CN102009112B

CN102009112B - Method for thickening annular outer edge of circular plate material

Info

Publication number: CN102009112B
Application number: CN2010105183496A
Authority: CN
Inventors: 金俊松; 汤桃红; 夏巨谌; 胡国安; 王新云; 周孟祥
Original assignee: HUBEI TIANLUN MACHINERY CO Ltd; Huazhong University of Science and Technology
Current assignee: HUBEI LIOHO-TIANLUN MACHINERY CO LTD; Huazhong University of Science and Technology
Priority date: 2010-10-22
Filing date: 2010-10-22
Publication date: 2012-05-23
Anticipated expiration: 2030-10-22
Also published as: CN102009112A

Abstract

The invention relates to a method for thickening the annular outer edge of a circular plate material, and belongs to a method for forging and forming plates. The method for thickening the annular outer edge of the circular plate material solves the problems of rigorous blanking and overmany spinning passes in the conventional method for thickening the outer edge of the circular plate material. In the method for thickening the annular outer edge of the circular plate material, N rolled wheels are arranged on the outer edge of the circular plate material; an annular rolled groove is formed on each rolled wheel; the section of the rolled groove has an open rectangular shape; the circular plate material is positioned in the rolled groove and rotates around a longitudinal shaft of the circular plate material; the N rolled wheels feed and extrude the outer edge of the circular plate material radially and sequentially; and after one rolled wheel feeds and extrudes the outer edge of the circular plate material radially and withdraws, the next rolled wheel feeds and extrudes the outer edge of the circular plate material radially and withdraws, so that the annular outer edge of the circular plate material is thickened sequentially. When disk-shaped or annular parts are produced by the method, if an increased thickness is smaller, fewer steps can be adopted; in a forming process, the defect that the outer edge is not filled is overcome; and even if blanks are slightly small, wastes are still not formed and the blanking requirement is not reduced. Products produced by the method have strong strength and stable quality, are not influenced by a welding process, and saves materials and energy.

Description

Method for thickening annular outer edge of circular plate

Technical Field

The invention belongs to a plate forging forming method, and particularly relates to a method for thickening an annular outer edge of a circular plate.

Background

Spin forming techniques are commonly used to form solid cylindrical or disc shaped bodies of revolution. The spinning forming technology of the cylindrical part is researched by a few people, and the numerical simulation and the experimental research of the single-pass drawing spinning forming of the conical part, the forging technology 2010 and 35 (1): 44-49, (2); ② luodiyu, xiaqinxiang, deep drawing spinning cup making process parameter research based on orthogonal test, precision forming process, 2010 (2): 43-48; the thin-wall cylindrical part multi-pass ball spinning forming mechanism research, forging technology, 2010, 35 (2): 55-58; liu pottery, Longsiyuan, Libingbing, magnesium alloy cylindrical piece spinning forming process and die design, die technology, 2010 (2): 29-31; ponkun and Lijian, TA2 cylindrical part multi-pass spinning forming process based on finite element method, plastic engineering report, 2010, 17 (2): 39-45.

In connection with pipe forming, patent Z100806529.2 discloses a method of forming an end of a pipe by spinning the pipe about a longitudinal axis and heating the end of the pipe by moving the forming member back and forth along a series of curved paths to form the end of the pipe; patent ZL01144104.6 discloses a method for sealing a cliff of a large-diameter thin-wall pipe, which is to heat the sealing position of the pipe, and then seal the opening by three-wheel or four-wheel spinning and cut off the pipe.

In the aspect of spinning disk-shaped parts, Xiajin incense and the like develop a spinning forming technology of a belt pulley, (see: Xiajin incense, ChengXiquan and a device for spinning forming of the belt pulley. patent number: ZL 200720058970.2; Zhou Ci, Xiajin incense and the like. research of an embedded open numerical control system for a belt pulley spinning machine tool. machine tool and hydraulic pressure 2009, 37 (5): 11-14; Xiajin incense, Wangyang and the like. influence of spinning forming process parameters of a multi-wedge belt pulley on waist drum forming. die industry 2010, 36 (1): 26-31) drawing, namely, spinning and forming a part into the multi-wedge belt pulley; a V-shaped split spinning forming technology is researched for a yellow and bright part, Chenyunfei and the like (see: yellow and bright part, Yang Hei and the like; fractal spinning forming technology research progress, material science and process 2008, 16 (4): 476-. Although spinning studies are numerous, none of the above techniques relate to a method of thickening a circular slab.

Patents US5904060, US6016602A, WO9622847A, US6925713B and chinese patent application 95192246.7 disclose a method of using a rolling wheel with a V-shaped groove, spinning the edge of a circular plate material to thicken into a V shape by spinning for a plurality of times, and with the increase of the spinning pass, the opening angle of the V-shaped groove becomes larger and larger, and finally spinning into a rectangle. When the thickness is increased to be smaller, the method still needs to be subjected to multiple times of spinning; when the V shape is changed into the rectangle, if the blank is smaller, the filling outside of the wheel rim is easy to be insufficient, thereby forming waste products, and the blanking is over-sufficient, the over-large radial force of the rotary rolling can be caused, the bearing requirement of the main shaft is improved, the abrasion of the main shaft is accelerated, and the blanking is harsh.

