JP3178041U - Mold positioning device for molding machine - Google Patents

Abstract

Disclosed is a mold positioning device for a molding machine, which enables molds of different sizes to be centered with respect to a mold mounting plate, and suppresses the manufacturing costs of the mold and the mold positioning device.
A base member 11 fixed in the vicinity of a lower end of a board surface, a mold receiving member 12 on which a mold can be placed, an air cylinder 13 for moving the mold receiving member 12 up and down relative to the base member 11, A centering member 20 is provided for receiving the fixing flange portion of the mold and centering the mold with respect to the board surface. A plurality of pin holes 12a to 12d arranged in parallel and at equal intervals to the board surface are provided in the mold receiving member 12, and the centering member 20 is capable of receiving the fixing flange portion of the mold, The locking portion 21 includes insertion pin portions 22 and 23 that extend downward from the lower end and can be inserted into pin holes selected from the plurality of pin holes 12a to 12d.
[Selection] Figure 3

Description

  The present invention relates to a mold positioning apparatus for a molding machine that positions to fix a plurality of types of molds having different sizes on a surface of a mold mounting plate of the molding machine, and in particular, can receive a fixing flange portion of the mold. The present invention relates to a mold positioning device for a molding machine provided with a centering member having a locking portion and an insertion pin portion.

  Conventionally, in an injection molding machine, a mold is fixed to a vertical panel surface formed on a pair of platens that are mold mounting plates, and the movable plate is driven in a direction approaching or separating from the fixed platen. The mold is closed and opened. Molten synthetic resin is supplied to the cavity in the closed mold by an injection mechanism, and the molten synthetic resin is cured to form a molded product. After the mold is opened, the molded product is ejected. Ejected from the mold by the mechanism.

  When exchanging molds in an injection molding machine, it is necessary to center and fix a newly set mold on the surface of a pair of platens so that an injection mechanism, an ejector mechanism, and the like function normally. In general, a locating ring is formed in the fixed mold, and the locating ring engages with a fitting recess at an end of a nozzle insertion hole formed in the fixed platen, so that the mold is centered. Each of the fixed mold and the movable mold has a mold main body that forms a cavity and a fixing flange portion to which the mold main body is fixed. The fixing flange portion abuts on the platen surface of the platen. Fixed in shape.

  A mold positioning device for a molding machine disclosed in Patent Document 1 includes a base member fixed in the vicinity of a lower end of a board surface, a mold receiving member that is disposed above the base member and on which a mold can be placed, and a mold receiving member And a raising / lowering drive mechanism for moving the die up and down with respect to the base member, and a positioning convex portion for positioning the fixing flange portion of the mold in a direction parallel to the surface of the mold is located at the upper center of the mold receiving member. It is provided to protrude. As a result, when the lower end of the mold is supported by the mold receiving member, the positioning convex portion and the positioning concave portion formed in the central portion of the lower end of the fixing flange portion are fitted, and the mold is parallel to the board surface and Centered horizontally.

JP 2012-86492 A

In the mold positioning device of the molding machine disclosed in Patent Document 1, when the currently set mold is replaced with another mold, the mold is placed on the platen surface by fitting the positioning projection and the positioning recess. On the other hand, it can be centered in the parallel direction.
However, in the mold positioning device disclosed in Patent Document 1, it is necessary to previously form a positioning recess that can be fitted to the positioning protrusion of the mold receiving member in the fixing flange of the mold. May increase. Moreover, since the combination of the mold positioning device (positioning convex portion) and the mold (positioning concave portion) is inevitably limited by the fitting shape of both, a mold positioning device having a positioning convex portion of a predetermined shape is provided. When used, it is difficult to center a mold in which a positioning recess having a shape different from that of the positioning protrusion is formed, and there is a problem in terms of effective use of production equipment and versatility.

