KR102451482B1 - Jig for fixing insert at plastic injectionmoulding - Google Patents

Abstract

The present invention relates to a multi-division jig for processing a hole in an injection mold, which can adopt a structure capable of simply replacing a pin by arbitrary attachment and detachment of a bar and the pin, unlike an existing method in which as a bar as the body of a jig and a pin for forming a hole in an injection molded article was integral, it was required to replace the jig when the pin was damaged, to double the efficiency of production, management, and replacement of the jig, and can be divided and provided every specific length to facilitate handling, use, and maintenance thereof, such as adjusting the length of the bar and facilitating the storage thereof, caused by a structure differentiated from an existing structure, thereby maximizing user convenience and efficiency. The multi-division jig comprises: a sleeve unit (10) installed from a mold (1) toward a cavity (2); and a core unit (20) of which the length is adjusted by extension coupling in a divided state, and which is led out of or in the cavity in the inner space of the sleeve unit (10) to guide processing of a hole in the injection molded article.

Description

Multi-segment jig for hole processing in injection molds {Jig for fixing insert at plastic injectionmoulding}

The present invention relates to a structure of a pin-type jig that is drawn out from a mold and penetrates a cavity to induce a hole to be formed in an injection product, and more particularly, to a bar that becomes the body of the jig and a hole is formed in the injection product Unlike the existing method in which the entire jig had to be replaced when the corresponding pin is damaged as the pin is integrated, a structure that allows simple replacement of the pin is adopted due to the arbitrary detachment of the bar and the pin. This not only doubles the efficiency of production, management, replacement, etc. of the jig, but also divides the bar for each specific length and provides handling resulting from a differentiated structure, such as adjusting the length of the bar and making it easier to store. It relates to a multi-split type jig for hole processing of an injection mold, which maximizes the convenience or efficiency of use due to overuse, ease of maintenance and repair, etc.

In general, in order to connect different parts to each other, holes corresponding to each other are drilled on the mating surfaces of each part, and the holes are arranged concentrically, and then fastened through bolts or screws. .

These holes are generally divided into a method using a drill and a method using an injection mold. It is generally used for parts that are easily deformed.

In the hole forming method using the injection molding method, a pin having the same diameter as the inner diameter of the hole is installed at each position where the hole is to be formed on the cavity of the mold, and injection of the injection liquid is blocked only in the area where the pin is located. Thus, a hole having a diameter corresponding to the pin is formed.

On the other hand, in the industry, the aforementioned pin is referred to as a sleeve pin, and this sleeve pin is used as a fixing pin for fixing the insert to the mold as well as for the purpose of forming a hole in the product. .

As one of the technical examples related to the sleeve pin, registered Utility Model Publication No. 20-0376455 "Sleeve pin for fixing plastic injection insert" is published. This technology forms a concave-convex processing structure in the insert connection part of the upper part of the body that forms the pin, so that the insert such as a engraving mold is fixed to the main mold, reduces the defect rate due to insert departure, and prevents mold accidents in advance. suggest technology.

As another example of the technical examples related to the sleeve pin, published Utility Model Publication No. 20-2009-0017110 "Sleeve Pin Structure of Injection Molding". This technology reinforces the rigidity of the sleeve pin and the pin in the sleeve to prevent the sleeve pin and the pin in the sleeve from being damaged during mass production, and not only simplifies the structure of the injection mold, but also makes maintenance and replacement of the injection mold and the sleeve pin easier. It is easy and proposes a technology that can reduce the manufacturing cost by reducing the material cost.

As another example of the technical examples related to the sleeve pin, Korean Patent Application Laid-Open No. 10-2006-0090726 "Sleeve height adjusting device" is disclosed. The technology includes a cylindrical sleeve having a hollow portion, which is a passage through which the sleeve pin moves, and a fixing piece for supporting the sleeve, but a plurality of height adjustment track grooves arranged at regular intervals in the height direction are formed on the outer circumferential surface of the sleeve, and fixed On the side, the structure and technology of the height adjustment pin that is selectively inserted into the height adjustment track groove to fix the sleeve is proposed.

