JP2003025387A - Sliding mechanism for mold for injection molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sliding mechanism for a mold capable of assuring a large stroke amount in a small installation space. SOLUTION: The sliding mechanism for the mold for injection molding comprises a slide core means mounted at one of first and second molds and capable of reciprocating between an advancing position approaching to a cavity and a separating position separate from the cavity, and a locking means 16 mounted at the other of the first and second molds to lock the slide core means to the advancing position. The slide core means and the locking means respective have gradient surfaces 28 and 54. The gradient surfaces are constituted to move the slide core means to the advancing position by bringing the surfaces into contact with each other when the molds relatively approach. One of the surfaces have a dovetail 56 and the other has a dovetail groove 30 so that when the surfaces are brought into contact with each other, the dovetail is engaged with the dovetail groove.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide mechanism for an injection molding die, and more particularly to a slide mechanism for reciprocating a slide core of the injection molding die.

[0002]

2. Description of the Related Art In general, injection molding for molding a material to mass-produce a product uses a mold including a fixed mold and a movable mold configured to be movable with respect to the fixed mold. Then, the fixed mold and the movable mold are joined, and the molten material is injected and cured in the space (cavity) formed between the molds,
Furthermore, the two molds are separated (mold open), and the product molded in the cavity is taken out.

When a molded product having a boss hole, an undercut portion, etc. is manufactured by injection molding, the boss hole portion, the undercut portion, etc. are separated from the movable mold and the fixed mold after injection molding, or separated from the mold. It interferes with product removal. When manufacturing such an injection-molded product by injection molding, the boss hole and the undercut portion are formed by arranging the tip portion at a predetermined position in the cavity when the molten material is injected, and the mold after the molten material is hardened. At the time of opening, a slide core (side core) is used that is retracted from a predetermined position in the cavity to enable mold separation and product removal. This slide core takes a forward position where the tip portion is arranged at a predetermined position in the cavity at the time of injection molding when the fixed mold and the movable mold are joined and the molten material is injected into the cavity, and the injection molding is completed. When the mold is opened, the tip end portion takes a retracted position retracted from a predetermined position in the cavity.

As a mechanism for moving the slide core between the forward movement position and the backward movement position, a mechanism using an angular pin that is inclined with respect to the moving direction of the mold (the normal line of the mold matching surface) is used. Is used.

[0005]

However, in the mechanism using the angular pins, an installation space for arranging the angular pins and the like is required at the outer position of the slide core body, and the mold becomes large. . Further, in the mechanism using the angular pin, when a wide slide (long length along the cavity) is reciprocated, the slide is twisted and it becomes difficult to move the slide smoothly. Furthermore, if one slide is reciprocated using a plurality of angular pins, it becomes difficult to synchronize the operation of the plurality of angular pins, and the adjustment becomes complicated.

In addition, angular pins are
The limit is about 25 degrees with respect to the normal to the die-matching surface, and it is difficult to tilt more than this. For this reason,
It is difficult to secure a large slide stroke amount with respect to the opening / closing stroke amount of the mold.

The present invention has been made in view of the above points, and an object of the present invention is to provide a mold slide mechanism capable of securing a large stroke amount in a small installation space.

[0008]

According to the present invention, one of the first and second molds attached to and joined to one of the first and second molds which can move relative to each other and can be bonded to each other. Slide core means reciprocally movable between an advanced position close to a cavity formed between them and a retracted position away from the cavity; and a slide core attached to the other of the first and second molds, A slide mechanism of an injection-molding die, comprising: a locking means for locking the core means to the advance position, wherein the slide core means and the locking means are:
Each is provided with an inclined surface, and the inclined surfaces are configured to come into contact with each other when the molds relatively approach each other to move the slide core means to the advanced position, and the inclined surfaces are arranged along one of the inclined surfaces. A dovetail groove is provided along the other of the inclined surfaces, and a dovetail groove is provided along the other of the inclined surfaces, and the dovetail groove is configured to fit into the dovetail groove during contact of the inclined surface. A sliding mechanism is provided.