Disclosure of Invention

The invention provides a method for thickening the annular outer edge of a circular plate, which solves the problems of harsh blanking and excessive spinning passes of the conventional method for thickening the annular outer edge of the circular plate and is used for thickening the edges of disc-shaped or annular parts such as flywheel gear ring blanks, belt pulley blanks and the like.

The invention relates to a method for thickening the annular outer edge of a circular plate, wherein N rolling wheels are arranged on the outer edge of the circular plate, each rolling wheel is provided with an annular rolling groove, the circular plate rotates around a self longitudinal axis, and N is more than or equal to 1; the method is characterized in that:

the N rolling wheels are sequentially fed to extrude the outer edge of the circular plate, after one rolling wheel is fed along the radial direction to extrude and withdraw, the next rolling wheel is fed along the radial direction to extrude and withdraw, and the annular outer edge of the circular plate is sequentially thickened;

the cross section of the rolling groove is in an open rectangle shape, and the round plate is positioned in the rolling groove.

The thickening method of the circular outer edge of the circular plate is characterized in that:

the number N of the rolling wheels is as follows:

wherein,

the numerical value in the parentheses is rounded upwards, the K is 1.015-1.020, the material plasticity is better, the value of the K is larger, and t is larger₀Is the initial thickness, t, of the circular plate_NIs the final thickness of the annular outer edge of the circular plate, d_NIs the final diameter of the circular plate, d is the diameter of the non-thickened part of the circular plate, d₀Initial diameter for circular sheet:

d_{0} = \sqrt{\frac{t_{N} (d_{N}^{2} - d^{2})}{t_{0}} + d^{2}};

the opening rectangle of the nth rolling wheel groove has the depth of (d)_n-d)/2，1≤n≤N；

In the formula, after the nth rolling wheel feeds, extrudes and retreats, the diameter d of the annular outer edge of the circular plate material_nComprises the following steps:

d_n＝(d_n-1+ d)/k-d, the deformation parameter k is:

width t of opening rectangle of nth rolling wheel groove_nComprises the following steps:

t_n＝k×(d_n-1-d)×t_n-1/(d_n-d)；

the feed amount of the nth rolling wheel is (d)_n-1-d_n) And/2, the feeding speed is 0.01-0.10 mm/rotation.

The method for thickening the annular outer edge of the circular plate is characterized in that:

the rotating speed of a main shaft for clamping the circular plate is 400-600 rpm.

When the spinning thickening method is adopted, the circular plate with better plasticity, such as 08AL, can be directly used for spinning; for circular plate materials with poor plasticity, for example, 45# steel needs to be subjected to spheroidizing annealing and then to spinning.

The invention is adopted to produce the disc-shaped or ring-shaped part with the thickness of the outer edge thicker than the middle part, if the added thickness is smaller, the disc-shaped or ring-shaped part can be finished by adopting fewer steps, in addition, the defect of incomplete outer edge filling does not exist in the forming process, the waste product can not be formed even if the blank is slightly smaller, and the requirement of blanking is reduced.

The invention has obvious advantages in producing disc-shaped or ring-shaped parts with the outer edge thickness thicker than the middle part, for example, when the flywheel disc is manufactured by the process, the gear ring blank and the connecting disc can be integrally formed, and then the gear ring is formed by machining or gear rolling. In the traditional production method, the connecting disc is formed by punching, the gear ring is formed by punching a thick plate into a ring shape, then the gear ring is cut into teeth, and finally the gear ring and the connecting disc are welded, so that the material utilization rate is less than 40%, and the welding is difficult to ensure the connection precision. Therefore, the product produced by the invention has high strength, stable quality, material saving and energy saving, and is not influenced by welding process.

Drawings

FIG. 1 is a schematic diagram of the forming of the present invention;

FIG. 2 is a schematic diagram of a four-pass spin thickening system;

FIG. 3(a) is a schematic view of a spinning symmetric thickening forming principle;

3(b) to 3(e) are schematic diagrams of four-pass spinning symmetric thickening forming process;

FIG. 4(a) is a schematic view of the asymmetric thickening formation principle;

fig. 4(b) to 4(e) are schematic diagrams of four-pass spinning asymmetric thickening forming process.

Detailed Description

The forming principle of the invention is shown in figure 1: the circular plate 2 is placed on the lower main shaft 3, the upper main shaft 1 descends and rotates together with the lower main shaft 3 after clamping the circular plate 2, the rolling wheel 4 with the annular rolling groove feeds along the radial direction until the circular plate is at a preset position and then exits, and the rolling wheel 4 rotates passively.

As shown in fig. 2, in one embodiment of the present invention, a first rolling wheel 4-1, a second rolling wheel 4-2, a third rolling wheel 4-3 and a fourth rolling wheel 4-4 are disposed at the outer edge of a circular plate; each rolling wheel is provided with an annular rolling groove, in the forming process, after the circular plate 2 is clamped by the upper main shaft 1 and the lower main shaft 3, the circular plate 2 rotates along with the main shafts, the 4 rolling wheels sequentially act, the first rolling wheel feeds and extrudes along the radial direction until the part outside the clamping of the main shafts of the circular plate 2 is thickened by spinning and then exits along the original path, and then the second rolling wheel 4-2, the third rolling wheel 4-3 and the fourth rolling wheel 4-4 sequentially execute the same action as the first rolling wheel 4-1 until the formed part of the plate is thickened to the final requirement.

