JPH07178771A - Insert mold - Google Patents

Abstract

PURPOSE:To provide an insert mold performing the taking-out of a product and the mounting of an insert metal fitting in parallel. CONSTITUTION:A mold is constituted of three members, that is, a runner plate 5 made movable with respect to an upper attaching plate 1 mounted on a molding machine fixing side and mold movable sides 9 mounted on the mold fixing side and a molding machine moving side and a means supplying and mounting the mold pin 3 protruding from the rear surface of the runner plate 5 or merely supplying and mounting an insert metal fitting is provided to the space formed between the mold fixing side and the runner plate 5 at the time of mold opening. In this mold, since the taking-out of a product is performed on a fallen mold movable side and the mounting of the insert metal 21 fitting is performed on the rear surface side of the runner plate 5, both operations can be parallelly advanced at the same time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold, and more particularly to an insert molding mold.

[0002]

2. Description of the Related Art To embed a metal part (insert metal fitting) in a molded part such as synthetic resin, place the insert metal fitting at a predetermined position in the mold with the mold for molding open before molding. , Close the mold and perform molding (insert molding). In this insert molding, if the insert metal fitting is not sufficiently attached to the mold, the mold may be damaged. The mounting of the above-mentioned insert metal fittings is desired to be automated in terms of insertability and holding after insertion, but automation of mounting is only practically used in a vertical molding machine,
In horizontal molding machines, insert fittings are mounted manually.

[0003]

In the conventional device for mounting the insert fitting, the insert fitting is inserted from between the two when the molding die is opened. Therefore, when the shape of the product is complicated, There is also a large restriction on the insert fitting insertion portion of the mounting device, and when mounting from a parting surface to a deep position, the insertion stroke becomes long and workability is poor, which is a problem in use. Further, since the mounting of the insert fitting is performed in the step after the product is taken out from the mold, there is a drawback that the time required for mounting becomes long, the time required for the entire molding increases, and the productivity decreases.

The present invention has been made based on the above circumstances, and even if the shape of the product is complicated, the insert fitting can be easily inserted and mounted, and the insert can be performed in parallel with the removal of the product. (EN) Provided is an insert molding die which can reduce the time required for molding by proceeding with the mounting work and the mounting work for fitting.

[0005]

The insert molding die of the present invention comprises an upper fixing plate mounted on the fixing side of the molding machine, a guide pin erected on the lower surface of the fixing plate, and a metal mold having a smaller axial length. A restriction pin slidably provided on the upper fixing plate in a limited range in the axial direction in the vicinity of the mold pin and the guide pin, and the restriction pin by slidably engaging the guide pin and the mold pin. A runner plate fixedly attached to the upper mounting plate and having a through hole communicating with the resin injection port of the upper mounting plate, and a metal that is slidably engaged with each of the pins and whose range of movement is restricted by the limiting pin and the guide pin A fixed mold side, a lower mounting plate mounted on the movable side of the molding machine, and a movable mold side that is installed on the lower mounting plate and forms a molding space between the upper surface of the lower mounting plate and the lower surface of the fixed mold side. The mold fixed side and the mold movable side are The mold is opened by lowering the movable side, and a space is further formed between the upper surface of the mold fixing side and the learner plate. It is characterized in that a mechanism for sequentially supplying is provided.

[0006]