With such a construction, when the two molds approach each other, the slidable means is brought to the forward position by joining the slant surfaces of the slide core means and the locking means to each other and by fitting the slidable surfaces into the dovetail groove. Be moved. Then, the slide core means is locked at the forward position by the locking means.
Further, when the two molds are separated from each other, the sliding means is moved toward the retracted position due to the fitting in the dovetail groove. Therefore, according to such a configuration, it is possible to reciprocate the slide core means between the forward movement position and the backward movement position by using the locking means for locking the slide core (slide core means) at the forward movement position. it can.

According to a preferred aspect of the present invention, the slide core means includes a slide core and a slide unit connected to the slide core, and the inclined surface is formed on the slide unit. With such a configuration, the slide unit can be shared.

According to another preferred embodiment of the present invention, the dovetail is formed on a dovetail member attached along the inclined surface. The dovetail groove is formed in a dovetail groove member attached along the inclined surface.
According to these configurations, the dovetail member and the dovetail groove member can be standardized.

According to another preferred aspect of the present invention, there is provided a biasing means for biasing the slide core means toward the retracted position.

According to another preferred aspect of the present invention, the first and second cassette molds that are movable relative to each other and can be joined to each other, and are attached to one of the first and second cassette molds, Slide core means reciprocally movable between an advanced position close to a cavity formed between the joined first and second cassette molds and a retracted position away from the cavity; And a second die, which is attached to the other of the second die, and is provided with a locking means for locking the slide core means in the forward movement position, wherein the slide core means and the locking means are respectively An inclined surface, wherein the inclined surface is configured to abut each other during relative movement of the mold to move the slide core to the forward position, and is provided along one of the inclined surfaces, Previous Grooves Yes along the other inclined surface is provided, the Yes and dovetail groove are injection mold in contact is configured as interdigitated of the inclined surface is provided.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An injection molding die according to a preferred embodiment of the present invention will be described in detail below with reference to the drawings. The injection molding die includes a fixed die and a movable die. These fixed molds and movable molds are designed so that they can be moved between a mold open position in which they are separated from each other and a mold clamping position in which they are joined to form a cavity corresponding to the product shape. Installed on. This injection molding die, like a known injection molding die, performs injection molding by injecting a molten resin material into a cavity formed between a fixed die and a movable die at a mold clamping position. Then, the movable mold is moved to the mold open position, and the cured product is removed from the mold. In the mold of the present embodiment, the fixed mold and the movable mold each have a stationary cassette mold that can be detached in a cassette manner in the center, and
This is a so-called cassette-type mold including a moving-side cassette mold.

First, the structure of the stationary-side cassette mold 10 will be described with reference to FIG. FIG. 1 shows a fixed-side cassette mold 1.
It is a schematic perspective view which shows the structure of 0.

As shown in FIG. 1, the fixed-side cassette mold 10 includes a fixed-side mounting plate 12 having a substantially rectangular shape and a substantially rectangular parallelepiped-shaped cabinet arranged at a substantially central position of the fixed-side mounting plate 12. And a block 14. The cavity block 14 is a main part of a mold that forms a cavity together with a core block described later, and is made of a metal material suitable for the mold. The mold block 14 is, for example, cut based on the shape data of the product manufactured by injection molding, and the surface thereof has irregularities corresponding to the shape of the product. In addition, the uneven shape is omitted in FIG.

The locking units 16a, 16b, 16 are provided at the outer positions of the four sides of the cabinet block 14, respectively.
c and 16d are arranged. Locking unit 16
The a, 16b, 16c and 16d function as a lock means for locking the slide core in the forward movement position. The locking units 16 a, 16 b, 16 c, 16 d are members extending along each side of the cabinet block 14, and are attached to predetermined positions of the fixed-side attachment plate 12 with bolts.

