JP2999705B2 - Mold equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold apparatus for self-holding a clamping force between a pair of molds.

[0002]

2. Description of the Related Art Conventionally, in order to respond to mass production requirements, for example, a plurality of mold apparatuses having a pair of molds are arranged on a rotary table which rotates around a horizontal or vertical axis, and a plurality of molds are formed by one injection apparatus. 2. Description of the Related Art Some devices sequentially inject an injection material. In such a case, it is necessary that each mold device can self-hold the clamping force against the pressure of the injection material or the like.

For example, in Japanese Unexamined Patent Publication No. 4-294116, as shown in FIG. 8, a bolt 3 is screwed into a bolt hole 4 to hold the clamping force between the dies 1 and 2 by itself. It has become. Also, Japanese Patent Application Laid-Open No. 6-32851
No. 8 discloses, as shown in FIG.
The lock plates 5 and 5 and the actuator 6 are attached to one mold 2, and the lock plates 5 and 5 are actuated by the operation of the actuator 6.
The mold clamping force between the molds 1 and 2 is self-maintained by rotating the mold 5 and engaging the notches 7 and 7 formed in the other mold 1.

[0004]

However, in Japanese Patent Application Laid-Open No. 4-294116, the thread of the bolt may be damaged at an early stage due to biting or the like, and there is a problem in terms of durability. Further, according to Japanese Patent Application Laid-Open No. 6-328518, when a mold clamped and held is conveyed, a pipe or the like (not shown) for driving the actuator 6 is obstructed, and workability deteriorates.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a mold apparatus which can easily and surely hold a mold clamping force between molds with a simple configuration.

[0006]

In order to solve the above-mentioned problems, a mold apparatus according to the present invention has a pair of molds which are in surface contact with each other at a divided surface during mold clamping, and at least one of the molds is provided. On the outer side surface, protruding portions protruding from and protruding along the outer edge near the outer edge of the dividing surface, respectively, are provided. At least one is formed in a tapered shape along the longitudinal direction of the projection, and a holding member fitted to both projections via an engagement groove is slidably provided along the longitudinal direction of the projection. Each inner surface of the engaging groove facing the engaging surface is formed at substantially the same angle as each engaging surface.

[0007] With this configuration, in a state where both the molds are closed, the holding member is moved in the longitudinal direction of the projection until the inner surface of the engagement groove is held in a state of being pressed against the engagement surface of the projection. By sliding in the tightening direction along the direction, the mold is securely held between the two dies. On the other hand, when removing the molded product by releasing both molds, the holding member is slid in the direction opposite to the mold clamping, that is, in the pulling direction, so that the inner surface of the engagement groove is separated from the engagement surface of the projection. The molds are released from each other, and the clamped state of each mold is released.

Since the holding member is slid along the longitudinal direction of the protruding portion to perform the mold clamping and releasing operations, the operation is easy and the structure of the apparatus itself is simplified. You.

According to the second aspect of the present invention, both engagement surfaces are
The tapered surfaces are inclined symmetrically with respect to the division surface. Then, both engagement surfaces are set at a predetermined angle, for example, 3 degrees to 5 degrees.
By inclining the holding member in the tightening direction by attaching the holding member in the tightening direction, the detachment force for removing the holding member in the pull-out direction is sufficiently ensured by inclining the holding member in the tightening direction.
Therefore, for example, even when an impact or the like acts on the holding member in the mold device that is clamped and held, the holding member is unlikely to move in the pull-out direction, and the mold device is stably clamped and held.

According to the third aspect of the present invention, the guide means for guiding the holding member along the longitudinal direction of the projection is provided between the mold and the holding member. For example, a guide member that is attached to a mold and meshes with the holding member is used as the guide means. In this case, the holding member does not come off the mold, and workability is improved.

According to the fourth aspect of the present invention, the guide member is formed on the inner surface of the holding member so as to protrude inward.
A guide groove in which the guide protrusion is fitted is formed on the engagement surface of the protrusion, so that the holding member is reliably prevented from dropping from the mold.

The hardness of the projection and the holding member is preferably about HRC (Rockwell hardness) of about 60 or more.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments.

FIGS. 1 to 3 show a mold apparatus 20 according to a first embodiment of the present invention. This mold apparatus 20 is used in an injection molding machine 10 for injection molding a rubber molded product shown in FIG. .
In the injection molding machine 10, a plurality of mold devices 20 are used for one injection device 11. Each mold device 20
During the molding operation, the sheet is conveyed to the injection device 11, the molding device 12, and the attaching / detaching device 15, and the clamping force at the time of this conveyance can be held by itself.

