JP5001289B2 - Sprue bushing and manufacturing method thereof - Google Patents

Description

  The present invention relates to a sprue bushing and a manufacturing method thereof.

  2. Description of the Related Art Conventionally, injection molding for forming a product by injecting a material melted by heating (hereinafter referred to as a molten material) into a mold is generally widely known.

  Specifically, a mold used for injection molding has a sprue bush against which an injection port portion of an injection molding machine that injects a molten material is pressed, 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. The sprue and cavity are connected via a runner.

  In such an injection mold, the molded material is taken out from the cavity after the molten material filled in the cavity is sufficiently cooled and solidified. 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.

  In general, the volume per unit area is larger for sprues and runners than for cavities. 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.

  In contrast, a mold for injection molding that shortens the time required for the molten material filled in the runner to harden by forming a cooling water flow path in the member that forms the runner is proposed. (For example, Patent Document 1).

  Here, when cooling the members forming the runner and the sprue bushing (hereinafter referred to as sprue bushing or the like) with cooling water, in order to increase the cooling efficiency of the sprue bushing or the like, the flow path of the cooling water inside the sprue bushing or the like Is preferably formed.

  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. Further, 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 sprue bush.

However, since the water supply port and the drainage port communicate with the outside of the sprue bush, the cooling water supplied from the water supply port and the cooling water supplied from the drainage port may leak along the outer surface of the sprue bushing. As described above, when the cooling water leaked along the outer surface of the sprue bush enters the runner or the cavity, the quality of the molded product is deteriorated.
JP 2002-18909 A (Claim 1, FIG. 2, etc.)

  The present invention has been made in order to solve the above-described problems, and a sprue bush capable of efficiently cooling a molten material filled in a sprue and suppressing quality deterioration of a molded product, and It aims at providing the manufacturing method.

(Means for solving the problem)
The first feature of the present invention is that an injection port formed at one end so as to be connectable to an injection port portion of an injection molding machine, and an exhaust formed so as to be connectable to a mold cavity when attached to the mold at the other end. A sprue with an outlet is provided inside the main body, a cylindrical sprue bushing body in which a main body water channel is embedded in a part of the area excluding the sprue, and an inlet side end of the sprue bushing body, and is connected to the sprue bushing main body. and summarized in that flange portion waterway leading to the continuous external to the body waterway is sprue bushing and a flange portion which is embedded.

The second feature of the present invention is that a metal powder is applied, and 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. One end has an injection port 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 has a discharge port that can be connected to the mold cavity when attached to the mold. A cylindrical sprue bushing body with a body water channel embedded in the part of the sprue area surrounding the sprue on the sprue outlet side, and protruding from the inlet side end of the sprue bushing body and connected to the sprue bushing body. is embedded flange section waterways as continuous waterway leading to the outside, flange portion water supply port and drain port is provided continuous with the flange portion waterway supported surface when attached to the mold, the Preparation Based on the pattern of the cross-sectional shape obtained by perpendicular to the flow direction of the molten material that sprue bushing, sprue, body canals, flange portion waterways, water supply port, except for the portion corresponding to the drain opening, the laser beam to the metal powder The gist of the present invention is a sprue bushing manufacturing method including a step of performing thermal processing by irradiation and further sintering and stacking to form a three-dimensional shape and a step of cutting into a three-dimensional shape.

