CN102497946A - Die casting mold - Google Patents

Abstract

In a die-casting mold (2) for die-casting an iron-based component, a built-in core (5) is arranged inside a first concave portion of a fixed die (12). The insert core (5) leaves the fixed mold (12) together with the movable mold (11) in a state sandwiched in the molded product when the movable mold (11) leaves the fixed mold (12) after die casting. A plurality of positioning parts (14) are in contact with the insert-type core (5), so as to position the insert-type core (5) inside the fixed mold (12). The contact surfaces (5a, 14a, 5b, 14b) of the positioning part (14) in contact with the insert-type core (5) are inclined relative to the direction in which the insert-type core (5) is extracted from the fixed mold (12), And incline to the direction of increasing the external dimensions of the embedded core (5).

Description

Die casting mold

technical field

The present invention relates to die-casting forming dies with insert cores.

Background technique

Conventionally, when molding a metal molded product, die casting molding is performed in which molten metal is injected into a mold for molding. In the die-casting machine, after the molded product is injection-molded, the movable mold is separated from the fixed mold, so that the fixed mold and the movable mold are separated at the dividing plane, and the molded product can be taken out.

At this time, due to the need to draw the molded product to the split surface side, if the shape of the molded product is such that the molded product cannot be pulled out even considering the split surface, the molded product may be molded using an insert core or the like. Molded product (see Patent Document 1 (JP-A No. 7-16844) and Patent Document 2 (JP-A No. 2001-212850)).

When die-casting is performed using such an insert core, first, the insert core is positioned at a predetermined position inside the fixed mold, and then the fixed mold and the movable mold are aligned to close the mold, and then the mold is clamped. Molten metal is injected into a cavity inside the mold for die casting. After molding, the movable mold and the fixed mold are separated to open the mold.

When the mold is opened, the insert core is pulled out from the fixed mold together with the molded product, and is separated from the fixed mold together with the movable mold. Thereby, the molded product and the insert core can be taken out from the molding die (refer to Patent Document 2).

In this way, in order to extract the insert-type core from the inside of the fixed mold while the movable mold is moving, the contact surface of the insert-type core and the positioning part inside the fixed mold should be parallel to the drawing direction of the insert-type core. extend.

Contents of the invention

Die-casting using an insert core is a conventional technique in the field of die-casting using non-ferrous metal materials such as aluminum. Such a non-ferrous metal material such as aluminum has a lower hardness than an insert-type core made of an iron-based material and its surrounding positioning portion inside the stent. Therefore, even if casting burrs generated during molding are formed in the gap between the fixed mold and the insert core, the insert core and positioning parts will not be damaged by the casting burrs of non-ferrous metal materials when the mold is opened. .

However, when die-casting a hard iron-based part as a molded product, the hardness of the insert core and the fixed die body used as the insert core is close to the hardness of casting burrs of the iron-based material. Therefore, since casting burrs are generated at the contact surface between the positioning part inside the fixed mold and the insert core when injecting molten metal, the insert core may be caught on the casting burrs and the positioning inside the fixed mold may be damaged. The contact surface between the part and the embedded core is damaged.

In addition, as described above, if the contact surface between the positioning portion inside the stent and the insert core is damaged, the insert core and the injected molded product fitted therein may not be able to be pulled out from the inside of the stent.

In addition, even if the damage on the contact surface between the positioning part inside the fixed mold and the insert type core is slightly repaired by grinding or the like, the damage will become deeper every time the injection is performed, and the mold needs to be replaced. The problem of shortened die life.

In addition, it takes time to repair the damage of the positioning part inside the stent and the insert core, and there is a possibility that the production cycle time cannot be met. Or, there may be a shutdown of a production line for repairs.

The object of the present invention is to provide such a die-casting molding die: Even if iron-based hard casting burrs are generated on the contact surface of the insert-type core and the positioning part inside the fixed mold, it can be used without damaging the insert-type core. The inserted core can be pulled out smoothly under the circumstances.

