JPH08300128A - Pressure device of slide core - Google Patents

Abstract

PURPOSE: To provide a pressure device of a slide core capable of preventing the generation of defects of a formed body, and forming the formed body of excellent quality without increasing the size of the slide core. CONSTITUTION: A cylinder rod 22 is fixed to a movable main die 3, and a pressure pin 8 is fixed to a cylinder sleeve 21. The pressure pin 8 is extended in the horizontal direction, and slidably held by a slide holder 6 and a slide core 7. A projected part 21b is projectingly provided on the upper surface of the cylinder sleeve 21, and a recessed part 6a is recessed in the bottom surface of the slide holder 6. The projected part 21b is abutted on the recessed part 6a by contracting the cylinder rod 22, and the pressure pin 8 is projected in a cavity C in a delayed manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressurizing device for a slide core used in a molding die such as casting.

[0002]

2. Description of the Related Art For example, when casting a cast product, a fixed die, a movable die vertically movable relative to the fixed die, and a slide core horizontally movable relative to the movable die. A molding die having a is used. In this molding die, a cavity is defined by a fixed die, a movable die and a slide core, and a cast product is cast by the molten metal poured into the cavity.

Here, when the cast product has a complicated shape in which a thin portion and a thick portion such as a functional boss are adjacent to each other, especially due to shrinkage of the molten metal in the thick portion as the solidification progresses. Internal defects such as shrinkage cavities are likely to occur. Therefore, in order to prevent the occurrence of such internal defects, a pressure pin protruding into the cavity may be provided in the slide core, and the pressure pin may be used to perform local pressure.

As a pressurizing device for a slide core, which is used in a molding die of this type, to close and open the slide core and to allow the pressurizing pin to project into the cavity, the actual open flat 1-68152. The one described in Japanese Patent Publication is known. In this slide core pressurizing device, a cylinder sleeve is fixed to a movable type, and a cylinder rod can be extended or shortened in the horizontal direction with respect to the cylinder sleeve. A slide holder is slidably held on the protruding portion of the cylinder rod, and a slide core is fixed to the slide holder. A restriction hole is formed in the slide core, and a pressure pin is fixed to the tip of the cylinder rod in the restriction hole via a pressure plate.

In such a slide core pressurizing device, the slide core can be closed or opened by extending or shortening the cylinder rod, and the cylinder rod can be further extended when the molten metal is solidified. The pin is delayed and projected into the cavity to locally pressurize, whereby it is possible to prevent the occurrence of defects such as shrinkage cavities of the cast product due to contraction of the molten metal during solidification.

[0006]

However, in the above-mentioned conventional pressurizing device for the slide core, a restriction hole is provided in the slide core in order to delay and protrude the pressurizing pin into the cavity. A pressure plate is movably provided on the.
Therefore, in this slide core pressing device, the slide core of the molding die becomes large. In particular, since such a slide core constitutes a part of the cavity, it may have a water cooling pipe or the like built therein, and in this case, the slide core becomes further large. When the slide core becomes large in size, the equipment becomes large and heavy, and the molding cost rises due to the expansion of the space in the factory, the limitation of the installation position, and the like. Further, since such a slide core is for molding a molded product such as a cast product, it is relatively expensive, and if the slide core becomes large in size, it becomes more expensive and the molding cost also rises. .

The present invention has been made in view of the above-mentioned conventional circumstances, and prevents the occurrence of defects in the molded product without causing the slide core to become large in size and molds a molded product of excellent quality. It is an object to provide a possible slide core pressurizing device.

