JP2009255592A - Method for adjusting mold thickness - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a mold-clamping apparatus to be adjustable to generate prescribed mold-clamping force readily and in a short time when a mold unit is exchanged, even if the mold unit is exchanged to one different in thickness such that the mold-clamping apparatus is automatically moved to a position generating the prescribed mold-clamping force by driving a mold thickness motor and a mold-clamping motor. <P>SOLUTION: The method for adjusting the mold thickness comprises calculating the position of a movable platen based on a detecting signal of a mold opening/closing positional sensor at the time of attaching a mold unit; asking a required distance for mold clamping corresponding to the difference between the calculated position of the movable platen and the position of the movable platen corresponding to the crosshead position at the finish of mold clamping; and moving a toggle-type mold-clamping apparatus supporter by a required distance for mold clamping. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an automatic mold clamping force adjusting device for a molding machine.

  Conventionally, in a molding machine such as an injection molding machine, a resin heated and melted in a heating cylinder is injected at a high pressure to fill the cavity space of the mold apparatus, and the resin is filled in the cavity space. The molded product is formed by cooling and solidifying.

  For this purpose, the mold apparatus is composed of a fixed mold and a movable mold, and the movable mold is advanced and retracted by the mold clamping apparatus, and is brought into and out of contact with the fixed mold. The mold can be opened. The mold clamping device includes a fixed platen to which a fixed mold is attached, a movable platen to which a movable mold is attached, and a toggle mechanism for moving the movable platen forward and backward, and operates the toggle mechanism. By moving the movable platen back and forth, the mold apparatus is closed, clamped and opened. (For example, refer to Patent Document 1.)

JP 2002-337184 A

However, in the conventional molding machine, when the mold apparatus is replaced with one having a different thickness, the toggle mechanism is almost extended to adjust the mold clamping force by the mold clamping apparatus to be appropriate. Since the mold thickness motor is driven to move the movable platen by an adjustment distance corresponding to the difference in thickness of the mold apparatus, it takes time to replace the mold apparatus.

  A toggle mechanism widely used as a booster in a mold clamping device of a molding machine is configured to change a force generated by a link angle, that is, a mold clamping force. Therefore, even when the mold apparatus is replaced with one having a different thickness, the link angle in the mold closed state of the mold apparatus needs to be a predetermined angle so as to generate a predetermined mold clamping force. . However, in order to adjust the link angle in the mold closed state of the mold apparatus to a predetermined angle, the toggle mechanism is attached so that the position of the movable platen is a position corresponding to the mold closed state of the mold apparatus. While driving the mold thickness motor that moves the base plate along the tie bar to move the entire mold clamping drive unit, the mold clamping motor that operates the toggle mechanism is driven so that the link angle becomes a predetermined angle. It takes a long time to do so.

  Therefore, when exchanging the mold apparatus, the mold thickness motor is driven while the link angle of the toggle mechanism in the mold closed state of the mold apparatus before the exchange is maintained, that is, the toggle mechanism is almost extended. Retract the entire tightening drive. In this case, the mold apparatus before replacement is detached from the movable platen and attached to the fixed platen while the mold is closed. Then, after the replacement mold apparatus is attached to the stationary platen instead of the replacement mold apparatus, the mold thickness motor is driven without driving the mold clamping motor, and the toggle mechanism and the movable platen are driven. The whole mold clamping device including At this time, even if the mold apparatus is replaced with one having a different thickness by moving the entire mold clamping apparatus forward or backward by an adjustment distance corresponding to the difference in thickness of the mold apparatus before and after replacement, The mold clamping force by the clamping device is appropriate.

  However, in the conventional molding machine, the adjustment distance corresponding to the difference in thickness of the mold apparatus is grasped visually or measured using a measure. In addition, the driving amount of the mold thickness motor for moving the adjustment distance is set manually, or the mold thickness motor is operated manually while observing that the movable platen moves by the adjustment distance. It has become. Therefore, it takes time to replace the mold apparatus.

  The present invention is a case where the mold apparatus is replaced with one having a different thickness by driving the mold thickness motor and the mold clamping motor when the mold apparatus is replaced by solving the conventional problems. However, an object of the present invention is to provide a mold thickness adjusting device that can easily and quickly adjust the mold thickness.

  Therefore, in the mold thickness adjusting method of the present invention, the position of the movable platen is calculated based on the detection signal of the mold opening / closing position sensor when the mold apparatus is attached, and the calculated position of the movable platen and the crosshead position are calculated. A required mold clamping distance corresponding to a difference from the movable platen position corresponding to the mold clamping completion position is obtained, and the toggle type clamping apparatus supporting device is moved by the mold clamping necessary distance.

  In another mold thickness adjusting method of the present invention, after the toggle type mold clamping device supporting device is moved, the cross head is retracted by a cross head mold clamping process distance, and the movable platen is moved to the cross head mold clamping process. 2. The mold thickness adjusting method according to claim 1, wherein the platen mold clamping process distance corresponding to the distance is retracted, and the toggle type mold clamping apparatus support device is advanced by the platen mold clamping process distance.

  According to the present invention, in the mold thickness adjusting method, the position of the movable platen is calculated based on the detection signal of the mold opening / closing position sensor when the mold apparatus is attached, and the calculated position of the movable platen and the crosshead position are calculated. A required mold clamping distance corresponding to a difference from the movable platen position corresponding to the mold clamping completion position is obtained, and the toggle type clamping apparatus supporting device is moved by the mold clamping necessary distance.

  In this case, when the mold apparatus is replaced, the mold thickness motor and the mold clamping motor are driven, so that even when the mold apparatus is replaced with one having a different thickness, easily and in a short time. Mold thickness can be adjusted.

  Further, in another mold thickness adjusting method, after the toggle type mold clamping device support device is moved, the cross head is retracted by a cross head mold clamping process distance, and the movable platen is adapted to the cross head mold clamping process distance. By moving the toggle type mold clamping device support device forward by the platen mold clamping process distance, the mold clamping force can be adjusted in a shorter time.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The automatic mold clamping force adjusting device for a molding machine according to the present invention can be applied to various molding machines such as an extrusion molding machine, a laminator, a transfer molding machine, a die cast machine, and an IJ sealing press. In the present embodiment, for convenience of explanation, a case where the present invention is applied to an injection molding machine will be described.

  FIG. 1 is a schematic view of a mold clamping device of an injection molding machine according to a first embodiment of the present invention.

  In the figure, reference numeral 10 denotes a mold clamping device of an injection molding machine. Reference numeral 17 denotes a frame, 12 denotes a fixed platen as a fixed mold support device fixed to the frame 17, and 15 is movable with respect to the frame 17 at a predetermined distance from the fixed platen 12. It is a toggle support as a base plate disposed in the box. The toggle support 15 functions as a toggle type mold clamping device support device. Reference numeral 16 denotes a plurality of, for example, four, tie bars provided between the fixed platen 12 and the toggle support 15 as guide means.

