Precision machining method and equipment for free-cutting steel bar

Abstract

The invention provides a precision machining method and equipment for a free-cutting steel bar, and relates to the technical field of steel bar machining, and the precision machining method comprises the following steps: S1, bidirectionally extruding a rolled material from a first direction and a second direction of the side surface of the rolled material, removing oxide skin on the surface of the rolled material, and forming extrusion marks on the surface of the rolled material; s2, continuously extruding the side surface of the rolled material by using a conical extrusion roller to form a strip-shaped concave area on the side surface of the rolled material; according to the invention, the processes of performing bidirectional extrusion on the rolled metal from the first direction and the second direction of the side surface of the rolled metal and continuously extruding the side surface of the rolled metal by using the conical extrusion roller are added before the drawing forming process, so that the oxide skin on the surface of the rolled metal can be well removed, and the influence of the oxide skin on the surface of the rolled metal on the subsequent drawing forming size is avoided; and the size and the surface quality of the formed free-cutting steel bar are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of steel bar processing, and particularly to a precision processing method and equipment for free-cutting steel bars. Background Art

[0002] Free-cutting steel bars are a type of steel that improves cutting performance by adding specific elements (such as sulfur, lead, calcium, etc.), and are widely used in the field of machining; their main characteristics include good machinability, high processing efficiency, and low tool wear. The chemical composition and properties of free-cutting steel bars vary depending on the added elements. For example, sulfur free-cutting steel improves cutting performance through sulfide inclusions, but may reduce transverse plasticity and toughness; while lead free-cutting steel reduces cutting force through the lubricating effect of lead.

[0003] Currently, the processing technology of free-cutting steel bars is to first perform rolling to form a rolled material of a certain size (coarser than the finished product), and then process it into a finished product that meets the dimensional requirements through a drawing (or cold drawing) process. However, since the surface layer of the rolled material has scale, and the plasticity and toughness of the rolled material are low, the traditional processing method of free-cutting steel bars is likely to result in poor quality and unstable dimensions of the steel bar finished product. Therefore, the present invention provides a precision processing method and equipment for free-cutting steel bars. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a precision processing method and equipment for free-cutting steel bars, which solves the problems that the traditional processing method of free-cutting steel bars is likely to result in poor quality and unstable dimensions of the steel bar finished product.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0006] A precision processing method for free-cutting steel bars includes the following steps:

[0007] S1. Bilaterally extrude the rolled material from the first direction and the second direction on the side of the rolled material to remove the scale on the surface of the rolled material and form extrusion marks on the surface of the rolled material;

[0008] S2. Continuously extrude the side of the rolled material using a conical extrusion roller to form a strip-shaped concave area on the side of the rolled material. The formula for calculating the thickness h of the strip-shaped concave area formed on the side of the rolled material is as follows:

[0009]

[0010] In formula ①, d represents the diameter of the free-cutting steel bar to be processed and formed, and D represents the diameter of the rolled material;

[0011] S3. Use a drawing die to form the free-cutting steel bar by a one-step drawing process. A guiding portion corresponding to the strip-shaped concave area formed on the side of the rolled material is provided in the drawing die;

[0012] In the steps S1, S2, and S3, a drawing machine is used to drive the movement of the rolled material.

[0013] Preferably, in step S1, the first direction and the second direction for two-way extrusion of the rolled material from the side of the rolled material are perpendicular to each other.

[0014] A precision machining device for free-cutting steel bars includes a base, and a guiding member, a two-way extrusion assembly, a pre-extrusion assembly, and a drawing die are sequentially arranged on the top of the base along the moving direction of the rolled material;

[0015] The pre-extrusion assembly forms a strip-shaped recessed area on the side of the rolled material;

[0016] A guiding portion corresponding to the strip-shaped recessed area formed on the side of the rolled material is arranged in the drawing die.

[0017] Preferably, the guiding member includes: a fixed guiding member and an anti-sway guiding member, and the anti-sway guiding member is located between the fixed guiding member and the two-way extrusion assembly;

[0018] The anti-sway guiding member includes:

[0019] An annular member, a transverse plate is fixedly connected to the side surface of the annular member, and a guiding hole is formed in the transverse plate;

[0020] A stepped column, the stepped column has a thick bottom section and a thin top section, the thin top section is slidably matched with the guiding hole, a spring is sleeved on the thin top section below the transverse plate, and a compression nut is threadedly connected to the thin top section above the transverse plate.

