Secondary rolling plug for rolling non-ferrous metal seamless tube and rolling mill

Abstract

The invention relates to a secondary rolling plug for rolling a non-ferrous metal seamless pipe and a rolling mill. A plug body is sequentially provided with a pipe throwing section, a rounding section, a wall reducing and flattening integrated transformation section, a compression rotating rolling section, a contact biting section and a contact section 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 pipe is not prone to being scratched, and the technical problems that the roll shape of a conventional three-high rolling mill cannot achieve biting rotation, clamping in the rolling process and smooth pipe throwing in the non-ferrous metal rolling process are solved.

Description

Technical Field

[0001] The invention relates to the field of nonferrous metal processing, in particular to a secondary rolling plug and a rolling mill for rolling nonferrous metal seamless pipes. Background Art

[0002] The rolling of non-ferrous metals in the seamless pipe production process has higher technical requirements, which is different from the rolling mode of traditional ferrous seamless pipe products. The auxiliary tools of the existing three-roll mill are prone to scratches and stuttering on the surface of non-ferrous metals when processing non-ferrous metals. Summary of the invention

[0003] The present invention aims to solve the above-mentioned problems and provides a secondary rolling plug and a rolling mill for rolling non-ferrous metal seamless pipes, thereby solving the above-mentioned problems.

[0004] A secondary rolling plug for rolling non-ferrous metal seamless pipes, wherein the plug body is sequentially formed with a pipe throwing section, a rounding section, a wall reducing and leveling section, a compression and rotation rolling section, a contact biting section and a contact section from right to left, and the outer side surfaces of the pipe throwing section, the rounding section, the wall reducing and leveling section, the compression and rotation rolling section, the contact biting section and the contact section are all rotating surfaces with the axis of the plug body as the axis.

[0005] Furthermore, the generatrix of the outer side surfaces of the contact biting section, the compression rotary rolling section and the wall reduction uniform transformation section is a straight line, and the angle between the generatrix of the outer side surfaces of the contact biting section, the compression rotary rolling section and the wall reduction uniform transformation section and the axis gradually decreases.

[0006] Furthermore, the generatrix of the pipe throwing section and the contact section is an arc, the generatrix of the pipe throwing section is tangent to the right end face of the plug body, and the generatrix of the contact section is tangent to the left end face of the plug body.

[0007] Furthermore, the generatrix of the return circle segment is a straight line or an arc, and the generatrix of the return circle segment is tangent to the pipe segment.

[0008] Furthermore, the plug body is also formed with a straight section, which is located between the circular section and the wall reduction and uniform transformation 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 circular section and the wall reduction and uniform transformation section respectively.

[0009] Furthermore, the length ratios of the pipe throwing section, rounding section, straight section, wall reduction and equalization section, compression and rotation rolling section, contact and biting section and 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 pipe throwing section, rounding section, straight section, wall reduction and equalization section, compression and rotation rolling section, contact and biting section and contact section along the axial direction is: 1:1.67:0.67:11.00:12.67:2.34:2.66.

[0011] Furthermore, the included angles between the generatrix of the pipe throwing section, the circle returning section and the wall reduction and equalization transformation section and the axis are 3.52°-4.75°, 8°-12° and 25°-38° respectively.

[0012] Furthermore, the included angles between the generatrix of the pipe throwing section, the circle returning section and the wall reduction and equalization transformation section and the axis are 4°, 10° and 25° respectively.

[0013] A rolling mill for secondary rolling plugs for rolling nonferrous metal seamless pipes also includes rollers, which are arranged circumferentially with the axis of the plug body as the axis.

[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 the non-ferrous metal tube, and solves the technical problem that the conventional three-roll mill roll shape cannot achieve biting rotation, rolling jam and smooth tube throwing when rolling non-ferrous metals. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0016] Figure 1 : A front cross-sectional view of the secondary rolling plug along the axis; Figure 2 :exist Figure 1 A partial enlarged view of the middle A; Figure 3 :exist Figure 1 A partial enlarged view of point B in the middle; Figure 4 :exist Figure 1 A partial enlarged view of point C in the middle; Figure 5 : A three-dimensional image of the secondary rolling plug; Figure 6 : A three-dimensional view of the secondary rolling plug and the ejector rod; Figure 7 : Cross-sectional view of the secondary rolling plug and ejector rod; Figure 8 : Schematic diagram of the side view structure of the rolling mill. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings and examples: Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention. like Figures 1 to 7 As shown, a secondary rolled plug for rolling non-ferrous metal seamless pipes, the plug body 1 is formed with a pipe throwing section 11, a rounding section 12, a wall reducing and balancing section 13, a compression and rotary rolling section 14, a contact and biting section 15 and a contact section 16 from right to left in sequence, and the outer side surfaces of the pipe throwing section 11, the rounding section 12, the wall reducing and balancing section 13, the compression and rotary rolling section 14, the contact and biting section 15 and the contact section 16 are all rotating surfaces with the axis d of the plug body 1 as the axis.