Most of the sleeve pins are composed of a round bar-shaped sleeve unit and a core unit that enters a preset hole due to the drawing-out and drawing-in operations in a state embedded in the sleeve unit, and the thickness of the pins provided in each unit according to the size of the hole is specified In particular, for small products or products that require the intervention of screws or bolts of small dimensions, the diameter of the pins is inevitably narrow, and these pins are constantly deformed or broken in the process of mass production. have.

Due to the structural characteristics of the existing sleeve pin consisting of a bar and a pin, if the pin is damaged, the entire bar and pin must be replaced inevitably, so the entire process of use, management, and reproduction All of this is inefficient. Even if the bar and pin are separated, the bar and pin itself are very long, so if any part is damaged, the whole must be replaced.

Therefore, there is an urgent need to develop a sleeve pin (Sleeve pin), that is, a hole processing jig, capable of alleviating all of the above-mentioned problems.

Utility Model Registration No. 20-0376455 "Sleeve pin for fixing plastic injection insert" Public Utility Model Publication No. 20-2009-0017110 "Sleeve pin structure of injection mold" Laid-Open Patent Publication No. 10-2006-0090726 "Sleeve height adjustment device"

The present invention was created to more actively solve the above problems, and provides a multi-division jig for hole processing of an injection mold that allows simple replacement of pins by arbitrary detachment of bars and pins. is the main problem to be solved.

In addition, the present invention is another problem to provide a multi-division type jig for hole processing of an injection mold that maximizes the efficiency of the overall process by proposing a bar and a pin having a structure that can be quickly and easily detached.

In addition, the present invention is another problem to provide a multi-division jig for hole processing of an injection mold excellent in maintenance and management by allowing only the section to be easily replaced when any part of the bar is damaged.

In addition, the present invention improves and supplements the structure to actively withstand the external force continuously applied to the joint parts between the divided parts, thereby providing not only convenience in use but also the provision of technology that can ensure the long life of the jig. Another problem to be solved do it with

The configuration of the multi-division jig for hole processing of the injection mold proposed in the present invention in order to achieve the above-mentioned problem is as follows.

The jig 100 of the present invention is a sleeve unit 10 installed from the mold 1 toward the cavity 2; and the length is adjusted by extension coupling in a divided state, and the sleeve unit 10 The core unit 20 is drawn out or drawn into the cavity from the internal space to induce hole processing in the injection product; characterized in that it is composed of a.

In addition, the core unit 20 includes a core bar 21 that is horizontally moved by an external force while being accommodated inside the sleeve unit 10; and a core cap 22 coupled to the tip of the core bar; and a core cap. and a core pin 23 extending in the horizontal direction from the end of the shaft and drawn into the cavity 2 along a path provided by the sleeve unit 10 along with the movement of the core bar.

In addition, the core bar 21 has the shape of a round bar, and a locking jaw 21-1a is further formed at one end, and an external cylinder is coupled to the locking jaw, so that inlet and withdrawal operations within the sleeve unit 10 . The first body 21-1, which is provided with power so that this can be achieved; and the first body extending in front of the first body and allowing the coupling of the core cap 23 to the end of the first body, thereby reducing the space for the arrangement of the core pins 23 and a second body 21-2 provided.

In addition, the second body 21-2 includes a rod 21-2a that is extended and fastened from the first body 21-1; and extends and protrudes from the end of the rod to provide a space for the arrangement of the core pin 23. an adapter 21-2b that allows the insertion of the core cap 23; and a coupling hole (21-2c) penetrating the adapter vertically and allowing the pin to be fixed with the core cap.

In addition, the second body 21-2 includes a fixing jaw 21-2d that protrudes in a semicircular shape from an end of the adapter 21-2b, and the core pin 23 has a fixed jaw at an end portion of the core pin 23. It consists of a one-to-one correspondence with the semicircle of (21-2d), and includes the constraint of rotational motion caused by mutual mating.

In addition, the second body 21-2 is a flat portion 21-2e formed by cutting a portion of the upper end of the portion to which the first body 21-1 is fastened; and is seated and fixed to the flat portion. and a coupling piece (21-2f) surrounding the first body inserted into the second body.