  Reference numeral 13 denotes a movable platen as a movable mold support device which is disposed so as to face the fixed platen 12 and which can be moved back and forth (moved in the horizontal direction in the drawing) along the tie bar 16. Reference numeral 11 denotes a mold apparatus, which includes a fixed mold 11a and a movable mold 11b. A fixed mold 11a is attached to a mold mounting surface of the fixed platen 12 facing the movable platen 13, and a movable mold 11b is mounted to a mold mounting surface of the movable platen 13 facing the fixed platen 12. Is attached.

  A drive device for moving an ejector pin (not shown) may be attached to the rear end (left end in the figure) of the movable platen 13.

  A toggle mechanism 20 as a toggle type mold clamping device is attached between the movable platen 13 and the toggle support 15, and a mold clamping drive for operating the toggle mechanism 20 at the rear end of the toggle support 15. A mold clamping motor 26 as a source is provided. The mold clamping motor 26 is provided with a motion direction conversion device (not shown) composed of a ball screw mechanism or the like that converts rotational motion into reciprocating motion. The mechanism 20 can be activated. The mold clamping motor 26 is preferably a servo motor, and includes a mold opening / closing position sensor 27 as an encoder for detecting the number of rotations.

  Here, the toggle mechanism 20 is swingably attached to the crosshead 24 attached to the drive shaft 25, the second toggle lever 23 attached to the crosshead 24 so as to be swingable, and the toggle support 15. The first toggle lever 21 and a toggle arm 22 that is swingably attached to the movable platen 13. Then, the first toggle lever 21 and the second toggle lever 23 and the first toggle lever 21 and the toggle arm 22 are linked with each other. The toggle mechanism 20 is a so-called inner volume five-node double toggle mechanism, and has a vertically symmetrical configuration.

  The toggle mechanism 20 can be operated by driving the mold clamping motor 26 and moving the cross head 24 as a driven member forward and backward. In this case, when the cross head 24 is moved forward (moved in the right direction in the figure), the movable platen 13 is moved forward to perform mold closing. A mold clamping force obtained by multiplying the propulsive force of the mold clamping motor 26 by a toggle magnification is generated, and the mold clamping is performed by the mold clamping force.

  A mold clamping position adjusting device 35 is disposed at the rear end (left end in the figure) of the toggle support 15 in order to adjust the position of the toggle support 15 with respect to the fixed platen 12. Here, a plurality of, for example, four tie bar insertion holes (not shown) are formed in the toggle support 15, and the left end of the tie bar 16 in the figure is inserted into each of the tie bar insertion holes. A right end (not shown) of the tie bar 16 is fixed to the fixed platen 12 by a fixing nut 16a.

  The tie bar 16 has a screw portion 36 formed with a screw on the outer periphery of the left end in the drawing, and an adjustment nut 37 is screwed to the screw portion 36 of each tie bar 16. The adjustment nut 37 is attached to the rear end of the toggle support 15 so as to be rotatable and immovable in the axial direction of the tie bar 16. A driven gear 37 a is attached to the outer periphery of the adjustment nut 37.

  Further, a mold thickness motor 31 as a mold clamping position adjusting drive source is disposed at an upper portion of the rear end of the toggle support 15. A drive gear 33 is attached to the rotating shaft of the mold thickness motor 31. Here, a drive linear body 34 such as a chain or a toothed belt is wound around the driven gear 37 a and the driving gear 33 of the adjustment nut 37. Therefore, when the mold thickness motor 31 is driven and the driving gear 33 is rotated, the adjustment nuts 37 screwed into the screw portions 36 of the tie bars 16 are rotated in synchronization. As a result, the mold thickness motor 31 can be rotated in a predetermined direction by a predetermined number of rotations, and the toggle support 15 can be advanced and retracted by a predetermined distance. The mold thickness motor 31 is preferably a servo motor, and includes a mold clamping position sensor 32 as an encoder for detecting the rotation speed.

  By the way, the means for transmitting the rotation of the mold thickness motor 31 to the adjusting nut 37 is any means as long as the adjusting nut 37 screwed into the threaded portion 36 of each tie bar 16 can be rotated synchronously. For example, instead of the driving linear body 34, a large-diameter gear that meshes with all of the driving gear 33 and the driving gear 33 is rotated to the rear end of the toggle support 15. It can also be arranged.

  Next, the operation characteristics of the toggle mechanism 20 will be described.

  FIG. 2 is an enlarged view of a main part of the toggle mechanism according to the first embodiment of the present invention, and FIG. 3 is a diagram showing the relationship between the position of the crosshead and the link angle of the toggle mechanism according to the first embodiment of the present invention. FIG. 4 is a diagram showing the relationship between the position of the crosshead of the toggle mechanism and the mold clamping force in the first embodiment of the present invention. In FIG. 3, the horizontal axis represents the crosshead position, the vertical axis represents the link angle, and in FIG. 4, the horizontal axis represents the crosshead position, and the vertical axis represents the clamping force.

  When closing the mold in the mold clamping device 10, the crosshead 24 moves forward when the mold clamping motor 26 is driven, and in the direction indicated by the arrow B along the central axis A of the toggle mechanism 20 as shown in FIG. 2. Moving. At this time, the link angle θ as the angle between the longitudinal central axis C of the toggle arm 22 and the longitudinal central axis D of the first toggle lever 21 decreases as the cross head 24 advances.

  In this case, the position of the cross head 24 and the link angle θ change as shown by a curve E shown in FIG. In FIG. 3, the position of the crosshead 24 is the position with respect to the toggle support 15, and the most retracted position (position moved to the leftmost in FIG. 1) is 0 (zero), and the numerical value increases as it moves forward. It has come to increase. The position indicated by the line F indicates the mold clamping completion position as the position of the crosshead 24 corresponding to the state where the mold clamping of the mold apparatus 10 is completed. When the cross head 24 is in the mold clamping completion position, the movable platen 13 is also in the mold clamping completion position. When the cross head 24 is in the mold clamping completion position, the toggle mechanism 20 is substantially extended, and the toggle arm 22 and the first toggle lever 21 are substantially linear. However, microscopically, when the position of the cross head 24 is at the mold clamping completion position, the link angle θ is a knicking amount as an angle indicated by β. That is, in a state where the mold clamping of the mold apparatus 10 is completed, the toggle arm 22 and the first toggle lever 21 are not completely linear, and are slightly inclined by the knicking amount β.

  Further, the position indicated by the line G in FIG. 3 indicates the mold closed position as the position of the cross head 24 corresponding to the mold closed state of the mold apparatus 10. When the cross head 24 is in the mold closed position, the movable platen 13 is also in the mold closed position. Further, α is the crosshead mold clamping process distance as a difference between the mold clamping completion position and the mold closing position. The crosshead mold clamping process distance α is changed according to the mold clamping force generated by the toggle mechanism 20. Therefore, the mold closing position is also changed according to the mold clamping force.

  Since the relationship between the position of the cross head 24 and the position of the movable platen 13 to which the movable mold 11b is attached is known in advance based on the characteristics of the toggle mechanism 20, the position of the cross head 24 is Based on this, the position of the mold mating surface (parting surface) of the movable mold 11b can be grasped. Therefore, the relationship between the position of the mold mating surface of the movable mold 11b and the link angle θ can be grasped based on the characteristic indicated by the curve E in FIG.

