JPS5941219A - Apparatus for automatic opening and closing mold - Google Patents

Abstract

PURPOSE:To obtain an opening and closing apparatus that allows a runner section to be separated before retainer plates are separated away and is excellent in durability, by providing a fitting part of a connecting member with an annular groove, and arranging a group of balls that can be resiliently moved to be engaged with or disengaged from said groove. CONSTITUTION:When the stationary side retainer plate 4 is separated away from a runner stripper plate 3 by a prescribed stroke, the stationary side retainer plate 4 abuts on plow bolts 12 connected to a stationary side die plate 1 to be stopped. If further the separation is continued, the movable side retainer 5 with the stationary side retainer plate 4 stopped is pulled, the locking of the groove 27 to the group of the balls 37 in each of opening and closing apparatuses 21 is released against the force of a spring 36, the connecting member 23 is disengaged from a connecting shaft 26, and the movable side retainer plate 5 is separated away from the stationary side plate 4. Then an ejector plate 9 is moved so that a product is ejected from a core 11 by an ejector pin 10. When the molds are to be assembled, it is only required that both die plates 2, 8 approach, so that the retainer plates 4, 5 are put together and locked again by the opening and closing apparatuses 21.

Description

[Detailed Description of the Invention] This invention provides injection molding for synthetic resin products.
This invention relates to a switching device that automatically connects and disconnects parallel-type components.

t)'S Figure 1 illustrates a 4Niiffl which is preferably used in an injection mold, and the identification side installation where the spool bushing 1 is provided fixes the runner stripper plate 3 to the plate 2. Then, attach the fixed side template 4 to this plate 3.
Stack the movable side mold plate 5 one after another so that they can be moved, and attach the support plate 6, spacer block 7, and movable side mounting plate 8 to the movable side mold plate 5 in a chin-like manner, An ejector plate 9 is incorporated, and a product is ejected from a core 11 using an ejector bin 10 attached to the plate 9.

In the above-mentioned injection mold, when the product 1 & shape is used, each mold frame constituent member overlaps and measures each other as shown in Fig. Resin is injected from the spool bushing 1 into the formed molding space.

When taking out the product, the fixed side formwork 4 and the movable side formwork 5 are opened (also, the runner stripper plate 3 and the fixed side formwork 4 are also opened, and a portion of the resin runner is removed from the spool bush 1). You must do the same thing in January.

Conventionally, the opening/closing device which allows the opening and closing of both mold plates 3.4 and the fixed side mold plate 4 and the runner stripper plate 3 to be separated has been used. The outside is connected with a chain of the length necessary for separation, and when the 111Ii templates 3 and 4 are separated and the chain is tensed, the fixed side template 4 is then pulled and the thin stripper plate is pulled. I was trying to separate from 3.

By the way, in the above-mentioned opening/closing device using a chino, the chino loosens when both templates 3.4 are closed, and the loosened chino is caught between the templates, and when the templates are separated, tension is applied to the chino. There is a problem that it can become loose and cause cuts in the cheno.

Furthermore, when the product to be molded has a thin wall thickness, there is less risk of imparting a diamond shape to the product by first separating a portion of the runner and then opening the mold &3.4.

However, in the opening/closing device using a chino, the template 4 and the runner stripper plate 3 are separated after the template 3.4 is separated. There is a problem in that a portion of the runner cannot be opened prior to the YU of 4.

This invention was made to solve the above-mentioned problems, and the purpose is to provide a highly durable opening/closing device in which a portion of the runner can be removed before the template is removed. It is.

The configuration of this invention is such that the current concave groove is formed in one of the two coupling members that are recently fitted in each member of the opposing mold component members,
On the other hand, a hole group is provided which is given elasticity to move in the direction of engaging and disengaging from this concave groove, and due to the bonding force between the four walls and the ball group, the opening of the joint drum-shaped component during the separation process is slowed down. It was designed so that

The present invention will be described below with reference to embodiments shown in the accompanying drawings.

FIG. 1 shows an example in which the opening/closing device 21 of the present invention is installed across a fixed mold plate 4 and a movable mold plate 5 of an injection mold.

As shown in FIG. 2, the opening/closing device 21 is formed by a combination of a connecting portion 22 fixed to one template and a cylindrical connecting member 23 fixed to the other template.

One of the coupling members 22 is composed of a fixed shaft body 25 having a female thread 24 on its inner circumferential surface, and a retractable shaft 26 that can be screwed onto this shaft body 25 by one inch. An outer circumferential surface protruding from the shaft body 25 is provided with an annular groove 27 and a tapered surface 28 having a sharp tip.

The fixed shaft body 25 has been shown as an example in which it is removably fixed to the template 4 with a lock bolt 30 using a groove 29 provided on the outer periphery. Alternatively, the connecting shaft 26 may be formed by cutting out of the same material as the shaft body 25, but if the attachment/detachment structure shown in the figure is adopted, it can be replaced with one of various lengths.

The other coupling member 23 includes a ring 34 built into a cylindrical body 33 having an opening 32 in an end wall 31 for holding the coupling shaft 26 so as to be movable in the axial direction, and this ring 34.
A spring 36 is compressed between a set screw 35 screwed onto the end of the cylindrical body 33, and a ring 34, so as to always give elasticity to move toward the end wall 31 side. =[It is composed of a plurality of groups of balls 37 interposed between walls 31.

