JP2009154418A - Link housing structure of mold clamping apparatus and manufacturing method of ring gear used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a link housing structure of a mold clamping apparatus which enables easy adjustment of the load balance and to provide a manufacturing method of a ring gear used for the link housing structure. <P>SOLUTION: The link housing structure of the mold clamping apparatus, which is used for a mold clamping apparatus capable of regulating the mold clamping force of a movable mold and a fixed mold by relatively advancing/retreating tie bars having male threads formed on their surfaces to/from the link housing, includes nut gears to be screwed with the tie bars, ring gears meshed with the nut gears, and a driving means that moves the link housing by driving the nut gears through the ring gears. The ring gear has such a construction that a removably attachable member, which is a part of the part meshing with the nut gear, is furnished to be capable of being attached/detached and a cutout part is formed which permits at least one nut gear to freely rotate to the ring gear when the removably attachable member comes out of the ring gear. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a link housing structure of a toggle type mold clamping device capable of easily adjusting a load balance and a method of manufacturing a ring gear used therefor.

  Conventionally, a mold clamping device such as a die casting machine or an injection molding machine has been used to obtain a molded product. For example, a die-casting machine can manufacture a highly accurate casting by putting molten metal into a mold and applying pressure. As such a die-casting machine, there is one described in Patent Document 1, for example. . As shown in FIG. 7, this die casting machine has a fixed die 202 provided on one side face, a fixed die plate 206 provided with four tie bars 204 extending horizontally from four corners, and a fixed die 202. A movable die 208 is provided on a side surface of the movable die 208, and the movable die plate 210 is supported by the tie bar 204 so as to be movable with respect to the fixed die plate 206. And a link housing 216 having a cylinder 214 for driving 212 (see Patent Document 1).

  As shown in FIGS. 8 and 9, the four tie bars 204 have male threads 218 formed on the outer peripheral surface on the link housing 216 side. The link housing 216 is screwed into each of the male screws 218 and has four nut gears 220 formed with teeth functioning as gears on the outer peripheral surface, and a ring gear 222 formed in a ring shape and meshable with the four nut gears 220. And a drive motor 224 capable of driving the ring gear 222 via the drive gear 226.

The die casting machine 200 drives the drive motor 224 to simultaneously rotate the four nut gears 220 via the drive gear 226 and the ring gear 222, thereby moving the four tie bars 204 forward and backward relative to the link housing 216. By doing so, the clamping force of the movable mold 204 and the fixed mold 202 can be adjusted.
JP 2002-336949 A

  By the way, the shape of a metal mold | die is various, It is necessary to adjust the load applied from each tie bar 204, ie, load balance, according to the shape. When adjusting the load balance in the above-described die casting machine 200, first, the lock mechanism 228 of the ring gear 222 is released, and then the ring gear 222 is removed from the link housing 216, whereby the ring gear 222 and each nut gear 220 are connected. Release the meshing state. Next, the load from each tie bar 204 is adjusted by rotating each nut gear 220 separately. However, since the ring gear 222 is large in size, there is a problem that the work for removing it requires a great deal of labor.

  Therefore, an object of the present invention is to provide a link housing structure of a mold clamping device and a method of manufacturing a ring gear used therefor, which can easily adjust a load balance.

  In order to achieve the above object, the present inventors have conducted extensive research, and as a result, the ring gear is provided with a notch portion in which at least one nut gear can freely rotate with respect to the ring gear, thereby adjusting the load balance. Has been found to be easy. That is, the present invention is used in a mold clamping device capable of adjusting the mold clamping force of a movable mold and a fixed mold by moving a tie bar having a male thread formed on the surface thereof relative to the link housing. In the link housing structure of the mold clamping device, a nut gear screwed to the tie bar, a ring gear meshed with the nut gear, and a drive means for moving the link housing by driving the nut gear via the ring gear; The ring gear is configured so that a detachable member that is a part of a portion engaging with the nut gear is detachable, and when the detachable member is detached from the ring gear, at least one of the nut gears is attached to the ring gear. On the other hand, it is characterized in that a notch that allows free rotation is formed.

  In the link housing structure of the mold clamping device, the same number of attaching / detaching members as the nut gear may be provided, and the number of notches may be aligned with the position of the nut gear to form the same number as the nut gear.

  Further, the present invention is a method for manufacturing a ring gear used in the link housing structure of the mold clamping device described above, wherein a part of the meshing portion is formed on a peripheral surface of a ring-shaped member in which teeth are not formed on the peripheral surface. A first step of forming the cut-out portion to which a cut is attached; a second step of forming a pre-process detachable member that has no teeth formed on a peripheral surface and can be fitted into the cut-out portion; And a third step of forming gear teeth on the outer peripheral surface of the ring-shaped member and the detachable member in a state in which the pre-processing detachable member is fitted in the notch portion. is there.

