A continuous extrusion press

Abstract

This invention discloses a continuous extrusion press, relating to the field of continuous extrusion technology. It includes a frame and an extrusion wheel, a compaction wheel assembly, a cavity, and a die mounted on the frame. The extrusion wheel has annular protrusions on both sides of its annular groove opening, with a gap between the two protrusions. The cavity has a cavity boss on its side near the extrusion wheel, and the die has a die boss on its side near the extrusion wheel, smoothly engaging with the cavity boss. Both the cavity boss and the die boss can enter the gap between the protrusions. A groove space is formed between the annular protrusions and the sidewall of the annular groove, allowing the extruded billet to be retained and adhered to its inner wall. This invention improves the friction between the billet and the annular groove of the extrusion wheel, ensuring the extrusion process proceeds smoothly.

Description

Technical Field

[0001] This invention relates to the field of continuous extrusion technology, and in particular to a continuous extrusion press. Background Technology

[0002] Continuous extrusion refers to a process where a grooved rotating extrusion wheel drives the billet forward through friction between the grooves and the billet. When the billet contacts the stop block, it is forced through the feed inlet into the cavity by the stop block and then extruded into various desired products by a die installed inside the cavity. Because the extrusion wheel rotates while the cavity remains stationary, a certain gap must exist between the curved surface of the cavity and the surface of the extrusion wheel. This gap inevitably causes the billet to be squeezed out, resulting in overflow.

[0003] Overflow is waste material generated during continuous extrusion. Reducing overflow can improve material utilization. A core technology of continuous extrusion is controlling the amount of overflow. In traditional continuous extrusion presses, overflow sealing is achieved through the radial clearance m1 between the extrusion roller and the arc surface of the cavity. Figure 1 As shown.

[0004] First, the change in radial runout of the extrusion wheel directly affects the change in the radial clearance m1 between the extrusion wheel and the cavity arc surface. Second, the different frictional heat generated by the extrusion wheel at different speeds leads to different thermal expansion of the extrusion wheel, resulting in a significant change in the radial clearance m1 between the extrusion wheel and the cavity arc surface at different speeds.

[0005] The above two reasons mean that the radial clearance m1 between the extrusion wheel and the cavity arc surface cannot be too small during continuous extrusion. If the radial clearance m1 between the extrusion wheel and the cavity arc surface is too small, it will cause severe wear between the extrusion wheel and the cavity during the extrusion process, resulting in damage to the extrusion wheel and the cavity due to wear. Conversely, if the radial clearance m1 between the extrusion wheel and the cavity arc surface is too large, it will cause a large amount of overflow, resulting in a reduction in material utilization.

[0006] US Patent 4054048 discloses a metal rotary extrusion apparatus, which involves sealing overflow by using the side of the boss and the side plane of the extrusion wheel groove. However, because the groove uses the same groove side plane, the method is only suitable for continuous extrusion of soft metals such as aluminum. For the extrusion of materials with slightly higher strength, such as copper, it is impossible to establish the friction conditions between the billet and the groove, so the extrusion process cannot be carried out. Summary of the Invention

[0007] The purpose of this invention is to provide a continuous extrusion press to solve the problems existing in the prior art, thereby increasing the friction between the billet and the annular groove of the extrusion wheel and ensuring the extrusion process of the billet.

[0008] To achieve the above objectives, the present invention provides the following solution:

[0009] This invention provides a continuous extrusion press, including a frame and an extrusion wheel, a cavity, and a die mounted on the frame. The extrusion wheel has an annular groove. Annular protrusions extending axially along the extrusion wheel are arranged on opposite sides of the opening end of the annular groove, with a gap between the two annular protrusions. A cavity boss is provided on the side of the cavity near the extrusion wheel. The die is mounted within the cavity boss, and a die boss is provided on the side of the die near the extrusion wheel that smoothly contacts the cavity boss. Both the cavity boss and the die boss can enter the gap between the protrusions. A groove space is formed between the annular protrusions and the sidewall of the annular groove. The groove space can retain the extruded blank and allow it to adhere to the inner wall of the groove space.