1 is a perspective view of a sprue bushing 10 according to a first embodiment of the present invention. It is sectional drawing which shows the structure of the sprue bush 10 which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the structure of the sprue bush 10 which concerns on 1st Embodiment of this invention. It is sectional drawing for demonstrating the assembly | attachment of the sprue bush 10 which concerns on 1st Embodiment of this invention. It is a flow figure showing a manufacturing method of sprue bushing 10 concerning a 1st embodiment of the present invention. It is a manufacturing-process figure (manufacturing apparatus schematic) of the sprue bushing 10 concerning 1st Embodiment of this invention. It is a manufacturing-process figure (manufacturing apparatus schematic) of the sprue bushing 10 concerning 1st Embodiment of this invention. It is a manufacturing-process figure of the sprue bush 10 which concerns on 1st Embodiment of this invention. It is a manufacturing process figure ((a) top view, (b) sectional view) of sprue bushing 10 concerning a 1st embodiment of the present invention. It is a manufacturing process figure ((a) top view, (b) sectional view) of sprue bushing 10 concerning a 1st embodiment of the present invention. It is a manufacturing process figure ((a) top view, (b) sectional view) of sprue bushing 10 concerning a 1st embodiment of the present invention. It is a manufacturing process figure ((a) top view, (b) sectional view) of sprue bushing 10 concerning a 1st embodiment of the present invention. It is a manufacturing process figure ((a) top view, (b) sectional view) of sprue bushing 10 concerning a 1st embodiment of the present invention. It is a figure for demonstrating the manufacturing method of the sprue bush 10 which concerns on 1st Embodiment of this invention. 1 is a cross-sectional view of a sprue bushing 10 according to a first embodiment of the present invention. 1 is a cross-sectional view of a sprue bushing 10 according to a first embodiment of the present invention. 1 is a cross-sectional view of a sprue bushing 10 according to a first embodiment of the present invention. 1 is a cross-sectional view of a sprue bushing 10 according to a first embodiment of the present invention. 1 is a cross-sectional view of a sprue bushing 10 according to a first embodiment of the present invention. It is a perspective view of the sprue bush 10 which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the structure of the sprue bush 10 which concerns on 2nd Embodiment of this invention. It is a perspective view of the sprue bushing 10 which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows the structure of the sprue bush 10 which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows the structure of the sprue bush 10 which concerns on 3rd Embodiment of this 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. In addition, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones. Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings. In FIG. 1, from the viewpoint of clarity of sprue bushing 10 inside the arrangement relationship, shown sprue 12, body canals 14a, 14b, 14c, flange portion waterway 15a, 15b, the water supply port 16a, a drain port 16b by a solid line shows a sprue bushing body 61 and the flange portion 60 by a two-dot chain line. 20 and 24 are the same as those in FIG.

[First Embodiment]
FIG. 1 shows a perspective view of a sprue bushing 10 according to a first embodiment of the present invention.

As shown in FIG. 1, the sprue bush 10 according to the first embodiment is provided with a hollow substantially conical sprue 12 having a diameter that increases from one end to the other end in the flow direction of the molten material. An injection port 11 is formed so that one end on the small diameter side of the sprue 12 can be connected to the injection port portion of the injection molding machine, and a discharge port 13 can be connected to the cavity of the mold when the other end on the large diameter side of the sprue 12 is attached to the mold. A cylindrical sprue bushing body 61 in which main body water channels 14a, 14b, 14c are embedded in a part of the region excluding the sprue 12 so as to surround the periphery of the sprue 12 on the discharge port 13 side of the sprue 12,
Is connected to the sprue bushing body 61 projecting from the inlet 11 end of the sprue bushing body 61, body canals 14a, 14b, flange portion waterway 15a as leading continuous to the outside 14c, 15b are embedded, attached to the mold comprising flange portions waterways 15a in the supported surface when that is, a flange portion 60 which water supply port 16a and the discharge port 16b is provided continuous to 15b, a.

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 14 a and the second main body water channel 14 b 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 body waterways 14a and the second body waterway 14b is connected to the water supply port 16a Moshiku water outlet 16b, respectively, via the flange portion waterway 15a, 15b . As shown in FIG.3 (b), the 3rd main body formed so that the other end of the 1st main body water channel 14a and the 2nd main body water channel 14b might surround the circumference | surroundings of the sprue 12 in the discharge port 16b side of a sprue. They are connected to each other by a water channel 14c.

