JP6534153B2 - Clamping device and molding machine - Google Patents

Description

  The present invention relates to a molding machine such as a die casting machine and a mold clamping device used for the molding machine.

  In a molding machine such as a die casting machine or a plastic injection molding machine, a molding material (molten material) is injected and filled in a cavity of the mold in a state where the mold is clamped. In this case, in order to prevent the leakage of the molding material from the parting surface of the mold, the mold clamping is performed by the mold clamping device. As this mold clamping device, for example, a toggle mechanism type is known.

  The toggle mechanism type clamping device is connected to the tail stock and the movable die plate, and includes a toggle link mechanism for moving the movable die plate in the mold opening and closing direction by extension and bending, and the toggle link mechanism supports the movable die plate The movable mold and the fixed mold supported by the fixed die plate are clamped (see, for example, Patent Document 1). Since this toggle mechanism type clamping device generates a large clamping force at the clamping limit, the mold clamping can be performed stably.

JP, 2010-99702, A

  By the way, when manufacturing a mold used for the above-mentioned molding machine, an operation called die spotting is performed at the final finishing stage. In die spotting, when paint (light phototon etc.) is applied to a movable mold or a fixed mold and the movable mold is gradually brought close to the fixed mold and both molds are slightly contacted This is the work of final finishing while confirming the trace of

  Conventionally, die spotting is performed by a dedicated device (hereinafter referred to as a "die spotting machine"). Since this die spotting machine is large in size, it is rarely placed in the factory of a maker (hereinafter referred to as a "product maker") that manufactures a product using a mold, and die spotting is exclusively for the mold. It was customary to be implemented by the manufacturer.

  However, in order to cope with the shortening of the product cycle, the higher performance of the product, and the higher precision, there is a growing demand for the product maker to perform die spotting. In order to introduce a die spotting machine into a factory of a product manufacturer, the installation space must be secured in the existing manufacturing line, and the layout change is required, so the introduction is often difficult.

  In order to solve this, for example, it is conceivable to provide a die spotting function in a clamping device used in a molding machine. If this can be realized, it is not necessary to secure an installation space for a die spotting machine in a factory or the like. However, for example, in the toggle mechanism type clamping device, although it is possible to generate very large clamping force at the clamping limit, it is difficult to control this toggle mechanism precisely and in real time, and the die spotting function It was difficult to realize.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a mold clamping device and a molding machine capable of achieving both a mold clamping function for molding and a die spotting function.

  The present invention is intended to solve the above-mentioned problems, and a fixed die plate for supporting a fixed die, a movable die plate for supporting a movable die, and a frame suspended by the fixed die plate and the movable die plate. A plurality of tie bars, a driving device for opening and closing the movable die plate to move the movable die plate to open and close the movable die with respect to the fixed die, and clamping the movable die and the fixed die In order to move the movable die plate, a clamping driving device is provided, and a die moving mechanism for performing die spotting is provided.

  In the present invention, a so-called combined mold clamping device is employed in which the mold opening and closing is performed by the mold opening and closing drive device and the mold clamping is performed by the mold clamping drive device. It is The mold clamping device can be compatible with the mold clamping function and the die spotting function for molding by providing a mold clamping drive device and a mold moving mechanism.

  Further, according to the mold clamping device of the present invention, it is preferable that the mold moving mechanism includes a servomotor, and the moving die plate is moved by being driven by the servomotor.

  The servomotor is provided with a detector such as an encoder, and this detector can accurately detect the position of the movable mold supported by the movable die plate. Therefore, when performing die spotting, the mold clamping device detects the position of the movable mold, gradually changes the position of the movable die plate by the moving mechanism according to the detection accuracy, and fixes the movable mold. It can be approached to the mold. When a part of the movable mold contacts the fixed mold, the servomotor can detect the contact position of the movable mold by detecting the fluctuation of the rotational speed or the output torque by the detector. For example, if control is performed to temporarily stop the servomotor at the contact position, the positional relationship between the movable mold and the fixed mold at that time can be maintained, and the state thereof can be confirmed. As a result, it is possible to judge whether the contact state between the movable mold and the fixed mold is good or not, and when a defect is found, it is possible to correct the defective portion promptly.

  Preferably, the servomotors are individually provided so as to correspond to each of the plurality of tie bars and driven independently.

  According to this configuration, a plurality of servomotors are provided to correspond to a plurality of tie bars, and by independently driving each servomotor, the torque of each servomotor can be individually detected. . As a result, if there is a servomotor that has detected a torque different from that of other servomotors when performing die spotting, it can be inferred that contact between the movable mold and the fixed mold occurs around this servomotor. This makes it possible to perform the die spotting operation quickly. Further, by accumulating data of torque of each servomotor, it is also possible to analyze the cause of the contact failure between the movable mold and the fixed mold.

