A continuous extrusion apparatus for tangential extrusion

Abstract

This invention discloses a continuous extrusion apparatus for chordal extrusion, relating to the technical field of extrusion apparatuses. It includes a frame and an extrusion wheel, a compaction wheel assembly, and a cavity mounted on the frame. The extrusion wheel is rotatably mounted on the frame via a main shaft and has an annular groove. The compaction wheel assembly is used to press the extrusion rod material into the annular groove of the extrusion wheel. The cavity is provided with a stop block and a die. The stop block can block the extrusion rod material in the annular groove, allowing it to enter the die. The front end of the stop surface of the stop block is connected to a die mounting surface. The die is embedded in the die mounting surface, and the center line of the die hole is located in the chordal direction of the extrusion wheel. This invention can effectively reduce the extrusion load and extend the service life of the apparatus.

Description

Technical Field

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

[0002] A core technology of continuous extrusion is to reduce the radial pressure and torque of the extrusion rollers in order to improve the service life of the extrusion rollers, spindle, and spindle bearings.

[0003] Invention patent 201310022732.6 discloses a non-radial feeding continuous extrusion method and extrusion equipment. Although this patent changes the right-angle flow of the extrusion bar material in front of the stop block to an obtuse-angle flow, reducing the extrusion resistance, the height of the cavity inlet near the arc-shaped sealing block is significantly higher than that near the stop block, resulting in increased flow resistance and a significant increase in extrusion temperature and pressure.

[0004] Therefore, there is an urgent need to provide a new type of continuous extrusion device to reduce the extrusion load. Summary of the Invention

[0005] The purpose of this invention is to provide a continuous extrusion device for tangential extrusion, so as to solve the problems existing in the prior art, effectively reduce the extrusion load, and extend the service life of the device.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention provides a continuous extrusion apparatus for chordal extrusion, comprising a frame and an extrusion wheel, a compaction wheel assembly, and a cavity mounted on the frame. The extrusion wheel is rotatably mounted on the frame via a main shaft and has an annular groove. The compaction wheel assembly is used to press the extrusion rod material into the annular groove of the extrusion wheel. The cavity is provided with a stop block and a die. The stop block can block the extrusion rod material in the annular groove, so that it enters the die. The front end of the stop surface of the stop block is connected to a die mounting surface. The die is embedded in the die mounting surface, and the center line of the die hole of the die is located in the chordal direction of the extrusion wheel.

[0008] Preferably, the angle between the center line of the extrusion wheel passing through the starting point of the stop surface and the mold mounting surface is β, 85°≥β≥10°; wherein, the starting point of the stop surface is the point on the cross-section of the stop block, close to one end of the extrusion wheel.

[0009] Preferably, the side of the stop block near the bottom of the annular groove is a sealing arc surface, and the rear end of the sealing arc surface is connected to an expansion surface. A point B is provided on the expansion surface at a position 30mm backward from the starting point A. The angle between the line connecting the starting point A and point B and the center line of the mold hole is θ, where β+20°≥θ≥β+3°. Wherein, both the starting point A and the point B are located on the cross-section of the stop block, the center line of the mold hole is located on this cross-section, and the starting point A is the end point near the sealing arc surface.

[0010] Preferably, the vertical distance from the center line of the mold hole to the center line of the extrusion wheel that is parallel to it is H, 0.4981D+w≥H≥0.0868D+w; where D is the diameter of the extrusion wheel and w is the groove width of the annular groove.

[0011] Preferably, the front end of the cavity is provided with an arc-shaped sealing block, and the cavity and the arc-shaped sealing block are provided with a boss on the side facing the extrusion wheel. The boss can extend into the annular groove. The side planes of the boss on both sides extend to the mold mounting surface and are flush with the side plane of the stop block. The gap between the side plane of the boss and the side plane of the opening end of the annular groove is δ, where δ is 0.001mm-0.2mm.

[0012] Preferably, within a range of no more than 30mm in the direction of the mold mounting surface toward the bow-shaped sealing block, the vertical distance from the protrusion into the annular groove is m, where m ≥ 3.5mm, and the height of the side plane at the opening end of the annular groove is n, where n ≥ m.

[0013] Preferably, the surface of the boss is an arc surface, or the surface of the boss is a combination of an arc surface, a curved surface, and a plane.

