Extrusion forming die for metal bar

Abstract

The utility model discloses an extrusion forming die for a metal bar. The extrusion forming die comprises a die main body and a channel penetrating through the die main body, the channel sequentially comprises a first extrusion cavity and a second extrusion cavity in the penetrating direction of the channel, the center line of the second extrusion cavity and the center line of the first extrusion cavity are flush or coincide, and the cavity diameter of the second extrusion cavity is further smaller than that of the first extrusion cavity. The channel further comprises an inclined transition cavity located between the first extrusion cavity and the second extrusion cavity, and the center line of the inclined transition cavity coincides with the center line of the second extrusion cavity. The first tail end of the inclined transition cavity is jointed with the second extrusion cavity, and the cavity diameter of the first tail end is the same as that of the second extrusion cavity; the second tail end opposite to the inclined transition cavity is connected with the first extrusion cavity, and the cavity diameter of the second tail end is smaller than that of the first extrusion cavity. The extrusion forming die for the metal bar can prevent the surface of the metal bar from being scratched, so that the quality of the surface of the metal bar is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of extruding metal ingots into metal rods, and particularly relates to an extrusion molding die for metal rods for extruding high-purity magnesium ingots into high-purity magnesium rods. Background Art

[0002] As is well known, medical high-purity magnesium rods belong to one of the metal rods, and they are generally made by extrusion molding of high-purity magnesium ingots.

[0003] Among them, in the process of preparing medical high-purity magnesium rods, due to the extremely high requirements for the appearance and corresponding mechanical properties of the magnesium rods, especially the surface finish does not allow defects such as pitting, wire drawing, and breakage. However, the existing extrusion dies cannot well meet the surface requirements of the magnesium rods due to design defects. The reason is that the transition port in the existing extrusion die is too sharp, resulting in scratching the surface of the magnesium rod during the process of extruding the magnesium ingot into the magnesium rod, thereby affecting the surface quality of the magnesium rod.

[0004] Therefore, there is an urgent need for an extrusion molding die for metal rods to overcome the above defects. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an extrusion molding die for metal rods to prevent the surface of the metal rod from being scratched and improve the surface quality of the metal rod.

[0006] To achieve the above purpose, the extrusion molding die for metal rods of the utility model includes a die body and a channel passing through the die body. The channel sequentially includes a first extrusion cavity and a second extrusion cavity along its penetrating direction. The centerlines of the second extrusion cavity and the first extrusion cavity are flush or coincident, and the cavity diameter of the second extrusion cavity is smaller than that of the first extrusion cavity. Among them, the channel also includes an inclined transition cavity located between the first extrusion cavity and the second extrusion cavity. The centerline of the inclined transition cavity coincides with the centerline of the second extrusion cavity; the first end of the inclined transition cavity is joined to the second extrusion cavity, and the cavity diameter of the first end is the same as that of the second extrusion cavity; the second end opposite to the inclined transition cavity is joined to the first extrusion cavity, and the cavity diameter of the second end is smaller than that of the first extrusion cavity.

[0007] Compared with the prior art, by means of the design that "the channel further includes an inclined transition cavity located between the first extrusion cavity and the second extrusion cavity, the center line of the inclined transition cavity coincides with the center line of the second extrusion cavity; the first end of the inclined transition cavity is joined to the second extrusion cavity, and the cavity diameter at the first end is the same as the cavity diameter of the second extrusion cavity; the opposite second end of the inclined transition cavity is joined to the first extrusion cavity, and the cavity diameter at the second end is smaller than the cavity diameter of the first extrusion cavity", no sharp edge is generated at the joint of the first end of the inclined transition cavity and the second extrusion cavity; and since the second extrusion cavity is used to control the surface quality of the metal rod, the joint of the first end of the inclined transition cavity and the second extrusion cavity will not scratch the surface of the metal rod, thereby improving the surface quality of the metal rod to meet the needs of customers. Additionally, by means of the inclined transition cavity, after the metal ingot is extruded into the first extrusion cavity, it can enter the second extrusion cavity more smoothly along the inclined transition cavity.

[0008] Preferably, the intersection of the cavity end wall surface of the first extrusion cavity and the cavity side wall surface of the inclined transition cavity is a closed-loop arc transition surface.

[0009] Preferably, the slope of the inclined transition cavity relative to its center line is 5 to 10 degrees.

[0010] Preferably, the slope is 5 degrees, 6 degrees, 7 degrees, 8 degrees, 9 degrees or 10 degrees.