  Further, according to the mold clamping device of the present invention, the mold clamping driving device and the mold moving mechanism may be shared. For example, if the die spotting function of the mold moving mechanism is shared by the mold clamping driving device, the mold moving mechanism can be omitted, whereby the mold clamping device can be further miniaturized.

  Preferably, the mold moving mechanism is attached to the moving die plate. By attaching the mold moving mechanism to the moving die plate in this way, it is possible to attach the mold moving mechanism not only to the case where a molding machine is newly installed but also to the mold clamping device of the existing molding machine. Thus, a highly versatile mold clamping device can be realized.

  Further, according to the mold clamping device in accordance with the present invention, it is possible to adopt a configuration provided with the mold clamping driving device driven by the hydraulic cylinder and the mold moving mechanism driven by the servomotor.

  According to this configuration, the mold clamping drive device can be sufficiently driven by the hydraulic cylinder to secure the mold clamping force of the mold, and the mold moving mechanism is driven by the servomotor. Die spotting can be performed accurately.

  Further, the molding machine according to the present invention can achieve both the mold clamping function for molding and the die spotting function by providing the mold clamping device having the above-described features.

  According to the present invention, the mold clamping function for molding and the die spotting function can be compatible.

It is sectional drawing in the type | mold open state of the die-cast machine which concerns on 1st Embodiment. It is sectional drawing of the die-cast machine in the state which made the movable metal mold approach a stationary metal mold. It is sectional drawing of the die-cast machine in a die-clamping state. It is a sectional view of the clamping drive before clamping. FIG. 6 is a cross-sectional view of a mold clamping drive after mold clamping. It is sectional drawing in the type | mold open state of the die-cast machine which concerns on 2nd Embodiment. It is sectional drawing of the die-cast machine in the state which made the movable metal mold approach a stationary metal mold. It is sectional drawing of the die-cast machine in a die-clamping state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 5 show a first embodiment of a mold clamping device and a molding machine according to the present invention. In the present embodiment, a die casting machine is illustrated as a molding machine. The die casting machine 1 comprises: a mold clamping device 4 for holding the fixed mold 2 and the movable mold 3; an injection apparatus 5 for supplying molten metal to a cavity formed by the fixed mold 2 and the movable mold 3; A control device 6 that controls the device 4 and the injection device 5 is mainly provided.

  As shown in FIGS. 1 to 3, the mold clamping device 4 includes a base 7, a fixed die plate 8 for holding the fixed mold 2, a movable die plate 9 for holding the movable mold 3, and the fixed die plate 8. And a plurality of tie bars 10 hung on the movable die plate 9, a mold opening / closing drive device 11 for opening and closing the movable mold 3 with respect to the fixed mold 2, and the movable mold 3 and the fixed mold 2 And a clamping drive 12 for clamping.

  The base 7 is placed, for example, on the floor of a factory. The fixed die plate 8 and the movable die plate 9 are disposed opposite to each other on the base 7. The fixed die plate 8 supports the fixed die 2 on the die mounting surface facing the moving die plate 9 and is fixed to the base 7. The fixed die plate 8 has a hole 8 a through which the tie bar 10 is inserted.

  The movable die plate 9 supports the movable die 3 on the die mounting surface facing the fixed die plate 8 and moves toward and away from the fixed die plate 8 with respect to the base 7 (die open / close directions A1, A2) It is provided to be movable. The movable die plate 9 has a hole 9 a through which the tie bar 10 is inserted.

  In this mold clamping device 4, the mold closing of the fixed mold 2 and the movable mold 3 is performed by the movement of the movable die plate 9 in the direction (mold closing direction A1) approaching the fixed die plate 8 (see FIG. 3) ). Further, by moving the movable die plate 9 in a direction (mold opening direction A2) separating from the fixed die plate 8, the mold opening of the fixed mold 2 and the movable mold 3 is performed (see FIG. 1).

  The plurality of tie bars 10 are provided, for example, around the fixed mold 2 and the movable mold 3. Specifically, two tie bars 10 are provided at a position above the fixed mold 2 and the movable mold 3, and a tie bar at a position below the fixed mold 2 and the movable mold 3. Two 10 are provided. Therefore, the mold clamping device 4 in the present embodiment includes a total of four tie bars 10. 1 to 3 show two tie bars 10 located on the lower side.

