WO2008038694A1

WO2008038694A1 - Sprue bush and its production method

Info

Publication number: WO2008038694A1
Application number: PCT/JP2007/068764
Authority: WO
Inventors: Yasushi Furukawa; Kazuho Morimoto
Original assignee: Ngk Insulators, Ltd.; Opm Laboratory Co., Ltd.; Ngk Fine Molds, Inc.
Priority date: 2006-09-27
Filing date: 2007-09-27
Publication date: 2008-04-03
Also published as: TW200835588A; KR101425691B1; CN101535026A; TWI410319B; KR20090091110A; CN101535026B; JP5001289B2; JPWO2008038694A1

Abstract

A sprue bush (10), incorporating in its body a sprue (12) having an injection port (11) formed, at one end hereof, to be coupled with the injection port of an injection molding machine and a discharge port (13) formed, at the other end hereof, to be coupled with the cavity of a die when it is fixed to the die, comprises a cylindrical sprue bush body (61) having body water channels (14a, 14b, 14c) buried in a part of the region excepting the sprue (12), and a flange portion (60) expanding from the injection port (11) side of the sprue bush body (61) to be connected with the sprue bush body (61) and having flange portion water channels (15a, 15b) buried therein that are continuous from the body water channels (14a, 14b, 14c) and communicate with the outside. With such a sprue bush (10), molten material filling the sprue (12) is cooled efficiently, and deterioration in quality of a molding can be suppressed.

Description

Specification

Sprue bushing and manufacturing method thereof

Technical field

The present invention relates to a sprue bush and a method for manufacturing the same.

Background art

[0002] Conventionally, injection molding for molding a product by injecting a material melted by heating (hereinafter referred to as a molten material) into a mold is generally widely known.

[0003] Specifically, a mold used for injection molding has a sprue bush that is pressed against an injection port portion of an injection molding machine that injects a molten material, and a shape portion for forming a molded product. The mold has a sprue bush having a sprue that is a space into which the molten material is injected, a cavity that is a space that is filled with the molten material, and a runner that is a flow path of the molten material. Sprue and cavity are connected through the runner.

[0004] In such an injection mold, after the molten material filled in the cavity is sufficiently cooled and solidified, the molded product is taken out from the cavity. At that time, the molded product is taken out after the molten material filled in the sprue and the runner is sufficiently cooled and solidified to prevent the material from remaining in the sprue and the runner.

[0005] Generally, the volume per unit area is larger for sprues and runners than for cavity. Therefore, the time required for the molten material filled in the sprue or runner to harden is longer than the time required for the molten material filled in the cavity to harden. For this reason, shortening the time required for the molten material filled in the sprue or runner to harden contributes to the improvement of production efficiency.

[0006] On the other hand, by forming a flow path of cooling water in a member forming the runner or the like, the time required for the molten material filled in the runner or the like to solidify is reduced. Injection A molding die has been proposed (for example, Patent Document 1).

[0007] Here, when the sprue bushing (hereinafter referred to as a sprue bushing or the like) that forms the runner is cooled with cooling water, the sprue bushing or the like is cooled inside the sprue bushing or the like in order to increase the cooling efficiency. Preferable to form a water flow path. [0008] On the other hand, in order to circulate the cooling water in the flow path of the cooling water, a water supply port for supplying the cooling water and a drain port for discharging the cooling water are required. In addition, the water supply port and the drain port need to connect the flow path of the cooling water formed inside the sprue bush and the outside of the spruce bush.

[0009] However, since the water supply port and the drain port communicate with the outside of the sprue bushing! /, The cooling water supplied from the water supply port and the drainage water supply water are supplied to the outer surface of the sprue bushing. May leak along. In this way, if cooling water that leaks along the outer surface of the sprue bushing enters the runner or cavity, the quality of the molded product will deteriorate.

Patent Document 1: Japanese Patent Laid-Open No. 2002-18909 (Claim 1, FIG. 2, etc.)

Disclosure of the invention

[0010] The present invention has been made to solve the above-described problems, and it is possible to efficiently cool the molten material filled in the sprue and to suppress the quality deterioration of the molded product. An object of the present invention is to provide a sprue bushing and a manufacturing method thereof.

[0011] (Means for solving the problem)

The first feature of the present invention is that the inlet is formed to be connectable to the injection port of the injection molding machine at one end, and the discharge is formed to be connectable to the mold cavity when attached to the mold at the other end. A sprue with a mouth is provided inside the main body, and a cylindrical sprue bushing body with a main body water channel embedded in a part of the area excluding the sprue is projected from the inlet side end of the sprue bushing body and connected to the sprue bushing body. The sprue bush is provided with a flange portion in which a flange portion water passage continuing to the main body water passage and leading to the outside is embedded.