Further, in the vicinity of the four corners of the fixed side mounting plate 12,
A guide bush 18 for accommodating the guide pin of the movable cassette mold is attached.

Next, the structure of the locking units 16a, 16b, 16c and 16d will be described in detail with reference to FIG. FIG. 2 is a perspective view of the locking block 16d arranged along the longitudinal direction of the cabinet block 14. Other locking blocks 16a, 16b and 16
The basic configuration of c is the same as that of the locking block 16d.

As shown in FIGS. 1 and 2, the locking block 16d includes a rectangular substrate portion 20 and a triangular columnar main body portion 22 arranged along one side in the longitudinal direction of the substrate portion 20. I have it. The slope of the main body 22 forms an angle of about 120 degrees with the surface of the substrate 20.
Two plate-shaped dovetail groove members 24, 24 are provided along this slope.
Are attached by bolts 26. The surface of the dovetail groove member 24 is an inclined surface 28 extending substantially parallel to the inclined surface of the main body 22, and a dovetail groove 30 extending in the inclination direction is formed at the center of the inclined surface 28. The locking block 16d includes the dovetail groove 24 and the inclined surface 2.
6 is fixed to the fixed side mounting plate 12 so as to face the cabinet block 14. Further, the inclined surface 28 is inclined by about 30 degrees from the normal to the mold dividing surface.

Next, referring to FIG. 3, the moving side cassette mold 4
The configuration of 0 will be described. FIG. 3 shows the moving side cassette mold 40.
2 is a schematic perspective view showing the configuration of FIG.

As shown in FIG. 3, the moving side cassette mold 40 includes a substantially rectangular fixed side mounting plate 42 and a substantially rectangular parallelepiped-shaped core block arranged at a substantially central position of the fixed side mounting plate 42. 44 and. Core block 44
Is a main part of a mold that is joined to the above-mentioned cabinet block 14 and forms a cavity that is a molding space, and is formed of a metal material suitable for the mold. Core block 44
Also, based on the shape data of the product manufactured by injection molding, for example, cutting is performed, and unevenness corresponding to the product shape is formed on the surface thereof. In addition, in FIG. 3, these uneven shapes are omitted.

Slide units 46a, 46b, 46c are provided at the outer positions of the four sides of the core block 44, respectively.
46d is arranged. Slide units 46a, 4
6b, 46c, and 46d are configured to be capable of reciprocating between a forward movement position and a backward movement position together with a slide core connected thereto.

Further, in the vicinity of the four corners of the moving side mounting plate 42,
A guide pin 48 accommodated in the guide bush 18 of the fixed-side cassette mold 10 is attached.

Next, the construction of the slide units 46a, 46b, 46c and 46d will be described in detail with reference to FIGS. FIG. 4 is an exploded perspective view of the slide unit 46d arranged along the long side of the core block 44. Other slide units 46a, 46b, 46c
However, the basic configuration is the same as the locking block 16d.

As shown in FIGS. 3 and 4, the slide unit 46d includes a rectangular substrate 50 and a substrate 50.
And a main body portion 52 having a triangular prism shape attached to the.
One side of the main body 52 is approximately 12 degrees from the surface of the substrate 50.
It is attached to the substrate 50 so that the inclined surface 54 forms an angle of 0 degree. Therefore, the inclined surface 54 is also the inclined surface 28.
In the same manner as above, it is inclined about 30 degrees from the normal to the mold dividing surface. Further, along the inclined surface 54, two dovetail members 56, 56 are attached by bolts 58.
The dovetail member 56 has such a size and shape that it can be fitted into the dovetail groove 30 of the corresponding slide unit 46d and can slide in the dovetail groove 30 when the die is clamped.

A surface 60 opposite to the inclined surface 54 of the main body 52
The slide core (slide piece) 62 has a bolt 64
The mounting member 66 fixed with is fixed with bolts 68.