[0021] The present invention provides a precision machining method and device for free-cutting steel bars. The following beneficial effects are achieved:

[0022] 1. In the present invention, by adding a process of two-way extrusion of the rolled material from the first direction and the second direction on the side of the rolled material and continuously extruding the side of the rolled material with a conical extrusion roller before the drawing forming process, the scale on the surface of the rolled material can be well removed, and the influence of the scale on the surface of the rolled material on the subsequent drawing forming size can be avoided, ensuring the size and surface quality of the formed free-cutting steel bar; moreover, by continuously extruding the side of the rolled material with a conical extrusion roller, a strip-shaped recessed area is formed on the side of the rolled material, and a guiding portion corresponding to the strip-shaped recessed area formed on the side of the rolled material is arranged in the drawing die. During the process of forming the free-cutting steel bar by a single drawing forming process, the guiding portion is located inside the strip-shaped recessed area and is used to limit the circumferential rotation of the rolled material, avoiding the occurrence of wrinkled and overlapping parts on the side of the rolled material and affecting the surface quality of the free-cutting steel bar.

[0023] 2. In the present invention, a precision machining device for free-cutting steel bars is designed, which includes a base. Along the moving direction of the rolled material, a guide, a two-way extrusion assembly, a pre-extrusion assembly, and a drawing die are sequentially arranged on the top of the base. The guide is used to stabilize the rolled material. The two-way extrusion assembly is used to perform extrusion forging on the horizontal and vertical directions of the rolled material. The pre-extrusion assembly forms a strip-shaped recessed area on the side of the rolled material. A guiding portion corresponding to the strip-shaped recessed area formed on the side of the rolled material is arranged in the drawing die. When the rolled material moves forward, the guiding portion is located in the strip-shaped recessed area, thereby restricting the circumferential rotation of the rolled material and ensuring the surface quality and dimensional accuracy of the free-cutting steel bars during the drawing forming process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a perspective view of a precision machining device for free-cutting steel bars proposed by the present invention;

[0025] Figure 2 is a front view of a precision machining device for free-cutting steel bars proposed by the present invention;

[0026] Figure 3 is a top view of a precision machining device for free-cutting steel bars proposed by the present invention;

[0027] Figure 4 is a perspective view of the two-way extrusion assembly of a precision machining device for free-cutting steel bars proposed by the present invention;

[0028] Figure 5 is a cross-sectional view of the two-way extrusion assembly of a precision machining device for free-cutting steel bars proposed by the present invention;

[0029] Figure 6 is a schematic internal structure view of the two-way extrusion assembly of a precision machining device for free-cutting steel bars proposed by the present invention;

[0030] Figure 7 is a perspective view of the second-direction extrusion module of a precision machining device for free-cutting steel bars proposed by the present invention;

[0031] Figure 8 is a first-angle perspective view of the pre-extrusion assembly of a precision machining device for free-cutting steel bars proposed by the present invention;

[0032] Figure 9 is a transmission principle diagram inside the pre-extrusion assembly of a precision machining device for free-cutting steel bars proposed by the present invention;

[0033] Figure 10 is a second-angle perspective view of the pre-extrusion assembly of a precision machining device for free-cutting steel bars proposed by the present invention.

[0034] Among them, 1. Base; 2. Fixed guide; 3. Anti-swing guide; 301. Ring; 302. Horizontal plate; 303. Step column; 304. Spring; 305. Compression nut; 4. Bi-directional extrusion assembly; 401. Square cylinder; 402. Support; 403. First-direction extrusion module; 404. Second-direction extrusion module; 404a. Outer bracket; 404b. Arc-shaped frame; 404c. Guide; 404d. Wedge; 405. Bi-directional synchronous telescopic mechanism; 406. First connecting rod; 407. First sliding groove part; 408. Second connecting rod; 409. Second sliding groove part; 4010. Elastic part; 4011. External pressing plate; 5. Pre-extrusion assembly; 501. Ring seat; 501a. Central circular hole; 501b. Tapered hole; 502. Installation ring seat; 503. Rotating shaft; 504. Cone; 505. Gear ring; 506. First gear; 507. Driving motor; 508. Second gear; 6. Drawing die; 7. Rolled material. Detailed implementation mode

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] Embodiment 1:

[0037] The embodiment of the present invention provides a precision machining method for free-cutting steel bars, including the following steps:

[0038] S1. Bi-directionally extrude the rolled material from the first direction and the second direction on the side of the rolled material, perform forging treatment on the rolled material, remove the oxide scale on the surface of the rolled material, avoid affecting the subsequent drawing forming size due to the oxide scale on the surface of the rolled material, and ensure the size and surface quality of the formed free-cutting steel bar. During the forging treatment of the rolled material, extrusion marks will be formed on the surface of the rolled material, which helps to retain lubricating oil at the extrusion mark on the surface of the rolled material during the process of forming the free-cutting steel bar by the drawing forming process.