[0008]

A slide core pressurizing device according to the present invention comprises a first die, a second die movable relative to the first die in a first direction, and the first die or A slide core movable relative to the second mold in a second direction intersecting with the first direction, and defining a cavity by the first mold, the second mold and the slide core, Used in a molding die having a pressure pin protruding into the cavity, a first member,
A second member that can move relative to the first member in the second direction, and a slide that moves the slide core in the second direction when the second member moves away from or approaches the first member. A pressing device for a core, wherein one of the first member and the second member is fixed to one of the first mold and the second mold, and the pressing pin includes the first member and the second member. While being fixed to the other of the members, extended in the second direction and slidably held by the slide core, between the other of the first member and the second member and the slide core, In the outer regions of both of the slide cores, the pressure pin is projected into or retracted from the cavity by delaying or moving the second member with respect to the first member so as to delay the movement of the slide core into the cavity. Make sure that there is a regulation unit that regulates movement. And butterflies.

[0009]

In the pressurizing device for the slide core of the present invention, the second member relatively moves in the second direction with respect to the first member by means of hydraulic pressure or the like. Then, the slide core of the molding die is moved in the second direction by separating or approaching the second member with respect to the first member. In this way, when the slide core is brought closer to the cavity side, one of the first member and the second member is fixed to one of the first mold and the second mold of the molding die, and the pressure pin of the first member and the second member is fixed. It is fixed to the other side, extends in the second direction, is slidably held by the slide core, and has a restricting portion between the other of the first member and the second member and the slide core. Therefore, the slide core is regulated by the regulation portion and approaches the cavity side.

When the second member separates from or approaches the first member, the regulating portion provided between the other of the first member and the second member and the slide core is delayed in the pressurizing pin and enters the cavity. The slide core is regulated to project or retract from the cavity. In this slide core pressurizing device, since the restriction portion is provided in the outer region of the other of the first member and the second member and the slide core, it is not necessary to provide the slide core with a restriction hole as in the conventional case. The slide core can be downsized.

[0011]

EXAMPLES Example 1 embodying the invention of claim 1 will be described below.
5 will be described with reference to the drawings. (Embodiment 1) First, a molding die incorporating the pressure device of Embodiment 1 will be described. With this molding die,
As shown in FIG. 6, a fixed insert 2 as a first mold is fixed to the fixed main mold 1, and the fixed main mold 1 is fixed to a machine (not shown). Below the fixed main mold 1 and the fixed insert 2, a movable insert 4 as a second mold is fixed to the movable main mold 3, and the movable main mold 3 is fixed to a machine (not shown) via a die base 5. There is. Further, the movable main mold 3 is provided with a slide holder 6 via a pressure device described later, and a slide core 7 is fixed to the slide holder 6,
The slide holder 6 and the slide core 7 are slidably inserted through a plurality of columnar pressure pins 8 extending in the horizontal direction. Then, as shown in FIGS. 4 to 6, the fixed insert 2, the movable insert 4 and the slide core 7 define a cavity C, and the right end of the pressure pin 8 can be projected into the cavity C. .

The movable insert 4 and the movable main die 3 are slidably inserted through push-out pins 9 extending vertically.
The extruding pin 9 has an upper end capable of projecting into the cavity C, and a lower end fixed to the extruding plate 10 by a fixing plate 11. In addition, as shown in FIG. 1, this molding die uses four slide cores to form a cavity.
2 to 14 are connected to hydraulic cylinders 18 to 20 via slide holders 15 to 17, respectively.

As shown in FIGS. 2 to 6, the pressurizing device of the first embodiment is composed of a hydraulic cylinder having a special shape. That is, this pressurizing device has a cylinder sleeve 21 as a first member and a cylinder rod 22 as a second member that can slide in the cylinder sleeve 21 in the horizontal direction. Cylinder rod 21 of cylinder sleeve 21
2, a bracket 21a extending upward is integrally formed on the opposite side to the pressure pin 8 on the bracket 21a.
The left end of is fixed by the fixing plate 23. Further, a convex portion 21b is projected on the upper side surface of the cylinder sleeve 21, and the convex portion 21b is housed in a concave portion 6a which is concavely provided on the bottom surface of the slide holder 6. The convex portion 21b and the concave portion 6a form a regulation portion. The restriction portion does not project the right end of each pressure pin 8 from the right surface of the slide core 7 when the convex portion 21b is at the left end of the concave portion 6a, and each pressure pin 8 when the convex portion 21b is at the right end of the concave portion 6a. The right end of the slide core 7 is set to a size protruding from the right surface of the slide core 7.

