JPH0371250B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an insert mold for injection molding resin into an insert work.

[Conventional technology]

BACKGROUND ART Recently, for example, injection molding of resin into a predetermined portion of an insert work made of metal is frequently performed.

FIG. 7 shows an example of an insert work that is insert-molded, and in this example, the screw 11
A resin fixing piece 15 is formed on the head 13 of.

In this type of insert work, resin is injection molded into a resin fixing piece 15 using an insert molding machine, and as shown in FIG. is formed as.

Conventionally, when insert molding such a product, a simple robot or a special robot is used to insert the insert work into an injection mold.

[Problem that the invention seeks to solve]

However, inserting the insert work into the injection mold requires high positioning accuracy, which causes the problem that the structure and control of the robot becomes complicated and the equipment becomes large-scale.

[Purpose of the invention]

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide an insert mold that can accurately and efficiently supply an insert work to the mold.

[Means for solving problems]

The present invention provides an insert mold for injection molding a resin into an insert work, in which a plurality of support parts are formed at a certain angle from the center to support the insert work, and are indexable at the certain angle. A mold provided with an index table and an injection molding part that is arranged at an index stop position of the support part on one side of the index table and forms a cavity into which the insert work is inserted together with the index table. It is arranged on the other side of the member and the index table, and guides the insert work to the indexing stop position during the indexing operation of the index table, and also guides the molded product formed in the mold member to the indexing position. It has a guide device for discharging it outside the table.

[Action of the invention]

In the present invention, the insert work supplied to the support part of the index table is guided by the guide device as the index table rotates, moves to the index stop position, and is moved together with the index table at this position. The required parts are inserted into the cavity of the clamped mold member and combined with the resin injected into the mold member to form a molded product. As the index table rotates, the molded product is guided by the guide device and automatically moved to the ejection position, where it is ejected out of the index table. In this way, the insert work is efficiently supplied and discharged from the injection molding section by the operation of the index table and the guide device.

[Embodiments of the invention]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, details of the present invention will be described with reference to an embodiment shown in the drawings.

FIG. 1 shows an insert mold according to an embodiment of the present invention. In the figure, reference numeral 21 is a disc-shaped index table, and on its outer periphery,
A support portion 25 consisting of four V-shaped notches that supports the insert work 23 is formed at an angle of 90 degrees from the center.

Above one side of this index table 21 is a mold member 31 consisting of an upper mold 27 and a lower mold 29.
is located. The lower mold 29 of this mold member 31
As shown in FIG.
An injection molding part 58 forming a cavity 31a for molding resin is formed at a position above the indexing stop position of the support part 25. This injection molding part 58 has a resin flow path 41b in the center of the lower mold 29.
The nozzle bush 41a, which is opened in the side of the mold member 31, communicates with the nozzle bush 41a through a resin introduction path 41 provided at the interface between the upper and lower molds.

Further, the nozzle bush 41 of the mold member 31
On the a side, an injection device is arranged which brings an injection nozzle 43 into contact with the nozzle bush 41a, injects resin into the resin introduction path 41 of the mold member 31, and supplies the resin to the injection molding section 58.

An insert work supply device 33 is disposed on the side outer circumference of the index table 21, the end of which is set at a position slightly higher than the index table 21, and which supplies the insert work 23 to the support section 25 of the index table 21. has been done.

On the lower surface of the index table 21, a guide plate (guiding device) 39 having a guide groove 37 for guiding the insert work 23 placed on the support portion 25 of the index table 21 is mounted on the fixed plate 47 via a spacer 45. They are fixed and arranged as one piece.

The guide groove 37 formed in the guide plate 39
For example, as shown in FIG.
It is formed in the radial direction opening at the outer circumferential part of the molded product ejecting part 9, and is formed in an arc shape with a predetermined radius from position C to position A on the injection molding part side, and from position A on the injection molding part side to the molded product discharge part. The groove is formed to be inclined gradually toward the outer peripheral opening toward the side position B, and the groove depth is gradually made shallower from the position A to the position B, as shown in FIG. Therefore,
Insert work 2 of index table 21
3 will be moved upward during this period.