[0011] Preferably, the channel further sequentially includes a first through cavity and a second through cavity along its penetrating direction, the center lines of the first through cavity, the second through cavity and the second extrusion cavity coincide, the cavity diameter of the first through cavity is larger than the cavity diameter of the second extrusion cavity, and the cavity diameter of the second through cavity is larger than the cavity diameter of the first through cavity.

[0012] Preferably, the intersection of the cavity end wall surface of the first through cavity and the cavity side wall surface of the second extrusion cavity is a closed-loop arc transition surface; the intersection of the cavity end wall surface of the second through cavity and the cavity side wall surface of the first through cavity is a closed-loop arc transition surface.

[0013] Preferably, the first extrusion cavity, the second extrusion cavity, the first through cavity and the second through cavity are cavities in the shape of a regular prism or a cylinder. Correspondingly, the inclined transition cavity is a cavity in the shape of a regular frustum or a frustum of a cone.

[0014] Preferably, the mold body includes a first mold body and a second mold body assembled together along the penetrating direction of the channel. The first extrusion cavity is located on the first mold body and penetrates through the first mold body, and the inclined transition cavity and the second extrusion cavity are located on the second mold body.

[0015] Preferably, the mold body further includes positioning pins which are inserted into the first mold body and the second mold body along the penetrating direction of the channel.

[0016] Preferably, the first mold body and the second mold body are each provided with an insertion groove, and the positioning pin is inserted into the insertion groove. Description of the Drawings

[0017] Figure 1 is a perspective view of the extrusion molding die for metal rods of the present utility model.

[0018] Figure 2 is Figure 1 the exploded perspective view of the extrusion molding die for metal rods shown in

[0019] Figure 3 is Figure 1 the plan view of the extrusion molding die for metal rods shown in the direction indicated by arrow A.

[0020] Figure 4 is along Figure 3 the internal view taken along the section line B-B in

[0021] Figure 5 is Figure 4 the internal view which also shows each cavity diameter on the basis of

[0022] Figure 6 is on the basis of Figure 4 the internal view which also shows the metal rod on the basis of

[0023] Figure 7 is along Figure 3 the internal view taken along the section line C-C in

[0024] Figure 8 is Figure 6 the perspective view of the metal rod in Detailed Description of the Preferred Embodiments

[0025] Now, embodiments of the present utility model will be described with reference to the drawings, in which like reference numerals represent like elements.

[0026] Please refer to Figures 1 to 5 , the extrusion molding die 100 for metal rods of the present utility model includes a mold body 10 and a channel 20 penetrating the mold body 10. The channel 20 sequentially includes a first extrusion cavity 21 and a second extrusion cavity 22 along its penetrating direction (as indicated by arrow A), and the center lines of the second extrusion cavity 22 and the first extrusion cavity 21 coincide, and the state is shown in Figure 4 and Figure 5As shown by the center line in [reference], it meets the requirement that the center lines of the first part 210 formed by extruding the metal rod 200 by the first extrusion cavity 21 and the second part 220 formed by extruding the metal rod 200 by the second extrusion cavity 22 coincide; obviously, according to actual needs, the center lines of the second extrusion cavity 22 and the first extrusion cavity 21 can also be made parallel to each other, so it is not limited by Figure 4 and Figure 5 as shown.

[0027] At the same time, the cavity diameter D2 of the second extrusion cavity 22 is also smaller than the cavity diameter D1 of the first extrusion cavity 21, so that the size of the first part 210 formed by extruding the metal rod 200 by the first extrusion cavity 21 is larger than the size of the second part 220 formed by extruding the metal rod 200 by the second extrusion cavity 22. Among them, the channel 20 also includes an inclined transition cavity 23 located between the first extrusion cavity 21 and the second extrusion cavity 22. The center line of the inclined transition cavity 23 coincides with the center line of the second extrusion cavity 22. The state is shown in Figure 4 and Figure 5 as shown by the center line in [reference], to meet the requirement that the center lines of the second part 220 formed by extruding the metal rod 200 by the second extrusion cavity 22 and the third part 230 formed by extruding the metal rod 200 by the inclined transition cavity 23 coincide; the first end 231 of the inclined transition cavity 23 is joined to the second extrusion cavity 22. The cavity diameter D3 of the first end 231 of the inclined transition cavity 23 is the same as the cavity diameter D2 of the second extrusion cavity 22 to prevent sharp edges from being generated at the joint of the first end 231 of the inclined transition cavity 23 and the second extrusion cavity 22; the opposite second end 232 of the inclined transition cavity 23 is joined to the first extrusion cavity 21. The cavity diameter D3' of the second end 232 of the inclined transition cavity 23 is smaller than the cavity diameter D1 of the first extrusion cavity 21. The state is shown in Figure 5 as shown. Specifically, in Figure 4 , Figure 6 and Figure 7 as an example, the intersection of the cavity end wall surface 211 of the first extrusion cavity 21 and the cavity side wall surface 233 of the inclined transition cavity 23 is a closed-loop arc transition surface 24. By means of the arc transition surface 24, sharp edges at the intersection of the first extrusion cavity 21 and the inclined transition cavity 23 can be further prevented, so that the surface quality of the second part 220 formed by extruding the metal rod 200 by the second extrusion cavity 22 can be further improved. More specifically, as follows:

