Secondary rolling plug for rolling seamless tube

Abstract

The utility model relates to a secondary rolling plug for rolling a seamless tube, which is characterized in that a pipe throwing section, a rounding section, a wall-reducing uniform integrated transformation section, a compression rotating rolling section, a contact biting section and a contact section are sequentially formed on a plug body from right to left; and the outer side surfaces of the pipe throwing section, the rounding section, the wall reduction uniform integrated transformation section, the compression rotating rolling section, the contact biting section and the contact section are all revolution surfaces taking the axis of the plug body as the axis. Through the design of the surface shape of the top body, the surface of a non-ferrous metal tube is not easily scratched, and the technical problems that the roll shape of a conventional three-high rolling mill cannot realize biting rotation, clamping in the rolling process and smooth tube throwing in the non-ferrous metal rolling process are solved; when the plug body outputs lubricating oil, large metal extension and extension coefficients are achieved, the compactness of metal material structures is improved, the problems of multiple inner surface defects and spiral traces in the core rod rolling process are solved, and the quality problems caused by inner pitted surfaces and secondary oxidation in the large extension process are solved through a self-lubricating system.

Description

Technical Field

[0001] This utility model relates to the field of non-ferrous metal processing, and in particular to a secondary rolling mandrel for rolling seamless 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 rolling mill auxiliary tools are prone to scratching and causing scabs on the surface of non-ferrous metals during processing. Furthermore, existing rolling mills allow for oxidation and the intrusion of harmful components onto the tube surface, affecting the microstructure and composition of the non-ferrous metal material during processing. Utility Model Content

[0003] The present invention aims to solve the above problems by providing a secondary rolling mandrel for rolling seamless tubes, which solves the aforementioned problems.

[0004] A secondary rolling mandrel for rolling seamless tubes has the following components formed sequentially from right to left: a tube throwing section, a rounding section, a wall reduction and equalization section, a compression and rotary rolling section, a contact biting section, and a 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 surfaces of revolution about the axis of the mandrel body.

[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] Furthermore, a through hole is formed on the left side of the top head body, and the left side of the inner cavity of the top head body is connected to the through hole.

[0014] This utility model 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, which solves the technical problems of conventional three-roll mill rolls being unable to achieve biting rotation, jamming during rolling, and smooth tube throwing when rolling non-ferrous metals; when the mandrel body outputs lubricating oil, it achieves a large metal elongation and elongation coefficient, improves the density of the metal material structure, solves the problem of many internal surface defects and spiral marks during mandrel rolling, and the self-lubricating system solves the quality problems caused by internal pitting and secondary oxidation during the large elongation process. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. 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 A in the middle;

[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 C;

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

[0021] The present invention will be further described below with reference to the accompanying drawings and examples:

[0022] The embodiments of this utility model 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 this utility model, and should not be construed as limiting this utility model.

[0023] In the description of this utility model, 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 utility model based on the specific circumstances.

[0024] In the description of this utility model, 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 utility model 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 utility model.

[0025] like Figures 1 to 5 As shown, a secondary rolling mandrel for rolling seamless tubes has a mandrel body 1 consisting of a tube throwing section 11, a rounding section 12, a wall reduction and equalization 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, rounding section 12, wall reduction and equalization section 13, compression and rotary rolling section 14, contact biting section 15, and contact section 16 are all surfaces of rotation about the axis d of the mandrel body 1.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Furthermore, such as Figure 2 As shown, a through hole 10 is formed on the left side of the mandrel body 1. 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. The lubricating oil serves a lubricating function, and the cooling water serves a cooling function.

[0036] Preferably, the outlet of the through hole 10 is located in the contact section 16.

[0037] 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.

[0038] Furthermore, the non-ferrous metals are titanium alloys TC4, Ti80, and Ti75.

[0039] 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.

[0040] 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.

[0041] During processing, the rough tube moves from left to right, the axial position of the mandrel body 1 is fixed, and the rollers of the rolling mill are arranged in a circle around the mandrel body 1 and rotate to roll the rough tube. 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 as the rotation axis.

[0042] 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 seamless tubes, characterized in that: The mandrel body (1) is formed from right to left as follows: a tube throwing section (11), a rounding section (12), a wall reduction and equalization section (13), a compression and rotary rolling section (14), a contact biting section (15), and a contact section (16). The outer surfaces of the tube throwing section (11), the rounding section (12), the wall reduction and equalization 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).

2. The secondary rolling mandrel for rolling seamless tubes according to claim 1, characterized in that: 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.

3. The secondary rolling mandrel for rolling seamless tubes according to claim 2, characterized in that: 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).

4. A secondary rolling mandrel for rolling seamless tubes according to claim 3, characterized in that: The generatrix of the circular section (12) is a straight line or a circular arc, and the generatrix of the circular section (12) is tangent to the tube-throwing section (11).

5. A secondary rolling mandrel for rolling seamless tubes according to claim 4, characterized in that: 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.

6. A secondary rolling mandrel for rolling seamless tubes according to claim 5, characterized in that: The length ratios 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) 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.

7. A secondary rolling mandrel for rolling seamless tubes according to claim 6, characterized in that: The length ratio of the tube throwing section (11), the rounding section (12), the straight 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.

8. A secondary rolling mandrel for rolling seamless tubes according to claim 2, characterized in that: The angles between the generatrix and axis (d) of the wall-reducing uniform set section (13), the compression rotary rolling section (14), and the contact biting section (15) are 3.52°-4.75°, 8°-12°, and 25°-38°, respectively.

9. A secondary rolling mandrel for rolling seamless tubes according to claim 8, characterized in that: The angles between the generatrix and axis (d) of the wall-reducing uniform set section (13), the compression rotary rolling section (14), and the contact biting section (15) are 4°, 10°, and 25°, respectively.

10. A secondary rolling mandrel for rolling seamless tubes according to claim 1, characterized in that: A through hole (10) is formed on the left side of the top body (1), and the left side of the inner cavity (100) of the top body (1) is connected to the through hole (10).

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