At the center of the guide plate 39 and the fixed plate 47, a rotary shaft 49 is rotatably supported vertically via bearings 49a and 49b.

A one-way clutch 51 is attached to this rotating shaft 49.
A pinion 53 is fitted to be able to rotate relative to the rotary shaft 49 via a rack.As shown in FIG. 55 is engaged.

The rotating shaft 49 projects upward from the guide plate 39, and the index table 21 is attached to this projecting portion.
are fitted and connected by a key 57 and a nut 49c. Then, the pinion 53 reciprocates due to the reciprocating motion of the hydraulic cylinder 59, and the rotating shaft intermittently rotates in one direction via the one-way clutch 51. As a result, the index table 21 is rotated at a 90 degree angle on the guide plate 39. It is designed to be indexed and rotated.

An insert work holding device 35 is provided on the indexing stop position side of the support portion 25 . This insert work holding device 35 includes a cylinder 35b supported by a bracket 35a fixed to the side of a guide plate 39, and this cylinder 3.
A pressing member 6 is attached to the rod 5b and has a triangular shape corresponding to the V-shaped groove of the support portion 25.
1, and a plunger 63 that is movably fitted in the center of this holding member 61 in the axial direction and is elastically biased outward by a spring or the like, and when the support part 25 of the index table 21 is at the indexing stop position. By the operation of the cylinder 35b, the holding member 61 fits into the V-shaped groove of the support part 25 and positions it on the index table 21, and the insert work 2 supported by the support part 25 is positioned.
The screw portion 11 of No. 3 is pressed against the support portion 25.

FIG. 6 shows a mold clamping device for clamping the mold 31, index table 21, etc. In the figure, reference numeral 69 denotes a fixed side mold mounting plate that is appropriately fixed to a pedestal (not shown), and is mounted at regular intervals. Four tie bars 67, which are arranged opposite to each other, pass through the fixed side mold mounting plate 69 and are supported so as to be vertically movable.

A movable mold mounting plate 65 is fixed to the upper end of the tie bar 67 at a predetermined distance from the fixed mold mounting plate 69, and a pressure plate 70 is mounted to the lower end of the tie bar 67. A hydraulic cylinder 71 provided between the movable mold mounting plate 65 and the fixed mold mounting plate 69 moves the movable mold mounting plate 65 up and down via the pressurized plate 70 and the tie bar 67.

On the stationary mold mounting plate 69 of this mold clamping device, a stationary plate 47 having the guide plate 39 and supporting the index table 21 thereon is fixed with bolts or the like. An upper mold 27 of the mold member 31 is fixed to the lower surface of the movable mold mounting plate 65, and a lower mold 29 is connected to the upper mold 27 below the upper mold 27 via a support bar 72. They are suspended and supported at predetermined intervals so that they can be freely moved toward and away from each other.

In the insert molding machine configured as described above, as shown in FIG. By indexing rotation of the index table 21, which rotates intermittently by 1/4 through the rack 55 and pinion 53, the threaded portion is guided by the guide groove 37 of the guide plate 39, and the mold member 31 is automatically injected. It is moved below the molding section 58 and stopped there. When the cylinder 35b of the insert work holding device 35 is activated, the holding member 61 moves forward and fits into the V-shaped groove of the support portion 25 of the index table 21, thereby positioning the index table 21. At the same time, the insert work 23 supported by the support portion 25 at the indexed position is held in a positioned and fixed state by the tip of the pressing member 61.

Thereafter, the mold clamping device is activated, and the movable mold mounting plate 65 is moved downward by the hydraulic cylinder 71 as the tie bar 67 is lowered. As a result, the mold member 31 is separated from its upper mold 27 and lower mold 2.
The lower mold 29 is lowered by a predetermined distance with the lower mold 29 separated from the lower mold 29.
After contacting the index table 21, the upper die 27 and the lower die 29 approach each other, and finally come into close contact with each other, together with the index table 21, the guide plate 39, the spacer 45, and the fixing plate 47. , movable side mold mounting plate 65 and fixed side mold mounting plate 6
The mold is clamped between 9 and 9.