Instead of positioning protrusions that can be fitted into the positioning recesses of the mold, a centering member that receives the end of the mold fixing flange is provided at the end of the mold receiving member of the mold positioning device. It is also conceivable to center the mold by receiving and locking the fixing flange portion of the loaded mold to the centering member. Thereby, it becomes possible to omit the positioning concave portion of the fixing flange portion of the mold and the positioning convex portion of the mold receiving member.
However, the mold specifications vary depending on the size and shape of the molded product. In order to center multiple types of molds with different specifications using the mold receiving member as described above, the plurality of molds must be fixed. It is necessary to standardize the fixing flange by unifying the size of the flange. In other words, even if the mold can be reduced in size according to the size of the molded product, it is necessary to provide a fixed flange part of the same size that is standardized larger than necessary. As a result, the size of the mold receiving member and the like increases, resulting in an increase in the weight of the mold, an increase in the work load of the mold replacement, and an increase in the manufacturing cost of the mold.

  An object of the present invention is to provide a mold positioning device for a molding machine and the like that can suppress the manufacturing costs of the mold and the mold positioning device while allowing the molds of different sizes to be centered with respect to the mold mounting plate. That is.

  The mold positioning device according to claim 1 is a mold positioning device for a molding machine that performs positioning in order to selectively fix a plurality of types of molds having different sizes to a board surface of a mold mounting board of the molding machine. A base member fixed in the vicinity of the lower end of the base member, a mold receiving member that is disposed above the base member and on which a mold can be placed, and a lift drive that moves the mold receiving member up and down relative to the base member A plurality of pin holes for detachably mounting the centering member, comprising a mechanism and a centering member for receiving the fixing flange portion of the mold and centering the mold horizontally with respect to the panel surface In the mold receiving member, a plurality of pin holes arranged in parallel and equidistant to the board surface are provided, and the centering member can receive the fixing flange portion of the mold. A stop portion, and comprising the insertable insertion pin portion to a selected pin holes of the engaging portion lower end extending from the downwardly and the plurality of pin holes of.

The invention of claim 2 is characterized in that, in the invention of claim 1, the centering member comprises a single insertion pin portion and a cylindrical locking portion coaxial with the insertion pin portion.
The invention of claim 3 is characterized in that, in the invention of claim 1, the centering member comprises a rectangular parallelepiped locking portion and one or a plurality of insertion pin portions extending downward from the locking portion. Yes.

  The invention of claim 4 is the invention of any one of claims 1 to 3, wherein the support member is disposed between the mold receiving member and the base member and supports the mold receiving member to the base member. It is characterized by providing a plurality of types according to the size of the mold.

  According to the first aspect of the present invention, since the engaging portion of the centering member can receive the fixing flange portion from the end in the direction parallel to the board surface, the centering recess or the like is processed on the mold. Without any problem, the mold can be centered with respect to the mold mounting board. In addition, since the insertion pin portion connected to the locking portion is detachable with respect to the plurality of pin holes, the pin hole corresponding to the size of the mold to be centered is selected from the plurality of pin holes. The insertion pin portion can be easily attached to the selected pin hole, and the locking portion can be efficiently arranged with respect to the mold receiving member. Therefore, it is possible to suppress the manufacturing costs of the mold and the mold positioning device while making it possible to center the molds having different sizes with respect to the mold mounting board.

According to the second aspect of the invention, the structure of the centering member can be simplified, and dies having the same number of types as the number of pin holes can be centered.
According to the invention of claim 3, since the fixing flange portion can be received by the surface of the locking portion and the support rigidity of the centering member can be increased, the centering accuracy of the mold can be increased.

  According to the fourth aspect of the present invention, since the lifting drive mechanism only needs to have a supporting strength capable of lifting the mold receiving member, the lifting drive mechanism can be made lightweight and compact with a simple configuration, and a heavy metal mold can be reliably secured. Can be supported.

1 is a side view of an injection molding machine, a mold positioning device, and a mold according to Embodiment 1. FIG. It is the II-II sectional view taken on the line of FIG. It is a disassembled perspective view of a stationary platen side mold positioning device. (A) is a side view of a centering member, (b) is a bottom view of the centering member. It is a front view of the fixed platen side mold positioning device when the centering member is mounted in the second mounting form. It is a front view of the fixed plate | board side metal mold | positioning apparatus when a centering member is mounted | worn with a 3rd mounting form. (A) is a perspective view of the centering member based on Example 2, (b) is the side view, (c) is the bottom view. 6 is a perspective view of a centering member according to Embodiment 3. FIG.

