JP2008023580A - Molding die set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding die set which prevent the wearing of light alloy-made dividing die pin inserting holes and also, even in the case of forming the hollow type dividing die, the rigidity and the strength of not only the dividing die but also the molding die can sufficiently be ensured. <P>SOLUTION: A lower die 2 (dividing die) where ejector pins 17 are inserted is constituted of the wall part 2d at a cavity side having a cavity constituting surface, the side wall part 2e and the bottom plate 2b (supporting plate) to form a hollow body. In the wall part 2d and the bottom plate 2b, the pin inserting holes 2c, 20a for inserting the ejector pins 17 are arranged at the opposite positions. The pin inserting holes 2c, 20a are connected in the hole space, and cylindrical wear-resistant sleeves 41 for inserting ejector pins 17 are arranged. The end parts at the wall part 2d side in the wear-resistant sleeves 41 are inserted into the pin inserting holes 2c and engaged and fixed and also, the end parts at the bottom plate 2b side is fixed to the bottom plate 2b. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a molding die device provided with an ejector pin for extruding a molded product formed in a cavity of a molding die constituted by a plurality of light alloy split dies, and belongs to the technical field of the die device. .

  The molding die apparatus has a molding die composed of a split die such as an upper die and a lower die, and an ejector unit, and is inserted into a plurality of pin insertion holes of the upper die and the lower die, and the tip is formed in the cavity. By moving a plurality of eject turbines provided facing the cavity to the cavity side, the molded product is detached from the upper mold and the lower mold.

  In this type of mold apparatus, in order to facilitate the changeover of the upper mold and the lower mold, it is desired to reduce the weight of these molds. For example, the upper mold and the lower mold are made of a light alloy. It is conceivable to configure. However, since a light alloy mold is inferior in wear resistance compared to, for example, an iron mold, the pin insertion hole is worn by sliding between the ejector pin and the mold, which may cause a molding failure. In order to cope with this, for example, in Patent Document 1, a wear-resistant member is embedded in the exit portion of a pin insertion hole of a light alloy mold, and the inner peripheral surface of the pin insertion hole and the outer periphery of the ejector pin It is configured such that the surface is not in direct contact with the surface, thereby preventing wear of the pin insertion hole.

JP-A-9-277010

  By the way, in order to further facilitate the changeover work, it is desired to further reduce the weight of the molding die. As a means for realizing this, it is considered that the split mold is made hollow by hollowing or the like. However, in this case, there is a problem that the rigidity and strength of the split mold are lowered.

  Therefore, the present invention prevents wear of the pin insertion hole of the light alloy split mold and ensures sufficient rigidity and strength of the split mold and thus the mold even when the split mold is hollow. It is an object of the present invention to provide a molding die apparatus that can perform the above process.

  In order to solve the above-described problems, the present invention is configured as follows.

  First, the invention described in claim 1 of the present application is a molding die apparatus provided with an ejector pin for extruding a molded product molded in a cavity of a molding die constituted by a plurality of light alloy split dies. The split mold into which the ejector pin is inserted is a hollow body, and includes a cavity-side wall portion having a cavity constituting surface, a side wall portion connected to the cavity-side wall portion, and the cavity-side wall. A support plate fixed to the edge of the side wall so as to block the hollow space, and the ejector pin is located at a position facing the wall on the cavity side and the support plate. Each of the pin insertion holes to be inserted is provided, the opposing pin insertion holes are connected in a hollow space, and the cylindrical wear-resistant sleeve member through which the ejector pin is inserted is provided. And the resistance The end of the wearable sleeve member on the wall side on the cavity side is inserted into and fixed to the pin insertion hole provided in the wall, and the end on the support plate side is fixed to the support plate. It is characterized by being.

  According to a second aspect of the present invention, in the molding die apparatus according to the first aspect, the split mold into which the ejector pin is inserted is made of duralumin, and the mold is filled with casting sand into the cavity. It is characterized by being molded.

  Further, the invention according to claim 3 is the molding die apparatus according to claim 1 or 2, wherein the molding die is composed of an upper die and a lower die as a split die, The upper die and the lower die are fixed with a first receiving member and a second receiving member that are in contact with each other when the die is clamped.

  According to a fourth aspect of the present invention, in the molding die apparatus according to the third aspect, the first receiving member has a guide function for setting the upper die, and the second receiving member is a lower portion. It has a guide function when setting a mold.

  Next, the effect of the present invention will be described.

  First, according to the invention described in claim 1, the split mold into which the ejector pin is inserted includes a cavity-side wall portion having a cavity constituting surface, and a sidewall portion connected to the cavity-side wall portion, It is composed of a support plate facing the cavity-side wall and fixed to the end edge of the side wall so as to close the hollow space. The entire device is reduced in weight.

