KR100229127B1 - Runner separation apparatus for resin molding molder - Google Patents

Abstract

The present invention relates to a runner separation device of a mold for resin molding, and more specifically, by simply mounting on a fixed side mounting plate of the mold, the runner, sprue, and gate simultaneously with opening of the mold without using a separate runner plate. The present invention relates to a runner separator of a mold for molding a resin, which can be automatically separated from a molded article.

The runner separator of the resin molding die according to the present invention comprises a cylindrical body; A cap coupled to the top of the body; An undercut for fixing the runner at a lower end thereof, the runner locking pin being installed in a longitudinal direction at the center of the fuselage; A runner ejector on a sleeve installed at an outer circumference of the runner lock pin; A ballistic means provided between the cap and the runner ejector to apply elasticity such that the runner ejector protrudes outward from the lower opening of the body; After the external force applied to the lower surface of the fuselage is removed, characterized in that it comprises a runner ejector operation delay means for delaying the projecting operation of the ejector by the elastic force of the elastic means for a predetermined time.

Description

Runner Separation Device of Resin Mold

1 is a cross-sectional view of an essential part of a conventional runner separation device.

2 is an exploded perspective view of the runner separator according to one embodiment of the present invention.

Figure 3 (a) to (c) is a cross-sectional view according to each operating state of the runner separation device according to an embodiment of the present invention.

4 is a state in which the runner separator is mounted on the fixed side mounting plate of the mold.

5 (a) and 5 (b) show another embodiment of the present invention.

6 and 7 show yet another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: fuselage 2: cap

3: runner lock pin 4: runner ejector

5: spring 7: working delay sleeve

151: fixed side template 153: fixed side mounting plate

The present invention relates to a runner separation device for a resin molding mold, and more particularly, by simply mounting on a fixed side mounting plate of a mold, the runner, sprue, and gate simultaneously with opening of the mold without using a separate runner plate. The present invention relates to a runner separator of a mold for molding a resin, which can be automatically separated from a molded article.

In general, in a mold for molding a resin, such as an injection molding mold, the molten material is injected into the cavity of the mold, which is a product molding space, through an injection space such as a sprue, a runner, and a gate, so that the molded article is not required to correspond to the injection space. A molded article (hereinafter referred to as a runner) is integrally molded.

Therefore, the runner should be separated from the molded product after the molding is completed.The method is to discharge the molded product from the mold, and to cut the runner using a tool such as a nipper or a separate separation device, and to open the mold at the same time as the mold is opened. Since there is a method of automatically separating from the former method, the latter method is generally used because the former method is cumbersome and the cutting edge is not clean.

1 is a cross-sectional view of an essential part for explaining an example of a conventional runner separation device formed to automatically separate a runner from a molded product at the same time as a mold opening, wherein the runner separation device includes a fixed side mold plate 151 and a fixed side mounting plate 153. The runner plate 171 is installed between the) and the undercut 173 for fixing the runner 181 to the front end is formed, and the fixed side mounting plate 153 to protrude through the runner plate 171 to protrude into the runner portion. It consists of a runner lock pin 172 fixed to the stop bolt 174 penetrating the fixed side mounting plate 153 and the runner plate 171 to the three-stage rod 156, sprues for guiding the molten material The bush 157 is installed to penetrate the runner plate 171 and be connected to the runner 181.

Reference numeral 159 denotes a guide pin, 160 denotes an ejector pin, and 161 denotes a return pin.

Referring to the operation of the conventional runner separation device configured as described above according to the operating step of the mold as follows.

FIG. 1 (a) shows a state in which the mold is closed, and the molten material passes through the sprue 183, the runner 181, and the gate 182, and the fixed side template 151 and the movable side template ( Filled in the cavity 184 formed by 152 is solidified by cooling for a period of time. The process runner 181 is fixed to the undercut 173 portion of the tip of the runner lock pin 172.

When the movable side mounting plate 154 starts to operate to open the mold after the cooling solidification of the molten material is completed, the fixed side template 151 and the movable side template 152 as shown in FIG. 1 (b). ) And the spacer block 155 move together with the movable side mounting plate 154 in the direction of the arrow, so that the runner plate 171 and the fixed side template 151 are opened. At this time, since the runner 181 is fixed to the undercut 173 portion of the tip of the runner lock pin 172, the gate portion C having a weaker strength is cut. That is, the runner 181 is separated from the molded article in the cavity 184 and remains on the runner plate 171 side.