  Still further, the present invention provides a mold clamping device capable of adjusting the mold clamping force of a movable mold and a fixed mold by moving a tie bar having a male thread formed on the surface thereof relative to the link housing. In a link housing structure of a mold clamping device used, a nut gear screwed to a tie bar, a ring gear meshed with the nut gear, and a driving means for moving the link housing by driving the nut gear via the ring gear The ring gear includes a first ring gear portion that meshes with the nut gear, and a second ring gear portion that meshes with a drive gear that is provided in the driving means and meshes with the ring gear, The ring gear portion includes a notch portion that allows at least one of the nut gears to freely rotate with respect to the first ring gear portion. Characterized in that it is formed.

  As described above, according to the present invention, it is possible to provide a link housing structure of a mold clamping device capable of easily adjusting a load balance and a method of manufacturing a ring gear used therefor.

  Next, a first embodiment of a link housing structure of a die casting machine according to the present invention will be described in detail with reference to the drawings. 1 is a side view schematically showing a nut gear and a ring gear of the link housing structure of the die casting machine according to the first embodiment, FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG. a) is a front view showing a detachable member of the ring gear, (b) is a front view showing a state where the detachable member is removed from the ring gear, and FIG. 4 (a) is a cross-sectional view taken along line BB of FIG. 3 (a). Sectional view along line ', (b) is a sectional view along line CC' in FIG. 3 (b).

  In the link housing of the die casting machine according to the first embodiment, the four tie bars 104 having the male threads 118 formed on the surface thereof are moved forward and backward relative to the link housing, thereby clamping the movable mold and the fixed mold. It is used for a mold clamping device capable of adjusting the force, and is formed into a ring shape with four nut gears 120 screwed into each of these male screws 118 and formed with teeth functioning as gears on the outer peripheral surface, A ring gear 122 that can mesh with these four nut gears 120 and a drive motor 124 that can drive the ring gear 122 via a drive gear 126 are provided.

  The ring gear 122 is configured to be detachable with a detachable member 130 that is a part of a portion that meshes with the nut gear 120. That is, a notch 142 that is recessed in the center direction is formed on the peripheral surface of the ring gear 122, and the detachable member 130 can be closely fitted to the notch 142. The detachable member 130 is formed in a horizontally long shape extending in the lateral width direction. The width of the detachable member 130 is such that when the detachable member 130 is detached from the ring gear 122, the meshed state of the ring gear 122 and the nut gear 120 is released, that is, the nut gear. The length 120 can be freely rotated without contacting the teeth of the ring gear 122. For example, the ring gear 122 and the nut gear 120 have a width including the teeth of the ring gear 122 that contacts when the gears mesh with the nut gear 120 and at least one tooth on the outer side in the circumferential direction. One side surface of the detachable member 130 corresponding to the outer peripheral surface of the ring gear 122 is formed in an arc shape having the same radius of curvature as that of the ring gear 222, and teeth are formed on the surface thereof. The teeth of the detachable member 130 have the same pitch and the same shape as the ring gear 122 and are formed so as to be continuous with the teeth of the ring gear 222 when attached to the ring gear 122. Further, a flange 132 that is continuous with the surface of the detachable member 130 is projected on the side surface opposite to the surface on which the teeth are formed. The flange 132 is formed with four holes 136 aligned in the width direction, and between the two holes 136 and 136 on the right side and between the two holes 136 and 136 on the left side, a screw is formed on the inner peripheral surface. Holes 137 and 137 in which grooves are formed are formed.

  The lateral width of the notch 142 of the ring gear 122 is the same as or slightly larger than that of the detachable member 130 so that the detachable member 130 can be closely fitted, and the vertical width, that is, the depth is the detachable member when the detachable member 130 is mounted. The peripheral surface of 130 is continuous with the peripheral surface of the ring gear 122, and the teeth of the detachable member 130 are formed so as to be continuous with the teeth of the ring gear 122 to form a gear. Further, a concave portion 134 having the same lateral width as the notch portion 142 and continuing to the notch portion 142 on the side of the notch portion 142 is formed at the center side of the notch portion 142 on the surface of the ring gear 122. . The depth of the recess 134 is the same as the thickness of the flange 132 of the detachable member 130, and the vertical width is also formed to be the same as the protruding width of the flange 132. By forming the recess 134 in this way, the flange 132 can be fitted into the recess 134 when the detachable member 130 is attached to the notch 142. Further, four screw holes 138 are formed on the surface of the recess 134 where the four holes 136 on the flange 132 are aligned when the flange 132 is fitted in the recess 134. The attaching / detaching member 130 can be fixed to the ring gear 122 by screwing the fixing screw 140 into the screw hole 138.