  In that case, the cavity side wall and the support plate are provided with pin insertion holes through which the ejector pins are inserted at opposing positions, and the opposing pin insertion holes are arranged in a hollow space. The cylindrical wear-resistant sleeve that is connected and through which the ejector pin is inserted is provided, and the cavity-side end of the wear-resistant sleeve is provided on the wall. Since the end of the support plate is fixed to the support plate, the wear of the split type pin insertion hole through which the ejector pin is inserted is prevented. In addition, the rigidity and strength of the split mold, in particular, the cavity side wall portion having the cavity constituting surface is supported by the support plate via the wear-resistant sleeve, and the rigidity and strength of the wall portion are Strength is dramatic It can be improved.

  Further, according to the invention described in claim 2, the function and effect described in claim 1 can be obtained in the duralumin split mold in which the mold is formed by filling the cavity with foundry sand.

  According to a third aspect of the present invention, the molding die has an upper die and a lower die as divided dies, and the upper receiving portion and the lower die are in contact with each other when the die is clamped. Since the second receiving member is provided, the clamping load can be received by the contact between the first receiving member and the second receiving member, preventing deformation of the upper die and the lower die, and Durability can be improved.

  According to the invention of claim 4, the first receiving member has a guide function when setting the upper die, and the second receiving member has a guide function when setting the lower die. It becomes easy to set the upper mold and the lower mold.

  Hereinafter, a molding die apparatus according to an embodiment of the present invention will be described.

  FIG. 1 is a plan view of the lower mold 2 side of the molding apparatus 1 (only the front half of the apparatus is shown, and the rear half is substantially symmetrical with the near side), and FIG. It is A sectional drawing. The molding apparatus 1 includes a cavity X of a molding die M composed of a lower mold 2 and an upper mold 3, kneaded sand (corresponding to foundry sand) in which sand and a binder are mixed, and a predetermined curing gas (amine gas). ) And hardening the kneaded sand to form the engine port core. The molding apparatus 1 can set three sets in addition to the mold M, and a total of four sets of molds. In addition to the port core, a mold such as a side wall of the cylinder head can be used for one operation. It is configured to be simultaneously moldable in the cycle.

  As shown in FIGS. 1 and 2, the lower structure 4 for attaching and fixing the lower mold 2 includes a main body case 8, an ejector unit mounting portion 9, a drive mechanism 10 for driving the ejector unit 5, a lower mold mounting portion 11, A lower mold plate 12 that supports the lower mold 2 mounted on the lower mold mounting portion 11, a plurality of clamp mechanisms 13 to 13 that fix the lower mold 2 to the lower mold plate 12, and an ejector unit mounted on the ejector unit mounting portion 9 A lock bar 19 and the like for locking 5 are provided. An opening / closing plate 8 a is hinged to the left end surface of the main body case 8 at its lower end. 1 and FIG. 2 show a state in which the clamp mechanism 13... 13 is released, and the imaginary line is advanced and the wedge is advanced and fitted into the concave portion (shown by a dotted line) of the lower mold 2 to be clamped. It shows the state.

  The ejector unit 5 includes a main body plate 16 including an ejector plate 14 and an ejector plate presser plate 15 fixed to the lower surface of the ejector plate 14, and a plurality of ejectors standing on the main body plate 16 so as to protrude upward from the main body plate 16. Pins 17... 17 and a plurality of locking engagement pieces 18... 18 that protrude downward from the lower surface of the main body plate 16. After the ejector unit 5 is set on the ejector unit mounting portion 9, the ejector unit 5 is driven by the slide mechanism 19 by sliding it from the left to the right in FIG. (FIG. 2 shows a state of sliding to the right).

  A guide plate 20 made of a steel plate is attached to the ejector unit 5 so that it can be dressed. The guide plate 20 has a plurality of guide holes 20a 20a through which the plurality of ejector pins 17 ... 17 are inserted without rattling, and ejector unit mounting portions are provided at three positions apart from each other on the outer periphery of the guide plate 20. Positioned holding portions 20b... 20b for positioning the guide plate 20 mounted on the holding plate 9 at the three positioning holding portions 21... 21 formed on the lower mold plate 12 are integrally formed.