A cylinder cap 24 for slidably inserting the cylinder rod 22 is fixed to the right end of the cylinder sleeve 21, and a piston 25 is fixed to the tip of the cylinder rod 22 inside the cylinder sleeve 21. . The side of the cylinder rod 22 opposite to the cylinder sleeve 21 is bent downward and fixed to the movable main mold 3. The cylinder rod 22 has a first oil supply hole 22a opening at the left end of the piston 25 and the piston 2
A second oil supply hole 22b opening at the right end of 5 is penetratingly provided, and the first oil supply hole 22a and the second oil supply hole 22b penetrate the movable main mold 3 and are connected to an external oil supply device.

When casting a cast product with this molding die, first, from the mold open state shown in FIG. 2, the external oil supply device is operated to send pressure oil to the second oil supply hole 22b to shorten the cylinder rod 22. To do. At this time, the cylinder rod 22
Is fixed to the movable main mold 3, the cylinder sleeve 21 approaches the movable main mold 3. Then, the convex portion 21b of the cylinder sleeve 21 comes into contact with the right end of the concave portion 6a of the slide holder 6, and the slide holder 6 approaches the movable insert 4. Therefore, the slide core 7 approaches the movable insert 4. When the cylinder rod 22 reaches the shortened end, the state shown in FIG. 3 is obtained.

Further, the machine is operated to move the movable main mold 3 and the like in the upward direction to bring them closer to the fixed main mold 1 and the fixed insert 2. When the movable main mold 3, the movable insert 4, and the slide core 7 come into contact with the fixed main mold 1 and the fixed insert 2, the state shown in FIG. 4 is obtained. Next, the external oil supply device is operated to send pressure oil to the first oil supply hole 22a, and the convex portion 2 of the cylinder sleeve 21 is
The cylinder rod 22 is slightly extended until 1b contacts the left end of the recess 6a of the slide holder 6. At this time,
The pressurizing pin 8 is movable with the cylinder sleeve 21.
However, since the pressure pin 8 is slidably inserted through the slide holder 6 and the slide core 7, the slide holder 6 and the slide core 7 remain fixed at the position shown in FIG. The right end of each pressurizing pin 8 is in the state of FIG. 5 in which it does not project from the right surface of the slide core 7. With this, the mold closing is completed, and the molten metal is poured into the cavity C.

After a certain amount of time has elapsed, when the molten metal is solidifying, as shown in FIG. 6, the external oil supply device is operated to send pressure oil to the second oil supply hole 22b, and the cylinder rod 2
Shorten 2. At this time, the convex portion 21b of the cylinder sleeve 21 comes into contact with the right end of the concave portion 6a of the slide holder 6 again, and the right end of the pressing pin 8 projects with a delay from the right surface of the slide core 7 to perform local pressing. As a result, the casting is cast while preventing the occurrence of defects such as shrinkage cavities due to the shrinkage of the molten metal during the progress of solidification.

In this pressurizing device, the convex portion 21b is projected on the upper side surface of the cylinder sleeve 21 and the concave portion 6a is formed on the bottom surface of the slide holder 6, so that the inside of the slide core 7 is different from the conventional one. The slide core 7 can be downsized without the need to provide such a restriction hole. In addition,
When the mold is opened, first, the external oil supply device is operated to send the pressure oil to the first oil supply hole 22a, whereby the cylinder rod 22 is extended to the state shown in FIG. Next, the machine is operated to move the movable main mold 3 and the like downward, and subsequently the external oil supply device is operated to operate the first oil supply hole 2
By sending pressure oil to 2a, the cylinder rod 22 is further extended to the state shown in FIG. After that, the extruded plate 10 is moved upward, and the extruded pin 9 extrudes the cast product from the cavity C and carries it out.