[0020] Furthermore, the generatrix of the contact biting section 15, the compression rotary rolling section 14 and the outer side surface of the wall reduction uniformity transformer 13 is a straight line, and the angle between the generatrix of the contact biting section 15, the compression rotary rolling section 14 and the outer side surface of the wall reduction uniformity transformer 13 and the axis d gradually decreases.

[0021] Preferably, a second fillet 19 and a first fillet 18 are formed between the two ends of the compression rotary rolling section 14 and the contact biting section 15 and the wall reduction and leveling transformation section 13 respectively.

[0022] Furthermore, the generatrix of the pipe throwing section 11 and the contact section 16 is an arc, the generatrix of the pipe throwing section 11 is tangent to the right end face of the plug body 1 , and the generatrix of the contact section 16 is tangent to the left end face of the plug body 1 .

[0023] Furthermore, the generatrix of the circular segment 12 is a straight line or an arc, and the generatrix of the circular segment 12 is tangent to the pipe segment 11 .

[0024] Furthermore, the plug body 1 is also formed with a straight section 17, which is located between the circular section 12 and the wall-reducing and uniformly variable section 13, and 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 circular section 12 and the generatrix of the wall-reducing and uniformly variable section 13 respectively.

[0025] Furthermore, the length ratios of the pipe throwing section 11, the rounding section 12, the straight section 17, the wall reduction and uniform transformation section 13, the compression and rotary rolling section 14, the contact and 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. It should be noted that the two fillets at both ends of the compression and rotary rolling section 14, half of the fillets are located within the length of the compression and rotary rolling section 14, and the other half are located within the length of the other section.

[0026] Furthermore, the optimal length ratio of the pipe throwing section 11, the rounding section 12, the straight section 17, the wall reduction and equalization section 13, the compression and rotation rolling section 14, the contact and biting section 15 and the contact section 16 along the axis d direction is: 1:1.67:0.67:11.00:12.67:2.34:2.66.

[0027] Furthermore, the included angles between the generatrix of the pipe-throwing section 11, the rounding section 12 and the wall-reducing and uniformly transforming section 13 and the axis d are 3.52°-4.75°, 8°-12° and 25°-38° respectively. The design of the curved surface angle realizes the extension, diameter expansion and wall reduction of the rough pipe during the rolling process and improves the quality accuracy of the inner surface of the pipe body.

[0028] Furthermore, the optimal angles between the generatrix of the pipe-throwing section 11, the circle-returning section 12 and the wall-reducing and uniformly transforming section 13 and the axis d are 4°, 10° and 25° respectively.

[0029] Furthermore, a channel for lubricating oil and / or cooling water to pass through is provided on the left side of the plug body 1. The lubricating oil plays a lubricating role, and the cooling water plays a cooling role.

[0030] Alternatively, if Figure 2 As shown, a through hole 10 is formed on the left side of the plug body 1, and the left side of the inner cavity 100 of the plug body 1 is connected with the through hole 10. Lubricating oil and / or cooling water passes through the inner cavity 100 and is sprayed from the through hole 10 into the rough pipe being rolled.

[0031] Alternatively, if Figures 5 to 7 As shown, the left end face of the plug 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 respectively connected with the nozzle 21 and the delivery pipe 6, the delivery pipe 6 is inserted into the inner cavity 100 of the plug body 1, and the lubricating oil and / or cooling water are sequentially sprayed from the nozzle 21 to the rough pipe being rolled after passing through the delivery pipe and the mounting block 2.

