JP2012250246A - Mold making die, and set-up change method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a worker to easily perform set-up change work of a mold making die or the like.SOLUTION: In this mold making die, each of an upper die 1 and a lower die 2 includes a plurality of divided dies formed to be dividable from one another in the horizontal direction. The mold making die includes: upper die and lower die clamp devices for clamping the divided dies to respectively integrate the plurality of divided dies of each of the upper die 1 and the lower die 2 with one another; a first ejector plate 48 arranged on the lower side of the lower die 2 and having ejector pins 47 erected thereon; a second ejector plate 49 formed to be pressed to the upper side by an extrusion rod structured to be movable forward/backward in the vertical direction and having return pins 52 erected thereon; and an ejector plate attaching/detaching device 61 for detachably attaching the first ejector plate 48 to the second ejector plate 49.

Description

  The present invention includes an upper mold and a lower mold, and a mold making in which a cavity filled with casting sand is formed between the upper mold and the lower mold in a state where the upper mold and the lower mold are aligned with each other on the mating surfaces. The present invention belongs to the technical field related to molds and mold changing methods.

  Generally, a mold making mold for forming a casting mold such as a sand core is provided with an upper mold and a lower mold, and the upper mold and the lower mold are aligned with each other in a state where the upper mold and the lower mold are aligned. A cavity filled with casting sand is formed between both molds, and a mold is formed in this cavity. Further, an insertion hole extending in the vertical direction is formed in the bottom wall portion of the cavity forming recess provided in the lower mold, and an ejector pin for extruding a mold formed by the cavity is formed in the insertion hole. It is inserted from the lower side of the lower mold so as to be able to advance and retreat with respect to the cavity forming recess (for example, see Patent Document 1).

  In such a mold making mold, the molding sand is vigorously flowing from the inlet of the upper mold into the cavity, so that the molding surface is heavily worn, and therefore it is necessary to frequently correct the mold. Thus, the operator frequently checks the wear state of the molding surface of the mold making mold, and if it is confirmed that there is more than a predetermined wear, both the upper and lower molds, the ejector are used to correct the mold. The ejector plate on which the pins and the ejector pins are erected is lifted by a hoist or the like as a set, and is removed from the support member that supports them, and is conveyed to a predetermined position. In addition, when performing a changeover operation of a mold making die to make another mold, the same operation as the attaching / detaching operation for correcting the die is performed.

  In the above work, if the hoist position is deviated from the mold installation position at the time of attaching / detaching to the support member such as the upper and lower molds, the operator can carry the hoist wire or the mold and move the position and inclination. The current situation is adjusting.

  Therefore, in Patent Document 1, it is known that the mold making mold is made of a light alloy in order to reduce the weight of the mold making mold and facilitate the changeover work.

JP 2008-23580 A

  However, even if the mold making mold is made of light alloy, if the entire mold including the ejector pins and the ejector plate is large and heavy, it is necessary to lift them up with a hoist or the like. When the position deviates from the installation position, it is necessary for the operator to adjust the position and inclination of the hoist wire or the mold by force.

  The present invention has been made in view of such a point, and an object of the present invention is to enable an operator to easily perform a change-over operation of a mold making mold or an attachment / detachment operation for mold correction. It is in.

  In order to achieve the above object, the present invention includes an upper mold and a lower mold, and the sand mold is filled between the molds in a state where the upper mold and the lower mold are aligned with each other. Each of the upper mold and the lower mold is composed of a plurality of divided molds that can be divided in the horizontal direction with respect to the mold making mold in which the cavity is formed, and each of the upper mold and the lower mold An upper mold and a lower mold clamping device for clamping the divided molds so as to integrate each of the divided molds, and an insertion formed so as to extend vertically in the bottom wall portion of the cavity for forming the cavity of the lower mold An ejector pin that is inserted through the hole from the lower side of the lower mold so as to be able to advance and retreat with respect to the cavity forming recess, and a guide member that is movable in the vertical direction by a guide member provided on the side of the lower mold. When the upper mold and the lower mold are combined, A return pin that is pressed downward by the upper die, a first ejector plate that is provided on the lower side of the lower die, and on which the ejector pin is erected, and a push rod that is configured to be movable back and forth in the vertical direction. A second ejector plate configured to be pressed and provided with the return pin upright; and an ejector plate attaching / detaching device for detachably attaching the first ejector plate to the second ejector plate. It was.

  With the above configuration, each of the upper mold and the lower mold includes a plurality of divided molds, so that the weight of each divided mold can be reduced and the size can be reduced. As a result, the operator can easily move each of the divided molds in a state in which the clamp is released without using a hoist or the like. In addition, the first ejector plate on which the ejector pins are erected is removed from the second ejector plate by the ejector plate attaching / detaching device that detachably attaches the first ejector plate to the second ejector plate when the mold making mold is changed. Thereafter, by attaching a new first ejector plate on which a new ejector pin is erected to the second ejector plate, the ejector pin can be easily replaced with one corresponding to a new lower mold. Therefore, the mold making mold can be easily replaced and attached / removed for mold correction.

  In the mold making mold, the upper mold and the lower mold clamp device each have a clamp member that can move in the horizontal direction, and the clamp members of the upper mold and the lower mold clamp device are the upper mold and the lower mold, respectively. It is preferable that it is comprised so that the division | segmentation type | mold side part of this may be clamped.

  This makes it possible to easily integrate a plurality of split molds that are split in the horizontal direction.

  In the mold making die, the ejector plate attaching / detaching device is configured such that the ejector plate attaching / detaching device passes through an opening formed in the second ejector plate provided below the first ejector plate from the lower surface of the first ejector plate. 2 Extends to the lower side of the ejector plate and slides along the lower surface of the second ejector plate to the lower surface of the second ejector plate, with a substantially L-shaped locking member whose tip is bent in the horizontal direction. A detachable member provided on the lock member, wherein the detachable member has an engaging portion that is located above the distal end portion of the lock member and is engageable with the distal end portion. Between the engagement position where the engagement portion engages with the distal end portion of the lock member by sliding and the engagement release position where the engagement portion is retracted from the upper side of the distal end portion of the lock member to release the engagement. Are movable in, it is preferable.

  Thus, by sliding the detachable member, the engaging portion can be easily moved to the engaging position or moved to the disengaging position. And if an engaging part is moved to an engaging position, a 1st ejector plate will be attached to a 2nd ejector plate because an engaging part engages with the front-end | tip part of a lock member. On the other hand, if the engaging portion is moved to the non-engaging position, the first ejector plate can be detached from the second ejector plate by retracting the engaging portion from the upper side of the distal end portion of the lock member. Therefore, attachment and removal of the first ejector plate from the second ejector plate can be easily performed.