As shown in fig. 3(a), when spinning, the middle plane 5 of the circular plate 2 is overlapped with the middle plane 6 of the rolling groove of the rolling wheel 4, so that symmetric spinning thickening can be realized.

The design of parameters related to the present invention will be described by taking the spinning symmetric thickening process shown in fig. 3(b) to 3(e) as an example.

The circular plate 2 is made of No. 35 steel and has the original thickness of t₀2.5mm, final thickness t of the rim after spinning_N8.5mm, diameter d 242mm, d_N＝260mm。

(1) Firstly, determining the initial diameter d of a circular plate₀：

d_{0} = \sqrt{\frac{t_{N} (d_{N}^{2} - d^{2})}{t_{0}} + d^{2}}

= 298.8 mm

Then determining that the spinning times N and the No. 35 steel have good plasticity, taking the initial value of K as 1.02,

therefore, 4 times of spinning is needed, and the value of the deformation parameter k is determined according to the value N:

= 1.019

(2) determining the diameter of the annular outer edge of each pass of the circular plate and the thickness of the annular outer edge of each pass of the circular plate;

as shown in fig. 3(b), the diameter d of the circular outer edge of the circular plate after the first spinning₁：

d₁＝(d₀+d)/k-d

＝(298.8+242)/1.019-242，

＝288.72mm

Thickness t of annular outer edge of circular plate after first spinning₁：

t₁＝k×(d₀-d)×t₀/(d₁-d)

＝1.019×(298.8-242)×2.5/(288.72-242)；

＝3.10mm

As shown in fig. 3(c), the diameter d of the circular outer edge of the circular plate after the second spinning₂：

d₂＝(d₁+d)/k-d

＝(288.72+242)/1.019-242，

＝278.82mm

The thickness t of the annular outer edge of the circular plate after the second spinning₂：

t₂＝k×(d₀-d)×t₀/(d₂-d)

＝1.019g(298.8-242)g2.5/(278.82-242)；

＝3.92mm

As shown in fig. 3(d), the diameter d of the circular outer edge of the circular plate after the third spinning₃：

d₃＝(d₂+d)/k-d

＝(278.82+242)/1.019-242，

＝269.12mm

The thickness t of the annular outer edge of the circular plate after the third spinning₃：

t₃＝k×(d₀-d)×t₀/(d₃-d)

＝1.019×(298.8-242)×2.5/(269.12-242)；

＝5.34mm

As shown in fig. 3(e), the diameter d of the circular outer edge of the circular plate after the fourth spinning₄＝d_N＝130mm，

The thickness t of the annular outer edge of the round plate after the fourth spinning₄＝t_N＝8.5mm；

Wherein t is_n/t_n-1＝λ_nFor the thickening ratio, (n is the number of times of thickening), considering the spinning closer to the front, the larger the ratio of the width to the thickness of the spun portion of the slab, i.e., (d)₀-d₀)/(2t_n-1) The larger the size, the more susceptible to destabilization, so there is λ_n-1≤λ_n≤1。

The feeding speed of each pass of rolling wheel is 0.02 mm/rotation; the rotating speed of the main shaft for clamping the circular plate in each pass is 500 rpm.

As shown in fig. 4(a), when spinning, the middle surface 5 of the circular plate 2 is not overlapped with the groove middle surface 6 of the rolling wheel 4, so that asymmetric spinning thickening can be realized. Fig. 4(b) to 4(e) are schematic diagrams of four-pass spinning asymmetric thickening forming process.

The parameters are designed as shown in fig. 4(b) to 4(e), and the same as the spinning symmetric thickening method shown in fig. 3(b) to 3 (e).

The feeding speed of each pass of rolling wheel is 0.01 mm/rotation; the rotating speed of the main shaft for clamping the circular plate in each pass is 600 rpm.

Claims

1. A method for thickening the annular outer edge of a circular plate comprises the steps that N rolling wheels are arranged on the outer edge of the circular plate, each rolling wheel is provided with an annular rolling groove, the circular plate rotates around a longitudinal shaft of the circular plate, and N is larger than or equal to 1; the method is characterized in that:

the section of the rolling groove is in an open rectangle shape, and the circular plate is positioned in the rolling groove;

the number N of the rolling wheels is as follows:

wherein,

d_{0} = \sqrt{\frac{t_{N} (d_{N}^{2} - d^{2})}{t_{0}} + d^{2}};

d_n＝(d_n-1+ d)/k-d, the deformation parameter k is:

t_n＝k×(d_n-1-d)×t_n-1/(d_n-d)；

2. The method for thickening the annular outer edge of the circular sheet according to claim 1, wherein: the rotating speed of a main shaft for clamping the circular plate is 400-600 rpm.