[0032] When the plug body 1 outputs lubricating oil, the application field of the self-lubricating system is the secondary perforation process technology during hot rolling production of metal seamless pipes. The advantage is that it achieves large metal ductility and elongation coefficient. It improves the density of the metal material structure, solves the inner surface defects and spiral marks during mandrel rolling, and the self-lubricating system solves the quality problems caused by the inner surface and secondary oxidation during the large elongation process. The self-lubricating system sprays lubricating liquid during the rolling process to isolate the harmful gases in the air from the influence of the matrix structure components of non-ferrous metal titanium, clean the oxide layer and form an anti-oxidation film.

[0033] Furthermore, the non-ferrous metals are titanium alloys TC4, Ti80, and Ti75.

[0034] Furthermore, the fillet radius of the right side of the compression rotary rolling section 14 is 30 mm to 50 mm, the fillet radius of the left side of the compression rotary rolling section 14 is 40 mm to 60 mm, and the fillet radius of the contact section 16 is 50 mm to 80 mm.

[0035] Among them, the function of the pipe throwing section 11 is to realize the smooth separation of the rough pipe from the head body 1 after the rolling is completed; the function of the rounding section 12 is to realize the roundness of the outer diameter of the rough pipe during the rolling process to meet the quality requirements of the outer diameter; the function of the straight section 17 is to complete the smooth rounding of the pipe and the quality control of the wall thickness during the rolling process; the function of the wall reduction and leveling section 13 is to realize the stroke wall thickness, expand the outer diameter, and level the inner surface during the rolling process from solid billet to pipe material; the function of the compression and rotation rolling section 14 is to realize the center loosening of the billet and then rotate and roll forward; the contact and bite section 15 enables the billet to overcome the resistance of the head and realize smooth bite before rolling in the next step; the contact section 16 plays the role of contacting the billet with the top of the head body 1 and guiding the billet.

[0036] like Figures 1 to 8 As shown, a rolling mill for secondary rolling plugs for rolling non-ferrous metal seamless pipes further comprises rollers 3, wherein the rollers 3 are arranged circumferentially with the axis d of the plug body 1 as the axis.

[0037] Furthermore, the angle between the axis d of the plug body 1 and the rotation axis of the roller 3 is in the range of 6° to 9°.

[0038] Furthermore, during the production rolling process, the plug body 1 is subjected to floating rolling, that is, the plug body 1 can only rotate with the axis d as the rotation axis.

[0039] Furthermore, the mandrel body 1 is fixedly connected to the mandrel 4 , and the mandrel 4 is connected to the mandrel trolley via the mandrel tail handle 5 .

[0040] Preferably, it further comprises a connecting tube 9, both ends of which are threadedly connected to the mandrel body 1 and the mandrel 4 respectively.

[0041] Preferably, it further comprises a support frame 7 , which is located inside the top rod 4 , the outer side of the support frame 7 contacts the inner wall of the top rod 4 , and the delivery pipe 6 passes through the inner hole of the support frame 7 .

[0042] Preferably, a positioning block 8 is further included, the positioning block 8 is inserted into the mandrel tail handle 5 , and the delivery tube 6 passes through the mandrel tail handle 5 .

[0043] Furthermore, the number of the rollers 3 is three, and the three rollers 3 are evenly arranged around the circumference.

[0044] Preferably, the rolling mill can be a rolling mill disclosed in the Chinese patent with publication number CN114425564B. Among them, the pipe throwing section 11 and the rounding section 12 correspond to the contact biting section of the Chinese patent roller, the straight section 17 corresponds to the rotating rolling section of the Chinese patent roller, the wall reduction and equalization integrated deformation section 13 corresponds to the rotating rolling section of the Chinese patent roller, the compression and rotation rolling section 14 corresponds to the integrated deformation section of the Chinese patent roller, the contact biting section 15 corresponds to the equalization section of the Chinese patent roller, and the contact section 16 corresponds to the rounding section and pipe throwing section of the Chinese patent roller. Through the integrated deformation section, equalization section and rounding section of the three rollers 3, the three-roller rolling mill forms effective metal compression and flow through the micro-integration and the curved surface of the plug body 1 during the rolling process, realizing the smooth rolling of non-ferrous metals; the plug body 1 conforms to the plastic characteristics of non-ferrous metals, and the deformation distribution of the designed secondary rolling plug curved surface effectively solves the technical problem of the tail triangle at the tail end of the pipe body. During operation, the rough pipe first contacts and bites the roller 3 of the three-roll mill during the rolling process, and then the non-ferrous metal rough pipe is contacted and bitten and driven to rotate toward the direction of the pipe throwing section. The outer surface of the non-ferrous metal rough pipe rotates through the rolling section, the transformation section, the leveling section and the rounding section in turn, and then is thrown out of the three-roll mill from the pipe throwing section.