  In the link housing structure of the die-cast machine according to the first embodiment, in order to adjust the load balance, first, the drive motor 124 is driven, and the detachable member 130 is moved to a position where it engages with the nut gear 120 to be adjusted. . Next, after removing the fixing screw 140, when the screw is inserted into the extraction hole 137 and screwed, the tip of the screw hits the surface of the recess 134, and when the screw is further screwed, the detachable member 130 is removed from the ring gear 122. Then, the detachable member 130 is removed from the ring gear 122 by hand or the like. When the detachable member 130 is removed from the ring gear 122, the meshing state of the ring gear 122 and the nut gear 120 is released, and the nut gear 120 can freely rotate. As a result, the tie bar 104 screwed into the nut gear 120 can be moved forward and backward relative to the link housing structure independently of the other tie bars 104, and the load balance can be adjusted.

  In the link housing structure of the die casting machine according to the first embodiment, the number of the detachable members 130 is one, but a plurality of detachable members may be provided. In that case, the number of the notch portions 142 is the same as the number of the detachable members 130. To form. For example, by forming a plurality of notches 142 at positions facing the nut gear 120 and providing the same number of attachment / detachment members 130, the meshing state of the plurality of nut gears 120 can be released simultaneously, and the plurality of nut gears 120 can be freely rotated simultaneously. Can be made.

  Next, the manufacturing method of the ring gear used for the link housing structure of the die-casting machine which concerns on 1st Embodiment is demonstrated based on FIG. 5A is a front view showing a state in which a notch is formed in the ring-shaped member, FIG. 5B is a front view of the pre-processing detachable member, and FIG. 5C is a pre-processing detachable member in the notch. The front view which shows the state which fitted, (d) is a front view which shows a ring gear.

  First, a ring-shaped member 143 having the same inner diameter as that of the ring gear 120 is formed, and the shapes of the notch 142 and the recess 134 are cut from the outer peripheral surface side of the ring-shaped member 143 as shown in FIG. Process. On the other hand, as shown in FIG. 5B, the pre-process detachable member 144 that can be fitted into the notch 142 and the recess 134 of the ring-shaped member 143 is cut. At this time, gear teeth are not formed on the peripheral surfaces of the ring-shaped member 143 and the pre-processing attachment / detachment member 144. Next, as shown in FIG. 5C, after forming a punch hole in the flange of the pre-processing attachment / detachment member 144, the pre-processing attachment / detachment member 144 is attached to the notch 142 of the ring-shaped member 143, and in this state Holes to be the holes 136 and the screw holes 138 are drilled. Thereafter, the pre-processing attachment / detachment member 144 is removed from the ring-shaped member, and processing into the shape of the hole 136 and formation of the thread groove of the screw hole 138 are performed. Next, as shown in FIG. 5D, the pre-processing attachment / detachment member 144 is again attached to the notch 142 of the ring-shaped member 143 and fixed by the fixing screw 140. In this state, the ring-shaped member 143 and The peripheral surface of the pre-processing detachable member 144 is cut into the shape of a gear tooth.

  Next, a second embodiment of the link housing structure of the die casting machine according to the present invention will be described in detail with reference to the drawings. FIG. 6 is a conceptual perspective view schematically showing a nut gear and a ring gear of the link housing structure of the die casting machine according to the second embodiment.

  The link housing structure of the die casting machine according to the second embodiment is the same as the link housing structure of the die casting machine according to the first embodiment except for the ring gear 150.

  The ring gear 150 has a first ring gear portion 152 that meshes with four nut gears 120 (the other three nut gears 120 are omitted in FIG. 6), and a second ring gear portion 154 that meshes with the drive gear 126. is doing. The first ring gear portion 152 and the second ring gear portion 154 are overlapped and have the same inner diameter and the same gear diameter. A part of the outer periphery of the first ring gear part 152 is formed with a notch 156 cut out in a U-shape from the outer periphery, and the width of the notch 156 is the same as that of the notch 156. The length is such that the meshed state with the nut gear 120 can be released when the nut gear 120 is moved to a position facing the nut gear 120. That is, the notch 156 does not mesh with the nut gear 120 and is formed to have a length that allows the nut gear 120 to freely rotate. For example, the ring gear 122 is formed to have a width including at least one tooth of the ring gear 122 that contacts the first ring gear portion 152 and the nut gear 120 when they mesh with each other.