[0014] The mold mounting surface is a plane or a curved surface, or a combination of a plane and a curved surface.

[0015] Preferably, the baffle block is further provided with a mold cooling channel, one end of which extends out of the cavity and the other end is close to the mold, so as to introduce a cooling medium into the mold.

[0016] Preferably, the mold has two mold holes symmetrically arranged along the groove of the annular groove, or the mold has two mold holes arranged vertically.

[0017] Preferably, the cavity is mounted on a boot seat, the boot seat is rotatably mounted on the frame via a boot seat pivot, and the boot seat is connected to a drive device that can drive the boot seat to rotate; a locking device is also rotatably mounted on the frame that can lock the boot seat.

[0018] The boot base can be set horizontally or vertically.

[0019] The present invention achieves the following beneficial technical effects compared to the prior art:

[0020] This invention mounts the mold on the stop block, minimizing the flow path of the extrusion rod material and reducing friction between the extrusion rod material and the stop block during the extrusion process. This effectively reduces the extrusion load and extends the service life of the device. Furthermore, this invention changes the flow path of the extrusion rod material from the approximately right-angle flow of traditional continuous extrusion to an obtuse-angle flow, further reducing the extrusion load. Compared with traditional tangential extrusion, this reduces damage to the stop block and further extends the service life of the device. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a cross-sectional view along the center line of the annular groove when the boot seat is vertically arranged in an embodiment of the present invention;

[0023] Figure 2 for Figure 1 AA cross-section view;

[0024] Figure 3 for Figure 1 The enlarged view shows only parts of the bow-shaped sealing block, cavity, baffle block, mold, cavity cover, pressure plate, extrusion wheel, and shoe seat.

[0025] Figure 4 for Figure 3 The enlarged view shows only the mold and the stop block, and only one mold hole is provided.

[0026] Figure 5 for Figure 3 The enlarged view shows only the mold and the stop block, with two mold holes at the top and bottom;

[0027] Figure 6 for Figure 3 The BB cross-section diagram only retains parts of the extrusion wheel, stop block, and cavity;

[0028] Figure 7 for Figure 6 A schematic diagram of a centrally mounted arch-shaped sealing block with a conventional boss;

[0029] Figure 8 for Figure 6 A schematic diagram of a centrally mounted bow-shaped sealing block with an axial sealing boss;

[0030] Figure 9 for Figure 8 The CC cross-sectional view only retains parts of the bow-shaped sealing block, cavity, baffle block, mold, cavity cover, pressure plate, extrusion wheel, and shoe seat;

[0031] Figure 10 for Figure 4 The DD cross-sectional view, and only one mold hole is set;

[0032] Figure 11 for Figure 10 A schematic diagram showing two mold holes horizontally positioned in the middle;

[0033] Figure 12 This is a cross-sectional view along the center line of the annular groove when the boot seat is horizontally set in an embodiment of the present invention;

[0034] Figure 13 for Figure 12 The enlarged view shows only parts of the bow-shaped sealing block, cavity, baffle block, mold, pressure plate, extrusion wheel, and shoe seat.

[0035] Explanation of reference numerals in the attached drawings: 1 is the extrusion roller, 2 is the stop block, 3 is the mold mounting surface, 4 is the mold, 5 is the arc-shaped sealing block, 6 is the cavity, 7 is the cavity cover, 8 is the annular groove, 9 is the arc surface of the arc-shaped sealing block, 10 is the main shaft, 11 is the bearing, 12 is the bearing housing, 13 is the frame, 14 is the compaction roller assembly, 15 is the scraper assembly, 16 is the shoe seat, 17 is the shoe seat pivot, 18 is the clamping device, 19 is the clamping device shaft, 20 is the first hydraulic cylinder, 21 is the pressure plate, 22 is the cavity sleeve, 23 is the mold cooling channel, 24 is the wheel surface, 25 is the sealing arc surface, and 26 is the extrusion roller. On the inner surface, 27 is the center line of the extrusion wheel parallel to the center line of the die hole, 28 is the center line of the die hole, 28-1 is the first center line of the extrusion product outlet of the double-hole die, 28-2 is the second center line of the extrusion product outlet of the double-hole die, 29 is the die hole, 30 is the groove symmetry plane, 31 is the baffle surface, 32 is the side plane of the opening end of the annular groove, 33 is the side plane of the baffle block, 34 is the side plane of the boss, 35 is the boss, 36 is the surface of the boss, 37 is the center line of the extrusion wheel passing through the starting point of the baffle surface, 38 is the expansion surface, 39 is the line connecting the starting point A and point B, and 40 is the second oil cylinder;

[0036] H is the vertical distance from the center line of the die hole to the center line of the extrusion wheel that is parallel to it;

[0037] H1 is the vertical distance from the center line of the product outlet of the double-hole extrusion die to the center line of the extrusion wheel, which is parallel to the center line of the die hole.