Therefore, with this pressurizing device, it is possible to prevent the occurrence of defects in the cast product and to cast a cast product of excellent quality, without causing the relatively expensive slide core 7 to become large. That is, if this pressurizing device is used for a molding die, even if a water cooling pipe or the like is built in, a desired casting can be cast without a rise in casting cost.

Further, in the molding die incorporating this pressurizing device, the first oil supply hole 22a is formed by penetrating the cylinder rod 22 with pressure oil for extending or shortening the cylinder rod 22.
And the second oil supply hole 22b, and since these are communicated with the outside through the through hole of the movable main mold 3, a pressurizing device composed of a general hydraulic cylinder for sending pressure oil by a hose or the like was used. Compared with other products, it is possible to prevent oil leakage due to breakage or loosening of the hose, etc., which in turn improves safety. Further, this improves workability of mold maintenance such as mold assembly and disassembly.

Further, Japanese Patent Laid-Open No. 6-304734 discloses, as a related art, a molding die in which a pressurizing device is incorporated in a slide holder. In the pressurizing device of the first embodiment, the slide holder 6 is used. Since the cylinder sleeve 21 and the like are not built therein, the slide holder 6 can be downsized. Further, in this molding die, since the pressurizing device is built in the movable main mold 3 in which it is possible to take a comparatively easy built-in space, the overall size is reduced. Therefore, with this molding die, it is possible to realize a reduction in casting cost due to downsizing of equipment and the like. (Embodiment 2) In Embodiment 2, the molding die of Embodiment 1 is used to cast a cast product having a shape such as a cylindrical recess. Therefore, the pressure pin 8 in the molding die of Example 1 is used as the casting pin 8 and the timing is slightly changed. Since the configuration of the molding die including the pressurizing device is the same as that of the first embodiment, the same reference numerals are used to omit the detailed description of the configuration, and the same actions and effects are also omitted.

When casting the cast product with this molding die, first, as in the first embodiment, the mold open state shown in FIG. 2 is changed to the state shown in FIG. 4 through the state shown in FIG. . With this, the mold closing is completed, and the molten metal is poured into the cavity C. After a certain amount of time has passed and immediately before solidification of the molten metal, the external oil supply device is operated to send pressure oil to the first oil supply hole 22a, as shown in FIG.
The cylinder rod 22 is slightly extended until the first convex portion 21b comes into contact with the left end of the concave portion 6a of the slide holder 6.
At this time, the cast pin 8 is separated from the movable insert 4 together with the cylinder sleeve 21, and the slide holder 6 and the slide core 7 remain at that position. Then, the right end of each cast pin 8 retracts with a delay from the right surface of the slide core 7. At this time, the resistance due to shrinkage is reduced because it is just before the solidification of the molten metal, and it is possible to pull out the columnar casting pin 8 from the cast product.

When a cast product is cast using a general molding die, the cast pin could not be removed at various timings. It was supposed that a die-cast pin having a groove should be fixed to the slide core and projected into the cavity. A casting pin having a draft is used to form a tapered recess or the like in the cast product, and the tapered recess or the like is subjected to machining such as cutting to form a cylindrical recess. In this case, extra machining is required to form a columnar recess, etc., resulting in an increase in product cost.

On the other hand, in the molding die of Example 2,
Since the casting pin can be pulled out at various timings, for example, just before solidification of the molten metal as described above, it is possible to adopt the columnar casting pin 8 to form the columnar recess C ₁ in the cast product. it can. Therefore, in this molding die, even if the cast product has a shape having a columnar recess or the like, machining is not required and the product cost can be reduced. . (Embodiment 3) As shown in FIG. 8, the pressurizing device of Embodiment 3 has a cylinder sleeve 40 and a cylinder rod 50 assembled in the opposite manner to those of Embodiments 1 and 2. That is, the cylinder sleeve 40 is fixed to the movable main mold 30, which is the first mold, and the pressure pin 8 is fixed to the cylinder rod 50. The same components as those of the first and second embodiments are designated by the same reference numerals,
Detailed explanation is omitted.

