CN110434564B - Manufacturing process of high-strength square U-shaped bolt - Google Patents
Manufacturing process of high-strength square U-shaped bolt Download PDFInfo
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- CN110434564B CN110434564B CN201910805021.3A CN201910805021A CN110434564B CN 110434564 B CN110434564 B CN 110434564B CN 201910805021 A CN201910805021 A CN 201910805021A CN 110434564 B CN110434564 B CN 110434564B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
- B21D7/024—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a swinging forming member
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
- B21D7/162—Heating equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to a manufacturing process of a high-strength square U-shaped bolt, belonging to the technical field of machining; comprises the processes of thread turning, heating, bending and forming and non-oxidation heat treatment; heating, bending and forming: to both sides of the corner center of the part
Range heating, wherein R is the radius of the bent inner angle, d is the diameter of the bolt, and A is the elongation of the part material; controlling the heating temperature of the part to be in the range of (Ac3+30 ℃) to (Ac3+100 ℃), wherein Ac3 is the austenite transformation temperature of the part material; controlling the bending forming time within a K multiplied by d second range under the condition of ensuring that the bend angle is not deformed, wherein K is 1-1.3; the cooling speed is controlled to be 80-120 ℃/h. Compared with the prior art, the invention optimizes the manufacturing process flow of the high-strength square U-shaped bolt, improves the processing efficiency of the high-strength square U-shaped bolt, reduces the labor intensity of operators, does not need to use special hard alloy manual thread dies, and saves the cost.
Description
Technical Field
The invention belongs to the technical field of machining, and relates to a manufacturing process of a high-strength square U-shaped bolt.
Background
The high-strength square U-shaped bolt is a locking device (shown in figure 1) for connecting a main beam and a secondary beam with a chassis of a certain product of our company, has the function of preventing a vehicle from deforming and breaking under the conditions of turning, loading and the like, needs a high-strength square U-shaped bolt, and needs to be designed into an R10 bending excessive arc due to the particularity of the structure and the shape of a locked part, but increases the manufacturing difficulty of the high-strength square U-shaped bolt and the risk of cracking of a bending part.
The square U-shaped bolt material selected for meeting the high strength requirement needs to be high-strength structural steel, and the required strength needs to be achieved through a heat treatment process. At present, the process flow for machining the high-strength square U-shaped bolt in the machining industry is as follows: bending forming → conventional heat treatment → tapping, because the strength of the material is improved after the heat treatment and the hardness of the material is increased, a special hard alloy manual thread die is needed when tapping is carried out after the heat treatment according to the process flow, the processing difficulty is high, and the time consumption is long.
In order to improve the processing efficiency and reduce the cost of the high-strength square U-shaped bolt, a manufacturing process method suitable for the high-strength square U-shaped bolt must be explored.
Disclosure of Invention
The invention aims to overcome the limitation of the prior art, solve the problems of low processing efficiency and high cost of a high-strength square U-shaped bolt and provide a manufacturing process method of the high-strength square U-shaped bolt.
The purpose of the invention is realized by the following technical scheme.
A manufacturing process of a high-strength square U-shaped bolt comprises the following steps:
(1) threading;
(2) heating, bending and forming;
(3) and (4) carrying out non-oxidation heat treatment.
Advantageous effects
Compared with the prior art, the manufacturing process of the high-strength square U-shaped bolt provided by the invention optimizes the manufacturing process flow of the high-strength square U-shaped bolt, improves the processing efficiency of the high-strength square U-shaped bolt, reduces the labor intensity of an operator, does not need to use a special hard alloy manual thread die, and saves the cost.
Drawings
FIG. 1 is a schematic view of a square U-shaped bolt in a working state;
FIG. 2 is a front view of a device for bending and forming a square U-shaped bolt according to an embodiment of the present invention;
FIG. 3 is a rear view of a square U-bolt bending apparatus;
reference numerals: the device comprises a part 1, a base 2, a rotating disc 3, a central column 4, a support frame 5, a limiting device 6, an adjusting bolt 7, a stick column I8, a stick column II 9 and a vertical plate 10.
Detailed Description
The following describes the manufacturing method of the present invention in detail with reference to specific embodiments.
