KR19990020314U - Slide core positioning structure of mold base - Google Patents

Abstract

The present invention discloses a slide core positioning structure of a mold base. The slide core positioning structure of the conventional mold base has a problem that the position of the slide core cannot be set accurately because it is determined only by the elastic force of the return spring that the slide core is moved to the initial position. The present invention has a return spring interposed between the core and the side surface of the slide core to impart a predetermined elastic force to return the slide core past its initial position, and the reference hole to have an entrance in which the tip is gradually narrowed on one side of the core installation hole. Is formed, and the stopper is mounted to the inlet of the reference hole toward the core installation hole so that the stopper can be mounted, and the stopper is caught on the lower surface of the slide core so that the movement of the slide core is restricted from the initial position. Is formed. Therefore, the simple configuration and structure in which the initial position of the slide core is precisely regulated by the stopper eliminates the combination defect between the core and the slide core, thereby improving productivity and eliminating unnecessary work time. do.

Description

Slide core positioning structure of mold base

The present invention relates to a mold base for injection molding, and more particularly, to a slide core positioning structure of a mold base so that the position of a slide core can be accurately determined.

Injection molding is a method of manufacturing a product having a predetermined shape and dimension by injecting a molten molding material, for example, a thermoplastic resin, into a cavity of a mold base, and injection molding is generally performed automatically by an injection molding machine. The mold base required for injection molding is configured to be divided into a pair of fixed and movable templates.

Looking at one example of such an injection molding method, the injection molding machine is a heating cylinder for melting a molding material supplied from a hopper by heating, and a mold base for molding a molding material in a molten state by heating of the heating cylinder. Can be divided into The mold base is configured such that a pair of stationary and movable templates have cavities on their parting line. Here, the cavity is usually formed in the dividing surface of the stationary template, the stationary template is fixed to the heating cylinder, and the cavity is selectively opened and closed by the operation of the movable template. The movable template is actuated by the operation of the clamp mechanism, and the injection molding machine is equipped with an eject mechanism for removing the molded article in the molded state from the cavity of the mold base.

Therefore, when a predetermined time elapses after the molten molding material is injected into the cavity by heating the heating cylinder while the cavity is closed by the operation of the movable template, the cavity is opened by the operation of the movable template and ejected. The injection-molded article molded by the operation of the mechanism is pushed out of the cavity and then solidified to produce a desired article.

Injection molding, on the other hand, can produce a variety of different types of objects, such as panels, boards, boxes, and cylindrical containers, and electronics such as video cassette recorders (VCRs) and compact disc players (CDPs). It is used for manufacture of a cover. As an example of an electronic product, in the case of a video cassette recorder, a chassis and a front panel are manufactured by injection molding, and bosses, pins, holes, etc. are formed in the chassis and the front panel of the video cassette recorder.

As shown in FIG. 1, in the mold base 10, a fixed template 12 is assembled to one side of the fixed mounting plate 11, and a cavity 13 is formed on a divided surface of the fixed template 12. Is formed. In the mold base 10, a space block 15 and a movable template 16 are assembled to one side of the movable mounting plate 14, and a core mounting hole 17 is formed in a divided surface of the movable template 16. do. The core 18 is provided in the core mounting hole 17 of the movable template 16, and the core 18 is fitted to the cavity 13 of the stationary template 12 to form the desired injection molded product P. Is achieved.

In addition, upper and lower contact plates 19 and 20 are respectively mounted at the center of one surface of the movable template 16, and eject pins 21 are mounted at one side of the lower contact plate 20, and the other of the lower contact plate 20 is provided. A return pin 22 is attached to the side, and a spring 23 for imparting a predetermined elastic force is attached to the outer circumferential surface of the return pin 22.

In addition, the guide pin bush 24 is disposed and mounted on the fixing template 12, and the guide pin 25 is fitted to the core 18 in a corresponding relationship with the guide pin bush 24. Are mounted. The core 18 is fitted to the cavity 13 by fitting the guide pins 25 into the guide pin bushes 24 correspondingly to each other.