In the insert molding die of the present invention having the above-described structure, when the molding die is opened, the runner plate and the mold fixed side are lowered as the mold movable side is retracted and separated from the upper mounting plate. An open space is formed between the runner plate and the mold fixing side, and the tip of the mold pin projects from the lower surface of the runner plate into the space. Since the insert fittings can be supplied to and installed in the mold pins in the space, the product can be taken out from the mold movable side and the insert fittings can be installed in parallel.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view in a mold closed state of one embodiment of the present invention, and FIG. 2 is a sectional view in a mold open state. In these figures, a guide pin 2 and a mold pin 3 for mounting an insert fitting are planted on an upper mounting plate 1 for mounting a fixed mold on a fixed side (not shown) of a molding machine, and the guide pin 2 The limiting pin 4 is mounted so that it can move a limited distance in its axial direction in the vicinity of. A runner plate 5 and a mold fixing side 6 are slidably engaged with the pins 2 and 3 in this order from the mounting plate 1 side. A resin injection port 1a communicating with a resin discharge port of an injection device (not shown) is provided in the center of the upper mounting plate 1, and an opening 5a communicating with the resin injection port 1a is provided in the runner plate 5. . The restriction pin 4 is hung from the head 4a that engages with the large diameter portion of the stepped hole 7 provided in the mounting plate 1, the large diameter portion 4b connected to this head 4a, and the end surface of this large diameter portion 4b. The end has a small diameter portion 4c located above the lower end of the guide pin 2, and the runner plate 5 is fixed to the lower end of the large diameter portion 4b of the limiting pin 4. The limiting pin 4 is slidable within a large diameter portion of the stepped hole 7 within a range in which the head 4a can move. Stoppers 2a and 4d are attached to the lower ends of the guide pin 2 and the limiting pin 4, respectively. Further, a concave portion 6a into which the stopper 4d can be fitted is provided on the lower surface of the mold fixing side 6.

On the other hand, a lower movable plate 8 for mounting a movable mold on the movable side of the molding machine has a movable mold side 9 having a convex portion 9c having a shape corresponding to the fixed side 6 of the mold. There is. The mold movable side 9 is attached to the lower attachment plate 8 via a support frame 10. A guide hole 9a for loosely fitting the stopper 2a at the end of the guide pin 2 and a blind hole 9b for loosely fitting the stopper 4d at the end of the small diameter portion 4c of the limiting pin 4 are provided on the movable side 9 of the mold. ing.
The stopper 2a is a lower surface of the mold movable side 9, and the stopper 4d is a concave portion 6a provided on the bottom surface of the mold fixed side 6.
Cooperates with the upper surface of each to perform the operations described later.

In FIG. 1 and FIG. 2, 11 is the inlet 5a of the runner plate 5 and the openings 6b, 6 of the mold fixing side 6.
Runners having protrusions 11a and 11a formed by b, 12 is a knockout bar for taking out the product after molding, 13 is a guide bush for guiding the mold pin 3, and 14 is a runner plate 5 and mold fixed side. 6, a spring engaged with the small diameter portion 4c of the restriction pin 4, 15 is a space formed by the concave portion 6c of the mold fixed side 6 and the convex portion 9c of the mold movable side 9, in other words, Shows the shape of each product.

In the molding die of the embodiment having the above structure, resin is injected into the space 15 and molding is performed when the mold is closed as shown in FIG. Then, when the mold is opened as shown in FIG. 2, the movable mold side 9 is lowered together with the lower mounting plate 8 attached to the movable side of the molding machine, and accordingly, the fixed mold side 6 is lowered along the guide pin 2 and the limit pin 4. And its lower surface is stopper 2
It stops at the position where it contacts a and 4d. At this time, the space between the runner plate 5 and the mold fixing side 6 is opened, and the lower end of the mold pin 3 is projected to the lower surface of the runner plate 5. At the movable mold side 9 that has descended, the product is taken out by the knockout bar 12. In addition, the runner 11 is removed from the mold fixing side 6.
During the removal of the product and the removal of the runner, the space between the runner plate 5 and the mold movable side 9 is opened as described above, and the lower end of the mold pin 3 is projected from the lower surface of the runner plate 5. It is possible to supply and mount the insert fitting to the mold pin 3 in parallel with the taking out and removing.

The mounting of the insert fitting on the die pin 3 is performed as follows. 3 (a) is a plan view of the insert fitting supply device, FIG. 3 (b) is a partially cutaway side view of a main portion thereof, and FIGS. 4 (a) and 4 (b) are closed states of the insert fitting holding block. Sectional views in the open state, FIGS.
(D) is a typical sectional view showing in order an insertion state of a metallic mold pin of an insert metal fitting. Note that FIG. 5A to FIG.
In (d), the insert fitting holding block is omitted for simplicity of illustration.

