KR101378703B1 - Under cut injecting apparatus of the injection moulding - Google Patents

Abstract

The present invention relates to an undercut processing apparatus for an injection mold, and more particularly, to simplify the configuration of the product having an undercut structure by integrally forming an elastic member and a return pin driven by vertical movement of the movable mold during injection molding. The present invention relates to an undercut processing apparatus for an injection mold, which can reduce manufacturing labor and material costs.

Description

Under cut injecting apparatus of the injection moulding}

The present invention relates to an undercut processing apparatus of an injection mold, and more particularly, to simplify the configuration of the product having an undercut structure by integrally forming an elastic member and a return pin driven by vertical movement of the movable mold during injection molding. The present invention relates to an undercut processing apparatus for an injection mold, which can reduce manufacturing labor and material costs.

In general, the undercut refers to a concave portion that is difficult to discharge the molded article only by the movement of the mold closing or mold opening direction of the molding machine. An example of an injection molding die for injection molding a product having such an under cut structure is shown in FIG. 1.

As shown, the conventional injection molding mold is a fixed mold 10 having a core 12a having a predetermined shape and the molded product is manufactured by being combined or separated to move up and down with respect to the fixed mold 10. A movable mold 20 in which the cavities 12a and 23a are provided is provided.

The stationary mold 10 includes an upper fixing plate 11, a spacer block 13 fixed to the upper fixing plate 11, and an upper plate 12 fixed to and supported by the spacer block 13. The upper fixing plate 11 is fixed to the upper fixing plate 11, and the return pin 15 and the inclined core 16 are provided on the upper pressing plate 14. An elastic member 17 is provided between the upper fixing plate 11 and the upper sealing plate 14 to push the upper sealing plate 14 against the upper fixing plate 11. The upper plate 12 is formed with a core 12a having a predetermined shape for forming the molded article 30.

Here, the inclined core 16 is formed to form an undercut, and is inclined by a predetermined angle so that the movable mold 20 is rotated as it is opened so as to be separated from the undercut portion 31 of the molded product 30.

The movable mold 20 includes a fixed plate 21, a lower spacer block 22 fixed to an upper side of the fixed plate 21, and a lower plate 23 fixed to an upper side of the lower spacer block 22.

The lower tight plate 24 is fixed to the upper side of the fixed plate 21, and the lower plate 23 cooperates with the core 12a of the upper plate 12 and the inclined core 16 for undercut molding. The cavity 23a for forming 30 is formed.

Looking at the operation of the conventional injection molding mold as described above is as follows. Resin is injected between the cavity 12a, 23a formed by the combination of the upper plate 12 and the lower plate 23 through the resin inlet not shown in the mold closed state, and the molded article 30 of a desired predetermined shape is formed. .

Thereafter, when the molded product 30 is cured after a predetermined time, the upper and lower plates 12 and 23 are opened to release the molded product 30, and the lower plate 23 is attached to the upper plate 12. As it descends, the elastic force of the compressed elastic member 17 installed between the upper fixing plate 11 and the upper side sealing plate 14 is received. As a result, the end portions of the inclined cores 16 fixed to the upper side plates 14 and inclined to the upper plate 12 are separated from the undercut cavities 12a and 23a of the molded product 30.

When the lower plate 23 is completely lowered, the molded article 30 in the cavity 23a of the lower plate 23 is completely separated from the core 12a of the upper plate 12 and installed on the lower tight plate 24. Milpin (not shown) pushes the molded product 30 upward to extract the molded product 30 from the cavity 23a of the lower plate 23.

Wherein the elastic member 17 and the return pin 15 is fixed by the upper contact plate, respectively, the configuration of the conventional elastic member and the return pin is shown in FIG.

Referring to FIG. 2, the conventional elastic member 17 and the return pin 15 are separated from and fixed to the upper and lower surfaces of the upper contact plate 14, respectively. That is, the elastic member 17 is fixed to the groove inwardly from the lower surface of the upper plate 15, the upper pinned plate (11) as the upper side plate 14 is moved by the transfer of the return pin 15 The upper contact plate 14 is pressed against itself by elasticity.

Such conventional elastic members and return pins are separated from each other and fixed to the upper fixing plate and the upper sealing plate through separate assembly processes, respectively. Therefore, the conventional return device is assembled by the return pin and the elastic member by a separate process, respectively, there is a problem in that the productivity and manufacturing cost is reduced due to increased assembly labor and work time.

