JP4255327B2 - Injection mold - Google Patents

Description

  The present invention relates to an injection mold using a nested mold, and more particularly to an injection mold in which a plurality of types of molded products are molded by exchanging the insert.

  In general, injection molds are known in which the mold cavity is formed into the shape of a molded product, and in addition, a nested mold is inserted into the cavity to mold a molded product having a complicated shape. It has been. An injection mold using such a nested mold is configured, for example, as shown in FIG.

In FIG. 3, the injection mold 1 includes a fixed mold 3 attached to a fixed mold attachment plate 2 and a movable mold 5 attached to a movable mold attachment plate 4.
As shown in detail in FIG. 4, the product insert 6 is embedded in the surface of the movable mold 5 facing the fixed mold 3, and the insert insert 7 is embedded in the product insert 6. .

The insert mold 7 is fixedly held by a tightening bolt 8 from below the movable mold 5 through a screw hole 5a and a through hole of the product insert 6. By loosening the tightening bolt 8, the moveable mold 7 is fixed. It can be removed from the upper side of the mold 5 and replaced with another nested mold 7.
Here, a plurality of types of nesting molds 7 are prepared in order to form molded products having partially different shapes, and the nesting molds 7 can be selected and replaced as appropriate according to the molded products. ing.

  According to the injection mold 1 having such a configuration, by closing the movable mold 5 with respect to the fixed mold 3, the molten resin material is injected into the cavity defined inside and cooled. After solidification, the mold is removed and a molded product having a cavity shape is formed.

  By the way, when the insert mold 7 is replaced with another insert mold, the movable mold 5 of the injection mold 1 is opened with respect to the fixed mold 3 and the insert mold 7 is replaced. In this case, if the molding interruption time for replacement of the insert mold 7 becomes long, the cylinder temperature of the injection molding machine is lowered and the mold temperature is lowered, so that the yield of the molded product is lowered.

Therefore, it is necessary to make the nesting die 7 easily detachable from the injection mold 1. An injection molding die that employs such a nested die replacement method is disclosed in Patent Document 1, for example.
JP 2000-351136 A

  In the insert mold according to Patent Document 1, the insert mold is positioned in a predetermined recess in the movable mold, and the recess is evacuated from the outside by a vacuum pump to adsorb the insert mold in the recess. Thus, it is fixedly held in the movable mold.

  As a result, the nested mold can be fixedly held at a predetermined position in the movable mold by the vacuum exhaust of the vacuum pump, and the nested mold can be easily removed from the movable mold by interrupting the adsorption by interrupting the vacuum exhaust. It can be removed.

However, Patent Document 1 has the following problems.
That is, in the insert mold of Patent Document 1, an evacuation system is required for fixing and holding the telescopic mold in the nested mold, resulting in an increase in equipment cost.
In addition, because vacuum suction is used for fixing and holding in the nested movable mold, vacuum evacuation is required, and this takes time, so the molding interruption time becomes longer. End up.

  In view of the above, an object of the present invention is to provide an injection mold using a nested mold that can be easily replaced in a short time by a simple operation.

According to the first aspect of the present invention, the object is to provide a nested mold comprising a fixed mold and a movable mold, and defining a part of a molding surface inside the fixed mold or the movable mold. An injection mold provided with a replaceable and nesting mold attaching / detaching device, wherein the nesting mold attaching / detaching device disposed in a through-hole provided in the fixed mold or the movable mold includes A first engaging portion comprising a plug or socket provided in the nesting type inserted through the through hole, and a first engaging portion comprising a socket or plug which is engaged with the first engaging portion and constitutes a coupler . A second engaging portion, and a telescopic release member configured as a sleeve for performing an operation of releasing the engagement between the first engaging portion and the second engaging portion when pushing the telescopic die outward. The nesting mold is pushed outward and the nesting mold release member Comprising an operating member for moving the release direction, wherein the through hole has a smaller inside diameter in the region of the first engagement portion insertion side of the nested, the said nested attachment apparatus The region around the second engaging portion has a relatively large inner diameter, and a step portion is formed at the boundary between these different inner diameters, and the outer end of the nested release member is in contact with the step portion. In this state, the first engagement portion and the second engagement portion are engaged to fix and hold the nested mold in the through hole, and the first engagement portion is operated by operating the operation member. This is achieved by an injection mold that releases the engagement between the second engagement portion and the second engagement portion to push the nesting die outward .

