Continuous extrusion machinery

Abstract

A continuous extrusion machine (Figure 2) includes a chamber 2 and a die 4 mounted to a rack 15. An annular groove 5 is formed in an extrusion wheel 1, with annular protrusions 10 arranged on opposite

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of continuous extrusion, in particular to a continuous extrusion machinery. BACKGROUND

[0002] Continuous extrusion refers to a rotating extrusion wheel with a groove. Feedstock rods are driven to move forward through the friction between the groove and the rod. When the rod is in contact with a stop block, the billet enters into a chamber through a feeding hole of the chamber and is extruded into various required products through a die mounted in the chamber. Because the extrusion wheel is rotatable and the chamber is fixed, a certain gap is formed between a chamber cambered surface and an extrusion wheel surface. Due to the existence of the gap, the extrusion of the rod from the gap is certainly caused, and flash is formed.

[0003] The flash is waste materials generated in the continuous extrusion process, and the material utilization rate can be improved by reducing the flash amount. A key technology of continuous extrusion is how to control the flash amount. The flash seal of a traditional continuous extrusion machine is realized through a radial gap mi between the extrusion wheel and the chamber cambered surface, as shown in FIG. 1.

[0004] Firstly, the variation of the rotating radial runout of the extrusion wheel directly affects the variation of the radial gap mi between the extrusion wheel and the chamber cambered surface. Secondly, the difference of friction heat quantity of the extrusion wheel at different rotational speeds leads to the difference of thermal expansion of the extrusion wheel, so that the radial gap mi between the extrusion wheel and chamber cambered surface changes greatly at different rotational speeds of the extrusion wheel.

[0005] Because of the above two reasons, the radial gap mi between the extrusion wheel and the chamber cambered surface should not be too small in the continuous extrusion process. If the radial gap mi between the extrusion wheel and the chamber cambered surface is too small, severe wear between the extrusion wheel and the chamber is caused during the extrusion process, and the result is that the extrusion wheel and the chamber are damaged due to wear. On the contrary, if the radial gap mi between the extrusion wheel and the chamber cambered surface is too large, a large amount of material flash is caused, and the material utilization rate is reduced.

[0006] The American patent US4054048 discloses a metal rotary extrusion device. A boss side surface and a groove side face of the extrusion wheel are used for sealing the flash. However, 21 08 24 because the groove side face is consistent from top to bottom, the method is only suitable for the continuous extrusion of soft metals such as aluminum. For the extrusion of materials with slightly higher strength such as copper, the friction condition between the billets and the groove cannot be established, and the extrusion process is impossible. SUMMARY

[0007] The present disclosure aims to provide a continuous extrusion machine so as to solve the problems in the prior art. The friction force between rod and an annular groove of an extrusion wheel can be improved, so as to ensure the billet extrusion process.

[0008] In order to achieve the purpose, the present disclosure provides the following scheme.

[0009] The present disclosure provides a continuous extrusion machine. The continuous extrusion machine includes a rack, and an extrusion wheel, a compaction wheel assembly, a chamber and a die which are mounted on the rack. An annular groove is formed in the extrusion wheel. Annular protrusions inward extending along an axial direction of the extrusion wheel are oppositely arranged on both sides of an open end of the annular groove. A protrusion gap is formed between the annular protrusions on both sides. A surface, close to the extrusion wheel, of the chamber is provided with a chamber boss. A die is mounted in the chamber boss. A surface, close to the extrusion wheel, of the die is provided with a die boss contacted with the chamber boss. The chamber boss and the die boss both enter the protrusion gap. A groove space is formed between the annular protrusion and a side wall of the annular groove. The groove space is configured for holding a rod to be extruded, and the rod to be extruded is adhered to an inner wall of the groove space, a lower stream of the die is provided with a stop block configured for blocking the rod to be extruded in the annular groove, so that the rod to be extruded enters the die, a feed-guiding plate is also provided at an upper stream of the chamber. A surface, close to the extrusion wheel, of the feed-guiding plate is provided with a feed boss. The feed boss is contacted with the chamber boss. The feed boss, the chamber boss and the die boss together form a boss body which is matched with the extrusion wheel. H is a vertical distance from a boss surface of the boss body to a wheel surface of the extrusion wheel, H is identical at different angle positions of circumference of the extrusion wheel.

