TWI778818B - Pipe bend die core assembly and method for manufacturing the pipe bend structure - Google Patents

Abstract

An elbow mold core assembly includes a first mold core, a second mold core and a fillet mold core. The first mold core includes a first long straight section and a first curved arc section. The first curved arc segment has a first outer arc side and a first inner arc side. The end of the first curved arc segment has a first chamfered surface. The second mold core includes a second long straight section and a second curved arc section. The second curved arc segment has a second outer arc side and a second inner arc side. The end of the second curved arc segment has a second embedded inclined surface. The fillet mold core includes an embedded body, and the embedded body has a straight outer edge and a concave arc outer edge. When the first mold core and the second mold core are in close contact with each other, a part of the first embedded inclined surface is closely attached to the second embedded inclined surface, and the rounded mold core is embedded between the first mold core and the second mold core. During the time, the outer edge of the concave arc cooperates with the first inner arc side and the second inner arc side to define a continuous arc surface for forming the elbow structure.

Description

Bending die core assembly and manufacturing method of elbow structure

The present invention relates to a mold core assembly and a manufacturing method, in particular to a bent pipe mold core assembly for making a bent pipe structure and a manufacturing method using the bent pipe mold core assembly.

Ordinary hollow plastic elbows are usually made by plastic injection molding technology with forming molds and cores. The above-mentioned mold core is used to shape the internal shape of the plastic elbow, and the core is usually assembled into two structures that can be disassembled and assembled. Therefore, during the injection molding process of the plastic elbow, the two structures can be combined as One piece, and the two sections can be separated to remove from the hollow plastic elbow after the production is completed. In order to prevent the two-section structure of the mold core from damaging the inner wall of the plastic elbow when it is withdrawn from the plastic elbow, the inner edge of the two-section structure of the mold core is usually configured as a linear structure. However, after joining the two structures in this way, a sharp corner will be formed at the bending corner, and the sharp corner will form a sharp structure with complementary angles during the process of shaping the internal structure of the plastic elbow. Since the sharp structure protrudes from the inner wall of the plastic elbow, it will hinder the flow of water and reduce the water pressure, and the sharp structure is the part where the structural stress is concentrated and is more likely to be damaged.

Therefore, one of the objectives of the present invention is to provide an elbow mold core assembly that can solve the aforementioned problems.

Therefore, in some embodiments, the elbow die core assembly of the present invention is suitable for being disposed in a cavity of a forming die, so as to cooperate with the forming die to manufacture an elbow structure. The elbow mold core assembly includes a first mold core, a second mold core and a fillet mold core. The first mold core includes a first long straight section and a first curved arc section which is connected to one end of the first long straight section and does not protrude out of the periphery of the first long straight section. The first curved arc segment has a first outer arc side and a first inner arc side opposite to the first outer arc side and having a shorter extension length. The end of the first curved arc segment away from the first long straight segment has a first embedded slope connecting the first outer arc side and the first inner arc side. The second mold core can be connected with the first mold core, and includes a second long straight section and a second long straight section connected to one end of the second long straight section and not protruding out of the periphery of the second long straight section Arc segment. The second curved arc segment has a second outer arc side and a second inner arc side opposite to the second outer arc side and having a shorter extension length. The end of the second curved arc segment away from the second long straight segment has a second embedded slope connecting the second outer arc side and the second inner arc side. The rounded mold core is used for connecting the first mold core and the second mold core, and includes a flat-shaped embedding body with different surfaces capable of abutting against the first embedding inclined surface and the second embedding inclined surface respectively . The embedding body has a straight outer edge and a concave arc outer edge located on opposite sides, and the thickness of the embedding body gradually increases from the straight outer edge to the concave arc outer edge. Wherein, when the first mold core and the second mold core are in close contact, a part of the first inlaid inclined surface is in close contact with the second inlaid inclined surface, and the rounded mold core is embedded in the first mold Between the core and the second mold core, the straight outer edge corresponds to the first outer arc side and the second outer arc side, and the concave arc outer edge corresponds to the first inner arc side and the second inner arc side The combination defines a continuous arc surface capable of shaping the internal topography of the elbow structure.