  Further, the position of the cross head 24 and the mold clamping force generated by the toggle mechanism 20 change as shown by a curve H shown in FIG. Also in FIG. 4, as in FIG. 3, the position of the crosshead 24 increases as the position advances. Further, the position indicated by the line I indicates the mold clamping completion position as the position of the cross head 24 corresponding to the state where the mold clamping of the mold apparatus 10 is completed. The position of the cross head 24 shown in FIG. 4 is an enlarged view of the vicinity of the mold clamping completion position. Further, the mold clamping force changes in accordance with the crosshead mold clamping process distance α from the mold closing of the mold apparatus 10 to the completion of the mold clamping, and the curve H shown in FIG. 4 shows a qualitative change. Is.

  Since the position of the mold mating surface of the movable mold 11b can also be grasped based on the position of the cross head 24, the mold of the movable mold 11b is based on the characteristic indicated by the curve H in FIG. It is also possible to grasp the relationship between the position of the mating surface and the clamping force.

  Incidentally, in the present embodiment, the mold clamping force generated by the toggle mechanism 20 is the entire mold clamping apparatus 10 including the fixed platen 12, the toggle support 15, and the tie bar 16, as in the mold clamping apparatus using a general toggle mechanism. The spring constant, i.e., the mold clamping rigidity is changed as a proportional constant. In the mold clamping device 10, since the rigidity of the tie bar 16 is lower than that of other members, it can be considered that the mold clamping rigidity is equal to the rigidity of the tie bar 16. Therefore, in the present embodiment, the mold clamping force generated by the toggle mechanism 20 is fixed to the toggle support 15 from the mold closing of the mold apparatus 10 to the completion of the mold clamping, with the spring constant as the rigidity of the tie bar 16 as a proportional constant. It can be said that it changes in proportion to the amount of movement with respect to the platen 12. That is, since the rigidity of the members such as the fixed platen 12 and the toggle support 15 is sufficiently high, the mold clamping force generated by the mold clamping device 10 is substantially generated by elastically deforming and extending the four tie bars 16. It can be said that it is proportional to the amount of elongation of the tie bar 16. Further, the extension amount of the tie bar 16 is substantially equal to the platen mold clamping process distance as the movement amount of the movable platen 13 corresponding to the crosshead mold clamping process distance α.

  The link angle θ in a state where the mold clamping of the mold apparatus 10 is completed is constant even if the mold clamping force generated by the toggle mechanism 20 changes. Therefore, the mold clamping completion position of the cross head 24 with respect to the toggle support 15 is also constant even if the mold clamping force generated by the toggle mechanism 20 changes.

  Next, an automatic mold clamping force adjusting device for a molding machine that controls the operation of the mold clamping device 10 will be described.

  FIG. 5 is a diagram showing a configuration of an automatic mold clamping force adjusting device for a molding machine according to the first embodiment of the present invention.

  In FIG. 5, reference numeral 41 denotes a mold thickness adjustment control device which stores a preset mold thickness target value 42 in a storage means, and detects a detection signal of a mold opening / closing position sensor 27, a detection signal of a mold clamping position sensor 32, and the mold. Based on the thickness target value 42, the operation of the mold thickness motor 31 is controlled. The mold thickness target value 42 is the target value of the position of the mold mating surface of the movable mold 11b when the mold clamping is completed, corresponding to the change in the thickness of the mold apparatus 11 (lateral dimension in FIG. 1). It is. Reference numeral 43 denotes a mold clamping force adjustment control device, which stores a preset mold clamping force target value 44 in a storage means, and based on a detection signal of the mold opening / closing sensor 27 and the mold clamping force target value 44, The operation of the fastening motor 26 is controlled. Here, the mold thickness adjustment control device 41 and the mold clamping force adjustment control device 43 are CPU, MPU and other arithmetic means, magnetic disk, storage means such as a semiconductor memory, CRT, display means such as a liquid crystal display, keyboard, etc. Although it is a kind of computer provided with an input means, a communication interface, etc., it may be any device. As the mold thickness adjustment control device 41 and the mold clamping force adjustment control device 43, general-purpose devices such as personal computers, servers, and workstations can be used. In addition, the mold thickness adjustment control device 41 and the mold clamping force adjustment control device 43 may be devices that are independently configured, or may be devices that are integrally configured with each other, It may be one of systems constructed in other control devices or computers. In the present embodiment, it is assumed that the mold thickness adjustment control device 41 and the mold clamping force adjustment control device 43 are incorporated in a control device for an injection molding machine (not shown) that controls the operation of the injection molding machine. The injection molding machine control device includes input means such as an operation panel, and the mold clamping device 10 can be operated manually by an operator operating the input means as required. Yes.

  Here, the mold opening / closing position sensor 27 directly detects the number of rotations of the mold clamping motor 26. However, since the rotational movement of the mold clamping motor 26 is converted into a reciprocating movement of the drive shaft 25 by a motion direction conversion device (not shown) composed of a ball screw mechanism or the like, the rotational speed of the mold clamping motor 26 is detected by detecting the rotational speed. A change in the position of the crosshead 24 attached to the drive shaft 25 can be detected. As described above, since the position of the movable platen 13 and the position of the mold mating surface of the movable mold 11b can be grasped based on the position of the cross head 24, the mold opening / closing position sensor 27 is Based on the detected number of rotations of the mold clamping motor 26, the position of the movable platen 13 relative to the toggle support 15 and the position of the mold mating surface of the movable mold 11b can be detected.

  The mold clamping position sensor 32 directly detects the rotational speed of the mold thickness motor 31. However, since the rotational movement of the mold thickness motor 31 is converted into the reciprocating motion of the toggle support 15 by the adjusting nut 37 and the screw portion 36 of the tie bar 16, the fixed platen motor 31 is detected by detecting the rotational speed of the mold thickness motor 31. A change in the position of the toggle support 15 with respect to 12 can be detected. As described above, the mold clamping completion position of the crosshead 24 with respect to the toggle support 15 is constant, and the position of the mold mating surface of the movable mold 11b is grasped based on the position of the crosshead 24. Therefore, the mold clamping position sensor 32 can detect the position of the mold mating surface of the movable mold 11b when the mold clamping is completed based on the detected rotational speed of the mold thickness motor 31.

  The mold thickness adjustment control device 41 calculates a difference between the mold thickness target value 42 and the position of the mold mating surface of the movable mold 11b detected by the mold opening / closing position sensor 27, and the difference and the mold clamping position sensor. Based on the difference from the position of the mold mating surface of the movable mold 11b detected when the mold clamping is detected by 32, the driving amount (number of rotations) of the mold thickness motor 31 is determined and driven by the driving amount. A command is transmitted to the mold thickness motor 31. As a result, the toggle support 15 moves by an amount corresponding to a change in the thickness of the mold apparatus 11. Therefore, the position of the mold mating surface of the movable mold 11b when the mold clamping is completed changes according to the change in the thickness of the mold apparatus 11.

  In addition, the mold clamping force adjustment control device 43 determines the clamping force of the mold clamping motor 26 based on the difference between the mold clamping force target value 44 and the position of the mold mating surface of the movable mold 11b detected by the mold opening / closing position sensor 27. A driving amount (number of rotations) is determined, and a command is transmitted to the mold clamping motor 26 so as to drive the driving amount. As a result, the toggle support 15 moves to the mold clamping completion position. Therefore, the position of the mold mating surface of the movable mold 11b is a position where a predetermined mold clamping force is generated.