3 (a) and 3 (b), the insert fittings 21 are aligned by a parts feeder (not shown) and fed along the inside of the parts guide 22. At the end of the parts guide 22, there is provided a feed plate 25 for separating the sent insert metal fittings 21 one by one and feeding them into the supply cylinder 24 shown in FIG. 3B. The feed plate 25 has a fan shape with an apex angle of 90 °, and a notch 25a for engaging the insert fitting 21 is provided at one outer end of the radius. Further, a shutter 26 for opening and closing the notch 25a by engaging and disengaging the operating protrusion (not shown) is provided at the radius. The feed plate 25 has a first position where the notch 25a faces the end of the parts guide 22, and
As will be described later, the shutter 26 is reciprocally rotated to and from a second position which is circumferentially separated by 90 ° from the position, and the shutter 26 is opened at the first position and closed when the insert fitting 21 is supplied. . Further, the shutter 26 is opened when the feed plate is rotated to the second position.

The supply cylinder 24 is provided immediately below the second position of the feed plate 25. That is, the insert fitting 21 sent along the parts guide 22 separates the insert fittings 21 one by one from the end of the parts guide 22 and carries them to the second position (immediately above the supply cylinder 24). Here, the shutter 26 is opened and the insert fitting 2
1 is dropped into the supply cylinder 24. Air for transportation is blown into the lower end of the supply cylinder 24 from one side as indicated by an arrow 27, and the insert metal fitting 21 is conveyed by the air and the insert metal fitting shown in FIGS. 4 (a) and 4 (b). It is sent to the holding block 28.

4 (a) and 4 (b), the insert fitting holding block 28 includes a fixed block 28a attached to the side surface of the runner plate 5 and a movable block attached to the side surface of the mold movable side 6. It has a side block 28b. The movable block 28b has an upper surface portion that forms a gap between the movable block 28b and the fixed block 28a when closed, and a lower surface portion that also closely contacts the fixed block 28a when closed. The insert fitting holding block 28 is opened / closed as the molding die is opened / closed. 4A shows a closed state, and FIG. 4B shows an open state. The supply cylinder 24 is sent to the fixed side block 28a of the holding block 28 in the closed state by the air,
It abuts on the movable block 28b, is supported by the lower surface portion, and stops. In the closed state of the insert fitting holding block 28 of FIG. 4A, the transfer cylinder shown as 29 in FIGS. 5A to 5D and attached to the side surface of the runner plate 5 operates. The transfer cylinder 29 is attached to the side wall of the output shaft 30a of the elevating cylinder 30 in the operation direction of the mold opening / closing direction.

A bifurcated elastic pin 31 shown in FIG. 6 is attached to the tip of the output shaft 29a of the transfer cylinder 29. When the cylinder 29 is operated as described above, the output shaft 29a thereof is moved forward, and the elastic pin 31 holds the insert metal fitting 21 which is held and positioned by the insert metal fitting holding block 28. When the mold is opened, Fig. 4
As shown in (b), the fixed block 28a and the movable block 28b are opened. As a result, the insert fitting 21
Is transferred to the output shaft 29a of the cylinder 29.

With the molding die open, the output shaft 29a of the transfer cylinder 29 is advanced and the insert fitting 2 is moved.
When 1 is located directly below the mold pin 3, it stops (FIG. 5 (b)). Here, the lifting cylinder 30 is operated and the transfer cylinder 29 is lifted. As a result, the insert fitting 21 is moved to the tip of the mold pin 3 having the structure shown in FIG. 7. The transition of the insert fitting 21 is performed as follows. In FIG. 7, a spring pin 32 having a diameter smaller than that of the die pin 3 and having an axial cut 32a in the circumferential direction is projected at the center of the tip end face of the die pin 3. The opening at the center of the insert fitting 21 is fitted into the spring pin 32 by the ascent of the transfer cylinder 29. By the way, the elasticity of the spring pin 32 at the time of fitting is stronger than the elasticity of the bifurcated elastic pin 31 sandwiching the insert fitting 21. With this arrangement, the transfer cylinder 29 moves up and the insert metal fitting 21 sandwiched between the elastic pins 31 at the tip of the output shaft 29a is fitted into the spring pin 32 at the tip of the die pin 3 and then the transfer cylinder 29. If the insert metal fitting 21 is lowered, the insert metal fitting 21 remains and moves on the spring pin 32 (FIG. 5).
(C)). If the transfer cylinder 29 is urged and the output shaft 29a thereof is retracted, the clearance between the runner plate 5 of the molding die and the die fixing side 6 is cleared (FIG. 5).
(D)).