[0012] A second feature of the present invention is that a metal powder is applied, and a hollow substantially conical sprue having a diameter increasing toward the other end of the molten material in the flow direction is provided inside the main body. One end on the small diameter side of the sprue is formed so that it can be connected to the injection port of the injection molding machine, and the other end on the large diameter side of the sprue is connected to the mold cavity when attached to the mold. A cylindrical sprue bushing body that is formed and has a body channel embedded in the part of the area excluding the sprue so that it surrounds the sprue on the sprue outlet side. Connected to the main body, the main body water A sprue bush with a flange section where the flange section is embedded so that it continues to the outside and is connected to the outside, and a water supply port and a drain outlet are provided on the supported surface when attached to the mold. Based on the pattern of the cross-sectional shape obtained by directing in the flow direction of the molten material, the part corresponding to the sprue, main body water channel, flanged water channel, water supply port and drain port is removed, and the metal powder is irradiated with laser light. The gist of the present invention is a sprue bushing manufacturing method including: a step of performing heat processing according to the above and further stacking and stacking to form a three-dimensional shape; and a step of cutting into a three-dimensional shape.

Brief Description of Drawings

FIG. 1 is a perspective view of a sprue bushing 10 according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the configuration of the sprue bushing 10 according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view showing the configuration of the sprue bushing 10 according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view for explaining assembly of the sprue bushing 10 according to the first embodiment of the present invention.

FIG. 5 is a flowchart showing a method for manufacturing the sprue bushing 10 according to the first embodiment of the present invention.

FIG. 6 is a manufacturing process diagram (manufacturing apparatus schematic diagram) of the sprue bushing 10 according to the first embodiment of the present invention.

FIG. 7 is a manufacturing process diagram (manufacturing apparatus schematic diagram) of the sprue bushing 10 according to the first embodiment of the present invention.

FIG. 8 is a manufacturing process diagram of the sprue bushing 10 according to the first embodiment of the present invention.

FIG. 9 is a manufacturing process diagram of the sprue bushing 10 according to the first embodiment of the present invention ((a) top view,

(b) sectional view).

FIG. 10 is a manufacturing process diagram of the sprue bushing 10 according to the first embodiment of the present invention ((a) top view, (b) cross-sectional view).

FIG. 11 is a manufacturing process diagram of the sprue bushing 10 according to the first embodiment of the present invention ((a) top view, (b) cross-sectional view).

FIG. 12 is a manufacturing process diagram ((a) top view, (b) sectional view) of the sprue bushing 10 according to the first embodiment of the present invention. FIG. 13 is a manufacturing process diagram ((a) top view (b) sectional view) of the sprue bushing 10 according to the first embodiment of the present invention.

FIG. 14 is a view for explaining the method of manufacturing the sprue bushing 10 according to the first embodiment of the present invention.

FIG. 15 is a cross-sectional view of the sprue bushing 10 according to the first embodiment of the present invention.

FIG. 16 is a cross-sectional view of the sprue bushing 10 according to the first embodiment of the present invention.

FIG. 17 is a cross-sectional view of the sprue bushing 10 according to the first embodiment of the present invention.

FIG. 18 is a cross-sectional view of the sprue bushing 10 according to the first embodiment of the present invention.

FIG. 19 is a cross-sectional view of the sprue bushing 10 according to the first embodiment of the present invention.

FIG. 20 is a perspective view of a sprue bushing 10 according to a second embodiment of the present invention.

FIG. 21 is a cross-sectional view showing a configuration of a sprue bushing 10 according to a second embodiment of the present invention.

FIG. 22 is a perspective view of a sprue bushing 10 according to a third embodiment of the present invention.

FIG. 23 is a cross-sectional view showing a configuration of a sprue bushing 10 according to a third embodiment of the present invention.

FIG. 24 is a cross-sectional view showing a configuration of a sprue bushing 10 according to a third embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, sprue bushings according to embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the embodiments. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals, and description thereof is omitted. Also, it should be noted that the drawings are schematic, and the ratio of each dimension is different from the actual one. Therefore, specific dimensions should be determined in consideration of the following explanation. In addition, it goes without saying that portions with different dimensional relationships and ratios are included in the drawings. In FIG. 1, from the viewpoint of clarifying the arrangement relationship inside the sprue bushing 10, the sprue 12, the main body waterway 14a 14b 14c, the flange part waterway 15a 15b, the water supply port 16a, and the drainage port 16b are shown by solid lines, and the sprue bushing The main body 61 and the flange section 60 are indicated by a two-dot chain line. 20 and 24 are the same as those in FIG. [0015] [First embodiment]