[0039] S2. Continuously extrude the side of the rolled material with a tapered extrusion roller to form a strip-shaped recessed area on the side of the rolled material. The first purpose of this process is to better perform the first drawing forming process to form the free-cutting steel bar; the second purpose is to cause deformation on the side of the rolled material to prevent some residual surface layers of the rolled material from falling off;

[0040] The formula for calculating the thickness h of the strip-shaped recessed area formed on the side of the rolled material is as follows:

[0041]

[0042] In formula ①, d represents the diameter of the free-cutting steel bar to be processed and formed, and D represents the diameter of the rolled material, that is, it meets the requirements for forming the free-cutting steel bar by the subsequent one-time drawing forming process, and the thickness h of the strip-shaped recessed area formed on the side of the rolled material should not be too large.

[0043] S3. Use a drawing die to form a free-cutting steel bar by a one-time drawing forming process. A guiding part corresponding to the strip-shaped recessed area formed on the side of the rolled material is arranged in the drawing die. During the process of forming the free-cutting steel bar by the one-time drawing forming process, the guiding part is located inside the strip-shaped recessed area and is used to limit the circumferential rotation of the rolled material, so as to avoid wrinkles and overlapping parts on the side of the rolled material, which may affect the surface quality of the free-cutting steel bar.

[0044] In the above steps S1, S2, and S3, a drawing machine is used to drive the movement of the rolled material. Specifically, a lathe is used to turn a stepped head at the head end of the rolled material for convenient clamping and pulling, and then the clamping part of the drawing machine is used to clamp and pass through the equipment for performing the above steps S1, S2, and S3 to drive the movement of the rolled material.

[0045] In an embodiment, in step S1, the rolled material is bilaterally extruded from the first direction and the second direction on the side of the rolled material, and the first direction and the second direction are perpendicular to each other, so that the side of the rolled material can be better forged. As the rolled material moves, continuous forging can be achieved.

[0046] Embodiment 2:

[0047] As Figures 1 - 10 shown, an embodiment of the present invention provides a precision processing equipment for free-cutting steel bars, including a base 1. The base 1 is in a long strip shape and is used to support each linearly distributed equipment. A guiding part, a bilateral extrusion assembly 4, a pre-extrusion assembly 5, and a drawing die 6 are sequentially arranged on the top of the base 1 along the moving direction of the rolled material 7. The guiding part is used to stabilize the rolled material 7, the bilateral extrusion assembly 4 is used to extrude and forge the rolled material 7 in the horizontal direction and the vertical direction, the pre-extrusion assembly 5 forms a strip-shaped recessed area on the side of the rolled material, and a guiding part corresponding to the strip-shaped recessed area formed on the side of the rolled material is arranged in the drawing die 6. When the rolled material 7 moves forward, the guiding part is located in the strip-shaped recessed area to limit the circumferential rotation of the rolled material 7, so as to ensure the surface quality and dimensional accuracy of the free-cutting steel bar when the free-cutting steel bar is formed by the drawing forming process.

[0048] In an embodiment, the guiding part includes a fixed guiding part 2 and an anti-swing guiding part 3. The anti-swing guiding part 3 is located between the fixed guiding part 2 and the bilateral extrusion assembly 4.

[0049] The coiled rolled material 7 is initially guided through the fixed guide 2, and then through the anti-sway guide 3 for secondary guidance before entering the two-way extrusion assembly 4. The annular part 301 of the anti-sway guide 3 can swing elastically up and down, avoiding excessive sway of the rolled material 7 when the two-way extrusion assembly 4 forges the rolled material 7, and can provide a certain sway space for the rolled material 7.

[0050] The anti-sway guide 3 includes: an annular part 301, a transverse plate 302, a stepped column 303, a spring 304, and a compression nut 305.