  Next, the operation of the automatic mold clamping force adjusting device for a molding machine having the above configuration will be described. Here, the operation | movement of the metal mold apparatus exchange of the mold clamping apparatus 10 is demonstrated.

  FIG. 6 is a first view showing the operation of exchanging the mold apparatus of the injection molding machine in the first embodiment of the present invention, and FIG. 7 is the mold of the injection molding machine in the first embodiment of the present invention. FIG. 8 is a third diagram showing the operation of exchanging the mold device of the injection molding machine according to the first embodiment of the present invention. FIG. 9 is a diagram showing the operation of exchanging the device. FIG. 10 shows the operation of exchanging the mold apparatus of the injection molding machine in the first embodiment, and FIG. 10 shows the operation of exchanging the mold apparatus of the injection molding machine in the first embodiment of the present invention. FIG.

  First, the operator operates the input means of the injection molding machine control device to operate the mold clamping device 10 to perform mold closing. In this case, the mold clamping motor 26 rotates by a predetermined number of rotations to advance the cross head 24 to a predetermined mold closing position. As a result, the movable platen 13 also moves forward to a predetermined mold closing position, so that the mold mating surface of the movable mold 11b comes into contact with the mold mating surface of the fixed mold 11a and the mold is closed.

  Subsequently, the operator manually attaches the coupling member 14 as shown in FIG. 6 to the side surface of the mold apparatus 11. Here, the coupling member 14 is a member for coupling and integrating the fixed mold 11a and the movable mold 11b in the mold closed state, and the mold apparatus 11 can be attached to the mold clamping apparatus 10 or a mold. When it is removed from the fastening device 10, it is attached to the side surface of the mold device 11. The coupling member 14 is removed during operation of the injection molding machine.

  Subsequently, the operator manually attaches a crane mounting bracket 47 as shown in FIG. 7 to the fixed mold 11a or the movable mold 11b, and the crane mounting bracket 47 includes a crane (not shown) such as an overhead traveling crane. The tip of a linear body 48 such as a wire rope or chain is engaged, and the weight of the mold apparatus 11 is supported by the crane. In addition, when the member which engages the front-end | tip part of the linear body 48 is previously arrange | positioned at the said fixed metal mold | die 11a or the movable metal mold | die 11b, it is not necessary to attach the said crane mounting bracket 47. FIG.

  Subsequently, the operator manually removes the fixed mold 11a and the movable mold 11b from the fixed platen 12 and the movable platen 13, that is, the fixed mold 11a, the movable mold 11b, and the fixed platen 12 respectively. And the engagement with the movable platen 13 is released. Then, the crane is operated, and as shown by an arrow J in FIG. 7, the mold apparatus 11 is lifted upward, taken out from the mold clamping apparatus 10, and moved to a predetermined place such as a mold place.

  Subsequently, the operator operates the crane and moves the mold apparatus 11 ′ after replacement in which the tip of the linear body 48 is engaged with the crane mounting bracket 47 as shown by the arrow K in FIG. And is carried between the fixed platen 12 and the movable platen 13. It is assumed that the mold apparatus 11 ′ after replacement is thicker than the mold apparatus 11 before replacement.

  Subsequently, the operator operates the crane and manually adjusts the posture of the mold apparatus 11 ′ so that the axis of the fixed mold 11 a ′ matches the axis of the fixed platen 12. The operator manually attaches the fixed mold 11a 'to the fixed platen 12, that is, engages the fixed mold 11a' and the fixed platen 12.

  Subsequently, the operator operates the input means of the injection molding machine control device to operate the mold clamping device 10 and advance the movable platen 13. Then, the movable platen 13 is stopped at a position where the mold mounting surface of the movable platen 13 is in contact with the back surface of the movable mold 11b '. The position is the mold closing position of the movable platen 13 in the mold apparatus 11 'after replacement. In this case, since the mold apparatus 11 ′ after the replacement is thicker than the mold apparatus 11 before the replacement, the toggle arm 22 and the first toggle lever 21 are larger at the nodes as shown in FIG. Inclined. That is, the link angle θ is larger than that shown in FIG.

  Subsequently, the operator manually engages the movable mold 11b 'with the movable platen 13. Then, the operator manually removes the tip of the linear body 48 from the crane mounting bracket 47, removes the crane mounting bracket 47 from the fixed mold 11a ′ or the movable mold 11b ′, and removes the coupling member 14 ′ from the mold. Remove from mold device 11 '.

  Subsequently, the operator operates the input means of the injection molding machine control device to activate the molding machine automatic mold clamping force adjustment device. In this case, mold thickness adjustment as approximate position adjustment and mold clamping force adjustment as fine position adjustment are performed. First, mold thickness adjustment is started, and the mold thickness adjustment control device 41 is operated to detect the position of the crosshead 24 based on the detection signal of the mold opening / closing position sensor 27. In this case, since the toggle arm 22 and the first toggle lever 21 are greatly inclined at the nodes and the link angle θ is large, the crosshead 24 is clamped as shown by the curve E shown in FIG. It is in a position retracted from the completion position. Therefore, the mold thickness adjustment control device 41 operates the mold thickness motor 31 to retract the toggle support 15 so that the cross head 24 can be moved to the mold clamping completion position.

  In this case, the mold thickness adjustment control device 41 determines the difference between the position of the movable platen 13 detected based on the detection signal of the mold opening / closing position sensor 27 and the position of the movable platen 13 corresponding to the mold clamping completion position of the cross head 24. The number of rotations of the mold thickness motor 31 required to move the toggle support 15 backward is calculated by the distance necessary for clamping as the distance corresponding to the above, and the mold thickness motor 31 is rotated by the number of rotations. As a result, the toggle support 15 retreats by the necessary clamping distance, so that the mold mating surface of the movable mold 11b ′ is separated from the mold mating surface of the fixed mold 11a ′, and the mold of the movable mold 11b ′. A gap corresponding to the above-described required distance for mold clamping is generated between the mold mating surface and the mold mating surface of the fixed mold 11a ′.

  Subsequently, the mold clamping force adjustment control device 43 is operated, and the mold clamping motor 26 is operated based on the detection signal of the mold opening / closing position sensor 27 so that the position of the cross head 24 becomes the mold clamping completion position. In this case, the mold clamping force adjustment control device 43 moves the cross head 24 by a distance corresponding to the difference between the position of the cross head 24 detected based on the detection signal of the mold opening / closing position sensor 27 and the mold clamping completion position. The number of rotations of the mold clamping motor 26 necessary for this is calculated, and the mold clamping motor 26 is rotated by the number of rotations. Then, the movable platen 13 advances by the necessary distance for mold clamping. Then, the mold mating surface of the movable mold 11b 'and the mold mating surface of the fixed mold 11a' are brought into contact with each other to perform mold closing. At this time, the toggle arm 22 and the first toggle lever 21 are not completely linear, and are slightly inclined by the knicking amount β. Thereby, the mold thickness adjustment as an approximate position adjustment is completed.