  The four tie bars 10 are, for example, arranged vertically and horizontally symmetrically with the fixed mold 2 and the movable mold 3 as centers. The tie bar 10 has a length that can be hung on the fixed die plate 8 and the movable die plate 9 (for example, can penetrate the fixed die plate 8 and the movable die plate 9) at least in a mold closed state (see FIG. 3) There is. At the end of the tie bar 10, a plurality of protrusions 10a1 and 10a2 are formed at a predetermined pitch. Each protrusion 10 a 1, 10 a 2 is formed in an annular shape along the circumferential direction of the tie bar 10. By forming the plurality of ridges 10a1 and 10a2, the outer surface of both ends of the tie bar 10 is configured to have an uneven shape in the longitudinal direction.

  The mold opening / closing drive device 11 includes a screw shaft 13 provided inside the base 7, a support member 14 for the screw shaft 13, a movable member 15 movable along the screw shaft 13, and a motor for driving the screw shaft 13. (For example, a servomotor) 16 is provided. The screw shaft 13 and the movable member 15 can be configured by a ball screw mechanism.

  One end of the screw shaft 13 is supported by the support member 14, and the other end is connected to the motor 16. Further, the screw shaft 13 is disposed parallel to the tie bar 10 in order to move the movable die plate 9 in the mold opening and closing directions A1 and A2. The support member 14 is fixed to a part of the base 7. The support member 14 is located near the fixed die plate 8 and rotatably supports the end of the screw shaft 13. The movable member 15 is fixed to the movable die plate 9 and has a screw hole (not shown) in which the screw shaft 13 is screwed. The movable member 15 moves the movable die plate 9 in the mold opening and closing directions A1 and A2 by the rotation of the screw shaft 13.

  The motor 16 is supported by a part of the base 7, and its drive shaft is connected to the end of the screw shaft 13. The motor 16 is connected to the control device 6, and the screw shaft 13 is rotationally driven by its control.

  The fixed die plate 8 is provided with a half nut (hereinafter referred to as “fixed half nut”) 17 for fixing the tie bar 10. The stationary half nut 17 has a plurality of protrusions 17 a engaged with the protrusions 10 a 1 formed at the end of the tie bar 10. Each protrusion 17 a is formed at a predetermined pitch so as to correspond to the protrusion 10 a 1 of the tie bar 10. The fixed half nut 17 is configured to be able to approach / retract (open and close) with respect to the tie bar 10 in the radial direction, and engage (engage) the projection 17 a between the projections 10 a 1 of the tie bar 10. Thus, the tie bar 10 can be immovably fixed (locked) (closed state). Further, the fixed half nut 17 can release this fixing by separating from the tie bar 10 (open state). The stationary half nut 17 can be driven by an actuator such as a hydraulic cylinder (not shown). The stationary half nut 17 is accommodated in the case 18. A portion 18 a of the case 18 is configured such that the end of the tie bar 10 abuts (hereinafter, this portion is referred to as “abutment portion”).

  In the mold opening / closing drive device 11, the screw shaft 13 is rotated by controlling the rotation of the motor 16, and the rotation is converted into the linear motion of the movable member 15. As a result, the movable die plate 9 is driven in the mold opening and closing directions A1 and A2. In addition, although the mold clamping device 4 in this embodiment has two mold opening / closing drive devices 11 as shown in FIG. 1, the invention is not limited to this, and one or three or more according to the size of the die casting machine 1 A mold opening / closing drive 11 can be provided.

  Four clamping drive devices 12 are installed on the back side of the movable die plate 9 corresponding to the four tie bars 10. A corresponding tie bar 10 is inserted in each of the clamping drive devices 12. The mold clamping drive unit 12 includes a moving mechanism 19 for moving the movable die plate 9 so as to be able to approach and move away from the fixed die plate 8, and a servomotor 20 for supplying power to the moving mechanism 19.

  The moving mechanism 19 includes a first gear 21 connected to the servomotor 20, a second gear 22 meshing with the first gear 21, and driven members 23 (23a and 23b) driven by the second gear 22. A half nut (hereinafter referred to as “moving half nut”) 24 for fixing the moving die plate 9 to the tie bar 10 is provided.

  The first gear 21 is connected to the drive shaft of the servomotor 20. In the present embodiment, a spur gear is used for the first gear 21. The second gear 22 is configured by a nut gear. The second gear 22 has a plurality of teeth 25 meshing with the first gear 21 on the outer side, and has an internally threaded portion 26 (26a, 26b). The female screw portion 26 includes a first female screw portion 26 a and a second female screw portion 26 b which are formed separately in the axial center direction of the second gear 22. In the present embodiment, the first female screw 26a is formed as a left screw, and the second female screw 26b is formed as a right screw.