  In the link housing structure of the die casting machine according to the second embodiment, when adjusting the clamping force, the drive motor 124 is driven to rotate the drive gear 126 and the ring gear 150 is rotated. As a result, the nut gear 120 meshed with the first ring gear 152 rotates, and the tie bar 140 threadedly engaged with the nut gear 120 having a female screw formed inside thereof advances and retreats so that the mold clamping force can be adjusted. .

  When adjusting the load balance, the drive motor 124 is driven to move the notch portion 156 of the first ring gear portion 152 to a position facing the predetermined nut gear. As a result, the nut gear 120 is released from the meshing state with the ring gear 152, can freely rotate, and can adjust the load balance.

  In the second embodiment, only one cutout portion 156 is provided in the first ring gear portion 152, but a plurality of cutout portions 156 may be formed. For example, by forming a plurality of notches 156 at positions facing the nut gear 120, the meshed state of the plurality of nut gears 120 can be released simultaneously, and the plurality of nut gears 120 can be freely rotated simultaneously. Further, the ring gear 150 may form the first ring gear portion 152 and the second ring gear portion 154 by integrating two ring gears.

  As described above, in the first and second embodiments, the die casting machine has been described, but the present invention can also be applied to a link housing structure of another mold clamping device such as an injection molding machine.

It is a side view which shows roughly the nut gear and ring gear of the link housing structure of the die-casting machine which concern on 1st Embodiment. It is sectional drawing along the A-A 'line of FIG. (A) is a front view which shows the attachment / detachment member of a ring gear, (b) is a front view which shows the state from which the attachment / detachment member was removed from the ring gear. 3A is a cross-sectional view taken along line B-B ′ in FIG. 3A, and FIG. 3B is a cross-sectional view taken along line C-C ′ in FIG. (A) is a front view which shows the state which formed the notch part in the ring-shaped member, (b) is a front view of the attachment / detachment member before a process, (c) fits the attachment / detachment member before a process to a notch part The front view which shows the state which carried out, (d) is a front view which shows a ring gear. It is a conceptual perspective view which shows roughly the nut gear and ring gear of the link housing structure of the die-casting machine concerning 2nd Embodiment. It is a front sectional view showing a link housing structure of a conventional die casting machine. It is a side view which shows roughly the nut gear and ring gear of the link housing structure of the conventional die-casting machine. It is sectional drawing along the D-D 'line of FIG.

Explanation of symbols

104 Tie bar 116 Link housing 120 Nut gear 122 Ring gear 124 Die height motor 126 Drive gear 130 Detachable member 142 Notch

Claims (3)

A link of a mold clamping device used in a mold clamping device capable of adjusting the mold clamping force of a movable mold and a fixed mold by advancing and retracting a tie bar having a male thread on the surface relative to the link housing. In the housing structure,
A nut gear screwed to the tie bar, a ring gear meshed with the nut gear, and a drive means for moving the link housing by driving the nut gear via the ring gear,
The ring gear is configured so that a detachable member, which is a part of a portion engaged with the nut gear, is detachable, and at least one of the nut gears is free from the ring gear when the detachable member is detached from the ring gear. A link housing structure for a mold clamping device, characterized in that a notch is formed to enable proper rotation. A link of a mold clamping device used in a mold clamping device capable of adjusting the mold clamping force of a movable mold and a fixed mold by advancing and retracting a tie bar having a male thread on the surface relative to the link housing. In the housing structure,
A nut gear screwed to the tie bar, a ring gear meshed with the nut gear, and a drive means for moving the link housing by driving the nut gear via the ring gear,
The ring gear includes a first ring gear portion that meshes with the nut gear, and a second ring gear portion that meshes with a drive gear that is provided in the driving means and meshes with the ring gear, and the first ring gear portion includes A link housing structure for a mold clamping device, wherein a notch portion is formed to allow at least one of the nut gears to freely rotate with respect to the first ring gear portion. A method for manufacturing a ring gear used in the link housing structure of the mold clamping device according to claim 1,
A first step of forming the notch portion on which the detachable member is mounted on a peripheral surface of a ring-shaped member in which teeth are not formed on the peripheral surface;
A second step of forming a pre-process detachable member that is not formed with teeth on the peripheral surface and can be fitted into the notch;
And a third step of forming gear teeth on the outer peripheral surface of the ring-shaped member and the detachable member in a state where the pre-processing detachable member is fitted to the notch. Method.

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