In some embodiments, the first embedding slope has a first bonding region and a first bonding region connected to each other, the first bonding region corresponds to the first outer arc side, and the first bonding region Corresponding to one side of the first inner arc side and capable of abutting against the embedding body, the inclination of the first embedding area is greater than that of the first bonding area in the extending direction of the first long straight section. The second embedment slope has a second joint area and a second embedment area connected to each other, the second joint area corresponds to the second outer arc side and can abut against the first embedment slope of the first embedment slope a joint area, the second embedment area corresponds to the second inner arc side and can abut against the other side of the embedment body. When the first mold core and the second mold core are in close contact, the first embedding area and the second embedding area are spaced apart from each other to form a space for the embedding body to be embedded therein, and the two The opposite surfaces contact the first embedment area and the second embedment area respectively.

In some embodiments, the first embedding region is recessed to form a groove, and the groove has a positioning post therein. The second embedding region is recessed to form a guide groove. The fillet mold core further includes an extension structure and a guide structure formed on different surfaces of the embedding body. The extension structure extends into the groove and forms a limiter for passing through the positioning post hole, so that the fillet mold core can translate and rotate relative to the first mold core without being separated from the first mold core. The guiding structure protrudes from the embedding body and has a distal end facing the outer edge of the concave arc. The elbow mold core assembly further includes an elastic reset structure, one end of the elastic reset structure is connected to one of the embedding body and the extension structure, and the other end of the elastic reset structure is connected to the groove. When the first mold core and the second mold core gradually close, the guide structure extends into the guide groove and touches the inner wall of the guide groove, and the engaging body is engaged by the first The inclined surface and the second embedding inclined surface are pressed against each other and gradually moved until the straight outer edge is aligned with the junction of the first bonding area and the first embedding area and the second bonding area and the second embedding area junction, and the outer edge of the concave arc is aligned with the first inner arc side and the second inner arc side. When the first mold core and the second mold core are gradually separated, the elastic reset structure drives the rounded mold core to move, so that the embedding body gradually moves away from the first embedding slope and moves toward the first outer arc side , and the guiding structure gradually moves out of the guiding groove.

In some embodiments, the groove further has a shaft column; the elastic restoring structure is a telescopic spring, one end of the telescopic spring is disposed on the shaft column and can rotate with the shaft column as the axis. The other end is arranged on the extension structure.

In some embodiments, the embedding body further has two convex arc outer edges located on opposite sides and connecting the straight outer edge and the concave arc outer edge. When the first mold core and the second mold core are in close contact When the outer edges of the convex arcs are aligned with the peripheries of the first mold core and the second mold core.

Another object of the present invention is to provide a method for manufacturing a bent pipe structure. The manufacturing method is performed in cooperation with a forming mold and an elbow core assembly as described above, and includes the following steps: (A) placing the elbow core assembly in a cavity of the forming mold, and making the first The mold core and the second mold core are gradually approached in a state in which the first embedded bevel and the second embedded bevel are aligned; (B) the first mold core and the second mold core are closely sealed to make the first mold core and the second mold core close together. A part of an inlaid inclined surface is abutted against the second inlaid inclined surface, and the rounded mold core is embedded between the first mold core and the second mold core, so that the straight outer edge corresponds to The first outer arc side and the second outer arc side, and the outer edge of the concave arc cooperates with the first inner arc side and the second inner arc side to define a continuous shape that can shape the inner shape of the elbow structure arc surface; (C) pouring molding material into the mold cavity, and the inner and outer appearance of the elbow structure are jointly formed by the inner wall surface of the mold cavity and the outer surface of the elbow mold core assembly; and (D) the The first mold core and the rounded mold core are moved out of the elbow structure along the extension direction of the first long straight section, and the second mold core is moved out of the elbow structure along the extension direction of the second long straight section.

The present invention has at least the following effects: through the setting of the rounded mold core, the first mold core, the second mold core and the rounded mold core can be joined to produce a curved pipe structure with a complete arc shape , especially the elbow structure will not form a sharp structure on the part of the first inner arc side, the second inner arc side and the outer edge of the concave arc, so it can avoid the influence on the fluid pressure, and also help to improve the Structural strength of elbow structures.