When the movable side mounting plate 154 continues to operate so that the divided surface 151 'of the fixed side template 151 contacts the flan surface 156' below the three-stage rod 156, the three-stage rod 156 and the three-stage rod 156 Since the stop bolt 174 which is fastened to the side is moved, the runner plate 171 starts to be separated from the fixed side mounting plate 153. The runner plate 171 is operated until the flange surface 174 'of the stop bolt 174 touches the stop portion 153' of the fixed side mounting plate 153, as shown in FIG. As a result, the runner separation process is completed by separating the runner 181 from the undercut 173 of the runner lock pin 172.

However, in the conventional runner separation device as described above, since the runner plate must be additionally installed, the size of the mold is increased, and parts such as a three-stage rod, a stop bolt, etc. are added to move the runner plate, and these are installed in the mold. In order to process the installation hole on each plate of the mold, it is difficult to design and manufacture the cooling water passage, and there is a problem that the overall manufacturing process is complicated and the cost increases, and the sprue is long as it corresponds to the thickness of the runner plate. As a result, the loss of molding material was not negligible.

In addition, even after the runner is separated from the undercut of the runner lock pin, the runner and the sprue are often attached to the runner plate and the sprue bush, so the separation work is not easy. There was also a problem that must be installed.

Accordingly, the present invention has been made to solve such a conventional problem, and by simply mounting the fixed side mounting plate of the mold, it is possible to reliably separate the runner from the molded product simultaneously with opening of the mold without using a separate runner plate. The object is to provide a runner separation device for a resin molding die.

The runner separator of the resin molding die according to the present invention for achieving the above object is a cylindrical body; A cap coupled to the top of the body; An undercut for fixing the runner at a lower end thereof, the runner locking pin being installed in a longitudinal direction at the center of the fuselage; A runner ejector on a sleeve installed at an outer circumference of the runner lock pin; A cartilage means mounted between the cap and the runner ejector to apply a force to the runner ejector so as to protrude outside the lower end of the fuselage; After the external force applied to the lower surface of the fuselage is removed, characterized in that it comprises a runner ejector operation delay means for delaying the projecting operation of the ejector by the elastic force of the elastic means for a predetermined time.

The runner separator of the present invention is used by being fixed to the fixed side mounting plate of the resin molding die, and after cooling solidification of the molten material is completed during the molding operation, the runner is fixed to the undercut of the runner lock pin. When the fixed side template starts to open, the runner ejector which separates the runner from the undercut by the spring force is delayed for a certain time by the runner ejector delaying means, so that the runner is firmly fixed to the undercut area. The weaker gate area is first separated from the molded article. Thereafter, the runner ejector is operated to separate the runner from the undercut, thereby completing the runner separation operation.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 and 3 are views for explaining the configuration and operation of the runner separation device of an embodiment of the present invention, Figure 2 is an exploded perspective view of the runner separation device, Figure 3 (a) to (c) is a runner separation device The cross-sectional view of each operating state is shown.

The runner separating device of the present embodiment includes a body 1, a cap 2 screwed to an upper portion of the body 1, a runner lock pin support 6 screwed to a lower portion of the cap 2, and a runner lock pin. (3), a runner ejector 4 on the sleeve provided on the outer periphery of the runner lock pin and a spring 5 provided between the cap 2 and the runner ejector 4;

The body 1 is formed in a cylindrical shape with both ends opened, and a flange 11 for restricting the operation of the runner ejector is formed at a lower end thereof, and a protrusion 12 having a predetermined width is formed in a ring shape on an inner surface thereof. In addition, the upper end is machined to the oil ring 91 installation portion and the screw portion is fastened to the cap (2).

The cap 2 is fastened to the body 1 to form an exterior of the runner separation device. A cylindrical guide portion 22 is integrally formed at the lower part of the body 21, and the runner ejector 4 is formed on the outer circumferential surface thereof. It is slidably fitted, and a spring 5 is settled inside, and a screw hole 23 and a runner lock pin support for fixing the device to the fixed side mounting plate of the mold are provided on the upper and lower portions of the body 21. (6) Tightening screw holes are formed respectively. O-ring grooves for installing the O-rings 91 and 92, threaded portions for fastening with the fuselage 1, and oil grooves 24 for preventing the flow of oil are formed on the outer circumference of the cap 2, respectively.

