the die closing operation is terminated. 2 shows a state in which the hook system 51 is coupled to the moving part 45, but in the molding cycle, the engagement operation of the hook system 51 and the moving part 45 is in a released state.

At this time, the second engagement portion 32 provided on the movable die plate 7 is located within the range of the second engagement portion 8b of the tie bar 8. However, it also occurs when the groove of the second to-be-engaged portion 8b and the teeth of the second to-be-engaged portion 32 are misaligned by an amount smaller than the pitch. In this case, the position of the ring-shaped piston 21 in the cylinder chamber 22 is supplied by supplying pressurized oil to the cylinder chamber 22 or the like so that the second engagement portion 8b and the second engagement portion 32 can be engaged. Adjusted. Next, the second engaging portion 32 is closed to engage the second engaging portion 32 and the second to-be-engaged portion 8b. That is, the tie bar 8 and the movable die plate 7 are combined.

Next, the clamping cylinder 10 performs a clamping operation. That is, with the tie bar 8 fixed to the stationary die plate 6 and the movable die plate 7, the clamping cylinder 10 causes the tie bar to generate a clamping force in accordance with the extension amount of the tie bar 8. Apply tension to (8). At this time, it can be seen that the motor 17 of the drive mechanism 9 has no torque.

In this state, the melt is injected from the injection system to fill the cavity formed by the fixed die 501 and the movable die 502. When the melt solidifies in the cavity and die casting is formed, the clamping force from the clamping cylinder 10 is reduced to end the clamping operation. Next, the second engagement portion 32 is opened to release the engagement operation of the second engagement portion 32 and the second to-be-engaged portion 8b. That is, the engagement operation of the movable die plate 7 and the tie bar 8 is released.

Next, the drive mechanism 9 moves the movable die plate 7 in the die opening direction A1. At this time, it can be seen that the first to-be-engaged portion 8a and the first engaging portion 31 are coupled. That is, the tie bar 8 and the stationary die plate 6 are combined.

Then, the movable die plate 7 reaches the die open position P1 at the start of the cycle (FIG. 1). The molded article is taken out and the fixed die 501 and the movable die 502 are coated with a release agent or treated to end the molding cycle.

Next, the operation of the die clamping device 1 at the retraction of the tie bar will be described.

As described above, at the end of the molding cycle, the movable die plate 7 is located in the die open position P1 shown in FIG. At this time, while the first to-be-engaged portion 8a and the first to-be-engaged portion 31 are engaged, the engagement operation of the second to-be-engaged portion 8b and the second engaging portion 32 is released.

From this state, in the same manner as the die closing operation of the molding cycle, the movable die plate 7 is moved to the die closing position P2 shown in FIG. The speed control at this time may be the same as or different from the speed control during the die closing operation during the molding cycle.

Next, the hook system 51 and the moving part 45 are coupled. That is, the retraction cylinder 41 and the tie bar 8 are engaged. In addition, the coupling operation of the first to-be-engaged portion 8a and the first engaging portion 31 used for the tie bar 8U is released. That is, the coupling operation of the tie bar 8U and the stationary die plate 6 is released.

Also, as shown in Fig. 3, the drive mechanism 9 moves the movable die plate 7 to the die opening direction P1. By doing so, the tie bar 8U is retracted from the stationary die plate 6 and moved to the first retracted position P5 so that the driving force of the drive mechanism is transmitted through the retracting cylinder 41 and the movable die plate 7.

Thereafter, as shown in Fig. 4, the retraction cylinder 41 moves the moving part 45 to the retraction direction B1. By doing so, the tie bar 8U is moved to the second retracted position P6.

Retracting the tie bar 8U to the first retracted position P5 by the drive mechanism 9 is such that the second engaged portion 8b and the second engaging portion 32 provided in correspondence with the tie bar 8U are provided. It can be seen that it is performed by moving the movable die plate 7 to the die open position P1 in the engaged state. In addition, the coupling of the moving part 45 and the hook system 51 and the coupling of the second to-be-engaged part 8b and the second engaging part 32 may be performed together.

Further, when the tie bar 8U is retracted by the die opening operation of the movable die plate 7 in a state in which the movable part 45 and the hook system 51 are engaged, the moving part (by the retracting cylinder 41) It is also possible to carry out the movement of the 45 first, after which the movable die plate 7 is opened via the drive mechanism 9 or the movable part is simultaneously moved by the retraction cylinder 41 and by the drive mechanism 9. It is also possible to open the movable die plate 7.

In the die clamping device 1, it is also possible to insert the tie bar 8U into the stationary die plate 6. In this case, the operation can be performed by a method opposite to the retraction. That is, from the state of FIG. 4, the retraction cylinder 41 moves the moving part 45 in the insertion direction B2, and the drive mechanism 9 moves the movable die plate 7 in the die closing direction A2. The state shown in 2 is achieved.