As shown in FIG. 3 (a), at least a portion of the flange portion waterway 15a, is formed in the flange portion 60 (flange portion 60a) inside. Further, through the flange portion waterway 15a, and the water supply port 16a and the body waterway 14a provided on the supporting surface 10b is connected. On the other hand, at least a portion of the flange portion waterway 15b is formed in the flange portion 60 (flange portion 60b) within. Further, through the flange portion waterways 15b, it is connected the drain outlet 16b and body waterway 14b provided on the support surface 10c.

  As shown in FIG. 3B, the main body water channel 14c is formed in the 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. The main body water channel 14c has a semicircular arc shape surrounding the sprue 12 over a half circumference.

(Assembly of sprue bushing)
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.

  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. The sprue 12 forms a hollow portion in the sprue bush 10 that leads from the inlet 11 to the outlet 13. Further, the sprue 12 has a divergent shape that gradually spreads from the inlet 11 toward the outlet 13 in order to prevent a material residue from being generated in the sprue 12.

  The injection port 11 is an opening formed in the pressing surface 10a and into which the molten material is injected. Moreover, the discharge port 13 is opening toward the runner 40 mentioned later.

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

Sprue bushing 10 has a a flow path of the cooling water which is formed along the supported surface 10b and the supported surface 10c cylindrical flange portion waterway 15 (flange portion waterways 15a and flange portion waterway 15b) . Through the flange portion waterway 15a, and the water supply port 16a and the body waterway 14a provided on the supporting surface 10b is connected. Through the flange portion waterways 15b, are connected the drain outlet 16b and body waterway 14b provided on the support surface 10c.

  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 cooling water from the drainage port 16b.

  Between the supported surface 10b and the upper mold 31a, there is provided a packing member 17a (for example, O-ring) for preventing leakage of cooling water supplied from the water supply port 16a. 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 31 a 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.

  Thus, the molten material injected by the injection port 20 is filled into the cavity 50 through the sprue 12 and the runner 40, and the molten material filled in the cavity 50 is taken out as a molded product after being cooled. .

  Further, 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 61b have good strength. It is preferable that the metal is constituted as an integral member.

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. The main body canals 14a, 14b, 14c are formed in the body portion 61, flange portion waterway 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.

The main body canals 14a, 14b, 14c and flange portion waterways 15a leading to the outside of the flange portion 60, 15b is formed along the support surface 1 0b, 1 0c. Further, since the pressed against the surface 10a exit portion Pushing the injection molding machine, the flange portion 60a, the supported surface 1 0b, 1 0c provided 60b is pressed against the support member, the support surface 1 0b , 10c and the support member are in close contact with each other. Therefore, it is possible to suppress body canals 14a, 14b, 14c and flange portion waterway 15a, the cooling water flowing in 15b is hard to leak along the side of the sprue bushing 10, a cooling water enters the runners and cavity .

  As described above, it is possible to efficiently cool the molten material filled in the sprue and to suppress the quality deterioration of the molded product.

(Sprue bushing manufacturing method)
Next, the manufacturing method of the sprue bushing 10 will be further described with reference to the drawings. FIG. 5 is a flowchart showing a method for manufacturing the sprue bushing 10 according to the first embodiment of the present invention. FIG. 14 is a reverse view of the sprue bush 10 of FIG. 9 (a) (b), FIG. 10 (a) (b), FIG. 11 (a) (b), FIG. 12 (a) (b), FIG. 13 (a) and FIG. FIG. 14 is a sectional view of the sprue bushing 10 in FIG. 14 (FIG. 15), a sectional view of D (FIG. 16), a sectional view of E (FIG. 17), a sectional view of F (FIG. 18), and a sectional view of G. 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” is a metal stereolithography method in which a metal powder material is further sintered and stacked by thermal processing such as YAG laser or CO ₂ laser to form a three-dimensional shape. This is a processing method in which cutting is applied during the process to improve dimensional accuracy and surface roughness.

