CN110369495B - Cross wedge rolling technology for pre-distribution and centralized forming - Google Patents
Cross wedge rolling technology for pre-distribution and centralized forming Download PDFInfo
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- CN110369495B CN110369495B CN201910669057.3A CN201910669057A CN110369495B CN 110369495 B CN110369495 B CN 110369495B CN 201910669057 A CN201910669057 A CN 201910669057A CN 110369495 B CN110369495 B CN 110369495B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/024—Rolls for bars, rods, rounds, tubes, wire or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/028—Variable-width rolls
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Abstract
The invention relates to a cross wedge rolling technology for pre-divided material centralized forming, which comprises the following process steps: heating the bar to rolling temperature, placing the bar into a mold waiting area, starting a rolling mill mold to rotate under the drive of a rolling mill, driving the rolling mill mold to rotate under the action of friction force to drive the bar to rotate and start rolling, wedging a radial-2 pre-distributing section into a radial-2 pre-distributing section, widening a radial-2 pre-distributing section, forming a disc-1, forming a disc-2 pre-distributing section into a radial-1, wedging a radial-3 pre-distributing section into a radial-1, widening a radial-3 pre-distributing section into a radial-1, turning a head of the radial-3 pre-distributing section into a radial-1, forming a radial-2, wedging a radial-3 into a radial-1, forming a radial-2, forming a radial-3, widening a disc-1, stacking a radial-1, disc-1, forming a radial-2, disc-2, And (3) performing radial-3 centralized forming and finishing product blanking and rolling. The invention overcomes the defects of the prior art, ensures the material distribution to be balanced, saves the material, improves the quality, facilitates the processing and improves the material utilization rate.
Description
Technical Field
The invention relates to the technical field of cross wedge rolling, in particular to a cross wedge rolling technology for pre-material distribution centralized forming.
Background
When the existing multi-step shaft part blank is rolled by cross wedge rolling, the forming process is to form one by one from the middle to two ends, and each step is formed at an independent position in the circumferential direction of the roller, namely each step is formed in different circumferential directions of the roller. The temperature of the blank is gradually reduced in the rolling process, namely the temperature of the blank is different in the forming process of each stage on the circumferential direction of the roller in the rolling process, the sizes of the blank in a hot state are different when the blank is cooled to the same temperature, the sizes of the blank in the hot state are different in the principle of thermal expansion and cold contraction, the positions of the blank in the circumferential direction of the roller are different in each step forming stage, so that the size of the product is unbalanced, and the blank is designed to have large allowance, serious material waste and high machining cost for ensuring that the machining allowance is sufficient.
For example, in reality, to form the part shown in fig. 1, the prior art would typically employ the rolling process of the fig. 2 technique: the bar is heated to the rolling temperature and then placed in a mold material waiting area, a rolling mill mold is started to rotate under the driving of a rolling mill, the mold drives the bar to rotate under the action of friction force to start rolling, a diameter-2 pre-distributing section is wedged into a diameter-2 pre-distributing section to be widened, the diameter-2 pre-distributing section is formed into a disc-1, a disc-2 is formed into a diameter-1, a diameter-3 pre-distributing section is wedged into a diameter-1, a diameter-3 pre-distributing section is widened into a diameter-1, a diameter-3 pre-distributing section is formed into a diameter-2 by wedging, a diameter-2 is widened into a diameter-1, a diameter-3 is wedged into a diameter-1, a diameter-3 is widened into a diameter-1, and a product is formed through-3 forming and then is rolled. It can be seen from the above process that the whole rolling process can be divided into-2 material distribution-disc-1, disc-2 forming-diameter-1, -3 material distribution-diameter-2 forming-diameter-1 and-3 forming, and the positions of the different shaft diameters of the whole product formed in the circumferential direction of the die are different and the material distribution and forming are performed alternately.