The runner lock pin support 6 is fastened to the lower portion of the body 21 of the cap 2 while supporting the runner lock pin 3, and the engaging portion 61 is provided at the lower opening of the runner lock pin support 6. Is formed, and the locking portion supports the runner lock pin 3 in a longitudinal direction by a predetermined distance by limiting the movement of the flange portion 32 of the runner lock pin 3.

During the molding operation, the runner 181 is fixed to the runner lock pin 3, and an undercut 31 is formed at one end of the runner lock pin 3 so that the runner is firmly fixed and the flange portion ( 32) is formed.

The runner ejector 4 is slidably installed on the outer side of the runner lock pin 3 to protrude below the undercut 31 of the runner lock pin 3 to undercut the runner fixed to the undercut 31. In the outer circumference, an o-ring groove for installing the protrusion 42 and the o-ring 93 having the inclined surface 43 is formed on the outer circumference thereof.

A spring 5 is installed between the cap 2 and the runner ejector 4 so that the downward ejection force on the runner ejector 4, that is, the runner ejector 4, is below the undercut 31 of the runner lock pin 3. It will give you an elastic force to protrude.

The spaces A and B formed between the body 1 and the runner ejector 4 are filled with a fluid, preferably hydraulic oil. Since the oil flows only through the gap between the body 2 and the projections 12 and 42 of the runner ejector 4 until the runner ejector 4 moves by a predetermined distance, the runner ejector 4 moves. It acts as a resistor that delays for a predetermined time.

The operation and action of the runner separation device configured as in the above embodiment will be described with reference to FIGS. 3 and 4 as follows.

4 shows the state where the runner separating device is mounted on the fixed side mounting plate of the mold, and FIGS. 3A to 3C show the respective operating states of the runner separating device according to the operation of the mold.

The runner separating apparatus of the present invention is simply mounted by processing an installation hole in the fixed side mounting plate 153, press-fitting the runner separation device to this installation hole, and fixing it with the fixing bolt 94.

FIG. 3 (a) shows the operating state of the runner separating device when the mold is closed. As shown in FIG. 3 (c), the elastic force of the spring 5 is lowered to the lower part of the fuselage 1. The protruding runner ejector 4 compresses the spring 5 as the fixed side mounting plate 153 and the fixed side template 151 approach and is pushed into the fuselage 1, and the runner lock pin 3 ) Is pushed up like the runner ejector 4 by the frictional force with the runner ejector 4. At this time, since the flow amount of the oil is gradually reduced due to the inclined surface 43 formed on the protrusion 42 of the runner ejector 4, the resistance of the oil to the upward movement of the runner ejector 4 is also gradually increased. Impact load on the mold drive system can be reduced.

Runner while the molten material is filled in the cavity 184 formed by the fixed side template 151 and the movable side template 152 by sprues, runners, and gates while the mold is closed and cooled for a predetermined time. 181 is fixed to the portion of the undercut 31 at the tip of the runner lock pin 3.

When the fixed side mounting plate 153 and the fixed side template 151 start to open after the cooling solidification of the molten material is completed, the runner ejector 4 tries to protrude below the fuselage 1 by the spring force of the spring. Since the oil of B flows into the space A only through the gap between the protrusions 12 and 14, the protruding operation is delayed, and the runner lock pins fixed to the runner 181 as shown in FIG. 3) first protrudes a distance L. At this time, since the runner 181 is integrated with the molded article in the cavity 184 through the gate, the distance L between the runner 181 and the lower surface of the fixed side mounting plate 153 as the fixed side template 151 moves. As much as That is, the separation operation from the fixed side mounting plate 153 of the runner 181 is performed first. This is to provide a stronger impact force when the runner ejector 4 is later protruded to separate the runner 181 from the undercut 31.

When the fixed side mounting plate 153 and the fixed side template 151 are further opened in the state of FIG. 3 (b), the runner 181 is firmly fixed to the undercut 31 of the runner lock pin 3. The connection between the molded part and the gate that is weaker than this is broken. That is, the separating operation of the runner and the molded product is made.