In this pressurizing device, a bracket 50a extending upward is integrally formed at the tip of the cylinder rod 50, and the left end of each pressurizing pin 8 is fixed to the bracket 50a by a fixing plate 51. . Also, the dogs 5 extending in the same direction as the pressure pins 8 are provided on the bracket 50a.
2 is fixed, and a protruding portion 52a protruding toward the slide holder 6 is projected at the tip of the dog 52. The convex portion 52a is housed in the concave portion 6a of the slide holder 6 as in the first and second embodiments. The convex portion 52a and the concave portion 6a form a regulation portion.

A cylinder cap 41 for slidably inserting the cylinder rod 50 is fixed to the left end of the cylinder sleeve 40, and a piston 42 is fixed to the tip of the cylinder rod 50 inside the cylinder sleeve 40. . The cylinder sleeve 40 fixed to the movable main die 30 is provided with a third oil supply hole 40a opening at the left end of the piston 42 and a fourth oil supply hole 40b opening at the right end of the piston 42. 3 lubrication hole 40
The a and the fourth oil supply hole 40b penetrate the movable main mold 30 and are connected to the external oil supply device.

Also in such a pressurizing device, the first and second embodiments are used.
The same action and effect as can be obtained. (Embodiment 4) As shown in FIG. 9, the pressurizing device of Embodiment 4 employs a cylinder sleeve 43 and a cylinder rod 53 which form a general hydraulic cylinder. The same components as those of the first and second embodiments are designated by the same reference numerals,
Detailed explanation is omitted.

In this pressurizing device, the cylinder sleeve 43 is fixed to the movable main mold 31 via the bracket 44, and the fixing plates 54 to 5 are attached to the tip of the cylinder rod 53.
The left end of each pressure pin 8 is fixed via 6. Further, a dog 57 extending in the same direction as each pressure pin 8 is fixed to the fixing plates 54 to 56, and a convex portion 57 a protruding toward the slide holder 6 side is projected at the tip of the dog 57. . The convex portion 57a is housed in the concave portion 6a of the slide holder 6 and the concave portion 31a of the movable main mold 31. The convex portion 57a and the concave portion 6a form a regulating portion.

A cylinder cap 45 for slidably inserting the cylinder rod 53 is fixed to the right end of the cylinder sleeve 43, and a piston 46 is fixed to the tip of the cylinder rod 53 inside the cylinder sleeve 43. . The cylinder sleeve 43 is provided with a fifth oil supply hole 43a opening at the left end of the piston 46 and a sixth oil supply hole 43b opening at the right end of the piston 46. The fifth oil supply hole 43a and the sixth oil supply hole 43a. The hole 43b is connected to an external oil supply device by a hose (not shown).

In such a pressurizing device, the movable main mold 31
Since it is not built in the engine, there is a risk that the entire size will increase, and there is a risk that the hose will be damaged or oil will leak due to loosening, etc. It is possible to exert an effect. (Fifth Embodiment) As shown in FIG. 10, the pressurizing device of the fifth embodiment employs a cylinder sleeve 43 and a cylinder rod 53 that form a general hydraulic cylinder, and these are assembled in the opposite manner to the fourth embodiment. Attached. That is, the cylinder rod 5
3 is fixed to the movable main mold 31 which is the first mold, and the pressure pin 8 is fixed to the cylinder sleeve 43. In addition, Example 1,
The same components as those in 2 and 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

In this pressurizing device, the tip of the cylinder rod 53 is fixed to the movable main mold 31 via the bracket 58 and the fixed plate 59, and each pressurizing force is applied to the rear end of the cylinder sleeve 43 via the fixed plate 47. The left end of the pin 8 is fixed. Further, a dog 48 extending in the same direction as each pressurizing pin 8 is fixed to the cylinder sleeve 43, and a convex portion 48 a protruding toward the slide holder 6 side is projected at the tip of the dog 48. The convex portion 48 a is provided in the concave portion 6 a of the slide holder 6 and the concave portion 31 of the movable main mold 31.
It is stored in a. These convex portion 48a and concave portion 6a
Constitutes the regulatory department.