[0038] H2 is the vertical distance from the center line of the product outlet of the double-hole extrusion die to the center line of the extrusion wheel, which is parallel to the center line of the die hole.

[0039] β is the angle between the center line of the extrusion wheel at the starting point of the stop surface and the mold mounting surface;

[0040] θ is the angle between the line connecting the starting point A and point B and the center line of the mold hole;

[0041] γ is the complementary angle to β, and γ = 180° - β;

[0042] m is the vertical distance from the boss into the annular groove;

[0043] n is the height of the side plane at the opening end of the annular groove;

[0044] δ is the gap between the side plane of the boss and the side plane of the opening end of the annular groove;

[0045] w represents the width of the annular groove opening. Detailed Implementation

[0046] 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.

[0047] The purpose of this invention is to provide a continuous extrusion device for chordal extrusion, so as to solve the problems existing in the prior art, effectively reduce the extrusion load, and extend the service life of the die.

[0048] 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.

[0049] Example 1

[0050] like Figures 1-13As shown, this embodiment provides a continuous extrusion device for chordal extrusion, including a frame 13 and an extrusion wheel 1, a compaction wheel assembly 14, and a cavity 6 mounted on the frame 13. The extrusion wheel 1 is rotatably mounted on the frame 13 via a main shaft 10. Specifically, bearings 11 are provided at both ends of the main shaft 10 to support it. The bearings 11 are installed in bearing seats 12, which are mounted on the frame 13. The frame 13 is mounted on a base (not shown in the figure). An annular groove 8 is provided on the annular surface of the extrusion wheel 1. The compaction wheel assembly 14 is used to press the extrusion rod material into the annular groove 8 of the extrusion wheel 1. A baffle block 2 and a mold 4 are provided on the cavity 6. The baffle block 2 can block the extrusion rod material in the annular groove 8 so that it enters the mold 4. It should be noted that the above structure is a mature prior art in this field, and will not be described in detail in this embodiment.

[0051] In this embodiment, the material blocking surface 31 of the material blocking block 2 is connected to the mold mounting surface 3 away from the extrusion wheel 1. The mold 4 is embedded in the mounting hole or mounting groove on the mold mounting surface 3, and the center line 28 of the mold hole of the mold 4 is located in the chord direction of the extrusion wheel 1.

[0052] In this embodiment, the mold 4 is installed on the stop block 2, which minimizes the flow path of the extrusion rod material and reduces the friction between the extrusion rod material and the stop block 2 during the extrusion process. This effectively reduces the extrusion load and extends the service life of the device. Moreover, in this embodiment, the flow path of the extrusion rod material is changed from the approximately right-angle flow of traditional continuous extrusion to an obtuse-angle flow, which reduces the extrusion load. Compared with the traditional tangential extrusion where the stop block 2 is mostly under shear, the force state of the stop block 2 is changed to mostly unidirectional compression and a small part under shear. Therefore, it can reduce the damage caused by the stop block being mostly under shear, and further extend the service life of the device.

[0053] In this embodiment, the cavity 6 is mounted on the shoe seat 16, such as Figure 1 As shown, the shoe holder 16 is vertically arranged and rotatably mounted on the frame 13 via a shoe holder pivot 17. The shoe holder 16 and the shoe holder pivot 17 are connected by a spline. Both ends of the shoe holder pivot 17 are mounted on the frame 13. One end of the shoe holder pivot 17 is connected to a hydraulic motor (not shown in the figure). The rotation of the hydraulic motor drives the shoe holder 16 to open and close. The shoe holder 16 is locked during operation by a clamping device 18, which positions it on the frame 13. The clamping device 18 can rotate around a clamping device shaft 19 to ensure that the shoe holder 16 can be opened. Both ends of the clamping device shaft 19 are mounted on the frame 13. The opening and closing of the clamping device 18 are achieved by a first hydraulic cylinder 20, one end of which is connected to the clamping device 18, and the other end is connected to the frame 13.