[0010] Preferably, the side surfaces on both sides of the boss body are boss side surfaces. The opposite side surfaces of the annular protrusions on both sides are protrusion side surfaces. A gap value in a vertical direction between the boss side surfaces and the respective protrusion side surfaces is 6, and 8 is 0.001 mm to 0.2 mm.

[0011] The distance between the protrusion side surfaces and the side wall of the open end of the 21 08 24 annular groove is w, and w is greater than or equal to 0.6 mm.

[0012] In the direction from a stop block end face to the feed-guiding plate, the length value of the boss body is L, and in the range of L being less than or equal to 30 mm, H is greater than or equal to 3.5 mm, and n is greater than or equal to H. Wherein n is a height of the protrusion side surface.

[0013] Preferably, the surface, close to the extrusion wheel, of the boss body is a boss surface, and the boss surface is an arc surface, or the boss surface is a combination of an arc surface, a plane and a curved surface. The boss body is integrally formed with the chamber, or the chamber boss, the feed boss and the die boss are independently arranged and respectively formed on the chamber, the feed-guiding plate and the die.

[0014] Preferably, the boss body is integrally formed with the die.

[0015] Preferably, the surface, close to the extrusion wheel, of the chamber is a chamber surface. The surface, close to the extrusion wheel, of the feed-guiding plate is a feed-guiding plate surface. A flash discharge channel is formed among the chamber surface, the feed-guiding plate surface and the wheel surface of the extrusion wheel.

[0016] Preferably, the chamber surface and the feed-guiding plate surface are both provided with inclined faces, the inclined faces are directly connected with the boss side surfaces, and the flash discharge channel is formed between the inclined faces and the wheel surface of the extrusion wheel; or, the inclined faces are connected with the boss side surfaces through an arcuate cambered surfaces, respectively, and the flash discharge channel is formed among the inclined faces, the arcuate cambered surfaces and the wheel surface of the extrusion wheel.

[0017] Wherein, when the inclined faces are connected with the boss side surfaces through the arcuate cambered surfaces, respectively, the vertical distance between the wheel surface of the extrusion wheel and the arcuate cambered surfaces is m, and m is greater than or equal to 0.8 mm.

[0018] Preferably, the die is mounted on a shoe. The shoe is mounted on the rack. A product discharge hole is formed in and penetrates through the shoe. The product discharge hole communicates with a plurality of die holes of the die. A die cooling water hole is also formed in the shoe.

[0019] The die cooling water hole and / or the product discharge hole can introduce a cooling medium to a product outlet end face of the die.

[0020] Preferably, a plurality of die holes are formed in the die.

[0021] Preferably, the shoe is rotatably mounted on the rack through a shoe pivot, and the shoe is connected with an oil cylinder. The oil cylinder can drive the shoe to rotate. A locking device is also rotatably mounted on the rack, and the locking device can lock the shoe. 21 08 24

[0022] Compared with the prior art, the present disclosure has the following technical effects.

[0023] The annular protrusions are oppositely arranged on both sides of the open end of the annular groove. The groove space is formed between the annular protrusions and a side wall of the annular groove. The groove space can hold extruded rod, and the extruded rod are adhered to an inner wall of the groove space, so that the friction force between the rod and the annular groove of the extrusion wheel can be improved, and the billet extrusion process is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] To more clearly illustrate the present embodiment of the present disclosure or the technical scheme in the prior art, the following briefly introduces the attached figures to be used in the present embodiment. Apparently, the attached figures in the following description show merely some embodiments of the present disclosure, and those skilled in the art may still derive other drawings from these attached figures without creative efforts.