When the fixed side mounting plate 153 and the fixed side template 151 are further opened after the separation operation of the runner and the molded product is made, as shown in FIG. The runner ejector 4 is strongly advanced to separate the runner 181 from the undercut 31 of the runner ejector pins 3, thereby completing the runner separation operation, and the runner ejector 4 gradually moves forward. Continued, the projection 42 of the runner ejector is made out of the projection 12 of the fuselage, and the oil flow is made free.

5 (a) and (b) show another embodiment of the present invention, the embodiment of FIG. 5 (a) omits the runner lock pin support 6 in the previous embodiment, The support hole 24 is formed in the cap 2, and the flange 32 of the runner lock pin 3 is limited by the upper end of the spring 5.

The embodiment of FIG. 5 (b) does not form a separate projection in the runner ejector 4 or the fuselage 1, so that the oil flow between the spaces A and B is between the runner ejector 4 and the fuselage 1 Since the progression is continued little by little through the gap of the runner lock pin (3) of the runner from the undercut 31 is also gradually progressed. The oil flow amount can be adjusted by providing a separate oil flow groove in the longitudinal direction on the outer circumference of the runner ejector 4 or the inner circumference of the body 1. In this embodiment, the thread part 33 is formed on the upper part of the runner lock pin 3, and the runner lock pin 3 is fixed to the lower part of the cap 2.

The embodiment of FIG. 5 shows that when the fixed side mounting plate and the fixed side template of the mold are opened after the molding is completed, the protrusion operation of the runner ejector 4 to the lower part of the undercut 31 of the runner lock pin 3 is prevented. Delayed by a certain time by the flow resistance of the molded article and the runner is separated first, the undercut and the runner is the same principle as the above-described embodiment, so the detailed description of the operation is omitted.

6 and 7 are views for explaining another embodiment of the present invention, the runner separation device of the present embodiment is to achieve the operation delay of the runner ejector by the flow resistance of oil as in the above-described embodiment. Rather, it is achieved by a separate operational delay sleeve.

Hereinafter, while describing the present embodiment, those having the same functions as the embodiments shown in FIGS. 1 to 5 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The flange 11 is formed in the lower end of the fuselage 1 of the runner separation apparatus, and the thread part for engagement with the cap 2 is formed in the inner surface of the other end. The cap 2 is formed in a cylindrical shape, the upper surface of which is formed with a runner lock pin through hole 24, a flange seat 25 and a screw hole 23, respectively, and a lower outer periphery of the cap 1 The threaded part is formed. An undercut 31 is formed at one end of the runner lock pin 3 and a flange 32 is formed at the other end thereof, so that when the runner separator of the present embodiment is mounted on the fixed side mounting plate of the mold, The flange 32 of the runner lock pin is fitted between the flange seats 25 to be fixed.

On the outer circumference of the runner lock pin 3, a runner ejector 4 on the sleeve in which the projection 42 is formed in the middle of the outer circumference is slidably installed, and the lower part of the projection 42 of the runner ejector 4 and the body ( An operating delay sleeve 7 is provided between the flanges 11 of 1).

do.

7 (a) and 7 (b) are perspective views showing the shape of the operation delay sleeve 7 and the positional relationship with the runner, and the bottom view of the operation delay sleeve, wherein the operation delay sleeve 7 is a cylindrical body 71. A flange 72 having a guide protrusion 73 is formed at an upper portion thereof, and a locking jaw 74 is formed at an inner circumference thereof to catch the protrusion 42 of the runner ejector, and a lower portion of the body 71 is a space portion. The operation delay piece 76 protrudes so that the runner bypass portion 75 is formed. The guide protrusion 73 is slidably fitted into a guide groove (not shown) formed in the longitudinal direction on the inner wall surface of the body 1 so that the runner bypass portion 75 when the operation delay sleeve 7 protrudes. It is always positioned above the length of the runner 181.

The operation delay sleeve 7 may be formed by forming grooves in the longitudinal direction on both inner wall surfaces of the body 1 and providing an operation delay piece of a divided form in each groove.

A spring 5 is installed between the cap 2 and the actuation delay sleeve 7 via a washer 8 to exert an elastic force on the actuation delay sleeve 7 and the runner ejector 4.

Referring to Figure 6 (a) to (c) the operation of the runner separation device according to this embodiment configured as described above is as follows.

