CN101844153A

CN101844153A - Metal bar material and pipe material precision hot helical rolling and blanking roller and blanking method thereof

Info

Publication number: CN101844153A
Application number: CN 201010184508
Authority: CN
Inventors: 刘晋平; 胡正寰; 曲国波; 王宝雨; 杨翠苹; 贾瀚龙
Original assignee: University of Science and Technology Beijing USTB
Current assignee: University of Science and Technology Beijing USTB
Priority date: 2010-05-20
Filing date: 2010-05-20
Publication date: 2010-09-29
Anticipated expiration: 2030-05-20
Also published as: CN101844153B

Abstract

The invention belongs to the technical field of metal plastic forming, and particularly provides a roll and a blanking method for precision hot cross rolling blanking of metal bars and pipes, and is suitable for low-carbon steel, medium-carbon steel, low-alloy steel and bearing steel metal Material. In the present invention, the helical ribs of the formed V-shaped ring grooves are processed on the spiral-grooved rolls, and the V-shaped ring grooves are formed on the metal rod tube material, and a certain force is applied to the prefabricated V-shaped ring grooves by using the characteristics of the blue brittle zone of the steel Shearing promotes cracks to expand along the radial circumference from the surface of the metal rod tube material, thereby completing cutting to length and obtaining good section quality. The invention has the advantages that the cross-rolled V-shaped ring groove belongs to plastic forming without metal waste, and has significant technical and economic advantages such as energy saving, material saving, high efficiency, high quality and low cost.

Description

The roll and the baiting method thereof of a kind of metal bar material, the blanking of pipe material precision hot helical rolling

Technical field

The invention belongs to the metal forming technical field, the roll and the baiting method thereof of a kind of metal bar material and the blanking of pipe material precision hot helical rolling is provided especially, be applicable to mild steel, medium carbon steel, low-alloy steel and bearing steel metal material.

Technical background

The cutting stock problems of metal bar material and pipe material extensively are present in the procedure for preparation of various parts.It is low that baiting methods such as shearing at present, sawing, high energy cutting exist stock utilization to some extent, and blanking pressure is big, energy consumption height, problems such as the low and blanking cross section quality difference of productivity ratio.

Summary of the invention

The objective of the invention is to solve baiting methods such as present shearing, sawing, high energy cutting, to exist stock utilization to some extent low, and blanking pressure is big, energy consumption height, problem such as low and blanking cross section quality difference of productivity ratio.

The roll of a kind of metal bar material and the blanking of pipe material precision hot helical rolling: it is characterized in that roll is the helical groove roll, on the helical groove roll, be processed with the spiral ridge of shaping V-type annular groove, roller diameter is 5～7 with rolling bars and tubes material diameter ratio, the helical groove roll of rolling V-type annular groove is partly formed shown in Figure 1 by the part of nipping, spiral ridge, the part of nipping of helical groove roll is a frustum of a cone, and nipping of blank realized by the frustum of a cone; Spiral ridge partly is divided into be shaped district, Runout area; The girth of spiral ridge is 360 °, and the basic screw-pitch of spiral ridge equates with the pitch of V-type annular groove, lead angle β=1 °～6 °, and the spiral ridge bottom surface is constant all the time apart from the distance of roll axial line to be that the spiral ridge bottom surface is on same cylinder; In the district that is shaped, the rib height of spiral ridge starting point begins to be elevated to gradually from the spiral ridge bottom surface and is rolled the deep equality of V-type annular groove, being rolled the V-type annular groove degree of depth is 3.03mm～5.05mm, the spiral ridge rib is wide to be 0.5mm～3.03mm, the side of spiral ridge and the parallel sided of being rolled the V-type annular groove, be shaped district's terminal point fin end face, side and bottom surface be one complete reverse V-shaped, corresponding fully with the V-type groove thermal state sizes that is rolled, the girth that fin is distinguished in shaping is 120 °～240 °; Runout area, spiral ridge is corresponding fully with the V-type groove thermal state sizes that is rolled, and the V-type annular groove that is shaped is substantially carried out shaping, to improve rolled piece presentation quality and dimensional accuracy, also have the effect of guiding simultaneously, the girth of Runout area fin is 360 ° of girths that deduct the district's fin that is shaped.