[0025] FIG. 1 is a flash sealing schematic diagram of traditional continuous extrusion in the prior art.

[0026] FIG. 2 is a sectional view of a continuous extrusion machine along a central line of an annular groove of an extrusion wheel according to an embodiment of the present disclosure.

[0027] FIG. 3 is a sectional view of FIG. 2 taken along a line A-A (a base is omitted).

[0028] FIG. 4 is a partial enlarged view of FIG. 2 (only leaving parts of a feed-guiding plate, a chamber, a die, a chamber cover, a pressure plate, an extrusion wheel and a shoe).

[0029] FIG. 5 is a sectional view of FIG. 4 taken along a line B-B (only leaving parts of an extrusion wheel and a feed-guiding plate).

[0030] FIG. 6 is a sectional view of FIG. 4 taken along a line C-C (only leaving an extrusion wheel, a die, a chamber and a chamber cover).

[0031] FIG. 7 is a sectional view of FIG. 4 taken along a line C-C (a chamber surface is formed by a combination of an arcuate cambered surface and an inclined face).

[0032] In FIG. 1, mi, radial gap between extrusion wheel and chamber cambered surface; 101, extrusion wheel; 102, die; 103, chamber; and 104, chamber cover.

[0033] In FIG. 2 to FIG. 7, 1, extrusion wheel; 2, chamber; 3, boss surface; 4, die; 5, annular groove; 6, wheel surface; 7, end face of stop block; 8, stop block; 9, boss body; 10, protrusion side surface; 11, boss side surface; 12, main shaft; 13, main shaft bearing; 14, bearing seat; 15, rack; 16, base; 17, feed-guiding plate; 18, shoe; 19, shoe pivot; 20, chamber cover; 21, compressing means; 22, compressing means shaft; 23, oil cylinder; 24, compaction wheel assembly; 25, scraper assembly; 26, cooling water hole; 27, pressure plate; 28, arcuate cambered surface; 29, die hole; 21 08 24 30, rounded corner at groove edge of extrusion wheel; 31, die surface; 32, die side surface; 33, end face of product outlet; 34, die cooling water hole; 35, product discharge hole; 36, inclined face; 37, flash discharge channel; and 38, groove space;

[0034] H, vertical distance from boss surface of boss body to wheel surface of extrusion wheel;

[0035] 8, gap value in vertical direction between boss side surface and protrusion side surface;

[0036] m, vertical distance from wheel surface of extrusion wheel to arcuate cambered surface;

[0037] L, length value of boss body in a direction from end face of stop block to feed-guiding plate;

[0038] w, distance between protrusion side surface and side wall of open end of annular groove; and

[0039] n, height of protrusion side surface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] The foilowing clearly and completely describes the technical scheme in the present embodiments of the present disclosure with reference to the attached figures in the present embodiments of the present disclosure. Apparently, the described embodiments are merely a part rather than all of the present embodiments of the present disclosure. Based on the embodiment in the present disclosure, all other embodiments obtained by the ordinary technical staff in the art under the premise of without contributing creative labor belong to the scope protected by the present disclosure.

[0041] The present disclosure aims to provide a continuous extrusion machine so as to solve the problems in the prior art. The friction force between rod and an annular groove of an extrusion wheel can be improved, and the billet extrusion process is ensured.

[0042] To make the foregoing objective, features and advantages of the present disclosure clearer and more comprehensible, the present disclosure is further described in detail below with reference to the attached figures and specific embodiments.