Referring to FIGS. 1 , 6 and 10 , the bending die core assembly 100 of the present invention is suitable for being disposed in a cavity 201 of a forming die 200 as shown in FIGS. 6 and 10 to cooperate with the forming die 200 to produce a curved Tube structure 300 . It should be noted that, in the three-dimensional views disclosed in FIGS. 6 , 8 and 10 , the forming die 200 is shown in a cut-half form, and only the lower half is drawn to facilitate the inspection of the relative relationship between the structures.

Referring to FIG. 1 to FIG. 5 , the elbow mold core assembly 100 includes a first mold core 1 , a second mold core 2 , a rounded mold core 3 and an elastic reset structure 4 . The first mold core 1 , the second mold core 2 and the fillet mold core 3 may be in a separated state as shown in FIG. 1 , or may be implemented in a joined state when manufacturing the elbow structure 300 as shown in FIG. 3 .

The first mold core 1 is generally cylindrical, and includes a first long straight section 11 and a first straight section 11 connected to one end of the first long straight section 11 and not protruding out of the periphery of the first long straight section 11 Curved arc segment 12. Although the first curved section 12 has a curved shape, it does not protrude from the periphery of the first long straight section 11. Therefore, after the curved pipe structure 300 is fabricated as shown in FIG. 11, the first mold core 1. When moving out of the elbow structure 300 along the extension direction of the first long straight section 11 (the left-right direction in FIG. 11 ), the first curved arc section 12 will not contact the internal structure of the elbow structure 300 to avoid Damage is caused to the internal structure of the elbow structure 300 . The first curved arc segment 12 has a first outer arc side 121 and a first inner arc side 122 located on the opposite side of the first outer arc side 121 and having a shorter extension length. An end of the first curved segment 12 away from the first long straight segment 11 has a first engaging slope 123 connecting the first outer arc side 121 and the first inner arc side 122 . The contour of the first embedding slope 123 is elliptical, and has a first bonding area 124 and a first embedding area 125 which are connected to each other. The first engagement area 124 corresponds to the first outer arc side 121 , and the first engagement area 125 corresponds to the first inner arc side 122 and can abut against one side of the rounded mold core 3 . In the extending direction of the first long straight section 11 , the inclination of the first embedding region 125 is greater than that of the first bonding region 124 . The first embedding area 125 is recessed to form a groove 126, the groove 126 extends along the extending direction of the first long straight section 11, and as shown in FIG. The post 127 and the shaft post 128 are respectively used for the rounded mold core 3 and the elastic reset structure 4 to be pivoted thereon.

The second mold core 2 is generally cylindrical and can be connected with the first mold core 1 , and includes a second long straight section 21 and an end connected to the second long straight section 21 and not protruding from the second straight section 21 The second curved arc segment 22 outside the circumference of the long straight segment 21 . The second arc segment 22 has a second outer arc side 221 and a second inner arc side 222 that is opposite to the second outer arc side 221 and has a shorter extension length. The second arc segment 22 is far from The end of the second long straight section 21 has a second engaging slope 223 connecting the second outer arc side 221 and the second inner arc side 222 . The second engaging slope 223 has a second engaging area 224 and a second engaging area 225 connected to each other. The second engaging area 224 corresponds to the second outer arc side 221 and can abut against the first engaging area. The first engaging area 124 and the second engaging area 225 of the inclined surface 123 correspond to the second inner arc side 222 and can abut against the other side of the rounded mold core 3 . In the extending direction of the second long straight section 21 , the inclination of the second embedding region 225 is greater than that of the second bonding region 224 . The second embedment area 225 is recessed to form a guide groove for guiding the movement of the fillet core 3 .