  Here, the mold is closed with the crosshead 24 in the mold clamping completion position. However, when molding is performed by operating the injection molding machine, the crosshead 24 is moved from the mold clamping completion position to the crosshead mold. The mold closing is performed in a state where the mold is closed by the clamping process distance α. Therefore, it is necessary to finely adjust the position of the toggle support 15 so that the mold apparatus 11 ′ is closed with the cross head 24 in the mold closing position. Therefore, mold clamping force adjustment as fine position adjustment is performed.

  In this case, the mold thickness adjustment control device 41 calculates the number of rotations of the mold clamping motor 26 necessary for retracting the crosshead 24 by the crosshead mold clamping process distance α, and the mold clamping motor 26 is calculated by the number of rotations. Rotate. The crosshead mold clamping process distance α varies depending on the mold clamping force generated by the mold clamping device 10 and is calculated in advance based on a desired mold clamping force. Stored in storage means. As a result, the movable platen 13 moves backward by the platen mold clamping process distance as a movement amount corresponding to the crosshead mold clamping process distance α, and the mold mating surface of the movable mold 11b ′ and the mold of the fixed mold 11a ′. A gap corresponding to the platen mold clamping process distance is formed between the mating surfaces.

  Subsequently, the mold thickness adjustment control device 41 calculates the number of rotations of the mold thickness motor 31 necessary for retracting the toggle support 15 by the platen mold clamping process distance, and rotates the mold thickness motor 31 by the number of rotations. Let The platen mold clamping process distance is calculated in advance based on the crosshead mold clamping process distance α and is stored in advance in the storage means as the mold thickness target value 42. As a result, the toggle support 15 advances by the platen mold clamping process distance, so that the mold mating surface of the movable mold 11b ′ contacts the mold mating surface of the fixed mold 11a ′ as shown in FIG. Then, the mold is closed and the mold clamping force adjustment is completed.

  When the mold clamping force adjustment is completed, the replaced mold apparatus 11 ′ is appropriately attached to the mold clamping apparatus 10, and the mold apparatus replacement of the mold clamping apparatus 10 is completed. Thus, the injection molding machine can be operated to perform molding using the replaced mold apparatus 11 '.

  As described above, in the present embodiment, when the mold apparatus 11 ′ after replacement is attached in the mold apparatus replacement of the mold clamping apparatus 10, the mold thickness adjustment control apparatus 41 and the mold clamping force adjustment control apparatus 43 are toggled. The position of the support 15 is automatically adjusted to a position where a predetermined mold clamping force can be generated. Therefore, even when the mold apparatus 11 is replaced with one having a different thickness, the toggle mechanism 20 can be adjusted easily and in a short time so as to generate a predetermined mold clamping force.

  Further, since the encoder of the mold clamping motor 26 is used as the mold opening / closing position sensor 27 and the encoder of the mold thickness motor 31 is used as the mold clamping position sensor 32, the configuration of the automatic mold clamping force adjusting device for the molding machine is simplified. Cost can be lowered.

  In the present embodiment, when the mold thickness adjustment is completed, the toggle arm 22 and the first toggle lever 21 are not perfectly linear but are inclined by the knicking amount β. However, the toggle arm 22 and the first toggle lever 21 can be linear. In this case, in the mold clamping force adjustment, the distance by which the cross head 24 is moved backward is extended by the moving distance of the cross head 24 corresponding to the knicking amount β, and the distance by which the toggle support 15 is moved backward is the knicking amount. It is necessary to extend the moving distance of the movable platen 13 corresponding to β.

  Further, in the present embodiment, in the mold thickness adjustment, after the mold thickness adjustment control device 41 performs the operation of retracting the toggle support 15 by the necessary distance for mold clamping, the mold clamping force adjustment control device 43 moves the movable platen 13. An operation of advancing the distance required for the mold clamping is performed. However, the mold thickness adjustment control device 41 performs the operation of moving the toggle support 15 backward by the necessary mold clamping distance and the mold clamping force adjustment control device 43 performs the operation of moving the movable platen 13 forward by the necessary mold clamping distance almost simultaneously. It can also be. In this case, it is desirable that the operation of moving the toggle support 15 backward is performed slightly earlier than the operation of moving the movable platen 13 forward.

  Furthermore, when the mold clamping force adjustment is completed, the mold clamping motor 26 is driven to perform mold clamping, and it is possible to verify whether or not a desired mold clamping force is generated. When the desired mold clamping force is not generated, the mold clamping force adjustment can be immediately performed again.

  Next, a second embodiment of the present invention will be described. The description of the same structure and the same operation as those of the first embodiment will be omitted. Here, the operation in the case where the mold apparatus 11 '' after replacement is thinner than the mold apparatus 11 before replacement will be described.

  FIG. 11 is a first view showing the operation of exchanging the mold apparatus of the injection molding machine in the second embodiment of the present invention, and FIG. 12 is a mold of the injection molding machine in the second embodiment of the present invention. FIG. 13 is a third diagram showing the operation of exchanging the mold device of the injection molding machine in the second embodiment of the present invention, and FIG. 14 is a diagram showing the operation of exchanging the device. FIG. 15 shows the operation of exchanging the mold apparatus of the injection molding machine in the second embodiment, and FIG. 15 shows the operation of exchanging the mold apparatus of the injection molding machine in the second embodiment of the present invention. FIG.

  First, the operator operates the input means of the injection molding machine control device to operate the mold clamping device 10 to perform mold closing. In this case, the mold clamping motor 26 rotates by a predetermined number of rotations to advance the cross head 24 to a predetermined mold closing position. As a result, the movable platen 13 also moves forward to a predetermined mold closing position, so that the mold mating surface of the movable mold 11b comes into contact with the mold mating surface of the fixed mold 11a and the mold is closed.

  Subsequently, the operator manually attaches the coupling member 14 as shown in FIG. 11 to the side surface of the mold apparatus 11.

  Subsequently, the operator manually attaches a crane mounting bracket 47 as shown in FIG. 12 to the fixed mold 11a or the movable mold 11b, and attaches the crane mounting bracket 47 to a crane (not shown) such as an overhead traveling crane. The tip of a linear body 48 such as a wire rope or chain is engaged, and the weight of the mold apparatus 11 is supported by the crane.

  Subsequently, the operator manually releases the fixed mold 11 a and the movable mold 11 b from the fixed platen 12 and the movable platen 13. Then, the crane is operated, and as shown by an arrow J in FIG. 12, the mold apparatus 11 is lifted upward, taken out from the mold clamping apparatus 10, and moved to a predetermined place such as a mold place.

  Subsequently, the operator operates the crane, and replaces the die apparatus 11 ″ after the replacement with the crane mounting bracket 47 engaged with the tip of the linear body 48 as indicated by an arrow K in FIG. It is suspended from above and carried between the fixed platen 12 and the movable platen 13. It is assumed that the mold apparatus 11 ″ after replacement is thinner than the mold apparatus 11 before replacement.

  Subsequently, the operator operates the crane and manually adjusts the posture of the mold apparatus 11 ″ to match the axis of the fixed mold 11a ″ with the axis of the fixed platen 12. The operator manually engages the fixed mold 11a '' with the fixed platen 12.