  The driven member 23 includes a first driven member 23a and a second driven member 23b. The first driven member 23 a has a cylindrical portion 27 and a flange portion 28 formed at one end of the cylindrical portion 27. The cylindrical portion 27 has a male screw portion 29 at its outer peripheral portion. The male screw portion 29 is screwed into the first female screw portion 26 a of the second gear 22. The male screw portion 29 is formed as a left screw so as to correspond to the first female screw portion 26a. Further, the tie bar 10 is inserted into the cylindrical portion 27. At the other end of the cylindrical portion 27 (the end opposite to the end where the flange portion 28 is formed), a hole 30 is formed along the cylinder center direction. The flange portion 28 supports the first gear 21, the servomotor 20, and the moving half nut 24.

  The second driven member 23 b is formed in a tubular shape, and one end of the second driven member 23 b is connected to the movable die plate 9. The second driven member 23 b has an external thread 32 at the outer peripheral portion thereof. The externally threaded portion 32 is screwed into the second internally threaded portion 26 b of the second gear 22. The male screw portion 32 is formed as a right-handed screw so as to correspond to the second female screw portion 26b. The tie bar 10 is inserted inside the second driven member 23 b. Further, the second driven member 23 b has, in addition to the hole 33 through which the tie bar 10 is inserted, a through hole 34 penetrating in the cylinder center direction. The guide member 35 is inserted into the through hole 34.

  The guide member 35 guides the second driven member 23b along the cylinder center direction. One end of the guide member 35 is also inserted into the hole 30 of the first driven member 23a. The guide member 35 is fixed to the first driven member 23 a by a fixing tool 36 such as a bolt. When driven by the second gear 22, the first driven member 23 a and the second driven member 23 b are restricted (rotated) from rotating in the circumferential direction of the tie bar 10 by the guide member 35. It can move only in the longitudinal direction.

  As described above, since the clamping drive unit 12 is provided corresponding to each of the four tie bars 10, the servomotors 20 are individually provided for the four tie bars 10. . Each servomotor 20 is controlled to be driven independently by the controller 6.

  The servomotor 20 includes a detector 37 such as a rotary encoder, and a control circuit (driver, positioner, etc.) not shown. The detector 37 can detect the speed or torque of the rotation shaft (rotor) of the servomotor 20. Further, the detector 37 can detect the rotation angle (or the number of rotations) of the rotation shaft of the servomotor 20. The detector 37 transmits the detected value as a signal to the control circuit. Thus, the control circuit can specify the position of the movable mold 3 held by the movable die plate 9.

  The control circuit includes a comparator (not shown). The comparator compares the set target value with the value detected by the detector 37. The control circuit controls (feedback control) the servomotor 20 so that the speed or torque of the servomotor 20 becomes a predetermined value (target value) based on this comparison. Further, the control circuit can stop the servomotor 20 when the detected value is different from the target value.

  As shown in FIG. 4, the moving half nut 24 has a plurality of protrusions 24 a engaged with the protrusions 10 a 2 formed at the end of the tie bar 10. Each protrusion 24 a is formed at a predetermined pitch so as to correspond to the protrusion 10 a 2 of the tie bar 10. The movable half nut 24 is configured to be able to approach / retract (open and close) with respect to the tie bar 10 in the radial direction, and engage (engage) the projecting portion 24 a between the projecting portions 10 a 2 of the tie bar 10. Thereby, the movable die plate 9 can be fixed (locked) to the tie bar 10. Further, by moving the half nut 24 on the moving side away from the tie bar 10, this fixing can be released. The moving half nut 24 can be driven by an actuator such as a hydraulic cylinder (not shown).

  The moving half nut 24 is accommodated in the case 31. The case 31 is fixed to the flange portion 28 of the moving mechanism 19. Thus, the movable half nut 24 is configured integrally with the movable die plate 9.

  As shown in FIGS. 1 to 3, the injection device 5 is provided on the back side of the fixed die plate 8. The injection device 5 penetrates the fixed die plate 8 and communicates with the cavity through the fixed die 2, the injection plunger 39 slidable in the injection sleeve 38, and the injection plunger 39. Mainly includes an injection cylinder 40.

  The control device 6 includes, for example, a computer (for example, a PC) on which various hardware such as a CPU, a ROM, a RAM, and an HDD are mounted. The control device 6 outputs control signals to the mold opening / closing drive device 11, the mold clamping drive device 12, the actuator of the stationary half nut 17 and the movable half nut 24 in the clamping device 4, and the injection device 5. Execute control. In particular, the control device 6 executes control to independently drive the four servomotors 20 corresponding to the four mold clamping drive devices 12 respectively. Further, the control device 6 receives the torque value detected by the detector 37 of the servomotor 20, and monitors each servomotor 20 while storing data of the torque value.