[0016] As shown in FIG. 1, the sprue bushing 10 according to the first embodiment is provided with a hollow substantially conical sprue 12 having a diameter increasing from one end to the other end in the flow direction of the molten material. The sprue 12 has one end on the small diameter side that can be connected to the injection port of the injection molding machine, and the other end on the large diameter side of the sprue 12 is connected to the mold cavity when attached to the mold. A cylindrical sprue in which the main body water channels 14a, 14b, and 14c are embedded in the part of the area excluding the sprue 12 so as to surround the sprue 12 on the side of the outlet 13 of the sprue 12 Bush body 61,

The sprue bushing body 61 extends from the inlet 11 side end and is connected to the sprue bushing body 61. The flange section waterways 15a and 15b are embedded in the mold so as to continue to the body waterways 14a, 14b, and 14c and to the outside. And a flanged portion 60 provided with a water supply port 16a and a drainage port 16b continuous to the flanged water channels 15a and 15b on the supported surface.

As shown in FIG. 2, the main body water channel 14 includes a first main body water channel 14a, a second main body water channel 14b, and a third main body water channel 14c. The first main body water channel 14a and the second main body water channel 14b are formed in parallel to the central axis of the sprue 12 in the flow direction of the molten material. As shown in Fig. 3 (a), one end of the first main body water channel 14a and the second main body water channel 14b is connected to the water supply port 16a or the water discharge port 16b via the flange part water channels 15a and 15b, respectively. . As shown in FIG. 3 (b), the other ends of the first main body water channel 14a and the second main body water channel 14b are formed to surround the sprue 12 on the sprue outlet 16b side. Are connected to each other through main channel 14c.

[0018] As shown in Fig. 3 (a), at least a part of the flange section water passage 15a is formed in the flange portion 60 (flange portion 60a). In addition, the water supply port 16a provided in the supported surface 10b and the main body water channel 14a are connected via a flanged water channel 15a. On the other hand, at least a part of the flange section water channel 15b is formed in the flange portion 60 (flange portion 60b). Further, the drainage port 16b provided in the supported surface 10c and the main body waterway 14b are connected via the flange section waterway 15b!

[0019] As shown in FIG. 3 (b), the main body water channel 14c includes a main body portion 61 (the main body portion 61a and the main body portion). 61b). The main body water channel 14a and the main body water channel 14b are connected via the main body water channel 14c. Further, the main body water channel 14c has a semicircular arc shape surrounding the sprue 12 over a half circumference.

[0020] (Installation of sprue and bush)

The assembly of the sprue bushing 10 showing the actual use state of the sprue bushing 10 according to the first embodiment will be described in more detail with reference to FIG.

As shown in FIG. 4, the sprue bushing 10 has a pressing surface 10a against which the injection port 20 for injecting the molten material is pressed. The sprue bushing 10 is assembled to the upper mold 31 (the upper mold 31a and the upper mold 31b) via the supported surface 10b and the supported surface 10c. The supported surface 10b is provided with a water supply port 16a for supplying cooling water. The supported surface 10c is provided with a drain port 16b for draining the cooling water.

[0022] The sprue bushing 10 has a sprue 12 formed along the injection direction P of the molten material that the injection port portion 20 injects from the injection port 21. A hollow portion that leads from the inlet 11 to the outlet 13 is formed inside the sprue bush 10 by the spnolet 12. In addition, the sprue 12 has a divergent shape that gradually spreads from the inlet 11 toward the outlet 13 in order to prevent material residue from occurring in the sprue 12.

[0023] The injection port 11 is an opening formed in the pressing surface 10a and into which the molten material is injected. Further, the discharge port 13 is opened toward a runner 40 described later.

[0024] The sprue bushing 10 has a cylindrical main body water channel 14 (main body water channel 14a and main body water channel 14b) that is a cooling water channel formed along the injection direction P of the molten material.

[0025] The sprue bush 10 includes a cylindrical flanged water channel 15 (a flanged water channel 15a and a flanged water channel 15b) that is a cooling water channel formed along the supported surface 1 Ob and the supported surface 10c. Have. The water supply port 16a provided in the supported surface 10b and the main body water channel 14a are connected via the flange part water channel 15a. The drainage port 16b provided in the supported surface 10c and the main body waterway 14b are connected via a flanged waterway 15b.