  Subsequently, the operator operates the input means of the injection molding machine control device to activate the molding machine automatic mold clamping force adjustment device. First, the mold clamping force adjustment control device 43 is operated, and the mold clamping motor 26 is operated based on the detection signal of the mold opening / closing position sensor 27 so that the position of the crosshead 24 becomes the mold clamping completion position. In this case, the mold clamping force adjustment control device 43 moves the cross head 24 by a distance corresponding to the difference between the position of the cross head 24 detected based on the detection signal of the mold opening / closing position sensor 27 and the mold clamping completion position. The number of rotations of the mold clamping motor 26 necessary for this is calculated, and the mold clamping motor 26 is rotated by the number of rotations. Then, the movable platen 13 also moves forward by a distance corresponding to the moving distance of the cross head 24. As a result, the toggle arm 22 and the first toggle lever 21 are not completely linear and are slightly inclined by the knicking amount β. That is, the link angle θ is an angle corresponding to the state where the mold clamping of the mold apparatus 10 is completed.

  In this case, since the mold apparatus 11 ″ after replacement is thinner than the mold apparatus 11 before replacement, as shown in FIG. 14, the mold apparatus 11 ″ is located between the movable mold 11b ″ and the movable platen 13. There is a gap in the gap. Therefore, the mold thickness adjustment control device 41 retreats the toggle support 15 by a distance corresponding to the difference in thickness between the mold apparatus 11 ″ after replacement and the mold apparatus 11 before replacement. Rotate. Since a load is applied to the mold thickness motor 31 at a position where the mold mounting surface of the movable platen 13 is in contact with the back surface of the movable mold 11b ″, this is detected and the rotation of the mold thickness motor 31 is stopped, and the movable The platen 13 is stopped.

  Subsequently, the operator manually engages the movable mold 11b '' with the movable platen 13. Then, the operator manually removes the distal end portion of the linear body 48 from the crane mounting bracket 47, removes the crane mounting bracket 47 from the fixed mold 11a ″ or the movable mold 11b ″, and connects the coupling member 14 ′. Remove 'from the mold apparatus 11' '. Thereby, mold thickness adjustment is completed.

  Subsequently, mold clamping force adjustment as fine position adjustment is performed. In this case, the mold thickness adjustment control device 41 calculates the number of rotations of the mold clamping motor 26 necessary for retracting the crosshead 24 by the crosshead mold clamping process distance α, and the mold clamping motor 26 is calculated by the number of rotations. Rotate. The crosshead mold clamping process distance α varies depending on the mold clamping force generated by the mold clamping device 10 and is calculated in advance based on a desired mold clamping force. Stored in storage means. As a result, the movable platen 13 moves backward by the platen mold clamping process distance as a movement amount corresponding to the crosshead mold clamping process distance α, and the mold mating surface of the movable mold 11b ″ and the fixed mold 11a ″ are moved. A gap corresponding to the platen mold clamping process distance is formed between the mold mating surfaces.

  Subsequently, the mold thickness adjustment control device 41 calculates the number of rotations of the mold thickness motor 31 necessary for retracting the toggle support 15 by the platen mold clamping process distance, and rotates the mold thickness motor 31 by the number of rotations. Let The platen mold clamping process distance is calculated in advance based on the crosshead mold clamping process distance α and is stored in advance in the storage means as the mold thickness target value 42. As a result, the toggle support 15 moves forward by the platen mold clamping process distance, so that the mold mating surface of the movable mold 11b ″ is the mold mating surface of the fixed mold 11a ″ as shown in FIG. The mold is closed by touching to complete the mold clamping force adjustment.

  When the adjustment of the mold clamping force is completed, the replaced mold apparatus 11 ″ is appropriately attached to the mold clamping apparatus 10, and the mold apparatus replacement of the mold clamping apparatus 10 is completed. Thereby, the injection molding machine can be operated to perform molding using the replaced mold apparatus 11 ″.

  As described above, in the present embodiment, in the replacement of the mold apparatus of the mold clamping apparatus 10, even if the mold apparatus 11 '' after replacement is thinner than the mold apparatus 11 before replacement. When the mold apparatus 11 ″ after replacement is attached, the mold thickness adjustment control apparatus 41 and the mold clamping force adjustment control apparatus 43 are brought into positions where the toggle support 15 can generate a predetermined mold clamping force. To adjust automatically. Therefore, even when the mold apparatus 11 is replaced with one having a different thickness, the toggle mechanism 20 can be adjusted easily and in a short time so as to generate a predetermined mold clamping force.

  In the present embodiment, when the mold thickness adjustment is completed, the toggle arm 22 and the first toggle lever 21 are not perfectly linear but are inclined by the knicking amount β. However, the toggle arm 22 and the first toggle lever 21 can be linear. In this case, in the mold clamping force adjustment, the distance by which the cross head 24 is moved backward is extended by the moving distance of the cross head 24 corresponding to the knicking amount β, and the distance by which the toggle support 15 is moved backward is the knicking amount. It is necessary to extend the moving distance of the movable platen 13 corresponding to β.

  Furthermore, when the mold clamping force adjustment is completed, the mold clamping motor 26 is driven to perform mold clamping, and it is possible to verify whether or not a desired mold clamping force is generated. When the desired mold clamping force is not generated, the mold clamping force adjustment can be immediately performed again.

  Next, a third embodiment of the present invention will be described. The description of the same structure and the same operation as those of the first and second embodiments will be omitted. Here, a description will be given of an operation in which the mold apparatus 11 ′ ″ after replacement is thicker than the mold apparatus 11 before replacement, and the mold clamping force adjustment is also performed in the mold thickness adjustment.

  FIG. 16 is a first view showing the operation of exchanging the mold apparatus of the injection molding machine in the third embodiment of the present invention, and FIG. 17 is the mold of the injection molding machine in the third embodiment of the present invention. FIG. 18 is a third diagram showing the operation of exchanging the mold device of the injection molding machine according to the third embodiment of the present invention. FIG. 19 is a diagram showing the operation of exchanging the device. FIG. 20 shows the operation of exchanging the mold apparatus of the injection molding machine in the third embodiment, and FIG. 20 shows the operation of exchanging the mold apparatus of the injection molding machine in the third embodiment of the present invention. FIG. 5 and FIG. 21 are sixth views showing the operation of exchanging the mold apparatus of the injection molding machine according to the third embodiment of the present invention.

  First, the operator operates the input means of the injection molding machine control device to operate the mold clamping device 10 to perform mold closing. In this case, the mold clamping motor 26 rotates by a predetermined number of rotations to advance the cross head 24 to a predetermined mold closing position. As a result, the movable platen 13 also moves forward to a predetermined mold closing position, so that the mold mating surface of the movable mold 11b comes into contact with the mold mating surface of the fixed mold 11a and the mold is closed.

  Subsequently, the operator manually attaches the coupling member 14 as shown in FIG. 16 to the side surface of the mold apparatus 11.

  Subsequently, the operator manually attaches a crane mounting bracket 47 as shown in FIG. 17 to the fixed mold 11a or the movable mold 11b, and attaches the crane mounting bracket 47 to a crane (not shown) such as an overhead traveling crane. The tip of a linear body 48 such as a wire rope or chain is engaged, and the weight of the mold apparatus 11 is supported by the crane.