  Hereinafter, embodiments of the present invention will be described based on examples. 1 and FIG. 2, the arrow F is the front, the arrow B is the rear, the arrow L is the left, and the arrow R is the right.

  As shown in FIGS. 1 and 2, the injection molding machine 1 includes a pair of opposed platens 2 and 3 (movable with a fixed platen 2) to which a mold M (a fixed mold M <b> 1 and a movable mold M <b> 2) is fixed. A plate 3), four guide rods 4 for guiding and supporting the movable plate 3 so as to move toward and away from the fixed plate 2 in order to close and open the mold M, and the movable plate 3 An injection mechanism having a platen drive mechanism 5 having a hydraulic cylinder (or drive motor) driven in the approaching / separating direction and an injection cylinder 6a for supplying molten synthetic resin to the cavity in the mold M which is closed. 6 and a pair of mold positioning devices 7 and 8 for positioning when the mold M is fixed to the vertical plate surfaces 2a and 3a of the pair of platens 2 and 3, and a movable mold M2 of the mold M. An ejector device 9 for ejecting the product is provided.

  As shown in FIG. 1, the fixed mold M1 and the movable mold M2 include mold main bodies M1a and M2a that form cavities, and fixing flange portions M1b and M2b to which the mold main bodies M1a and M2a are fixed, respectively. Have A locating ring M1c is formed on the fixing flange portion M1b of the fixed mold M1, and the locating ring M1c is fitted into a fitting recess at the end of the nozzle insertion hole 2b of the injection mechanism 6 formed on the stationary platen 2. The mold M is in a centered state. After the centering of the mold M, the fixing flange M1b of the fixed mold M1 is fixed to the board surface 2a of the fixed board 2 by a plurality of clamping devices (not shown) to fix the movable mold M2. The flange portion M2b is fixed to the board surface 3a of the movable board 3 by a plurality of clamping devices (not shown) in contact with the board surface 3a. A plurality of types of molds MA and MB having different sizes can be alternatively attached to and detached from the board surfaces 2a and 3a of the pair of platens 2 and 3.

  When injection molding is performed by the injection molding machine 1, the movable platen 3 is driven in the direction in which the movable platen 3 approaches the fixed platen 2, and the movable die M2 is pressed against the fixed die M1 as shown in FIG. Then, the mold M is closed, and in this state, the molten synthetic resin is supplied from the tip of the injection cylinder 6a to the cavity in the mold M by the injection mechanism 6, and the molten synthetic resin is cured. The molded product is then molded. Thereafter, the movable platen 3 is driven by the platen drive mechanism 5 in a direction away from the fixed platen 2, the movable mold M2 is separated from the fixed mold M1, and the mold M is in an open state. In this state, the ejector The molded product is ejected from the movable mold M2 by the device 9.

Next, the mold positioning device 7 will be described.
As shown in FIGS. 1 to 3, the mold positioning device 7 includes a base member 11, a mold receiving member 12, an air cylinder 13 (elevating drive mechanism), a pair of left and right support members 14, and a centering member 20. Etc. The mold positioning device 7 is mounted on the fixed platen 2, and the base member 11 is arranged and fixed in the vicinity of the lower end of the platen surface 2 a of the fixed platen 2, and protrudes from the platen surface 2 a to the movable platen 3 side. Are firmly fixed by a plurality of bolts 10.
Since the pair of mold positioning devices 7 and 8 have the same configuration, the mold positioning device 7 mounted on the stationary platen 2 will be mainly described below, and the description of the mold positioning device 8 will be omitted. However, the plurality of constituent members of the mold positioning device 8 are illustrated with the same reference numerals as the plurality of constituent members of the mold positioning device 7.

  The base member 11 and the mold receiving member 14 are each formed of an elongated rectangular bar member made of metal that extends in the left-right direction along the board surface 2 a of the fixed platen 2, and is slightly smaller than the interval between the two lower guide rods 4. Has a short left and right length. The base member 11 is formed with a rod insertion hole 11a penetrating vertically at the center position, and the piston rod 13a of the air cylinder 13 is inserted into the rod insertion hole 11a.