The upper mold 31a has a water supply channel 33a for supplying cooling water to the water supply port 16a. The upper mold 31b has a drainage channel 33b for draining the cooling water from the drainage port 16b. [0027] Between the supported surface 10b and the upper mold 31a, a packing member 17a (for example, an O-ring or the like) for preventing leakage of cooling water supplied from the water supply port 16a is provided. The packing member 17a is provided so as to surround the periphery of the water supply port 16a. On the other hand, a packing member 17b (for example, O-ring) is provided between the supported surface 10c and the upper mold 31b to prevent leakage of cooling water drained from the drain port 16b. The packing member 17b is provided so as to surround the periphery of the water supply port 16a.

A runner 40 is formed between the lower mold 32 and the upper mold 31a and between the lower mold 32 and the sprue bushing 10. Through the runner 40, the cavity 50 and the sprue 12 formed between the lower mold 32 and the upper mold 31a are connected.

[0029] Thus, the molten material injected by the injection port 20 includes the sprue 12 and the runner.

The molten material filled in the cavity 50 through 40 and filled in the cavity 50 is taken out as a molded product after being cooled.

[0030] In addition, since the pressure applied to the sprue bushing 10 is large when the injection port 20 is pressed against the pressing surface 10a, the flange portion 60a, the flange portion 60b, the main body portion 61a, and the main body portion 6 lb In addition, it is preferable that the metal is formed as an integral member with a metal having good strength.

[0031] In the sprue bushing 10 according to the first embodiment, the main body portion 61 and the flange portion 60 are seamlessly connected. That is, the sprue bushing 10 includes the main body portion 61 and the flange portion 60 as an integral member. Further, the main body water channels 14a, 14b, 14c are formed in the main body portion 61, and the flange portion water channels 15a, 15b are formed in the flange portion 60. Therefore, the cooling water flowing through the main body water channels 14a, 14b, and 14c directly cools the molten material filled in the sprue 12, and the cooling efficiency of the molten material filled in the sprue 12 is improved.

[0032] In addition, flange water channels 15a, 15b connected to the outside of the main body water channels 14a, 14b, 14c and the flange portion 60 are formed along the supported surfaces 16a, 16b. Further, when the injection port of the injection molding machine is pressed against the pressing surface 10a, the supported surfaces 16a and 16b provided on the flange portions 60a and 60b are pressed against the support member, so that the supported surfaces 16a and 16b And the support member are in close contact with each other. Therefore, the main water channels 14a, 14b, 14c and the flange section water The cooling water flowing in the passages 15a and 15b is unlikely to leak along the side surface of the sprue bushing 10, and the cooling water can be prevented from entering the runner or the cavity.

[0033] In this manner, the molten material filled in the sprue can be efficiently cooled, and quality deterioration of the molded product can be suppressed.

[0034] (Manufacturing method of sprue and bush)

Next, a method for manufacturing the sprue bushing 10 will be further described with reference to the drawings. FIG. 5 is a diagram illustrating a method for manufacturing the sprue bushing 10 according to the first embodiment of the present invention. Fig. 14 shows the top and bottom of the spruce bush 10 in Fig. 2 reversed. Fig. 9 (a) (b), 010 (a) (b), Fig. 11 (a) (b), 012 (a) (b), 013 (a) (b) shows the manufacturing process of the spruce bush 10 14 shows a cross-sectional view (FIG. 15), a D cross-sectional view (FIG. 16), an E cross-sectional view (FIG. 17), a F cross-sectional view (FIG. 18), and a G cross-sectional view (FIG. 19). In the first embodiment, the sprue bushing 10 is made of metal. An example in which the sprue bushing 10 is manufactured using the metal stereolithography combined processing method will be described. Here, the “metal stereolithography combined processing method” means that a metal powder material is converted into a YAG laser or CO laser.

2 In the metal stereolithography method that forms a three-dimensional shape by further sintering and stacking by thermal processing such as Zaza, a processing method that improves cutting accuracy and improves dimensional accuracy and surface roughness. Say.

(Ii) First, a metal stereolithography combined processing apparatus 80 as shown in FIG. 6 is prepared. Metal stereolithography composite processing apparatus 80 includes a work stage 81 that can be moved up and down to hold a work, a metal powder stage 82 that can be moved up and down to hold metal powder 90 arranged with a wall 84 sandwiched between work stage 81, and And a blade 83 disposed on the surface of the metal powder 90. As shown in FIG. 7, the metal stereolithography combined processing apparatus 80 further includes a light source 86 for irradiating laser light and a processing machine 85. The metal stereolithography combined machining apparatus is not particularly limited to the metal stereolithography combined machining apparatus 80, and various apparatuses can be used.

(Mouth) Next, as shown in FIG. 5, in step S10, the metal powder as the material of the sprue bushing 10 is applied over a predetermined thickness. For example, as shown in FIG. 6, at least one of the work stage 81 and the metal powder stage 82 is moved up and down to change the relative position, and the blade 83 is moved when the surface of the metal powder 90 is higher than the upper end of the wall 84. The Operate and apply metal powder on work stage 81.

