A secondary rolling plug for rolling non-ferrous seamless tubes and a rolling mill

Abstract

The application relates to a secondary rolling plug for rolling non-ferrous metal seamless pipes and a rolling mill, a pipe-throwing section, a rounding section, a wall-reducing and uniformizing section, a compression and rotary rolling section, a contact biting section and a contact section are sequentially formed from right to left on the plug body, and the outer sides of the pipe-throwing section, the rounding section, the wall-reducing and uniformizing section, the compression and rotary rolling section, the contact biting section and the contact section are all rotary surfaces with the axis of the plug body as the axis. The surface shape of the plug body is designed, the surface of the non-ferrous metal pipe is not easily scratched, and the technical problems that the conventional three-roller rolling mill roll shape cannot realize biting and rotating, is stuck in rolling and smoothly throws the pipe when rolling the non-ferrous metal are solved.

Description

Technical Field

[0001] This invention relates to the field of non-ferrous metal processing, and in particular to a secondary rolling mandrel and rolling mill for rolling seamless non-ferrous metal tubes. Background Technology

[0002] The rolling process for non-ferrous metals in seamless tube production has higher technical requirements than the traditional rolling process for ferrous seamless tubes. Existing auxiliary tools on three-roll mills are prone to scratching and causing scabs on the surface of non-ferrous metals during processing. Summary of the Invention

[0003] The present invention aims to solve the above-mentioned problems by providing a secondary rolling mandrel and rolling mill for rolling seamless tubes of non-ferrous metals, thereby solving the aforementioned problems.

[0004] A secondary rolling mandrel for rolling seamless non-ferrous metal tubes, wherein the mandrel body is formed from right to left as follows: tube throwing section, rounding section, wall reduction and equalization section, compression and rotary rolling section, contact biting section and contact section. The outer surfaces of the tube throwing section, rounding section, wall reduction and equalization section, compression and rotary rolling section, contact biting section and contact section are all rotational surfaces with the axis of the mandrel body as the axis.

[0005] Furthermore, the generatrices of the outer surfaces of the contact biting section, the compression rotary rolling section, and the wall reduction and equalization section are straight lines, and the angle between the generatrices of the outer surfaces of the contact biting section, the compression rotary rolling section, and the wall reduction and equalization section and the axis gradually decreases.

[0006] Furthermore, the generatrices of the throwing section and the contact section are circular arcs. The generatrices of the throwing section are tangent to the right end face of the top head body, and the generatrices of the contact section are tangent to the left end face of the top head body.

[0007] Furthermore, the generatrix of the circular segment is a straight line or a circular arc, and the generatrix of the circular segment is tangent to the tube segment.

[0008] Furthermore, the top body also forms a straight section, which is located between the rounding section and the wall reduction and equalization section. The generatrix of the straight section is parallel to the axis, and the two ends of the generatrix of the straight section intersect with the generatrix of the rounding section and the wall reduction and equalization section, respectively.

[0009] Furthermore, the length ratios of the tube throwing section, the rounding section, the straightening section, the wall reduction and equalization section, the compression and rotary rolling section, the contact biting section, and the contact section along the axial direction are: 1-1.6: 1.67-2.92: 0.67-1.25: 11.00-11.25: 12.67-13.75: 2.34-3.33: 2.66-2.92.

[0010] Furthermore, the length ratio of the tube throwing section, the rounding section, the straightening section, the wall reduction and equalization section, the compression and rotary rolling section, the contact biting section, and the contact section along the axial direction is: 1:1.67:0.67:11.00:12.67:2.34:2.66.

[0011] Furthermore, the angles between the generatrices of the tube-throwing section, the circular section, and the wall-reducing and uniformly integrated section and the axis are 3.52°-4.75°, 8°-12°, and 25°-38°, respectively.

[0012] Furthermore, the angles between the generatrices of the tube-throwing section, the circular section, and the wall-reducing and uniformly integrated section and the axis are 4°, 10°, and 25°, respectively.

[0013] A rolling mill using the aforementioned secondary rolling mandrel for rolling seamless non-ferrous metal tubes further includes rollers arranged circumferentially about the axis of the mandrel body.

[0014] The present invention has the following advantages: through the surface shape design of the mandrel body, it is not easy to scratch the surface of non-ferrous metal tubes, and it solves the technical problems that conventional three-roll mill rolls cannot achieve bite rotation, jamming during rolling, and smooth tube throwing when rolling non-ferrous metals. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention. For those skilled in the art, other embodiments can be derived from the provided drawings without creative effort.