The rounded mold core 3 is used for connecting the first mold core 1 and the second mold core 2, and includes a flat shape with different surfaces capable of contacting the first embedding area 125 and the second embedding area respectively 225 of the embedded body 31 , and an extension structure 32 and a guide structure 33 formed on different sides of the embedded body 31 . The embedding body 31 has a straight outer edge 311 and a concave arc outer edge 312 located on opposite sides, and two convex arc outer edges located on opposite sides and connecting the straight outer edge 311 and the concave arc outer edge 312 313. In this embodiment, the thickness of the embedded body 31 is gradually thicker from the straight outer edge 311 to the concave arc outer edge 312 , the straight outer edge 311 is linear, and the concave arc outer edge 312 is a concave arc The outer edges 313 of the convex arcs are in the shape of arcs protruding toward the opposite side. With the above-mentioned configuration, the embedding body 31 can be completely matched with the outer contours of the first embedding area 125 and the second embedding area 225 , so that the rounded mold core 3 and the first mold core 1 can be completely matched. After being joined with the second mold core 2 , a complete circular arc elbow shape can be formed. The extension structure 32 extends into the groove 126 and forms a limiting hole 321 for passing through the positioning post 127 , so that the rounded mold core 3 can translate and rotate relative to the first mold core 1 However, it is not separated from the first mold core 1, and will move with the first mold core 1 when it moves. The guiding structure 33 protrudes from the embedding body 31 and has an end facing the outer edge of the concave arc 312 , and penetrates into the guiding groove 226 when the second mold core 2 is joined to the rounded mold core 3 . and push against the inner wall of the guide groove 226 , so that the second mold core 2 and the rounded mold core 3 can gradually approach to a predetermined position when the guide groove 226 slides along the inner wall of the guide groove 226 And smoothly fit. One end of the elastic restoring structure 4 is connected to one of the embedding body 31 and the extension structure 32 , and the other end of the elastic restoring structure 4 is connected to the groove 126 . Specifically, in this embodiment, the elastic reset structure 4 is a telescopic spring. One end of the telescopic spring is disposed on the shaft column 128 and can rotate around the shaft column 128 , and the other end of the telescopic spring is disposed on the shaft column 128 . Extension structure 32 . When the rounded mold core 3 is not pressed against, the elastic force of the elastic reset structure 4 will maintain the rounded mold core 3 in a position closer to the first outer arc side 121 and between the first outer arc side 121 as a whole as shown in FIG. 1 . A position between the outer arc side 121 and the first inner arc side 122, and after the elbow structure 300 is formed as shown in FIG. The inner structure of the elbow structure 300 is not touched outside the pipe structure 300 , so as to avoid damage to the elbow structure 300 .

Referring to FIG. 1 , FIG. 6 to FIG. 11 , the following describes a method of manufacturing the elbow structure 300 by using the elbow core assembly 100 to cooperate with the forming mold 200 .

First, as shown in FIG. 6 and FIG. 7 , the elbow mold core assembly 100 can be placed in the cavity 201 of the forming mold 200 , and the first mold core 1 and the second mold core 2 can be formed with the first The aligned state of an inlaid inclined surface 123 and the second inlaid inclined surface 223 is gradually approached. When the first mold core 1 and the second mold core 2 are gradually in close contact, the guide structure 33 of the rounded mold core 3 will protrude into the guide groove 226 of the second mold core 2 and abut against The inner wall of the guide groove 226 and the engaging body 31 will be pressed by the first engaging slope 123 and the second engaging slope 223 to move gradually until the straight outer edge 311 is aligned with the first engaging surface The junction of the bonding area 124 and the first embedding area 125 and the junction of the second bonding area 224 and the second embedding area 225, and the concave arc outer edge 312 is aligned with the first inner arc side 122 and The second inner arc side 222 is in the state shown in FIGS. 8 and 9 . When the first mold core 1 and the second mold core 2 are completely in contact with each other, a part of the first inlaid inclined surface 123 abuts against the second inlaid inclined surface 223 (that is, the first joint area 124 abuts against the second inlaid inclined surface 223 ). The second bonding area 224), the first bonding area 125 and the second bonding area 225 are spaced apart from each other due to the inclination of the first bonding area 124 and the second bonding area 224, forming a space for the bonding area. The space in which the connecting body 31 is embedded, and the two opposite sides of the connecting body 31 abut against the first embedding area 125 and the second embedding area 225 respectively, so that the rounded mold core 3 is completely embedded in the Between the first mold core 1 and the second mold core 2, and the straight outer edge 311 corresponds to the side of the first outer arc side 121 and the second outer arc side 221, the convex arc outer edges 313 The side edges of the first embedding area 125 and the second embedding area 225 are aligned, and the outer edge 312 of the concave arc cooperates with the first inner arc side 122 and the second inner arc side 222 to define a shapeable A continuous arc surface of the internal topography of the elbow structure 300 . At this time, the first mold core 1 , the second mold core 2 and the rounded mold core 3 are completely adhered to form a bent cylindrical structure. A bent cylinder is used as an example, but the angle configuration of the first curved arc segment 12 and the second curved arc segment 22 can be adjusted as required, so that the joined overall structure presents a bent cylindrical structure greater than or less than 90 degrees.