[0037] (C) In step S20, a laser beam is irradiated from the light source 86 to the region (pattern) defined by the phantom line in FIG. Sinter. In this case, the laser beam is not irradiated to the portion to be hollowed (the portion corresponding to the sprue 12, main body water channel 14, flange water channel 15, inlet 11, water supply port 16a, drain port 16b). That is, only the portions corresponding to the flange portion 60 and the main body portion 61 are irradiated with the laser beam. As a result, as shown in FIGS. 9 (a) and 9 (b), the metal powder 91 is integrated with a portion that has already been sintered by laser light irradiation.

(2) In the same manner as in step S 10, the metal powder 91 is applied onto the sintered body 10 C, and further, in step S 20, laser light is irradiated according to the pattern corresponding to FIGS. 10 (a) and (b). In this case, the portion corresponding to the sprue 12 and the flange section water channel 15 (the flange section water channel 15a and the flange section water channel 15b) shown in FIG. Only a portion is irradiated with laser light. Then, a sintered body 10D as shown in FIGS. 10 (a) and 10 (b) is obtained. Steps S10 and S20 are repeated to form sintered bodies 10E, 10F, and 10G as shown in FIGS. 11 (a) (b), 12 (a) 03), and 13 (&) (b). Finally, the sprue bushing 10 is obtained.

[0039] In the process shown in FIGS. 11 (a) and 11 (b), the spnolet 12, the main body water channel 14 (main body water channel 14a and the main body water channel 14b), and the flange section water channel 15 (the flange section water channel 15a and the flange section shown in FIG. The laser beam is irradiated only to the portion corresponding to the flange portion 60 and the main body portion 61 without irradiating the portion corresponding to the partial water channel 15b).

[0040] In the steps shown in FIGS. 12 (a) and 12 (b), the portions corresponding to the sprue 12 and the main body water channel 14 shown in FIG. Irradiate laser light.

[0041] In the steps shown in FIGS. 13 (a) and 13 (b), the portion corresponding to the sprue 12 and the main body water channel 14 (main body water channel 14c) shown in FIG. The laser beam is irradiated only to the relevant part.

[0042] (e) Number of times the processing of step S10 and step S20 is repeated in step S30

It is determined whether (repetition count) has been repeated a predetermined number of times. Also repeat times If the number is a predetermined number, the process proceeds to step S40. If the number of repetitions is less than the predetermined number, the process returns to step S10.

[0043] (F) In step S40, the machine 85 in FIG. 7 is operated on the already sintered portion to perform cutting work and / or shape adjustment.

(G) In step S50, it is determined whether or not the sprue bushing 10 is completed. When the sprue bushing 10 is completed, the series of processing ends, and when the sprue bushing 10 is completed! /, N! /, The processing returns to step S10.

[0045] In this manner, the application and sintering of the metal powder are repeated, and the shape of the already sintered portion is adjusted every time the number of repetitions of the application and sintering reaches a predetermined number, so that the sprue bushing 10 Manufacturing.

As shown in FIG. 15 to FIG. 19, the sprue bushing 10 having a complicated shape can be easily manufactured by using the metal stereolithography combined processing method.

[0047] (Action and effect)

According to the sprue bushing 10 according to the first embodiment of the present invention, the sprue bushing 10 includes the flange portion 60 and the main body portion 61 as an integral member. That is, the flange portion 60 and the main body portion 61 are connected seamlessly. Further, the main body water channel 14 is formed in the main body portion 61, and the flange portion water channel 15 is formed in the flange portion 60. Therefore, the cooling power of the cooling water flowing through the main body portion 61 is directly transmitted to the molten material filled in the sprue 12, and the cooling efficiency of the molten material filled in the sprue 12 is improved.

[0048] Further, a flange portion water channel 15 connected to the main body water channel 14 and the water supply port 16a (or the drain port 16b) is formed along the supported surface 10b (or the supported surface 10c). Further, when the injection port 20 is pressed against the pressing surface 10a, the supported surface 10b (or the supported surface 10c) provided on the flange portion 60 is pressed against the upper mold 31. (Or, the supported surface 10c) and the upper mold 31 are in close contact with each other. Therefore, the cooling water flowing through the main body water channel 14 and the flange portion water channel 15 is unlikely to leak along the side surface of the sprue bushing 10, and the cooling water can be prevented from entering the runner 40 or the cavity 50.