  Subsequently, the operator manually releases the fixed mold 11 a and the movable mold 11 b from the fixed platen 12 and the movable platen 13. Then, the crane is operated, and as shown by an arrow J in FIG. 17, the mold apparatus 11 is lifted upward, taken out from the mold clamping apparatus 10, and moved to a predetermined place such as a mold place.

  Subsequently, the operator operates the crane so that the mold apparatus 11 ′ ″ after replacement in which the tip of the linear body 48 is engaged with the crane mounting bracket 47 is indicated by an arrow K in FIG. It is suspended from above and carried between the fixed platen 12 and the movable platen 13. It is assumed that the mold apparatus 11 ′ ″ after replacement is thicker than the mold apparatus 11 before replacement.

  Subsequently, the operator operates the crane and manually adjusts the posture of the mold apparatus 11 ′ ″ to match the axis of the fixed mold 11a ′ ″ with the axis of the fixed platen 12. Let The operator manually engages the fixed mold 11a ′ ″ with the fixed platen 12.

  Subsequently, the operator operates the input means of the injection molding machine control device to operate the mold clamping device 10 and advance the movable platen 13. Then, the movable platen 13 is stopped at a position where the mold mounting surface of the movable platen 13 is in contact with the back surface of the movable mold 11b ′ ″. In this position, the movable platen 13 in the mold apparatus 11 ′ ″ after the replacement is also in the mold closed position. In this case, since the mold apparatus 11 ′ ″ after replacement is thicker than the mold apparatus 11 before replacement, the toggle arm 22 and the first toggle lever 21 are connected to each other as shown in FIG. It is greatly inclined. That is, the link angle θ is larger than that shown in FIG.

  Subsequently, the operator manually engages the movable mold 11b ′ ″ with the movable platen 13. Then, the operator manually removes the distal end portion of the linear body 48 from the crane mounting bracket 47, removes the crane mounting bracket 47 from the fixed mold 11a ′ ″ or the movable mold 11b ′ ″, and connects the coupling member. Remove 14 ″ ′ from mold apparatus 11 ′ ″.

  Subsequently, the operator operates the input means of the injection molding machine control device to activate the molding machine automatic mold clamping force adjustment device. In this case, the mold clamping force is also adjusted in the mold thickness adjustment. First, the mold thickness adjustment control device 41 is operated to detect the position of the crosshead 24 based on the detection signal of the mold opening / closing position sensor 27. In this case, since the toggle arm 22 and the first toggle lever 21 are greatly inclined at the nodes and the link angle θ is large, the crosshead 24 is closed as can be seen from the curve E shown in FIG. It is in a position retracted from the position. Therefore, the mold thickness adjustment control device 41 operates the mold thickness motor 31 to move the toggle support 15 backward so that the cross head 24 can be moved to the mold closing position.

  In this case, the mold thickness adjustment control device 41 determines the difference between the position of the movable platen 13 detected based on the detection signal of the mold opening / closing position sensor 27 and the position of the movable platen 13 corresponding to the mold closed position of the crosshead 24. The number of rotations of the mold thickness motor 31 required to move the toggle support 15 backward is calculated by the distance required for closing the mold as the corresponding distance. At this time, the mold clamping force adjustment control device 43 is also operated, and as can be seen from the curve H shown in FIG. 4, the rotational speed of the mold thickness motor 31 is calculated in consideration of the mold clamping completion position. The thickness motor 31 is rotated. As a result, the toggle support 15 moves backward by the necessary distance to close the mold, so that the mold mating surface of the movable mold 11b ′ ″ is aligned with the mold of the fixed mold 11a ′ ″ as shown in FIG. A gap corresponding to the necessary distance for mold closing is generated between the mold mating surface of the movable mold 11b ′ ″ and the mold mating surface of the fixed mold 11a ′ ″.

  Subsequently, the mold clamping force adjustment control device 43 rotates the mold clamping motor 26, and as shown in FIG. 21, the mold mating surface of the movable mold 11b ′ ″ and the fixed mold 11a ′ ″. Rotate until the mold mating surface contacts. Thereby, mold thickness adjustment and mold clamping force adjustment are completed.

Then, after the replacement, the mold apparatus 11 ′ ″ is properly attached to the mold clamping apparatus 10, and the mold replacement of the mold clamping apparatus 10 is completed. As a result, the injection molding machine can be operated to perform molding using the replaced mold apparatus 11 ′ ″.

  Thus, in the present embodiment, the mold clamping force adjustment is also performed in the mold thickness adjustment by the mold thickness adjustment control device 41 and the mold clamping force adjustment control device 43. For this reason, the mold clamping device 10 can be adjusted to generate a predetermined mold clamping force in a shorter time.

  Next, a fourth embodiment of the present invention will be described. The description of the same structure and the same operation as those in the first to third embodiments will be omitted. Here, a description will be given of an operation in which the mold apparatus 11 ″ after the replacement is thinner than the mold apparatus 11 before the replacement and the mold clamping force is adjusted in the mold thickness adjustment. The description will be made with reference to FIGS. 11 to 15 in the second embodiment.

  First, the operator operates the input means of the injection molding machine control device to operate the mold clamping device 10 to perform mold closing. In this case, the mold clamping motor 26 rotates by a predetermined number of rotations to advance the cross head 24 to a predetermined mold closing position. As a result, the movable platen 13 also moves forward to a predetermined mold closing position, so that the mold mating surface of the movable mold 11b comes into contact with the mold mating surface of the fixed mold 11a and the mold is closed.

  Subsequently, the operator manually attaches the coupling member 14 as shown in FIG. 11 to the side surface of the mold apparatus 11.

  Subsequently, the operator manually attaches a crane mounting bracket 47 as shown in FIG. 11 to the fixed mold 11a or the movable mold 11b, and attaches the crane mounting bracket 47 to a crane (not shown) such as an overhead traveling crane. The tip of a linear body 48 such as a wire rope or chain is engaged, and the weight of the mold apparatus 11 is supported by the crane.

  Subsequently, the operator manually releases the fixed mold 11 a and the movable mold 11 b from the fixed platen 12 and the movable platen 13. Then, the crane is operated, and as shown by an arrow J in FIG. 12, the mold apparatus 11 is lifted upward, taken out from the mold clamping apparatus 10, and moved to a predetermined place such as a mold place.

  Subsequently, the operator operates the crane, and replaces the die apparatus 11 ″ after the replacement with the crane mounting bracket 47 engaged with the tip of the linear body 48 as indicated by an arrow K in FIG. It is suspended from above and carried between the fixed platen 12 and the movable platen 13. It is assumed that the mold apparatus 11 ″ after replacement is thinner than the mold apparatus 11 before replacement.

  Subsequently, the operator operates the crane and manually adjusts the posture of the mold apparatus 11 ″ to match the axis of the fixed mold 11a ″ with the axis of the fixed platen 12. The operator manually engages the fixed mold 11a '' with the fixed platen 12.