Grooves 70 are formed on both side surfaces of the substrate 50. The groove 70 is provided in the slide unit 4
When 6d is attached to the moving side attachment plate 42, the substrate 5
It is a guide groove that fits in the guide rail portions 72 located on both sides of 0 to allow the slide unit 46d to accurately reciprocate between the forward movement position and the backward movement position.

In this embodiment, each slide unit 46
Is normally always biased to the retracted position shown in FIG. FIG. 5 is a schematic cross-sectional view showing a configuration for urging the slide unit 46d to move to the retracted position.
As shown in FIG. 5, the slide unit 46d is formed with a through hole 72 extending toward the core block 44. The slide positioning bolt 74 is inserted through the through hole 72. The tip of the slide positioning bolt 74 is fixed to the core block 44. Large diameter portions 76 and 78 having an enlarged inner diameter are formed at both ends of the through hole 72, respectively.

A compression spring 80 is arranged between the end surface of the large diameter portion 78 on the inner side (core block side) of the through hole 72 and the core block 44, and biases the slide unit 46d in the direction of arrow A. And is placed in the retracted position.

On the base end side of the slide positioning bolt 74, an expanded diameter having an outer diameter smaller than the inner diameter of the large diameter portion 76 on the outer side of the through hole 72 and larger than the inner diameter of the central portion of the through hole 72. A portion (flange portion) 82 is formed.
The position where the enlarged diameter portion 82 contacts the terminal surface of the outer large diameter portion 76 of the through hole 72 is the limit position in the retracted position direction (arrow A direction) of the slide unit 46d.

In this embodiment, the locking block 1
6, when the fixed type and the movable type approach each other, the inclined surface 28 of the fixed locking block 16 engages with the inclined surface 52 of the movable slide unit 46 in the retracted position. And the slide unit 4
6 on the inclined surface 52 of the locking block 1
It is configured to fit in the dovetail groove 30 of 6. When the fixed mold and the movable mold are closer to each other, the cam action of the inclined surfaces 28 and 52 moves the slide unit 46 toward the forward position, and when the mold clamping is completed, the slide unit 46 is placed at the forward position. Moreover, it is configured to be locked in that position. In the present embodiment, the dovetail member 56 and the dovetail groove member 24 are formed of a material having excellent wear resistance such as SKS3 hardened steel.

Next, the reciprocating motion of the slide unit 46 between the forward and backward positions will be described with reference to FIGS. 6 and 7. FIG. 6 is a schematic cross-sectional view showing the positional relationship between the slide unit 46 and the locking block 16 when the mold is opened, and FIG. 7 shows the slide unit 46 and the locking block 16 when the mold is clamped. It is a typical sectional view showing a physical relationship.

In the mold open state shown in FIG. 6, the slide unit 46 is urged toward the retracted position by the action of the compression spring, and the slide unit 46 and the slide core 62 attached thereto are arranged in the retracted position. Has been done. When the fixed mold (fixed-side cassette mold 10) and the movable mold (movable-side cassette mold 40) approach each other in the direction of arrow B for injection molding, the inclined surface of the slide unit 46 in the retracted position. 52 is engaged with the inclined surface 24 of the locking block 16 on the fixed side, and the slide unit 4
A dovetail 56 attached to the sloped surface 52 of 6 fits into the dovetail groove 30 of the locking block 16. When the two molds further approach each other, the cam action of the inclined surfaces 24, 52 causes the slide unit 46 to move in the forward movement direction (direction of arrow C). When the mold clamping is completed,
The slide unit 46 is placed in the forward position and locked in that position by the locking block 16 (FIG. 7). When the two molds are separated, the slide unit 46 is moved in the retracted position direction (direction of arrow D) by the action of fitting the dovetail 56 and the dovetail groove 30 and the biasing force of the compression spring. Become.

The present invention is not limited to the above-described embodiments, but various changes and modifications can be made within the scope of the matters described in the claims.

In the above embodiment, the inclined surfaces of the locking unit and the slide unit are inclined by about 30 degrees from the normal line of the mold dividing surface, but the inclination angle is in the range of 0 degree to about 45 degrees. It can be selected appropriately.