According to this embodiment, the movement from the first retracted position to the second retracted position is handled by the retracting cylinder 41 and in the movement of the tie bar 8U during retreating, the movement to the first retracted position. Is processed by the drive mechanism 9, the retraction cylinder 41 does not require a stroke corresponding to the movement amount of the tie bar 8U during the retraction. This makes it possible to reduce the size of the retracting cylinder 41.

Fig. 7A is a conceptual diagram showing the effect of the above embodiment. In FIG. 7A, the solid movable die plate 7 and tie bar 8U show the state shown in FIG. If the stroke of the retracting cylinder 41 is d1, and the moving distance from the die closing position P2 of the movable die plate 7 to the die opening position P1 is d2, then the fixed die plate 6 is removed. The amount of movement of the tie bar 8U from the position P4 not retracted to the 2 retraction position P6 becomes d1 + d2.

In addition, in the above embodiment, when the tie bar 8U is in the position P4 where the retracted portion (the first engaged portion 8a and the first engaging portion 31 are mutually engageable), the movable die plate ( 7) is in the die closing position P2 (limiting position on the die closing direction A2 side of the moving range of the movable die plate 7), and the moving part 45 is restricted in the insertion direction B2 side on the moving range. In position, the moving part 45 and the hook system 51 can be combined. Therefore, the stroke d1 of the retracting cylinder 41 and the distance d2 from the die closing position P2 to the die opening position P1 are all added to the movement amount of the tie bar 8U.

However, as with the modification of the present invention shown in Fig. 7B, when the tie bar 8U is in the non-retracted position P4, the movable die plate 7 is in the die closing position P2, and the moving portion ( 45 is in the insertion direction B2 side restriction position in the movement range, the moving part 45 is located in the insertion direction B2 side than the hook system 51 and the moving part 45, and the hook system 51 Cannot be combined. In this case, in the state where the engagement operation of the second to-be-engaged portion 8b and the second engagement portion 32 is released, that is, with the engagement operation of the tie bar 8U and the movable die plate 7 released. , The drive mechanism 9 moves the movable die plate 7 to an intermediate position P11 between the die closing position P2 and the die opening position P1, and moves the movable portion 45 and the hook system 51. Combine. In this case, the moving distance of the movable die plate 7 to be added to the stroke d11 of the retracting cylinder 41 'as the movement amount d11 + d21 of the tie bar 8U is the die opening position from the intermediate position P11. It is the distance d21 to P1.

Therefore, in this embodiment, when the movable die plate 7 is in the die closed position P2 and the tie bar 8U is not retracted from the fixed die plate 6, the insertion direction B2 side restriction in the moving range is limited. The moving part 45 and the hook system 51 in position can be engaged. Therefore, as compared with the configuration shown in Fig. 7B, the amount of movement of the tie bar 8U can be made larger by the distance d22 from the die closing position P2 to the die intermediate position P11, or the retraction cylinder ( 41) can be made smaller.

However, even with the configuration shown in Fig. 7B, the distance d21 can be added to the stroke d11 of the retracting cylinder 41 'to form the amount of movement of the tie bar 8U. In comparison with the above, the amount of movement of the tie bar 8U can be larger, and the retraction cylinder 41 'can be smaller. That is, when the tie bar 8U is in the position not to be retracted, the moving part 45 is in the insertion direction B2 side restriction position in the moving range, and the movable die plate 7 is more than the die opening position P1. If the position is on the side of the die closing direction A2 and the moving part 45 and the hook system 51 are engaged, the effect of the present invention can be obtained.

However, the retraction cylinder 41 'is meaningful when d11 + d21> d2, that is, when d11> d22. Further, the tie bar 8U is in a position where it is not retracted, the moving part 45 is in a restriction position on the insertion direction B2 side of the tie bar in the moving range of the moving part, and the movable die plate 7 is in the die opening position. At P1 and when the moving part 45 is located in the retraction direction B1 than the hook system 51, the moving part 45 and the hook system 51 cannot be engaged. In this case, the retracting cylinder loses its meaning because the moving part 45 and the hook system 51 cannot be engaged even if the movable die plate 7 is moved.

Further, in this embodiment, the hook system 51 is provided at the end 8c of the tie bar 8U protruding from the movable die plate 7, so that the retracting cylinder 41 is rearward of the movable die plate 7. It is configured to make the moving part move on the side. Therefore, the retraction cylinder 41 can be positioned and protrudes toward the die mounting surface side of the movable die plate 7.