[0010] Preferably, a feed guide plate is also provided upstream of the cavity, and a feed boss is provided on the side of the feed guide plate near the extrusion wheel. The feed boss and the cavity boss are smoothly connected, and the feed boss, the cavity boss and the mold boss together form a boss body that cooperates with the extrusion wheel.

[0011] Preferably, the sides of the main body of the boss are called boss sides, and the sides of the annular protrusions on both sides that face each other are called protrusion sides. The vertical gap between the boss sides and the protrusion sides is δ, where δ is 0.001mm to 0.2mm.

[0012] The distance between the protruding side and the sidewall of the opening end of the annular groove is w, where w ≥ 0.6 mm;

[0013] From the end face of the retaining block towards the feed guide plate, the length of the boss body is L. Within the range of L≤30mm, H≥3.5mm, n≥H; where H is the vertical distance from the boss surface of the boss body to the wheel surface of the extrusion wheel, and H is the same or different at different angular positions on the circumference of the extrusion wheel (at different length positions of the boss body), and n is the height of the raised side.

[0014] Preferably, the side of the boss body closest to the extrusion roller is the boss surface, and the boss surface is an arc surface, or the boss surface is a smooth combination of an arc surface and a plane and a curved surface; the boss body is integrally formed with the cavity, or the cavity boss, the feeding boss and the mold boss are independently set and respectively installed on the cavity, the feeding guide plate and the mold.

[0015] Preferably, the boss body is integrally formed with the mold.

[0016] Preferably, the side of the cavity near the extrusion wheel is the cavity surface, the side of the feed guide plate near the extrusion wheel is the feed guide plate surface, and an overflow discharge channel is formed between the cavity surface, the feed guide plate surface and the wheel surface of the extrusion wheel.

[0017] Preferably, both the surface of the cavity and the surface of the feed guide plate are provided with inclined surfaces, the inclined surfaces are directly connected to the side of the boss, and the overflow discharge channel is formed between the inclined surfaces and the wheel surface of the extrusion wheel; or, the inclined surfaces are connected to the side of the boss through an arc-shaped surface, and the overflow discharge channel is formed between the inclined surfaces and the arc-shaped surface and the wheel surface of the extrusion wheel.

[0018] Wherein, when the inclined surface is connected to the side of the boss through the arc-shaped surface, the vertical distance from the wheel surface of the extrusion wheel to the arc-shaped surface is m, where m≥0.8mm.

[0019] Preferably, the mold is mounted on a boot base, the boot base is mounted on the frame, the boot base has a through-hole for discharging products, the product discharging holes are connected to the mold holes of the mold, and the boot base also has mold cooling water holes.

[0020] The mold cooling water hole and / or the product discharge hole can supply cooling medium to the product outlet end face of the mold.

[0021] Preferably, the mold is provided with a plurality of mold holes.

[0022] Preferably, the shoe seat is rotatably mounted on the frame via a shoe seat pivot, and the shoe seat is connected to a hydraulic cylinder that can drive the shoe seat to rotate; a locking device is also rotatably mounted on the frame that can lock the shoe seat.

[0023] The present invention achieves the following technical effects compared to the prior art:

[0024] The annular groove of the present invention has annular protrusions on both sides of the opening end, and the annular protrusions and the sidewall of the annular groove form a groove space. The groove space can retain the extruded billet and make it adhere to the inner wall of the groove space, thereby increasing the friction between the billet and the annular groove of the extrusion wheel and ensuring the extrusion process of the billet. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a traditional continuous extrusion overflow seal in the prior art;

[0027] Figure 2 This is a cross-sectional view of the continuous extruder along the center line of the annular groove of the extrusion wheel in an embodiment of the present invention;

[0028] Figure 3 for Figure 2 A cross-sectional view of AA (without the base);

[0029] Figure 4 for Figure 2 A magnified view of a portion of the feed guide plate, cavity, mold, cavity cover, pressure plate, extrusion wheel, and shoe seat.