[0051] The side of the annular part 301 is fixedly connected with the transverse plate 302. A guide hole is opened on the transverse plate 302. The stepped column 303 has a thick bottom section and a thin top section. The stepped column 303 is fixedly installed on the base 1. There are two groups of stepped columns 303. The thick bottom section and the thin top section are an integral structure. A step is formed at the connection of the thick bottom section and the thin top section. The thin top section is slidably matched with the guide hole. A spring 304 is sleeved on the thin top section of the stepped column 303 and below the transverse plate 302. The bottom end of the spring 304 forms a step with the connection of the thick bottom section and the thin top section. A compression nut 305 is threadedly connected above the transverse plate 302 on the thin top section. During installation, the spring 304 is sleeved on the thin top section of the stepped column 303, and then the transverse plate 302 is put on (the thin top section is inserted into the guide hole opened on the transverse plate 302), and finally the compression nut 305 is threadedly installed. At this time, the annular part 301 can be elastically compressed downward.

[0052] In an embodiment, the two-way extrusion assembly 4 includes: a square cylinder 401, a first-direction extrusion module 403, a second-direction extrusion module 404, and a wedge-type driving module.

[0053] The square cylinder 401 is fixedly installed on the base 1 through the support 402 to ensure that the center height of the square cylinder 401 corresponds to the rolled material 7. The first-direction extrusion module 403 and the second-direction extrusion module 404 are arranged inside the square cylinder 401. The first-direction extrusion module 403 and the second-direction extrusion module 404 are distributed along the length direction of the rolled material 7. The first-direction extrusion module 403 and the second-direction extrusion module 404 are perpendicularly distributed. The wedge-type driving module is used to drive the first-direction extrusion module 403 and the second-direction extrusion module 404 to synchronously extrude the rolled material 7 inward.

[0054] During use, the rolled material 7 moves forward along the center of the square cylinder body 401. During the movement, the wedge - type driving module acts periodically, driving the first - direction extrusion module 403 and the second - direction extrusion module 404 to forge the side surfaces of the rolled material 7. This process is a continuous process and does not affect subsequent drawing forming. Since the first - direction extrusion module 403 and the second - direction extrusion module 404 are distributed along the length direction of the rolled material 7, every part of the rolled material 7 can be extruded by the first - direction extrusion module 403 and the second - direction extrusion module 404.

[0055] In one embodiment, the second - direction extrusion module 404 includes two groups of symmetric extrusion members, and the two groups of symmetric extrusion members synchronously extrude the rolled material 7 inward.

[0056] Specifically, the extrusion member includes: an outer bracket 404a, a wedge 404d is fixedly arranged on the outer side of the outer bracket 404a, a plurality of parallel - distributed arc - shaped frames 404b are fixedly connected to the inner side of the outer bracket 404a, guiding members 404c are fixedly installed on both sides of the wedge 404d on the outer side of the outer bracket 404a, and the guiding members 404c are slidably connected to the square cylinder body 401. Under the guiding action of the guiding members 404c, it can ensure the stable sliding of the outer bracket 404a. A plurality of parallel - distributed arc - shaped frames 404b are fixedly connected to the inner side of the outer bracket 404a, and the plurality of parallel - distributed arc - shaped frames 404b can extrude the rolled material 7 at multiple positions.

[0057] As Figure 6 shown, the first - direction extrusion module 403 and the second - direction extrusion module 404 have the same structure, and the directions of the first - direction extrusion module 403 and the second - direction extrusion module 404 are perpendicular to each other.

[0058] In one embodiment, an elastic member 4010 is fixedly connected to the outer side of the second - direction extrusion module 404, and an external pressing plate 4011 is fixedly connected to the end of the guiding member 404c located outside the square cylinder body 401. One end of the elastic member 4010 abuts against the inner side of the external pressing plate 4011, and the elastic force generated by the elastic member 4010 pushes the external pressing plate 4011, and then pushes the guiding member 404c to elastically slide outward. The design of this structure can enable the first - direction extrusion module 403 and the second - direction extrusion module 404 to automatically return to the outside. After one extrusion forging, the extrusion members of the first - direction extrusion module 403 and the second - direction extrusion module 404 can automatically slide outward, without affecting the movement of the rolled material 7.

[0059] In one embodiment, the wedge - type driving module includes: a two - way synchronous telescopic mechanism 405, a first connecting rod 406, a second connecting rod 408, a first sliding groove member 407, and a second sliding groove member 409.