As shown in FIGS. 1 to 3, the mold apparatus 20 includes a pair of molds, ie, an upper mold 22a and a lower mold 22b.
And metal holding members 50, 50 for holding a mold clamping force between the upper mold 22a and the lower mold 22b.
, Guide members 42, 42 slidably supporting the holding members 50, 50 are fixed via two mounting bolts 44, respectively. In FIG. 2, the right side is the one end side A and the left side is the other end side B in FIG.

The upper mold 22a is formed by attaching a thin mounting plate 24a to a rectangular mold portion 26a, and the lower mold 22b is similarly constituted by attaching a thin mounting plate 24b to a mold portion 26b. You. The opposing lower surface and upper surface of each of the mold portions 26a, 26b are separated from each other by a divided surface
a and 28b.

As shown in FIG. 3, recesses 30a, 3 which are open to the divided surfaces 28a, 28b are formed in the respective mold portions 26a, 26b.
0b is formed, and these recesses 30a and 30b define a cavity C into which a rubber material is injected and molded. A supply passage 32 for supplying a rubber material as an injection material to the cavity C is formed through the upper die 22a.

Outer side surfaces 34a, 34a on both sides of upper mold 22a
Are formed on the outer side surfaces 34b, 34b on both sides of the lower mold 22b, respectively. Here, for convenience, the configuration mainly on one of the outer side surfaces 34a and 34b (the front side in FIG. 1) will be described.

Each of the projections 36a and 36b is
a, 28b extending along the outer edges 29a, 29b, and the outer surfaces 34a, 3 of the upper mold 22a and the lower mold 22b.
4b is formed so as to protrude in the same width from the divided surfaces 28a, 28b.
The shapes are mutually symmetrical with respect to b. Opposite lower surface 38a and upper surface 38b of each protrusion 36a, 36b
Are in the same plane as the dividing surfaces 28a and 28b.

The upper surface and the lower surface opposite to the lower surface 38a and the upper surface 38b respectively have tapered engagement surfaces 40a and 40b which are continuously inclined in the longitudinal direction of the projections 36a and 36b.
It has become. The engagement surfaces 40a, 40b are both tapered from the one end side A to the other end side B at the same angle in a direction gradually separating from the divided surfaces 28a, 28b. From the one end A to the other end B
It is continuously increasing toward.

The holding member 50 extends over both outer side surfaces 34a and 34b adjacent to each other at the outer edges 29a and 29b.
Is provided movably in the direction of arrow P. Holding member 50
An engagement groove 52 having a shape corresponding to the projections 36a and 36b is formed on the inner side surface of the, and the engagement groove 52 gradually widens from one end A to the other end B. At the end side B, the holding member 50 is opened outward from the side surface. That is, the upper surface 54 of the engagement groove 52 faces the engagement surface 40a and is inclined at substantially the same angle as the engagement surface 40a, and the lower surface 56 of the engagement groove 52 faces the engagement surface 40b and It is inclined at substantially the same angle as the surface 40b.

The width between the engagement surfaces 40a and 40b near the one end A is smaller than the width between the engagement surfaces 40a and 40b near the other end B, and the upper surface 54 and the lower surface 56 of the engagement groove 52 are Engaging surfaces 40a, 40 of corresponding projections 36a, 36b
It is longer than b. Thereby, when the holding member 50 moves to the other end side B side, the engagement surfaces 40a and 40b and the upper surface 54 and the lower surface 56 of the engagement groove 52 are securely pressed against each other.

A notch 62 is formed at the upper edge of the other end B of the holding member 50 so that the protrusion 36a can easily pass through when the upper mold 22a is attached or detached.

The guide member 42 is mounted on the lower mold 22b via mounting bolts 44. The guide member 42 is connected to one end A of the lower mold 22b so as to reliably support the holding member 50 even when the holding member 50 is located at the most end A.
It protrudes further outward than the side of.

The inner surface of the guide member 42 is formed in a U-shaped cross section. The guide groove 42 is formed below the holding member 50 in a guide groove 46 defined by the inner surface and the outer surface 34b of the lower mold 22b. The engaging portions 58 having a U-shaped cross section are engaged with each other.
Thus, the holding member 50 is supported by the guide member 42 so as to be movable only in the direction of the arrow P.

A falling-off prevention pin 48 is attached to the guide member 42 so as to be located near one end A.
The tip of 8 protrudes into the guide groove 46. On the other hand, the engagement projections 60 are formed at both ends of the engagement portion 58 so as to protrude therefrom.
The holding member 50 is prevented from falling off to the one end A.