The manufacturing process of the high-strength square U-shaped bolt is described by taking a 40Cr material of a bending inner angle R10 as an example, and the method comprises the following steps:
(1) threading, namely machining by using a common lathe according to a drawing, and effectively solving the problems of high labor intensity, low machining efficiency and high manufacturing cost of an operator in the threading process by using a special tool in the conventional method;
(2) heating, bending and forming;
the existing bending forming method can be adopted to bend the part into a square U-shaped shape meeting the specification requirement;
preferably, the method can be realized by adopting the following processes: to both sides of the corner center of the part
Range heating; wherein: r is the radius of the bending inner angle, d is the diameter of the bolt, and A is the elongation of the part material; controlling the heating temperature of the part to be in the range of (Ac3+30 ℃) to (Ac3+100 ℃), wherein Ac3 is the austenite transformation temperature of the part material; controlling the bending forming time within the range of Kxd seconds under the condition of ensuring that the bend angle is not deformed; wherein K is 1 to 1.3; the cooling speed is controlled to be 80-120 ℃/h. The manufacturing difficulty that the high-strength square U-shaped bolt is low in bending forming yield and the bent part is cracked can be solved.
Specifically, the high-strength square U-shaped bolt with the bending inner angle R10 is made of 40Cr materials, and the heating temperature of parts is controlled to be 810-880 ℃; heating the two sides of the center of the part corner within the range of 41-50 mm; controlling the bending forming time to be 18-23 s under the condition of ensuring that the bend angle is not deformed; the cooling speed is controlled to be 80-120 ℃/h.
(3) And (4) carrying out non-oxidation heat treatment.
The step can adopt salt bath quenching or other non-oxidation heat treatment methods, meets the strength of the reinforced part material required by the existing heat treatment process, ensures that the thread size precision is not influenced, and solves the problem that the thread size precision is unqualified due to oxide skin generated by the conventional quenching method of the thread in the existing conventional heat treatment process.
Furthermore, the device for bending and forming the square U-shaped bolt can ensure that the stress at the bent angle is uniform, the bent angle is not deformed, and further the steel strength at the bent angle of the square U-shaped bolt is ensured.
A device for bending and forming a square U-shaped bolt comprises a base; the rotary table comprises a base, a rotary disc, a central column, a rod column I, a rod column II and a support frame; the base is the fixed plate, the rotary disk is connected through the bearing and can realize rotary motion with the base, the center post is connected with the rotary disk maintenance, keep a position part one end through support frame recess, the part other end passes through the center post and keeps a position with the recess on rod post I, rod post I and II centers of rod post are on same water flat line and parallel with the part, apply the effort to the rotating disk during bending forming and make it make rotary motion drive the part rotation, the part is at the center post, rod post I, rod post II combined action is down crooked around center post isodiametric bend. Through the injecing of rod post I, guaranteed that the part does not warp in the bend, and then guaranteed the rigidity intensity of U type bolt bend.
Preferably, in order to enable the part to be stressed uniformly when being bent, the stick column II is provided with a groove.
Preferably, in order to prevent the parts from moving when the parts are bent under stress, the stick column II is provided with two convex plates for limiting the parts in the convex plates.
Preferably, in order to adapt to the processing of parts of different models, the device further comprises a vertical plate I and a vertical plate II, the stick column I and the stick column II are respectively connected with the vertical plate I and the vertical plate II in a fixed mode through bolts, and the center distances between the stick column I, the stick column II and the central column are adjusted through the adjustment of the front position and the rear position of the bolts. The vertical plate connected with the stick column I can be fixed and installed on the rotating disc, and can also be fixed and installed on the base. When the stick column I is installed on the rotating disk, the stick column I and the central column rotate together along with the rotating disk, and the stress contact point of the stick column I and a part is unchanged in the bending process of the part. When the rotary disc type roller column I is installed on a base, the central column rotates along with the rotary disc, the stressed contact point of the roller column I and a part is changed continuously in the bending process of the part, and inward supporting force is provided for the bending part of the part from the outer edge point by point. The position of the stick column II is constant all the time and does not change along with the rotation of the rotating disc, and in the bending process of the part, the inward supporting force of the part is provided by overcoming the torque all the time, so that the part is ensured to be bent according to a preset angle. The structure shown in fig. 2 and 3 adopts the lever principle, and a long rod extends out of the rotating disc, and the long rod is pushed along the circumferential direction to drive the rotating disc to rotate so as to realize the bending of parts. Without being limited thereto, the bending of the part may also be achieved by controlling the rotation of the rotating disc by a motor.