[0030] Figure 5 for Figure 4 A cross-sectional view of the BB (only the extrusion roller and feed guide plate are shown);

[0031] Figure 6 for Figure 4 CC cross-section (only the extrusion wheel, mold, cavity, and cavity cover are shown);

[0032] Figure 7 for Figure 4 The CC cross-section (the cavity surface is composed of a combination of arc-shaped surfaces and inclined surfaces).

[0033] Figure 1 In the middle, m1 is the radial clearance between the extrusion wheel and the cavity arc surface, 101 is the extrusion wheel, 102 is the mold, 103 is the cavity, and 104 is the cavity cover;

[0034] Figures 2-7 In the middle, 1-extrusion wheel, 2-cavity, 3-bore surface, 4-mold, 5-annular groove, 6-wheel surface, 7-stop block end face, 8-stop block, 9-bore body, 10-protruding side, 11-bore side, 12-spindle, 13-spindle bearing, 14-bearing seat, 15-frame, 16-base, 17-feed guide plate, 18-shoe seat, 19-shoe seat pivot, 20-cavity cover, 21-clamping device 22-Clamping device shaft, 23-Oil cylinder, 24-Compactor wheel assembly, 25-Scraper assembly, 26-Cooling water hole, 27-Pressure plate, 28-Arch-shaped surface, 29-Mold hole, 30-Rounded corner of extrusion wheel groove edge, 31-Mold surface, 32-Mold side, 33-Product outlet end face, 34-Mold cooling water hole, 35-Product discharge hole, 36-Sloping surface, 37-Overflow discharge channel, 38-Groove space;

[0035] The vertical distance from the surface of the boss body to the surface of the extrusion wheel;

[0036] δ - The vertical gap between the side of the boss and the side of the protrusion;

[0037] m - the vertical distance from the surface of the extrusion wheel to the arc-shaped surface;

[0038] L - The length of the boss body facing the end of the self-closing material block towards the feed guide plate;

[0039] w - the distance between the raised side and the sidewall of the opening end of the annular groove;

[0040] n - Height of the convex side. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] The purpose of this invention is to provide a continuous extrusion press to solve the problems existing in the prior art, thereby increasing the friction between the billet and the annular groove of the extrusion wheel and ensuring the extrusion process of the billet.

[0043] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] Example 1

[0045] like Figures 2-7 As shown, this embodiment provides a continuous extrusion press, mainly including a frame 15 and an extrusion wheel 1, a compaction wheel assembly 24, a cavity 2, and a die 4 mounted on the frame 15. The extrusion wheel 1 is rotatably mounted on the frame 15 via a main shaft 12. Specifically, the extrusion wheel 1 is mounted on the main shaft 12, and main shaft bearings 13 are provided on both sides of the main shaft 12 for support. The main shaft bearings 13 are installed in bearing seats 14, which are mounted on the frame 15. The frame 15 is mounted on a base 16. An annular groove 5 is provided on the outer circumference of the extrusion wheel 1. The compaction wheel assembly 24 is used to press the billet into the annular groove 5 of the extrusion wheel 1, establishing the initial friction between the billet and the annular groove 5. A stop block 8 is provided downstream of the die 4 (on the side away from the compaction wheel assembly 24). The stop block 8 can block the billet in the annular groove 5 so that it enters the die 4. It should be noted that the above structure is a mature existing technology in this field, and will not be described in detail in this embodiment.

[0046] In this embodiment, the annular groove 5 has annular protrusions extending axially along the extrusion wheel 1 on both sides of its opening end, with a gap between the two annular protrusions. The cavity 2 has a cavity boss on the side near the extrusion wheel 1. The mold 4 is installed in the mounting hole on the surface of the cavity boss (the side near the extrusion wheel 1) near the stop block 8. The mold 4 also has a mold boss on the side near the extrusion wheel 1 that smoothly connects with the cavity boss. Both the cavity boss and the mold boss can enter the gap between the protrusions. A groove space 38 is formed between the annular protrusions and the sidewall of the annular groove 5. The groove space 38 can retain the extruded blank and make it adhere to the inner wall of the groove space 38, thereby increasing the friction between the blank and the annular groove 5 of the extrusion wheel 1 and ensuring the extrusion process of the blank.

