JPH0133294Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a mold for injection molding of synthetic resin products. This relates to type switching devices.

[Conventional technology]

FIG. 1 illustrates a commonly used structure of an injection mold, in which a runner stripper plate 3 is fixed to a fixed side mounting plate 2 on which a spool pusher 1 is provided. The fixed side template 4 and the movable side template 5 are stacked one after another so that they can be moved,
A receiving plate 6 and a spacer block 7 are attached to the movable side template 5.
The movable side mounting plate 8 is sequentially fixed, an ejector plate 9 is assembled in the spacer block 7, and the product is ejected from the core 11 with an ejector pin 10 attached to the plate 9.

In the above-mentioned injection mold, when molding a product, the mold frame constituent members overlap each other as shown in FIG. Resin is injected from a spool pusher 1.

When taking out the product, the fixed side mold plate 4 and the movable side mold plate 5 are opened, and the runner stripper plate 3 and the fixed side mold plate 4 are also opened, and the resin runner part is removed from the spool pusher 1. must be removed.

Conventionally, an opening/closing device for separating both mold plates 4 and 5 and separating the fixed side mold plate 4 and the runner stripper plate 3 has been used to open and close the side surfaces of the fixed side mold plate 4 and the receiving plate 6. They are connected by a chain of the length necessary for separation, and first, both mold plates 4 and 5 are separated and the chain is tensed, then the fixed side mold plate 4 is pulled and separated from the runner stripper plate 3. I was trying to do that.

[The problem that the idea aims to solve]

However, in the above-mentioned switchgear using a chain, the chain loosens when both templates 4 and 5 are closed, and the loosened chain is caught between the templates, and when the templates are separated, tension is applied to the chain. There is a problem in that the chain is cut due to high pressure.

Further, when the product to be molded has a thin wall thickness, there is less risk of deforming the product by first separating the runner portion and then separating the templates 4 and 5.

However, in the opening/closing device using a chain, since the template 4 and the runner stripper plate 3 are separated after the templates 4 and 5 are separated, the runner part is opened before the templates 4 and 5 are separated. The problem is that you can't let go.

The problem with this invention was to solve the problems mentioned above, and it was possible to separate the runner part before separating the template, and also to make it possible to align the runner part when it was assembled into the mold. The purpose of the present invention is to provide an automatic mold opening/closing device that is highly durable and capable of performing accurate mold opening/closing.

[Means to solve the problem]

In order to solve the above-mentioned problems, this invention provides flanges 22a and 23a on the outer peripheries of the opposing end surfaces of the base member 22 and the lock member 23, which are formed in a circular shaft shape, so that the base member 22 of the lock member 23 A coupling shaft 36 having a diameter smaller than that of the base member 22 is provided protrudingly on an end face opposite to the base member 22, and the base member 22 has an inlet 25 that opens on the face opposite to the locking member 23 so that the coupling shaft 36 can be fitted into the base member 22. Entrance 2
A storage chamber 26 is formed which has a diameter larger than that of the base member 22 and is connected to the inside of the entrance port 25 . A movable member 28 housed so as to be movable in the axial direction, and this movable member 28
between the end face of the storage chamber 26 and the upper wall 31 of the storage chamber 26.
A plurality of groups of trochanters 27 are arranged to be movable in the radial direction of the upper wall 6, and a spring 30 is incorporated in the movable member 28 to provide elasticity that constantly presses the groups of trochanters 27 toward the upper wall 31. A protrusion 32 is provided on one of the mutually opposing surfaces of the wall 31 and the movable member 28 to limit and hold the minimum arrangement inner diameter of the trochanter 27 group to a smaller diameter than the outer diameter of the coupling shaft 36. Trochanter 27
Inclined surface 3 for pressing the group toward the protrusion 32
4, and a concave groove 37 is provided on the outer circumferential surface of a connecting shaft 36 protruding from the locking member 23 so that it can be freely engaged with and removed from the group of trochanters 27.

[Effect]

A locking member having a base member and a coupling shaft is fixed to each of the opposing mold constituent members, and a plurality of trochanter groups and this trochanter group are movable in the radial direction of the storage chamber in the storage chamber of the base member. Incorporating a movable member that holds the trochanter so that
Since the coupling shaft of the locking member is provided with the engagement recess for the trochanter group, when the base member is fitted to the coupling shaft, the coupling force between the engagement recess and the trochanter group will cause the combined mold configuration during the mold separation process. Detachment of the members may be delayed.