  In the state where the ejector unit 5 is set and fixed to the ejector unit mounting portion 9, the guide plate 20 has a plurality of guide plates 20 by restricting the position of the middle height of the ejector pins 17... 17 by the plurality of guide holes 20 a. The ejector pins 17... 17 are held in a vertical posture, and when the lower mold 2 is mounted on the lower mold mounting portion 11, the plurality of ejector pins 17 are inserted into the plurality of pin insertion holes 2 c. As will be described later, it can be smoothly inserted into the sleeves 41... 41 inserted through the insertion holes 2 c.

  The drive mechanism 10 includes an elevating plate 24 on which the main body plate 16 of the ejector unit 5 is placed and fixed, four return rods 25... 25 erected at four corners of the elevating plate 24, and the elevating plate 24. A plurality of leg members 26... 26 projecting from the lower surface, and a drive plate 28 on which the lower ends of the leg members 26... 26 are mounted and fixed to the upper ends of rods 27 of an ejector cylinder (not shown).

  The lower mold 2 is made of duralumin and is a box-shaped hollow body. The lower mold 2 is connected to the cavity-constituting wall 2d having a cavity-constituting surface and the cavity-constituting wall 2d. And a lower mold body 2a having a side wall portion 2e extending in a direction orthogonal to each other, and opposed to the cavity constituting wall portion 2d of the lower mold body 2a, and fixed to the end edge portion of the side wall portion 2e so as to block the hollow space. A bottom plate 2b made of light alloy. A plurality of pin insertion holes 2c... 2c... 2c, 2h... 2h for introducing the plurality of ejector pins 17. It is formed vertically. Here, as an example of the lower mold 2 duralumin material used in the present embodiment, the chemical components are 0.40% or less for Si, 0.50% or less for Fe, 1.2 to 2.0% for Cu, Mn is 0.30% or less, Mg is 2.1 to 0.9%, Zn is 5.1 to 6.1%, Cr is 0.18 to 0.28%, Ti + Zr is 0.25% or less, Ti Is 0.20% or less, Al remains, and mechanical properties are T651, tempering strength is 560 N / square mm, proof stress is 490 N / square mm, elongation is 12%, and Brinell hardness is 155 ( 10/500).

  Here, when the lower mold 2 is hollowed out, the rigidity and strength of the lower mold 2 are likely to be lowered. Therefore, as shown in FIG. 3, rib walls 2f... 2f for reinforcing the cavity constituting wall 2d and the like are formed vertically and horizontally on the surface of the cavity constituting wall 2d opposite to the cavity X. Further, as shown in FIG. 4, the pin insertion holes 2c, 2c, 2h, ... 2h facing each other are connected in the hollow space of the lower mold 2 between the bottom plate 2b and the cavity constituting wall 2d, Cylindrical sleeves 41... 41 through which the ejector pins 17. As shown in FIG. 5, a small-diameter portion 41a is formed at an end (upper end portion) on the cavity constituting wall 2d side of these sleeves 41 ... 41, and the small-diameter portion 41a is a pin of the cavity constituting wall 2d. The insertion holes 2c... 2c are inserted and fitted, and the lower end of the peripheral wall 2i of the pin insertion holes 2c... 2c and the stepped surface 41d of the sleeves 41. Further, the end (lower end) of the sleeve 41... 41 on the bottom plate 2b side is fitted and fixed to a recess 2j formed on the upper surface of the bottom plate 2b.

  Here, these sleeves 41... 41 prevent wear due to sliding with the ejector pins 17... 17 and wear due to sliding with foundry sand that has entered the sleeves 41. It is formed using a material. The material of the sleeve 41 used in the present embodiment will be described as an example. SKD61 in JIS, chemical components are 0.39% for C, 1.0% for Si, 0.65% for Mn, and 0.030 for P. %, S is 0.130%, Cr is 5.15%, Mo is 1.40%, V is 0.55%, Fe is remaining, and the mechanical properties are hardness 40 (HRC), The 0.2% proof stress is 1060 (MPa), the tensile strength is 1240 MPa, the elongation is 2%, and the drawing is 20%. The surface is subjected to nitriding treatment. On the other hand, the ejector pin 17 is JIS SK4 or SK3.

  A guide rod 35 is erected on the lower mold plate 12 through which the four return rods 25... 25 are slidably inserted. As shown in FIG. 1, the guide rod 35 has substantially the same shape as the left and right guide grooves 2g of the lower mold 2 in plan view. When the lower mold 2 is set from above, the guide groove 2g and the guide rod By engaging and lowering 35, it is set at a predetermined position. That is, the guide rod 35 has a guide function when setting the lower mold 2.

  Then, after the lower mold 2 is guided and set in the lower mold mounting portion 11 in this manner, the lower mold 2 is fixed to the lower mold plate 12 by a plurality of clamp mechanisms 13.