The present invention has been made to solve the conventional problems as described above, the object of the present invention is to improve the productivity by reducing the assembly labor for fixing to the upper side by integrally configuring the return pin and the elastic member, reducing the manufacturing cost An undercut injection molding apparatus having an integrated return pin can be provided.

The present invention includes the following embodiments in order to achieve the above object.

In a first embodiment of the present invention, an inject mold undercut processing apparatus for extracting an undercut product formed in a cavity having an inclined core and a return pin fixed to an upper mill plate which is lowered to a movable mold side by an elastic force of an elastic member ,
The return pin is an integral return pin formed integrally with an elastic member for applying an elastic force to the upper contact plate,
The integrated return pin is penetrated and fixed from one surface of the upper contact plate to the opposite surface to fit the elastic member,
The integrated return pin extends toward the movable mold side, and includes a pin part inserted into one side of the upper contact plate and fixed at an end thereof.
The pin portion includes a return body extending toward the movable mold side; A latching piece extending laterally from an outer surface of the return body to be in close contact with one surface of the upper contact plate; And a buried end extending in the vertical direction from the engaging piece to be inserted into the upper side of the upper contact plate and extending from the end face to form an insertion hole having an inner surface.

In the second embodiment of the present invention, the integrated return pin is coupled to the lower side of the pin portion on the opposite side of the upper contact plate, the elastic member is fitted to the outer surface, the buried end is open end The inner surface is characterized in that formed in the outer surface to match the tip of the connecting portion.

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In the fifth embodiment of the present invention, the connecting portion extends in one direction so as to be inserted into the end surface of the buried end which is formed at the end of the other side of the upper contact plate; And a connection body extending downward from the fastening end to which the elastic member is fitted at an outer surface thereof.

In the sixth embodiment of the present invention, the buried end is preferably provided with a return pin, characterized in that the thread is formed on the inner surface of the insertion hole.

In the seventh embodiment of the present invention, the connecting portion is inserted through the opening formed in the upper end surface of the connecting body from the opening end to the end of the fastening end; And a screw inserted into the insertion hole and screwed to an inner surface of the buried end.

According to the present invention, since the return pin and the elastic member can be integrated and fixed simply by penetrating the upper sealing plate, the present invention can reduce the number of assembly operations and shorten the working time, thereby improving productivity and reducing manufacturing costs. There is.

1 is a cross-sectional view showing a conventional injection mold,
Figure 2 is a perspective view showing the return pin and the elastic member fixed to the eject pin in the conventional injection mold apparatus,
3 is a perspective view showing an undercut processing apparatus for an injection mold according to the present invention;
Figure 4 is an exploded perspective view of the return pin in the injection mold undercut processing apparatus according to the present invention,
5 and 6 are cross-sectional views showing a driving state of the undercut processing apparatus of the injection mold according to the present invention.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the injection mold undercut processing apparatus according to the present invention will be described in detail.

Figure 3 is a perspective view showing an undercut processing apparatus of the injection mold according to the present invention, Figure 4 is an exploded perspective view of the return pin in the undercut processing apparatus of the injection mold according to the present invention. Here, the same components as those in the prior art (each of the fixed mold and the movable mold) will be described using the configuration and reference numerals shown in FIG.

3 and 4, in the integrated return pin according to the present invention, the elastic member and the return pin 100 are integrally formed and fixed to the upper contact plate 200. In more detail, the integrated return pin 100 is moved to the lower plate side of the movable mold to move the upper plate 200 and the upper portion of the upper plate 200, and the upper plate 200 compared to the upper plate (11) It includes an elastic member 120 for driving, and a connecting portion 130 for connecting the pin portion 110 and the elastic member 120.

The pin part 110 is formed as a rod-like upright to the return body 111 to move the lower plate through the upper plate, and to lock the return body 111 to be fixed to one surface of the upper contact plate 200. The engaging piece 112 and the buried end 113 is buried in the inner side of the upper contact plate 200 and communicated to the lower side.

The return body 111 is manufactured in the shape of an upright rod, and the movable mold 20 and the fixed mold 10 are joined together, so that the upper contact plate 200 is driven by the elastic member 120, the lower end at the end. It is conveyed to be in close contact with the disc 23.

The locking piece 112 is formed to protrude in the horizontal direction from the lower side of the return body 111 to be horizontally extended to be in close contact with the upper surface of the upper contact plate (200). The locking piece 112 is preferably formed to have a thickness to extend horizontally to withstand the load applied when the end of the return body 111 supports the lower plate 23. Since the return body 111 supports the lower plate 23 at the time of driving the upper tight plate 200, a load is applied in proportion to the load of the fixed mold 10. Therefore, the locking piece 112 is preferably set to a thickness to have a strength enough to prepare for the risk of damage to the load applied to the return body 111.