In this first aspect, when the telescopic mold is removed, the telescopic mold is provided with the first engaging portion in the through hole of the fixed mold or the movable mold by operating the operation member. The nesting die provided with the first engaging portion is provided with the second engaging portion by pushing the nesting outward, pushing the nesting die outward and operating the nesting die releasing member. Since the first engaging portion and the second engaging portion are disengaged from each other, the nested type provided with the first engaging portion is disposed outside the through hole. It will be pushed out towards. Thereby, the nested mold protruding from the through hole of the fixed mold or the movable mold can be easily taken out.
Further, when the nested mold is attached, the first engaging portion provided in the nested mold is inserted into the through hole of the fixed mold or the movable mold by inserting the nested mold into the through mold. It engages with the second engaging portion of the telescopic attachment / detachment device provided in the hole, is accurately positioned at the attachment position, and is fixedly held.

Therefore, when installing the nesting mold, simply insert the nesting mold into the through hole of the fixed mold or the movable mold and push it in until the first engagement portion engages with the second engagement portion. When removing the telescopic mold, the operation member is operated to disengage the first engaging part from the second engaging part, so that the telescopic mold is fixed by one-touch operation. Since it is pushed out from the through hole of the mold or the movable mold, the nested mold protruding from the through hole of the fixed mold or the movable mold can be easily grasped and taken out.
Accordingly, the insertion / removal of the nested mold to the fixed mold or the movable mold can be performed easily and in a short time, so that the molding interruption time when the nested mold is replaced is shortened.

  In addition, since the first engaging portion and the second engaging portion are configured by plugs or sockets, it becomes possible to use commercially available parts and reduce costs. By using the plugs and sockets, the nesting die can be easily and detachably attached to the stationary die, the movable die or the product nesting, and securely fixed.

  Further, when the nesting mold is removed, the nesting mold releasing member pushes the nesting mold or its first engagement portion outward by operating the operation member of the nesting mold attaching / detaching device. When the outer end of the release member comes into contact with the stepped portion, the outward movement is restricted. As a result, the nesting mold release member and the nesting mold do not jump out of the through hole.

  In addition, the first engagement portion and the second engagement portion can be easily configured by constituting a coupler, and the nested release member is configured as a sleeve, so that it can be penetrated by operation of the operation member. When the second engaging portion pushes the first engaging portion outward in the hole, the nesting-type opening member is opened around the second engaging portion.

  The injection mold according to the second aspect of the present invention is the injection mold according to the first aspect, wherein the operating member acts on the nested mold release member via a transmission mechanism including a lever. The nesting mold release member is pushed out by operating the operation member arranged on the surface of the fixed mold or the movable mold.

  In the second aspect, when the telescopic mold is removed, the operation member is operated so that the operation member moves the second engaging portion outward through the transmission mechanism including the lever. . As a result, the nesting die provided with the first engaging portion is pushed outward, and the nesting die pops out from the through hole of the fixed die or the movable die by operating the nesting die opening member. The mold can be easily removed.

   An injection mold according to a third aspect of the present invention is the injection mold according to the second aspect, wherein the transmission mechanism includes an elastic mechanism.