  Subsequently, the operator operates the input means of the injection molding machine control device to activate the molding machine automatic mold clamping force adjustment device. First, the mold clamping force adjustment control device 43 is activated, and the mold H is set so that the position of the crosshead 24 becomes the mold clamping completion position based on the detection signal of the mold opening / closing position sensor 27 in consideration of the curve H shown in FIG. The fastening motor 26 is operated. In this case, the mold clamping force adjustment control device 43 moves the cross head 24 by a distance corresponding to the difference between the position of the cross head 24 detected based on the detection signal of the mold opening / closing position sensor 27 and the mold closing position. The number of rotations of the mold clamping motor 26 necessary for the calculation is calculated, and the mold clamping motor 26 is rotated by the number of rotations. Then, the movable platen 13 also moves forward by a distance corresponding to the moving distance of the cross head 24. As a result, the toggle arm 22 and the first toggle lever 21 are not completely linear and are slightly inclined. That is, the link angle θ is an angle corresponding to the state where the mold apparatus 10 is closed.

  In this case, since the mold apparatus 11 ″ after replacement is thinner than the mold apparatus 11 before replacement, as shown in FIG. 14, the mold apparatus 11 ″ is located between the movable mold 11b ″ and the movable platen 13. There is a gap. Therefore, the mold thickness adjustment control device 41 rotates the mold thickness motor 31 until the mold mounting surface of the movable platen 13 contacts the back surface of the movable mold 11b ″.

  Subsequently, the operator manually engages the movable mold 11b '' with the movable platen 13. Then, the operator manually removes the distal end portion of the linear body 48 from the crane mounting bracket 47, removes the crane mounting bracket 47 from the fixed mold 11a ″ or the movable mold 11b ″, and connects the coupling member 14 ′. Remove 'from the mold apparatus 11' '. Thereby, mold thickness adjustment and mold clamping force adjustment are completed.

  Then, the mold apparatus 11 ″ after the replacement is properly attached to the mold clamping apparatus 10, and the mold replacement of the mold clamping apparatus 10 is completed. Thereby, the injection molding machine can be operated to perform molding using the replaced mold apparatus 11 ″.

  Thus, in the present embodiment, even if the mold apparatus 11 ″ after replacement is thinner than the mold apparatus 11 before replacement, the mold thickness adjustment control device 41 and the mold clamping force are used. The adjustment control device 43 also performs mold clamping force adjustment in mold thickness adjustment. For this reason, the mold clamping device 10 can be adjusted to generate a predetermined mold clamping force in a shorter time.

  In the above embodiment, the horizontal type injection molding machine in which the movable platen moves in the horizontal direction (horizontal direction) has been described. However, in the automatic mold clamping force adjusting device for a molding machine according to the present invention, the movable platen has a vertical length. The present invention can also be applied to a vertical injection molding machine that moves in the direction (vertical direction). Moreover, the automatic mold clamping force adjusting device for a molding machine of the present invention can be applied to a molding machine such as a die-cast machine and an IJ sealing press in addition to an injection molding machine.

The present invention is not limited to the above-described embodiment, and various modifications can be made based on the spirit of the present invention, and they are not excluded from the scope of the present invention.

It is the schematic of the mold clamping apparatus of the injection molding machine in the 1st Embodiment of this invention. It is a principal part enlarged view of the toggle mechanism in the 1st Embodiment of this invention. It is a figure which shows the relationship between the position of the crosshead of a toggle mechanism, and a link angle in the 1st Embodiment of this invention. It is a figure which shows the relationship between the position of the crosshead of the toggle mechanism in the 1st Embodiment of this invention, and mold clamping force. It is a figure which shows the structure of the automatic mold clamping force adjustment apparatus for molding machines in the 1st Embodiment of this invention. It is a 1st figure which shows the operation | movement which replaces | exchanges the metal mold apparatus of the injection molding machine in the 1st Embodiment of this invention. It is a 2nd figure which shows the operation | movement which replaces | exchanges the die apparatus of the injection molding machine in the 1st Embodiment of this invention. It is a 3rd figure which shows the operation | movement which replaces | exchanges the metal mold apparatus of the injection molding machine in the 1st Embodiment of this invention. It is a 4th figure which shows the operation | movement which replaces | exchanges the metal mold apparatus of the injection molding machine in the 1st Embodiment of this invention. It is a 5th figure which shows the operation | movement which replaces | exchanges the metal mold | die apparatus of the injection molding machine in the 1st Embodiment of this invention. It is a 1st figure which shows the operation | movement which replaces | exchanges the metal mold | die apparatus of the injection molding machine in the 2nd Embodiment of this invention. It is a 2nd figure which shows the operation | movement which replaces | exchanges the metal mold | die apparatus of the injection molding machine in the 2nd Embodiment of this invention. It is a 3rd figure which shows the operation | movement which replaces | exchanges the metal mold apparatus of the injection molding machine in the 2nd Embodiment of this invention. It is a 4th figure which shows the operation | movement which replaces | exchanges the die apparatus of the injection molding machine in the 2nd Embodiment of this invention. It is a 5th figure which shows the operation | movement which replaces | exchanges the die apparatus of the injection molding machine in the 2nd Embodiment of this invention. It is a 1st figure which shows the operation | movement which replaces | exchanges the die apparatus of the injection molding machine in the 3rd Embodiment of this invention. It is a 2nd figure which shows the operation | movement which replaces | exchanges the metal mold | die apparatus of the injection molding machine in the 3rd Embodiment of this invention. It is a 3rd figure which shows the operation | movement which replaces | exchanges the metal mold apparatus of the injection molding machine in the 3rd Embodiment of this invention. It is a 4th figure which shows the operation | movement which replaces | exchanges the metal mold apparatus of the injection molding machine in the 3rd Embodiment of this invention. It is a 5th figure which shows the operation | movement which replaces | exchanges the metal mold apparatus of the injection molding machine in the 3rd Embodiment of this invention. It is a 6th figure which shows the operation | movement which replaces | exchanges the metal mold apparatus of the injection molding machine in the 3rd Embodiment of this invention.

11, 11 ′, 11 ″, 11 ′ ″ Mold device 12 Fixed platen 13 Movable platen 15 Toggle support 16 Tie bar 20 Toggle mechanism 26 Mold clamping motor 27 Mold opening / closing position sensor 31 Mold thickness motor 32 Mold clamping position sensor 41 Mold Thickness adjustment control device 43 Mold clamping force adjustment control device

Claims (2)

Toggle mold clamping device support along the tie bar when a mold device of different thickness is exchanged between the fixed mold support device and the movable mold support device arranged opposite to the fixed mold support device In the mold thickness adjusting method for moving the device,
(A) calculating the position of the movable platen based on the detection signal of the mold opening / closing position sensor when the mold apparatus is attached;
(B) obtaining a required clamping distance corresponding to a difference between the calculated movable platen position and a movable platen position corresponding to the clamping completion position of the crosshead;
(C) A mold thickness adjusting method characterized by moving the toggle type mold clamping device support device by the required distance for mold clamping. (A) After the toggle type mold clamping device support device is moved, the cross head is retracted by a cross head mold clamping process distance, and the movable platen is retracted by a platen mold clamping process distance corresponding to the cross head mold clamping process distance. Let
(B) The mold thickness adjusting method according to claim 1, wherein the toggle type mold clamping device supporting device is advanced by the platen mold clamping process distance.

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