On the other hand, the coupling piece (21-2f) has a restraining projection (21-2g) protruding downward from the bottom is fitted into the restraining groove (21-1c) formed in the first body (21-1) to induce mutual restraint. include more

According to the present invention having the above-described configuration, the bars and pins provided in the sleeve unit and the core unit can be selectively detached, and the bar can be multi-divided and assembled and disassembled. Even if a specific part is damaged, partial replacement is possible rather than full replacement, making replacement parts easier to produce, and all work environments in which the jig is used, such as production, management, replacement, and storage, are improved more effectively and efficiently. have the effect of being

In addition, the present invention is very effective because it is possible to actively prevent breakage of the coupling portion from frequent external forces by adding a coupling piece to the coupling portion between the divided parts to improve the bonding strength and durability.

In addition, the present invention relates to a simple act of intervening or removing a fixing pin in a coupling hole that is vertically penetrating concentrically on each coupling surface of the sleeve bar and the sleeve cap or the core bar and the core cap. It is more effective because damaged parts can be replaced quickly and easily because arbitrarily disassembly or assembly of the product is possible.

1 is a perspective view of a multi-division jig for hole processing of an injection mold constructed according to a preferred embodiment of the present invention.
Figure 2 is an exploded perspective view of Figure 1;
3 is an exploded perspective view of a split-type core unit;
4 is an exploded perspective view showing a coupling relationship between a second body and a core pin in the core unit;
5 is an exploded perspective view showing a coupling relationship between a second body, a core pin, and a core cap;
6 is an exploded perspective view showing the coupling structure of the anti-rotation type core unit.
7 is an exploded perspective view showing a coupling relationship between a second body, a core pin, and a core cap in the anti-rotation type core unit;
8 is an exploded perspective view showing a structure in which a coupling piece is installed to reinforce a coupling portion of the split type core unit;
Figure 9 is a bottom perspective view of the coupling piece proposed by the present invention.
10 is a cross-sectional view of a core bar sequentially illustrating a coupling structure of a coupling piece;
11 is a cross-sectional view of a multi-split type jig for hole processing of an injection mold proposed by the present invention.
Figure 12 is a state diagram showing the state in which the multi-division jig for hole processing of the injection mold proposed by the present invention is installed in the mold.

Hereinafter, with reference to the accompanying drawings, it will be collectively described for the configuration of the present invention, its action and effect.

Advantages and features of the present invention, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only this embodiment completes the disclosure of the present invention, and common knowledge in the technical field to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. In addition, like reference numerals refer to like elements throughout the specification.

The present invention relates to a fin-type jig structure that induces a hole to be formed in an injection product by being drawn out from a mold and passing through a cavity.

Above all, the present invention is different from the conventional method in which the entire jig has to be replaced when the corresponding pin is damaged as the bar, which is the body of the jig, and the pin, which forms a hole in the injection product, are integrally formed. By adopting a structure that allows simple replacement of pins due to arbitrary detachment of ) and pins, the efficiency of production, management, replacement, etc. of the jig is doubled, and the bar is divided for each specific length and provided. Multi-segment type for hole processing of injection molds that maximizes convenience and efficiency due to ease of handling, use, maintenance and repair, etc. Note that it is related to the jig.

Prior to explaining the present invention, in general, a hole processing jig has a total length of about 900 to 950 mm, and a diameter of about 8 to 10 mm, which is the body of the jig. Even with such a thin thickness, a long bar has poor production efficiency due to unnecessary material waste and difficult processing rate, and a thin pin is continuously applied during the molding process when the number of punches per minute is several hundred units. Problems such as failure to withstand external forces and breakage occurred. If the pin or bar is damaged in this way, there is no choice but to replace the entire jig, which reduces work efficiency and the efficiency of product management extremely, so active improvement is required.

Therefore, the present invention not only improves the overall structure of the jig within the range that does not significantly change the product production, but also actively prevents pin breakage, and even if a pin or bar is broken, only related parts can be quickly and easily replaced. We would like to provide a jig of the structure.