  In the mold making mold, each of the upper mold and the lower mold is divided into a fixed split mold and a movable split mold, and the upper clamp device is configured to convert the upper movable split mold into the upper mold. The lower mold clamping device includes a lower mold that presses the movable movable mold of the lower mold toward the fixed divided mold side of the lower mold. It preferably includes a movable split type clamping device.

  In this way, the upper mold movable split mold clamping device allows the upper fixed split mold and the movable split mold to be brought into close contact with each other at the split mating surface, and the lower mold movable split mold clamping device. The fixed split mold and the movable split mold of the mold can be brought into close contact with each other at the split mating surfaces. Therefore, the upper mold (lower mold) movable split mold can be accurately positioned with respect to the upper mold (lower mold) fixed split mold.

  In the mold making die, it is preferable that the upper mold, the lower mold, and the first ejector plate are made of duralumin.

  This makes each divided mold of the upper mold, each divided mold of the lower mold, and the first ejector plate as light as possible, and makes it easier to change the mold making mold and attach / detach the mold for correcting the mold. Can be done.

  Another aspect of the present invention includes an upper mold and a lower mold, and a cavity filled with casting sand is formed between the upper mold and the lower mold when the upper mold and the lower mold are aligned with each other on the mating surfaces. In this invention, each of the upper mold and the lower mold is composed of a plurality of divided molds configured to be separable in the horizontal direction. An upper mold and a lower mold clamping device for clamping the divided molds so that the plurality of divided molds of each of the lower molds are integrated with each other, and extending vertically to the bottom wall portion of the cavity for forming the cavity of the lower mold An ejector pin that is inserted into the formed insertion hole so as to be able to advance and retreat from the lower side of the lower mold to the cavity forming recess, and a guide member that is provided on the side of the lower mold, and is movable in the vertical direction. When the upper mold and the lower mold are combined, A return pin that is pressed downward by the upper die, a first ejector plate that is provided on the lower side of the lower die and on which the ejector pin is erected, and an extrusion rod configured to be able to advance and retract in the vertical direction. And a second ejector plate on which the return pin is erected, and an ejector plate attaching / detaching device for detachably attaching the first ejector plate to the second ejector plate, The lower die and the guide member are provided on the upper surface of the lower die support member, and the upper die is divided by the upper die clamping device in a state where the upper die and the lower die are aligned with each other on the mating surface. A step of releasing the clamp of the mold, a step of removing all the divided molds of the upper mold from which the clamp has been released from the lower mold, and after removing the upper mold from the lower mold, By the step of releasing the clamp of the lower mold by the lower mold clamping device, the step of removing the entire lower mold of the lower mold released from the clamp from the upper surface of the lower mold support member, and the ejector plate attaching / detaching device, A step of removing the first ejector plate from the second ejector plate in a state where the first ejector plate on which the ejector pin is erected is removed from the second ejector plate; and the first ejector plate being removed. A step of attaching a new first ejector plate, on which a new ejector pin is erected, to the second ejector plate by the ejector plate attaching / detaching device, and an upper surface of the lower die support member from which the lower die is removed, The new ejector pin is inserted into the lower mold through-hole of the entire lower mold. A step of placing the whole upper divided mold on the new lower mold so that the mating surfaces of the two molds are aligned with each other, and the lower mold supporting device by the lower mold clamping device. After the process of integrating the new lower mold split molds on the upper surface and the integration of the new lower mold split molds, the upper clamp device is used to form a new upper mold on the new lower mold. And integrating the split molds.

  That is, in order to change the mold-making mold, first, with the upper mold and the lower mold aligned on each other's mating surface, the upper mold split mold clamp by the upper mold clamping device is released, Remove the upper mold from the lower mold after releasing the clamp. At this time, each divided mold of the upper mold is small and light, so that the operator can easily remove it from the lower mold by holding each divided mold in his / her hand.

  Subsequently, the lower mold divided mold clamped by the lower mold clamping device is released, and the lower mold all divided molds released from the clamp are removed from the upper surface of the lower mold supporting member. At this time, the ejector pin comes out of the lower mold insertion hole. Since each of the divided molds of the lower mold is small and light, the operator can easily remove the divided mold from the upper surface of the lower mold support member by holding each divided mold in his / her hand.

  Next, the ejector plate attaching / detaching device causes the first ejector plate on which the ejector pins are erected to be detached from the second ejector plate, and removes the first ejector plate from the second ejector plate, and then the second ejector plate. A new first ejector plate on which a new ejector pin is erected is attached to the plate by the ejector plate attaching / detaching device. The weight of the first ejector plate including the ejector pins can be made lighter than the weight of the second ejector plate, and the replacement of the first ejector plate can be easily performed.

  Subsequently, a new lower mold full divided mold is placed on the upper surface of the lower mold support member from which the lower mold has been removed. At this time, the new ejector pin is inserted into the insertion hole of the lower mold. Then, a new upper mold all-divided mold is placed on the new lower mold. As described above, the divided molds of the upper mold and the lower mold are small and light, and these operations can be easily performed.

  Next, the lower mold clamping device clamps the new lower mold split molds on the upper surface of the lower mold support member, and then the upper mold clamp apparatus creates a new upper mold on the new lower mold. Clamp the split molds.

  As described above, when the mold making mold is changed, the operator does not need to lift the divided molds of the upper mold and the lower mold using a hoist or the like, and easily moves each divided mold in the hand. Therefore, it is possible to easily change the mold.

  As described above, according to the present invention, the operator can easily move the upper and lower divided molds and the first ejector plate by holding them without using a hoist or the like. As a result, it becomes possible to easily perform a changeover operation of the mold making mold or an attaching / detaching operation for correcting the mold, thereby improving workability.

1 is a side view schematically showing a mold making die according to an embodiment of the present invention. FIG. 2 is a view in the direction of arrows II in FIG. 1. FIG. 3 is a view in the direction of arrow III in FIG. 1. FIG. 3 is a view corresponding to FIG. 2 showing a state in which the lower mold is removed from the upper surface of the lower mold support plate. FIG. 4 is a view corresponding to FIG. 3 showing a state in which the upper mold is removed from the lower surface of the upper mold support plate. It is the VI-VI sectional view taken on the line of FIG. It is the VII-VII sectional view taken on the line of FIG. It is the perspective view seen from the lower side which shows the lower side of a 2nd ejector plate, (a) shows the state which has an attachment / detachment member in an engagement position, (b) shows an attachment / detachment member in an engagement release position. Indicates a certain state. It is the schematic for demonstrating the setup change procedure of a mold making metal mold | die.