Here, the moving part 45 and the hook system 51 of the above embodiment (and the modification of FIG. 7B) are provided with the movable die plate 7 without the tie bar 8U being retracted from the stationary die plate 6. It is located in the die closing direction A2 more than the die opening position P1, and is configured to engage when the moving part 45 is in the insertion direction B2 side restriction position in the movement range. Therefore, as shown in Fig. 8A, the engagement operation of the movable die plate 7 and tie bar 8U is released, and the movable die plate 7 is moved from the state shown in Fig. 7A to the die opening position P1. If moved, the moving part 45 will further protrude toward the retraction direction B1 by the distance d4 compared to the hook system 51. The distance d4 = d21 in the configuration of FIG. 7B, and the distance d4 = d2 in the configuration of FIG. 7A. This means that the amount of protrusion d3 of the retracting cylinder 41 from the movable die plate is greater than the amount of protrusion d5 of the tie bar 8U from the movable die plate 7 located at the die opening position P1 by the distance d4. It can be large. That is, in the tie bar 8U, the amount of protrusion d5 from the movable die plate 7 located at the die opening position P1 may be smaller by the distance d4 than the amount of protrusion d3.

However, as described above, when the hook system 51 is not provided and the cylinder rod and the tie bar are fixed together, as shown in Fig. 8B, the amount of protrusion of the tie bar 108U is projected from the retracting cylinder 141. It will be the same level as (d31). In addition, in Fig. 8B, when attempting to fix with the amount of movement of the tie bar corresponding to Fig. 8A, the retraction cylinder 141 should have a stroke of d1 + d2, as can be well understood from Fig. 7A. Therefore, the amount of protrusion d31 of the retracting cylinder 141 from the movable die plate 7 becomes d31 = d3 + d2, which is larger than the amount of protrusion d3.

Therefore, in the die clamping apparatus 1 in the present embodiment, the tie bar 8U may be 2xd2 shorter than the conventional tie bar 108U. Alternatively, the retracting cylinder 41 may be arranged further on the rear side of the movable die plate 7 than above, and protruding of the retracting cylinder between the movable die plate 7 and the fixed die plate 6 can be prevented. have. Further, in the preferred embodiment, the tie bar 8U and the base 5 have a length shortened to the same level, so that the reduction of the tie bar 8U is the die clamping device 1 including the base 5 and the like. It can contribute to reducing the size of the whole.

The present invention is not limited to the above embodiment and can be implemented in various ways.

The molding machine to which the die clamping device of the present invention is applied is not limited to the die cast machine. Molding machines include metal forming machines, plastic injection machines, sawdust forming machines and the like. Saw blade forming machines include, for example, machines for shaping materials consisting of saw blades mixed with thermoplastic resins.

In the present invention, in order to retract the tie bar along the opening of the movable die plate, the movable die plate and the tie bar must be joined. Moreover, the combination of the movable die plate and tie bar combines the retracting cylinder and the tie bar to provide a retraction cylinder to the movable die plate and indirectly couples the movable die plate and the tie bar, or directly joins the movable die plate and the tie bar. Can be achieved by using a movable die plate engaging portion (a second to-be-engaged portion and a second engaging portion).

If the movable die plate is provided with a retracting cylinder, the movable die plate and the tie bar are indirectly coupled by combining the retracting cylinder and the tie bar, and the tie bar is retracted along the movable die plate, the movable die plate engaging portion of the present invention This is not an essential requirement. Thus, for example, the present invention can be used for a die clamping device in the form of a toggle that does not couple a movable die plate and a tie bar.

If providing a movable die plate coupling, directly coupling the movable die plate and tie bar, and retracting the tie bar along the opening of the movable die plate, providing a recess in the movable die plate is not an essential requirement of the present invention. For example, it is also possible to use a movable die plate coupling to engage the movable die plate and the tie bar, move the movable die plate in the open direction to move the tie bar to the first retracted position, and furthermore, the first retracted position. In combination with the tie bar and provide a recess for further moving the tie bar from the first retracted position to the second retracted position in the base or fixed die plate. Even in this case, the movement of the tie bar is split between the movable die plate and the recess.

The first to-be-engaged portion may also be provided on the stationary die plate and the first to-be-engaged portion may be provided on the tie bar. The second engagement portion may also be provided on the movable die plate and the second engagement portion on the tie bar. The third to-be-engaged portion may be provided at the movable die plate, and the third to-be-engaged portion may be provided at the moving portion of the retreat portion. Moreover, such a to-be-engaged portion and the engaging portion can be appropriately configured and are not limited to the engaging groove and the half nut or the engaging groove and the hook plate. For example, to retract the tie bar, no strong force during clamping is applied to the tie bar, and instead of the hook system of the third engagement portion, the gripping system can grasp the proper position of the tie bar by a predetermined pressure. It may be provided to eliminate the need for this third to-be-engaged portion. Moreover, the engaging portion is not limited to being driven by the oil pressure cylinder but may be driven by, for example, a motor.

Single tie bars may also be provided. However, in order to maintain an average degree of the movable die and the fixed die for clamping, it is preferable that a plurality be provided.