The die-casting mold according to the first aspect of the present invention is a die-casting mold for die-casting iron-based parts. The die-casting molding die includes a fixed die, a movable die, a built-in core, and a plurality of positioning parts. The fixed mold has a first recess. The first recess forms a part of the cavity corresponding to the outer shape of the molded product. The movable die has a second recess. The second recess forms another part of the mold cavity. The movable die can reciprocate in a direction approaching the fixed die and in a direction away from the fixed die. The insert core is arranged inside the first concave portion of the fixed mold. After die-casting, when the movable mold leaves the fixed mold, the insert core leaves the fixed mold together with the movable mold in a state of being sandwiched in the molded product. The plurality of positioning parts are in contact with the insert-type core so as to position the insert-type core inside the fixed mold. The contact surface of the positioning part in contact with the insert-type core is inclined relative to the direction in which the insert-type core is pulled out from the fixed mold, and is inclined in the direction of increasing the external dimension of the insert-type core.

Here, since the contact surface between the positioning part inside the fixed mold and the insert-type core is inclined relative to the direction in which the insert-type core is extracted from the fixed mold, it tends to increase the shape of the insert-type core. The direction of the dimension is inclined, so even if iron-based hard casting burrs occur on the contact surface between the insert core and the positioning part, the insert core can be pulled out smoothly without damaging the insert core , thereby increasing productivity.

In the die-casting mold of the second aspect of the present invention, in the die-casting mold of the first aspect, the plurality of positioning portions are constituted by a plurality of insert blocks. A plurality of insert blocks are detachably attached to the fixed mold. The plurality of insert blocks each have at least one contact surface.

Here, the plurality of positioning parts are constituted by a plurality of insert blocks detachably attached to the fixed mold, and each of the plurality of insert blocks has at least one contact surface. In this way, since the insert core is positioned by the contact surface of the insert block, even if wear or damage occurs, only the insert block needs to be replaced, resulting in low repair and maintenance costs.

In the die-casting mold of the third aspect of the present invention, in the die-casting mold of the second aspect, the contact surface has a first contact surface and a second contact surface intersecting each other. The first contact surface and the second contact surface are inclined relative to a direction in which the insert-type core is pulled out from the fixed mold, and are respectively inclined toward a direction of increasing an outer dimension of the insert-type core.

Here, the contact surface has a first contact surface and a second contact surface intersecting each other, and the first contact surface and the second contact surface are inclined relative to the direction in which the inserted core is extracted from the fixed mold, and respectively increase the insertion Since the direction of the external dimension of the type core is inclined, each insert block has two contact surfaces, and thus the adjustment time when changing the insert block is reduced by positioning both surfaces with one insert block. Moreover, compared with the case where all the inserting blocks are individually provided by this, since the number of attachments is also reduced, it is possible to reduce the change time. Also, it is possible to accurately position the insert-type core at a predetermined position.

In the die casting molding die of the fourth aspect of the present invention, in the die casting molding die of the second aspect, the insert block is made of a material harder than the fixed die.

Here, since the insert block is made of a harder material than the stent, the cost will increase if most or all of the stent is made of a hard material, but by making the insert block a different object and using a high-hardness material, The cost of manufacture and the like is low. Also, the life of the embedded block can be extended.

Description of drawings

FIG. 1 is a structural diagram of a die-casting mold according to an embodiment of the present invention.

Fig. 2 is a view of the fixed mold, insert core and insert block in Fig. 1 viewed from the movable mold side.

Fig. 3 is a perspective view of the drop-in core in Fig. 1 .

Fig. 4 is a top view of the drop-in core in Fig. 1 .

Fig. 5 is an enlarged view of the side lower end of the insert-type core in Fig. 1 .

Fig. 6 is an enlarged cross-sectional view of a contact surface between the insert core and the fixed mold in Fig. 1 , and is a view of a state before the insert core is pulled out.

7 is an enlarged cross-sectional view of the contact surface between the insert core and the fixed mold in FIG. 1 , and is a diagram showing a state in which the insert core is pulled out.

FIG. 8 is a view of an integrally formed scroll member, insert core, runner, and remaining material portion in FIG. 1 viewed from the front side of the scroll portion.

Fig. 9 is a side view of an integrally formed scroll member, insert core, runner, and material remaining portion in Fig. 1 .