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

  1 to 3 show a mold making die according to an embodiment of the present invention. This mold making mold is provided in a mold making apparatus for making a casting mold such as a sand core. This mold-making mold includes an upper mold 1 and a lower mold 2 made of duralumin that are quadrangular in plan view, and the upper mold 1 and the lower mold 2 are joined to each other (the lower surface and lower surface of the upper mold 1). A cavity filled with casting sand is formed between the two molds 1 and 2 in a state of being combined on the upper surface of the mold 2. In this cavity, a mold is formed. In addition, in FIGS. 1-3, the mold making metal mold | die is shown schematically and drawn in a simplified manner.

  The upper mold 1 includes first and second divided molds 1a and 1b configured to be splittable in the horizontal direction (X direction shown in FIGS. 1 to 5), and the lower mold 2 is also connected to the horizontal direction ( The first and second split molds 2a and 2b are configured to be splittable in the (X direction). The first divided mold 1a of the upper mold 1 and the first divided mold 2a of the lower mold 2 are combined with each other, and the second divided mold 1b of the upper mold 1 and the second divided mold 2b of the lower mold 2 are combined with each other. The dividing surfaces of the first divided molds 1a and 2a and the second divided molds 1b and 2b in each of the upper mold 1 and the lower mold 2 are in the Y direction perpendicular to the dividing direction (X direction) (see FIGS. 2 to 5). And extends in the vertical direction. A cavity forming recess 1c is formed in each of the first and second split molds 1a and 1b of the upper mold 1, and a cavity forming recess 2c is also formed in the first and second split molds 2a and 2b of the lower mold 2. Each is formed. When the upper mold 1 and the lower mold 2 are brought together on the mating surfaces, two cavities are formed by the cavity forming recess 1c of the upper mold 1 and the cavity forming recess 2c of the lower mold 2. . In the present embodiment, two cavities are formed as a whole of the mold making mold, but three or more cavities may be formed, or one cavity may be formed. The cavity may be formed across the first and second split molds 1a and 1b of the upper mold 1 (the first and second split molds 2a and 2b of the lower mold 2).

  The upper mold 1 (first and second divided molds 1a and 1b) is provided on the lower surface of the upper mold support plate 5 (see FIG. 5), and the lower mold 2 (first and second divided molds 2a and 2b) is It is provided on the upper surface of the lower mold support plate 6 (see FIG. 4). The upper mold support plate 5 is fixed to a recessed portion on the lower surface of the movable platen 7 of the mold making apparatus, and the lower mold support plate 6 is fixed to a recessed section on the upper surface of the stationary platen 8 of the mold making apparatus. It corresponds to a lower mold support member that supports the lower mold 2. The movable platen 7 and the fixed platen 8 are arranged to face each other in the vertical direction, and the upper mold support plate 5 and the lower mold support plate 6 are also arranged to face each other in the vertical direction. The movable platen 7 (upper mold support plate 5) is configured to be movable in the vertical direction with respect to the fixed platen 8 (lower mold support plate 6) by a mold clamping device (not shown). (In FIG. 1, the movable platen 7 and the upper mold support plate 5 are positioned at the mold opening position). In FIG. 1, the upper mold support plate 5 and the lower mold support plate 6 are not visible. The upper mold support plate 5 and the lower mold support plate 6 are not necessarily required, and the upper mold 1 may be directly supported by the movable platen 7 and the lower mold 2 may be directly supported by the fixed platen 8. In this case, the fixed platen 8 serves as a lower mold support member that supports the lower mold 2.

  As shown in FIG. 4, the lower mold support plate 6 is formed with a through hole 6 a penetrating in the thickness direction (vertical direction) of the lower mold support plate 6. To fourth positioning keys 11 to 14 are provided. The first to third positioning keys 11 to 13 are for positioning the lower mold 2 with respect to the lower mold support plate 6 of the first divided mold 2a, and the fourth positioning key 14 is the second divided mold of the lower mold 2 It is for positioning with respect to the lower mold support plate 6 of 2b. A through hole similar to the through hole 6 a is formed at a position corresponding to the through hole 6 a in the fixed platen 8.

  The first split mold 2a of the lower mold 2 is positioned in the X direction and the Y direction perpendicular to each other by the first to third positioning keys 11 to 13, but the second split mold 2b of the lower mold 2 is The fourth positioning key 14 is positioned only in the Y direction, and is movable in the X direction on the upper surface of the lower mold support plate 6. The positioning of the second split mold 2b in the X direction is performed by pressing the second split mold 2b toward the first split mold 2a by a fifth lower mold clamp device 20 described later, and the first and second split molds 2a, 2a, 2b is performed by bringing the divided and mating surfaces of 2b into close contact with each other.

  As shown in FIGS. 2 and 4, on the upper surface of the fixed platen 8, the first and second split molds 2a, 2a, 2b, so as to integrate the first and second split molds 2a, 2b of the lower mold 2 together. First to fifth lower mold clamping devices 16 to 20 for clamping 2b are provided. The first lower mold clamping device 16 clamps the side surface on the Y direction side of the first split mold 2a of the lower mold 2, and the second lower mold clamp device 17 is the other side in the Y direction of the first split mold 2a. The third lower mold clamping device 18 clamps the side surface on one side in the Y direction of the second divided mold 2b of the lower mold 2, and the fourth lower mold clamping device 19 is the second divided mold. The side surface on the other side in the Y direction in 2b is clamped.

  Since the configurations of the first to fourth lower mold clamping devices 16 to 19 are the same, only the configuration of the first lower mold clamping device 16 will be specifically described. The first lower mold clamping device 16 includes a cylinder 24 provided with a cylinder rod 25 that advances and retreats in the Y direction, a connecting member 26 that is connected to the cylinder rod 25 and extends in the X direction, and both ends of the connecting member 26. Each has a clamp member 27 fixed thereto. The clamp member 27 moves in the horizontal direction (Y direction) as the cylinder rod 25 moves forward and backward.

