Die mounting device capable of adjusting wall thickness of seamless tube

Abstract

According to the technical scheme, the die mounting device capable of adjusting the wall thickness of the seamless pipe is characterized in that a first spherical groove is formed in the center of a fixed base, a movable base matched with the first spherical groove is arranged in the first spherical groove, an annular groove is formed in the center of the movable base, a stretching die is arranged in the annular groove, and a moving core matched with the stretching die is arranged in the stretching die; a gap is reserved between the drawing die and the movable core, a pipe inlet is formed in one end of the drawing die, and pressing plates are arranged on the two sides of one end of the pipe inlet respectively and are in threaded connection with the movable base. A positioning block is arranged above the edge of the first spherical groove, a threaded hole is formed in one end of the positioning block, an adjusting bolt penetrates through the threaded hole and then is inserted into the threaded groove, and an arc protrusion matched with the second spherical groove is arranged at the other end of the positioning block. The utility model has the beneficial effects that the contact surface of the movable base and the fixed base is designed to be a spherical surface, so that the range of the adjustable angle of the movable base is expanded; the stability of the device is improved under the premise that the angle adjustment is not affected through the arc protrusions.

Description

Technical Field

[0001] The utility model relates to the field of seamless pipe processing, in particular to a mold installation device capable of adjusting the wall thickness of the seamless pipe. Background Art

[0002] Seamless pipes have the characteristics of high compressive strength, low friction coefficient, good corrosion resistance, etc., so they are widely used in the fields of petroleum, chemical industry, metallurgy, electric power and nuclear energy industry. In the production process of seamless pipes, uneven wall thickness is inevitable, and poor wall thickness uniformity will lead to cracking, wrinkling and other problems in the seamless pipes during subsequent processing, affecting subsequent use. Therefore, it is necessary to adjust the seamless pipes that have produced wall thickness deviations to improve the wall thickness uniformity and make them meet the production standards.

[0003] At present, the uniformity of the wall thickness of seamless pipes is usually adjusted by adjusting the angle of the die. Figure 1-2 : The four corners of the movable base 2 are directly fixed on the fixed base 1 with adjusting bolts 52, and the stretching die 3 is arranged in the annular groove 22. The gap between the movable base 2 and the fixed base 1 is generated by adjusting the adjusting bolts 52, and the height of the four adjusting bolts 52 determines the angle of the stretching die 3. However, this structure has a small adjustable range and low stability during use, especially when the pulling force is large, the bolts will be deformed, which reduces the life of the die installation device and affects the work efficiency. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide a mold installation device capable of adjusting the wall thickness of seamless pipes, so that the mold installation device can be used to adjust the uniformity of seamless pipes with existing wall thickness deviations, and solve the problems of small adjustment range and low stability of the mold installation device.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a mold installation device capable of adjusting the wall thickness of a seamless pipe, comprising a stretching mold, a No. 1 spherical groove is provided at the center of a fixed base, thread grooves are evenly provided around the No. 1 spherical groove, a movable base matching the No. 1 spherical groove is provided in the No. 1 spherical groove, a plurality of No. 2 spherical grooves are provided on the movable base, an annular groove is provided at the center of the movable base, a stretching mold is provided in the annular groove, the stretching mold comprises a stretching outer ring and a stretching inner ring, the stretching outer ring and the stretching inner ring are fixedly connected, a core matching the No. 1 spherical groove is provided in the inner hole of the stretching inner ring, a gap is left between the stretching inner ring and the core, a pipe inlet is provided at one end of the stretching mold away from the annular groove, pressing plates are provided on both sides of one end of the pipe inlet, and the pressing plates are threadedly connected to the movable base;

[0006] A positioning block is provided above the edge of the No. 1 spherical groove, one end of which is provided with a threaded hole, and the adjusting bolt passes through the threaded hole and is inserted into the threaded groove, and the other end of the positioning block is provided with an arc protrusion matching the No. 2 spherical groove.

[0007] Furthermore, the inner hole of the stretch inner ring is provided with a diameter-changing section, a diameter-fixing section and an outlet section in sequence from an end close to the pipe inlet to an end away from the pipe inlet.

[0008] Furthermore, the angle formed by the sizing section and the reducing section is 15° to 20°, and the angle formed by the sizing section and the outlet section is 30° to 35°.

[0009] Furthermore, an extension line of the center line of the positioning block passes through the center of the movable base.

[0010] Furthermore, the plurality of thread grooves are distributed at equal angles with the center of the movable base as the center.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] (1) By adjusting the angle of the bolt-fixed movable base, the tension generated by the tension equipment drives the mother blank to move, and the floating core and the stretching inner ring jointly extrude the mother blank to complete the uniformity adjustment of the wall thickness of the seamless pipe.