FIG. 10 is a view of an integrally formed scroll member, insert core, runner, and material remaining portion in FIG. 1 viewed from the back side of the scroll portion.

FIG. 11 is a process diagram of a die casting molding method using the molding apparatus in FIG. 1 , and is a diagram of an initial state.

Fig. 12 is a process diagram of a die casting molding method using the molding device in Fig. 1, and is a diagram of a die clamping process.

Fig. 13 is a process diagram of a die casting molding method using the molding apparatus in Fig. 1, and is a diagram of a material injection process.

Fig. 14 is a process diagram of a die casting molding method using the molding apparatus in Fig. 1, and is a diagram of a filling process.

FIG. 15 is a process diagram of a die casting molding method using the molding apparatus in FIG. 1 , and is a diagram showing a state in which filling is completed.

Fig. 16 is a process diagram of a die casting molding method using the molding device in Fig. 1, and is a diagram of a mold opening process.

Fig. 17 is a process diagram of a die-casting molding method using the molding device in Fig. 1, and is a diagram of an ejection process.

Fig. 18 is a process diagram of a die-casting molding method using the molding apparatus in Fig. 1, and is a diagram showing a process of taking out a molded product.

Detailed ways

Next, a die-casting die 2 as an embodiment of the die-casting die of the present invention and a die-casting apparatus 1 including the die-casting die 2 will be described with reference to the drawings.

<Structure of Die Casting Apparatus 1>

A die-casting apparatus 1 (hereinafter referred to as "forming apparatus 1") shown in FIG. 1 is a molding apparatus for die-casting iron-based components. The forming device 1 forms a movable scroll member such as a scroll compressor as an iron-based component, that is, as shown in FIGS. 8 to 10 , the forming device 1 forms a scroll member 50, and the scroll member 50 has: The spiral portion 51 ; the plate-shaped end plate 52 formed on the base side of the spiral portion 51 ; and the cylindrical boss 53 formed on the opposite side of the spiral portion 51 on the end plate 52 .

The forming device 1 is equipped with: a die-casting forming die 2 (hereinafter referred to as "forming die 2") for die-casting a scroll member 50 as an iron-based part; a scroll pusher 3; a material filling mechanism 6; a pusher a driving mechanism 7; and a movable mold driving table 8.

In this molding device 1, the semi-molten/semi-solidified metal material C, which is an iron-based semi-molten or semi-solidified metal material, is filled into the molding die 2 by applying pressure with the material filling mechanism 6, whereby the scroll can be die-casted. Part 50.

After the scroll member 50 is formed, one movable die 11 constituting the forming die 2 is slid on the movable die drive table 8 and separated from the other fixed die 12 (see FIG. 16 ). Then, the scroll push rod 3 and the other push rod 9 are pushed into the movable mold 11 by the push rod driving mechanism 7, so that the scroll member 50 is moved from the state of sandwiching the embedded core 5 The inside of the mold 11 is taken out (refer to FIG. 17 ).

Next, the molding die 2 and the scroll pusher 3 will be described in further detail in other items.

<Structure of Die Casting Die 2>

As shown in Figure 1, the forming mold 2 has: a movable mold 11 that reciprocates along the movable mold driving table 8; a fixed mold 12 fixed on the movable mold driving table 8; a built-in core 5; Block 14.

As shown in FIG. 1, the movable mold 11 has, in the mold cavity 13 for forming the scroll member 50: a scroll groove 13a for forming the scroll portion 51 as the second concave portion of the present invention; and Flat plate groove 13b for forming end plate 52 .

As shown in FIG. 1 , the fixed mold 12 has a cylindrical groove 13 c for forming a cylindrical boss 53 in a cavity 13 for forming a scroll member 50 . Furthermore, the fixed die 12 has a runner groove 13d for forming the runner 54 and an insertion recess 13e into which the insert core 5 is inserted.

Here, the cylindrical groove 13c, the runner groove 13d, and the insertion recessed part 13e correspond to the 1st recessed part of this invention.