[0049] In this manner, the molten material filled in the sprue can be efficiently cooled, and quality deterioration of the molded product can be suppressed. [0050] Also, according to the sprue bushing 10 according to the first embodiment of the present invention, the main body water channel 14c having a semicircular arc shape surrounding the sprue 12 over a half circumference is provided on the discharge port 13 side. Yes. That is, the volume of the main body water channel 14 on the discharge port 13 side is larger than the volume of the main body water channel 14 on the injection port 11 side.

[0051] Accordingly, since the flow rate of the cooling water flowing through the main body water channel 14 is increased on the side of the discharge port 13 where the volume of the sprue 12 is large, the force S that increases the cooling effect of the molten material filled in the sprue 12 is reduced.

[0052] [Second Embodiment]

Differences between the second embodiment of the present invention and the first embodiment will be mainly described.

[0053] In the spray bush 101 according to the second embodiment, the main body water channel 14d and the main body water channel 14e have a gradient along the inner wall of the sprue 12 having a divergent shape.

As shown in FIG. 20, the sprue 12 has a divergent shape that gradually widens from the inlet 11 toward the outlet 13. That is, as shown in FIG. 21, the extension line L of the inner wall 12a of the sprue 12 has a gradient α with respect to a straight line L substantially parallel to the injection direction of the molten material. Also

1 Ρ

The extension line L of the inner wall 12b of the sprue 12 is a straight line L substantially parallel to the injection direction of the molten material.

2 P has a slope of / 3. It should be noted that 酉酉己 α and 酉酉己 / 3 can be the same or different.

The main body water channel 14 a has a gradient along the inner wall 12 a of the sprue 12. Specifically, the center line C of the main water channel 14a has a gradient α with respect to a straight line substantially parallel to the injection direction of the molten material, like the inner wall 12a. That is, the main body waterway 14a and the inner wall 12a of the sprue 12

P

The distance is kept constant.

[0056] Similarly, the main body water channel 14b has a gradient along the inner wall 12b of the sprue 12. Specifically, the center line C of the main body channel 14b is substantially flat with the injection direction of the molten material, like the inner wall 12b.

2

It has a gradient / 3 with respect to the straight line L. That is, main body waterway 14b and sprue

P One twelve inner walls

The distance to 12b is kept constant.

[0057] (Function and effect)

According to the sprue bushing 10 according to the second embodiment of the present invention, the main body water channel 14a has a gradient along the inner wall 12a of the sprue 12, so that the main body water channel 14a and the inner wall 1 of the sprue 12 are provided. The distance from 2a is kept constant, and it is possible to reduce the cooling unevenness of the molten material filled in the sprue 12 with a force S. Similarly, since the main body water channel 14b has a gradient along the inner wall 12b of the sprue 12, the distance between the main body water channel 14b and the inner wall 12b of the sprue 12 is kept constant, and the melt filled in the sprue 12 is melted. Uneven cooling of the material can be reduced.

[Third Embodiment]

In the following, the difference between the third embodiment of the present invention and the first embodiment will be mainly described.

[0059] As shown in FIG. 22, in the spray bush 102 according to the third embodiment of the present invention, the main body water channel includes a first main body water channel 14a, a fourth main body water channel 14d, and a fifth main body water channel 14e. The The first main body water channel 14a is formed parallel to the central axis of the sprue. One end of the first main body water channel 14a is connected to the water supply port via the flange section water channel, and the other end of the first main body water channel 14a has the cross-sectional shape obtained by going straight in the flow direction of the molten material of the sprue. A sprue defined by a region having a substantially C-shaped cross section including a concentric arc and a circle of the sprue cross section is connected to a fourth main water channel 14d formed so as to surround the sprue on the large diameter side. The other end of the fourth main body water channel 14d is formed so as to be connected to the drain port 16b via a flanged water channel 15b.

[0060] In the first embodiment described above, the third main body water channel 14c that connects the first main body water channel 14a and the second main body water channel 14b has a semicircular arc shape that surrounds the sprue 12 over a half circumference. . On the other hand, in the third embodiment, the fourth main body water channel 14d that connects the first main body water channel 14a and the fifth main body water channel 14e has a substantially arc shape surrounding the sprue 12 over substantially the entire circumference. It has a shape.

As shown in FIGS. 23 and 24, the fifth main body water channel 14 e has a spiral shape along the sprue 12. The fourth main body water channel 14d has a substantially arcuate shape surrounding the sprue 12 over substantially the entire circumference.

[0062] (Action and effect)

According to the sprue bushing 10 according to the third embodiment of the present invention, the fourth main body water channel 14d that connects the first main body water channel 14a and the fifth main body water channel 14e surrounds the sprue 12 over substantially the entire circumference. It has a substantially arc shape. The fourth main body channel 14d is provided on the outlet 13 side. It has been. That is, the capacity force of the fourth main body water channel 14d provided on the discharge port 13 side is larger than that in the first embodiment described above.