Roll of the present invention is installed on the skew rolling mill, be heated to 900 ℃～1150 ℃ metal bars and tubes material 1, be pushed in the skew rolling mill as shown in Figure 2, two oblique roller rollings 1 with identical pass, roll 23, its axis intersects 2 α angles in two roller vertical plane projections, intersect the α angle with rolling centerline, α=1 °～6 °, two rolls turn to identical, bars and tubes material 1 reverse rotation under the effect of roll, and along the center line axially-movable of the two roller projection angles of cut, roll whenever rotates a circle and finishes the rolling of a V-type annular groove, utilizes the characteristic in the crisp district of SteelBlue, temperature drop is applied certain power to the bars and tubes material of the prefabricated V-type annular groove in blue shortness district to be sheared, impel the surface radially circumference expansion of crackle, can obtain comparatively neat and well spaced cutting plane, thereby finish blanking by bars and tubes material.

A kind of metal bar material of the present invention and pipe material precision hot helical rolling baiting method are applicable to blanking diameter 10mm～80mm; Length is greater than 10mm, but is no more than 2 times of blanking diameters; Wall thickness is not less than the bars and tubes material blanking of mild steel, medium carbon steel, low-alloy steel and the bearing steel metal material of 5mm.

The invention provides a kind of new metal bar material and pipe material baiting method, method with the continuous Plastic Forming of a kind of high efficiency, low energy consumption, high accuracy, high material-saving rate, on the metal bars and tubes material, form the V-type annular groove, utilize the characteristic in the crisp district of SteelBlue that prefabricated V-type annular groove is applied certain power shearing, impel the surface radially circumference expansion of crackle by the metal bars and tubes material, thereby finish the scale blanking, obtain good cross section quality.

The invention has the advantages that:

Oblique milling V-type annular groove belongs to Plastic Forming does not have the metal waste, roll whenever rotates a circle and finishes the rolling of a V-type annular groove, rolling 50～100 the V-type annular grooves of per minute, the characteristic of utilizing the crisp district of SteelBlue applies certain power to prefabricated V-type groove and shears and impel the surface radially circumference expansion of crackle by bars and tubes material, thereby finish blanking, obtain good cross section quality, have significantly technological and economical advantages such as energy-conservation, material-saving, efficient, high-quality, low cost.

Description of drawings

Fig. 1 is the roll schematic diagram.

Fig. 2 operation of rolling schematic diagram of the present invention, rod pipe raw material 1, roll 1, roll 23.

Fig. 3 roll of the present invention locus schematic diagram, two roll axis are at space crossed 2 α angles.Two oblique roller rollings with same-handed pass, its axis become 2 α angles in the space, intersect the α angle with rolling centerline, α=1 °～6 °.

Fig. 4 is a steel pipe V-type annular groove schematic diagram.

Fig. 5 is a round metal bar V-type annular groove schematic diagram.

The specific embodiment

Embodiment 1

Diameter is 31mm as shown in Figure 4, thickness is 6mm, length is a blanking example that shuts out the V-type annular groove on the bearing steel pipe of 3000mm in advance, with diameter 200mm, lead angle β=1.47 °, basic screw-pitch is 16.16mm, the spiral ridge forming length is 180 °, spiral ridge Runout area length is 180 °, the fin Breadth Maximum is 2.525mm, maximum height is 3.03mm, a pair roller be installed on the skew rolling mill, with the diameter that is heated to 1100 ℃ is 31mm, thickness is 6mm, length is the bearing steel pipe 1 of 3000mm, push in the skew rolling mill as shown in Figure 2, two oblique roller rollings 1 with identical pass, roll 23, its axis intersects 2.94 ° of angles in two roller vertical plane projections, intersect 1.47 ° of angles with rolling centerline, α=1.47 °, it is identical that two rolls turn to, bearing steel pipe 1 reverse rotation under the effect of roll, and along the center line axially-movable of the two roller projection angles of cut, roll whenever rotates a circle and finishes the rolling of a V-type annular groove, utilize the characteristic in bearing steel blue shortness district, temperature drop is applied certain power to the bearing steel pipe of the prefabricated V-type annular groove in bearing steel blue shortness district shear, impel the surface radially circumference expansion of crackle by the pipe material, can obtain comparatively neat and well spaced cutting plane, thereby finish the bushed bearing blanking that cut lengths is 16mm.