FIG. 4 is a front view of the attaching / detaching device 15 in which the mold clamping and releasing operations of the mold device 20 are performed. With reference to FIG. 4 and FIGS. 1 to 3, the mold clamping and releasing operations of the mold apparatus 20 will be described.

Before the mold is clamped, the lower mold 22b is fixed on the table 19 in advance, and the holding member 50 is brought to the one end A (the state shown in FIGS. 2 and 4). ing. Then, the upper mold 22 is operated by the operation of the mold clamping cylinder 16.
a and the lower mold 22b are clamped at a predetermined pressure.

In this state, the holding members 50, 50 are pressed against the other end B with a predetermined mounting force by the two tightening cylinders 17 located at one end A. Thereby, the holding member 5
0, 50 move to the other end side B, and the engaging surfaces 40a, 40b and the upper surface 54, the lower surface 56 are pressed and held, and the holding members 50,
50 becomes a wedge to hold the mold between the upper mold 22a and the lower mold 22b.

On the other hand, at the time of releasing, the holding members 50, 50 are respectively pressed from the other end B to the one end A by the two releasing cylinders 18. Thereby, the holding member 50,
50 is slid from the other end B to the one end A,
a, 40b and the upper surface 54 and the lower surface 56 are separated from each other.
The space between the lower mold 2a and the lower mold 22b is released from the mold clamping state. Thereafter, the lower die 22ba is lowered, and the molded product in the cavity C is extracted.

As described above, in this embodiment, the holding members 5 are provided by the cylinders 17 and 18 disposed on both sides of the mold apparatus 20.
Since the mold device 20 can be clamped and held or released from the clamped state only by pressing 0 in the horizontal direction (the direction of arrow P), the mold clamping and releasing operations are easy. The device itself can be simplified.

In FIG. 2, the holding member 50 is pressed in the horizontal direction perpendicular to the mold clamping force to hold the mold clamping against the mold clamping force acting in the vertical direction. Can self-hold power.

Next, the molding operation of the injection molding machine 10 using the mold apparatus 20 of this embodiment will be described with reference to FIG.

The mold apparatus 20 clamped and held by the attachment / detachment apparatus 15 is conveyed onto the rotary table 13 of the molding apparatus 12 via the moving apparatus 14, and the rotary table 13 is rotated clockwise so that the injection apparatus is rotated. 11 is transferred.

In the injection device 11, a rubber material is injected into the cavity C of the mold device 20 through the supply passage 32, and the mold device 20 into which the rubber material has been injected is formed by the molding device 12.
Is conveyed on the turntable 13. In the molding device 12, the mold device 20 is vulcanized while being conveyed with the rotation of the rotary table 13, and is conveyed into the attaching / detaching device 15 via the moving device 14 after the vulcanization operation is completed.

In the attaching / detaching device 15, the molded product in the cavity C is extracted as described above, and after being subjected to a cleaning process and the like,
The mold is held again. The mold device 20 is again conveyed to the injection device 11 via the rotary table 13, and the rubber material is injected. By repeating such an operation, an injection molded product is formed continuously.

FIG. 6 shows the holding member 50 when the taper angles θ of the engagement surfaces 40a, 40b are 3, 5, and 8, respectively.
2 shows the relationship between the mounting force and the detaching force of the device. Here, the taper angle θ is determined by dividing the engagement surfaces 40a, 40b into the divided surfaces 28a, 28b.
The mounting force indicates a force pressing the holding member 50 in the tightening direction, and the detaching force indicates a force for extracting the holding member 50 held by the mold clamping in the pulling direction. The protrusions 36a, 3 of the upper mold 22a and the lower mold 22b
The hardness of 6b and the holding member 50 is about 60 HRC (Rockwell hardness).

As is apparent from the figure, the taper angle θ is 3
When the angle is between 5 degrees and 5 degrees, the detaching force that satisfies the requirement for the mounting force is maintained, and even when an impact or the like acts on the holding member 50 of the mold device 20 that is clamped and held, the holding member 5
0 does not move in the pulling direction, and the mold apparatus 20 is stably held by the mold clamping.

Since the holding member 50 is engaged with the guide member 42 fixed to the lower mold 22b, for example, the upper mold 22
a, It does not come off in the direction away from the lower mold 22b.