As shown in FIG. 2, in the fixed mold 12 of this embodiment, the outer part 12a and the inner part 12b can be divided. Since the inner portion 12b is in contact with the highly heated semi-molten/semi-solidified metal M, the inner portion 12b is made of a material with high heat resistance. Furthermore, the outer part 12a and the inner part 12b of the fixed mold 12 may be integrated.

As shown in Figure 1, the movable mold 11 is fixed on the movable platen 21, and together with the movable platen 21, moves back and forth on the movable mold driving table 8 toward the direction close to the fixed mold 12 and the direction away from the fixed mold 12 . The fixed mold 12 is fixed to the fixed platen 22 and is stationary on the stage 8 .

The insert type core 5 is arranged inside the mold cavity 13 so as to form a runner 54 which is a flow path for filling the semi-molten or semi-solidified metal material into the mold cavity 13, and the mold cavity 13 is a casting space in the shape of the scroll member 50 formed when the movable mold 11 and the fixed mold 12 are combined.

The drop-in core 5 is disposed between the cavity 13 and the runner 54 , and is detachably attached to the fixed mold 12 . That is, insert type core 5 is inserted into fixed mold 12 from the left direction in FIG. 1 .

The insert core 5 is disposed between the cavity 13 and the runner 54 so as to form the runner 54 which is a flow path for protruding from the end plate 52 which is a flat plate portion. The second surface 52 b on the opposite side to the first surface 52 a of the scroll-shaped portion 51 having a protruding portion is filled with semi-molten or semi-solidified metal in the plate thickness direction of the end plate 52 .

The insert core 5 is disposed inside the insertion recess 13e of the fixed mold 12, and when the movable mold 11 is separated from the fixed mold 12 after die casting, the insert core 5 is sandwiched between the scroll member 50 and the The movable mold 11 leaves the fixed mold 12 together.

The semicircular section groove 5c of the insert core 5 forms a part of the cylindrical groove 13c of the fixed die 12 shown in FIGS. 2 to 3 to form the cylindrical boss 53 shown in FIG.

The insert block 14 is a pair of left and right positioning parts in contact with the insert-type core 5 so as to position the insert-type core 5 inside the fixed mold 12 . The pair of insert blocks 14 are prisms with an L-shaped cross section, and have a first contact surface 14 a and a second contact surface 14 b that are in contact with the insert core 5 . The interval between a pair of embedded blocks 14 is equal to or greater than the width of the embedded core 5 so as to be able to support the overall width of the embedded core 5 .

The first contact surface 5a, 14a and the second contact surface 5b, 14b extending longitudinally of the insert block 14 shown in FIG. The direction in which the center is pulled out (the direction perpendicular to the paper surface in FIG. 2 ) is inclined, and is inclined in the direction of increasing the outer dimension of the insert core 5 (see FIGS. 4 to 7 ).

For example, as shown in FIG. 4, the first contact surface 5a extending longitudinally of the insert-type core 5 is inclined by θ1 (0.5° to 5°, preferably about 2°) toward the extraction direction D of the insert-type core 5. (This is because when the inclination angle is less than 0.5 degrees, the effects of the present invention cannot be sufficiently obtained, and when it is more than 5 degrees, the insert core may fall). In addition, correspondingly, the longitudinally extending contact surface 14 a of the insert block 14 is also inclined in the same direction in order to be able to make surface contact with the first contact surface 5 a of the insertion core 5 . On the other hand, as shown in FIG. 5, the second contact surface 5b extending in the lateral direction of the insert core 5 is inclined by θ2 (0.5° to 5°, preferably 2°) to the extraction direction D of the insert core 5. left and right) (this is because when the inclination angle is less than 0.5 degrees, the effect of the present invention cannot be sufficiently obtained, and when it is greater than 5 degrees, the insert-type core may fall). In addition, correspondingly, the contact surface 14 b extending in the transverse direction of the insert block 14 is also inclined in the same direction, so as to be able to make surface contact with the second contact surface 5 b of the insertion core 5 .