[0063] Accordingly, since the flow rate of the cooling water is increased on the discharge port 13 side where the volume of the sprue 12 is larger than that in the first embodiment, the cooling effect of the molten material filled in the sprue 12 is further enhanced. be able to.

[0064] [Other Embodiments]

The present invention is illustrated by the embodiments. It should not be understood that the description and the drawings, which form a part of this disclosure, limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

[0065] For example, in the first to third embodiments, the water supply port 16a is formed on the supported surface 10b, and the drain port 16b is a force formed on the supported surface 10c. is not. Specifically, the water supply port 16a and the drain port 16b may be provided in any part as long as it is a part other than the pressing surface 10a.

[0066] In the first to third embodiments, the main body water channel 14 and the flanged water channel 15 have a cylindrical shape, but are not limited thereto. Specifically, the shape of the main body water channel 14 may be appropriately changed according to the cooling efficiency of the molten material filled in the sprue 12. In addition, the shape of the flange section 15 can be appropriately changed according to the cooling water supply efficiency and cooling water drainage efficiency.

[0067] In the first embodiment to the third embodiment, the main body water channel 14c that connects the main body water channel 14a and the main body water channel 14b is a force that is provided only on the discharge port 13 side. . Specifically, the number of main body water channels 14c may be plural, and the position of the main body water channels 14c may be provided closer to the inlet 11 than in the first to third embodiments.

In the first to third embodiments, the support member that supports the sprue bushing 10 is the force S that is the upper mold 31, and is not limited to this. Specifically, a support member that supports the sprue bushing 10 may be provided separately from the upper mold 31.

[0069] In the first to third embodiments, the sprue bushings 10, 101, 102 are manufactured using a metal photo-molding composite processing method, but the present invention is not limited to this. Specifically, the sprue bushing 10, 101, 102 is cut by cutting a metal block to form the sprue bushing 10, 101, 102. The punolet 12, the main body water channel 14, the flanged water channel 15, the injection port 11, the water supply port 16a, and the drain port 16b may be formed by cutting. In addition, the sprue bushing 10, main body waterway 14, flange section waterway 15, injection port 11, water supply port 16a and drainage port 16b are placed in the forging furnace, and the material for making up the sprue bushing 10 is added. The sprue 12, the main body water channel 14, the flange part water channel 15, the inlet 11, the water supply port 16 a and the water outlet 16 b may be formed by melting the soot after pouring into the forging furnace.

[0070] In the first to third embodiments, the water supply port 16a and the drain port 16b are formed. In this case, as long as the flow direction of the cooling water is maintained in one direction, the cooling water is not only injected from the water supply port 16a and discharged from the water discharge port 16b, but also injected from the water discharge port 16b and from the water supply port 16a. It may be discharged.

[0071] This application is accompanied by a claim for priority based on a Japanese patent application filed earlier by the same applicant, ie, Japanese Patent Application No. 2006-2 62536 (filed on September 27, 2006). These specifications are hereby incorporated by reference.

Industrial applicability

[0072] According to the present invention, there is provided a sprue bushing and a method for manufacturing the sprue bushing that can efficiently cool the molten material filled in the sprue and suppress the quality deterioration of the molded product.

Claims

The scope of the claims

[1] A sprue having an inlet formed to be connectable to an injection port of an injection molding machine at one end and a discharge port formed to be connectable to the mold cavity when attached to the mold at the other end A cylindrical sprue bushing body with a body channel embedded in a part of the area excluding the sprue,

A sulf comprising: a flanged water channel extending from the inlet side end of the sprue bushing main body, connected to the sprue bushing main body and continuing to the main body water channel and leading to the outside. Lou Bush.

2. The water supply port and the water discharge port that are continuous to the flanged water channel are provided on the supported surface when the flange is attached to the mold. The spring bush.

3. The sprue bush according to claim 1, wherein the sprue has a hollow conical shape whose diameter increases from one end to the other end in the flow direction of the molten material.

4. The sprue bush according to claim 1, wherein the main body water channel is formed so as to surround the sprue on the sprue outlet side.

[5] The cross-sectional shape obtained by the main body water channel being orthogonal to the flow direction of the molten material of the sprue is defined by a region having a substantially C-shaped cross section including an arc concentric with the circle of the sprue cross-section. 5. The sprue bush according to claim 4, wherein the sprue bush is formed so as to surround a circumference of the sprue on the discharge port side of the sprue bushing main body.

6. The sprue bush according to claim 1, wherein a volume of the main body water channel on the mold side is larger than a volume of the main body water channel on the inlet side.