  The upper structure 6 for attaching and fixing the upper die 3 includes a thick plate-like upper die plate 31, a plurality of pairs of clamp mechanisms 32 for fixing the upper die 3 to the lower surface of the upper die plate 31, and the lower die 2 side. Four guide rods 33... 33 are provided at positions overlapping the four guide rods 35. At the time of clamping, the upper end surfaces 35a ... 35a of the four guide rods 35 ... 35 on the lower die 2 side and the lower end surfaces 33a ... 33a of the four guide rods 33 ... 33 on the upper die 3 side abut. Thus, the mold clamping load is received. These guide rods 33, like the guide rods 35 ... 35 on the lower mold 2 side, are substantially the same shape in plan view as the guide grooves (not shown) formed in the upper mold 2, and are engageable. It has a guide function for setting the upper mold 3. Further, on the upper end surface of the lower rod 2 side guide rods 35... 35, a positioning recess 35 b that can be engaged with a convex portion (not shown) provided at the lower end of the upper rod 3 side guide rods 33. Is formed. The upper structure 6 is connected to an upper mold lifting mechanism (not shown) of the molding apparatus 1 and is driven up a predetermined stroke at each timing of taking out the molded product.

  The upper mold 3 is made of duralumin, and includes an upper mold body 3a that forms a cavity X with the lower mold body 2a, and a light alloy bottom plate 3b that closes the upper end of the upper mold body 3a. In addition, although detailed description is abbreviate | omitted, this invention is applicable also to the upper mold | type 3. FIG.

  The molding apparatus 1 is provided with a blow head (not shown) that is movable up and down above the upper structure 6, and the probe head is provided on a tank for storing kneaded sand and a bottom plate of the tank. A plurality of attached probe nozzles N (shown in FIG. 2 through the insertion hole of the upper mold plate 31 through the phantom line and facing the cavity X), and a plurality of protrusions protruding downward on the bottom plate of the tank And a plurality of connecting members for connecting to a probe head moving mechanism (not shown).

  Further, the molding apparatus 1 is also provided with a molding unit (not shown) for filling the curing gas, and after the kneaded sand is filled into the cavity X by the blow head, the blow head is retracted, A molding unit is set there, and a curing gas (amine gas) is filled into the cavity X of the molding die M by the molding unit to cure the molded product. Thereafter, the lower mold 2 is changed to the upper mold 3. In parallel with the mold opening, the upper die ejector unit on the molding unit side is operated, and after the mold opening, the lower die side ejector unit 5 is actuated to release the molded product from the lower die 2 and carry it out.

  Here, a method for changing the forming mold M will be described. When the molding device M having the cavity X and the ejector unit 5 including the ejector pins 17... 17 are changed with respect to the molding apparatus 1, the following procedure is performed. In the initial preparation process, the guide plate 20 is mounted on the main body plate 16 of the ejector unit 5 with the plurality of ejector pins 17... 17 of the ejector unit 5 inserted through the plurality of guide holes 20 a. Prepare what you put in advance.

  A plurality of guide holes 20a... 20a are inserted into the guide plate 20 at positions corresponding to the plurality of ejector pins 17... 17 of the ejector unit 5 so that the corresponding ejector pins 17. In addition to being formed, the above-described three positioned holding portions 20b... 20b are formed in advance.

  Next, in the ejector unit setting step, the ejector unit 5 on which the guide plate 20 is placed is mounted on the ejector unit mounting portion 9 of the molding apparatus 1 and set in the drive mechanism 10, and the guide plate 20 is a lower mold holder. Positioned and held by the positioning holding portion 21 of the mold plate 12 and spaced apart from the main body plate 16 of the ejector unit 5 by a predetermined distance, the middle stages of the plurality of ejector pins 17... 17 through the plurality of guide holes 20 a. By restricting the height position, the plurality of ejector pins 17... 17 are held in a vertical posture by the plurality of guide holes 20 a.

  Next, in the lower mold setting process, the lower mold 2 is mounted on the lower mold mounting portion 11 while the lower mold 2 is supported by an operator by hand, and a plurality of pin insertion holes 2c. With the plurality of ejector pins 17... 17 inserted into the sleeves 41... 41 inserted into the insertion holes 2 c. The lower mold 2 is fixed to the lower mold plate 12 by the mechanism 13.

  Next, in the upper mold setting step, the upper mold 3 is set on the lower mold 2. Thereafter, the upper structure 6 is lowered, and the upper mold 3 is fixed to the lower surface of the upper mold plate 31 by the clamp mechanisms 32. In this way, when the changing of the molding die M is completed, the molding becomes possible.

  Next, the effect of this embodiment will be described.

