JP2010082630A - Movable die plate of die casting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a movable die plate in which deformation of a die fitting plate is not caused even when it is thinned and lightened, in a device having a high pressure toggle mechanism such as a die casting machine. <P>SOLUTION: The movable plate 1 of the die casting machine M is composed of: (a) a die fitting plate 2 provided with a die fitting face 2a, and die bar guide parts 3 where tie bar guide holes 4 into which tie bars 12 are inserted at the four corners thereof; (b) a back support part 6 of an almost octagonal and projectingly formed ridge shape, which is projectingly provided so as to cover the outer form of a movable die K1 at the back face of the die fitting plate 2 and has a fixed width W, and whose inside forms a recessed part 5 in a recessed shape; and (c) the toggle arm fitting part 8 of a toggle mechanism T for die clamping provided to the back support part 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a moving die plate of a die casting machine.

  2. Description of the Related Art Conventionally, in a die casting machine, molten metal supplied into a casting cylinder is injected at high pressure into a cavity space of a mold that has been clamped, and the molten metal is cooled and solidified in the cavity space. Product is to be molded.

  The mold is composed of a fixed mold and a movable mold. The mold is closed by advancing and retracting a movable die plate on which the movable mold is mounted by a clamping device, and moving the movable mold toward and away from the fixed mold. Then, mold clamping and mold opening can be performed. The mold clamping device has a fixed die plate to which a fixed die is attached and a movable die plate to which a movable die is attached. A toggle mechanism is used as a mold clamping device for moving the movable die plate forward and backward. The toggle mechanism is arranged between the frame and the toggle mechanism is operated by a clamping cylinder provided in the end frame.

  A fixed mold is attached to the fixed die plate, and a movable mold is attached to the movable die plate. After the toggle mechanism is activated and the movable mold is pressed against the fixed mold, the molten metal is injected. Done. At this time, the mold mounting plate may bend at the edge of the mold that receives a strong force from the toggle mechanism due to the high pressure mold clamping, and in a severe case, the mold mounting surface may be deformed into the shape of the mold. is there.

  Therefore, in order to prevent such bending and deformation of the mold mounting plate, the thickness of the mold mounting plate is increased as much as possible to increase the rigidity. However, this method prevents the bending and deformation. Although it was possible to do so, the weight increased accordingly, and the device strength had to be increased to withstand this weight.

  For this reason, the weight of the apparatus increases and becomes excessive, and in addition to this, there has been a problem that the manufacturing cost is greatly increased due to the recent increase in the price of iron materials.

As one method for solving such a problem, a moving die plate described in Patent Document 1 has been proposed (see FIGS. 8 to 12). The movable die plate 100 prevents the mold mounting plate 101 from bending and the mold mounting surface 101a from being deformed without increasing the thickness of the mold mounting plate 101, and includes a mold mounting surface 101a. Mold mounting plate 101, guide portion 145 through which tie bar 107 is inserted, upper / lower load receiving portions 102, 103 for supporting shafts of upper / lower toggle arms 108, 108 of the toggle mechanism, and upper / lower load receivers The load receiving portion connecting member 141 installed between the portions 102 and 103, one end is connected to the upper and lower load receiving portions 102 and 103, and the other end is attached to the mold more than the upper and lower load receiving portions 102 and 103. The load transmitting member 142 is connected to the back surface of the mold mounting plate 101 at a position close to the center of the plate 101. As a result, when a mold clamping load during mold clamping is applied to the mold mounting plate 101, the mold clamping load acts at a position close to the center of the mold mounting plate 101, so that the bending moment is reduced and the mold mounting is performed. Even if the plate thickness is not increased, bending of the mold mounting plate 101 and deformation of the mold mounting surface 101a can be prevented.
JP 2003-89133 A

  Although the movable die plate 100 can be reduced in weight according to the above-described conventional technology, the rectangular large hole 143 is formed between the load transmitting members 142 as shown in FIGS. This is a weak point for high-temperature, high-pressure, high-speed injection devices such as die casting machines, and the lighter moving die plate 100 eliminates the problem of its own bending, deformation, and deformation of the mold. I could not.