〔Example〕

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

FIG. 1 shows an example in which the opening/closing device 21 of this invention is attached with bolts to the inside of a fixed mold plate 4 and a movable mold plate 5 of an injection mold.

As shown in FIGS. 2 and 3, the opening/closing device 21 is
It is constituted by a combination of a base member 22 fixed to the movable side template 5 and a lock member 23 fixed to the fixed side template 4 in a coaxial arrangement with the base member 22, and both members 22 and 23 are equal. It is formed in the shape of a circular axis with a diameter, and two guards are attached to the outer periphery of the vertically opposing surfaces.
2a and 23a are provided, and a coupling shaft 36 having a smaller diameter than the base member 22 is protruded from the surface of the lock member 23 facing the base member 22.

The base member 22 has an inlet 25 that opens on the surface facing the lock member 23 so that the coupling shaft 36 of the lock member 23 can fit into the circular case 24, and an inlet 25 that is located inside the inlet 25 than the inlet 25. A movable member 28 that is provided in series with a large-diameter storage chamber 26, is formed in a cylindrical shape having an inner diameter into which a coupling shaft 36 fits, and is movable in the axial direction of the storage chamber 26; The upper end surface of this movable member 28 and the storage chamber 2
A plurality of trochanters 27 are arranged between the upper wall 31 at 6 and the trochanters 27 so as to be movable in the radial direction of the storage chamber 26.
group, the movable member 28, and the bottom plate 29 of the storage chamber 26.
A spring 30 is installed between the movable member 28 and the spring 30, which imparts elasticity to the movable member 28 to press the trochanter 27 group against the upper wall 31.

A protrusion 32 is formed in an annular shape on the inner surface of the upper wall 31 in a portion surrounding the opening of the entrance port 25 to limit and hold the minimum arrangement inner diameter of the trochanter 27 group to a diameter slightly smaller than the outer diameter of the coupling shaft 36. has been done.

Furthermore, on the upper end surface of the movable member 28, there is an arcuate recessed surface 33 in which the trochanter 27 group is accommodated, and an inclined surface 34 that extends outward from the upper part and continues from the outer periphery of this arcuate recessed surface 33.
is formed.

When the movable member 28, which is given upward elasticity by the spring 30, presses the trochanter 27 group against the upper wall 31, the inclined surface 34 presses the trochanter 27 group and clamps the trochanter 27 between the protrusions 32 and the trochanter 27 group. It serves to maintain the child 27 group at the minimum inner diameter.

Therefore, the elasticity of the spring 30 acts on the trochanter 27 group via the movable member 28 and the inclined surface 34, and the elasticity to return to the state of the minimum arrangement inner diameter is imparted to the group of trochanters 27, and the movable chamber 26 and the movable When the coupling shaft 36 is inserted toward the internal through hole 38 of the member 28, the trochanter 2
The seventh group is pushed outward in the radial direction of the storage chamber 26 by the coupling shaft 36.

When the trochanter 27 group is pushed apart, the trochanter 27 group presses against the inclined surface 34, so the movable member 28 compresses the spring 30 and escapes downward due to the action of the trochanter 27 group. This will allow for expansion.

The outer circumferential surface of the coupling shaft 36 has a trochanter 27 group at a position facing the trochanter 27 group when the coupling shaft 36 is inserted a predetermined length into the storage chamber 26 and the through hole 38 from the entry port 25. A recessed groove 37 is provided in which the lock member 27 is removably engaged, and the engagement between the recessed groove 37 and the group of trochanters 27 connects the base member 22 and the lock member 23 in the axial direction. base member 2 with a force that overcomes the above bonding force determined by
2 and the locking member 23, the coupling shaft 36 can be pulled out from the base member 22.

In addition, the spring 30 that presses the movable member 28 can be adjusted by adjusting the screwing amount of the screwed bottom plate 29, so that the elasticity of the spring 30, that is, the elasticity of the spring 30, that is, the trochanter 27
It is now possible to adjust the bonding strength of

As shown in FIG. 2, the base member 22 and the locking member 23 are assembled into the mold with the mold plates 4 and 5 placed one on top of the other in position. Through-holes 41 and 42 are bored simultaneously.