Preferably, to simplify the determination of the bending point, the device further comprises a limiting device, and when the end part of the part is fixedly arranged on the limiting device, the point between the stick post I and the central post is the bending point.
Preferably, the limiting device is provided with a plurality of limiting plates which are respectively used for determining different bending points, and the positions of the limiting plates can be fixed at preset positions in a movable connection mode, such as fixing through adjusting bolts or fixing through clamping grooves.
Preferably, the limiting device is provided with a scale and a limiting plate, and the limiting plate is moved to different scale positions to determine different bending points. If the limiting plate is provided with the groove, the position is moved by sliding back and forth on the two side plates of the limiting device, and the limiting plate is fixed by the adjusting bolt after sliding to a preset position by the scale arranged on the side plates.
As shown in fig. 2 and 3, the device for bending and forming the U-shaped bolt comprises; part 1, base 2, rotary disk 3, center post 4, support frame 5, stop device 6, adjusting bolt 7, rod post I8, rod post II 9, riser 10. Wherein, base 2 is the fixed plate, the rotary disk is connected through bearing and fixed plate and is realized rotary motion, rod post I, II is connected with the base through riser and adjusting bolt, and the back-and-forth movement is realized to accessible adjusting bolt, thereby adjust and the interval between the center post, center post and rotary disk fastening connection, the during operation is fixed with part bending dimension through stop device, it makes it to make rotary motion drive part rotation to apply the effort to the rotating disc, the part is at the center post, rod post I, rod post II combined action is down crooked around center post uniform diameter.
The base 2 is fixed and connected with the rotating disc 3 through a bearing to play a role in connection and support; on being fixed in the base with riser 10 through welding mode, through welding mode with adjusting bolt 7 one end respectively with rod post I8, rod post II 9 welded fastening, adjusting bolt 7's the other end and 10 threaded connection of riser realize the fine setting function, through adjusting bolt adjustment rod post I, rod post II and the clearance between the center post. When the bending machine is in bending work, the stick column I8 and the stick column II 9 do not move relative to the fixed seat. The rotating disk 3 and the base do relative rotary motion to provide power for bending; center post 4 passes through threaded connection to be fixed on rotary disk 3, and rotary disk and fixing base pass through the bearing and are connected and drive center post 4 and rod post I8, rod post II 9 and take place relative rotary motion at the during operation. The support frame 5 plays a role in guiding and supporting during work. And the limiting device 6 is used for accurately controlling the bending size during working.
And (3) bending process: the rotating disc is rotated, the central column rotates along with the central column, the gaps among the parts, the central column and the stick column I are adjusted to enable the front sections of the parts to move along the rotation direction of the central column under the action of friction force, the rear ends of the parts keep the original direction state under the reaction force of the stick column II, and therefore the front sections and the rear sections of the parts form 90-degree bending angles according to the rotation of the rotating disc.
The rotating speed of the rotating disk is controlled to control the part to rotate 90 degrees within a certain time range.
Although the fabrication method of the present invention has been described with reference to examples, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. A manufacturing process of a high-strength square U-shaped bolt is characterized by comprising the following steps: the method comprises the following steps:
(1) threading;
(2) heating, bending and forming;
(3) non-oxidation heat treatment;
the step (2) is realized by the following processes:
(2.1) to the two sides of the center of the part bend angle
Range heating, wherein: r is the radius of the bending inner angle, d is the diameter of the bolt, and A is the elongation of the part material;
(2.2) controlling the heating temperature of the part to be in the range of (Ac3+30 ℃) to (Ac3+100 ℃), wherein Ac3 is the austenite transformation temperature of the part material;
(2.3) controlling the bending forming time within a K multiplied by d second range under the condition of ensuring that the bend angle does not deform; wherein K is 1 to 1.3;
(2.4) controlling the cooling speed to be 80-120 ℃/h.
2. The manufacturing process according to claim 1, wherein: the part is made of 40Cr, and the heating temperature range is 810-880 ℃; the heating range is 41-50 mm on both sides of the center of the part corner; the bending time is in the range of 18-23 s.
3. The manufacturing process according to claim 1, wherein: the non-oxidation heat treatment adopts a salt bath quenching heat treatment method.