Then, as shown in FIG. 10 and FIG. 11 , a molding material can be poured into the cavity 201 , and the inner and outer surfaces of the elbow structure 300 are jointly formed by the inner wall surface of the cavity 201 and the outer surface of the elbow core assembly 100 . The shape, specifically, the first long straight section 11 and the second long straight section 21 shape the internal shapes of the two long straight sections 301 of the curved tube structure 300, and the first long straight section The arc segment 12 , the embedded main body 31 , and the second curved arc segment 22 together form the internal appearance of the curved pipe curved segment 302 of the curved pipe structure 300 . After the elbow structure 300 is formed, the first mold core 1 and the rounded mold core 3 can be moved out of the elbow structure 300 along the extending direction of the first long straight section 11 , and the second mold core can be 2. Move out of the elbow structure 300 along the extending direction of the second long straight section 21 . In the above process, when the first mold core 1 and the second mold core 2 are gradually separated, the elastic reset structure 4 will drive the rounded mold core 3 to move, so that the embedding body 31 is gradually moved away from the first embedding Connect to the inclined surface 123 and move toward the first outer arc side 121 , and the guide structure 33 gradually moves out of the guide groove 226 , so that the rounded mold core 3 will not protrude from the first long straight section 11 . Therefore, the inner structure of the elbow structure 300 is not touched, so as to avoid damage. In particular, the concave arc outer edge 312 of the rounded mold core 3 can protrude from the first long straight line due to its arc shape when the rounded mold core 3 is joined to the first mold core 1 . Outside the circumference of the section 11, the part of the elbow structure 300 corresponding to the outer edge 312 of the concave arc is shaped into a circular arc, so as to avoid the inner wall surface of the elbow structure 300 from forming a sharp structure, but due to the rounded corners When the mold core 3 is not pressed by the second mold core 2, it can move in the direction of the first outer arc side 121 under the driving of the elastic reset structure 4, so that the outer edge 312 of the concave arc can be transformed into a non-circular arc. In the state of protruding outside the peripheral edge of the first long straight section 11 , the concave arc outer edge 312 will not cause damage to the inside of the elbow structure 300 when moving. Finally, after the first mold core 1, the second mold core 2 and the fillet mold core 3 are all removed from the elbow structure 300, the elbow structure 300 can be taken out from the mold cavity 201, to complete the overall production process.

To sum up the above description, the elbow mold core assembly 100 of the present invention can make the first mold core 1 , the second mold core 2 and the rounded mold core 3 after joining together to produce a The curved pipe structure 300 with a complete circular arc shape, especially the parts of the curved pipe structure 300 corresponding to the first inner arc side 122 , the second inner arc side 222 and the concave arc outer edge 312 will not form a sharp structure, Therefore, the influence on the water pressure can be avoided, and the structural strength of the elbow structure 300 can also be improved. In addition, under the traction of the elastic reset structure 4, the rounded mold core 3 can be maintained in a state that does not protrude from the periphery of the first long straight section 11 when no force is applied, so it can be avoided The elbow structure 300 is damaged, which is beneficial to improve the manufacturing yield. Therefore, the pipe bend mold core assembly 100 of the present invention and the manufacturing method of using the pipe bend mold core assembly 100 to manufacture the pipe bend structure 300 can indeed achieve the purpose of the present invention.