[0043] Embodiment I

[0044] As shown in FIG. 2 to FIG. 7, the embodiment provides a continuous extrusion machine. The continuous extrusion machine mainly includes a rack 15, and an extrusion wheel 1, a compaction wheel assembly 24, a chamber 2 and a die 4 which are mounted to the rack 15. The extrusion wheel 1 is rotatably mounted on the rack 15 through a main shaft 12. Specifically, the extrusion wheel 1 is mounted to the main shaft 12. Main shaft bearings 13 are arranged on both sides of the main shaft 12 for supporting. The main shaft bearing 13 is mounted in a bearing seat 14. The bearing seat 14 is mounted to the rack 15. The rack 15 is mounted on a base 16. An annular 21 08 24 groove 5 is formed in an outer circumferential surface of the extrusion wheel 1. The compaction wheel assembly 24 is used for pressing rod into the annular groove 5 of the extrusion wheel 1 to cause an initial friction between the rod and the annular groove 5. A stop block 8 is provided at the lower stream of the die 4 (the side away from the compaction wheel assembly 24). The stop block 8 can block the rod in the annular groove 5, so that the rod enters the die 4. Wherein, it needs to be noted that the above-mentioned structure is a mature prior art in the art and is not described in detail in the embodiment.

[0045] In this embodiment, annular protrusions axially extending along the extrusion wheel 1 are oppositely arranged on both sides of an open end of the annular groove 5. A protrusion gap is formed between the annular protrusions on both sides. A surface, close to the extrusion wheel 1, of the chamber 2 is provided with a chamber boss. A die 4 is mounted in a mounting hole formed in a position close to the stop block 8 on the boss surface of the chamber (the surface close to the extrusion wheel 1). A surface, close to the extrusion wheel 1, of the die 4 is provided with a die boss smoothly contacted with the chamber boss. The chamber boss and the die boss both can enter the protrusion gap. Agroove space 38 is formed between the annular protrusions and a side wall of the annular groove 5. The groove space 38 can hold extruded rod, and the extruded rod are adhered to an inner wall of the groove space 38, so that the friction force between the rod and the annular groove 5 of the extrusion wheel 1 can be improved, and the billet extrusion process is ensured.

[0046] In the embodiment, as shown in FIG. 4, the chamber 2 is mounted in a shoe 18 and fixed by a chamber cover 20. A feed-guiding plate 17 is also provided at the upper stream of the chamber 2 (the end close to the compaction wheel assembly). A surface, close to the extrusion wheel 1, of the feed-guiding plate 17 is also provided with a feed boss with the same width as the chamber boss. The chamber boss, the feed boss and the die boss together form a boss body 9. A pressure plate 27 is provided at an upper end of the feed-guiding plate 17. The feed-guiding plate 17 and the chamber 2 are fixed to the shoe 18 through the pressure plate 27.

[0047] The shoe 18 is rotatably mounted on the rack 15 through a shoe pivot 19. The shoe 18 can be rotated around the shoe pivot 19. Both ends of the shoe pivot 19 are mounted on the rack 15. A compressing means 21 is also provided on the rack 15. When the shoe 18 works, the shoe 18 is positioned and locked on the rack 15 by the compressing means 21. Wherein, the compressing means 21 is rotatably mounted on the rack through a compressing means shaft 22. The compressing means 21 can be rotated around the compressing means shaft 22 to realize the opening or compressing of the shoe 18. Both ends of the compressing means shaft 22 are mounted to the rack 15. In the embodiment, the compressing means 21 can be selected according to specific work 21 08 24 requirements. For example, the compressing means 21 can be a compressing block, and a compressing block can be driven to rotate around the compressing means shaft 22 by a hydraulic cylinder to realize the opening or compressing block of the shoe 18. Further, the shoe 18 is connected with an oil cylinder 23. The oil cylinder 23 drives the shoe 18 to open or close. One end of the oil cylinder 23 is rotatably connected to the shoe 18, and the other end of the oil cylinder 23 is rotatably connected to the base 16.

[0048] In the embodiment, the main shaft bearing 13 is preferably a cylindrical roller bearing, so that a main shaft system can be easily moved on the main shaft bearing 13, and the boss body 9 and the stop block 8 can be automatically aligned with the annular groove 5.