  As shown in FIG. 6, an inclined surface 27 a that is inclined upward toward the first split mold 2 a of the lower mold 2 is formed on the lower surface of the distal end portion of the clamp member 27. In addition, an inclined surface 2d corresponding to the inclined surface 27a of the clamp member 27 is formed in a portion corresponding to the clamp member 27 on the side surface on one side in the Y direction of the first split mold 2a of the lower mold 2. When the cylinder rod 25 advances toward the first split mold 2a of the lower mold 2, the clamp member 27 clamps the side surface on one side in the Y direction of the first split mold 2a. At this time, the inclined surface 27a of the clamp member 27 contacts the inclined surface 2d of the first split mold 2a and presses the first split mold 2a downward. Thus, the first lower mold clamping device 16 presses and fixes the first divided mold 2a to the upper surface of the lower mold support plate 6 by clamping the side surface of the first divided mold 2a on one side in the Y direction. In addition, you may comprise the part which comprises the inclined surface 27a in the clamp member 27 with the material (material which is hard to wear) different from another part. Similarly, the part which comprises the inclined surface 2d in the lower mold | type 2 may be comprised with the material (material which is hard to wear) different from another part.

  By the first and second lower mold clamping devices 16 and 17, the first split mold 2 a of the lower mold 2 is pressed and fixed to the upper surface of the lower mold support plate 6, and the third and fourth lower mold clamping devices 18. , 19, the second split mold 2 b of the lower mold 2 is pressed and fixed to the upper surface of the lower mold support plate 6.

  The fifth lower mold clamping device 20 clamps the side surface of the second mold 2b of the lower mold 2 opposite to the first divided mold 2a in the X direction. Specifically, the fifth lower mold clamping device 20 has two cylinders 30 provided with cylinder rods 31 that advance and retract in the Y direction. These two cylinders 30 are opposed to each other in the Y direction. A clamp member 32 having a triangular shape in plan view is fixed to the tip of each cylinder rod 31, and a pressing member 33 is interposed between the two clamp members 32. When the cylinder rods 31 of both cylinders 30 advance toward the counterpart cylinder 30, the pressing member 33 is pressed toward the second split mold 2b by the clamp member 32, and the second split mold 2b is split into the first split. It is pressed toward the mold 2a. That is, the clamp member 32 clamps the side surface of the second split mold 2b opposite to the first split mold 2a in the X direction via the pressing member 33. As a result, the split mating surfaces of the first split mold 2a and the second split mold 2b of the lower mold 2 are brought into a state of being brought into close contact (a close contact state). Therefore, the first split mold 2a and the second split mold 2b of the lower mold 2 are integrated via the lower mold support plate 6 by the first to fifth lower mold clamping devices 16 to 20. .

  The first split mold 2a of the lower mold 2 corresponds to a fixed split mold fixed to the upper surface of the lower mold support plate 6, and the second split mold 2b of the lower mold 2 is pressed toward the fixed split mold. It corresponds to the movable split type. The fifth lower mold clamping device 20 corresponds to a lower mold movable divided mold clamping device that presses the movable divided mold of the lower mold 2 toward the fixed divided mold side of the lower mold 2.

  As shown in FIGS. 3 and 5, on the lower surface of the movable platen 7, the first and second split molds 1a, 1a, 1b, so as to integrate the first and second split molds 1a, 1b of the upper mold 1 together. First to fifth upper mold clamping devices 36 to 40 for clamping 1b are provided. The first upper mold clamping device 36 clamps the side surface on one side in the Y direction of the first divided mold 1a of the upper mold 1, and the second upper mold clamping device 37 is the other side in the Y direction on the first divided mold 1a. The third upper mold clamping device 38 clamps the side surface on one side in the Y direction of the second divided mold 1b of the upper mold 1, and the fourth upper mold clamping device 39 is the second divided mold. The side surface on the other side in the Y direction in 1b is clamped.

  The configurations of the first to fourth upper mold clamping devices 36 to 39 are the same as those of the first to fourth lower mold clamping devices 16 to 19 (the same as the first to fourth lower mold clamping devices 16 to 19). The components are given the same reference numerals), and the first split mold 1a of the upper mold 1 is pressed against and fixed to the upper mold support plate 5 by the first and second upper mold clamping devices 36 and 37. The second split mold 1b of the upper mold 1 is pressed and fixed to the upper mold support plate 5 by the third and fourth upper mold clamping devices 38 and 39. The configuration of the fifth upper mold clamping device 40 is the same as that of the fifth lower mold clamping device 20 (the same components as those of the fifth lower mold clamping device 20 are denoted by the same reference numerals). By the fifth upper mold clamping device 40, the split mating surfaces of the first split mold 1 a and the second split mold 1 b of the upper mold 1 are brought into a state of being combined. Therefore, the first split mold 1a and the second split mold 1b of the upper mold 1 are integrated via the upper mold support plate 5 by the first to fifth upper clamp devices 36 to 40. . In FIG. 3, 1 d is an inclined surface similar to the inclined surface 2 d of the lower mold 2 formed on the upper mold 1.

  The first split mold 1 a of the upper mold 1 corresponds to a fixed split mold fixed to the lower surface of the upper mold support plate 5, and the second split mold 1 b of the upper mold 1 is fixed on the lower surface of the upper mold support plate 5. It corresponds to a movable split type pressed to the split mold side. The fifth upper mold clamping device 40 corresponds to an upper mold movable split mold clamping device that presses the movable split mold of the upper mold 1 to the fixed split mold side of the upper mold 1.

  The first and third upper clamping devices 36, 38 are provided with a retraction preventing member 43 that extends in the X direction and is movable in the X direction with respect to the cylinder rod 25. The mold clamping devices 37, 39 are provided with a retraction preventing member 43 that extends in the X direction and is movable in the X direction with respect to the cylinder rod 25. 19 is different. At one end of the retraction preventing member 43, an operation portion 43a is provided for an operator to move the retraction preventing member 43 in the X direction. Then, the cylinder rod 25 of the first to fourth upper mold clamping devices 36 to 39 advances and the clamp member 27 clamps the side surfaces on both sides in the Y direction of the first and second split molds 1a and 1b. When an operator moves the retraction prevention member 43 toward the fifth upper mold clamping device 40, the first to fourth lower mold clamping devices 16 to 19 are temporarily in an abnormal state. Even if it operates, the retraction of the clamp member 32 is prevented. That is, a through hole 43b into which the clamp member 27 is fitted is formed at a position corresponding to the clamp member 27 in the X direction in the retraction preventing member 43, and the operator holds the retraction preventing member 43 in the fifth upper mold clamping device 40. When moved to the side, the position of the through hole 43b is shifted with respect to the position of the clamp member 27, so that the clamp member 27 cannot be retracted (see FIGS. 1 and 3). When releasing the clamping of the first and second split molds 1 a and 1 b by the clamp member 27, the operator moves the retraction prevention member 43 to the side opposite to the fifth upper mold clamping device 40. By doing so, the position of the through hole 43b becomes the same as the position of the clamp member 27 (see FIGS. 5 and 9), and the clamp member 27 can be retracted. The passage hole 43c through which the cylinder rod 25 passes in the retraction preventing member 43 is formed in a long hole shape that is long in the X direction so that the retraction preventing member 43 can move in the X direction with respect to the cylinder rod 25.