[0054] In this embodiment, as Figure 2 As shown, the bearing 11 is preferably a cylindrical roller bearing, which makes it easy for the spindle system to move on the bearing housing 12, and facilitates the automatic alignment of the stop block 2 with the annular groove 8.

[0055] In this embodiment, as Figure 10 and Figure 11 As shown, a cooling water groove is provided on the inner surface 26 of the extrusion wheel (near the inner ring surface of the main shaft 10), which can be circulated with cooling water to cool the extrusion wheel 1, reduce its thermal expansion, and avoid wear caused by direct contact between the side plane 32 of the annular groove opening end and the side plane 33 of the baffle block due to thermal expansion.

[0056] In this embodiment, as Figure 1 and Figure 12 As shown, a scraper assembly 15 is also installed on the frame 13. The scraper assembly 14 is used to remove the overflow material from the surface 24 of the extrusion wheel.

[0057] In this embodiment, as Figure 12 As shown, another scheme for opening and closing the shoe seat 16 is given. The opening and closing of the shoe seat 16 is accomplished by the second hydraulic cylinder 40, and Figure 12 The document provides an alternative scheme for opening and closing the clamping device 18, which is achieved manually.

[0058] In this embodiment, as Figure 1 and Figure 12 As shown, when the β angle is large, the preferred method is... Figure 1 The equipment layout shown indicates that the shoe mount 16 is vertically positioned; when the β angle is small, the preferred method is... Figure 12 The equipment layout shown depicts a horizontally positioned shoe mount 16. This layout helps reduce clamping pressure and improves the mechanical strength of the equipment.

[0059] Alternatively, the shoe seat 16 can be arranged at an angle, and the main shaft 10 can be arranged either horizontally or vertically to the ground, forming a vertically arranged continuous extrusion device.

[0060] In this embodiment, as Figure 3 As shown, the cavity 6 is installed inside the cavity sleeve 22 within the shoe seat 16 (the cavity sleeve is within...) Figure 3 Not drawn in the middle, in Figure 1 (shown in the middle) A baffle block 2 is installed on the cavity 6, and a mold 4 is installed on the mold mounting surface 3. The cavity cover 7 fixes the baffle block 2 on the cavity 6. An arc-shaped sealing block 5 is installed at the front end of the cavity 6 (the end near the compaction wheel assembly 14). A pressure plate 21 is provided on the upper end of the arc-shaped sealing block 5 to fix the arc-shaped sealing block 5 and the cavity 6 on the shoe seat 16.

[0061] The purpose of setting the cavity sleeve 22 is to allow cooling water to be introduced into the cavity sleeve 22 to reduce the temperature of the baffle block 2 and the cavity 6. It also facilitates replacement if the cavity sleeve 22 is further damaged due to accidental damage to the baffle block 2.

[0062] In this embodiment, as Figures 3-5 and Figure 9 As shown, the part where the retaining block 2 and the annular groove 8 cooperate is shown. The retaining block 2 has a sealing arc surface 25, and the starting end of the sealing arc surface 25 is provided with a retaining surface 31. The retaining surface 31 is connected to the mold mounting surface 3. The mold mounting surface 3 is provided with holes or grooves for mounting the mold 4. The mold 4 is provided with a mold hole 29. The vertical distance from the center line 28 of the mold hole to the center line of the extrusion wheel parallel to it is H. The value of H ranges from (0.0868D+w) to (0.4981D+w), that is, (0.4981D+w)≥H≥(0.0868D+w). Figure 5 In the middle, two mold holes 29 can be set at the top and bottom. The vertical distances from the center line 1 28-1 of the mold double-hole extrusion product outlet and the center line 28-2 of the mold double-hole extrusion product outlet to the center line 27 of the extrusion wheel that is parallel to the center line of the mold hole are H1 and H2, respectively. The values ​​of H1 and H2 are in the range of (0.0868D+w) to (0.4981D+w); where w is the groove width of the annular groove and D is the diameter of the extrusion wheel.