Thus, even if iron-based hard casting burrs are produced on the contact surface between the insert-type core 5 and the positioning portion (such as an insert block), since the insert-type core 5 and the insert block 14 are in a tapered shape, as shown in FIG. 6 to 7, the gap t1 is enlarged to t2, which is much larger than t1, by pulling the insert core 5. Therefore, the first longitudinally extending first part of the insert block 14 in contact with the insert core 5 The contact surfaces 5a, 14a and the second contact surfaces 5b, 14b extending in the lateral direction are less likely to be damaged by casting burrs, and new damages will not be further formed due to the generated damages.

In addition, the insert-type core 5 of this embodiment is provided with the taper-shaped protrusion 17 on the lower surface of the insert-type core 5 shown in FIG.2 and FIG.5. When the tapered protrusions 17 come into contact with the protrusions 18 (see FIG. 1 ) of the movable mold 11, the insert core 5 is pushed up when the mold is closed.

Since the insert block 14 is detachably attached to the fixed mold 12 by screws or the like, the insert block 14 can be replaced without disassembling the fixed mold 12 .

Insert block 14 is made of a harder material than fixed die 12 . For example, when pre-hardened steel or the like is used as the die steel for the fixed die 12 , die steel or the like that is harder than pre-hardened steel is used for the insert block 14 . Therefore, the life of the insert block 14 is extended.

<Structure of Scroll Push Rod 3>

The scroll pusher 3 shown in FIG. 1 is attached to the pusher drive mechanism 7 , and can pass through the through hole 15 formed in the movable mold 11 to go in and out at the end of the scroll groove 13 a of the cavity 13 .

The scroll pusher 3 pushes the tip 51 a of the scroll portion 51 of the scroll member 50 after the scroll member 50 is formed, so that the scroll member 50 can be pushed out from the movable mold 11 .

<Overview of die casting method>

The scroll member 50 formed in this embodiment is a movable scroll, which has a cylindrical boss 53 protruding from the opposite side of the first surface 52a of the end plate 52 from which the scroll-shaped portion 51 protrudes. side of the second surface 52b. Therefore, the semi-molten or semi-solidified metal is filled into the cavity 13 of the forming die 2 of the scroll member 50 from the portion of the boss 53 located at the center of the end plate 52 through the runner 54, which is A flow path for filling the cavity 13 with semi-molten or semi-solidified metal.

Furthermore, one end of the formed runner 54 is connected to the boss 53 , and the other end is connected to the material remaining portion 55 on the side of the material filling mechanism 6 . Therefore, as shown in FIG. 13 , after the formed scroll member 50 is taken out from the forming die 2 , the runner 54 and the remaining material portion 55 are cut off.

In addition, in order to remove the scale on the surface of the semi-molten/semi-solidified metal material C that has just flowed out from the material filling mechanism 6, the material filling mechanism 6 is not arranged directly behind the boss 53, but is separated by an amount equivalent to the runner 54. distance configuration. As a result, the scale removed from the surface of the semi-molten/semi-solidified metal material C mainly accumulates in the material remaining portion 55 , so that the scale is less likely to be mixed into the scroll member 50 .

<Procedures of die casting method>

Next, the die casting molding method using the molding apparatus 1 of the embodiment will be described with reference to FIGS. 11 to 18 .

First, in the initial state shown in FIG. 11 , the insert core 5 is inserted into the insertion recess 13e. Starting from the initial state shown in FIG. 11, as shown in FIG. 12, the movable mold 11 is moved along the movable mold driving table 8, so that the movable mold 11 and the fixed mold 12 are connected to form a mold cavity 13 (combined modeling process).

Then, as shown in FIG. 13 , the semi-molten/semi-solidified metal material C is charged into the material filling mechanism 6 (material injection process).

Then, as shown in FIG. 14, the plunger 6a of the material filling mechanism 6 is moved by hydraulic pressure or air pressure, thereby applying pressure to fill the semi-molten/semi-solidified metal material C into the forming die 2 (filling process). At this time, the semi-molten/semi-solidified metal M on the way of filling is filled into the cavity 13 through the runner groove 13d.

Then, as shown in FIG. 15 , the filling of the semi-molten/semi-solidified metal M to the entire mold cavity 13 is completed, and after that, when the semi-molten/semi-solidified metal M is cooled and solidified, the formed scroll member 50 is formed in the mold cavity. The cavity 13 is internally shaped (filled). The formed scroll member 50 is connected to the runner 54 and the remaining material portion 55 formed inside the runner groove 13d.