  As shown in FIG. 3, the mold receiving member 12 is arranged above the base member 11 so that the mold M1 can be placed, and a plurality of, for example, four pin holes 12a to 12d are arranged in order from the left on the left side portion. Is provided. The four pin holes 12a to 12d are configured such that the centering member 20 is detachable, and holes having the same diameter are recessed so as to have a predetermined depth downward from the upper surface of the mold receiving member 12.

  These pin holes 12a to 12d are arranged parallel to the plate surface 2a of the fixed platen 2 and at equal intervals, for example, 50 mm intervals, and the first mounting form in which the centering member 20 is supported by the pin holes 12a and 12b, and the pin holes Either of the second mounting configuration in which the centering member 20 is supported by 12b and 12c and the third mounting configuration in which the centering member 20 is supported by the pin holes 12c and 12d can be selected. The first mounting form is a mounting form when the mold M is centered with respect to the board surface 2a (nozzle insertion hole 2b), and the second mounting form is a mold MA having a smaller size than the mold M. The third mounting mode is a mounting mode when centering the mold MB smaller in size than the mold MA with respect to the board surface 2a.

  As shown in FIGS. 1 to 3, the air cylinder 13 includes a cylinder member 13b, a piston (not shown) that can slide inside the cylinder member 13b, a piston rod 13a connected to the piston, and a cylinder member. 21, ports 13 c and 13 d through which air can be supplied and discharged, a position detection sensor 15 a that can detect the upper limit position of the piston corresponding to the upper limit position (first mounting form) of the mold receiving member 12, and the mold receiving member 12 The position detection sensor 15b that can detect the intermediate position of the piston corresponding to the intermediate position (second mounting form) and the lower limit position of the piston that corresponds to the lower limit position (third mounting form) of the mold receiving member 12 can be detected. A position detection sensor 15c and the like are provided. The air cylinder 13 drives the mold receiving member 12 up and down along the board surface 2a by the forward and backward movement of the piston rod 13a.

The air cylinder 13 is disposed in an upright posture below the central portion of the base member 11 in the left-right direction so as to extend downward from the lower portion of the base member 11. In the air cylinder 13, the upper end portion of the cylinder member 13 b is attached to the lower end portion of the base member 11, and the upper end portion of the piston rod 13 a passing through the rod insertion hole 11 a is connected to the lower portion of the mold receiving member 12.
When the mold receiving member 12 is raised by the air cylinder 13, the piston rod 13a is advanced, and when the position detection sensor 15a detects that the piston has reached the upper limit position, the upward movement is stopped. When the mold receiving member 12 is lowered by the air cylinder 13, the piston rod 13a is retracted, and the downward movement is stopped when the position detection sensor 15b detects that the piston has reached the lower limit position.

  The position detection sensor is not limited to the three sensors that detect the upper limit position, the intermediate position, and the lower limit position, but three or more positions according to the number of mounting forms corresponding to the number of mold types to be replaced. A detection sensor can be provided. A detection member integrally connected to the piston rod 13a may be separately provided, and a plurality of height positions of the mold receiving member 12 may be detected by a sensor that detects movement of the detection member at a plurality of positions.

As shown in FIGS. 1 to 3, the pair of left and right support members 14 are each formed in a rectangular parallelepiped shape having six planes of front, rear, left, right, and upper, and have a support rigidity on which the mold M1 can be placed. ing.
These support members 14 are configured to be arranged in a state of being sandwiched between the base member 11 and the mold receiving member 12 when in the first mounting form, and the length of one side in the vertical direction of the four front, rear, left and right surfaces. Is set to be equal to the separation distance between the upper surface of the base member 11 and the lower surface of the mold receiving member 12 in the first mounting configuration.