[0063] In this embodiment, as Figures 3-5 and Figure 9 As shown, the angle between the center line 37 of the extrusion wheel passing through the starting point of the stop surface and the mold mounting surface 3 is β, and the range of angle β is 10°-85°.

[0064] In this embodiment, as Figures 3-5 and Figure 9 As shown, the sealing arc surface 25 of the retaining block 2 is connected to an expansion surface 38 at its rear end. The expansion surface 38 not only increases the shear support area of ​​the retaining block 2, but also effectively increases the heat dissipation area of ​​the retaining block 2, reducing the temperature of the retaining block 2 and thus improving its material strength. Therefore, the expansion surface 38 can effectively improve the strength of the retaining block 2. The expansion surface 38 can be an arc surface or a combination of an arc surface and a plane. A point B is set on the expansion surface 38 at a position 30mm outward from the starting point A. The angle between the line 39 connecting the starting point A and point B on the expansion surface and the center line of the mold hole is θ, and the value of θ ranges from β+3° to β+20°. When the expansion surface 38 is a plane, the expansion surface 38 coincides with the line 39 connecting the starting point A and point B on the expansion surface.

[0065] In this embodiment, as Figures 3-5As shown, a mold cooling channel 23 is provided in the cavity 6 and the baffle block 2 to introduce cooling medium into the end face of the mold 4, reduce the mold temperature, and improve the service life of the mold.

[0066] In this embodiment, as Figure 6 As shown, the bow-shaped sealing block 5 may not have a boss. The arc surface 9 of the bow-shaped sealing block and the wheel surface 24 of the extrusion wheel 1 have a certain gap, which is called the radial gap. This scheme uses the radial gap to control the overflow of the overflow material.

[0067] And such Figure 7 As shown, the bow-shaped sealing block 5 has a conventional boss 35. There is a certain gap between the side plane 34 of the boss and the side plane 32 of the opening end of the annular groove, which is called the axial gap. The depth of the boss 34 into the annular groove does not exceed 2.5mm. There is a certain gap between the arc surface 9 of the bow-shaped sealing block and the wheel surface 24 of the extrusion wheel 1, which is called the radial gap. This scheme uses both the axial gap and the radial gap to seal the overflow.

[0068] like Figure 8 and Figure 9 As shown, the cavity 6 and the arc-shaped sealing block 5 have bosses 35 extending into the annular groove 8. The two boss side planes 34 of the bosses 35 extend all the way to the mold mounting end face 3 of the baffle block. The gap between the boss side plane 34 and the annular groove opening end side plane 32 is δ, with a value between 0.001mm and 0.2mm. Within a range of no more than 30mm from the mold mounting surface 3 towards the arc-shaped sealing block 5, the vertical distance m from the bosses 35 into the annular groove 8 (i.e., the vertical distance from the boss surface 36 to the wheel surface 24 of the extrusion wheel 1) is no less than 3.5mm, and the height n of the annular groove opening end side plane 32 is no less than the value m. In this scheme, the gap between the annular groove opening end side plane 32 and the boss side plane 34 is used to seal the overflow, and the gap between the cavity 6 and the arc surface 9 of the arc-shaped sealing block and the extrusion wheel 1 serves as the overflow channel.

[0069] In this embodiment, as Figures 10-11 As shown, the gap between the side plane 33 of the baffle block and the side plane 32 of the opening end of the annular groove is also δ, with a value between 0.001 mm and 0.2 mm.

[0070] In this embodiment, the arc surface 9 of the bow-shaped sealing block can be composed of arc surfaces respectively provided on the bow-shaped sealing block 5, the baffle block 2, and the cavity 6. The boss surface 36 can be respectively provided on the cavity 6 and the bow-shaped sealing block 5, or the cavity 6 and the bow-shaped sealing block 5 can be set as a single integral part; wherein, the boss surface 36 can be an arc, or other curved surfaces, or a combination of curved surfaces and planes.

[0071] In this embodiment, the baffle block 2 can be manufactured as an integral part with the cavity 6. The disadvantage is that the entire cavity 6 is scrapped when the baffle block is damaged, which leads to increased production costs. The baffle block 2 can be composed of multiple separate parts.

[0072] In this embodiment, the mold mounting surface 3 can be a plane or a curved surface, and the mold mounting surface 3 is basically perpendicular to the center line 28 of the mold hole.