  Hereinafter, a method of casting a product (operation in a molding cycle) using the die casting machine 1 configured as described above will be described.

  At the start of the molding cycle, as shown in FIG. 1, the movable die plate 9 is at an appropriately set mold opening position, and the fixed mold 2 and the movable mold 3 are in a separated state. The fixed half nut 17 is open and does not fix the tie bar 10. On the other hand, the moving half nut 24 is closed, and the moving die plate 9 is fixed to the tie bar 10. Further, the mold clamping drive device 12 is in a standby state, and as shown in FIG. 4, the first driven member 23a and the second driven member 23b are adjacent to each other. From this state, the motor 16 of the mold opening / closing drive device 11 is operated by the control of the control device 6 to rotate the screw shaft 13. As the screw shaft 13 rotates, the movable member 15 moves toward the fixed die plate 8, and the movable die plate 9 approaches the fixed die plate 8.

  Since the tie bar 10 is fixed to the movable die plate 9, it moves in the mold closing direction A1 together with the movable die plate 9. As shown in FIG. 2, the tie bar 10 brings one end of the tie bar 10 into contact with the contact portion 18a. Then, the control device 6 operates the stationary half nut 17 and engages with the projection 10 a 1 of the tie bar 10 to lock it. In this state, the movable die plate 9 approaches the fixed die plate 8, whereby the movable mold 3 approaches the fixed mold 2 and stops immediately before the fixed mold 2 (see FIG. 2).

  Next, the control device 6 operates the servomotor 20 of the clamping drive 12 to start clamping. When the servomotor 20 operates, the moving mechanism 19 is thereby started, and the first driven member 23a and the second driven member 23b are driven by the first gear 21 and the second gear 22. Thereby, the first driven member 23a and the second driven member 23b are relatively separated as shown in FIG. Although the maximum separation distance between the first driven member 23a and the second driven member 23b is set to 60 mm in the present embodiment, the present invention is not limited to this. Due to this separation, the clamping drive 12 brings the movable die plate 9 closer to the stationary die plate 8. The movable mold 3 gradually approaches the fixed mold 2 and makes mold contact. Thereby, the movable mold 3 is pressed against the fixed mold 2 by a predetermined mold clamping force generated by the driving force of the servomotor 20 (see FIG. 3).

  When the clamping force reaches a predetermined value and clamping is completed, the control device 6 controls the injection device 5 to supply the molten metal to the cavity. That is, the molten metal is supplied to the injection sleeve 38 communicating with the cavities of the molds 2 and 3 by ladle or the like, and the injection plunger 39 is advanced by the injection cylinder 40 in the injection sleeve 38. Thereby, the molten metal is injected and filled into the cavity. Then, the molten metal filled in the cavity solidifies to form a molded article having a predetermined shape.

  When the molten metal solidifies and a molded product is formed, the control device 6 reverses the servomotor 20 of the clamping drive 12 to separate the movable die plate 9 from the fixed die plate 8. Thereafter, under the control of the control device 6, the fixed half nut 17 is opened, and the fixing of the tie bar 10 is released. Thereafter, the control device 6 operates the motor 16 of the mold opening / closing drive device 11 to move the movable die plate 9 in the mold opening direction A2. Thereby, the mold opening is performed, and the molds 2 and 3 return to the mold open state shown in FIG.

  Next, an implementation method of the die spotting by the mold clamping device 4 of the die casting machine 1 will be described.

  This die spotting is performed to confirm whether the engagement between the movable mold 3 and the fixed mold 2 is as intended. The paint is applied to one of the movable mold 3 and the fixed mold 2 and the paint adheres to the other mold when these come in contact, so that the contact point is confirmed Can. In order to accurately grasp the contact point, it is necessary to control the positions of the movable die plate 9 and the movable mold 3 with high accuracy by the clamping drive unit 12. In the present embodiment, although the accuracy of the position adjustment of the movable mold 3 by the clamping drive 12 is 0.05 mm or less, it is not limited to this.

  To carry out the die spotting, the control device 6 first operates the mold opening / closing drive device 11 to move the movable die plate 9 in the mold closing direction A1 from the mold open state shown in FIG. After moving the movable die plate 9 sufficiently close to the fixed die plate 8 (see FIG. 2), the control device 6 temporarily stops the movable die plate 9 and drives from the mold opening / closing drive device 11 to the clamping drive device 12. Switch to drive by The clamping drive 12 operates the servomotor 20 to move the movable die plate 9 in the mold closing direction A1 via the moving mechanism 19. Thus, the movable mold 3 gradually approaches the fixed mold 2.