As shown in FIGS. 5 and 6, in addition to the pair of support members 14 corresponding to the first mounting form, the base in the case where the length of one side in the vertical direction of the four front, rear, left and right surfaces is the second mounting form. A pair of left and right support members 14A set to be equal to the separation distance between the upper surface of the member 11 and the lower surface of the mold receiving member 12, and the length of one side in the vertical direction of the four front, rear, left and right surfaces is the third mounting. A pair of left and right support members 14B set to be equal to the distance between the upper surface of the base member 11 and the lower surface of the mold receiving member 12 in the form are separately prepared.
The vertical length of the support member 14A is longer than that of the support member 14, and the vertical length of the support member 14B is set longer than that of the support member 14A.

  As shown in FIG. 2, when the centering member 20 is in the first mounting form, the lower end portion of the left end surface of the fixing flange portion M1b of the mold M1 is received by the centering member 20 fixed to the panel surface 2a to receive the mold M1. It can be centered in the horizontal direction. As shown in FIGS. 3, 4 (a), and 4 (b), the centering member 20 includes a locking portion 21 that can receive the fixing flange portion M <b> 1 b in a contact state, and a lower end of the locking portion 21. And a pair of insertion pin portions 22 and 23 that can be inserted into pin holes 12a and 12b selected from among the plurality of pin holes 12a to 12d, respectively.

The locking part 21 is configured in a rectangular parallelepiped shape having six planes of front, rear, left, right and up.
The insertion pin portions 22 and 23 are provided at a distance of 50 mm similarly to the interval between the pin holes 12a to 12d, and are provided at an equal distance, for example, 25 mm from the left end surface 21a and the right end surface 21b. The axial lengths of the insertion pin portions 22 and 23 are set to be slightly shorter than the depth of the pin holes 12a to 12d, and when the insertion pin portions 22 and 23 are inserted into the pin holes 12a to 12d, The lower surface 21c of the stopper 21 and the upper surface of the mold receiving member 12 are in close contact with each other.

Next, an operation procedure for fixing the mold M1 (M) to the board surface 2a will be described.
First, the insertion pin portions 22 and 23 are inserted into the pin holes 12a and 12b, respectively, and the centering member 20 is attached to the mold receiving member 12 in the first attachment form.
The mold receiving member 12 is moved to the lower limit position by the air cylinder 13, and a pair of support members 14 are arranged in the vicinity of the left and right ends between the base member 11 and the mold receiving member 12, respectively. Support members 14 are sandwiched between the lower surface of the receiving member 12. Thereby, the load acting on the mold receiving member 12 is transmitted to the base member 11 via the pair of support members 14 and supported by the stationary platen 2.

  The mold receiving member 12 is configured such that the lower end portion of the left end surface of the fixing flange portion M1b contacts the right end surface 21b of the locking portion 21 of the centering member 20 in surface contact with the mold M1 carried in by the crane or the loading carriage. Position on top. Accordingly, the mold M1 is positioned in the vertical direction by the mold receiving member 12, and is positioned in the horizontal direction by the centering member 20, so that the center of the locating ring M1c and the nozzle insertion hole 2b is in the centering state. It is fixed to the board surface 2a.

A case where a mold MA having a smaller size than the mold M is fixed to the board surface 2a will be described.
The insertion pin portions 22 and 23 are inserted into the pin holes 12b and 12c, respectively, and the centering member 20 is attached to the mold receiving member 12 in the second attachment form. As shown in FIG. 5, the mold receiving member 12 is moved to an intermediate position by the air cylinder 13, and a pair of support members 14 </ b> A are arranged between the base member 11 and the mold receiving member 12, respectively. And a lower surface of the mold receiving member 12 are sandwiched between the supporting members 14A. The mold MA is centered by positioning the mold MA on the mold receiving member 12 so that the lower end portion of the left end surface of the fixing flange portion is in contact with the right end surface 21b of the locking portion 21 of the centering member 20. To fix to the board surface 2a.

The case where the mold MB having a smaller size than the mold MA is fixed to the board surface 2a will be described.
The insertion pin portions 22 and 23 are inserted into the pin holes 12c and 12d, respectively, and the centering member 20 is attached to the mold receiving member 12 in the second attachment form. As shown in FIG. 6, the mold receiving member 12 is moved to the upper limit position by the air cylinder 13, and a pair of support members 14 </ b> B are arranged between the base member 11 and the mold receiving member 12, respectively. And the lower surface of the mold receiving member 12 are sandwiched between the support members 14B. The mold MB is centered by positioning the mold MB on the mold receiving member 12 so that the lower end portion of the left end surface of the fixing flange portion is in contact with the right end surface 21b of the engaging portion 21 of the centering member 20. To fix to the board surface 2a.