  First, the lower mold 2 is opposed to the cavity constituting wall 2d on the cavity X side having the cavity face constituting surface, the side wall 2e connected to the cavity constituting wall 2d, and the cavity constituting wall 2d, Since it comprises a bottom plate 2b fixed to the end edge of the side wall 2e so as to close the hollow space and is a hollow body, the lower mold 2 and thus the molding apparatus 1 as a whole is reduced in weight.

  In that case, the cavity constituting wall 2d and the bottom plate 2b are provided with pin insertion holes 2c 2c 2c 2h 2h through which the ejector pins 17 17 are inserted at opposing positions. Pin insertion holes 2c ... 2c, 2h ... 2h are connected in a hollow space, and the cylindrical wear-resistant sleeves 41 ... 41 through which the ejector pins 17 ... 17 are inserted are provided, and The end portions of the wear-resistant sleeves 17 ... 17 on the cavity constituting wall 2d side are inserted into the pin insertion holes 2c ... 2c provided in the wall 2d and fixedly fitted, and the bottom plate 2b. Since the end on the side is fixed to the bottom plate 2b, it is possible to prevent wear of the pin insertion holes 2c... 2c of the lower mold 2 through which the ejector pins 17. Strength In particular, the cavity constituting wall 2d on the cavity X side having the cavity constituting surface is supported by the bottom plate 2b via the wear-resistant sleeves 41 ... 41, and the rigidity and strength of the wall 2d are dramatically improved. Will be.

  Since the lower end surface 33a of the guide rod 33 on the upper mold 3 side and the upper end surface 33a of the guide rod 35 on the lower mold 2 side are in contact with each other during mold clamping, the mold clamping load is applied to these members 33. , 35, the deformation of the duralumin mold can be prevented and the durability can be improved.

  Further, since the guide rod 33 has a guide function when setting the upper die 3, and the guide rod 35 has a guide function when setting the lower die 2, it is easy to set these die. Become.

  In the present embodiment, an example in which the present invention is applied to a molding apparatus that forms sand cores for intake ports using kneaded sand has been described. However, various metal or synthetic resin moldings other than sand cores have been described. The present invention can be similarly applied to a molding apparatus for molding a product.

  The present invention can be widely applied to a molding die apparatus provided with an ejector pin for extruding a molded product molded in a cavity of a molding die constituted by a plurality of light alloy split dies.

It is a top view of the lower mold | type of the shaping die apparatus which concerns on embodiment of this invention. It is AA sectional drawing of FIG. It is a bottom view of a lower mold body. It is an enlarged view of the left side part in FIG. It is an enlarged view of the B part of FIG.

Explanation of symbols

1 Molding device (molding die device)
2 Lower mold (split type, split type into which ejector pins are inserted)
2b Bottom plate (support plate)
2c ... 2c Pin insertion hole 2d Cavity constituting wall (cavity side wall having a cavity constituting surface)
2e Side wall part 3 Upper mold (split type)
17 ... 17 Ejector pin 33 ... 33 Guide rod (first receiving member)
35 ... 35 Guide rod (second receiving member)
41 ... 41 Wear-resistant sleeve X Cavity

Claims (4)

A molding die apparatus provided with an ejector pin for extruding a molded product molded in a cavity of a molding die composed of a plurality of light alloy split dies,
The split mold through which the ejector pin is inserted is a hollow body, and is opposed to the cavity-side wall having the cavity constituting surface, the side wall connected to the cavity-side wall, and the cavity-side wall. And a support plate fixed so as to close the hollow space at the edge of the side wall,
The cavity side wall and the support plate are provided with pin insertion holes through which the ejector pins are inserted at opposing positions, respectively.
Opposite pin insertion holes are connected in a hollow space, and the cylindrical wear-resistant sleeve into which the ejector pin is inserted is provided, and the cavity-side wall portion side of the wear-resistant sleeve is provided. A molding die apparatus characterized in that an end portion is inserted into and fixed to the pin insertion hole provided in the wall portion, and an end portion on the support plate side is fixed to the support plate. . In the molding die apparatus according to claim 1,
A mold part for inserting the ejector pin is made of duralumin, and a mold is formed by filling a cavity with casting sand. In the molding die apparatus according to claim 1 or 2,
The molding die has an upper mold and a lower mold as a split mold,
An upper die and a lower die are provided with a first receiving member and a second receiving member that come into contact with each other when the die is clamped. In the molding die apparatus according to claim 3,
The molding apparatus according to claim 1, wherein the first receiving member has a guide function when an upper mold is set, and the second receiving member has a guide function when a lower mold is set.

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