In this state, the molding die is closed. At this time, the insert metal fitting 21 at the tip of the mold pin 3 is positioned in the space 15. Here, if the resin is injected into the molding die, the insert fitting 21 is embedded in the resin. After injecting the resin, it is cooled and solidified to open the molding die. When the mold is opened, the insert fitting 21 is separated from the spring pin at the tip of the mold pin 3.

The insert fitting 21 is attached to the mold pin 3 by projecting the tip into a space formed between the mold fixing side 6 and the runner plate 5 of the mold which is opened when the product is taken out. Since it is applied to the tip of the mold pin 3, it is possible to take out the product and mount the insert fitting 21 in parallel.

The present invention is not limited to the above embodiment. For example, the mounting mechanism of the insert fitting to the tip of the mold pin may be any suitable one other than the illustrated one.

[0020]

As is apparent from the above, in the insert molding die of the present invention, the molding die is a runner plate, a die fixed side attached to the fixed side of the molding machine, and a movable die attached to the movable side of the molding machine. The insert metal fitting is attached to the die with respect to the tip of the die pin protruding from the lower surface of the runner plate when the die is opened. Therefore, even if the shape of the product is complicated, it is possible to easily insert and mount the insert metal fittings. The time can be shortened. Therefore, the productivity of the insert molding work can be improved, and the cost of the insert molded product can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a mold closed state according to an embodiment of the present invention.

FIG. 2 is a sectional view of the mold in an opened state.

FIG. 3 (a) is a plan view of an insert fitting supply device,
(B) is a partial cutaway side view of the main part.

4A is a cross-sectional view of the insert fitting holding block in a closed state, and FIG. 4B is a cross-sectional view in an open state.

5 (a) and 5 (b) are schematic cross-sectional views sequentially showing the state of insertion of the insert fitting into the mold pin.

FIG. 6 is a view showing a structure in which 2 is attached to the tip of the output shaft of the transfer cylinder.
The perspective view of a forked elastic pin.

FIG. 7 is a perspective view of an elastic pin attached to the tip of the mold pin.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Upper mounting plate 2 ... Guide pin 3 ... Mold pin 4 ... Limit pin 5 ... Runner plate 6 ... Mold fixed side 7 ... Stepped hole 8 ... Lower mounting plate 9 ... Mold movable side 10 ... Support frame 11 ... Runner 12 ... Knockout bar 13 ... Guide bush 14 ... Spring 15 ... Space 21 ... Insert metal fitting

Claims (1)

[Claims] 1. An upper fixing plate mounted on a fixed side of a molding machine, a guide pin erected on a lower surface of the fixing plate, a mold pin having a smaller axial length than this, and the upper fixing in proximity to the guide pin. The guide pin and the mold pin are slidably engaged with the limit pin provided slidably in the plate in a limited range in the axial direction, and the guide pin and the mold pin are fixed to the limit pin. The runner plate is provided with a communicating through hole, the mold fixed side that is slidably engaged with each of the pins and the range of movement is restricted by the limiting pin and the guide pin, and the molder movable side is mounted. It has a lower mounting plate and a movable mold side that is installed on the lower mounting plate and forms a molding space between the upper surface of the lower mounting plate and the lower surface of the fixed mold side. The side gap is opened by lowering the movable mold side, and the mold fixed side A space is formed between the upper surface and the Larner plate, and a mechanism for sequentially supplying the insert fittings to the lower end of the mold pin is provided in a state where the lower end of the mold pin is projected in the space. Insert molding dies.