This simultaneous drilling allows the through holes 41 and 42 to be aligned accurately.

Recessed step portions 43, 44 into which the flanges 22a, 23a fit into the ends of the overlapping surfaces of both the through holes 41, 42
are formed respectively, and concave stepped portions 45 and 46 are also formed at opposing ends.

The base member 22 has a screw hole 4 in the center of the bottom plate 29.
7 is provided, and a bolt 49 passing through the end plate 48 fitted into the recessed step portion 45 is screwed into the screw hole 47, and by pulling this bolt 49, it is fixed to the movable side template 5. ing.

Further, the locking member 23 has a screw hole 50 provided in the circular shaft-shaped attachment portion 35 to the stationary template 4, and a through bolt 52 of the end plate 51 fitted in the recessed step portion 46 is screwed into the screw hole 50. It is fixed to the template 4 by pulling the bolt 52, and the connecting shaft 3
6 is screwed into the screw hole 50, and the base member 22
The amount of protrusion to the side can be adjusted freely.

Next, FIG. 4 shows a locking member 23 for the mold.
Another example is shown in which a through hole 63 for a bolt 62 is provided in a plate 61 overlapping the fixed side template 4, and this bolt 62 is screwed into a screw hole 50 of a locking member 23. The end of the through hole 42 on the plate 61 side is straight.

The opening/closing device of this invention has the above-mentioned configuration, in which the through holes 41 and 42 are bored at once with both templates 4 and 5 superimposed in the state at the time of molding, and then the templates 4 and 5 are are separated, recessed steps 43, 44 and 45, 46 are formed at both ends of both through holes 41, 42, and base member 22 and locking member 23 are inserted into end plates 48, 51 in both through holes 41, 42. It is fixed using bolts 49 and 52.

Note that the flanges 22a and 23a provided on each of the base member 22 and the lock member 23 may be attached by a screw structure, and when the two members 22 and 23 are attached to the templates 4 and 5, the flanges 22a and 23a are attached to the base member 22 and the lock member 23, respectively. Part 43, 4
Even if there is an error in the counterbore depth in step 4, the error in depth can be absorbed by adjusting the mounting position.

As shown in FIGS. 1 and 2, when the mold is assembled, the coupling shaft 36 fits into the base member 22, and the trochanter 27 group and the engaging groove 37 engage with each other, causing both the mold plates 4 and 5. is locked.

Next, when the movable mounting plate 8 is pulled down to take out the product, the mold plates 4 and 5 are moved to the opening/closing device 2.
1, the runner stripper plate 3 and fixed side mold plate 4, which are fixed to the fixed part through the fixed side mounting plate 2, are first separated, and the runner part is inside the spool pusher 1. removed from.

At this time, the opening/closing device 21 has a pulling force required to separate the runner stripper plate 3 and the stationary template plate 4 due to the engagement of the trochanter 27 group set by the spring 30 and the engagement groove 37. Since the elasticity of the spring 30 is adjusted in advance so as to be greater than the force, both mold plates 4 and 5 move together while remaining in the overlapping state with the opening/closing device 21 locked.

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 blur bolt 12 connected to the stationary mounting plate 2 and stops. Therefore, when the separation continues, the movable template 5 is pulled against the stationary template 4 that has stopped.

The force for separating the movable mold plate 5 from the stationary mold plate 4 that has stopped is set to be larger than the pull-out force set by the spring 30 of the opening/closing device 21.

For this reason, the trochanter 27 group of the opening/closing device 21 and the groove 3
A pulling force larger than the engagement force set by the spring 30 is applied to the engagement portion of 7, and the group of trochanters 27 are disengaged from the groove 37, and the lock is released, and the base member 22 is removed from the coupling shaft 36. The movable mold plate 5 is separated from the fixed mold plate 4.

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

In addition, to assemble the mold, it is sufficient to move the movable side mounting plate 8 closer to the fixed side mounting plate 2, and the coupling shaft 3
The base member 22 is externally fitted onto the mold plate 6, the group of trochanters 27 is engaged with the groove 37, and the mold plates 4 and 5 are locked again by the opening/closing device 21 in an overlapping state.