[0016] Figure 1 : Front sectional view along the axis of the secondary rolling mandrel;

[0017] Figure 2 :exist Figure 1 A magnified view of a section at point C;

[0018] Figure 3 :exist Figure 1 A magnified view of a section at point B in the middle;

[0019] Figure 4 :exist Figure 1 A magnified view of a section at point A in the middle;

[0020] Figure 5 : A three-dimensional view of the secondary rolling mandrel;

[0021] Figure 6 : A three-dimensional view of the mandrel and mandrel in the secondary rolling process;

[0022] Figure 7 : A sectional view of the mandrel and mandrel in the secondary rolling process;

[0023] Figure 8 : Side view of the rolling mill structure. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and examples:

[0025] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] like Figures 1 to 7 As shown, a secondary rolling mandrel for rolling seamless non-ferrous metal tubes has a mandrel body 1 consisting of a tube-throwing section 11, a rounding section 12, a wall-reducing and equalizing section 13, a compression and rotary rolling section 14, a contact biting section 15, and a contact section 16, arranged sequentially from right to left. The outer surfaces of the tube-throwing section 11, the rounding section 12, the wall-reducing and equalizing section 13, the compression and rotary rolling section 14, the contact biting section 15, and the contact section 16 are all surfaces of rotation about the axis d of the mandrel body 1.

[0029] Furthermore, the generatrices of the outer surfaces of the contact biting section 15, the compression rotary rolling section 14, and the wall reduction and equalization section 13 are straight lines, and the angle between the generatrices of the outer surfaces of the contact biting section 15, the compression rotary rolling section 14, and the wall reduction and equalization section 13 and the axis d gradually decreases.

[0030] Preferably, the two ends of the compression rotary rolling section 14 are respectively formed with a second fillet 19 and a first fillet 18 between the contact biting section 15 and the wall reduction and equalization section 13.

[0031] Furthermore, the generatrices of the throwing section 11 and the contact section 16 are circular arcs. The generatrices of the throwing section 11 are tangent to the right end face of the top body 1, and the generatrices of the contact section 16 are tangent to the left end face of the top body 1.

[0032] Furthermore, the generatrix of the circular segment 12 is a straight line or a circular arc, and the generatrix of the circular segment 12 is tangent to the tube segment 11.

[0033] Furthermore, the top body 1 also forms a straight section 17, which is located between the rounding section 12 and the wall reduction and equalization section 13. The generatrix of the straight section 17 is parallel to the axis d, and the two ends of the generatrix of the straight section 17 intersect with the generatrix of the rounding section 12 and the wall reduction and equalization section 13, respectively.

[0034] Furthermore, the length ratios of the tube-throwing section 11, the rounding section 12, the straightening section 17, the wall-reducing and leveling section 13, the compression rotary rolling section 14, the contact biting section 15, and the contact section 16 along the axial direction d are: 1-1.6: 1.67-2.92: 0.67-1.25: 11.00-11.25: 12.67-13.75: 2.34-3.33: 2.66-2.92. It should be noted that half of the rounded corners at both ends of the compression rotary rolling section 14 lies within the length of the compression rotary rolling section 14, while the other half lies within the length of another section.

[0035] Furthermore, the optimal length ratio of the tube throwing section 11, the rounding section 12, the straightening section 17, the wall reduction and equalization section 13, the compression and rotary rolling section 14, the contact biting section 15, and the contact section 16 along the axis d is: 1:1.67:0.67:11.00:12.67:2.34:2.66.

[0036] Furthermore, the angles between the generatrices of the tube-throwing section 11, the rounding section 12, and the wall-reducing and equalizing section 13 and the axis d are 3.52°-4.75°, 8°-12°, and 25°-38°, respectively. The design of the curved surface angle enables the tube body to extend, expand in diameter, reduce wall thickness, and improve the surface quality accuracy of the inner tube body during the rolling process.

[0037] Furthermore, the optimal angles between the generatrices of the tube-throwing section 11, the circular section 12, and the wall-reducing and uniformly integrated section 13 and the axis d are 4°, 10°, and 25°, respectively.

[0038] Furthermore, the left side of the top body 1 is provided with a channel for supplying lubricating oil and / or cooling water. The lubricating oil serves a lubricating function, while the cooling water serves a cooling function.

[0039] Optionally, such as Figure 1 As shown, a through hole 10 is formed on the left side of the mandrel body 1, and the left side of the inner cavity 100 of the mandrel body 1 is connected to the through hole 10. Lubricating oil and / or cooling water are sprayed out from the through hole 10 into the rough tube being rolled after passing through the inner cavity 100.