However, the above are only examples of the present invention, and should not limit the scope of the present invention. Any simple equivalent changes and modifications made according to the scope of the application for patent of the present invention and the content of the patent specification are still within the scope of the present invention. within the scope of the invention patent.

100: Bend tube core assembly 200: Forming Die 201: Mould cavity 300: Elbow structure 301: Long straight section of elbow 302: Bend arc section of elbow 1: The first core 11: The first long straight section 12: The first arc segment 121: First outer arc side 122: First inner arc side 123: The first inlaid bevel 124: First junction area 125: First Embedding Region 126: Groove 127: Positioning post 128: Axle column 2: The second core 21: The second longest straight section 22: The second arc segment 221: Second outer arc side 222: Second inner arc side 223: Second inlay bevel 224: Second junction area 225: Second Embedding Region 226: Guide slot 3: fillet core 31: Embedded body 311: Straight outer edge 312: Outer edge of concave arc 313: Outer edge of convex arc 32: Extended structure 321: Shaft hole 33: Guide structure 4: Elastic reset structure

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: FIG. 1 is a top exploded view illustrating one embodiment of the elbow core assembly of the present invention; Fig. 2 is the top combined view of this elbow mold core assembly; 3 is a perspective view illustrating an embodiment of the first core of the elbow core assembly; 4 is a perspective view illustrating an embodiment of the second core of the elbow core assembly; 5 is a perspective view illustrating an embodiment of a fillet core of the elbow core assembly; 6 is a fragmentary perspective view illustrating an embodiment of the elbow core assembly placed in a cavity of a forming die prior to joining; Fig. 7 is a sectional view along line VII-VII of Fig. 6; Fig. 8 is a view similar to Fig. 6, illustrating the state of the elbow mandrel assembly after engagement; Fig. 9 is a sectional view along line IX-IX of Fig. 8; FIG. 10 is a view similar to FIG. 6 and FIG. 8 , illustrating an embodiment of the elbow core assembly and the forming die to cooperate to make a elbow structure; and FIG. 11 is a cross-sectional view taken along line XI-XI of FIG. 10 .

100: Bend tube core assembly

1: The first core

11: The first long straight section

12: The first arc segment

121: First outer arc side

122: First inner arc side

123: The first inlaid bevel

126: Groove

2: The second core

21: The second longest straight section

22: The second arc segment

221: Second outer arc side

222: Second inner arc side

223: Second inlay bevel

226: Guide slot

3: fillet core

31: Embedded body

312: Outer edge of concave arc

32: Extended structure

33: Guide structure

4: Elastic reset structure

Claims (5)