1 and 2, the jig 100 of the present invention is a sleeve unit 10 installed to face the cavity 2 from the mold 1; and the length is adjusted by extension coupling in a divided state. , the core unit 20, which is drawn out or drawn into the cavity from the inner space of the sleeve unit 10 to induce hole processing in the injection product;

The jig 100 of the present invention according to the above configuration is due to the fact that each end of the sleeve unit 10 and the core unit 20 as well as a specific part of the core unit can be arbitrarily attached and detached. can do.

The sleeve unit 10 is composed of a sleeve bar 11 constituting the body, a sleeve cap 12 coupled to the tip of the sleeve bar, and a sleeve pin 13 installed to extend horizontally from the end of the sleeve cap. .

The sleeve bar 11 is made of a cylindrical body that is internally communicated up and down, and one of both ends of the sleeve bar is connected to the mold 1 , and is preferably fixedly arranged to face the cavity 2 . The sleeve bar 11 includes a pair of chamfered portions (C) formed by cutting both ends of the front end to provide a gripping space for an equipment tool such as a spanner or to induce precise seating of the sleeve bar in the mold. The sleeve bar 11 has a length of about 300 to 350 mm and a diameter of about 20 to 30 mm for a structure optimized for molding operations such as appearance, strength, and rigidity.

The sleeve cap 12 is coupled to the tip of the sleeve bar 11 by a tab (TAP) and a fixing pin (P), and has a structure that can be quickly and easily separated depending on whether the fixing pin is intervened.

The sleeve pin 13 extends horizontally from the end of the sleeve cap and has a reduced diameter compared to the sleeve bar. The sleeve pin 13 has a cylindrical shape for insertion of a core pin 23 to be described later, and according to a preferred embodiment of the present invention has a length of about 100 to 150 mm and a diameter of about 3 to 5 mm.

The sleeve pin 13 having the above structure serves to guide the core pin 23 so that it can be stably drawn out without being bent or broken to reach the cavity 2 accurately.

The core unit 20 includes a core bar 21 that is horizontally moved by an external force while being accommodated inside the sleeve unit 10; and a core cap 22 coupled to the tip of the core bar; and an end of the core cap. The core pin 23 extends in the horizontal direction and is drawn out into the cavity 2 along the path provided by the sleeve unit 10 along with the movement of the core bar.

The core bar 21 is formed in the shape of a shaft having a diameter corresponding to the inner diameter of the sleeve bar 11, and is slid in the horizontal direction by an external force while being interposed in the inner diameter of the sleeve bar. The core bar 21 has a length of about 350 to 400 mm as a whole, and a diameter of about 10 to 12 mm corresponding to the inner diameter of the sleeve bar 11 .

The core bar 21 may have a length of about 350 to 400 mm, that is, may be provided in a single form, or may be provided in a divided or multi-divided form with different lengths. For example, when the core bar 21 is divided, it may be divided into a first body 21-1 and a second body 21-2.

The first body 21-1 has the shape of a round bar, and a locking jaw 21-1a is further formed at one end, and an external cylinder is coupled to the locking jaw to enter and withdraw in the sleeve unit 10 . Power is provided so that the operation can be achieved, and the second body 21 - 2 extends and engages in front of the first body, and allows the core cap 23 to be coupled to the end of the core pin 23 . provides

The first body 21-1 has a length of about 250 to 260 mm, and the second body 21-2 has a length of about 100 to 140 mm. When combined, the core bar 21 has a length of about 350 to 400 mm. ) is provided.

On the other hand, in the case of the multi-division, each body is divided into units of 50 mm or 100 mm, and each body is assembled to provide the core bar 21 of about 350 to 400 mm, or the length of the core bar by removing one or more bodies. can also be adjusted.

The first body 21-1 and the second body 21-2 may be assembled by force fitting with each other, or may be assembled by fastening bolts with threads formed on their mating surfaces, and may be assembled by force fitting with each other. It can also be assembled in a pin fixing method that is vertically through-fastened in the state in which it is fixed.

The reason that the core bar 21 is divided into the first body 21-1 and the second body 21-2 to several bodies as described above is that precision is actively improved when machining the core bar, and since it is in a divided state, It makes transport and storage convenient, and in particular, when a specific part of the core bar is damaged, only the damaged part can be replaced and used because it is economically superior.