[0073] In this embodiment, as Figures 10-11 As shown, one mold hole 29 can be set on the mold 4 to extrude one product, or two mold holes 29 can be set horizontally to extrude two products at the same time. When two mold holes 29 are set horizontally, the product size of the two mold holes 29 should be the same, otherwise the extrusion speed of the two products will be very different. Alternatively, two mold holes 29 can be set vertically, or other numbers of mold holes 29 can be set according to specific work needs.

[0074] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0075] 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 apparatus for tangential extrusion, comprising a frame and an extrusion wheel, a compaction wheel assembly, and a cavity mounted on the frame, wherein the extrusion wheel is rotatably mounted on the frame via a spindle, the extrusion wheel has an annular groove, and the compaction wheel assembly is used to press the extrusion rod material into the annular groove of the extrusion wheel; the cavity is provided with a stop block and a die, the stop block being able to block the extrusion rod material in the annular groove so that it enters the die; characterized in that: The front end of the material blocking surface of the material blocking block is connected with a die mounting surface, the die is embedded on the die mounting surface, and a die hole center line of the die is located in the chord direction of the extrusion wheel; An angle between the extrusion wheel center line passing through the starting point of the material blocking surface and the die mounting surface is β, and 85°≥β≥10°; wherein the starting point of the material blocking surface is an end point of the material blocking surface on the cross section of the material blocking block and close to the extrusion wheel; the extrusion wheel center line passing through the starting point of the material blocking surface is collinear with an extension line of the material blocking surface on the cross section of the material blocking block; The material blocking block is further provided with a die cooling channel, one end of the die cooling channel extends out of the cavity, and the other end is close to the die to pass cooling medium into the die.

2. The continuous extrusion apparatus for chordwise extrusion of claim 1, wherein: One side of the material blocking block close to the groove bottom of the annular groove is a sealing arc surface, the rear end of the sealing arc surface is connected with an expansion surface, the expansion surface is provided with a point B at a position 30 mm behind the starting point A, the angle between the line connecting the starting point A and the point B and the die hole center line is θ, and β+20°≥θ≥β+3°; wherein the starting point A and the point B are located on the cross section of the material blocking block, the die hole center line is located on the cross section, and the starting point A is an end point close to the sealing arc surface.

3. The continuous extrusion apparatus for chordwise extrusion of claim 1, wherein: The vertical distance from the die hole center line to the extrusion wheel center line parallel to the die hole center line is H, and 0.4981D+w≥H≥0.0868D+w; wherein D is the diameter of the extrusion wheel, and w is the slot width of the annular groove.

4. The continuous extrusion apparatus for chordwise extrusion of claim 1, wherein: The front end of the cavity is provided with an arc-shaped sealing block, the cavity and the arc-shaped sealing block are provided with a boss on the side facing the extrusion wheel, and the boss can extend into the annular groove; the boss side planes on both sides of the boss extend to the die mounting surface and are flush with the material blocking block side planes of the material blocking block, and the gap between the boss side planes and the annular groove opening end side planes is δ, and δ is 0.001 mm-0.2 mm.

5. A continuous extrusion apparatus for chordwise extrusion as claimed in claim 4, characterised in that: In the range of not more than 30 mm in the direction of the die mounting surface to the arc-shaped sealing block, the vertical distance of the boss deep into the annular groove is m, m≥3.5 mm, the height of the annular groove opening end side plane is n, and n≥m.

6. A continuous extrusion apparatus for chordwise extrusion as claimed in claim 5, characterised in that: The boss surface of the boss is an arc surface, or the boss surface is a combination of an arc surface, a curved surface and a plane; The die mounting surface is a plane or a curved surface, or the die mounting surface is a combination of a plane and a curved surface.

7. The continuous extrusion apparatus for chordwise extrusion of claim 1, wherein: Two die holes are symmetrically arranged on the die along the groove symmetry plane of the annular groove, or two die holes are arranged on the die in an up-down manner.

8. The continuous extrusion apparatus for chordwise extrusion of claim 1, wherein: The cavity is mounted on a shoe base, the shoe base is pivotally mounted on the rack through a shoe base pivot, and the shoe base is connected with a driving device, the driving device can drive the shoe base to rotate; a locking device is also pivotally mounted on the rack, and the locking device can lock the shoe base; Wherein, the shoe base is horizontally arranged or vertically arranged.

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