(A) First, a metal stereolithography combined machining apparatus 80 as shown in FIG. 6 is prepared. The metal stereolithography combined machining 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 a metal powder 90 arranged with a wall 84 interposed between the work stage 81, and a metal powder. And a blade 83 disposed on the surface of 90. As shown in FIG. 7, the metal stereolithography combined processing apparatus 80 further includes a light source 86 that irradiates laser light and a processing machine 85. In addition, as a metal optical modeling composite processing apparatus, various apparatuses can be used without being restrict | limited to the metal optical modeling composite processing apparatus 80 in particular.

(B) Next, as shown in FIG. 5, in step S10, a metal powder as a 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 when the surface of the metal powder 90 becomes higher than the upper end of the wall 84, the blade 83. Is applied to apply metal powder on the work stage 81.

(C) In step S20, the metal powder 91 is sintered by irradiating a laser beam from the light source 86 onto the region (pattern) defined by the phantom line in FIG. To do. In this case, the portion to be a cavity (sprue 12 stated above, the body canals 14, flange portion waterway 15, inlet 11, water inlet 16a, the drain port 16b) in the portion) corresponding to the not irradiated with laser light. That is, only the portions corresponding to the flange portion 60 and the main body portion 61 are irradiated with laser light. As a result, as shown in FIGS. 9A and 9B, the metal powder 91 is integrated with a portion that has already been sintered by the irradiation of the laser beam.

(D) In the same manner as in step S10, the metal powder 91 is applied onto the sintered body 10C, and in step S20, laser light is irradiated according to the pattern corresponding to FIGS. 10 (a) and 10 (b). In this case, without irradiating the laser beam on the portion corresponding to the sprue 12 and the flange portion waterway 15 shown in FIG. 16 (flange portion waterways 15a and flange portion waterway 15b), the flange portion 60 and a body portion 61 The laser beam is irradiated only on the corresponding part. Then, a sintered body 10D as shown in FIGS. 10A and 10B is obtained. Such steps S10 and S20 are repeated to form sintered bodies 10E, 10F, and 10G as shown in FIGS. 11A, 11B, 12A, 12B, and 13A, 13B. Finally, the sprue bushing 10 is obtained.

Figure 11 (a) In the step (b), the sprue 12 shown in FIG. 17, body canals 14 (main water passage 14a and main water passage 14b) and flange portions waterway 15 (flange portion waterways 15a and flange portion waterways The portion corresponding to 15b) is not irradiated with the laser beam, but only the portion corresponding to the flange portion 60 and the main body portion 61 is irradiated with the laser beam.

  In the process shown in FIGS. 12A and 12B, the laser beam is not irradiated to the portions corresponding to the sprue 12 and the main body water channel 14 shown in FIG. Irradiate.

  In the steps shown in FIGS. 13A and 13B, the portion corresponding to the main portion 61 without irradiating the portion corresponding to the sprue 12 and the main passage 14 (main passage 14c) shown in FIG. Only the laser beam is irradiated.

(E) In step S30, it is determined whether or not the number of times of repeating the processing of step S10 and step S20 (the number of repetitions) has been repeated a predetermined number of times. If the number of repetitions 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.

(F) In step S40, the processing machine 85 of FIG. 7 is operated to adjust the shape of the already sintered portion by cutting.

(G) In step S50, it is determined whether or not the sprue bushing 10 is completed. When the sprue bushing 10 is completed, a series of processes is terminated, and when the sprue bushing 10 is not completed, the process returns to step S10.

  Thus, while repeating application | coating and sintering of metal powder, whenever the repetition frequency of application | coating and sintering becomes a predetermined number of times, the shape of the already sintered part is prepared and the sprue bush 10 is manufactured.

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

(Function 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 seamlessly connected. Also, body canals 14 is formed in the body portion 61, flange portion waterway 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.