[0028] As Figure 4 shown, as an example, the slope α of the inclined transition cavity 23 relative to its center line is 5 to 10 degrees. For example, the slope α is 5 degrees, 6 degrees, 7 degrees, 8 degrees, 9 degrees or 10 degrees; such a design can more effectively improve the surface quality of the second part 220 controlled by the second extrusion cavity 22 of the metal rod 200.

[0029] As Figures 4 to 7 shown, as an example, the channel 20 further sequentially includes a first through cavity 25 and a second through cavity 26 along its through direction. The centerlines of the first through cavity 25, the second through cavity 26, and the second extrusion cavity 22 coincide; the cavity diameter D4 of the first through cavity 25 is greater than the cavity diameter D2 of the second extrusion cavity 22, and the cavity diameter D5 of the second through cavity 26 is greater than the cavity diameter D4 of the first through cavity 25. Such a design facilitates the need for the second part 220 controlled by the second extrusion cavity 22 of the metal rod 200 to continue to extend out of the mold body 10 along the through direction, so as to better meet the need for the second extrusion cavity 22 to continue to extrude and form the second part 220 of the blank entering along the inclined transition cavity 23 into the metal rod 200. Specifically, in Figure 4 , Figure 6 and Figure 7 , as an example, the intersection of the cavity end wall surface 251 of the first through cavity 25 and the cavity side wall surface 221 of the second extrusion cavity 22 is a closed-loop arc transition surface 27; the intersection of the cavity end wall surface 261 of the second through cavity 26 and the cavity side wall surface 252 of the first through cavity 25 is a closed-loop arc transition surface 28, so as to facilitate the operation of removing the metal rod 200 from the mold body 20 along the direction opposite to the through direction by means of the arc transition surface 27(28), thereby more effectively preventing the surface of the second part 220 of the metal rod 200 from being scratched by the cavity end wall surface 251 of the first through cavity 25 and the cavity end wall surface 261 of the second through cavity 26 during the removal process. In addition, the first extrusion cavity 21, the second extrusion cavity 22, the first through cavity 25, and the second through cavity 26 are cylindrical cavities. Correspondingly, the inclined transition cavity 23 is a frustum-shaped cavity, so as to facilitate the turning processing of the channel 20 on the mold body 10; obviously, according to actual needs, the first extrusion cavity 21, the second extrusion cavity 22, the first through cavity 25, and the second through cavity 26 can also be regular prismatic cavities. Correspondingly, the inclined transition cavity 23 is a regular frustum-shaped cavity, so it is not limited to this.

[0030] As Figures 1 to 2 , and Figures 4 to 7 shown, as an example, the mold body 10 includes a first mold body 11 and a second mold body 12 assembled together along the through direction of the channel 20. The first extrusion cavity 21 is located on the first mold body 11, and the first extrusion cavity 21 also penetrates through the first mold body 11. The inclined transition cavity 23 and the second extrusion cavity 22 are located on the second mold body 12; such a design enables the first extrusion cavity 21 to be machined separately from the inclined transition cavity 23 and the second extrusion cavity 22, thereby improving the machining accuracy of the first extrusion cavity 21, the inclined transition cavity 23, and the second extrusion cavity 22 respectively. Specifically, in Figure 2 and Figure 7Among them, as an example, the mold body 10 further includes a positioning pin 13. The positioning pin 13 is inserted into the first mold body 11 and the second mold body 12 along the penetrating direction of the channel 20. Such a design facilitates the assembly operation between the first mold body 11 and the second mold body 12. More specifically, in Figure 7 Among them, as an example, each of the first mold body 11 and the second mold body 12 is provided with an insertion groove 111(121). The positioning pin 13 is inserted into the insertion groove 111(121) to facilitate the installation and disassembly operations of the positioning pin 13 with the first mold body 11 and the second mold body 12 respectively.