  In the third aspect, when the operation by the operation of the operating member is performed by the elastic mechanism, the operation member is pushed with a force of a predetermined level or more when the nested release operation is performed via the transmission mechanism. When the operating member is pushed beyond the elastic mechanism, the nesting die releasing operation is performed, the nesting die is moved to the outside, and is ejected from the through hole of the fixed die or the movable die, so that the nesting die can be easily removed. . As a result, only when the operation member is pushed with a predetermined force or more, the insert mold is pushed out from the fixed mold or the movable mold, so that the operation member is inadvertently operated by touching the operation member. However, the nested mold is not pushed out, and erroneous operation can be prevented.

  As described above, according to the present invention, when the insert mold of the injection mold having the insert mold is replaced, the operation member of the insert mold attaching / detaching device is operated to operate the first mold provided in the insert mold. One engaging part is removed from the second engaging part of the nested mold attaching / detaching device, and the nested mold is removed by being pushed out from the through hole of the fixed mold or movable mold, and the nested mold is fixed to the fixed mold. Alternatively, by inserting into the through hole of the movable mold and pushing until the first engagement portion and the second engagement portion are engaged, the nesting die is fixed, so that the nesting die is fixed. Insertion / removal and fixing to a nested mold can be performed by so-called one-touch.

  As a result, the nesting-type replacement work can be performed easily and in a short time, and the replacement work time is greatly reduced. Accordingly, the interruption time of the injection molding machine is shortened, and the decrease in cylinder temperature and mold temperature is suppressed, so that the yield and quality of the molded products are improved, and as a result, industrial waste can be reduced, which improves the natural environment. It can contribute greatly.

  As described above, according to the present invention, when the insert mold is attached, the insert mold is inserted into the through hole of the fixed mold or the movable mold, and the first engagement portion is the second engagement section. It is easy to perform by simply pushing it in until it is engaged with the mating part, and at the time of removal of the nested type, the operating member is operated to engage the first engaging part and the second engaging part. The nest mold is pushed out of the through hole of the fixed mold or the movable mold by so-called one-touch.

Accordingly, the nesting mold protruding from the through hole of the fixed mold or the movable mold can be grasped and easily removed, so that the nesting mold can be easily attached to and detached from the fixed mold or the movable mold in a short time. Therefore, the molding interruption time at the time of changing the insert mold is shortened.
Thus, according to the present invention, it is possible to provide an injection mold using a nested mold that can be easily replaced in a short time by a simple operation.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 and 2.
The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. As long as there is no description of the effect, it is not restricted to these aspects.

FIG. 1 shows the configuration of an embodiment of an injection mold according to the present invention.
In FIG. 1, the injection mold has basically the same configuration as the conventional injection mold shown in FIG. 3, and is different in configuration only in that a nesting mold attaching / detaching device 20 is provided. It has become.

Here, the injection mold is a fixed mold 11 similar to the fixed mold 3 attached to the fixed mold mounting plate 2 and a movable mold, like the conventional injection mold shown in FIG. The movable mold 12 is the same as the movable mold 5 attached to the mounting plate 4.
In the illustrated case, a nesting die 13 similar to the nesting die 7 is attached to the surface of the movable die 12 facing the fixed die 11.
Here, the movable mold 12 is formed with a through hole 12a extending inward from the inner surface. The through hole 12a includes a nested receiving portion 12b, a small diameter portion 12c, and a large diameter portion 12d. The first step 12e and the second step 12f are formed at these boundaries.

The nesting die 13 is detachably inserted into the through-hole 12a from the inner surface (upper side in the drawing) of the movable die 12, is fixedly held, and can be replaced with another nesting die 13. ing.
The insert mold 13 is provided with a plug 14 having a known configuration as a first engagement portion at the tip (inner end) thereof.
Thereby, when the insert mold 13 is inserted into the through hole 12a, the main body portion of the insert mold 13 is fitted into the insert receiving portion 12b of the through hole 12a, and its lower portion is in contact with the stepped portion 12e. The plug 14 is accommodated in the small diameter portion 12c.

  The telescopic attachment / detachment device 20 includes a socket 21 as a second engaging portion, a sleeve 22 as a telescopic release member, an operation member 23, and a transmission mechanism 24.