The second body 21-2 includes a rod 21-2a extending and fastened from the first body 21-1; and a core cap extending and protruding from an end of the rod body to provide an arrangement space for the core pin 23. (23) an adapter (21-2b) that allows the insertion; and a coupling hole (21-2c) that vertically penetrates the adapter and allows the pin fixation with the core cap;

As shown in FIG. 5 , the adapter 21-2b has a flat end so that the core pin 23 is closely disposed, and in a state in which the core pin is closely disposed on the adapter, the core cap 22 passes through the core pin and is coupled. Accordingly, the coupling of the core unit 20 is completed.

And as shown in FIG. 6 , the adapter 21-2b has a semi-circular fixed jaw 21-2d protruding from the end thereof, and the core pin 23 has a fixed jaw on the contact surface with the adapter 21-2b ( 21-2d) and corresponding semicircles are formed in the reverse direction and are closely arranged by mating. In a state in which the core pin is closely disposed on the adapter, the core cap 22 penetrates through the core pin and is coupled, thereby completing the coupling of the core unit 20 .

In the case of FIG. 5 , the core pin 23 is a coupling structure that rotates freely, and in the case of FIG. 6 , the core pin is engaged with the fixing jaw 21-2d of the adapter 21-2b to prevent rotation.

The core pin 23 is extended in the horizontal direction from the end of the core cap 22 and is drawn out into the cavity 2 along the path provided by the sleeve pin 13 along with the movement of the core bar 21, As a result, as injection of the injection liquid is blocked only in the region where the pin is located, a hole having a diameter corresponding to the pin is formed.

On the other hand, the diameter of the core pin 23 is configured to be about 2 to 3 mm so as to be inserted into the inner diameter of the sleeve pin 13, and the length of the core pin is the length of the cavity 2 in a state embedded in the sleeve pin. It consists of about 200 to 250 mm to reach the set position.

The core pin 23 having the above structure is stably drawn out without being bent or broken in the process of being drawn out from the inner diameter of the sleeve pin 13 toward the cavity 2 to accurately reach the preset position of the cavity 2 . can

On the other hand, as described above, in the present invention, the core bar 21 is multi-divided for convenience of processing, ease of transport and storage, diversity according to length adjustment, high efficiency by partial replacement of damaged parts, and durability increase. .

The core bar 21 is a component that repeatedly performs pulling-in/out operations in the inner space of the sleeve unit 10 and continuously endures excessive external shocks during hole processing, and high durability must be the basis. However, in the split-type core bar 21 , the connection portion between the first body 21-1 and the second body 21-2 is inevitably vulnerable to impact, so a technology capable of supplementing this is required.

Therefore, the present invention proposes a structure in which the coupling piece 21-2f is fastened to the connection portion between the first body 21-1 and the second body 21-2.

8, the second body 21-2 includes a flat portion 21-2e formed by cutting a portion of the upper end of the portion to which the first body 21-1 is fastened; and, seated on the flat portion and and a coupling piece (21-2f) which is fixed and surrounds the first body inserted into the second body.

As shown in FIG. 10 , the coupling piece 21-2f has a semicircular shape, and when it is installed on the second body 21-2, the upper portion of the flat part 21-2e is filled to form the outer diameter of the second body. . The coupling piece 21-2f includes a vertically formed through hole, and the coupling piece is constrained to the second body by being fastened to the flat portion 21-2e through the corresponding through-hole screw or bolt vertically.

In particular, the coupling piece 21-2f includes a constraining protrusion 21-2g protruding downward from the bottom surface, and the constraining protrusion is at any one end of the first body 21-1, that is, the second body 21- 2) is caught by the fitting protrusion (21-1b) to which the coupling is induced to strengthen the binding force. The fitting protrusion 21-1b of the first body 21-1 has a restraining groove 21-1c formed on one surface along the circumference, and the restraining protrusion 21-2g is mounted in the restraining groove.