In the above embodiment, the locking unit is attached to the fixed side and the slide unit is attached to the moving side, but the locking unit may be attached to the moving side and the slide unit is attached to the fixed side.

Further, in the above embodiment, the mold is a cassette mold, but the slide mechanism of the present invention can be applied to other types of molds.

Further, in the above embodiment, the dovetail groove and the dovetail groove member are provided to form the dovetail groove and dovetail groove. However, another method, for example, a slide unit or a locking block is directly processed, May be provided.

Further, in the above embodiment, each slide unit and the locking block are provided with two dovetail grooves, but one slide groove or three or more slide grooves may be provided.

Further, the slide mechanism and the injection molding die of the present invention can be used not only for the die for injection molding with resin such as plastic but also for the die for injection molding using other material such as metal. Applied.

[0042]

According to the present invention, there is provided a mold slide mechanism capable of ensuring a large stroke amount in a small installation space.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a configuration of a fixed-side cassette mold.

FIG. 2 is a perspective view of a locking block arranged along a longitudinal direction of a cabinet block.

FIG. 3 is a schematic perspective view showing a configuration of a moving-side cassette mold.

FIG. 4 is an exploded perspective view of a slide unit 46d arranged along a long side of a core block.

FIG. 5 is a schematic cross-sectional view showing a configuration for urging the slide unit to move to a retracted position.

FIG. 6 is a schematic cross-sectional view showing the positional relationship between the slide unit and the locking block when the mold is at the mold opening position.

FIG. 7 is a schematic cross-sectional view showing the positional relationship between the slide unit and the locking block when the mold is at the mold clamping position.

[Explanation of symbols]

10: Fixed side cassette mold 14: Cavity block 16a, 16b, 16c, 16d: locking unit 24: Dovetail groove member 28: inclined surface 30: Dovetail 40: Moving side cassette mold 46a, 46b, 46c, 46d: slide unit 54: inclined surface 56: Yes member

Claims (6)

[Claims] 1. A first die attached to and joined to one of first and second dies capable of relatively moving relative to each other and joining.
And a slide core means reciprocating between an advance position close to a cavity formed between the second mold and a retract position separated from the cavity, and the first and second molds. A slide mechanism of an injection-molding die, comprising: a lock means attached to the other and locking the slide core means at the forward position, wherein the slide core means and the lock means each include an inclined surface. , The inclined surfaces are configured to come into contact with each other when the molds relatively approach each other to move the slide core means to the advanced position, and are provided along one of the inclined surfaces. A dovetail groove is provided along the other of the inclined surfaces, and the dovetail groove is configured to be fitted into the dovetail groove while the inclined surface is in contact with the dovetail groove. Slide mechanism. 2. The slide mechanism according to claim 1, wherein the slide core means includes a slide core and a slide unit connected to the slide core, and the inclined surface is formed on the slide unit. 3. The slide mechanism according to claim 1, wherein the dovetail is formed on a dovetail member attached along the inclined surface. 4. The slide mechanism according to claim 1, wherein the dovetail groove is formed in a dovetail groove member attached along the inclined surface. 5. The slide mechanism according to claim 1, further comprising a biasing unit that biases the slide core unit toward a retracted position. 6. A first and a second cassette molds which are movable relative to each other and can be joined together, and which are attached to one of the first and the second cassette molds,
Slide core means capable of reciprocating between an advanced position close to a cavity formed between the joined first and second cassette molds and a retracted position away from the cavity; And a second mold, which is attached to the other of the second molds, and is provided with a locking means for locking the slide core means in the forward movement position, wherein the slide core means and the locking means are respectively An inclined surface, wherein the inclined surface is configured to abut each other during relative movement of the mold to move the slide core to the forward position, and is provided along one of the inclined surfaces, A dovetail groove is provided along the other of the inclined surfaces, and the dovetail groove and the dovetail groove are configured to be fitted to each other during contact of the inclined surface. Mold.