[0040] Optionally, such as Figures 5 to 7 As shown, the left end face of the mandrel body 1 is fixedly connected to the mounting block 2. The mounting block 2 is equipped with a nozzle 21. The mounting block 2 is connected to the nozzle 21 and the conveying pipe 6 respectively. The conveying pipe 6 is inserted into the inner cavity 100 of the mandrel body 1. Lubricating oil and / or cooling water are sprayed from the nozzle 21 into the rough tube being rolled after passing through the conveying pipe and the mounting block 2 in sequence.

[0041] When the mandrel body 1 outputs lubricating oil, the self-lubricating system is applied in the secondary piercing process of hot-rolled seamless metal tubes. Its advantages include achieving greater metal elongation and extension coefficients. It improves the density of the metal material structure, solves the problems of numerous internal surface defects and spiral marks during mandrel rolling, and addresses internal roughness and quality issues caused by secondary oxidation during large-scale elongation. During rolling, the self-lubricating system sprays lubricating fluid to isolate harmful gases in the air from the influence of these gases on the matrix composition of non-ferrous titanium, cleans the oxide layer, and forms an anti-oxidation film.

[0042] Furthermore, the non-ferrous metals are titanium alloys TC4, Ti80, and Ti75.

[0043] Furthermore, the radius of the fillet on the right side of the compression rotary rolling section 14 is 30mm to 50mm, the radius of the fillet on the left side of the compression rotary rolling section 14 is 40mm to 60mm, and the radius of the fillet on the contact section 16 is 50mm to 80mm.

[0044] The functions of the following sections are as follows: Section 11 (throwing section 11) ensures the smooth separation of the rough tube from the mandrel body 1 after rolling; Section 12 (rounding section 12) ensures the roundness of the rough tube's outer diameter during rolling, meeting the quality requirements; Section 17 (straightening section 17) ensures smooth rounding of the tube and quality control of the wall thickness during rolling; Section 13 (wall reduction and equalization section 13) increases the wall thickness, expands the outer diameter, and evens the inner surface during the rolling process from solid billet to tube; Section 14 (compression and rotary rolling section 14) loosens the center of the billet, allowing it to rotate and advance; Section 15 (contact and bite section 15) enables the billet to overcome the resistance of the mandrel, facilitating smooth bite-in before the next rolling step; and Section 16 (contact section 16) facilitates contact between the billet and the top of the mandrel body 1 and guides the billet.

[0045] like Figures 1 to 8 As shown, a rolling mill using the aforementioned secondary rolling mandrel for rolling seamless non-ferrous metal tubes further includes rollers 3, which are arranged circumferentially around the axis d of the mandrel body 1.

[0046] Furthermore, the angle between the axis d of the top body 1 and the rotation axis of the roller 3 is in the range of 6°~9°.

[0047] Furthermore, during the production rolling process, the rolling of the mandrel body 1 is floating rolling, that is, the mandrel body 1 can only rotate around the axis d.

[0048] Furthermore, the top head body 1 is fixedly connected to the top rod 4, and the top rod 4 is connected to the top rod trolley through the top rod tail 5.

[0049] Preferably, it also includes a connecting cylinder 9, the two ends of which are threadedly connected to the top head body 1 and the top rod 4, respectively.

[0050] Preferably, it also includes a support frame 7, which is located inside the top rod 4, with the outer side of the support frame 7 contacting the inner wall of the top rod 4, and the conveying pipe 6 passing through the inner hole of the support frame 7.

[0051] Preferably, it further includes a positioning block 8, which is inserted into the push rod tail shank 5, and the delivery pipe 6 passes through the push rod tail shank 5.

[0052] Furthermore, the number of rollers 3 is three, and the three rollers 3 are evenly arranged in a circle.

[0053] Preferably, the rolling mill can be the rolling mill disclosed in Chinese Patent Publication No. CN114425564B. Specifically, the tube-throwing section 11 and the rounding section 12 correspond to the contact-biting section of the Chinese patent rolls; the straightening section 17 corresponds to the rotary rolling section of the Chinese patent rolls; the wall-reducing and equalizing section 13 corresponds to the rotary rolling section of the Chinese patent rolls; the compression rotary rolling section 14 corresponds to the equalizing section of the Chinese patent rolls; the contact-biting section 15 corresponds to the equalizing section of the Chinese patent rolls; and the contact section 16 corresponds to the rounding section and tube-throwing section of the Chinese patent rolls. Through the equalizing, equalizing, and rounding sections of the three rolls 3, the three-roll mill achieves effective metal compression and flow during rolling by micro-aggregation and the curved surface of the mandrel body 1, realizing stable rolling of non-ferrous metals. The mandrel body 1 conforms to the plastic characteristics of non-ferrous metals, and the deformation distribution of the designed secondary rolling mandrel curved surface effectively solves the technical problem of the tail triangle at the tube end. During operation, the tube first contacts and bites into the roll 3 of the three-roll mill. Then, the non-ferrous metal tube is driven to rotate and move towards the tube ejection section. The outer surface of the non-ferrous metal tube rotates through the rolling section, the grading section, the leveling section and the rounding section in sequence, and is then ejected from the tube ejection section of the three-roll mill.