[0031] Compared with the prior art, by virtue of "the channel 20 further includes an inclined transition cavity 23 located between the first extrusion cavity 21 and the second extrusion cavity 22. The center line of the inclined transition cavity 23 coincides with the center line of the second extrusion cavity 22. The coincidence line is shown in Figure 4 and Figure 5 the center line shown in; the first end 231 of the inclined transition cavity 23 is joined to the second extrusion cavity 22, and the cavity diameter D3 of the first end 231 of the inclined transition cavity 23 is the same as the cavity diameter D2 of the second extrusion cavity 22; the opposite second end 232 of the inclined transition cavity 23 is joined to the first extrusion cavity 21, and the cavity diameter D3` of the second end 232 of the inclined transition cavity 23 is smaller than the cavity diameter D1 of the first extrusion cavity 21", such a design makes no sharp edges generated at the joint of the first end 231 of the inclined transition cavity 23 and the second extrusion cavity 22; and since the second extrusion cavity 22 is used to control the surface quality of the metal rod 200, the joint of the first end 231 of the inclined transition cavity 23 and the second extrusion cavity 22 will not scratch the surface of the metal rod 200, thereby improving the surface quality of the metal rod 200 to meet the needs of customers. In addition, by virtue of the inclined transition cavity 23, after the metal ingot is squeezed into the first extrusion cavity 21, it can more smoothly enter the second extrusion cavity 22 along the inclined transition cavity 23.

[0032] It should be noted that when the mold body 10 includes the first mold body 11 and the second mold body 12, and the channel 20 further includes a first through cavity 25 and a second through cavity 26, at this time, the first through cavity 25 and the second through cavity 26 are located at the second mold body 12; obviously, according to actual needs, the first through cavity 25 and the second through cavity 26 can be deleted, so it is not limited by Figures 4 to 7 shown.

[0033] What is disclosed above is only the preferred embodiment of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Therefore, the equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. An extrusion molding die for a metal rod, comprising a die body and a channel passing through the die body. The channel sequentially includes a first extrusion cavity and a second extrusion cavity along its penetrating direction. The center lines of the second extrusion cavity and the first extrusion cavity are flush or coincident, and the cavity diameter of the second extrusion cavity is smaller than that of the first extrusion cavity. It is characterized in that The channel further includes an inclined transition cavity located between the first extrusion cavity and the second extrusion cavity, and the center line of the inclined transition cavity coincides with the center line of the second extrusion cavity; the first end of the inclined transition cavity is joined to the second extrusion cavity, and the cavity diameter of the first end is the same as that of the second extrusion cavity; the opposite second end of the inclined transition cavity is joined to the first extrusion cavity, and the cavity diameter of the second end is smaller than that of the first extrusion cavity.

2. The extrusion molding die for a metal rod according to claim 1, characterized in that, The intersection of the cavity end wall surface of the first extrusion cavity and the cavity side wall surface of the inclined transition cavity is a closed-loop arc transition surface.

3. The extrusion molding die for a metal rod according to claim 1, characterized in that, The slope of the inclined transition cavity relative to its center line is 5 to 10 degrees.

4. The extrusion molding die for a metal bar according to claim 3, wherein The slope is 5 degrees, 6 degrees, 7 degrees, 8 degrees, 9 degrees or 10 degrees.

5. The extrusion forming die for a metal rod according to claim 1, wherein, The channel further sequentially includes a first passage cavity and a second passage cavity along its through direction, the center lines of the first passage cavity, the second passage cavity and the second extrusion cavity coincide, the cavity diameter of the first passage cavity is larger than that of the second extrusion cavity, and the cavity diameter of the second passage cavity is larger than that of the first passage cavity.

6. The extrusion molding die for a metal rod according to claim 5, characterized in that, The intersection of the cavity end wall surface of the first passage cavity and the cavity side wall surface of the second extrusion cavity is a closed-loop arc transition surface; the intersection of the cavity end wall surface of the second passage cavity and the cavity side wall surface of the first passage cavity is a closed-loop arc transition surface.

7. The extrusion forming die for a metal rod according to claim 5, characterized in that, The first extrusion cavity, the second extrusion cavity, the first passage cavity and the second passage cavity are regular prism-shaped or cylindrical cavities, and correspondingly, the inclined transition cavity is a regular frustum-shaped or frustum of a cone-shaped cavity.

8. The extrusion molding die for a metal rod according to claim 1, characterized in that, The mold body includes a first mold body and a second mold body assembled together along the through direction of the channel, the first extrusion cavity is located on the first mold body and penetrates through the first mold body, and the inclined transition cavity and the second extrusion cavity are located on the second mold body.

9. The extrusion molding die for a metal rod according to claim 8, wherein, The mold body further includes positioning pins inserted into the first mold body and the second mold body along the through direction of the channel.

10. The extrusion molding die for a metal rod according to claim 9, characterized in that, Each of the first mold body and the second mold body is provided with an insertion groove, and the positioning pins are inserted into the insertion grooves.

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