Also, flange portion waterway 15 connected to the main body water channel 14 and the water supply port 16a (or drain port 16b) is supported surface 10b (or, the supported surface 10c) is formed along a. 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, and therefore the supported surface 10b. (Or the supported surface 10c) and the upper mold 31 are in close contact with each other. Therefore, it is possible to prevent the cooling water flowing through the main water channel 14 and the flange portion waterway 15 is hard to leak along the side of the sprue bushing 10, the cooling water enters the runner 40 and cavity 50.

  As described above, it is possible to efficiently cool the molten material filled in the sprue and to suppress the quality deterioration of the molded product.

  Moreover, according to the sprue bush 10 which concerns on 1st Embodiment of this invention, the main body water channel 14c which has the shape of a semicircular arc surrounding the sprue 12 over a semicircle is provided in the discharge port 13 side. 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.

  Therefore, since the flow rate of the cooling water flowing through the main body water channel 14 increases on the side of the discharge port 13 where the volume of the sprue 12 is large, the cooling effect of the molten material filled in the sprue 12 can be enhanced.

[Second Embodiment]
A difference between the second embodiment of the present invention and the first embodiment will be mainly described.

  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 extended line L ₁ of the inner wall 12a of the sprue 12 has a slope α with respect to the exit direction substantially parallel to the straight line L _p of the molten material. Furthermore, an extension L ₂ of the inner wall 12b of the sprue 12 has a slope β with respect to the exit direction substantially parallel to the straight line L _p of the molten material. Note that the gradient α and the gradient β may 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 ₁ of the main water passage 14a, as well as the inner wall 12a, having a slope α with respect to the exit direction substantially parallel to the straight line L _p of the molten material. That is, the distance between the main body water channel 14a and the inner wall 12a of the sprue 12 is kept constant.

Similarly, the main body water channel 14 b has a gradient along the inner wall 12 b of the sprue 12. Specifically, the center line C ₂ of the body waterways 14b, like the inner wall 12b, having a slope β with respect to the exit direction substantially parallel to the straight line L _p of the molten material. That is, the distance between the main body water channel 14b and the inner wall 12b of the sprue 12 is kept constant.

(Function and effect)
According to the sprue bushing 10 according to the second embodiment of the present invention, since the main body water channel 14a has a gradient along the inner wall 12a of the sprue 12, the distance between the main body water channel 14a and the inner wall 12a of the sprue 12 is kept constant. The cooling unevenness of the molten material filled in the sprue 12 can be reduced. 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 cooling unevenness of the molten material filled in the sprue 12 is maintained. 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.

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 first main body water channel 14a is formed in parallel to the central axis of the sprue. One end of the first body waterways 14a leads to water inlet through the flange portion waterways, the other end of the first body waterways 14a is a cross-sectional shape obtained by perpendicular to the flow direction of the molten material of the sprue the The sprue is connected to a fourth main body channel 14d 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 a concentric arc and a circle of the sprue cross section. The other end of the fourth main waterway 14d is formed so as to be connected to the drain outlet 16b through the flange portion waterway 15b.

  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 passage 14d that connects the first main body water passage 14a and the fifth main body water passage 14e has a substantially arc shape that surrounds the sprue 12 over substantially the entire circumference. Have

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

(Function 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. Moreover, the 4th main body water channel 14d is provided in the discharge port 13 side. That is, the volume of the fourth main body water channel 14d provided on the discharge port 13 side is larger than that of the first embodiment described above.

  Therefore, since the flow rate of the cooling water is increased as compared with the first embodiment described above on the discharge port 13 side where the volume of the sprue 12 is large, the cooling effect of the molten material filled in the sprue 12 can be further enhanced.

[Other Embodiments]
Although the present invention has been described with reference to the embodiments, it should not be understood that the descriptions and drawings constituting 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.

  For example, in the first to third embodiments, the water supply port 16a is formed in the supported surface 10b, and the drain port 16b is formed in the supported surface 10c, but is not limited thereto. 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.

