KR20110133181A - Sprue bush for injection mold - Google Patents

Abstract

PURPOSE: The leading end of the sprue bush is efficiently frozen with the cooling fluid passing through the cyclic type coolant gallery. CONSTITUTION: A sprue bush(41) for injection mold comprises a body(141) and a ring type member(142). A first flow path forming groove(141a) of the ring shape is formed in the outer circumference of the leading end of the body concavely. A second fluid path forming groove(142a) is formed in the inner circumference of the ring type member. The second fluid path forming groove forms a annular cooling passage(14c) with the first flow path forming groove.

Description

Sprue Bushing of Injection Mold {SPRUE BUSH FOR INJECTION MOLD}

The present invention relates to a sprue bush provided with a sprue for guiding molten resin into a cavity of an injection mold.

In general, the injection mold is installed on the upper fixing plate and the lower fixing plate and the upper fixing plate and the lower fixing plate, respectively, and the upper and lower discs, each of which is provided with a molding part for forming a product, are respectively installed on the upper and lower discs and correspond to the molding to be manufactured therebetween. It includes a configuration such as an upper core and a lower core is provided with a cavity of the shape to be.

In addition, a sprue bush provided with a sprue for injecting molten material is installed through the upper fixing plate and the upper disc, and a runner plate is interposed between the upper fixing plate and the upper disc and the upper fixing plate so that the runner is interposed between the runner plate and the upper disc. The upper disc and the upper core are provided with gates, and molten material passes through the sprues, runners, and gates in order to be delivered to the cavity.

One aspect of the present invention is to provide a sprue bush of an injection mold capable of allowing the tip to be cooled efficiently.

The sprue bush of the injection mold according to an aspect of the present invention is a body having a concave annular first flow path forming groove is formed on the outer peripheral surface of the distal end, and an annular annular cooling flow path with the first flow path forming groove on the inner peripheral surface It includes a ring-shaped member provided with a second flow path forming groove.

The body is also provided with a sprue for guiding the molten resin, and the annular cooling flow passage is arranged in the circumferential direction around the sprue.

In addition, the body further includes a pair of straight cooling passages arranged in parallel with the sprue to guide the cooling fluid to the annular cooling passage and to guide the discharge of the cooling fluid passing through the annular cooling passage.

In addition, the ring-shaped member is manufactured separately from the body is coupled to the front end of the body.

In addition, the front end of the body is provided with a seating portion for mounting the ring-shaped member.

In addition, the front end of the body is provided with a seating portion in which the ring-shaped member is formed, the ring-shaped member is molded integrally with the body by melting and laminating metal powder with the seating portion.

As described above, since the annular cooling passage having an annular shape can be formed inside the tip of the sprue bush, the tip of the sprue bush can be cooled efficiently.

1 is a schematic view of an injection mold to which a sprue bush according to an embodiment of the present invention is applied.
Figure 2 is a cross-sectional view of the sprue bush of the injection mold according to an embodiment of the present invention.
3 is a perspective view of a sprue bush of an injection mold according to an embodiment of the present invention.
Figure 4 is a schematic diagram showing a sprue bush manufacturing process of the injection mold according to another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings the sprue bush of the injection mold according to an embodiment of the present invention will be described in detail.

1 shows an injection mold to which a sprue bush according to an embodiment of the present invention is applied.

The injection mold 100 includes an upper fixing plate 10 and a lower fixing plate 20, an upper disc 11 and a lower disc 21 fixed to the upper fixing plate 10 and the lower fixing plate 20, respectively. The upper disc 11 and the lower disc 21 each have an upper core 12 and a lower core 22 to form a cavity C having a shape corresponding to that of the injection product to be manufactured through the injection mold 100, respectively. Is installed.

The upper core 12 is provided with an upper molding surface 12a having a shape corresponding to the upper surface of the injection product to be manufactured, and the lower core 22 is provided with a lower molding surface 22a having a shape corresponding to the lower surface of the injection product to be manufactured. The above-mentioned cavity C is provided by the upper shaping | molding surface 12a and the lower shaping | molding surface 22a.

A runner plate 13 for forming a runner 11a is disposed between the upper fixing plate 10 and the upper disc 11, and molten resin may be supplied to the upper fixing plate 10 and the runner plate 13 by the runner 11a. The sprue bush 14 is installed through the upper fixing plate 10 and the runner plate 13 so that the sprue bush 14 can be installed. In this embodiment, the runner 11a is recessed in the upper surface of the upper disc 11.

In addition, the upper disc 11 and the upper core 12 are provided with a gate 12b connected to the runner 11a to guide the molten material transferred through the runner 11a into the cavity C. Therefore, the molten material passes through the sprue 14a, the runner 11a, and the gate 12b in order to be transferred to the cavity C.

2 and 3, the sprue bush 14 receives the molten material from the outside and is connected to the runner 11a to guide the sputtered molten material to the runner 11a as shown in FIGS. 2 and 3. 14a is provided to penetrate the center of the sprue bush 14, and the sprue bush 14 is guided to the outside of the sprue 14a of the sprue bush 14 so that a cooling fluid such as water flows. Cooling passages 14b and 14c are provided, respectively, to allow cooling.