[0047] In this embodiment, as Figure 4 As shown, the cavity 2 is installed inside the shoe seat 18 and fixed by the cavity cover 20. A feed guide plate 17 is installed on the upstream side of the cavity 2 (near the end of the compaction wheel assembly). The feed guide plate 17 also has a feed boss with the same width as the cavity boss on the side near the extrusion wheel 1. The cavity boss, the feed boss and the mold boss together form the boss body 9. A pressure plate 27 is provided at the upper end of the feed guide plate 17. The feed guide plate 17 and the cavity 2 are fixed on the shoe seat 18 by the pressure plate 27.

[0048] The shoe seat 18 is rotatably mounted on the frame 15 via a shoe seat pivot 19. The shoe seat 18 can rotate around the shoe seat pivot 19, and both ends of the shoe seat pivot 19 are mounted on the frame 15. A clamping device 21 is also provided on the frame 15. When the shoe seat 18 is in operation, the clamping device 21 positions and locks the shoe seat 18 onto the frame 15. The clamping device 21 is rotatably mounted on the frame via a clamping device shaft 22. The clamping device 21 can rotate around the clamping device shaft 22 to open or close the shoe seat 18. Both ends of the clamping device shaft 22 are mounted on the frame 15. In this embodiment, the clamping device 21 can be selected according to specific working needs. For example, the clamping device 21 can be a clamping block, which can be driven by a hydraulic cylinder to rotate around the clamping device shaft 22 to open or close the shoe seat 18. Furthermore, the shoe base 18 is connected to a hydraulic cylinder 23, which drives the shoe base 18 to open or close. One end of the hydraulic cylinder 23 is rotatably connected to the shoe base 18, and the other end is rotatably connected to the base 16.

[0049] In this embodiment, the spindle bearing 13 is preferably a cylindrical roller bearing, which makes it easy for the spindle system to move on the spindle bearing 13, and facilitates the automatic alignment of the boss body 9 and the stop block 8 with the annular groove 5.

[0050] In this embodiment, the extrusion roller 1 is provided with cooling water holes 26 for passing cooling water to cool the extrusion roller 1, reduce its thermal expansion, and avoid wear caused by direct contact between the raised side 10 and the boss side 11 of the extrusion roller 1 due to thermal expansion.

[0051] In this embodiment, a scraper assembly 25 is also mounted on the frame 15. The scraper assembly 25 is used to remove excess material from the wheel surface 6 (outer circular surface) of the extrusion roller 1; specifically, as shown... Figure 2 As shown, the scraper assembly 25 mainly includes a scraper and a scraper drive device. The scraper drive device can drive the scraper to approach or move away from the extrusion roller 1. When it approaches the extrusion roller 1, it can remove the overflow material from the wheel surface 6 of the extrusion roller 1. The scraper drive device can be selected as needed, such as a hydraulic rod or a linear motor.

[0052] In this embodiment, as Figures 5-6 As shown, the distance between the raised side 10 and the sidewall of the opening end of the annular groove 5 (the height of the annular protrusion along the axial direction of the extrusion wheel 1) is w, and the value of w is not less than 0.6 mm; the vertical gap between the boss side 11 and the raised side 10 is δ, and δ is 0.001~0.2 mm; the radius of the circle of the boss surface 3 (the side closest to the extrusion wheel 1) is not less than the minimum radius of the circle of the raised side 10, that is, the height n of the raised side 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. The vertical gap value δ between the boss side 11 and the raised side 10 should be kept as equal as possible on both sides to ensure that the overflow generated on both sides is balanced during the production process and to keep the overflow amount during the extrusion process to a minimum.