The socket 21 is fixedly held with respect to the movable mold 12 so as to be located in the large diameter portion 12d of the through hole 12a of the movable mold 12.
The socket 21 has a publicly known configuration and constitutes a coupler in a pair with the plug 14 described above, and the insert mold 13 is inserted into the through hole 12a and its bottom is in contact with the step 12e. Thus, the insert mold 13 is detachably fixedly held by being engaged with the plug 14.

  The sleeve 22 is slidably supported around the socket 21 in the large-diameter portion 12d of the through hole 12a, and a plug fixing mechanism is provided inside the sleeve 22. When the socket 21 is moved upward in FIG. 2, the sleeve 22 comes into contact with the second step portion 12f at the upper end of the large-diameter portion 12d, and when the socket 21 is moved upward, the sleeve 22 is moved upward. The plug 21 is pushed downward with respect to the socket 21, the plug fixing mechanism inside the sleeve 22 is released, and the engagement of the plug 14 with the socket 21 is released.

  The operation member 23 is supported in the peripheral region of the movable mold 12 so as to be slidable vertically in a second through hole 12g penetrating vertically, and a knob 23a is provided as an upper end portion of the operation member 23. It protrudes from the inner surface of the.

In the illustrated case, the transmission mechanism 24 includes a lever 25 supported by a swingable fulcrum as a so-called lever.
One end 25 a of the lever 25 is swingably connected to the lower end of the operation member 23, and the other end 25 b is swingably connected to the lower end of the socket 21.

The injection mold according to the embodiment of the present invention is configured as described above. First, when the insert mold 13 is attached, the replacement operation is performed as follows.
First, in a state where the movable mold 12 of the injection mold is separated from the fixed mold 11 and opened, the insert mold 13 is inserted into the through hole 12a provided in the movable mold 12, and the bottom portion thereof is inserted. Is pushed in until it comes into contact with the first step 12e of the through hole 12a.

As a result, when the bottom of the nesting die 13 comes into contact with the first step portion 12e, the plug 14 engages with the socket 21 of the nesting die attaching / detaching device 20 provided in the movable die 12 and is fixed. Retained. In this way, the nesting die 13 is attached to the movable die 12.
In this state, when the injection molding machine is operated, injection molding using the insert mold 13 is performed.

When the nesting die 13 is replaced with another nesting die 13, it is already mounted in the through hole 12a. Remove the nested mold 13.
That is, in a state where the movable mold 12 of the injection mold is separated from the fixed mold 11 and opened, the knob 23 a protruding from the inner surface of the movable mold 12 is pushed.
As a result, when the operating member 23 moves downward and the lower end pushes one end 25a of the lever 25 of the transmission mechanism 24 downward, the other end 25b of the lever 25 moves upward.

  Therefore, the socket 21 is pushed upward by the upward movement of the other end 25b of the lever 25, and the plug 14 located in the through hole 12a of the movable mold 12 is moved by the upward movement of the socket 21. While being pushed out of the movable mold 12, the sleeve 22 is pushed downward with respect to the socket 21 to restrict upward movement by the step portion 12f, and the plug 14 is released from the engagement with the socket 21 and opened. The telescoping die provided with the plug 14 stops in a state of protruding from the surface of the movable die 12.

  In this state, since the nesting die 13 can be easily lifted by hand, the nesting die 13 is replaced with a new nesting die 13 and the new nesting die 13 is replaced with the movable die 12 in the same manner as described above. By inserting into the through-hole 12a, the insert mold 13 is fixed and mounted in the through-hole 12a of the movable mold 12.