[0013] (2) The contact surface between the movable base and the fixed base is designed to be a spherical surface. The fit between the two not only expands the adjustable angle range of the movable base, but also improves the stability of the movable base after the angle is adjusted.

[0014] (3) The arc protrusion on the positioning block cooperates with the No. 2 spherical groove on the movable base, which makes the installation of the movable base and the fixed base more secure and the connection smoother without affecting the adjustment angle of the movable base, thereby improving the stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the front structure of the existing mold installation device;

[0016] Figure 2 A side cross-sectional view of an existing mold installation device;

[0017] Figure 3 It is a front structural schematic diagram of the utility model;

[0018] Figure 4 It is a cross-sectional view of the utility model at AA;

[0019] Figure 5 It is a side sectional view of the stretching die of the utility model;

[0020] Figure 6This is a schematic diagram of the front structure of the utility model after adjusting the angle;

[0021] Figure 7 This is a cross-sectional view at BB when the wall thickness of the seamless pipe is adjusted in the utility model.

[0022] In the figure: 1. Fixed base; 11. Spherical groove No. 1; 12. Threaded groove; 2. Movable base; 21. Spherical groove No. 2; 22. Annular groove; 3. Stretching die; 31. Stretching outer ring; 32. Stretching inner ring; 321. Variable diameter section; 322. Fixed diameter section; 323. Outlet section; 4. Pipe inlet; 41. Pressing plate; 5. Positioning block; 51. Threaded hole; 52. Adjusting bolt; 53. Arc protrusion; 6. Swinging core; 7. Mother blank. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example 1

[0024] like Figure 3-7 A mold installation device capable of adjusting the wall thickness of a seamless pipe comprises a stretching mold 3, a fixed base 1 is provided with a No. 1 spherical groove 11 at the center, a thread groove 12 is evenly arranged around the No. 1 spherical groove 11, a movable base 2 matching the No. 1 spherical groove 11 is arranged in the No. 1 spherical groove 11, so that the contact surface between the movable base 2 and the fixed base is spherical, thereby expanding the adjustable angle range of the movable base 2, a plurality of No. 2 spherical grooves 21 are arranged on the movable base 2, a ring groove 22 is arranged in the center of the movable base 2, a stretching mold 3 is arranged in the ring groove 22, and the stretching mold 3 comprises a stretching outer ring 31 The inner ring 32 is a stretching ring, and the outer ring 31 is fixedly connected to the inner ring 32. A matching core 6 is provided in the inner hole of the inner ring 32. The inner ring 32 cooperates with the core 6 to adjust the wall thickness of the seamless pipe. A gap is left between the inner ring 32 and the core 6 to facilitate the passage of the seamless pipe. The stretching die 3 is provided with a pipe inlet 4 away from the annular groove 22. Both sides of one end of the pipe inlet 4 are provided with pressing plates 41, so that the fixing of the stretching die 3 and the movable base 2 is achieved without affecting the pipe inlet. The pressing plate 41 is threadedly connected to the movable base 2, and the installation is firm and convenient for disassembly.

[0025] A positioning block 5 is provided above the edge of the No. 1 spherical groove 11, and the length direction of the positioning block 5 is perpendicular to the edge of the No. 1 spherical groove 11. A threaded hole 51 is provided at one end of the positioning block 5. An adjusting bolt 52 passes through the threaded hole 51 and is inserted into the threaded groove 12. An arc protrusion 53 matching the No. 2 spherical groove 21 is provided at the other end of the positioning block 5, so that the connection between the movable base 2 and the fixed base 1 is realized without affecting the adjustment angle of the movable base 2.

[0026] Furthermore, the inner hole of the stretch inner ring 32 is provided with a reducing section 321, a sizing section 322 and an outlet section 323 in sequence from the end close to the pipe inlet 4 to the end away from the pipe inlet 4, so as to facilitate the pipe inlet and outlet of the mother blank 7. The loose core 6 is placed in the mother blank 7, and the loose core 6 cooperates with the stretch inner ring 32 to achieve the stretching of the mother blank 7 and the uniformity of the wall thickness adjustment;

[0027] Furthermore, in this example, the angle formed by the sizing section 322 and the reducing section 321 is 18°, and the angle formed by the sizing section 322 and the outlet section 323 is 32°, which neither affects the tube feeding of the mother blank 7 nor prevents the seamless tube from breaking due to excessive diameter reduction. Example 2

[0028] The difference between this embodiment and the first embodiment is that the angle formed by the sizing section 322 and the reducing section 321 is 15°, and the angle formed by the sizing section 322 and the outlet section 323 is 30°. When the adjusted seamless pipe diameter and thickness are determined, the slower the reducing angle, the lower the probability of the seamless pipe breaking.