[0053] In this embodiment, the gap between the raised side 10 and the boss side 11 is used to seal the extruded material. The gap between the boss side 11 and the raised side 10 can be set very small, which greatly reduces overflow, improves material utilization, and solves the problem of small cross-section product size changes caused by the periodic fluctuation of overflow due to the radial runout of the extrusion roller 1, which leads to fluctuations in the product extrusion line speed. This improves the dimensional accuracy of the product. Moreover, by installing the mold 4 as close as possible to the bottom of the annular groove 5, the friction on the billet flow channel is minimized, and the extrusion load is reduced.

[0054] In this embodiment, when extruding materials such as copper that are not bonded to the extrusion wheel 1, harmful friction between the wheel surface 6 and the extruded blank is greatly reduced, heat generation is reduced, and the temperature of the extrusion wheel 1 is lowered while saving energy, thus increasing the service life of the extrusion wheel 1.

[0055] In this embodiment, from the end face 7 (blocking surface) of the retaining block towards the feed guide plate 17, within a range where the length L of the boss body 9 is no greater than 30mm, the vertical distance H from the boss surface of the boss body 9 to the wheel surface 6 of the extrusion wheel is no less than 3.5mm, preferably 5-8mm. To increase the overflow sealing effect, the radius of the fillet 30 at the edge of the extrusion wheel groove (the fillet at the edge of the annular protrusion away from the annular groove) is generally 0.1-0.5mm.

[0056] In this embodiment, as Figure 7 As shown, an overflow discharge channel 37 is connected to the end of the boss side 11 away from the extrusion wheel 1. Specifically, the overflow discharge channel 37 can be formed by a combination of an arc-shaped surface 28 and a slope 36, or it can be formed directly by the slope 36. The outward expansion angle β of the slope 36 is not less than 3° to facilitate smooth overflow discharge. The vertical distance m from the wheel surface 6 to the arc-shaped surface 28 is not less than 0.8mm. Using a larger m value is beneficial for smooth overflow discharge, reducing the temperature of the extrusion wheel 1, and improving the service life of the extrusion wheel 1. In this embodiment, the arc-shaped surface 28 is mainly set to facilitate the installation position detection after the cavity 2 is installed into the shoe seat 18. When the detection can be completed without setting the arc-shaped surface 28, the arc-shaped surface 28 can be removed, and the overflow discharge channel 37 can be set to be formed by the slope 36.

[0057] In this embodiment, when the boss body 9 of the cavity 2 has a mold mounting groove that runs through the main shaft axis, a mold 4 is installed in the mold mounting groove. The width of the mold 4 is equal to the width of the boss body 9. At this time, the mold 4 is a component of the boss body 9. The mold surface 31 and the boss surface 3 are basically smoothly connected, and the mold side 32 and the boss side 11 should be smoothly connected.

[0058] In this embodiment, the mold 4 can be provided with one mold hole 29, or two or more mold holes 29. It is preferred to use a dual-hole mode to extrude two products at the same time.

[0059] In this embodiment, the boss body 9 can be segmented on the feed guide plate 17 and the cavity 2, or the feed guide plate 17 and the cavity 2 can be set as an integral part, and the boss body 9 can also be an integral part; furthermore, the side of the boss body 9 close to the extrusion roller 1 is the boss surface 3, and the boss surface 3 can be a circular arc surface, or a combination of a circular arc surface, a plane and a curved surface.

[0060] In this embodiment, the baffle block 8 can be an independent part embedded in the cavity 2, or it can be an integral part that is integrated with the cavity 2.

[0061] In this embodiment, the vertical distance H from the boss surface of the boss body 9 to the wheel surface 6 of the extrusion wheel is preferably larger the closer it is to the stop side, but it can also remain basically unchanged.

[0062] In this embodiment, when extruding small-section products, in order to reduce the mold temperature and improve the mold service life, a cooling medium is supplied to the product outlet end face 33 of the mold 4. Specifically, a mold cooling water hole 34 is provided on the cavity 2, and the mold cooling water hole 34 is located close to the product outlet end face 33 of the mold 4. The cooling medium can be provided separately through the mold cooling water hole 34 on the cavity 2; or it can be supplied through the product discharge hole 35, wherein one end of the product discharge hole 35 is connected to the product outlet of the mold 4, and the other end passes through the cavity cover and the shoe seat for product discharge.