Embodiment 2

Diameter is 41mm as shown in Figure 5, length is a blanking example that shuts out the V-type annular groove on the round bar of No. 45 steel of 2000mm in advance, with diameter is 240mm, lead angle is β=2.3 °, basic screw-pitch is 30.3mm, the spiral ridge forming length is 210 °, spiral ridge Runout area length is 150 °, the fin Breadth Maximum is 3.03mm, maximum height is that a pair roller of 4.04mm is installed on the skew rolling mill, with the diameter that is heated to 1100 ℃ is 41mm, length is No. 45 steel round bars 1 of 2000mm, push in the skew rolling mill as shown in Figure 2, two oblique roller rollings 1 with identical pass, roll 23, its axis intersects 4.6 ° of angles in two roller vertical plane projections, intersect 2.3 ° of angles with rolling centerline, α=2.3 °, two rolls turn to identical, round bar 1 reverse rotation under the effect of roll, and along the center line axially-movable of the two roller projection angles of cut, roll whenever rotates a circle and finishes the rolling of a V-type annular groove, utilize the characteristic in No. 45 crisp districts of SteelBlue, the round bar of the prefabricated V-type annular groove in the crisp district of temperature drop to 45 SteelBlue is applied certain power to be sheared, impel the surface radially circumference expansion of crackle, can obtain comparatively neat and well spaced cutting plane, thereby finish the round bar blanking that cut lengths is 30mm by round bar.

Claims

1, a kind of roll of metal bar stock and tube material precision hot cross-rolling blanking, it is characterized in that, roll is a spiral pass roll, is processed with the spiral rib of forming V-shaped ring groove on the spiral pass roll, roll diameter and The diameter ratio of the rod to be rolled is 5 to 7. The spiral groove roll for rolling the V-shaped ring groove is composed of a biting part and a spiral convex part. The biting is realized by the truncated cone; the part of the spiral rib is divided into a forming area and a finishing area; the circumference of the spiral rib is 360°, and the basic pitch of the spiral rib is equal to the pitch of the V-shaped ring groove. Angle β=1°～6°, the distance between the bottom surface of the helical rib and the axis line of the roll is always constant, that is, the bottom surface of the helical rib is on the same cylindrical surface; The bottom surface of the rib starts to rise gradually until it is equal to the depth of the rolled V-shaped ring groove. The sides of the rolled V-shaped ring groove are parallel, and the top, side and bottom surfaces of the convex rib at the end of the forming area are a complete inverted V shape, which completely corresponds to the hot state size of the rolled V-shaped groove. The perimeter of the convex rib in the forming area is 120 °～240°; Finishing area: the helical ribs completely correspond to the thermal size of the rolled V-shaped groove, and the basically formed V-shaped ring groove is shaped to improve the appearance quality and dimensional accuracy of the rolled piece. For the role of guidance, the perimeter of the ribs in the finishing area is 360° minus the perimeter of the ribs in the forming area.

2. The blanking method of the roll that adopts the metal bar stock and the pipe stock precision hot cross-rolling blanking according to claim 1, is characterized in that, the roll described in claim 1 is installed on the cross-rolling mill, and heated to 900 ° C Metal rods and tubes at ~1150°C are pushed into the skew rolling mill. Two skew rolling rolls with the same pass shape, their axes intersect at an angle of 2α in the vertical plane projection of the two rolls, and cross the rolling center line at an angle of α, α=1° ~6°, the direction of the two rolls is the same, the rod and pipe material rotates in the opposite direction under the action of the rolls, and moves axially along the center line of the projected intersection angle of the two rolls, and the rolling of a V-shaped ring groove is completed every time the roll rotates. Due to the characteristics of the blue brittle zone, a certain force is applied to the prefabricated V-shaped ring groove rod and tube material in the blue brittle zone to shear the crack, so that the crack expands from the surface of the rod and tube material along the radial circumference, and a relatively uniform profile can be obtained. Cut the surface to complete the blanking.

3. According to claim 2, the blanking method of the rolls of metal bar stock and tube stock precision hot cross rolling blanking is characterized in that, this blanking method is applicable to blanking diameters of 10 mm to 80 mm; the length is greater than 10 mm, but not More than 2 times the blanking diameter; low-carbon steel, medium-carbon steel, low-alloy steel and bearing steel metal materials with a wall thickness of not less than 5mm.