An elbow mold core assembly is suitable for being arranged in a cavity of a forming mold to cooperate with the forming mold to make a bent pipe structure. The elbow mold core assembly comprises: a first mold core, including a first A long straight section and a first curved arc section connected to one end of the first long straight section and not protruding outside the periphery of the first long straight section, the first curved arc section has a first outer arc side and a The first inner arc side is located on the opposite side and has a shorter extension length from the first outer arc side, and the end of the first curved arc segment away from the first long straight segment has a connection connecting the first outer arc side and the first arc side. A first inserting inclined surface on the inner arc side; a second mold core, which can be connected with the first mold core, and includes a second long straight section and an end connected to the second long straight section and not protruding from the second long straight section A second curved arc section outside the periphery of the second long straight section, the second curved arc section has a second outer arc side and a second inner arc side opposite to the second outer arc side and having a shorter extension length On the arc side, the end of the second curved arc segment away from the second long straight segment has a second embedded slope connecting the second outer arc side and the second inner arc side; and a rounded mold core for connecting The first mold core and the second mold core include a flat-shaped embedding body with different surfaces capable of abutting against the first embedding inclined surface and the second embedding inclined surface, respectively, and the embedding body has oppositely located A straight outer edge and a concave arc outer edge on the side, and two convex arc outer edges located on opposite sides and connecting the straight outer edge and the concave arc outer edge, the thickness of the embedded body is from the straight outer edge It gradually thickens from the edge to the outer edge of the concave arc, wherein, when the first mold core and the second mold core are in close contact, a part of the first inlaid inclined surface is in close contact with the second inlaid inclined surface, and the circular The corner mold core is embedded between the first mold core and the second mold core, the straight outer edge corresponds to the first outer arc side and the second outer arc side, and the convex arc outer edges are aligned with the The peripheral edge of the first mold core and the second mold core, the outer edge of the concave arc cooperates with the first inner arc side and the second inner arc side to define an interior that can shape the elbow structure The continuous arc of the morphology. The elbow mold core assembly according to claim 1, wherein the first engaging slope has a first engaging area and a first engaging area connected to each other, and the first engaging area corresponds to the first outer arc side, the first embedment area corresponds to the first inner arc side and can touch one side of the embedment body, and the inclination of the first embedment area in the extending direction of the first long straight section is greater than the inclination of the first embedment area a first engaging area; the second engaging slope has a second engaging area and a second engaging area connected to each other, the second engaging area corresponds to the second outer arc side and can abut against the first engaging area The first bonding area of the inclined surface, the second embedding area is corresponding to the second inner arc side and can touch the other side of the embedding body; when the first mold core and the second mold core are in close contact, the The first embedding area and the second embedding area are spaced apart from each other to form a space for the embedding body to be embedded therein, and two opposite surfaces of the embedding body contact the first embedding area and the second embedding area respectively access area. The elbow mold core assembly according to claim 2, wherein the first embedment area is recessed to form a groove, and the groove has a positioning post; the second embedment area is recessed to form a guide groove; the The fillet mold core also includes an extension structure and a guide structure formed on different surfaces of the embedding body. The extension structure extends into the groove and forms a limit hole for passing through the positioning post , so that the rounded mold core can be translated and rotated relative to the first mold core without being separated from the first mold core, the guide structure protrudes from the embedded main body and the end faces the outer edge of the concave arc; the bending The die core assembly further includes an elastic reset structure, one end of the elastic reset structure is connected to one of the embedding body and the extension structure, and the other end of the elastic reset structure is connected to the groove; when the first When the mold core and the second mold core are gradually closed, the guide structure extends into the guide groove and touches the inner wall of the guide groove, and the embedded main body is affected by the first embedded inclined surface and the first embedded inclined surface. The two embedment slopes press against each other and move gradually until the straight outer edge aligns with the junction of the first joint area and the first embedment area and the second joint The junction of the joint area and the second embedment area, and the outer edge of the concave arc is aligned with the first inner arc side and the second inner arc side; when the first mold core and the second mold core are gradually separated , the elastic reset structure drives the fillet mold core to move, so that the embedding body gradually moves away from the first embedding slope and moves toward the first outer arc side, and the guiding structure gradually moves out of the guiding groove. The elbow mold core assembly according to claim 3, wherein the groove further has a shaft column; the elastic return structure is a telescopic spring, one end of the telescopic spring is disposed on the shaft column and can be used as the shaft column. The axis rotates, and the other end of the telescopic spring is arranged on the extension structure. A method for manufacturing an elbow structure, which is performed by a forming mold and an elbow core assembly as claimed in claim 1, the manufacturing method comprising the following steps: (A) placing the elbow core assembly in the forming In a cavity of the mold, the first mold core and the second mold core are gradually approached in a state in which the first embedded inclined surface and the second embedded inclined surface are aligned; (B) the first mold core and the second mold core closely to make a part of the first embedded inclined surface abut against the second embedded inclined surface, and let the rounded mold core be embedded in the first mold core and the second mold Between the cores, the straight outer edge corresponds to the first outer arc side and the second outer arc side, the convex arc outer edges are aligned with the peripheries of the first mold core and the second mold core, and the The outer edge of the concave arc cooperates with the first inner arc side and the second inner arc side to define a continuous arc surface capable of shaping the internal shape of the elbow structure; (C) pouring molding material into the mold cavity, The inner and outer appearance of the elbow structure is jointly formed by the inner wall surface of the cavity and the outer surface of the elbow core assembly; and (D) the first core together with the fillet core along the first length The extension direction of the straight section is moved out of the elbow structure, and the second mold core is moved out of the elbow structure along the extension direction of the second long straight section.

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