The cooling passages 14b and 14c are formed in a straight line shape so that they can be easily manufactured by mechanical processing methods, and the pair of linear cooling passages 14b and the runner 11a provided alongside the sprue 14a. It includes an annular cooling passage 14c formed in an annular shape inside the tip end of the sprue bush 14 disposed toward. At this time, one end of the two straight cooling passages 14b is connected through a cooling device (not shown) provided at the outside of the injection mold 100 and a flow path, and the other end of the two straight cooling passages 14b is connected to the annular cooling passage 14c. Connected to both sides, the cooling fluid supplied from the cooling device through either one of the two linear cooling passages 14b is supplied to the annular cooling passage 14c and the annular cooling passage through the other linear cooling passage 14b ( The refrigerant passing through 14c) is recovered to the cooling device.

In order to form the annular cooling passage 14c as described above, the sprue bush 14 is disposed at the front end side of the body 141 provided with the sprue 14a and the body 141 and annular together with the body 141. And a ring-shaped member 142 forming the cooling passage 14c.

The body 141 is provided with a sprue 14a at the center thereof, and two straight cooling passages 14b are provided side by side on both outer sides thereof. An annular first flow path forming groove 141a connected to one end of the linear cooling flow passage 14b is concave on the tip outer peripheral surface of the body 141. In addition, the body 141 is provided with a seating portion 141b on which the ring-shaped member 142 is mounted on the outer side of the first flow path forming groove 141a.

The ring-shaped member 142 is formed in an annular shape, and the second flow path forming groove 142a forming the annular cooling passage 14c together with the first flow path forming groove 141a is provided in the annular concave shape. When one end of the ring-shaped member 142 formed as described above is fixedly coupled to the seating portion 141b by the first flow path forming groove 141a of the body 141 and the second flow path forming groove 142a of the ring-shaped member 142. An annular cooling passage 14c is formed at the tip of the sprue bush 14. In this embodiment, the ring-shaped member 142 is manufactured separately from the body 141, and then coupled to the seating portion 141b of the body 141 through various coupling methods such as welding.

When the annular cooling passage 14c is formed in an annular shape inside the distal end of the sprue bush 14 as described above, the cooling fluid flows into the annular cooling passage 14c through the one-sided linear cooling passage 14b and then annularly. After cooling the distal end of the sprue bush 14 while moving in the circumferential direction along the cooling passage 14c, it is discharged through the other straight cooling passage 14b. Therefore, the tip of the sprue bush 14 is efficiently cooled by the cooling fluid passing through the annular cooling passage 14c.

In the above embodiment, the sprue bush 14 of the injection mold 100 manufactures the ring-shaped member 142 separately from the body 141, and then mounts the ring-shaped member 142 to the body 141 by welding or the like. The annular cooling passage 14c is formed to be coupled to the portion 141b, but is not limited thereto. As shown in FIG. 4, the body 141 is manufactured, and a seating portion of the manufactured body 141 is formed. After the metal powder (P) is disposed on the 141b, the metal powder (P) placed on the seating portion (141b) is dissolved and gradually laminated by the laser generated by the laser generator (L), thereby ring-shaped member It is also possible that the 142 is formed integrally with the body 141.

It is apparent to those skilled in the art that the present invention is not limited to the above-described embodiments, and that various modifications and variations can be made without departing from the spirit and scope of the present invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

100: injection mold 10: upper fixing plate
11: upper disc 11a: runner
12: upper core 13: runner plate
14: Sprue Bush 14a: Sprue
14b: straight cooling passage 14c: annular cooling passage
141: body 141a: first flow path forming groove
141b: seating portion 142: ring-shaped member
142a: second flow path forming groove C: cavity

Claims (6)

A body having a concave annular first flow path forming groove formed on the outer peripheral surface of the tip;
A sprue bush of an injection mold, including a ring-shaped member having an inner circumferential surface and a second flow path forming groove for forming an annular annular cooling flow path together with the first flow path forming groove. The method of claim 1,
The body is provided with a sprue for guiding the molten resin,
The annular cooling passage is a sprue bush of an injection mold disposed in the circumferential direction around the sprue. The method of claim 2,
The body is arranged side by side with the sprue is a sprue bush of the injection mold further comprises a pair of linear cooling passages for guiding the cooling fluid to the annular cooling passage and the discharge of the cooling fluid passing through the annular cooling passage. . The method of claim 1,
The ring-shaped member is manufactured separately from the body sprue bush of the injection mold coupled to the front end of the body. The method of claim 4, wherein
Sprue bushing of the injection mold is provided on the front end of the body is provided with a seating portion for mounting the ring-shaped member. The method of claim 1,
The front end of the body is provided with a seating portion in which the ring-shaped member is formed,
The ring-shaped member is a sprue bush of an injection mold which is integrally formed with the body by melting and laminating metal powder with the mounting part by laser.

Images