[0045] It should be noted that the rolling mill of the present application may be other two-roll rolling mills and three-roll rolling mills in the prior art.

[0046] During processing, the direction of the rough pipe is moving from left to right, the axial position of the mandrel body 1 is fixed, and the roller 3 rotates to roll the rough pipe.

[0047] The present invention is described above by way of examples, but the present invention is not limited to the above specific embodiments, and any changes or modifications made based on the present invention belong to the scope of protection claimed by the present invention.

Claims

1. A secondary rolling plug for rolling non-ferrous metal seamless pipes, characterized in that: The plug body (1) is formed with a pipe throwing section (11), a rounding section (12), a wall reducing and balancing section (13), a compression and rotary rolling section (14), a contact and biting section (15) and a contact section (16) in sequence from right to left, and the outer side surfaces of the pipe throwing section (11), the rounding section (12), the wall reducing and balancing section (13), the compression and rotary rolling section (14), the contact and biting section (15) and the contact section (16) are all rotation surfaces with the axis (d) of the plug body (1) as the axis.

2. The secondary rolling plug for rolling nonferrous metal seamless pipe according to claim 1, characterized in that: The generatrix of the outer side surfaces of the contact biting section (15), the compression rotary rolling section (14) and the wall reduction and uniform transformation section (13) is a straight line, and the angle between the generatrix of the outer side surfaces of the contact biting section (15), the compression rotary rolling section (14) and the wall reduction and uniform transformation section (13) and the axis (d) gradually decreases.

3. The secondary rolling plug for rolling nonferrous metal seamless pipe according to claim 2, characterized in that: The generatrix of the pipe throwing section (11) and the contact section (16) is an arc, the generatrix of the pipe throwing section (11) is tangent to the right end face of the plug body (1), and the generatrix of the contact section (16) is tangent to the left end face of the plug body (1).

4. The secondary rolling plug for rolling nonferrous metal seamless pipe according to claim 3, characterized in that: The generatrix of the return circle segment (12) is a straight line or an arc, and the generatrix of the return circle segment (12) is tangent to the pipe segment (11).

5. The secondary rolling plug for rolling nonferrous metal seamless pipe according to claim 4, characterized in that: The plug body (1) is further formed with a straight section (17), the straight section (17) being located between the circular section (12) and the wall reduction and uniform integration section (13), the generatrix of the straight section (17) being parallel to the axis (d), and the two ends of the generatrix of the straight section (17) respectively intersecting with the generatrix of the circular section (12) and the generatrix of the wall reduction and uniform integration section (13).

6. The secondary rolling plug for rolling nonferrous metal seamless pipe according to claim 5, characterized in that: The length ratios of the pipe throwing section (11), the rounding section (12), the straight section (17), the wall reduction and equalization section (13), the compression and rotation rolling section (14), the contact and 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. The secondary rolling plug for rolling nonferrous metal seamless pipe according to claim 6, characterized in that: The length ratio of the pipe throwing section (11), the rounding section (12), the straight section (17), the wall reduction and equalization section (13), the compression and rotation rolling section (14), the contact and 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. The secondary rolling plug for rolling nonferrous metal seamless pipe according to claim 2, characterized in that: The included angles between the generatrix of the wall reduction and uniform transformation section (13), the compression and rotation rolling section (14) and the contact and bite section (15) and the axis (d) are 3.52°-4.75°, 8°-12° and 25°-38° respectively.

9. The secondary rolling plug for rolling nonferrous metal seamless pipe according to claim 8, characterized in that: The included angles between the generatrix of the wall reduction and uniform deformation section (13), the compression and rotation rolling section (14) and the contact and bite section (15) and the axis (d) are 4°, 10° and 25° respectively.

10. A rolling mill using the secondary rolling plug for rolling a non-ferrous metal seamless pipe according to any one of claims 1 to 9, characterized in that: It also comprises rollers (3), wherein the rollers (3) are arranged in a circle with the axis (d) of the mandrel body (1) as the axis.

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