As described above, in the second body 21-2, an insertion hole is formed at one end so that the first body 21-1 can be coupled, and the thickness of the corresponding part is reduced due to the insertion hole, and thus it may be damaged even by a small impact. There are concerns. However, as in the present invention, a flat portion 21-2e is formed in the corresponding portion, the coupling piece 21-2f is mounted on the flat portion, and the restraining protrusion 21-2g of the coupling piece is formed with the fitting protrusion 21-1b. ), it is possible to compensate for the reduced thickness of the second body due to the insertion hole as it is caught in the constraint groove 21-1c. Therefore, the installation of the coupling piece (21-2f) can reinforce the coupling portion of the first body and the second body to protect it from external force.

The jig 100 of the present invention having the configuration as described above can selectively detach a bar and a pin provided in the sleeve unit 10 and the core unit 20, and also a bar. By disassembling and disassembling the parts, even if a specific part is damaged, it is possible to replace the parts rather than the whole, thus making the production of replacement parts easier, as well as the series of jigs used in production, management, replacement, and storage. All work environments are improved more effectively and efficiently.

In addition, by adding the coupling piece (21-2f) to the coupling portion between the divided parts, coupling strength and durability are improved, so that it is possible to actively prevent damage to the coupling portion from frequent external forces. In addition, a simple act of intervening or removing a fixing pin into a coupling hole formed concentrically and vertically through each coupling surface of the sleeve bar 11 and the sleeve cap 12 or the core bar 21 and the core cap 22 Because the bar and pin can be disassembled or assembled at will, damaged parts can be replaced quickly and easily.

Although the present invention described above has been described with reference to an embodiment shown in the drawings, this is merely exemplary, and various modifications and equivalent other embodiments are possible by those skilled in the art. should be made clear. Accordingly, the true technical protection scope of the present invention should be construed by the appended claims, and all technical ideas within the equivalent scope should be construed as being included in the scope of the present invention.

1. Mold 2. Cavity
10. Sleeve unit 11. Sleeve bar
12. Sleeve Cap 13. Sleeve Pin
20. Core unit 21. Core bar
22. Core Cap 23. Core Pin
100. Jig

Claims (6)

The sleeve unit 10 is installed to face the cavity (2) from the mold (1); and a core unit 20, whose length is adjusted by extension coupling in a divided state, and is drawn out or drawn into the cavity from the inner space of the sleeve unit to induce hole processing in the injection product; In the multi-segment jig,
The core unit 20 includes a core bar 21 that is horizontally moved by an external force while being accommodated inside the sleeve unit 10; and a core cap 22 coupled to the tip of the core bar; and an end of the core cap. and a core pin 23 extended in the horizontal direction and drawn into the cavity 2 along a path provided by the sleeve unit 10 along with the movement of the core bar; and
The core bar 21 has the shape of a round bar, and a locking jaw 21-1a is further formed at one end, and an external cylinder is coupled to the locking jaw, so that the retracting and withdrawing operations within the sleeve unit 10 are achieved. a first body 21-1 that is provided with power to be lost; and a second body 21-2 extending and coupled to the front of the first body and allowing the coupling of the core cap 23 to the end to provide an arrangement space for the core pin 23; Multi-segment jig.
delete delete The method of claim 1,
The second body 21-2,
a rod body 21-2a extended and fastened from the first body 21-1;
an adapter 21-2b extending from the end of the rod body and allowing insertion of the core cap 23 while providing an arrangement space for the core pin 23;
a coupling hole (21-2c) that vertically penetrates the adapter and allows the pin to be fixed with the core cap;
A multi-segment jig for hole processing of an injection mold comprising a.
5. The method of claim 4,
The second body 21-2 includes a fixing jaw 21-2d that protrudes in a semicircular shape from the end of the adapter 21-2b,
The core pin 23 is a multi-split type jig for hole processing of an injection mold, wherein a portion of the end portion is formed in a one-to-one correspondence with the semicircle of the fixing jaws 21-2d, so that rotational movement due to mutual engagement is restricted.
The method of claim 1,
The second body 21-2,
a flat portion 21-2e formed by cutting a portion of an upper end of a portion to which the first body 21-1 is fastened;
a coupling piece (21-2f) that is seated and fixed on the flat part and surrounds the first body inserted into the second body;
A multi-segment jig for hole processing of an injection mold comprising a.

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