  As shown in FIG. 5, the upper mold support plate 5 is provided with through holes 5 a penetrating in the thickness direction (vertical direction), but first to fourth provided in the lower mold support plate 6. Positioning members such as the positioning keys 11 to 14 are not provided. A through hole similar to the through hole 5a is formed at a position corresponding to the through hole 5a in the movable platen 7.

  The first and second split molds 1a and 1b of the upper mold 1 are not positioned on the upper mold support plate 5, but instead of the first and second split molds 2a and 2b positioned on the lower mold support plate 6. Positioned with respect to each other. That is, positioning dowels 2e are respectively formed on the mating surface (upper surface) of the lower mold 2 with the upper mold 1 in the first and second divided molds 2a and 2b. Positioning holes 1e into which positioning dowels 2e are fitted are formed on the mating surface (lower surface) of the two-divided molds 1a and 1b with the lower mold 2. However, the second split mold 1b of the upper mold 1 is slightly movable in the X direction with respect to the second split mold 2b while being positioned on the second split mold 2b of the lower mold 2. As will be described later, when assembling the mold, the upper mold 1 is placed on the first to fifth upper mold clamps with the upper mold 1 placed on the lower mold 2 clamped as described above. Clamp with devices 36-40. By doing so, the positional relationship between the upper mold 1 and the lower mold 2 is accurately maintained.

  As shown in FIG. 7, a plurality of insertion holes 2f are formed in the bottom wall portion of the cavity forming recesses 2c of the lower mold 2 so as to extend in the vertical direction and penetrate the bottom wall portion. Ejector pins 47 are respectively inserted into the holes 2f. Here, the insertion hole 2f, the ejector pin 47, etc. are shown only in FIG. 7, and description is abbreviate | omitted in FIG. 1, FIG. In FIG. 7, the description of the fixed platen 8 is omitted. Depending on the size of the cross-sectional area of the cavity forming recess 2c cut along the horizontal direction, only one insertion hole 2f may be formed in one cavity forming recess 2c.

  The ejector pin 47 is erected and fixed to a first ejector plate 48 made of duralumin provided on the lower side of the lower die. The cavity forming recess 2c is inserted into the insertion hole 2f from the lower side of the lower die 2. It is inserted to be able to advance and retreat. In the present embodiment, only one first ejector plate 48 and a later-described guide plate 51 are provided in the mold making die, but may be provided for each cavity forming recess 2c. The weight of the first ejector plate 48 including the ejector pins 47 is lighter than a later-described second ejector plate 49 and can be held by an operator.

  The ejector pin 47 is guided by a guide hole 51 a of a guide plate 51 provided at a height position between the lower mold 2 and the first ejector plate 48. The guide plate 51 is mounted in a horizontally extending state on a step portion 6b formed in the peripheral wall portion of the through hole 6a of the lower die support plate 6, and penetrates in the thickness direction (vertical direction) of the guide plate 51. The ejector pin 47 is inserted through the guide hole 51a. When the lower mold 2 is placed on the upper surface of the lower mold support plate 6, the ejector pins 47 are basically guided by the insertion holes 2 f of the lower mold 2. However, without the guide plate 51, when the lower die 2 is placed on the upper surface of the lower die support plate 6, the ejector pin 47 is inserted into the insertion hole 2f of the lower die 2 because the tip end side of the ejector pin 47 fluctuates. Becomes difficult. Therefore, by providing the guide plate 51, the fluctuation of the tip side of the ejector pin 47 is suppressed, and the lower die 2 can be easily placed on the upper surface of the lower die support plate 6 while the ejector pin 47 is inserted into the insertion hole 2f. Try to be able to place it.

  At the four corners of the lower mold 2 (two corners on one side in the X direction of the first split mold 2a and two corners on the other side in the X direction of the second split mold 2b), the return pin 52 is moved up and down. A guide member 53 is provided for guiding so as to be movable in the direction. The return pin 52 is erected and fixed to a second ejector plate 49 provided on the lower side of the first ejector plate 48 so that the upper portion of the return pin 52 penetrates the guide member 53 in the vertical direction. A fitting hole 53a is formed so as to be movable in the vertical direction. Note that only one second ejector plate 49 is provided in the mold making die.

  The upper end portion of the return pin 52 is an enlarged diameter enlarged portion 52a, and the upper end portion of the fitting hole 53a is a large diameter into which the enlarged diameter portion 52a is fitted, corresponding to the enlarged diameter portion 52a. Part 53b. When the upper mold 1 and the lower mold 2 are in a state of being combined with each other on the mating surface, the enlarged diameter portion 52a of the return pin 52 is fitted into the large diameter portion 53b of the fitting hole 53a. At this time, the lower surface of the enlarged diameter portion 52a comes into contact with the bottom surface of the larger diameter portion 53b, so that the return pin 52 and the second ejector plate 49 cannot be lowered further.

  The first ejector plate 48 is detachably attached to the second ejector plate 49 by an ejector plate attaching / detaching device 61. In this embodiment, the ejector plate attaching / detaching device 61 is provided so as to be slidable along the substantially L-shaped lock member 62 provided on the lower surface of the first ejector plate 49 and the lower surface of the second ejector plate 49. It has a detachable member 63.

  The lock member 62 extends from the lower surface of the first ejector plate 48 through the opening 49a formed in the second ejector plate 49 to the lower side of the second ejector plate 49, and the tip end 62a thereof extends in the horizontal direction. It is bent.