[0049] In the embodiment, a cooling water hole 26 is formed in the extrusion wheel 1 and used for introducing cooling water to cool the extrusion wheel 1, so that the thermal expansion quantity of the extrusion wheel 1 is reduced, and wear caused by direct contact between the protrusion side surfaces 10 of the extrusion wheel 1 and the boss side surfaces 11 due to thermal expansion is avoided.

[0050] In this embodiment, a scraper assembly 25 is also mounted on the rack 15, and the scraper assembly 25 is used for removing the flash of the wheel surface 6 (outer round surface) of the extrusion wheel 1. Specifically, as shown in FIG. 2, the scraper assembly 25 mainly includes a scraper and a scraper driver. The scraper driver can drive the scraper to get close to or away from the extrusion wheel 1. When the scraper gets close to the extrusion wheel 1, the scraper can remove the flash of the wheel surface 6 of the extrusion wheel 1. Wherein, the scraper driver can be selected according to requirements, such as a hydraulic rod or a linear motor.

[0051] In the embodiment, as shown in FIG. 5 to FIG. 6, the distance between the protrusion side surfaces 10 and a side wall of an open end of the annular groove 5 (the protrusion height of the annular protrusions along the axial direction of the extrusion wheel 1) is w, and the value of w is not less than 0.6 mm. A gap value in the vertical direction between the boss side surfaces 11 and respective protrusion side surface 10 is S, and 5 is 0.001 mm to 0.2 mm. The circular radius of the boss surface 3 (the surface close to the extrusion wheel 1) is not less than the minimum circular radius of the protrusion side surfaces 10, that is, the height n of the protrusion side surfaces 10 (the height along the radial direction of the extrusion wheel 1) is not less than the vertical distance h from the boss surface of the boss body 9 to the wheel surface 6 of the extrusion wheel, and the gap value 5 in the vertical direction between the boss side surfaces 11 and the protrusion side surfaces 10 should be kept the same on both sides as far as possible, so that it is ensured that the flash generated on both sides is balanced in the production process and the flash amount in the extrusion process is kept at a minimum. 21 08 24

[0052] In the embodiment, the gap between the protrusion side surface 10 and the protrusion side surface 11 is used for sealing an extrusion material, so that the gap between the boss side surface 11 and the protrusion side surface 10 can be set to be very small, the flash is greatly reduced, the material utilization rate is improved, the problem of the size change of the small section product caused by the periodic fluctuation of the flash caused by the radial runout of the extrusion wheel 1 and the fluctuation of the extrusion linear speed of the product is solved, and the dimensional accuracy grade of the product is improved. Moreover, the die 4 is mounted near the bottom of the annular groove 5 to the maximum extent, so that the friction force on a billet flow channel is reduced to the maximum extent, and the extrusion load is reduced.

[0053] In the embodiment, when a material such as copper that is not bonded to the extrusion wheel 1 is extruded, harmful friction between the wheel surface 6 and the extruded rod is greatly reduced, the heat quantity is reduced, the temperature of the extrusion wheel 1 is reduced while energy is saved, and the service life of the extrusion wheel 1 is prolonged.

[0054] In the embodiment, in the direction from an end face of stop block 7 to the feed-guiding plate 17, the length value L of the boss body 9 is not greater than 30 mm. The vertical distance H from a boss surface of the boss body 9 to a wheel surface 6 of the extrusion wheel is not less than 3.5 mm, preferably 5 to 8 mm. In order to increase the sealing effect of the flash, the radius of a rounded comer at groove edge of extrusion wheel 30 (an edge fillet at the end, away from the annular groove, of the annular protrusion) is generally 0.1 to 0.5 mm.