The buried end 113 is extended to the lower side of the engaging piece 112 is embedded in the upper side of the sealing plate 200 is fastened to the connecting portion 130. To this end, the buried end 113 is open so that the lower end is open so that the end of the connecting portion 130 can be inserted, the inner end forms an empty space.

More preferably, the end of the connecting portion 130 forms a screw thread, and the thread corresponding to the thread formed on the end of the connecting portion 130 is formed inside the buried end 113 to further facilitate the assembly. To raise.

The connecting portion 130 is a fastening end 131 extending in one direction to be inserted and fastened to the end of the buried end 113, and the elastic member 120 is fastened to the outer surface on the upper side of the fastening end 131 It includes a connecting body 132 is.

The fastening end 131 has a shape coinciding with the inner opening of the buried end 113 formed to protrude upward from the lower end of the connecting body 132. As described above, the fastening end 131 has a shape corresponding to the coupling structure formed on the inner side of the lower end of the screw thread or the buried end 113 is inserted into the end of the buried end 113. Wherein the fastening end 131 is located on the upper surface of the upper contact plate 200, the buried end 113 is buried in the inner side of the upper contact plate 200 so that the end portion of the upper part of the upper contact plate 200 It is desirable to be exposed.

The connecting body 132 is formed to have a larger diameter on the upper side of the fastening end 131 and to have an empty space on the inner side so that the elastic member 120 is fixed by elasticity on the outer surface. Preferably, the height of the connection body 132 is formed to have a height equal to or lower than that of the elastic member 120.

In addition, the connection body 132 preferably forms an insertion hole 132a communicating from the opening formed at the opposite end surface of the fastening end 131 to the end of the fastening end 131.

That is, the connection body 132 may be firmly coupled to the connecting portion 130 and the pin 110 after the screw is inserted after the fastening end 131 is inserted into the end of the buried end 113. . In more detail, the screw (not shown) is inserted into the insertion hole 132a of the connecting body 132 and formed on the inner surface of the buried end 113 through the fastening end 131. It is fastened with the screw thread that can be more firmly coupled to the connecting portion 130 and the pin portion (110).

In this case, the outer surface of the fastening end 131 is formed in a fitting manner that is fixed by friction with the outer surface of the buried end 113 rather than a screw thread is formed. Alternatively, as described above, a screw thread may be formed on an inner surface of the buried end 113 and a screw thread may be formed on an outer surface of the fastening end 131. It is also possible to form a mechanical configuration that is consistent with each other, such as a locking projection (not shown in the drawing) formed on the engaging groove on the outer surface of the fastening end 131).

The elastic member 120 has an elastic force and is fixed to the outer surface of the connecting body 132 so that the return pin 110 is lifted while the upper contact plate 200 is moved to the upper fixing plate 11 side is compressed and then elastically The upper contact plate 200 is reversed by the repulsive force.

Here, preferably, a mounting groove (not shown) is formed on the lower surface of the upper fixing plate 11 to allow the elastic member 120 to be seated upon contact with the elastic member 120. This is as shown in FIGS. 5 and 6.

The present invention includes the above-described configuration. Hereinafter, the operation achieved through the above-described configuration will be described in detail.

5 and 6 are cross-sectional views showing a driving state of the undercut processing apparatus of the injection mold according to the present invention, Figure 5 is a view showing the state before the upper plate is driven, Figure 6 is a state in which the upper plate is driving. Figure is shown.

An assembly process of the return pin will be described with reference to FIG. 5. First, the operator places the return body 111 on the lower surface of the upper plate 200, and inserts the buried end 113 into a through hole (not shown) formed through the upper plate 200. The upper surface of the locking piece 112 is inserted until it is in close contact with the lower surface of the upper contact plate 200. Therefore, the end of the buried end 113 is exposed to the upper surface of the upper sealing plate 200.

Therefore, the worker inserts the fastening end 131 of the connection portion 130 into the buried end 113 through the end surface of the buried end 113. At this time, the inside of the fastening end 131 and the buried end 113 is formed with a coupling configuration that is matched to each other.

More preferably, the fastening end 131 and the buried end 113 are fastened by inserting a fixing means such as a screw into the insertion hole 132a formed at the upper end of the connection body 132.

As such, since the coupling part 130 and the pin part 110 are coupled to each other by the fixing means such as the screw, the coupling state can be firmly maintained even when a pressure is applied during the driving of the upper contact plate 200.