  In the servomotor 20, torque detection is performed by the detector 37, and when the detector 37 detects a change in torque, the control device 6 temporarily stops the servomotor 20. That is, the mold clamping device 4 detects a fluctuation in torque when the movable mold 3 contacts the fixed mold 2, and temporarily stops the servomotor 20. The servomotor 20 transmits position data (torque data) at this time to the control device 6 through the control circuit, and the control device 6 keeps monitoring the servomotor 20 while storing the data. If the contact between the movable mold 3 and the fixed mold 2 is poor, the movable mold 3 and the fixed mold 2 are subjected to processing for eliminating this.

  In addition, this mold clamping device 4 can perform die spotting in hot as well as die spotting in cold. That is, after the above-mentioned die spotting is performed coldly, and the engagement state of the movable mold 3 and the fixed mold 2 is adjusted, molding with the molds 2 and 3 is performed by the die casting machine 1. The molds 2 and 3 are heated by the molten metal during this molding, and cause some thermal deformation. The mold clamping device 4 can confirm by die spotting whether or not the engagement between the movable mold 3 and the fixed mold 2 is appropriate even after the molds 2 and 3 are deformed. Alternatively, when defects such as burrs occur in a molded article, the cause can be identified by die spotting.

  According to the mold clamping device 4 according to the present embodiment described above, the servomotor 20 is adopted as a drive source of the mold clamping drive device 12, and the position of the movable die plate 9 can be finely adjusted by feedback control. Thereby, the position of the movable mold 3 can be changed with high accuracy, and desired die spotting can be realized. As a result, the mold clamping device 4 can achieve both the mold clamping function for molding and the die spotting function.

  In addition, by adopting the servomotor 20 as a drive source of the mold opening / closing drive device 11 and a drive source of the mold clamping drive device 12, the size thereof is significantly larger than that of the conventional toggle mechanism type clamping device. It can be miniaturized. Moreover, since the mold clamping device 4 is integrally incorporated into the molding machine, there is no need to secure a space for installing a separate die spotting machine in a factory or the like. Furthermore, since die spotting can be realized only by attaching the clamping drive 12 to the movable die plate 9 and the tie bar 10, in addition to the case where a molding machine is newly installed, it can be easily incorporated into an existing molding machine Will also be possible. By doing this, the introduction cost (initial cost) of a molding machine having a die spotting function can be significantly reduced, and accordingly, the manufacturing cost of the mold and hence the manufacturing cost of the product can be reduced as much as possible. .

  Further, by individually providing the servomotors 20 so as to correspond to the four tie bars 10 and independently driving each servomotor 20, it is possible to individually detect the torque of each servomotor 20. As a result, when one of four servo motors 20 detects a torque different from that of the other three servo motors 20 at the time of die spotting execution, the movable die 3 is movable around this servo motor 20. It can be inferred that contact with the fixed mold 2 has occurred. As described above, by separately detecting the torques of the four servomotors 20, the contact position between the movable mold 3 and the fixed mold 2 can be found at an early stage, and thereby the die spotting operation can be performed quickly. It will be possible. Furthermore, storing the torque data of each servomotor 20 in the control device 6 makes it possible to analyze the cause of the contact failure between the movable mold 3 and the fixed mold 2.

  6 to 8 show a second embodiment of a mold clamping device and a molding machine according to the present invention. In the first embodiment described above, the clamping driving device 12 of the clamping device 4 has (shared) the functions of both clamping and die spotting of the molds 2 and 3, but the present embodiment The mold clamping device 4 is configured to perform mold clamping and die spotting by separate devices. Specifically, the mold clamping device 4 includes a hydraulic mold clamping drive device 41 and a die moving mechanism 42 (die spotting drive device) for performing die spotting. The other configurations of the die casting machine 1 and the clamping device 4 according to the present embodiment are the same as those of the first embodiment, and the same components as the first embodiment are denoted by the same reference numerals. .

  The clamping drive 41 includes a clamping cylinder 43 and a half nut 44 for fixing the tie bar 10.

  The mold clamping cylinder 43 is constituted by a hydraulic cylinder. In the present embodiment, a hydraulic cylinder is used as the mold clamping cylinder 43. The mold clamping cylinder 43 includes a piston 45 and two cylinder chambers 43a and 43b for moving the piston 45. Hereinafter, one cylinder chamber 43a is referred to as a first cylinder chamber, and the other cylinder chamber 43b is referred to as a second cylinder chamber. The mold clamping cylinder 43 moves the piston 45 in the mold closing direction A1 by pressing the hydraulic oil into the first cylinder chamber 43a. The mold clamping cylinder 43 moves the piston 45 in the mold opening direction A2 by pressing the hydraulic oil into the second cylinder chamber 43b.