On the other hand, in order to form projections (or protrusions) such as bosses, grooves, holes, etc. on the side surfaces of the injection molded product P, the core mounting holes 17 of the movable template 16 can be slidably moved in the left and right directions. The slide core is adopted. That is, the projection of the injection molded article P is formed by the combination of the core 18 and the slide core 30.

2A and 2B, the slide core positioning structure of the mold base has the slide core 30 so as to be positioned at the side of the core 18 in the core mounting hole 17 of the movable template 16 described above. Is provided, and the return spring 31 which imparts a predetermined elastic force is interposed between the core 18 and the side surface of the slide core 30. Guide grooves 32 inclined at a predetermined angle from the center to the outside are formed on the upper surface of the slide core 30, and the guide grooves 32 of the slide core 30 correspond to each other on the lower surface of the fixed template 12. An angular block 35 is fitted to fit the slide core 30 to selectively move the slide core 30.

Therefore, the angler block 35 of the fixed template 12 in the process of moving the movable template 16 by the operation of the clamp mechanism described above, that is, closing the cavity 13 of the fixed template 12. The slide core 30 is moved toward the side surface of the core 18 together with the movement of the movable template 16 while being fitted in the guide groove 32 of the slide core 30 corresponding to each other. On the contrary, if the angler block 35 is removed from the guide groove 32 of the slide core 30 in the process of opening the cavity 13 of the stationary template 12 by the movement of the movable template 16. The slide core 30 is moved away from the side surface of the core 18 by the elastic force of the return spring 31.

However, in the slide core positioning structure of the conventional mold base as described above, the angler block 35 may be fitted in the slide core 30 in its initial position, that is, the guide groove 32 of the slide core 30. Since the movement to the position is determined only by the elastic force of the return spring 31, there is a problem that the position of the slide core 30 is not set correctly. In detail, the return spring 31 is deteriorated over time, that is, its performance or function is degraded due to corrosion, physical properties, etc., including natural deterioration with time. Due to the repeated use of the mold base 10, the elastic force of the return spring 31 is easily lowered to prevent the slide core 30 from returning to the initial position. As a result, a combination failure of the core 18 and the slide core 30 occurs, thereby lowering the productivity.

In order to solve such a problem, it is necessary to replace the return spring 31 having a degraded function with a new one. When replacing the return spring 31, the core 18 and the slide core 30 of the mold base 10 are replaced. Since disassembly was required, workability was significantly reduced, such as unnecessary work time.

The present invention has been made to solve the conventional problems as described above, the object of the present invention is to provide a slide core positioning structure of the mold base to accurately determine the position of the slide core by a simple configuration and structure have.

1 is a cross-sectional view showing a general mold base,

2A and 2B are cross-sectional views showing a slide core positioning structure of a conventional mold base;

3A is a cross-sectional view showing a slide core positioning structure of a mold base according to the present invention;

3B is a sectional view showing an operating state of FIG. 3A.

♣ Explanation of symbols for the main parts of the drawing ♣

10: mold base 11: fixed mounting plate

12: fixed template 13: cavity

14: operation mounting plate 16: operation template

17: core mounting hole 18: core

40: slide core 41: return spring

50: reference hole 51: inlet

52: spring 53: stopper

55: Position Control Home P: Injection Molded Product

A feature of the present invention for achieving the above object is a core mounting hole in which a fixed template assembled to have a cavity on one side of the fixed mounting plate, and a core assembled on one side of the movable mounting plate and fitted to the cavity of the fixed template. In a mold base having a movable template provided in the base plate and a slide block which is installed in the core installation hole of the movable template to be movable so as to be combined with the core, the slide core has an initial position between the core and the side surface of the slide core. A return spring is provided to impart a predetermined elastic force so as to return over. The reference hole is formed on one side of the core installation hole so as to have an inlet in which its tip gradually narrows. A stopper is mounted so that it can be selectively mounted on the bottom of the slide core. Alternatively hanging in the slide core positioning structure of the mold base to which the movement of the slide core position regulating groove is formed so as to be regulated in the initial position.