The die opening and closing may be any one that merely moves the movable die plate in the open and closed directions and is not limited to the ball-screw structure. For example, it can be configured by a pressurized oil cylinder or rack and pinion mechanism. The clamping force generating portion is not limited to the cylinder system with the cylinder chamber inside the stationary die plate. For example, it may be constituted by a ball screw structure. Moreover, the die clamping device does not need to be composed of a die clamping device of a complex type. Similar to the double clamping die clamping device, both die opening and closing and clamping force generating portions can be used.

The recess may be any one that moves the mover relative to the moveable die plate. This is not limited to oil pressure cylinders. For example, it may be constituted by a ball screw structure or a rack and pinion mechanism.

In this embodiment, the open position in the molding cycle is a restricted position in the die opening direction of the movable range, but the position in the die closing direction on the side more than the restricted position may also be the die open position in the molding cycle, More movement in the side die opening direction than in the open position is possible.

Although the present invention has been described with reference to specific embodiments selected for purposes of illustration, it is apparent that many modifications are possible by those skilled in the art within the basic concepts and scope of the invention.

According to the invention, the tie bar can provide a retractable die clamping device.

Claims (8)

Die clamping device, With fixed die plate, A movable die plate movable in the open and closed directions with respect to the stationary die plate, A tie bar retractable from said stationary die plate and inserted into said movable die plate and said stationary die plate; A die opening and closing portion for moving the movable die plate in an open and closed direction, A retreating portion provided on the movable die plate and having a movable portion that can be coupled with a tie bar, and for moving the movable portion with respect to the movable die plate in a retracting direction of the tie bar; A retraction coupling portion for engaging the moving portion with the tie bar and releasing the engagement operation; The retracting engaging portion may engage the moving portion and the tie bar when the tie bar is not retracted from the stationary die plate, and the moving portion is located at a restricted position on the insertion direction side of the tie bar in the moving range of the moving portion. And the movable die plate is in a position on the die closing direction side from a limiting position on the die opening direction side of the moving range of the movable die plate. 2. The tie bar of claim 1 wherein said retracting engagement portion engages said mover and said tie bar when said tie bar is not retracted from said stationary die plate, and said mover inserts said tie bar in the range of movement of said mover. The die clamping device in a restricted position in a direction, and the movable die plate is in a restricted position in a die closed position in the range of movement of the movable die plate. The die clamping device according to claim 1, wherein the retraction engaging portion engages and releases the engaging operation with the end of the tie bar protruding from the movable die plate toward the retraction direction. Die clamping device, With fixed die plate, A movable die plate movable in the open and closed directions with respect to the stationary die plate, A tie bar retractable from said stationary die plate and inserted into said movable die plate and said stationary die plate; A die opening and closing portion for moving the movable die plate in an open and closed direction, A retreating portion provided on the movable die plate and having a movable portion that can be coupled with a tie bar, and for moving the movable portion with respect to the movable die plate in a retracting direction of the tie bar; A retraction coupling unit for coupling the moving unit and the tie bar and releasing a coupling operation; The retracting engaging portion, the die opening and closing portion, such that the die opening and closing portion moves the movable die plate in the die opening direction and the retracting portion moves the tie bar in the retracting direction in the engaged state through the retracting engaging portion; Die clamping device comprising a control unit for controlling the operation of the recess. Die clamping device, With fixed die plate, A movable die plate movable in the open and closed directions with respect to the stationary die plate, A tie bar retractable from said stationary die plate and inserted into said movable die plate and said stationary die plate; A movable die plate coupling portion for coupling the movable die plate and the tie bar and releasing the coupling operation; A die opening and closing portion for moving the movable die plate in the open and closed directions; A retreat having a moving part that can be engaged with a tie bar and moving the moving part in a retracting direction of the tie bar; A retraction coupling portion for fastening the tie portion and the tie bar; The die opening and closing portion moves the movable die plate in the die opening direction in the engaged state by the movable die plate engaging portion, and then releases the engaging operation by the movable die plate engaging portion and the retracting engaging portion Die clamping including a control portion for controlling the operation of the movable die plate engaging portion, the retracting engaging portion, the die opening and closing portion, and the recessing portion to move the retracting portion in the retracting direction in the engaged state Device. The die clamping device according to claim 5, wherein the recess is provided in the movable die plate. The die clamping device according to claim 1, wherein the retracting portion is a cylinder device having a piston coupled to the moving portion and a cylinder portion housing the piston that can move in a retracting direction of a tie bar. 2. The retracting portion of claim 1, wherein the retreating engagement portion has an engaged portion having a coupled groove open in a direction perpendicular to the retraction direction of the tie bar, and is insertable into the joined groove and perpendicular to the retraction direction of the tie bar. A die clamping device having an arranged engagement plate member and a plate driver for inserting and retracting the plate member into and out of the engaged groove.

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