The mold in which the opening/closing device 21 is installed can be used not only for the pin gate and pin protrusion methods as shown in the figure, but also for the stripper plate ejection method, etc., and the position where the opening/closing device 21 is installed is such that the opening/closing operation is delayed when taking out the product. For example, it may be installed between a movable mold plate and a receiving plate in a stripper plate ejecting mold to pull the stripper plate toward the fixed side.

〔effect〕

As described above, this invention has the above-described configuration, and therefore has the following effects.

() A base member and a lock member having a coupling shaft that can be freely inserted into and removed from the base member are attached to opposing mold constituent members, and a plurality of trochanter groups, moving members, and springs are incorporated into the base member. Since the locking member's connecting shaft is provided with a groove for engaging the trochanter group, the delay effect in the opening of the mold is reduced.
This is achieved by engaging and detaching the trochanter group and the locking member, and eliminates the inconvenience caused when using a chain.

() Multiple trochanter groups are arranged around the periphery, and the concave groove of the locking member is connected to and removed from the group, so
Resistance during hanging and unloading acts evenly around the periphery, allowing both templates to open and close in parallel.

() Since it can be installed inside the mold to create a delay in opening and closing, the mold can be dismantled without any hindrance, and no adjustment work is required after disassembling and assembling the mold.

() Since it can be installed inside the mold, the extra space inside the mold can be used effectively, there is no protruding part to the outside of the mold, and the mold can be made smaller.

() Since the base member and lock member are formed in the shape of a circular shaft, a through hole for mounting can be drilled in the template to be mounted while they are overlapped, making it possible to align the two members. Can be done accurately.

() The recessed grooves provided in the connecting shaft between the multiple trochanter groups and the locking member delay the opening and closing of the template, so there is no risk of wear and tear even if the template is inserted and removed many times. It has improved durability and can be used repeatedly over a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing the operating state of the switchgear according to this invention, Fig. 2 is a partially cutaway front view enlarging the main parts of the same, Fig. 3 is an exploded perspective view of the switchgear, and Fig. 4 is an exploded perspective view of the switchgear. FIG. 7 is a front view with a cutaway of main parts showing the second embodiment. 21...Switching device, 22...Base member, 23
... Lock member, 25 ... Entrance port, 26 ... Storage chamber, 27 ... Trochanter, 28 ... Movable member, 30 ...
Spring, 36... Connection shaft, 37... Engagement groove.

Claims (1)

[Scope of utility model registration request] Flanges 22a and 2 are provided on the outer periphery of the opposing end surfaces of the base member 22 and the lock member 23, which are formed into a circular shaft shape.
3a are provided respectively, and the base member 2 of the lock member 23 is
A coupling shaft 36 having a diameter smaller than that of the base member 22 is provided protrudingly on the end face facing the base member 22, and the base member 22 has a
An entry port 25 that opens on the surface facing the locking member 23 so that the coupling shaft 36 can be fitted therein, and a storage chamber 26 that has a larger diameter than this entry port 25 and is connected to the inside of the entry port 25 are formed. Inside the storage chamber 26, there is a movable member 28 which is formed into a cylindrical shape with an inner diameter into which the coupling shaft 36 fits and is housed so as to be movable in the axial direction of the base member 22, and an end face of the movable member 28 and the storage chamber. A plurality of groups of trochanters 27 are arranged between the upper wall 31 of the storage chamber 26 and the upper wall 31 of the trochanter 26, and a plurality of groups of trochanters 27 are arranged between the movable member 28 and the upper wall 31 of the trochanter 26 so as to be movable in the radial direction of the storage chamber 26.
A spring 30 that provides elasticity to constantly press the trochanter 27 is installed on one of the opposing surfaces of the upper wall 31 and the movable member 28 so that the minimum inner diameter of the trochanter 27 group is smaller than the outer diameter of the coupling shaft 36. A protrusion 32 is provided to limit and hold the trochanter 27 to a small diameter, and an inclined surface 34 is formed on the other surface of the above for pressing the group of trochanters 27 toward the protrusion 32. Axis 3
6 is an automatic mold opening/closing device provided with a groove 37 on the outer circumferential surface of the trochanter 27 that can be freely hooked onto and removed from the trochanter 27 group.