  The half nut 44 is for fixing the piston 45 to the tie bar 10 or releasing the fixation, and is integrally provided to the piston 45. The half nut 44 has the same configuration as the fixed half nut 17 in the first embodiment. That is, the half nut 44 is accommodated in the case 46 and has a plurality of protrusions 44 a engaged with the protrusions 10 a 1 formed at the end of the tie bar 10. Similar to the case 18 of the first embodiment, the case 46 has an abutting portion 46a with which the end of the tie bar 10 abuts.

  The mold moving mechanism 42 has the same configuration as the mold clamping drive device 12 in the first embodiment. That is, as in the first embodiment, the die moving mechanism 42 includes the moving mechanism 19 and the servomotor 20 for supplying power to the moving mechanism 19. The moving mechanism 19 and the servomotor 20 are the same as the configurations shown in FIGS. 4 and 5.

  Hereinafter, a method of casting a product (operation in a molding cycle) using the die casting machine 1 according to the present embodiment will be described.

  At the start of the molding cycle, as shown in FIG. 6, the movable die plate 9 is at an appropriately set mold opening position, and the fixed mold 2 and the movable mold 3 are in a separated state. The half nut 44 of the clamping drive 41 is closed, and the piston 45 of the clamping drive 41 is fixed to the tie bar 10. Further, the moving half nut 24 is opened, and the moving die plate 9 is movable in the longitudinal direction of the tie bar 10. From this state, the motor 16 of the mold opening / closing drive device 11 is operated by the control of the control device 6 to rotate the screw shaft 13. The rotation of the screw shaft 13 moves the movable member 15 toward the fixed die plate 8, and the movable die plate 9 approaches the fixed die plate 8 along the longitudinal direction of the tie bar 10.

  As shown in FIG. 7, when the movable mold 3 supported by the movable die plate 9 moves to a moldable position, the control device 6 stops the mold opening / closing drive device 11. Next, the control device 6 operates the mold clamping cylinder 43 of the mold clamping drive device 41 to start mold clamping. Specifically, the movable half nut 24 is closed and the movable die plate 9 is fixed to the tie bar 10 under the control of the controller 6. The half nut 44 of the clamping drive 41 is in a closed state.

  Thereafter, hydraulic fluid is pressed into the first cylinder chamber 43a of the mold clamping cylinder 43, and the piston 45 moves in the mold closing direction A1. As a result, the tie bar 10 moves in the mold closing direction A1, and along with this movement, the moving die plate 9 further approaches the fixed die plate 8. The movable mold 3 gradually approaches the fixed mold 2 and makes mold contact. Thereby, the movable mold 3 is pressed against the fixed mold 2 by a predetermined mold clamping force generated by the driving force of the mold clamping cylinder 43 (see FIG. 8).

  When the mold clamping force reaches a predetermined value and mold clamping is completed, the molten metal is supplied to the cavity by the injection device 5 as in the first embodiment, and the molten metal filled in the cavity solidifies to a predetermined shape. Is formed.

  When the molten metal solidifies and a molded product is formed, the mold clamping cylinder 43 presses the hydraulic oil into the second cylinder chamber 43b to move the piston 45 in the mold opening direction A2. By this movement, the movable die plate 9 also moves in the mold opening direction A2, and the movable mold 3 separates from the fixed mold 2. Thereafter, under the control of the control device 6, the movable half nut 24 is opened, and the fixing of the tie bar 10 is released. Thereafter, the control device 6 operates the motor 16 of the mold opening / closing drive device 11 to move the movable die plate 9 in the mold opening direction A2. Thereby, the mold opening is performed, and the molds 2 and 3 return to the mold open state shown in FIG.

  Next, an implementation method of the die spotting by the mold clamping device 4 of the die casting machine 1 according to the present embodiment will be described.

  As in the first embodiment, one of the movable mold 3 and the fixed mold 2 is coated with a paint (such as light pigment), and when these are in contact, the paint adheres to the other mold. , The contact point can be confirmed.

  The control device 6 operates the mold opening / closing drive device 11 in a state where the movable half nut 24 is opened, and moves the movable die plate 9 in the mold closing direction A1 from the mold open state shown in FIG. After moving the movable die plate 9 sufficiently close to the fixed die plate 8 (see FIG. 7), the controller 6 stops the movable die plate 9, and then the movable half nut 24 is in a closed state. Furthermore, the control device 6 switches the drive by the mold opening / closing drive device 11 to the drive by the mold moving mechanism 42. The mold moving mechanism 42 operates the servomotor 20 to drive the moving mechanism 19. By the operation of the moving mechanism 19, the movable mold 3 gradually approaches the fixed mold 2. Thereafter, die spotting is performed in the same procedure as the first embodiment. During the die spotting, the clamping drive 41 does not operate.