In the first to third embodiments, the body water channel 14 and the flange portion waterway 15, has the cylindrical shape, but is 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. The shape of the flange portion waterway 15 may be appropriately changed according to the water supply efficiency and wastewater efficiency of the cooling water of the cooling water.

  In the first to third embodiments, only one main body water channel 14c that connects the main body water channel 14a and the main body water channel 14b is provided on the discharge port 13 side, but the present invention is not limited to this. 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 1st Embodiment-3rd Embodiment, although the support member which supports the sprue bush 10 is the upper metal mold | die 31, it is not limited to this. Specifically, a support member that supports the sprue bushing 10 may be provided separately from the upper mold 31.

In 1st Embodiment-3rd Embodiment, although the sprue bushes 10, 101, 102 are manufactured using a metal stereolithography composite processing method, it is not limited to this. Specifically, by cutting a metal block for configuring the sprue bushing 10,101,102, sprue 12, body canals 14, flange portion waterway 15, inlet 11, a water supply port 16a and discharge port 16b You may form by cutting. Further, the sprue 12, body canals 14, flange portion waterway 15, inlet 11, on which a wax corresponding to the water supply port 16a and the water outlet 16b arranged in the casting furnace, the material for constituting the sprue bushing 10 by dissolving wax after flushing the casting furnace, the sprue 12, body canals 14, flange portion waterway 15, inlet 11 may be formed water supply port 16a and the discharge port 16b.

  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 drain port 16b, but also injected from the drain port 16b and discharged from the water supply port 16a. It doesn't matter.

  This application is accompanied by a priority claim based on a Japanese patent application previously filed by the same applicant, ie, Japanese Patent Application No. 2006-262536 (filing date: September 27, 2006). The specification is hereby incorporated by reference.

Industrial applicability

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

Claims (14)