Hereinafter, one preferred embodiment of a slide core positioning structure of a mold base according to the present invention will be described in detail with reference to the accompanying drawings.

3A and 3B are views for explaining the slide core positioning structure of the mold base according to the present invention, and the basic configuration of the mold base described in FIG. 1 will be described with the same reference numerals.

First, referring to FIGS. 1 and 3A, the mold base 10 has a fixed mounting plate 11 installed in a heating cylinder of the injection molding machine described above, and a fixed template 12 on one side of the fixed mounting plate 11. ) Is assembled by fastening, and the cavity 13 is formed on the divided surface of the stationary template 12.

In the mold base 10, the movable mounting plate 14 is attached to the clamping mechanism of the injection molding machine, and the space block 15 and the movable die plate 16 are assembled to one side of the movable mounting plate 14 by fastening, respectively. The core mounting hole 17 is formed in the divided surface of the movable template 16, and the core 18 is provided in the core mounting hole 17 of the movable template 16. As shown in FIG. The core 18 is fitted in a relationship corresponding to each other in the cavity 13 of the stationary template 12 to form the desired injection molded article P. At this time, the movable mounting plate 14 is moved by the clamp mechanism to open or close the cavity 13 of the stationary template 12. In this way, when the molding material in the molten state is injected from the heating cylinder into a shape in which the cavity 13 and the core 18 are fitted, a desired injection-molded article P is produced.

In addition, upper and lower contact plates 19 and 20 are mounted at the center of one surface of the movable template 16, and eject pins 21 are mounted at one side of the lower contact plate 20, and the eject pins 21 are ejected. The molded article P is pushed out of the cavity 13. At this time, the space in which the upper and lower plates 19 and 20 can move upward and downward is secured by the space block 15. A return pin 22 is mounted on the other side of the lower plate 20, and a spring 23 for imparting a predetermined elastic force is mounted on the outer circumferential surface of the return pin 22, and the return pin 22 is fixed and movable template ( When the 12 and 16 are closed, the upper and lower plates 19 and 20 are returned to their initial positions.

A plurality of guide pin bushes 24 are disposed and mounted on the fixing template 12, and a plurality of guide pins 25 are inserted into the core 18 so as to be fitted in a corresponding relationship with the guide pin bushes 24. Is mounted. The core 18 is fitted to the cavity 13 by fitting the guide pins 25 into the guide pin bushes 24 correspondingly to each other. That is, the guide pin bushes 24 and the guide pins 25 serve as guides for accurately fitting the fixed and movable templates 12 and 16, where the guide pin bushes 24 and the guide pins 25 are used. ) Are about four used.

As shown in FIG. 3A and FIG. 3B, the slide core 40 is provided in the core installation hole 17 of the said movable template 16 so that it may be located in the side surface of the core 18, The core 18 and the slide core Between the side surfaces of 40 is a return spring 41 which imparts a predetermined elastic force so that the slide core 40 returns to the initial position. Here, the elastic force of the return spring 41 acts to a size such that the slide core 40 can pass the initial position, that is, the position where the angler block 35 is fitted into the guide groove 42 of the slide core 40. The return spring 41 is preferably a compression coil spring.

In addition, a guide groove 42 inclined at a predetermined angle from the center toward the outside is formed on the upper surface of the slide core 40, and the guide groove 42 of the slide core 40 is formed on the lower surface of the fixed template 12. An angler block 45 is mounted to be fitted in a corresponding relationship with each other to selectively move the slide core 40.

On the other hand, the movable template 16 is formed with a reference hole 50 in one of the core mounting holes 17, and the inlet 51 of the reference hole 50 is formed so that its tip gradually narrows. At this time, the reference hole 50 is formed in the initial position of the slide core 40. In addition, a stopper 56 is mounted to the inlet 51 of the reference hole 50 toward the core installation hole 17 so that the spring 55 can be selectively mounted on the stopper 56. It is preferable that it consists of a spherical body. In addition, the stopper 53 is selectively caught on the bottom surface of the slide core 40 so that the position control groove 55 is formed so that the movement of the slide core 40 is restricted, and the position control groove 55 is conical or semi-circular, and the like. It can form suitably in the shape of.