[0063] In this embodiment, the cooling medium is preferably provided separately through the mold cooling water hole 34 on the cavity 2.

[0064] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A continuous extrusion press, comprising a frame and an extrusion roller, a cavity, and a die mounted on the frame, wherein the extrusion roller has an annular groove; characterized in that: The annular groove has annular protrusions extending axially along the extrusion wheel on both sides of its opening end, with a gap between them. A cavity boss is provided on the side of the cavity near the extrusion wheel, and the mold is installed inside the cavity boss. A mold boss is also provided on the side of the mold near the extrusion wheel, smoothly engaging with the cavity boss. Both the cavity boss and the mold boss can enter the gap between the protrusions. The distance between the two annular protrusions is less than the distance between the two ends of the opening of the annular groove. A groove space is formed between the annular protrusions and the sidewall of the annular groove, allowing the extruded blank to be retained and adhered to the inner wall of the groove space. A feed guide plate is also provided upstream of the cavity. A feed boss is provided on the side of the feed guide plate near the extrusion wheel. The feed boss and the cavity boss are smoothly connected. The feed boss, the cavity boss and the mold boss together form a boss body that cooperates with the extrusion wheel. The mold is mounted on the boot base, the boot base is mounted on the frame, the boot base has a through-hole for product discharge, the product discharge hole is connected to the mold hole of the mold, and the boot base also has a mold cooling water hole. The mold cooling water hole and / or the product discharge hole can supply cooling medium to the product outlet end face of the mold.

2. The continuous extrusion press according to claim 1, characterized in that: The sides of the main body of the boss are called the boss sides, and the sides of the annular protrusions on both sides that are opposite each other are called the protrusion sides. The vertical gap between the boss sides and the corresponding protrusion sides is δ, where δ is 0.001mm~0.2mm. The distance between the protruding side and the sidewall of the opening end of the annular groove is w, where w ≥ 0.6 mm; From the end face of the feed block towards the feed guide plate, the length of the boss body is L. Within the range of L≤30mm, H≥3.5mm, n≥H; where H is the vertical distance from the boss surface of the boss body to the wheel surface of the extrusion wheel, and H is the same or different at different angular positions on the circumference of the extrusion wheel, and n is the height of the protruding side.

3. The continuous extrusion press according to claim 1 or 2, characterized in that: The surface of the boss body is an arc surface, or the surface of the boss is a smooth combination of an arc surface and a plane and a curved surface; the boss body is integrally formed with the cavity, or the cavity boss, the feeding boss and the mold boss are independently set and respectively installed on the cavity, the feeding guide plate and the mold.

4. The continuous extrusion press according to claim 1 or 2, characterized in that: The boss body is integrally formed with the mold.

5. The continuous extrusion press according to claim 1, characterized in that: The side of the cavity closest to the extrusion wheel is the cavity surface, and the side of the feed guide plate closest to the extrusion wheel is the feed guide plate surface. An overflow discharge channel is formed between the cavity surface, the feed guide plate surface and the wheel surface of the extrusion wheel.

6. The continuous extrusion press according to claim 5, characterized in that: Both the surface of the cavity and the surface of the feed guide plate are provided with inclined surfaces. The inclined surfaces are directly connected to the side of the boss, and the overflow discharge channel is formed between the inclined surfaces and the wheel surface of the extrusion wheel; or, the inclined surfaces are connected to the side of the boss through an arc-shaped surface, and the overflow discharge channel is formed between the inclined surfaces and the arc-shaped surface and the wheel surface of the extrusion wheel.

7. The continuous extrusion press according to claim 6, characterized in that: When the inclined surface is connected to the side of the boss through the arc-shaped surface, the vertical distance from the wheel surface of the extrusion wheel to the arc-shaped surface is m, where m ≥ 0.8 mm.

8. The continuous extrusion press according to claim 1, characterized in that: The mold has multiple mold holes.

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