  The present invention has been developed in view of such conventional problems. Therefore, the main problem of the present invention is that there is no deformation of the mold mounting plate even if the weight is reduced in an apparatus that has a high pressure toggle mechanism such as a die casting machine and performs injection at high temperature, high pressure, and high speed. It is to provide a moving die plate.

The present invention relates to a moving die plate 1 of a die casting machine M,
(A) a mold mounting plate 2 provided at its four corners with a mold mounting surface 2a and tie bar guide portions 3 in which tie bar guide holes 4 through which the tie bars 12 are inserted;
(B) The back surface of the mold mounting plate 2 is provided so as to cover the outer shape of the movable mold K1 mounted on the mold mounting plate 2, has a certain width W, and the inside thereof is recessed. A substantially octagonal ridge-shaped back support portion 6 which is a concave moat portion 5;
(C) It is characterized by comprising a toggle arm mounting portion 8 of a clamping mechanism T provided in the back support portion 6.

  A second aspect is a further improvement of the first aspect, characterized in that the tie bar guide portion 3 and the back support portion 6 are connected by a reinforcing rib 7.

  The moving die plate 1 of the present invention includes a mold mounting plate 2, a back support portion 6 on the back surface thereof, a toggle arm mounting portion 8 of a clamping mechanism T provided on the back support portion 6, and a tie bar guide portion 3. The back support portion 6 and the reinforcing arm 7 are connected to each other. The back support portion 6 and the toggle arm attaching portion 8 are mainly used as a load carrying structure. The reinforcing rib 7 further provides the back support portion 6 and the toggle arm attaching portion. 8 and integration.

  When a mold clamping load due to mold clamping is applied to the movable die plate 1 of the die casting machine M, the high-pressure mold clamping force from the toggle mechanism T is directly applied to the back support portion 6 via the toggle arm mounting portion 8. And since the back support part 6 covers the external shape of the movable mold K1 attached to the mold attachment plate 2, the load applied to the back support part 6 is directly transferred through the mold attachment plate 2 to the movable mold K1. Will join. The portions other than the back support portion 6 of the mold mounting plate 2 are not places where direct force is applied. Therefore, if the strength of the back support portion 6 and the toggle arm mounting portion 8 provided on the back support portion 6 is sufficiently strong to counteract the clamping force, even if the thickness of the other portions is significantly reduced. The bending and deformation of the movable die plate 1, and more specifically the mold mounting plate 2, can be largely avoided.

  In addition, even if the entire movable die plate 1 is greatly reduced in thickness as described above, the back support portion 6 and the tie bar guide portion 3 are integrated by the reinforcing rib 7, so that the high pressure mold clamping is performed on the back support portion 6. The parallelism of the tie bar guide part 3 is not impaired by the high pressure clamping force when a force is applied.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic plan view of a die casting machine of the present invention, and FIG. 2 is a schematic front view thereof. In the figure, a fixed die plate 23 is fixed to the right end on the frame 21 which is a base, and a toggle support 34 is slidably disposed on the left end at a predetermined distance from the fixed die plate 23. Yes. Four tie bars 12 are installed between the fixed die plate 23 and the toggle support 34.

  The movable die plate 1 facing the fixed die plate 23 is guided by the tie bar 12 so as to be able to approach and separate from the fixed die plate 23. The opposing surfaces of the fixed die plate 23 and the movable die plate 1 are mold attachment surfaces 23a and 2a, respectively, so that the movable mold K1 and the fixed mold K2 can be mounted respectively. In addition, an ejector pin driving device E for projecting an ejector pin is mounted in a back support portion 6 which will be described later, and is projected from the center of the back surface of the movable die plate 1.