As shown in FIG. 3, the ball pressing surface of the ring 34 is formed into an arcuate surface 38 where the ball 37 narrows toward the inner periphery, and a tapered surface 39 which slopes from this recessed surface 38 toward the outer periphery. The inner peripheral portion of the ball receiving surface of the end wall 31 is
It is formed in an arcuate protrusion 40 along which .

The ball 37 group is connected to the cylindrical body 3 by the wall 31 and the ring 34.
(3) is constantly clamped so as to be freely movable in the radial direction of the ring (3), and is gathered toward the center of the cylindrical body 33 by a tapered surface 39, with a portion thereof protruding toward the opening 32 and the inner circumferential surface of the ring 34.

Therefore, the coupling shaft 26 is fitted into the cylindrical body 33,
The group of balls 37 is pushed outward by the tapered surface 28, and the ring 34 is moved by the tapered surface 39, and the first concave groove 27 is pushed outward by the ball 37.
At the position facing the group, the ball 37 moves inward and enters the concave groove 27.
This locks the connection between the two coupling members 22 and 23.

Further, both coupling members 22 and 23 can be pulled out by pulling them against the force of the spring 36.

The opening/closing device of the present invention has the above-mentioned configuration, and the ml1
When the mold is assembled as shown in the figure, the coupling shaft 26 is fitted into the cylindrical body 33, and the mold plates 4.5 are locked by the engagement of the groove 27 and the ball 37.

Next, in order to take out the product, both installations are done on plates 2 and 3.
When the templates 4 and 5 are locked by the opening/closing device 21, the runner stripper plate 3 and the stationary template plate 4 are first separated, and a portion of the runner is removed from inside the sprue bush 1. .

When the stationary template 4 is separated from the runner stripper plate 3 by a predetermined stroke, the stationary template 4 comes into contact with the head of the puller bolt 12 connected to the stationary mounting plate 1 and stops. Therefore, if the separation continues, the movable side template 5 will be pulled against the stationary side template 4 which has stopped, and the opening/closing device 21
The concave groove 27 and the group of balls 37 are unlocked against the force of the spring 36, the coupling member 23 is removed from the coupling shaft 26, and the movable template 5 is separated from the stationary template 4.

After this, the ejector plate 9 is moved and the product is ejected from the core 11 using the ejector pin 10.

Further, in assembling the molds, it is sufficient to bring the plates 2 and 8 close to each other, and the mold plates 4 and 5 are locked again by the opening/closing device 21 in an overlapping state.

Note that the opening/closing device 21 is not limited to the structure shown in the drawings, but may include, for example, an annular groove provided on the inner periphery of the joint body.
The shaft body that fits into this cylinder has an inner and outer double structure, and one group of balls 37 can be freely moved in and out of the outer circumferential surface by using the arcuate recessed surface 38, the tapered surface 39, the arcuate protrusion 40, and the spring 36. The cylindrical body and the shaft body may be connected to each other by a recess and a ball so as to be freely removable and removable.

The mold in which the opening/closing device 21 is installed can be used not only for the pino gate and bottle opening methods as shown in the figure, but also for the stripper plate projection method, etc., and the installation position is as follows.
A part where the opening operation is to be delayed when taking out the product, for example, a movable mold plate and a receiver in a mold of a stripper plate ejection type may be incorporated between the plates and the stripper plate may be pulled toward the fixed side.

As described above, according to the present invention, it is formed by two mating parts fixed to opposing mold constituent members, and one coupling member has an annular groove and the other coupling member has a groove and a groove. Since the ball group is provided with elasticity to move in the direction of release, a device for delaying the opening of the mold can be incorporated inside the mold, making it possible to downsize the mold. At the same time, the inconvenience that occurs with conventional opening/closing devices, such as the cinch becoming stuck, is eliminated.

In addition, when used to open the fixed side mold plate and the moving side mold plate of a mold, the runner stripper plate and the fixed side mold plate can be separated before separating both formworks, and the sprue butts can be separated. This makes it possible to reliably remove a portion of the runner from the housing.

Furthermore, since the locking of both coupling members is done together using an annular groove and a group of elastic balls, there is no possibility of friction occurring even if the insertion and removal operations are performed many times. This allows for long-term use.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing the operating state of the opening/closing device according to the present invention, FIG. 2 is an enlarged cross-sectional view of the essential parts of the same, and FIG. 3 is an enlarged cross-sectional view of the same essential parts in an open state. 21...Switching device, 22.23...Connecting member, 26
...Connection shaft, 27...Concave groove, 28.39...Taber surface, 33...Cylindrical body, 34...Ring, 36...
・Spring, 37... Ball, 38... Arc-shaped recessed surface, 4
0...Arc-shaped protrusion special plan consultant Katsutoshi Nishimura Agent Kama 1) Bun 2

Claims (1)

[Claims] It is formed by two connecting members that are each fixed to opposing mold constituent members and fit together so that they can be freely inserted and removed when the placing mold constituent members approach. An automatic mold opening/closing device provided with a concave groove and a ball group on the other side, which is given elasticity to move in the direction of engaging and disengaging from the concave groove.