A sprue having an injection port formed at one end to be connectable to the injection port of the injection molding machine and a discharge port formed at the other end to be connectable to the mold cavity when attached to the mold. A cylindrical sprue bushing body having a body water channel embedded in a part of the region excluding the sprue,
Said protruding from the inlet end of the sprue bushing body, the sprue bushing is connected to the body, the body waterway continuous flange portion which flange portion waterway is embedded leading to the outside,
Equipped with a,
It said flange portion, that has water inlet and water outlet from said inlet of said flange portion continuous with the flange portion waterway supported surface when attached to the mold is a surface opposite to provided Sprue bush characterized by that. The sprue, sprue bushing of claim 1, wherein the empty circular cone in which the diameter toward the other end from one end of the flow direction of the molten material increases.   The sprue bush according to claim 1, wherein the main body water channel is formed so as to surround a periphery of the sprue on an outlet side of the sprue. Wherein such body canals, the cross-sectional shape obtained by perpendicular to the flow direction of the molten material of the sprue is defined by the shape of the area of the cross-sectional surface C including the arc of a circle concentric with the sprue section, said sprue 4. The sprue bush according to claim 3 , wherein the sprue bush is formed so as to surround the periphery of the sprue on the discharge port side of the bush main body.   The sprue bush according to claim 1, wherein the volume of the main body water channel on the mold side is larger than the volume of the main body water channel on the inlet side. Check circular conical sprue in the diameter toward the other end from one end of the flow direction of the molten material increases is provided in the main body, the smaller diameter side end is coupleable to the inlet to the injection port of the injection molding machine of the sprue The other end on the large diameter side of the sprue is formed with a discharge port so that it can be connected to a cavity of the mold when attached to the mold, and the discharge port of the sprue is partially formed in a region excluding the sprue. A cylindrical sprue bushing body in which a body water channel is embedded so as to surround the periphery of the sprue on the side;
Wherein said projecting from said inlet side end of the sprue bushing body is connected to the sprue bushing body, the continuously main waterway is embedded flange section waterways as leading to the outside, opposite to the inlet of said flange portion sprue bushing, characterized in that it comprises a water inlet and a flange portion which drain port is provided, the continuing to the flange portion waterway supported surface of a surface when attached to the mold. 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 the flow of the molten material of the sprue. It is formed parallel to the central axis direction, wherein the first body waterways second body end of the waterway leads to each of the flange portions through the waterway verses also the water inlet the water outlet, the first The other end of the main body water channel and the second main body water channel are connected to each other by a third main body water channel formed to surround the sprue on the discharge port side of the sprue. Item 7. The sprue bushing according to item 6 . The sprue bush according to claim 7 , wherein the first main body water channel and the second main body water channel have a gradient along an inner wall of the sprue. 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 the first main body water channel is formed in parallel to the central axis of the sprue, and the first main body water channel is formed. one end of the waterway, the flange portion leading to the water supply port via the water passage, the other end of the first body waterways, cross sectional shape wherein the sprue cross section obtained by perpendicular to the flow direction of the molten material in the sprue circle and leads to the fourth body canals which are formed so as to surround the periphery of the sprue in a large diameter side of the sprue defined by shaped area of the cross section C comprising concentric arcs, the fourth sprue bushing according to claim 6, wherein the other end of the body canals, characterized in that it is formed so as to be connected to the drain outlet through the flange portion waterways. Applying metal powder to a predetermined thickness on a work stage;
Check circular conical sprue in the diameter toward the other end from one end of the flow direction of the molten material increases is provided in the main body, the smaller diameter side end is coupleable to the inlet to the injection port of the injection molding machine of the sprue The other end on the large diameter side of the sprue is formed with a discharge port so that it can be connected to a cavity of the mold when attached to the mold, and the discharge port of the sprue is partially formed in a region excluding the sprue. A cylindrical sprue bush main body in which a main body water channel is embedded so as to surround the periphery of the sprue on the side,
Wherein said projecting from said inlet side end of the sprue bushing body is connected to the sprue bushing body, the flange portion waterways as leading to continuous external to the body waterway is embedded, the supported when attached to the die based on the pattern of the cross-sectional shape obtained by orthogonal the flange portion water supply port and drain port is provided continuous with the flange portion waterways, the flow direction of the molten material sprue bushing provided with a face, the sprue, the body water channel, said flange portion waterways, the water supply port, except for the portion corresponding to the drain outlet, to form a three-dimensional shape by stacking and further is further sintered by thermal processing by laser irradiation on the metal powder When,
A step of arranging a line I-shaped cutting the three-dimensional shape,
The manufacturing method of the sprue bush characterized by including these.   The sprue bushing manufacturing method according to claim 10, wherein the supported surface of the flange portion is a surface opposite to the injection port of the flange portion. 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 the flow of the molten material of the sprue. It is formed parallel to the central axis direction, wherein the first body waterways second body end of the waterway leads to each of the flange portions through the waterway verses also the water inlet the water outlet, the first The other end of the main body water channel and the second main body water channel are connected to each other by a third main body water channel formed to surround the sprue on the discharge port side of the sprue. Item 12. A method for producing a sprue bush according to Item 10 or 11. The sprue bushing manufacturing method according to claim 10 or 11, wherein the first main body water channel and the second main body water channel have a gradient along an inner wall of the sprue. 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 the first main body water channel is formed in parallel to the central axis of the sprue, and the first main body water channel is formed. one end of the waterway, the flange portion leading to the water supply port via the water passage, the other end of the first body waterways, cross sectional shape wherein the sprue cross section obtained by perpendicular to the flow direction of the molten material in the sprue circle and leads to the fourth body canals which are formed so as to surround the periphery of the sprue in a large diameter side of the sprue defined by shaped area of the cross section C comprising concentric arcs, the fourth the other end of the body waterway claim 10 or 11 sprue bushing method according to, characterized in that it is formed so as to be connected to the drain outlet through the flange portion waterways.

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