  According to the mold clamping device 4 according to the second embodiment described above, by providing the mold clamping drive device 41 and the mold moving mechanism 42, the mold clamping function and the die spotting function are compatible. .

When the mold clamping device 4 according to the second embodiment and the mold clamping device 4 according to the first embodiment are compared, in the mold clamping device 4 according to the first embodiment, the mold moving mechanism as in the second embodiment 42 is not provided, and the die spotting function of the die moving mechanism 42 is provided in the clamping drive 12. That is, in the mold clamping device 4 according to the first embodiment, it can be said that the mold clamping function and the die spotting function are shared by one mold clamping drive device 12. By thus sharing the mold clamping drive device 41 and the mold moving mechanism 42 in the second embodiment, the mold clamping device 4 in the first embodiment and the mold clamping device 4 in the second embodiment can be used. In comparison, the structure is simplified, the size can be reduced, and the manufacturing cost can be reduced.

  The mold clamping device and the molding machine according to the present invention are not limited to the configuration of the above-described embodiment, and are not limited to the above-described effects. Various modifications can be made to the mold clamping device and the molding machine according to the present invention without departing from the scope of the present invention.

  Although the above-mentioned embodiment showed the example to which mold clamping device 4 was applied to die-cast machine 1, it is not limited to this, the present invention is applied to various molding machines, such as other injection molding machines and press molding machines. It is possible. The clamping device 4 can be used not only for the above-described horizontal forming machine (die casting machine 1) but also for a vertical forming machine.

  In the above embodiment, the mold opening / closing drive device 11 drives the movable die plate 9 by rotating the screw shaft 13 with the motor 16, but the present invention is not limited to this. For example, a hydraulic cylinder, a toggle link mechanism or the like may be adopted as the mold opening / closing drive device 11.

  In the second embodiment described above, although the mold clamping device 4 separately includes the hydraulic mold clamping drive device 41 and the die moving mechanism 42 for die spotting, the invention is not limited thereto. For example, the mold clamping device 4 according to the second embodiment is an electric mold clamping drive that moves the movable die plate 9 by being driven by a servomotor instead of the hydraulic mold clamping drive device 41. An apparatus can be provided.

  In the second embodiment described above, an example of the mold clamping device 4 separately provided with the mold clamping drive device 41 and the mold moving mechanism 42 for performing die spotting is shown, and in the first embodiment, the mold clamping drive Although the example of the mold-clamping apparatus 4 which shared the mold-clamping function and the die spotting function by the apparatus 12 was shown, this invention is not limited to these forms. For example, mold clamping and die spotting may be performed by the mold moving mechanism 42 in the second embodiment. Similarly, the mold clamping drive device 41 in the second embodiment may be configured by a hydraulic servo mechanism, and mold clamping and die spotting may be performed.

  In the second embodiment described above, a hydraulic cylinder is illustrated as the mold clamping cylinder 43, but the present invention is not limited to this, and a hydraulic cylinder operated with various working fluids other than the working oil can be used.

1 Die casting machine (forming machine)
DESCRIPTION OF SYMBOLS 2 fixed mold 3 moving mold 4 mold clamping apparatus 8 fixed die plate 9 moving die plate 10 tie bar 11 mold opening / closing driving apparatus 12 mold clamping driving apparatus 19 moving mechanism 20 servo motor 41 mold clamping driving apparatus 42 mold movement Mechanism 43 Clamping cylinder (hydraulic cylinder)

Claims (6)

A stationary die plate for supporting a stationary mold;
A moving die plate for supporting a movable mold;
A plurality of tie bars suspended between the fixed die plate and the movable die plate;
A mold opening / closing drive device for moving the movable die plate to open and close the movable mold relative to the fixed mold;
A clamp driving device for moving the movable die plate to clamp the movable mold and the fixed mold;
And a die moving mechanism for performing die spotting ;
It said mold moving mechanism, mold clamping device according to claim Rukoto moving the movable die plate by comprising a servo motor, is driven to the servo motor. The mold clamping device according to claim 1 , wherein the servomotors are individually provided so as to correspond to the plurality of tie bars and driven independently. The mold clamping apparatus according to claim 1 or 2, wherein the mold clamping driving device and the mold moving mechanism are shared. The mold clamping device according to claim 3 , wherein the mold moving mechanism is attached to the moving die plate. Mold clamping apparatus according to claim 1, characterized in that it comprises the clamping drive equipment driven by hydraulic cylinders. A molding machine comprising the mold clamping device according to any one of claims 1 to 5 .

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