[7] A hollow, generally conical sprue with a diameter increasing from one end to the other in the flow direction of the molten material is provided inside the main body, and one end on the small diameter side of the sprue can be connected to the injection port of the injection molding machine An inlet is formed at the other end of the sprue, and the other end on the large diameter side of the sprue is connected to the mold cavity when attached to the mold, and an outlet is formed. A cylindrical sprue bushing body in which a body water channel is embedded so as to surround the sprue on the discharge port side; Projected from the inlet side end of the sprue bushing main body, connected to the sprue bushing main body, connected to the main body water channel and embedded in a flange water channel so as to communicate with the outside, and supported when attached to the mold A sprue bush, comprising: a flange portion provided with a water supply port and a drain port continuous with the flange channel on the surface.

[8] The main body water channel includes the first main body water channel, the second main body water channel, and the third main body water channel, and the first main body water channel and the second main body water channel are formed of the sprue. It is formed in parallel with the central axis of the molten material flow direction, and one end of the first main body water channel and the second main body water channel are connected to the water supply port or the water discharge port through the flange part water channel, respectively. The other end of the first main body water channel and the second main body water channel are connected to each other by a third main body water channel formed so as to surround the periphery of the sprue on the discharge port side of the sprue. The sprue bushing according to claim 7,

9. The sprue bush according to claim 8, wherein the first main body water channel and the second main body water channel have a gradient along the inner wall of the sprue.

[10] The main body water channel includes the first main body water channel, the fourth main body water channel, and the fifth main body water channel, and a first main body water channel is formed in parallel to a central axis of the sprue, One end of the first main body water channel is connected to the water supply port through the flange section water channel, and the other end of the first main body water channel is a cross-sectional shape obtained by going straight in the flow direction of the molten material of the sprue. Is connected to a fourth main body channel formed so as to surround the periphery of the sprue on the large diameter side of the sprue defined by a region having a substantially C-shaped cross section including an arc concentric with the circle of the sprue cross section, The sprue bush according to claim 7, wherein the other end of the fourth main body water channel is formed so as to be connected to the drain through the flanged water channel.

[11] applying metal powder;

A hollow substantially conical sprue whose diameter increases from one end to the other end in the flow direction of the molten material is provided inside the main body, and one end on the small diameter side of the sprue is connected to an injection port portion of an injection molding machine. The other end on the large diameter side of the sprue is formed with a discharge port so that it can be connected to the mold cavity when attached to the mold. A cylindrical sprue bushing body in which a main body water passage is embedded in a part of the sprue so as to surround the periphery of the sprue on the discharge port side of the sprue,

Projected from the inlet side end of the sprue bushing main body, connected to the sprue bushing main body, connected to the main body water channel and embedded in a flange water channel so as to communicate with the outside, and supported when attached to the mold The sprue, the main body based on a cross-sectional shape pattern obtained by directing in the flow direction of the molten material of a sprue bushing having a flange and a flanged portion provided with a water supply port and a drainage port that are continuous with the flanged water channel. Except for the water channel, the flanged water channel, the water supply port, and the portion corresponding to the water discharge port, the metal powder is thermally processed by laser light irradiation! It is further sintered and stacked to form a three-dimensional shape. And a process of

Cutting into the three-dimensional shape;

The manufacturing method of the sprue bush characterized by including these.

[12] The main body water channel includes the first main body water channel, the second main body water channel, and the third main body water channel, and the first main body water channel and the second main body water channel are formed of the sprue. It is formed in parallel with the central axis of the molten material flow direction, and one end of the first main body water channel and the second main body water channel are connected to the water supply port or the water discharge port through the flange part water channel, respectively. The other ends of the first main body water channel and the second main body water channel are connected to each other by a third main body water channel formed so as to surround the sprue on the discharge port side of the sprue. The method for producing a sprue bush according to claim 11.

13. The sprue bushing manufacturing method according to claim 11, wherein the first main body water channel and the second main body water channel have a gradient along the inner wall of the sprue.

[14] The main body water channel includes the first main body water channel, the fourth main body water channel, and the fifth main body water channel, wherein a first main body water channel is formed in parallel to a central axis of the sprue, One end of the first main body water channel is connected to the water supply port through the flange section water channel, and the other end of the first main body water channel is a cross-sectional shape obtained by going straight in the flow direction of the molten material of the sprue. Is formed so as to surround the periphery of the sprue on the large diameter side of the sprue defined by a region having a substantially C-shaped cross section including an arc concentric with the circle of the sprue cross section. 12. The sprue bushing according to claim 11, wherein the sprue bush is connected to a fourth main body water channel, and the other end of the fourth main body water channel is connected to the drainage port via the flanged water channel. Production method.