FIG. 7 is a partial sectional view showing a mold apparatus according to a second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the second embodiment, a member corresponding to the guide member 42 of the first embodiment is not provided, and the holding member 50 is not provided.
Guide projection 70 projecting inward from the periphery of the engagement groove 52 of FIG.
Are formed so as to protrude along the longitudinal direction of the protrusions 36a and 36b. Guide grooves 72a, 72b corresponding to the guide protrusions 70 are formed on the base end side of the protrusions 36a, 36b. The guide projections 70, 7 are provided in the guide grooves 72a, 72b.
0, the holding members 50, 50 are
2a and the lower mold 22b are prevented from falling off.

[0042]

As described above, according to the present invention, by sliding the holding member along the longitudinal direction of the projection, the engagement surfaces of the adjacent projections and the inner surface of the engagement groove of the holding member are formed. It is possible to securely hold the mold clamping force between the dies by press-contact, so that the work is easy and the device itself is simplified.

When both engagement surfaces are inclined at an angle of 3 to 5 degrees with respect to the division surface, a desired detaching force is maintained with respect to the mounting force of the holding member. Even if an impact or the like acts on the holding member of the mold device, the holding member does not come off and the mold is more securely held between the two dies.

Further, when a guide member for supporting the holding member slidably along the longitudinal direction of the projection is attached to the mold, the holding member does not come off from the mold and the workability is excellent. I have.

On the other hand, if guide projections projecting inward are formed on the inner surface of the holding member, and guide grooves into which the guide projections are fitted are formed on both engagement surfaces of the projections, the holding member may fall out of the mold. Is reliably prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a mold apparatus according to a first embodiment of the present invention.

FIG. 2 is a side view of the mold apparatus of FIG.

FIG. 3 is a front view of the mold apparatus of FIG. 1;

FIG. 4 is a view showing an attaching / detaching device of the mold device of FIG. 1;

FIG. 5 is a view showing an injection molding machine using the mold apparatus of FIG. 1;

FIG. 6 is a diagram showing a relationship between a mounting force and a detaching force of the mold device of FIG. 1;

FIG. 7 is a sectional view of a mold apparatus according to a second embodiment of the present invention.

FIG. 8 is a perspective view showing a conventional mold.

FIG. 9 is a partially cutaway view showing a conventional mold.

[Explanation of symbols]

 Reference Signs List 20 mold device 22a upper mold (die) 22b lower mold (die) 28a, 28b split surface 29a, 29b outer edge 34a, 34b outer surface 36a, 36b protrusion 40a, 40b Engagement surface 42 Guide member 50 Holding member 52 Engagement groove 54 Upper surface (inner surface) 56 Lower surface (inner surface)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-51-79160 (JP, A) JP-A-51-69561 (JP, A) JP-A-60-234810 (JP, A) JP-A-60-234 234811 (JP, A) JP-A-8-1741 (JP, A) JP-A-8-66950 (JP, A) JP-A-53-130777 (JP, A) JP-A-60-92817 (JP, A) JP-A-2-214635 (JP, A) JP-A-3-34809 (JP, A) JP-A-4-294116 (JP, A) JP-A-5-50466 (JP, A) JP-A-6-328518 (JP, A) Real opening 58-71457 (JP, U) Real opening 54-98870 (JP, U) Real opening 59-122217 (JP, U) Real opening 2-44012 (JP, U) open flat 5-29713 (JP, U) JitsuHiraku flat 6-64820 (JP, U) JitsuHiraku flat 4-47514 (JP, U) (58 ) investigated the field (Int.Cl. ⁷ DB name) B29C 33/20 B29C 45/64

Claims (4)

(57) [Claims] 1. A mold having a pair of molds which are in surface contact with each other at a split surface during mold clamping, and at least one outer surface of each mold has
Protrusions each protrudingly provided along the outer edge while being close to the outer edge of the division surface are provided, and at least one of the two engagement surfaces on the opposite side of the division surface side of both opposing projections. One is formed in a tapered shape along the longitudinal direction of the projection, and a holding member fitted to both projections via an engagement groove is slidably provided along the longitudinal direction of the projection. A mold apparatus, wherein each inner surface of the engagement groove facing the both engagement surfaces is formed at substantially the same angle as each engagement surface. 2. The mold apparatus according to claim 1, wherein the two engagement surfaces are tapered surfaces that are symmetrically inclined with respect to the division surface. 3. The mold according to claim 1, wherein guide means for guiding the holding member along the longitudinal direction of the projection is provided between the mold and the holding member. apparatus. 4. A guide projection extending inward on both inner surfaces of the holding member, and a guide groove into which the guide projection fits is formed on both engagement surfaces of the projection. The mold apparatus according to claim 1, wherein