Looking at the operation state of the slide core positioning structure of the mold base according to the present invention as described above, the process of the movable template 16 is moved by the operation of the clamping mechanism described above, that is, the caching of the fixed template 12 In the process of closing the support 13, the angler block 45 of the fixed template 12 is fitted into the guide groove 42 of the slide core 40 in a corresponding relationship with each other, and the movable template 16 moves. Together with the slide core 40 is moved toward the side of the core 18 is combined.

In this state, the spring 52 is maintained in a compressed state by the movement of the slide core 40, the stopper 53 is supported on the lower surface of the slide core 40, the inlet 51 of the reference hole 50 It becomes the state immersed in. The molding material in the molten state is injected from the heating cylinder into a shape in which the cavity 13 and the core 17 of the stationary template 12 are fitted, and the slide core 40 is formed on the side of the core 17 in combination. If desired injection molded product (P) is produced.

On the other hand, in the process of opening the cavity 13 of the stationary template 12 by the movement of the movable template 16 after molding the injection molded product P, the angler from the guide groove 42 of the slide core 40. When the block 45 is pulled out, the slide core 40 is moved away from the side surface of the core 18 by receiving the elastic force of the return spring 41.

When the slide core 40 is moved by the elastic force of the return spring 41 as described above, when the position regulating groove 55 of the slide core 40 coincides with the reference hole 50, the spring 52 The stopper 53 protrudes through the inlet 51 of the reference hole 50 by the elastic force and is fitted in a relationship corresponding to each other in the position regulating groove 55 of the slide core 40 to regulate the movement of the slide core 40. Done.

Therefore, since the initial position of the slide core 40 is precisely regulated by the stopper 53 fitted into the position regulating groove 55, the combination failure of the core 18 and the slide core 40 is improved, and the productivity is remarkably improved. Is improved. For example, since the movement of the slide core 40 is restricted by the stopper 53 while the elastic force of the return spring 41 acts so that the movement of the slide core 40 passes the initial position, the return spring 31 It is possible to accurately set the initial position of the slide core 40 even with the change over time. In addition, the fall of the return spring 41 is effectively prevented, and workability is remarkably improved, such that unnecessary work time due to replacement of the return spring 41 is eliminated.

On the other hand, the above-described embodiment is merely to describe one preferred embodiment of the present invention, the scope of application of the present invention is not limited to such, and can be changed appropriately within the scope of the same idea. For example, the shape and structure of each component specifically shown in the embodiment of the present invention can be modified.

As described above, according to the slide core positioning structure of the mold base according to the present invention, the combination failure of the core and the slide core is eliminated by a simple configuration and structure in which the initial position of the slide core is precisely regulated by the stopper. Not only is it remarkably improved, but also workability is remarkably improved such that unnecessary work time is eliminated.

Claims (1)

A stationary template assembled to have a cavity on one side of the stationary mounting plate, a movable template on which a core assembled to one side of the movable installation plate and fitted into the cavity of the stationary template is installed in a core mounting hole, and the core of the movable template In the mold base having a slide block which is installed in the mounting hole so as to be movable in combination with the core, Between the core 18 and the side surface of the slide core 40 is interposed a return spring 41 for imparting a predetermined elastic force to return the slide core 40 past the initial position, A reference hole 50 is formed in one of the core installation holes 17 so as to have an inlet 51 whose tip is gradually narrowed, A stopper 53 is mounted to the inlet 51 of the reference hole 50 so that the spring 55 can be selectively mounted upon receiving the elastic force of the spring 55 toward the core installation hole 17. The slide core of the mold base, characterized in that the stopper 53 is selectively caught on the lower surface of the slide core 40 so that the position control groove 55 is formed so that the movement of the slide core 40 is restricted at the initial position. Positioning structure.