Thus, according to the injection mold of the embodiment of the present invention, the insert mold 13 can be attached by simply inserting it into the through hole 12a of the movable mold 12 and pushing it in, and the movable mold of the operation member 23. It can be removed simply by pushing in the knob 12a protruding from the inner surface of the mold 12. Accordingly, since the nesting die 13 can be attached / detached by a so-called one-touch operation, no skill is required for exchanging the nesting die 13, and the exchanging operation can be completed in a short time.
Thereby, since the interruption time of the injection molding machine due to the replacement of the insert mold 13 is shortened, a decrease in the cylinder temperature and a decrease in the mold temperature of the injection molding machine are suppressed, and the yield of molded products is improved.

  In the above-described embodiment, the nesting type attaching / detaching device 20 is configured with the lever 25 as the transmission mechanism 24, but is not limited thereto, and may have other configurations.

  Furthermore, in embodiment mentioned above, although the knob 23a as an operation part of the operation member 23 is exposed to the inner surface of the movable metal mold | die 12, it is operating by pushing in, but not only this but the movable metal mold | die 12 is performed. It may be exposed on the back side surface (lower surface) or side surface of the, and may be configured to operate by pulling out the end. In this case, if the socket 21 is moved upward by the operation of the knob 23a to push up the plug 14, a transmission mechanism 24 having an arbitrary configuration can be used.

  In the embodiment described above, the nesting die 13 is mounted in the through hole 12a provided in the movable die 12. However, the present invention is not limited to this, and the product nesting 6 on the movable die 5 is attached. It may be mounted in the through hole provided, or may be mounted in the through hole provided in the fixed mold 3 or the through hole provided in the product insert on the fixed mold. It is clear that it is good.

It is a schematic sectional drawing which shows the principal part of one Embodiment of the injection die by this invention. FIG. 2 is a more detailed partial enlarged cross-sectional view of the vicinity of a nested mold in the injection mold of FIG. 1. It is a schematic sectional drawing which shows the structure of an example of the conventional injection mold. It is a schematic sectional drawing which shows the principal part of the injection mold of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conventional injection mold 2 Fixed mold mounting plate 3 Fixed mold 4 Movable mold mounting plate 5 Movable mold 5a Screw hole 6 Product insert 7 Nest mold 8 Bolt 10 Injection mold 11 Fixed mold 12 Movable mold Die 12a Through hole 12b Nested receiving part 12c Small diameter part 12d Large diameter part 12e First step part 12f Second step part 12g Through hole 13 Nesting type 14 Plug (first engaging part)
20 Nested type attaching / detaching device 21 Socket (second engaging portion)
22 Sleeve (Nested release member)
23 Operation member 23a Knob 24 Transmission mechanism 25 Lever

Claims (3)

An injection mold comprising a fixed mold and a movable mold, and a replaceable insert mold defining a part of the molding surface inside the fixed mold or the moveable mold, and an insert mold attaching / detaching device. The nesting die attaching / detaching device disposed in a through hole provided in the fixed die or the movable die is provided in the nesting die inserted through the through hole. A first engaging portion made of a plug or a socket, a second engaging portion made of a socket or a plug that engages with the first engaging portion to form a coupler, and when the telescopic mold is pushed out A nesting-type release member configured as a sleeve for releasing the engagement between the first engagement portion and the second engagement portion; and pushing the nesting die outward and releasing the nesting-type release member And an operation member that moves in a direction. The through hole, said has a relatively small inner diameter in the nested region of the first engagement portion insertion side, compared to the area around the second engagement portion of the nested attachment apparatus The first engaging portion and the step with the outer end of the telescopic release member in contact with the stepped portion. Engaging the second engagement portion to fix and hold the insert mold in the through hole, and engaging the first engagement portion and the second engagement portion by operating the operation member The mold for injection molding is characterized in that the mold is released and the insert mold is pushed outward . The operation member is configured such that an end portion of the operation member acts on the telescopic release member via a transmission mechanism including a lever, and is disposed on a surface of the fixed mold or the movable mold. 2. The injection mold according to claim 1, wherein the insert mold is pushed out and the insert mold release member is operated by operating the insert mold. The injection mold according to claim 2, wherein the transmission mechanism includes an elastic mechanism.