  As shown in FIG. 8, in the detachable member 63, two support pins 64 respectively provided at two positions away from each other in the Y direction on the lower surface of the second ejector plate 49 are fitted in the long holes 63 c of the detachable member 63, respectively. Thus, the second ejector plate 49 is supported so as to be slidable in the Y direction. The detachable member 63 has an engaging portion 63a that is located above the distal end portion 62a of the lock member 62 and can be engaged with the distal end portion 62a, and the detachable member 63 slides in the Y direction. An engagement position at which the engaging portion 63a engages with the distal end portion 62a of the lock member 62 (see FIG. 8A), and an engagement that retracts from the upper end of the distal end portion 62a of the lock member 62 and releases the engagement. It is configured to be movable between the combined release positions (see FIG. 8B). In the present embodiment, the detachable members 63 are respectively provided at two positions in the X direction on the second ejector plate 49 (in FIG. 8, the detachable members 63 provided at one of the two positions in the X direction are shown. ).

  As shown in FIG. 8B, each of the detachable members 63 is provided with four engaging portions 63a. Two of the four engaging portions 63 a are located at the same position in the Y direction on the detachable member 63, and are provided on the side surfaces of the detachable member 63 on both sides in the X direction. Corresponding to these engaging portions 63a, a lock member 62 and an opening 49a are provided.

  One end of the detachable member 63 is provided with an operation portion 63b for the operator to push and pull the detachable member 63, and when the operator pushes the detachable member 63 via the operation portion 63b, The detachable member 63 moves to the engagement position. As a result, the engaging portion 63 a of the detachable member 63 is positioned above the tip end portion 62 a of the lock member 62 and engages with the tip end portion 62 a, so that the first ejector plate 48 is attached to the second ejector plate 49. It becomes a state. As shown in FIG. 8A, the movement of the second ejector plate 49 corresponding to the operation portion 63b is prevented from moving so that the detachable member 63 is not displaced from the engagement position and moved to the engagement release position. A member 65 is provided to be movable up and down. The movement preventing member 65 is lowered by the gravity and prevents the attachment / detachment member 63 from being displaced from the engagement position.

  On the other hand, the detachable member 63 moves to the disengagement position by pulling the detachable member 63 via the operation portion 63b of the detachable member 63 while the operator holds the movement preventing member 65 and raises it. . Thereby, the engaging part 63a retracts from the upper side of the front end part 62a of the lock member 62 and releases the engagement. Then, the first ejector plate 48 can be removed from the second ejector plate 49 by pulling the first ejector plate 48 upward. If the lower die 2 is removed from the lower die support plate 6 as will be described later, the first ejector plate 48 including the ejector pins 47 can be pulled up to the upper side of the lower die support plate 6 through the through holes 6a.

  On the lower surface of the second ejector plate 49, a pressing portion 49b that is pressed upward by a push rod (not shown) configured to be movable back and forth in a vertical direction by a cylinder (not shown) is formed to project. In a state where the first ejector plate 48 is attached to the second ejector plate 49 and the upper die 1 is removed from the lower die 2, the pressing portion 49b is pushed upward by the advancement of the push rod. The first ejector plate 48 attached to the two ejector plate 49 is also pressed upward, so that the ejector pin 47 advances into the cavity forming recess 2c of the lower die 2. As a result, the mold formed by the cavity is pushed out from the cavity forming recess 2c, and the mold can be taken out. Note that the return pin 52 also rises as the second ejector plate 49 rises.

  When the push rod moves backward after the mold is taken out, the first and second ejector plates 48 and 49 are lowered by their own weight. Thereby, the ejector pin 47 and the return pin 52 return to the original state before the ascent. However, the ejector pin 47 and the return pin 52 may not return to the original state only by the weight of the first and second ejector plates 48 and 49 alone. Even in such a case, when the upper mold 1 and the lower mold 2 are put together so as to bring the mold into a closed state, the upper end portion of the return pin 52 is pressed downward by the upper mold 1. The pin 47 and the return pin 52 reliably return to the original state.

  Although not shown, a blow head having a nozzle connected to an inlet (not shown) of the upper die 1 and containing cast sand is provided above the upper die support plate 5. Then, casting sand is blown into the cavity from the nozzle of the blow head through the inlet and filled.

  Next, a procedure for exchanging the upper mold 1, the lower mold 2 and the ejector pin 47 with new ones in order to mold another mold, that is, a mold mold changing process will be described.

  As shown in FIG. 9 (a), the upper mold 1 and the lower mold 2 are brought into a state where the upper mold 1 and the lower mold 2 are aligned with each other by the mold clamping device in advance (the mold closed state). It is moved to the opposite side to the upper mold clamping device 40 (see FIGS. 3 and 5). In this mold closed state, the clamps of the first and second split molds 1a and 1b of the upper mold 1 by the first to fifth upper mold clamping devices 36 to 40 (see FIGS. 3 and 5) are released.

  Subsequently, as shown in FIG. 9B, the mold clamping device is operated to raise the movable platen 7 and the upper mold support plate 5 to the mold opening position. When the upper mold support plate 5 is lifted by releasing the clamp, the upper mold 1 does not rise and remains on the lower mold 2. Then, as shown in FIG. 9C, the operator removes from the lower mold 2 all the divided molds (first and second divided molds 1 a and 1 b) of the upper mold 1 whose clamp has been released. At this time, since the first and second split molds 1a and 1b of the upper mold 1 are small and light, the operator can easily remove the split molds 1a and 1b from the lower mold 2 by holding them.

  Next, the first and second lower mold clamping devices 16 to 20 (see FIGS. 2 and 4) release the clamp of the first and second divided molds 2a and 2b of the lower mold 2, and thereafter, FIG. As shown in d), the operator removes from the lower mold support plate 6 all the divided molds (first and second divided molds 2a and 2b) of the lower mold 2 whose clamp has been released. At this time, the ejector pin 47 (see FIGS. 2 and 4) comes out of the insertion hole 2 f of the lower mold 2. Since the first and second split molds 2a and 2b of the lower mold 2 are small and light, the operator can easily remove the split molds 2a and 2b from the lower mold support plate 6 by holding them.

  Subsequently, the operator pulls the operation portion 63b of the attachment / detachment member 63 in the ejector plate attachment / detachment device 61 to move the attachment / detachment member 63 to the disengagement position, and the lock member 62 of the engagement portion 63a of the attachment / detachment member 63 is moved. The engagement with the distal end portion 62a is released (see FIG. 8B). Thereafter, the operator removes the first ejector plate 48 including the ejector pins 47 from the second ejector plate 49 by pulling the first ejector plate 48 upward of the lower mold support plate 6 through the through hole 6a of the lower mold support plate 6. When the first ejector plate 48 is lifted upward, the guide plate 51 comes into contact with the upper surface of the first ejector plate 48 and is lifted upward together with the first ejector plate 48.