Then, as shown in FIG. 16 , the movable mold 11 is moved along the movable mold driving table 8 to separate the movable mold 11 from the fixed mold 12 to open the forming mold 2 (mold opening process). At this time, the insert core 5 moves toward the movable mold 11 while being sandwiched between the scroll member 50 and the runner 54 . In addition, during the mold opening process, the plunger 6a of the material filling mechanism 6 is slightly pushed out so that the integrated object of the scroll member 50, the runner 54, and the embedded core 5 leaves the fixed mold 12 and It is easy to move to the movable mold 11 side.

Then, as shown in FIG. 17, by driving the push rod drive mechanism 7, the scroll push rod 3 protrudes into the scroll groove 13a of the movable die 11, so that the scroll push rod 3 presses the scroll member. 50 of the scroll-shaped portion 51. also. The other push rod 9 is also driven by the push rod driving mechanism 7 to protrude from the movable mold 11 to push the part other than the wrap of the molded product. Thus, the integrally formed scroll member 50 , runner 54 , remaining material portion 55 , and insert core 5 can be pushed out from the inside of the movable mold 11 (pushing process). In addition, while being pushed out, the plunger 6a returns to the original position.

Then, as shown in FIG. 18 , the molded scroll member 50 , runner 54 , material remaining portion 55 , and insert core 5 are taken out from the inside of the molding die 2 (molded product taking-out process). . The insert core 5 is fitted with the scroll member 50 and the runner 54 . At this time, the scroll push rod 3 and the other push rod 9 return to the initial state in FIG. 11 .

The formed scroll member 50 is cut at the boundary portion between the runner 54 and the boss 53 to be separated from the runner 54 and the remaining material portion 55 . At the same time, the insert core 5 sandwiched between the scroll member 50 and the runner 54 is also separated.

As for the final finishing of the scroll member 50 , by performing surface finishing by machining, the finished product of the scroll member 50 can be finished to a size and surface roughness required for the finished product.

<Features of Embodiment>

(1)

In the conventional drop-in type core, since the gap with the insert block is constant, when it is damaged, the damage will damage the mold and cause linear damage in the pulling direction. However, in this embodiment, as shown in FIG. 2 and FIGS. , 14b are inclined relative to the direction in which the insert-type core 5 is extracted from the fixed mold 12 (the direction of the near side perpendicular to the paper surface in FIG. The direction is tilted.

Thus, as shown in FIGS. 6 to 7 , the gap is enlarged by pulling the insert core 5 , and therefore, the first contact surface extending longitudinally of the insert block 14 in contact with the insert core 5 5a, 14a and the second contact surfaces 5b, 14b extending in the lateral direction are less likely to be damaged by casting burrs, and new damages will not be further formed due to the generated damages.

As a result, the insert-type core 5 can be smoothly withdrawn from the fixed mold 12 after molding, and troubles such as inability to withdraw from the fixed mold 12 can be eliminated. In addition, since the contact surfaces 5a, 14a and 5b, 14b of the insert block 14 and the insert core 5 are prevented from being damaged due to casting burrs, the life of the insert core 5, insert block 14, and other molds is prolonged. In addition, since damage to the insert core 5 and the insert block 14 can be suppressed, the number of production line stoppages due to damage repair can be greatly reduced, and the productivity of formed products such as the scroll member 50 can be improved.

(2)

In the molding die 2 of the embodiment, the plurality of positioning portions are constituted by a plurality of insert blocks 14 detachably attached to the fixed die 12, and each of the plurality of insert blocks 14 has at least one contact surface 14a and 14b. In this way, since the insert-type core 5 is positioned using the contact surfaces 14a and 14b of the insert block 14, even if wear or damage occurs, only the insert block 14 needs to be replaced, so repairs, maintenance, etc. low cost.