[0029] Furthermore, the extension line of the center line of the positioning block 5 passes through the center of the movable base 2, that is, the length direction of the positioning block 5 is perpendicular to the edge of the movable base 2, and the distance from the threaded hole 51 to the edge of the movable base 2 is the shortest, so that the movable base 2 is not easy to shake along the tangential direction, thereby improving the stability of the movable base 2 after the angle is adjusted;

[0030] Furthermore, the plurality of thread grooves 12 are distributed at equal angles with the center of the movable base 2 as the center, so that the movable base 2 is subjected to a more uniform force and has a larger adjustable range.

[0031] When using:

[0032] First, install the fixed base 1 on the tensioning equipment, then place the stretching die 3 in the annular groove 22, and use the pipe inlet 4 to fix the stretching die 3 on the movable base 2; the arc protrusion 53 fits with the No. 2 spherical groove 21, and the adjusting bolt 52 passes through the threaded hole 51 and is inserted into the threaded groove 12 to install the movable base 2 on the fixed base 1.

[0033] After completing the above preliminary installation, the mother blank 7 is sleeved on the loose core 6. The left end of the mother blank 7 is provided with a horizontal straightening roller, and the right end of the mother blank 7 is provided with a tension device. The tension generated by the horizontal straightening roller and the tension device is perpendicular to the fixed base 1. According to the wall thickness deviation of the mother blank 7, the angle of the movable base 2 is fixed by the adjusting bolt 52. The tension generated by the tension device drives the mother blank 7 to move. The loose core 6 and the stretching inner ring 32 jointly extrude the mother blank 7 to complete the uniformity adjustment of the wall thickness of the mother blank 7. The mating surface of the movable base 2 and the fixed base 1 is a spherical surface, which greatly improves the stability of the mold installation device after adjusting the angle, and expands the adjustable angle range of the movable base; the arc protrusion on the positioning block cooperates with the No. 2 spherical groove on the movable base, which makes the installation of the movable base and the fixed base more firm and the connection smoother without affecting the adjustment angle of the movable base, thereby improving the stability of the device.

[0034] The undisclosed parts in the present utility model are all prior art, and their specific structures, materials and working principles are not described in detail. Although the embodiments of the present utility model have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the attached claims and their equivalents.

Claims

1. A mold installation device capable of adjusting the wall thickness of a seamless pipe, comprising a movable core (6), characterized in that: A No. 1 spherical groove (11) is provided at the center of the fixed base (1), and a plurality of thread grooves (12) are evenly provided around the No. 1 spherical groove (11). A movable base (2) matching the No. 1 spherical groove (11) is provided in the No. 1 spherical groove (11), and a plurality of No. 2 spherical grooves (21) are provided on the movable base (2). An annular groove (22) is provided at the center of the movable base (2), and a stretching die (3) is provided in the annular groove (22). The stretching die (3) comprises a stretching outer ring (31) and a stretching inner ring (32). The stretching outer ring (31) and the stretching inner ring (32) are fixedly connected. A matching core (6) is provided in the inner hole of the stretching inner ring (32), and a gap is left between the stretching inner ring (32) and the core (6). An inlet (4) is provided at one end of the stretching die (3) away from the annular groove (22), and pressure plates (41) are provided on both sides of one end of the inlet (4), respectively, and the pressure plates (41) are threadedly connected to the movable base (2). A positioning block (5) is provided above the edge of the first spherical groove (11), one end of the positioning block (5) is provided with a threaded hole (51), an adjusting bolt (52) passes through the threaded hole (51) and is inserted into the threaded groove (12), and the other end of the positioning block (5) is provided with an arc protrusion (53) matching the second spherical groove (21).

2. A mold installation device capable of adjusting the wall thickness of a seamless pipe according to claim 1, characterized in that: The inner hole of the stretch inner ring (32) is provided with a diameter-changing section (321), a diameter-fixing section (322) and an outlet section (323) in sequence from an end close to the pipe inlet (4) to an end away from the pipe inlet (4).

3. A mold installation device capable of adjusting the wall thickness of a seamless pipe according to claim 2, characterized in that: The angle formed by the sizing section (322) and the reducing section (321) is 15° to 20°, and the angle formed by the sizing section (322) and the outlet section (323) is 30° to 35°.

4. A mold installation device capable of adjusting the wall thickness of a seamless pipe according to claim 1, characterized in that: The extension line of the center line of the positioning block (5) passes through the center of the movable base (2).

5. The mold installation device capable of adjusting the wall thickness of a seamless pipe according to claim 1, characterized in that: The multiple thread grooves (12) are distributed at equal angles with the center of the movable base (2) as the center.

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