[0055] In the embodiment, as shown in FIG. 7, the end, away from the extrusion wheel 1, of the boss side surface 11 is connected with a flash discharge channel 37. Specifically, the flash discharge channel 37 can be formed in combination with the arcuate cambered surfaces 28 and the inclined faces 36, and also can be formed by inclined faces 36 directly. The outward expansion angles P of the inclined faces 36 are not less than 3°, thus facilitating the smooth discharge of the flash. The vertical distance m from the wheel surface 6 to the arcuate cambered surfaces 28 is not less than 0.8 mm, and the adoption of a larger m value is conducive to the smooth discharge of the flash, thus reducing the temperature of the extrusion wheel 1 and prolonging the service life of the extrusion wheel 1. In the embodiment, the arcuate cambered surfaces 28 are provided to facilitate the detection of a mounting position after the chamber 2 is mounted in the shoe 18. When the detection can be completed without the arcuate cambered surfaces 28, the arcuate cambered surfaces 28 can be canceled and the flash discharge channel 37 can be formed by inclined surfaces 36.

[0056] In the embodiment, when a die mounting groove penetrating along the axis direction of the main shaft is formed in the boss body 9 of the chamber 2, a die 4 is mounted in the die mounting 21 08 24 groove, and the width of the die 4 is equal to the width of the boss body 9. At this time, the die 4 is a component of the boss body 9, and the die surface 31 and the boss surface 3 are basically smoothly contacted, and the die side surface 32 and the boss side surface 11 should be smoothly contacted.

[0057] In the embodiment, a die hole 29 can be formed in the die 4, or two or more die holes 29 can be formed in the die 4. Preferably, in a double-holes mode, two products are extruded at the same time.

[0058] In the embodiment, the boss body 9 can be arranged on the feed-guiding plate 17 and the chamber 2 in sections, or the feed-guiding plate 17 and the chamber 2 can be arranged as an integral part, and the boss body 9 is also an integral part. Further, a surface, close to the extrusion wheel 1, of the boss body 9 is a boss surface 3, and the boss surface 3 may be an arc surface or a combination of an arc surface, a plane and a curved surface.

[0059] In the embodiment, the stop block 8 can be an independent part embedded in the chamber 2 or an integral part integrated with the chamber 2.

[0060] In the embodiment, the value H of the vertical distance from the boss surface of the boss body 9 to the wheel surface 6 of the extrusion wheel is preferably larger when closer to the stop side, and may be kept substantially unchanged.

[0061] In the embodiment, in order to reduce the temperature of the die and prolong the service life of the die, a cooling medium is introduced through an end face of product outlet 33 of the die 4 when a small cross-section product is extruded. Specifically, a die cooling water hole 34 is formed in the chamber 2, the die cooling water hole 34 is provided close to the end face of product outlet 33 of the die 4, and the cooling medium can be provided separately through the die cooling water hole 34 in the chamber 2. Or, the cooling medium can be introduced through a product discharge hole 35, wherein one end of the product discharge hole 35 communicates with a product outlet of the die 4, and the other end penetrates the chamber cover and the shoe for product discharge.

[0062] In the embodiment, the cooling medium is preferably provided separately through the die cooling water hole 34 in the chamber 2.

[0063] Specific examples are used for illustration of the principles and implementation methods of the present disclosure. The description of the above-mentioned embodiments is used to help illustrate the method and its core principles of the present disclosure. In addition, those skilled in the art can make various modifications in terms of specific embodiments and scope of application in accordance with the teachings of the present disclosure. In summary, the contents of this specification should not be understood as the limitation of the present disclosure. 21 08 24

Claims

1. A continuous extrusion machine, comprising a rack, and an extrusion wheel, a chamber and a die which are mounted to the rack, an annular groove being formed in the extrusion wheel, wherein annular protrusions inward extending along an axial direction of the extrusion wheel are oppositely arranged on both sides of an open end of the annular groove, a protrusion gap is formed between the annular protrusions on both sides, a surface, close to the extrusion wheel, of the chamber is provided with a chamber boss, the die is mounted in the chamber boss, an outer surface, close to the extrusion wheel, of the die is provided with a die boss contacted with the chamber boss, and the chamber boss and the die boss both enter the protrusion gap; and a groove space is formed between the annular protrusions and a side wall of the annular groove, the groove space is configured for holding a rod to be extruded, and the rod to be extruded is adhered to an inner wall of the groove space, a lower stream of the die is provided with a stop block configured for blocking the rod to be extruded in the annular groove, so that the rod to be extruded enters the die,a feed-guiding plate is also provided at an upper stream of the chamber, a surface, close to the extrusion wheel, of the feed-guiding plate is provided with a feed boss, the feed boss is contacted with the chamber boss, and the feed boss, the chamber boss and the die boss together form a boss body which is matched with the extrusion wheel, wherein H is a vertical distance from a boss surface of the boss body to a wheel surface of the extrusion wheel, H is identical at different angle positions of circumference of the extrusion wheel.