(3)

In the forming die 2 of the embodiment, the contact surface of the insert block 14 has a first contact surface 14a and a second contact surface 14b that intersect each other at an angle that is orthogonal or nearly orthogonal, and the first contact surface 14a and the second contact surface 14b is inclined with respect to the direction D in which the insert-type core 5 is pulled out from the fixed mold 12, and is inclined in a direction of increasing the outer dimension of the insert-type core 5, respectively. Since each insert block 14 has two contact surfaces 14a and 14b, the adjustment time when changing the insert block 14 is reduced by positioning both surfaces with one insert block 14 . Moreover, compared with the case where all the fitting blocks 14 are individually provided by this, since the number of attachments is also reduced, it is possible to reduce the change time. Also, it is possible to accurately position the insert core 5 at a predetermined position.

(4)

In the molding die 2 of the embodiment, the insert block 14 is detachably attached to the fixed die 12 by screwing or the like. Accordingly, since the insert block 14 can be replaced, the life of the fixed die 12 is extended.

(5)

In the molding die 2 of the embodiment, since the insert block 14 is made of a harder material than the fixed die 12, the cost will increase if most or all of the fixed die 12 is made of a hard material, but by making the insert block 14 High hardness materials are used for different objects, so that the cost of manufacture etc. is low. Also, the life of the insert block 14 is extended.

<Modification>

In the above-mentioned embodiment, as an example of the positioning portion for positioning the insert-type core 5 inside the fixed mold 12, the insert block 14 provided separately from the fixed mold 12 has been described as an example. The invention is not limited thereto. As a modified example of the present invention, instead of providing the insert block 14 , a step may be formed on the inner wall of the fixed mold 12 as a positioning portion, and the insertion core 5 may be positioned using the step.

In this case, even if iron-based hard casting burrs occur on the contact surface between the insert core 5 and the positioning portion, the insert core 5 can be pulled out smoothly without damaging the insert core 5 5.

Industrial availability

The present invention can be widely applied to die-casting molds for die-casting iron-based components. Therefore, it can be widely applied to die-casting molds for die-casting various iron-based materials such as molten, semi-molten, or semi-solidified iron-based materials.

prior art literature

patent documents

Patent Document 1: Japanese Patent Application Laid-Open No. 7-16844

Patent Document 2: Japanese Patent Laid-Open No. 2001-212850

Claims (4)

1. a casting forming mould (2), this casting forming mould (2) are used for the casting forming iron-based parts, wherein,

Said casting forming mould (2) possesses:

Fixed die (12), it has first recess, and this first recess forms the part of the die cavity (13) corresponding with the outer shape of formed products;

But dynamic model (11), it has second recess, and this second recess forms another part of said die cavity (13), but said dynamic model (11) can be to moving back and forth near the direction of said fixed die (12) and the direction of leaving said fixed die (12);

Built-in type core (5); It is configured in the inside of first recess of said fixed die (12); Behind casting forming; When but said dynamic model (11) leaves said fixed die (12), said built-in type core (5) but together leave said fixed die (12) with state and the said dynamic model (11) that is clipped in the said formed products; And

A plurality of location divisions, they contact with said built-in type core (5), so that said built-in type core (5) is positioned in said fixed die (12) inside,

The contact-making surface (5a, 5b, 14a, 14b) that said location division contacts with said built-in type core (5) tilts with respect to the direction that said built-in type core (5) is extracted out from said fixed die (12), and tilts to the direction of the appearance and size that increases said built-in type core (5).

2. casting forming mould according to claim 1 (2), wherein,

Said a plurality of location division is made up of a plurality of embedded blocks (14) that loading and unloading are installed on said fixed die (12) freely,

Said a plurality of embedded block (14) has at least one said contact-making surface (14a, 14b) respectively.

3. casting forming mould according to claim 2 (2), wherein,

Said contact-making surface (14a, 14b) has cross one another first contact-making surface (14a) and second contact-making surface (14b),

Said first contact-making surface (14a) and second contact-making surface (14b) tilt with respect to the direction that said built-in type core (5) is extracted out from said fixed die (12), and tilt to the direction of the appearance and size that increases said built-in type core (5) respectively.

4. casting forming mould according to claim 2 (2), wherein,

Said embedded block (14) is by than the hard made of said fixed die (12).

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