  Next, the operator inserts a new first ejector plate 48 provided with a new ejector pin 47 corresponding to the new lower mold 2 from the upper side of the through hole 6a of the lower mold support plate 6 through the through hole 6a. Then, the first ejector plate 48 is removed to the upper side of the second ejector plate 49. At this time, the new guide plate 51 is placed on the upper surface of the new first ejector plate 48 with the new ejector pin 47 inserted through the guide hole 51a. The new guide plate 51 is placed on the step portion 6b in the peripheral wall portion of the through hole 6a while the new first ejector plate 48 is lowered through the through hole 6a of the lower die support plate 6. Therefore, the new guide plate 51 cannot be lowered any more while being placed on the stepped portion 6b, and is separated from the upper surface of the new first ejector plate 48.

  Then, the operator moves the distal end portion 62 a of the lock member 62 provided on the new first ejector plate 48 to the lower side of the second ejector plate 49 through the opening 49 a of the second ejector plate 49. In this state, the operator pushes the attachment / detachment member 63 of the ejector plate attachment / detachment device 61 via the operation portion 63b to move it to the engagement position. Thereby, the engaging part 63a of the detachable member 63 is engaged with the tip end part 62a of the lock member 62 (see FIG. 8A). In this way, the new first ejector plate 48 on which the new ejector pins 47 are erected is attached to the second ejector plate 49 by the ejector plate attaching / detaching device 61. Since the first ejector plate including the ejector pins 47 and the guide plate 51 is lightweight, the first ejector plate 48 can be easily replaced.

  Subsequently, the first and second split molds 2a and 2b of the new lower mold 2 are placed on the upper surface of the lower mold support plate 6 from which the lower mold 2 has been removed. At this time, the new ejector pin 47 is inserted into the insertion hole 2f of the new lower mold 2. Since the new ejector pin 47 is prevented from wobbling on the tip side by the guide hole 51a of the new guide plate 51, the new lower die 2 is inserted into the insertion hole 2f while the new ejector pin 47 is inserted into the lower die. It can be easily placed on the upper surface of the support plate 6. When the first divided mold 2a is placed on the upper surface of the lower mold support plate 6, the first divided mold 2a is positioned with respect to the lower mold support plate 6 by the first to third positioning keys 11 to 13, and the second mold 2a is positioned. When placing the split mold 2b, the fourth positioning key 14 positions the second split mold 2b with respect to the lower mold support plate 6.

  Next, the first divided mold 1a of the new upper mold 1 is placed on the first divided mold 2a of the new lower mold 2 so that the mating surfaces of the two molds 1a and 2a are aligned, and the new lower mold 2 The second split mold 1b of the new upper mold 1 is placed on the second split mold 2b so that the mating surfaces of both molds 1b and 2b are aligned. At this time, due to the positioning dowel 2e in the first split mold 2a of the lower mold 2 and the positioning hole 1e in the first split mold 1a of the upper mold 1, the first mold 1 of the upper mold 1 relative to the first split mold 2a of the lower mold 2 is used. The first split mold 1a is positioned, and the second split mold 2b of the lower mold 2 is formed by the positioning dowel 2e in the second split mold 2b of the lower mold 2 and the positioning hole 1e in the second split mold 1b of the upper mold 1. The second split mold 1b of the upper mold 1 is positioned with respect to.

  Subsequently, the first and second lower mold clamping devices 16 to 20 connect the first and second divided molds 2 a and 2 b of the new lower mold 2 on the upper surface of the lower mold support plate 6 to the lower mold support plate 6. (The same state as in FIG. 9B).

  Thereafter, the mold clamping device is operated to lower the movable platen 7 and the upper mold support plate 5 to the mold closing position. As a result, the lower surface of the upper mold support plate 5 substantially contacts the upper surface of the new upper mold 1. In this state, the first and fifth upper mold clamping devices 36 to 40 connect the first and second divided molds 1a and 1b of the new upper mold 1 to the upper mold support plate 5 on the new lower mold 2. (The same state as in FIG. 9A). In the present embodiment, finally, the operator moves the retraction preventing member 43 toward the fifth upper mold clamping device 40, and the clamp members 27 of the first to fourth upper mold clamping devices 36 to 39 are retreated. To prevent. Thus, the changeover of the mold making mold is completed.

  Here, in order to perform mold correction of the mold making mold, the detachment work for attaching and detaching the upper mold 1 and the lower mold 2 to and from the upper mold support plate 5 and the lower mold support plate 6 is also the above-described changeover work. It is the same. However, in the attaching / detaching work for mold correction, it is not necessary to attach and remove the first ejector plate 48 from the second ejector plate 49.

  Therefore, in this embodiment, the operator does not need to lift the first and second split molds 1a, 1b, 2a, 2b of the upper mold 1 and the lower mold 2 and the first ejector plate 48 using a hoist or the like. And can be easily moved by hand. In addition, the operator can easily engage or disengage the engaging portion 63a of the attaching / detaching member 63 with the distal end portion 62a of the locking member 62 by pushing or pulling the attaching / detaching member 63. As a result, the first ejector plate 48 can be easily attached to and detached from the second ejector plate 49. Therefore, it is possible to improve the workability of the mold making mold changing work and the attaching / detaching work for correcting the mold.

  The present invention is not limited to the embodiment described above, and can be substituted without departing from the spirit of the claims.

  For example, in the above embodiment, the number of divisions for each of the upper mold 1 and the lower mold 2 is two, but the number is not limited to two, and may be three or more. The number of divisions may be set so that the weight of one division type can be held by an operator.

  Moreover, in the said embodiment, although the upper mold | type 1 and the lower mold | type 2 and the 1st ejector plate 48 were made from duralumin, what kind of material may be sufficient if an operator can have in a hand. However, the upper mold 1 and the lower mold 2 need to be made of materials that do not have a problem in moldability of the mold. Further, in order to make the upper mold 1 and the lower mold 2 as light as possible, it is preferable to make the upper mold 1 and the lower mold 2 as thin as possible.

  The above-described embodiments are merely examples, and the scope of the present invention should not be interpreted in a limited manner. The scope of the present invention is defined by the scope of the claims, and all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  The present invention includes an upper mold and a lower mold, and a mold making in which a cavity filled with casting sand is formed between the upper mold and the lower mold in a state where the upper mold and the lower mold are aligned with each other on the mating surfaces. This is useful for the mold and the mold changing method, and is useful when the upper and lower molds are large and heavy.