Next, the operation and effect of the mold positioning device 7 will be described.
Since the lower end portion of the left end surface of the fixing flange portion M1b can be received and centered in the horizontal direction by the engaging portion 21 of the centering member 20, the mold M1 can be formed without forming a centering recess or the like in the mold M1. Can be centered with respect to the stationary platen 2. Moreover, since the insertion pin portions 22 and 23 fixed to the locking portion 21 are detachable from the plurality of pin holes 12a to 12d, the size of the mold M1 to be centered from the plurality of pin holes 12a to 12d. Pin holes 12a and 12b can be selected according to the number of pin holes 12a and 12b, and the insertion pin portions 22 and 23 can be easily mounted in the selected pin holes 12a and 12b. Can be arranged. Therefore, even if the dies M, MA, and MB having different sizes can be centered with respect to the stationary platen 2, the manufacturing costs of the dies M, MA, and MB and the die positioning device 7 can be suppressed. Can do.

  Since the centering member 20 includes a rectangular parallelepiped locking portion 21 and a pair of insertion pin portions 22 and 23, the fixing flange portion M1b is received by the right end surface 21b of the locking portion 2 in the horizontal direction. The centering can be performed, the support rigidity of the centering member 20 can be increased, and the centering accuracy of the mold M1 can be increased.

  A plurality of types of support members 14, 14 A, and 14 B that are disposed between the mold receiving member 12 and the base member 11 and support the mold receiving member 12 on the base member 11 are provided according to the sizes of the molds M, MA, and MB. Therefore, it is only necessary that the air cylinder 13 has a support capability capable of moving the mold receiving member 12 up and down, and a large-sized mold M can be formed by the mold receiving member 12 while the air cylinder 13 having a small and compact configuration can be adopted. , MA, MB can be reliably supported.

A centering member 20A according to the second embodiment will be described with reference to FIG. The same main components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different components are described.
In the first embodiment, the insertion pin portions 22 and 23 are symmetrically arranged so as to be equidistant from the left and right ends of the locking portion 21, but in the second embodiment, the insertion pin portions 25 and 26 are connected to the locking portion 24. They are arranged at different distances from the left and right ends.

As shown in FIGS. 7A to 7C, the locking portion 24 is configured in a rectangular parallelepiped shape including six planes of front, rear, left, right, and upper and lower.
The insertion pin portions 25 and 26 are provided at a distance of 50 mm, similarly to the interval between the pin holes 12a to 12d. The insertion pin portion 25 is disposed so as to be separated from the left surface 24a of the locking portion 24 by, for example, 12.5 mm, and the insertion pin portion 26 is disposed so as to be separated from the right surface 24b of the locking portion 24, for example, by 25 mm.

  Thus, when the centering member 20A is mounted in any one of the pin holes 12a to 12d so that the right end surface 24b receives the lower end portion of the left end surface of the fixing flange portion M1b, three sizes of gold are used as in the first embodiment. The types M, MA and MB can be centered. In addition, when the centering member 20A is mounted in any one of the pin holes 12a to 12d so that the left and right sides of the centering member 20A are reversed and the left end surface 24a receives the lower end portion of the left end surface of the fixing flange portion M1b, In addition to the different sizes, three different sizes can be centered. Therefore, the centering member 20A can center six sizes of molds by changing the mounting form of the pin holes 12a to 12d.

Next, the centering member 20B of Example 3 will be described with reference to FIG. The same main components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different components are described.
In the first embodiment, the centering member 20 is mounted by a pair of insertion pin portions 22 and 23, but in the second embodiment, the centering member 20B is mounted by a single insertion pin portion 28.