[0060] The bidirectional synchronous telescopic mechanism 405 is fixedly connected to the square cylinder 401. There are four bidirectional synchronous telescopic mechanisms 405, and the four bidirectional synchronous telescopic mechanisms 405 are distributed at the four corner positions of the square cylinder 401. The two ends of the bidirectional synchronous telescopic mechanism 405 are respectively fixedly connected with a first connecting rod 406 and a second connecting rod 408. The bidirectional synchronous telescopic mechanism 405 drives the first connecting rod 406 and the second connecting rod 408 to move synchronously towards the outside or synchronously towards the inside. One end of the first sliding groove member 407 is fixedly connected to the first connecting rod 406, so that the first sliding groove member 407 moves with the first connecting rod 406. The outside of the first sliding groove member 407 is in sliding fit with the inside of the second connecting rod 408. The second connecting rod 408 is relied on to limit the first sliding groove member 407 from deforming towards the outside. The inside of the first sliding groove member 407 is in fit with the wedge block of the outer bracket of the extruding member of the first-direction extrusion module 403. When the first sliding groove member 407 and the wedge block of the outer bracket of the extruding member of the first-direction extrusion module 403 are in relative sliding fit, the extruding member of the first-direction extrusion module 403 is pushed inwards by relying on the cooperation of the inclined surface on the inside of the first sliding groove member 407 and the inclined surface of the wedge block of the outer bracket of the extruding member of the first-direction extrusion module 403, so that the extruding member of the first-direction extrusion module 403 squeezes the rolled material 7 inwards; One end of the second sliding groove member 409 is fixedly connected to the second connecting rod 408, so that the second sliding groove member 409 moves together with the second connecting rod 408. The outside of the second sliding groove member 409 is in sliding fit with the inside of the first connecting rod 406. The first connecting rod 406 is used to limit the second sliding groove member 409 from deforming outwards. The inside of the second sliding groove member 409 is in fit with the wedge block 404d of the outer bracket 404a of the extruding member of the second-direction extrusion module 404. When the second sliding groove member 409 slides relative to the wedge block 404d, it is used to push the outer bracket 404a and the arc-shaped bracket 404b towards the inside to slide, so that the extruding member of the second-direction extrusion module 404 squeezes the rolled material 7 inwards.

[0061] In one embodiment, the bidirectional synchronous telescopic mechanism 405 includes two groups of hydraulic telescopic rods. The tails of the two groups of hydraulic telescopic rods are arranged oppositely, and the two groups of hydraulic telescopic rods are fixedly installed on the same L-shaped bracket. The two groups of hydraulic telescopic rods are controlled by a synchronous hydraulic valve, so that the two groups of hydraulic telescopic rods extend and retract synchronously. As reflected in the overall bidirectional synchronous telescopic mechanism 405, the two ends of the bidirectional synchronous telescopic mechanism 405 extend or retract synchronously.

[0062] In one embodiment, the pre-extrusion assembly 5 includes: an annular seat 501, a mounting ring seat 502, a rotating shaft 503, a gear ring 505, and a driving motor 507.

[0063] The annular seat 501 is fixedly installed with the base 1. The annular seat 501 is a casting. A central circular hole 501a is provided at the center of the annular seat 501. A plurality of tapered holes 501b communicating with the central circular hole 501a are provided on the annular seat 501 and outside the central circular hole 501a. There are three groups of tapered holes 501b, and the three groups of tapered holes 501b are distributed in a circular array. The mounting ring seat 502 is fixedly connected to one end of the annular seat 501 facing the double-sided extrusion assembly 4 through a short column. The number of the rotating shafts 503 is the same as the number of the tapered holes 501b. The rotating shafts 503 are located in the tapered holes 501b, and a cone 504 is fixedly installed on the rotating shafts 503. One end of the rotating shaft 503 is rotatably installed with the mounting ring seat 502, and a first gear 506 is fixedly installed at the other end of the rotating shaft 503. The toothed ring 505 is rotatably installed at one end of the annular seat 501 facing the drawing die 6, and the toothed ring 505 meshes with the first gear 506. The rotation of the toothed ring 505 synchronously drives the rotation of a plurality of first gears 506, that is, a plurality of rotating shafts 503 and a plurality of tapered holes 501b rotate synchronously. The driving motor 507 is fixedly installed with the annular seat 501, and a second gear 508 is fixedly installed on the output shaft of the driving motor 507. The second gear 508 meshes with the toothed ring 505.

[0064] During operation, the driving motor 507 directly drives the second gear 508 to rotate. The second gear 508 meshes with the toothed ring 505 to drive the toothed ring 505 to rotate. The toothed ring 505 meshes with a plurality of first gears 506, thereby driving a plurality of rotating shafts 503 and a plurality of tapered holes 501b corresponding to the plurality of first gears 506 to rotate synchronously.