FIG. 6 (a) shows the operating state of the runner separation device when the mold is closed. As shown in FIG. 6 (c), the elastic body of the spring 5 is moved to the lower end of the fuselage 1 as shown in FIG. The protruding runner ejector 4 and the operation delay sleeve 7 compress the spring 5 as the fixed side mounting plate and the fixed side template of the mold approaches, and are pushed into the fuselage 1 so that the mold is closed. When it is closed, it will be in the state of FIG.

When the cooling solidification of the molten material is completed and the runner 181 is fixed to the portion of the undercut 31 at the tip of the runner lock pin 3, the fixed side mounting plate and the fixed side template start to open. The force is applied to the top of the flange 12 of the actuation delay sleeve 7 via the washer 8. Thus, the actuation retardation piece 76 of the actuation retardation sleeve 7 protrudes to the lower part of the body 1 in contact with the upper surface of the stationary side template, so that the state of FIG. The lower surface of 8) comes into contact with the protrusion 42 of the runner ejector 4.

During this process, the runner 181 passes through the runner bypass portion 75 between the operation delay pieces 76, as shown in FIG. Regardless of the protruding operation, the state in which the fastener is firmly fixed to the undercut 31 of the runner lock pin 3 is maintained, and thus, the connection portion between the molded part and the gate having a weaker strength is broken. That is, the separating operation of the runner and the molded product is made.

In this state, when the distance between the fixed side mounting plate and the fixed side template increases, the spring force of the spring simultaneously with the projection 42 of the operation delay sleeve 7 and the runner ejector 4 via the washer 8 Will be added. That is, since the runner ejector 4 protrudes below the undercut 31 of the runner lock pin, the runner separation operation is completed by separating the runner 181 from the undercut 31 of the runner ejector pin 3.

As described above, according to the runner separating apparatus according to the present invention, by simply mounting on the fixed side mounting plate of the mold, the runner, sprue, and gate can be removed from the molded article simultaneously with opening of the mold without using a separate runner plate. Automatically and reliably separated, and accordingly, separate parts such as three-stage rod, stop bolt, etc. for the operation of the existing runner plate can be omitted, and the installation hole is machined in each plate of the mold to install them in the mold This eliminates the difficulties in designing the cooling water passage and making the mold. In addition, there is an effect that can simplify the overall manufacturing process of the mold and at the same time reduce the production cost.

Since the above-described embodiments are merely exemplary embodiments of the present invention, various modifications or changes are possible within the spirit and scope of the present invention as specified in the claims. For example, one of ordinary skill in the art can install a part of the parts shown in the above embodiment in the mold main body, electronically realize the operation and delay of the runner ejector, or change the shape or arrangement of the parts. The present invention may be modified or changed very easily, for example, by changing.

Claims (7)

Cylindrical body; A cap coupled to the top of the body; An undercut for fixing the runner at a lower end thereof, the runner locking pin being installed in a longitudinal direction at the center of the fuselage; A runner ejector on a sleeve installed at an outer circumference of the runner lock pin; A ballistic means provided between the cap and the runner ejector to apply elasticity such that the runner ejector protrudes outward from the lower opening of the body; Runner separation of the mold for molding a resin, characterized in that the runner ejector operation delay means for delaying the ejection operation of the ejector by the elastic force of the carbushing means for a predetermined time after the external force applied to the bottom surface of the fuselage is removed. Device. The runner separation apparatus of the mold for molding a resin according to claim 1, wherein the runner ejector operation delaying means is a fluid filled between the fuselage and the runner ejector so as to prevent movement of the runner ejector by flow resistance. 3. The runner separator of a mold for molding a resin according to claim 2, wherein the fluid is hydraulic oil. 3. A ring-shaped protrusion is formed on the inner wall of the fuselage and the outer wall of the runner ejector, respectively, to prevent movement of the runner ejector by the flow resistance while the fluid flows through the gap between the protrusions. A runner separation device for a resin molding die, characterized in that. 5. The runner separator of a resin molding die according to claim 4, wherein an inclined portion is integrally formed on an upper portion of the protrusion formed on an outer wall of the runner ejector. The operation delay sleeve according to claim 1, wherein a runner ejector operation delay means is provided between the fuselage and the runner ejector to receive a resilience force of the carcass means prior to the runner ejector and protrude out of the fuselage before the runner ejector. The runner separator of the mold for resin molding characterized by the above-mentioned. The runner separation device of a mold for molding a resin according to claim 1 or 6, wherein the runner lock pin is provided in the body so as to flow a predetermined distance in a longitudinal direction.