4. The manufacturing process according to any one of claims 1 to 3, wherein: the bending forming is formed by bending the following U-shaped bolt bending forming device, and the bending angle position does not deform;
the square U-shaped bolt bending forming device comprises a base (2), a rotating disc (3), a central column (4), a rod column I (8), a rod column II (9) and a supporting frame (5); the rotary disk is connected with the base through a bearing and can realize rotary motion, the central column is connected with the rotary disk retention, one end of a support frame groove retention part (1) is arranged, the other end of the part is retained through the central column and a groove on the stick column I, acting force is applied to the rotary disk during bending forming to enable the rotary disk to do rotary motion to drive the part to rotate, and the part is bent around the central column under the combined action of the central column, the stick column I and the stick column II.
5. The manufacturing process according to claim 4, wherein: in order to ensure that the stress is uniform when the part is bent, the rod column II is provided with a groove.
6. The manufacturing process according to claim 4, wherein: in order to adapt to the processing of parts of different models, the device further comprises a vertical plate (10), the stick column I and the stick column II are fixedly connected with the vertical plate through adjusting bolts (7), and the center distances of the stick column I, the stick column II and the central column are adjusted through adjusting the front and back positions of the adjusting bolts.
7. The manufacturing process according to any one of claims 5 to 6, wherein: in order to simplify the determination of the bending point, the device also comprises a limiting device (6), and when the end part of the part is fixedly arranged on the limiting device, the point between the stick column I and the central column is the bending point.
8. The manufacturing process according to claim 7, wherein: and the limiting device is provided with a plurality of limiting plates which are respectively used for determining different bending points.
9. The manufacturing process according to claim 7, wherein: the limiting device is provided with a scale and a limiting plate, and the limiting plate is moved to different scale positions to be used for determining different bending points.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910805021.3A CN110434564B (en) | 2019-08-29 | 2019-08-29 | Manufacturing process of high-strength square U-shaped bolt |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910805021.3A CN110434564B (en) | 2019-08-29 | 2019-08-29 | Manufacturing process of high-strength square U-shaped bolt |
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| CN110434564A CN110434564A (en) | 2019-11-12 |
| CN110434564B true CN110434564B (en) | 2021-08-06 |
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| CN112008339A (en) * | 2020-08-24 | 2020-12-01 | 山东汽车弹簧厂淄博有限公司 | Machining process for microalloying machining and strengthening U-shaped bolt |
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| CN108057743A (en) * | 2017-11-15 | 2018-05-22 | 郭弘 | A kind of bending machine that can control bend pipe angle |
| CN109570290A (en) * | 2018-10-25 | 2019-04-05 | 中国建筑第八工程局有限公司 | Tubular object extruding platform and its tubing angle pipe equipment for construction |
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2019
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Patent Citations (9)
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|---|---|---|---|---|
| CN102858477A (en) * | 2010-06-04 | 2013-01-02 | 武州工业株式会社 | Pipe bender and method for spiral pipe bending with the pipe bender |
| RU105204U1 (en) * | 2010-12-13 | 2011-06-10 | Василий Григорьевич Двоенкин | TUBE BENDER FOR THIN WALL PIPES |
| CN203955804U (en) * | 2014-06-30 | 2014-11-26 | 江苏民森机械有限公司 | Simple U-shaped bending machine |
| CN104259271A (en) * | 2014-09-17 | 2015-01-07 | 贵州航天新力铸锻有限责任公司 | Bending device and method for machining U-shaped bolt by use of bending device |
| CN106925642A (en) * | 2015-12-31 | 2017-07-07 | 天津市深呼吸自行车业有限公司 | A kind of automatic charging bending machine |
| CN205732402U (en) * | 2016-05-17 | 2016-11-30 | 厦门美驰汽配工业有限公司 | A kind of Bus Frame angle pipe equipment |
| CN206215713U (en) * | 2016-12-07 | 2017-06-06 | 绍兴赛得空调设备有限公司 | A kind of copper pipe apparatus for bending |
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| CN109570290A (en) * | 2018-10-25 | 2019-04-05 | 中国建筑第八工程局有限公司 | Tubular object extruding platform and its tubing angle pipe equipment for construction |
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| CN110434564A (en) | 2019-11-12 |
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