After this, the nozzle 43 of the injection device
The nozzle pusher 41a of the nozzle 43
From there, resin is injected into the resin introduction path 41 of the mold member 31. The resin injected into the resin introduction path 41 is introduced into the cavity 31a through the flow path 41b, and is molded and fixed around the resin fixing piece 15 of the insert work 23.

On the other hand, after the above molding, the nozzle 43 of the injection device separates from the mold member 31, and the index table 2 is moved by the insert work holding device 35.
1 is released, the movable mold mounting plate 65 moves upward together with the tie bar 67 due to the operation of the mold clamping device, the mold member 31 is separated from the index table 21, and the upper mold 27 and lower mold 29 are separated from each other. are separated, and the sprue runner inside the mold member 31 is discharged by a take-out machine.

Thereafter, the hydraulic cylinder 59 is operated again to index and rotate the index table 21, and the molded insert work 23 is moved to the discharge section while being supported by the support section 25. At this time, as shown in FIGS. 1 and 4, the insert work 23 gradually moves upward along the guide groove 37 of the guide plate 39, and also moves toward the outer periphery of the index table 21. It naturally falls into the insert work removal section.

In the insert mold configured as above,
A mold consisting of a mold member 31, an index table 21, a guide plate (guiding device) 39, etc. is installed in the mold clamping device, and the insert work 23 is supported by the index table 21 and rotated for indexing. , is automatically supplied to the injection molding section 58 of the mold member 31, and after being stopped and positioned there,
The resin is injection molded into a predetermined portion of the insert work 23, and after molding, it is taken out from the injection molding section 58 as the index table 21 rotates, so that special equipment such as a robot is required to handle the insert work 23. There is no need for an operating device or a setting space, and the simple structure allows the insert work 23 to be reliably supplied to the injection molding section 58 of the mold member 31, and also to be reliably discharged from there. Accordingly, it is possible to provide an insert mold that can be used for various purposes, is inexpensive, and improves the productivity of an insert molding machine.

〔Effect of the invention〕

As described above, according to the present invention, a plurality of support parts are formed to support an insert work at a certain angle from the center of the insert mold, and an index table that can be indexed at a certain angle; a mold member provided with an injection molding part that is disposed at an index stop position of the support part on one side of the index table and forms a cavity into which the insert work is inserted together with the index table; A guide device disposed on the other side of the table, which guides the insert work to the indexing stop position during the indexing operation of the index table, and also discharges the molded product formed in the mold member to the outside of the index table. Since it is configured with
We have developed an insert mold that can be efficiently and reliably discharged by the indexing rotation of the index table and the action of the guide device, has a simple structure, is inexpensive, and can improve the productivity of the insert molding machine. It has the advantage of being able to provide

[Brief explanation of drawings]

Fig. 1 is a perspective view of the main parts of an embodiment of the insert mold of the present invention, Fig. 2 is a longitudinal cross-sectional view showing the assembled state of the insert mold of Fig. 1, and Fig. 3 is a view of Fig. 2. 4 is a longitudinal sectional view showing the guide groove of the guide plate shown in FIG. 2, FIG. 5 is a top view showing the insert work holding member shown in FIG. 1, and FIG. 6 is a top view showing the insert work holding member shown in FIG. 1. FIG. 7 is a perspective view showing an example of an insert work, and FIG. 8 is a perspective view showing an insert molded insert work. 21... Index table, 23... Insert work, 25... Support part, 31... Injection mold, 58... Injection molding part.

Claims (1)

[Claims] 1. An index table in which a plurality of support parts for supporting the insert work are formed at a certain angle from the center and that can be indexed at the certain angle, and the support part on one side of the index table. a mold member disposed on the other side of the index table and provided with an injection molding part that forms a cavity into which the insert work is inserted together with the index table; An insert mold comprising a guide device that guides an insert work to an index stop position during indexing operation of the table and discharges a molded product formed in a mold member to the outside of the index table.