[0065] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for precision machining of a free-cutting steel bar, characterized in that: The following steps are involved: S1, bidirectionally extruding the rolled material from a first direction and a second direction on the side of the rolled material, removing the oxide scale on the surface of the rolled material, and forming an extrusion mark on the surface of the rolled material; S2, using a conical extrusion roller to continuously extrude the side of the rolled material to form a strip-shaped concave area on the side of the rolled material; S3, using a drawing die to form a free-cutting steel rod using a one-step drawing forming process, wherein a guide portion corresponding to a strip-shaped recessed area formed on a side of the rolled material is provided in the drawing die; The steps S1, S2 and S3 all use a drawing machine to drive the rolled material to move.

2. The method for precision machining of a free-cutting steel bar according to claim 1, characterized in that: In the step S1, bidirectional extrusion is performed from a first direction and a second direction on the side of the rolled material, and the first direction of the rolled material is perpendicular to the second direction.

3. A precision machining device for free-cutting steel bars, comprising a base (1), characterized in that: A guide member, a bidirectional extrusion assembly (4), a pre-extrusion assembly (5) and a drawing die (6) are sequentially arranged on the top of the base (1) and along the moving direction of the rolled material (7); The pre-extrusion assembly (5) forms a strip-shaped recessed area on the side of the rolled material; A guide portion corresponding to the strip-shaped recessed area formed on the side of the rolled material is arranged inside the drawing die (6).

4. The precision machining equipment for free-cutting steel bars according to claim 3, characterized in that: The guide member comprises: a fixed guide member (2) and an anti-swing guide member (3), wherein the anti-swing guide member (3) is located between the fixed guide member (2) and the bidirectional extrusion assembly (4).

5. The precision machining equipment for free-cutting steel bars according to claim 3, characterized in that: The guide member comprises: The anti-sway guide member (3) comprises: An annular member (301), a side surface of the annular member (301) being fixedly connected to a horizontal plate (302), and a guide hole being formed on the horizontal plate (302); The step column (303) has a bottom thick section and a top thin section, the top thin section is slidably matched with the guide hole, a spring (304) is sleeved on the top thin section and located below the cross plate (302), and a clamping nut (305) is threadedly connected on the top thin section and located above the cross plate (302).

6. The precision machining equipment for free-cutting steel bars according to claim 3, characterized in that: The bidirectional extrusion assembly (4) comprises: A square cylinder (401) is fixedly mounted on a base (1) via a support member (402).

7. The precision machining equipment for free-cutting steel bars according to claim 6, characterized in that: The bidirectional extrusion assembly (4) comprises: a first direction extrusion module (403) and a second direction extrusion module (404) are arranged inside the square cylinder (401); the first direction extrusion module (403) and the second direction extrusion module (404) are distributed along the length direction of the rolled material (7); the first direction extrusion module (403) and the second direction extrusion module (404) are distributed vertically; A wedge-type driving module is used to drive the first direction extrusion module (403) and the second direction extrusion module (404) to synchronously extrude the rolled material (7) inwards.

8. The precision machining equipment for free-cutting steel bars according to claim 7, characterized in that: The wedge-type drive module comprises: A bidirectional synchronous telescopic mechanism (405), wherein the bidirectional synchronous telescopic mechanism (405) is fixedly connected to the square cylinder (401), and two ends of the bidirectional synchronous telescopic mechanism (405) are respectively fixedly connected to a first connecting frame (406) and a second connecting frame (408); A first sliding groove member (407), one end of which is fixedly connected to the first connecting frame (406), the outer side of the first sliding groove member (407) is slidably matched with the inner side of the second connecting frame (408), and the inner side of the first sliding groove member (407) is matched with the wedge block of the outer bracket of the extrusion member of the first direction extrusion module (403); 9. The precision machining equipment for free-cutting steel bars according to claim 8, characterized in that: A second sliding groove member (409), one end of which is fixedly connected to the second connecting frame (408), the outer side of the second sliding groove member (409) is slidably matched with the inner side of the first connecting frame (406), and the inner side of the second sliding groove member (409) is matched with the wedge block (404d) of the outer bracket (404a) of the extrusion member of the second direction extrusion module (404).

10. The precision machining equipment for free-cutting steel bars according to claim 8, characterized in that: The bidirectional synchronous telescopic mechanism (405) comprises two groups of hydraulic telescopic rods, the tails of the two groups of hydraulic telescopic rods are arranged opposite to each other, and the two groups of hydraulic telescopic rods are fixedly mounted on the same L-shaped bracket.

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