2. The continuous extrusion machine according to claim 1, wherein side surfaces on both sides of the boss body are boss side surfaces, and opposite side surfaces of the annular protrusions on both sides are protrusion side surfaces, and a gap value in a vertical direction between the boss side surfaces and respective protrusion side surfaces is 5, and 8 is 0.001 mm to 0.2 mm;a distance between the protrusion side surfaces and the side wall of the open end of the annular groove is w, and w is greater than or equal to 0.6 mm;a length value of the boss body in a direction from an end face of a stop block to the feedguiding plate is L, and in a range of L being less than or equal to 30 mm, H is greater than or equal to 3.5 mm, and n is greater than or equal to H; wherein n is a height of the protrusion side surfaces.

3. The continuous extrusion machine according to claim 1 or 2, wherein the boss surface of the boss body is an arc surface; and the boss body is integrally formed with the chamber.

4. The continuous extrusion machine according to claim 1 or 2, wherein the boss body is integrally formed with the die.

5. The continuous extrusion machine according to claim 1, wherein the surface, close to the21 08 24extrusion wheel, of the chamber is a chamber surface, the surface, close to the extrusion wheel, of the feed-guiding plate is a feed-guiding plate surface, and a flash discharge channel is formed among the chamber surface, the feed-guiding plate surface and the wheel surface of the extrusion wheel.

6. The continuous extrusion machine according to claim 5, wherein the chamber surface and the feed-guiding plate surface are both provided with inclined faces, the inclined faces are directly connected with the boss side surfaces, and the flash discharge channel is formed between the inclined faces and the wheel surface of the extrusion wheel; or, the inclined faces are connected with the boss side surfaces through arcuate cambered surfaces, respectively, and the flash discharge channel is formed among the inclined faces, the arcuate cambered surfaces and the wheel surface of the extrusion wheel.

7. The continuous extrusion machine according to claim 6, wherein when the inclined faces are connected with the boss side surfaces through the arcuate cambered surfaces, respectively, a vertical distance between the wheel surface of the extrusion wheel and the arcuate cambered surfaces is m, and m is greater than or equal to 0.8 mm.

8. The continuous extrusion machine according to claim 1, or any other preceding claim, wherein the die is mounted on a shoe, the shoe is mounted on the rack, a product discharge hole is formed in and penetrates through the shoe, the product discharge hole communicates with a plurality of die holes of the die, and a die cooling water hole is also formed in the shoe; andthe die cooling water hole and / or the product discharge hole are capable of introducing a cooling medium to an end face of a product outlet of the die.

9. The continuous extrusion machine according to claim 8, wherein the plurality of die holes are formed in the die.

10. The continuous extrusion machine according to claim 1 or 2, wherein the boss surface of the boss body is an arc surface; the chamber boss, the feed boss and the die boss are independently arranged and respectively formed on the chamber, the feed-guiding plate and the die.

11. The continuous extrusion machine according to claim 1 or 2, wherein the boss surface is a combination of an arc surface, a plane and a curved surface; the boss body is integrally formed with the chamber.

12. The continuous extrusion machine according to claim 1 or 2, wherein the boss surface is a combination of an arc surface, a plane and a curved surface; the chamber boss, the feed boss and the die boss are independently arranged and respectively formed on the chamber, the feed-guiding plate and the die.

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