  The centering member 20B includes an insertion pin portion 28 and a cylindrical locking portion 27 that is integrally formed at the upper end of the insertion pin portion 28 and that has a larger diameter than the insertion pin portion 28 and is coaxial. 28 extends downward from the lower end of the cylindrical locking portion 27. Since the insertion pin portion 28 can be selectively attached to any one of the pin holes 12a to 12d, the centering member 20B can center the molds of the same four types as the number of the pin holes 12a to 12d. Is possible.

Next, a modification in which the above embodiment is partially changed will be described.
1) In the above embodiment, an example in which a pair of support members are disposed between the base member and the mold receiving member after the centering member is mounted on the mold receiving member has been described. Even if the centering member is attached to the mold receiving member after the base member is disposed between the base member and the mold receiving member, the same effect can be obtained. Moreover, although the example which arrange | positions a pair of supporting member between a base member and a type | mold receiving member was demonstrated, one supporting member may be sufficient and you may use three or more.

2] In the first and second embodiments, an example of a pair of insertion pin portions extending downward from the lower end of the cubic locking portion has been described. However, a single insertion pin portion may be used, and three or more insertion pin portions may be provided. The insertion pin portion may be used. When the number of insertion pin portions is one, it is possible to center a mold of the same type as the number of pin holes. Further, the example of the insertion pin portion having a circular cross section has been described. However, for example, an insertion pin portion having a rectangular cross section other than the circular shape may be used. In particular, in the case of one insertion pin portion, even if the same pin hole is used. The size of the mold that can be centered can be increased by adopting a mounting form in which the insertion pin portion is rotated around the axis.

3) In the above embodiment, an example in which a plurality of pin holes are provided on the left side portion of the mold receiving member has been described. However, it may be provided on the right side portion of the mold receiving member, or on both sides of the left side portion and the right side portion. It is also possible to provide it. When providing a plurality of pin holes on the left and right sides of the mold receiving member, for example, use a plurality of pin holes on the left side for small molds and a plurality of pin holes on the right side for medium and large molds. The number of molds that can be centered can be increased by using.

4] It should be noted that those skilled in the art can implement the present invention with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. is there.

  The present invention provides a mold positioning device for a molding machine that centers a mold in order to fix a plurality of types of molds having different sizes to a surface of a mold mounting plate of the molding machine.

DESCRIPTION OF SYMBOLS 1 Injection molding machine 2 (Fixed side) Platen 2a (Fixed side) Board surface 7 (Fixed side) Mold positioning device 11 Base member 12 Mold receiving members 12a-12d Pin hole 13 Air cylinders 14, 14A, 14B Support members 20, 20A , 20B Centering member 21 Locking part 22, 23 Insertion pin part 24 Locking part 25, 26 Insertion pin part 27 Cylindrical locking part 28 Insertion pin part M, MA, MB Mold

Claims (4)

In a mold positioning device of a molding machine that positions to selectively fix a plurality of types of molds of different sizes to the surface of the mold mounting plate of the molding machine,
A base member fixed to the vicinity of the lower end of the board surface;
A mold receiving member disposed above the base member and capable of placing a mold;
A lifting drive mechanism for moving the mold receiving member up and down relative to the base member;
A centering member for receiving the fixing flange portion of the mold and centering the mold horizontally with respect to the panel surface;
A plurality of pin holes for detachably mounting the centering member, wherein the mold receiving member is provided with a plurality of pin holes arranged in parallel and at equal intervals to the board surface;
The centering member is capable of receiving a fixing flange portion of the mold, and extends downward from a lower end of the locking portion and can be inserted into a selected pin hole among the plurality of pin holes. A mold positioning apparatus for a molding machine, comprising an insertion pin portion.   2. The mold positioning device for a molding machine according to claim 1, wherein the centering member includes a single insertion pin portion and a cylindrical locking portion coaxial with the insertion pin portion.   2. The mold positioning device for a molding machine according to claim 1, wherein the centering member includes a rectangular parallelepiped locking portion and one or a plurality of insertion pin portions extending downward from the locking portion. .   4. A plurality of types of support members arranged between the mold receiving member and the base member and supporting the mold receiving member on the base member are provided according to the size of the mold. The mold positioning device for a molding machine according to any one of the above.