As described above, the connection portion 130 and the pin portion 110 is screwed into the fastening end 131 through the insertion hole 132a is formed in the upper end of the connecting body 132 is fastened Each of the upper side plates 200 is fixed.

Through this process, the return pin 100 is fixed to the upper contact plate 200. At this time, the elastic member 120 has a position corresponding to the groove inward from the bottom of the upper fixing plate 11 is fitted to the outer surface of the connecting body.

Here, the present invention can be fixed to the outer surface of the connecting member 132 by the elastic member 120 is fitted into another groove as the elastic member 120 is seated on the upper fixing plate 11 as another application example Without having to proceed withdrawal of the undercut.

Since the process of injecting the undercut product in the injection mold is generally the same, a detailed description thereof will be omitted, and the operation of the present invention will be described through a process of taking out the molded undercut product. Here, the configuration of the remaining movable mold 20 and the fixed mold 10 except for the integrated return pin 100, which is the main point of the present invention, will be described as an example with reference to the configuration and reference numerals of FIG.

In the movable mold 20, resin is injected into the cavities 23a and 12a of the lower plate 23, and the inclined core 16 is formed at the portion corresponding to the undercut in the cavities 12a and 23a. 200) and an end thereof is positioned at the undercut.

When the undercut product is taken out, the spacer block 13, the upper plate 12, and the upper fixing plate 11 are driven by the control of a control unit (not shown in the drawing) to control the device. 120 is applied a predetermined pressure.

Therefore, the upper contact plate 200 is applied downward to move the inclined core 16 in the inclined direction while being lowered toward the movable mold side by the elasticity of the elastic member 120 and then upward again.

That is, the inclined core is lowered to a position lower than the undercut of the molded product 30 by the force applied while the upper plate 200 is downward, and then the upper plate 200 is upwardly raised to the undercut molded product 30. It is extracted by applying force in the inclined direction.

In this way, the upper side plate 200 is moved up and down by the elasticity of the elastic member 120, the return pin 100 is supported so that the upper side plate 200 can be flowed up and down simply by elasticity do. That is, the upper contact plate 200 may be returned to the original position by the return pin 100.

As described above, the return pin and the elastic member 120 may be integrally formed and fixed to the upper contact plate 200, and the utilization of the undercut product may be easily performed. In particular, since the elastic member 120 and the return pin 100 are integrally configured, the configuration can be simplified, and the assembly labor can be shortened, thereby greatly reducing the manufacturing cost.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

100: return pin 110: pin portion
111: return body 112: locking piece
113: buried end 120: elastic member
130 connection part 131 fastening end
132: connecting body 132a: insertion hole

Claims (7)

In the undercut processing apparatus of the injection mold having an inclined core and a return pin which is fixed to the upper side of the sheet to be moved up and down by the elastic force of the elastic member to take out the undercut products formed in the cavity,
The return pin is an integral return pin formed integrally with an elastic member for applying an elastic force to the upper contact plate,
The integrated return pin is penetrated and fixed from one surface of the upper contact plate to the opposite surface to fit the elastic member,
The integrated return pin extends toward the movable mold side, and includes a pin part inserted into one side of the upper contact plate and fixed at an end thereof.
The pin portion includes a return body extending toward the movable mold side; A latching piece extending laterally from an outer surface of the return body to be in close contact with one surface of the upper contact plate; And a buried end extending in the vertical direction from the locking piece to be inserted into the upper side of the upper plate, and having an insertion hole having an inner surface extending from the end surface thereof. The method of claim 1, wherein the integrated return pin
It is connected to the lower side of the pin portion on the opposite side of the upper contact plate, the elastic member includes a connecting portion fitted to the outer surface,
The landfill stage
An end mold of the injection mold undercut processing apparatus, characterized in that formed on the inner surface of the outer surface coincides with the front end of the connecting portion. delete delete The connector according to claim 2,
A fastening end extending in one direction so as to be inserted into an end surface of the buried end which is formed at an end from the other surface of the upper contact plate; And
An injection mold undercut processing apparatus having a connecting body extending downward from the fastening end to which the elastic member is fitted. The method of claim 2, wherein the buried end
Undercut processing apparatus of the injection mold with a return pin, characterized in that the thread is formed on the inner surface of the insertion hole. The method of claim 5, wherein the connection portion
An insertion hole penetrating from an opening formed at an upper end surface of the connecting body to an end of the fastening end; And
And a screw inserted into the insertion hole and screwed to an inner surface of the buried end, wherein the undercut processing apparatus of the injection mold has a return pin.

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