Also in this pressurizing device, the same operation and effect as those of the fourth embodiment can be obtained. In the first to fifth embodiments, the first member, the second member, etc. are hydraulic cylinders, but other means such as a ball screw may be used in the present invention. Further, the pressurizing device of the present invention can be applied to a molding die such as resin injection molding.

[0033]

As described above in detail, since the slide core pressurizing device of the present invention employs the structure described in the claims, the defect of the molded product can be prevented without causing the slide core to become large. It is possible to form a molded product of excellent quality by preventing the occurrence of That is, by adopting this slide core pressurizing device in a molding die, even if a water cooling pipe or the like is built in, a desired molded product can be molded without causing a rise in molding cost. You can

If this slide core pressurizing device is adopted in the molding die, the timing can be set freely,
Even if the molded product has a shape having a columnar concave portion or the like, it is possible to reduce the cost of the product by eliminating the need for machining.

[Brief description of drawings]

FIG. 1 is a partial plan view of a molding die according to a first embodiment.

FIG. 2 is a view showing a mold opening state according to the first embodiment of FIG.
-II It is a sectional view taken along the arrow.

FIG. 3 is a diagram illustrating a state during mold closing according to the first embodiment.
It is a sectional view similar to FIG.

FIG. 4 is a diagram illustrating a state immediately before mold closing according to the first embodiment.
It is a sectional view similar to FIG.

FIG. 5 is a sectional view similar to FIG. 2 showing a mold closed state according to the first embodiment.

FIG. 6 is a diagram showing a state when local pressure is applied according to the first embodiment.
It is a sectional view similar to FIG.

7 is a cross-sectional view similar to FIG. 2 showing a state at the time of casting according to Example 2. FIG.

FIG. 8 is a sectional view similar to FIG. 2, showing a state at the time of injection according to the third embodiment.

FIG. 9 is a cross-sectional view similar to FIG. 2 showing a state at the time of injection according to the fourth embodiment.

FIG. 10 is a sectional view similar to FIG. 2, showing a state at the time of injection according to the fifth embodiment.

[Explanation of symbols]

2 ... 1st type | mold (fixed insert) 4 ... 2nd type | mold (movable insert) 7 ... Slide core C ... Cavity 8 ... Pressure pin (casting pin) 21, 40, 43 ... 1st member (cylinder sleeve) 22, 50, 53 ... Second member (cylinder rod) 21b, 6a, 52a, 57a, 48a ... Regulation part (21
b, 52a, 57a, 48a ... convex portion, 6a ... concave portion)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B29C 45/56 9350-4F B29C 45/56

Claims (1)

[Claims] 1. A first die, a second die relatively movable in a first direction with respect to the first die, and a first die intersecting the first direction with respect to the first die or the second die. A molding die having a slide core capable of relatively moving in two directions, defining a cavity by the first die, the second die and the slide core, and having a pressure pin protruding into the cavity. A first member and a second member that is movable relative to the first member in the second direction are used, and the slide core is moved by separating or approaching the second member with respect to the first member. A slide core pressurizing device for moving in the second direction, wherein one of the first member and the second member is fixed to one of the first mold and the second mold, and the pressurizing pin comprises: The second member is fixed to the other of the first member and the second member.
The slide core is slidably held by the slide core and extends between the slide core and the other of the first member and the second member and the slide core. A restriction portion is provided in the cavity so as to delay the movement of the slide core and project or retract from the cavity when the two members are separated or approached. A pressurizing device for a slide core.