  A toggle mechanism T as a mold clamping device is provided between the movable die plate 1 and the toggle support 34, and a toggle drive device 30 (this embodiment) as a mold clamping drive means is provided on the back surface of the toggle support 34. In the example, a hydraulic cylinder) is installed. The toggle drive device 30 operates the toggle mechanism T by moving the crosshead 35 forward and backward using a hydraulic cylinder or the like as a drive source.

  The toggle mechanism T is connected to the connecting lever 36 that is swingably supported with respect to the cross head 35, the toggle operating lever 32 that is swingably attached to the toggle support 34, and the movable die plate 1. The toggle arm 33 is swingably attached, and the toggle operating lever 32 and the connecting lever 36 and the toggle operating lever 32 and the toggle arm 33 are linked to each other. As a result, after the movable die plate 1 moves forward in the direction of the fixed die plate 23 and closes the mold, the toggle mechanism T generates a mold clamping force obtained by multiplying the propulsive force by the toggle driving device 30 by the toggle magnification, and the mold clamping. Clamping by force is performed. Of course, the mold can be directly clamped by the toggle driving device 30 without using the toggle mechanism T.

  The movable die plate 1 is formed with tie bar guide holes 4 through which the tie bars 12 are inserted at the four corners, and tie bar bushes 12a are respectively fitted into the tie bar guide holes 4 forward and backward, respectively. Through this, the inner peripheral surface of the tie bar bush 12a slides along the tie bar 12, and the movable die plate 1 reciprocates.

  A die mounting plate 2 having a substantially rectangular shape in the main body portion of the movable die plate 1 has a die mounting surface 2a. In the central portion of the mold mounting surface 2a, for example, a moving mold is provided. A through hole 51 is provided for disposing an ejector rod unit (not shown) of the ejector pin driving device E in which an ejector pin (not shown) protruding into the cavity in K1 is accommodated.

  At least the thickness of the mold mounting plate 2 is sufficient so that the mounting groove 2b for mounting the movable mold K1 is recessed, and the movable mold K1 is held and not deformed. It is slightly thicker. The back surface of the mold mounting plate 2 covers the outer shape of the movable mold K1, has a certain width W, and has a substantially octagonal ridge shape in which the inner side is a concavely shaped recess 5. A back support 6 is provided. Accordingly, the portion surrounded by the back support portion 6 is formed with the concave portion 5 having a substantially octagonal concave shape. An ejector pin driving device E is attached to this portion.

  The upper, lower and both sides of the back support portion 6 are provided in parallel with the upper and lower sides of the mold mounting plate 2 and provided at the corners of the convex support sides 6a to 6d. In addition, the inclined ridge-like sides 6e to 6h are formed in a slightly standing state (a state where the angle formed between the vertical ridge-like sides 6b and 6d is small) in this embodiment. Of course, according to the shape of the moving die plate 1, the octagonal convex shape of the back support portion 6 is deformed accordingly. Therefore, the inclined ridge-like sides 6e to 6h can be further laid down (a state where the angle formed between the vertical ridge-like sides 6b and 6d is large). As an angle, it is provided in the range of 60 degrees to 30 degrees with respect to the vertical ridge-like sides 6b and 6d.

  And the corner | angular part of the moving mold K1 will be located in the part corresponding to these inclined convex-shaped sides 6e-6h, and the upper and lower sides and both sides of a metal mold | die are located in the horizontal and vertical convex-shaped sides 6a-6d. Will be located. Of course, some protrusion is allowed as long as there is no influence on the mold mounting plate 2. Reinforcing ribs 7 are attached between the tie bar guide portion 3 and the inclined ridge-like sides 6e to 6h, respectively.

  Side reinforcement ribs 6i and 6j are provided on the upper and lower sides on the back side of the mold mounting plate 2 in parallel to the outer sides of the upper and lower horizontal convex flanges 6a and 6c. A toggle arm mounting portion 8 for pivotal support of the toggle arm 33 is projected rearward mainly on the side portion reinforcing ribs 6i and 6j, and the back support portion 6 is used for most of the mold clamping force applied to the toggle arm mounting portion 8. It can be supported. In the present embodiment, the toggle arm mounting portion 8 is formed separately on the left and right sides. However, the toggle arm mounting portion 8 may be a single one, or the side reinforcing ribs 6i and 6j may be removed to remove the upper and lower horizontal protrusions. You may integrally provide only in the shape sides 6a and 6c.