[0054] It should be noted that the rolling mill in this application can be other two-roll or three-roll rolling mills in the prior art.

[0055] During processing, the rough tube moves from left to right, the axial position of the mandrel body 1 is fixed, and the roller 3 rotates to roll the rough tube.

[0056] The present invention has been described above by way of example, but the present invention is not limited to the specific embodiments described above. Any modifications or variations made based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A secondary rolling mandrel for rolling non-ferrous seamless tubes, characterized in that: The top head body (1) is sequentially formed with a throw tube section (11), a rounding section (12), a wall-reducing uniformity collecting section (13), a compression rotary rolling section (14), a contact biting section (15) and a contact section (16) from right to left, and the outer side surfaces of the throw tube section (11), the rounding section (12), the wall-reducing uniformity collecting section (13), the compression rotary rolling section (14), the contact biting section (15) and the contact section (16) are all rotary surfaces with the axis (d) of the top head body (1) as the axis; The generatrices of the outer side surfaces of the contact biting section (15), the compression rotary rolling section (14) and the wall-reducing uniformity collecting section (13) are straight lines, and the included angles between the generatrices of the outer side surfaces of the contact biting section (15), the compression rotary rolling section (14) and the wall-reducing uniformity collecting section (13) and the axis (d) gradually decrease. The top head body (1) is further formed with a straight section (17), the straight section (17) is located between the rounding section (12) and the wall-reducing uniformity collecting section (13), the generatrices of the straight section (17) are parallel to the axis (d), and the generatrices of the straight section (17) are respectively intersected with the generatrices of the rounding section (12) and the wall-reducing uniformity collecting section (13).

2. A secondary rolling plug for rolling non-ferrous seamless tubes according to claim 1, characterized in that: The generatrices of the throw tube section (11) and the contact section (16) are circular arcs, the generatrices of the throw tube section (11) are tangent to the right end surface of the top head body (1), and the generatrices of the contact section (16) are tangent to the left end surface of the top head body (1).

3. A secondary rolling plug for rolling non-ferrous seamless tubes according to claim 2, characterized in that: The generatrices of the rounding section (12) are straight lines or circular arcs, and the generatrices of the rounding section (12) are tangent to the generatrices of the throw tube section (11).

4. A secondary rolling plug for rolling non-ferrous seamless tubes according to claim 1, characterized in that: The length ratio of the throw tube section (11), the rounding section (12), the straight section (17), the wall-reducing uniformity collecting section (13), the compression rotary rolling section (14), the contact biting section (15) and the contact section (16) in the direction along the axis (d) is: 1-1.6:1.67-2.92:0.67-1.25:11.00-11.25:12.67-13.75:2.34-3.33:2.66-2.

92.

5. A secondary rolling plug for rolling non-ferrous seamless tubes according to claim 4, characterized in that: The length ratio of the throw tube section (11), the rounding section (12), the straight section (17), the wall-reducing uniformity collecting section (13), the compression rotary rolling section (14), the contact biting section (15) and the contact section (16) in the direction along the axis (d) is: 1:1.67:0.67:11.00:12.67:2.34:2.

66.

6. A secondary rolling plug for rolling non-ferrous seamless tubes according to claim 1, characterized in that: The included angles between the generatrices of the wall-reducing uniformity collecting section (13), the compression rotary rolling section (14) and the contact biting section (15) and the axis (d) are respectively: 3.52°-4.75°, 8°-12° and 25°-38°.

7. A secondary rolling plug for rolling non-ferrous seamless tubes according to claim 6, characterized in that: The included angles between the generatrices of the wall-reducing uniformity collecting section (13), the compression rotary rolling section (14) and the contact biting section (15) and the axis (d) are respectively: 4°, 10° and 25°.

8. A rolling mill using the secondary rolling plug for rolling non-ferrous seamless pipes according to any one of claims 1 to 7, characterized in that: Further comprising a roller (3), the roller (3) is circularly arranged with the axis (d) of the top head body (1) as the axis.

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