1 Upper mold 1a 1st division type (fixed division type)
1b Second division type (movable division type)
1c Cavity forming recess 2 Lower mold 2a First split mold 2b Second split mold 2c Cavity forming recess 2f Insertion hole 6 Lower mold support plate (lower mold support member)
16 1st lower mold clamping device 17 2nd lower mold clamping device 18 3rd lower mold clamping device 19 4th lower mold clamping device 20 5th lower mold clamping device (clamp device for lower mold movable split type)
27 Clamp Member 32 Clamp Member 36 First Upper Clamp Device 37 Second Upper Clamp Device 38 Third Upper Clamp Device 39 Fourth Upper Clamp Device 40 Fifth Upper Clamp Device (Upper Movable) Split type clamp device)
47 Ejector pin 48 First ejector plate 49 Second ejector plate 52 Return pin 53 Guide member 53a Fitting hole 61 Ejector plate attaching / detaching device 62 Lock member 62a End portion of lock member 63 Detaching member 63a Engaging portion

Claims (6)

A mold making mold having an upper mold and a lower mold, in which a cavity filled with casting sand is formed between the upper mold and the lower mold in a state where the upper mold and the lower mold are aligned with each other. And
Each of the upper mold and the lower mold is composed of a plurality of divided molds configured to be divided in the horizontal direction,
An upper mold and a lower mold clamping device for clamping the divided molds so as to integrate the plurality of divided molds of the upper mold and the lower mold, respectively;
An ejector pin that is inserted into an insertion hole formed in the bottom wall portion of the cavity forming recess of the lower mold so as to extend in the vertical direction so as to be able to advance and retract from the lower side of the lower mold to the cavity forming recess;
A return pin that is guided by a guide member provided on the side of the lower die so as to be movable in the vertical direction and is pressed downward by the upper die when the upper die and the lower die are combined. ,
A first ejector plate provided on the lower side of the lower mold, wherein the ejector pins are erected;
A second ejector plate which is configured to be pressed upward by an extrusion rod configured to be movable back and forth in the vertical direction, and wherein the return pin is erected,
A mold making mold, comprising: an ejector plate attaching / detaching device for detachably attaching the first ejector plate to the second ejector plate. The mold making die according to claim 1,
The upper mold and lower mold clamping devices each have a clamp member movable in the horizontal direction,
The mold making mold characterized in that the clamp members of the upper mold and lower mold clamping devices are configured to clamp the side surfaces of the divided molds of the upper mold and the lower mold, respectively. The mold making die according to claim 1 or 2,
The ejector plate attaching / detaching device is
The tip of the first ejector plate extends from the lower surface of the first ejector plate to the lower side of the second ejector plate through an opening formed in the second ejector plate provided on the lower side of the first ejector plate. A substantially L-shaped locking member that is bent in the horizontal direction;
A detachable member provided on the lower surface of the second ejector plate so as to be slidable along the lower surface of the second ejector plate;
Have
The detachable member has an engaging portion that is located on the upper side of the distal end portion of the lock member and can be engaged with the distal end portion, and the engaging portion is slid by the slide of the detachable member. It is comprised so that it can move between the engagement position engaged with the front-end | tip part of this, and the engagement release position which retracts | saves from the upper side of the front-end | tip part of the said lock member, and cancels | releases the said engagement. Mold making mold. In the mold making mold according to any one of claims 1 to 3,
Each of the upper mold and the lower mold is divided into a fixed split mold and a movable split mold.
The upper mold clamping device includes an upper mold movable split mold clamping device for pressing the upper mold movable split mold toward the upper mold fixed split mold,
The lower mold clamping device includes a lower mold movable divided mold clamping device that presses the lower movable movable mold to the fixed divided mold side of the lower mold. In the mold making mold according to any one of claims 1 to 4,
A mold making mold, wherein the upper mold, the lower mold, and the first ejector plate are made of duralumin. A mold-molding mold stage comprising an upper mold and a lower mold, wherein a cavity filled with casting sand is formed between the upper mold and the lower mold in a state where the upper mold and the lower mold are aligned with each other on the mating surfaces. A replacement method,
Each of the upper mold and the lower mold is composed of a plurality of divided molds configured to be divided in the horizontal direction,
An upper mold and a lower mold clamping device for clamping the divided molds so as to integrate the plurality of divided molds of the upper mold and the lower mold, respectively;
An ejector pin that is inserted into an insertion hole formed in the bottom wall portion of the cavity forming recess of the lower mold so as to extend in the vertical direction so as to be able to advance and retract from the lower side of the lower mold to the cavity forming recess;
A return pin that is guided by a guide member provided on the side of the lower die so as to be movable in the vertical direction and is pressed downward by the upper die when the upper die and the lower die are combined. ,
A first ejector plate provided on the lower side of the lower mold, wherein the ejector pins are erected;
A second ejector plate which is configured to be pressed upward by an extrusion rod configured to be movable back and forth in the vertical direction, and wherein the return pin is erected,
An ejector plate attaching / detaching device for detachably attaching the first ejector plate to the second ejector plate;
The lower mold and the guide member are provided on the upper surface of the lower mold support member,
In a state where the upper mold and the lower mold are combined with each other on the mating surface, the step of releasing the upper mold split mold clamp by the upper mold clamp device;
A step of removing the entire divided mold of the upper mold released from the clamp from the lower mold;
After removing the upper mold from the lower mold, releasing the lower mold split mold clamp by the lower clamp device;
Removing the entire divided mold of the lower mold released from the clamp from the upper surface of the lower mold support member;
Removing the first ejector plate from the second ejector plate by setting the first ejector plate on which the ejector pins are erected from the second ejector plate by the ejector plate attaching / detaching device;
Attaching a new first ejector plate on which a new ejector pin is erected by the ejector plate attaching / detaching device to the second ejector plate from which the first ejector plate is removed;
A step of placing a new lower mold all-divided mold on the upper surface of the lower mold support member from which the lower mold has been removed so that the new ejector pin is inserted into the insertion hole of the lower mold;
On the new lower mold, placing the new upper mold all divided mold so that the mating surfaces of the two molds are combined,
Integrating the new split molds on the upper surface of the lower mold support member with the lower mold clamping device; and
After the integration of the new lower mold split mold, a step of integrating the new upper mold split molds on the new lower mold with the upper clamp device;
A method for changing the mold for mold making, comprising:

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