  The fixed die plate 23 is equipped with a molten metal injection device S including an injection sleeve 24.

  Next, the operation of the device of the present invention will be described. The toggle driving device 30 shown in FIG. 1 is activated to advance the crosshead 35 and activate the toggle mechanism T. As a result, the movable die plate 1 moves forward, the movable mold K1 is joined to the fixed mold K2, and the mold is closed, and then, further mold clamping force is applied to perform mold clamping. Subsequently, the molten metal is injected from the injection device S at a high pressure, and the cavity space of the mold K is filled with a high pressure, and the molten metal is cooled and solidified while applying a back pressure to form a die cast product. Subsequently, the toggle drive device 30 reversely operates to retract the cross head 35, retract the movable die plate 1, move the movable mold K1 away from the fixed mold K2, and open the mold, and advance the ejector rod (not shown). And take out the die-cast molded product. A die-cast molded product is formed by repeating the above operation.

  Here, at the time of mold clamping, thrusts F1 and F2 (mold clamping force) from the upper and lower toggle arms 33 of the toggle mechanism T act on the toggle arm mounting portion 8 of the movable die plate 1, and this thrust (mold clamping force). Is supported by the convex ridge-like sides 6a and 6c of the back support portion 6 formed integrally with the toggle arm mounting portion 8, and the other convex ridge-like sides 6b, 6d and 6e following this are carried. ˜6h carries the bending moment, and carries most of the thrusts F1 and F2 as a whole. In addition, since the range of the outer periphery of the large to small movable mold K1 indicated by the rectangular oblique line is within the range indicated by the grid of the width W of the back support portion 6, the mold mounting plate 2 is driven by the thrusts F1 and F2. Can be avoided. For this reason, since the bending moment acting on the mold mounting plate 2 is reduced, the mold mounting plate 2 does not bend even if the thickness of the mold mounting plate 2 is not increased.

  The back support portion 6 is formed in a substantially octagonal shape close to a circle, so that it is less likely to twist even when a high-pressure clamping force is applied, and exhibits a large resistance force not only to compression but also torsion of the moving die plate 1. To do.

  In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.

The top view of the die-casting machine in the Example of this invention Front view of FIG. Front view of moving die plate in an embodiment of the present invention Vertical sectional view of FIG. XX sectional view of FIG. YY sectional view of FIG. Cross-sectional perspective view of FIG. Perspective view of conventional moving die plate Side view of FIG. Partial sectional view of FIG. AA sectional view of FIG. BB sectional view of FIG.

Explanation of symbols

M ... Die casting machine K1 ... Mold W ... Back support part width T ... Toggle mechanism 1 ... Moving die plate 2 ... Mold attachment plate 2a ... Mold attachment surface 3 ... Tie bar guide part 4 ... Tie bar guide hole 5 ... Recessed part 6 ... Back support part 7 ... Reinforcement rib 8 ... Toggle arm attachment part

Claims (2)

(A) a mold mounting plate provided at the four corners with a mold mounting surface, and tie bar guide portions in which tie bar guide holes through which the tie bars are inserted;
(B) The back surface of the mold mounting plate is provided so as to cover the outer shape of the mold mounted on the mold mounting plate, has a certain width, and has a concave moat portion on the inner side thereof. A substantially octagonal ridge-shaped back support portion,
(C) A moving die plate for a die casting machine, comprising a toggle arm mounting portion for a clamping mechanism for a clamping mechanism provided in the back support portion.   The moving die plate for a die casting machine according to claim 1, wherein the tie bar guide portion and the back support portion are connected by a reinforcing rib.

Images