Because the forming process is one-by-one forming from the middle to the two ends, the cost of the long mold occupying the roll surface is high, and the processing capacity of the equipment is limited. Because the position is different in the roll week in every step shaping stage, cause the difference direct reaction of the different circumferential position of mould itself to cause the geometric difference of each axle diameter of product also to be higher to rolling equipment requirement simultaneously on the product, the adjustment degree of difficulty is great, and product dimensional stability is relatively poor and wedge cross rolling can produce the stub bar when the last shaping in both ends and certainly cause the material waste, to above problem, await the improvement urgently.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a pre-material-distribution centralized forming wedge cross rolling technology, which has the advantages of balanced material distribution, material saving, quality improvement, convenience in processing and material utilization rate improvement.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a pre-divided material centralized forming cross wedge rolling technology is characterized in that a product formed by the cross wedge rolling technology comprises two convex discs which are distributed at intervals along the axial direction and are respectively a disc-1 and a disc-2, the disc-1 and the disc-2 are connected through a shaft diameter of a diameter-2, the shaft diameter of the diameter-1 is arranged on one side of the left end of the disc-1, and the shaft diameter of the diameter-3 is arranged on one side of the right end of the disc-2.
The wedge cross rolling technology comprises the following process steps:
(1) taking a bar to be processed, heating a bar blank to a rolling temperature, and then putting the bar blank into a material waiting area of a rolling mill die;
(2) starting a rolling mill die, starting to rotate under the driving of a rolling mill, and driving a bar to rotate to start rolling under the action of friction force by the die;
(3) wedging the upper diameter-2 pre-distributing section of the bar into the hole pattern of the die, and finishing the forming of the diameter-2 pre-distributing section after the diameter-2 pre-distributing section is widened;
(4) pre-material distribution and molding of an upper disc-1 and a disc-2 of the bar;
(5) wedging the pre-distributing section of the diameter-1 and the diameter-3 on the bar into the hole pattern of the die, widening the pre-distributing section of the diameter-1 and the diameter-3, turning over the broken ends of the pre-distributing section of the diameter-1 and the diameter-3, and completing the forming of the pre-distributing section of the diameter-1 and the diameter-3;
(6) the diameter-1, the diameter-2 and the diameter-3 on the bar are respectively wedged into the hole pattern of the die, the diameter-1, the diameter-2 and the diameter-3 are widened, and the disc-1 and the disc-2 are stacked;
(7) and (3) performing centralized forming on the diameter-1, the disc-1, the diameter-2, the disc-2 and the diameter-3, and finally finishing blanking and rolling of the product.
As an improvement, in the step (1), the bar is heated by adopting a medium-frequency induction diathermanous electric furnace, the heating temperature is controlled to be 1000 +/-10 ℃, so that the surface of the rolled part is smooth and uniform, the oxidation is less, the parallelism of each step surface is good, and the error is small.
As an improvement, in the step (2), the two ends of the roller surface of the die are wedged into the sections to be provided with the positioning ribs, and the bar is wedged into the hole of the die through the positioning ribs, so that the bar is positioned at the center of the hole of the die, and the blank cannot incline towards one end.
As an improvement, before rolling and forming in the step (2), the circumferential same position of the rolling mill die roller and the temperature of each shaft section of the bar are ensured to be the same.
The invention has the following advantages: the invention realizes the material distribution or the forming of multiple steps in the same rolling section, avoids the uneven material distribution of products caused by the front-back temperature difference and the mandrel error in the same working section in the rolling process, ensures the balanced material distribution, reduces the difficulty of equipment adjustment, ensures the product size to be more balanced, reduces the size balance error from the original 1.5mm to 0.5mm, thereby reducing the blank design machining allowance by more than 1mm, saving the materials, improving the quality and facilitating the machining, reduces the blank material consumption by more than 10 percent according to the sample, reduces the rejection rate by 0.1 percent, reduces the single side of the blank machining allowance by 1mm, reduces the machining cost by 40 percent (referring to the turning machining of an excircle and a shoulder), occupies 1028.07mm in the new design, occupies 1284.88mm in the original design, reduces 256.81mm in the roll surface occupation, reduces the cost of a mold, and improves the machining capacity range of the equipment by 20 percent. The material distribution section is additionally provided with a material reserved section turning design, and the two end diameters in the forming widening section adopt a reverse rolling design, so that the production of rolling stub bars is avoided, and the material utilization rate is improved by more than 30%.
Drawings
FIG. 1 is a schematic view of the structure of a machined part according to the present invention.
FIG. 2 is a schematic diagram of the conventional cross wedge rolling technique of the present invention.
FIG. 3 is a schematic representation of the cross wedge rolling forming technique disclosed in the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
In the specific implementation of the invention, the cross wedge rolling technology for pre-divided material centralized forming comprises two convex discs which are distributed at intervals along the axial direction and are respectively a disc-1 and a disc-2, wherein the disc-1 and the disc-2 are connected through the shaft diameter of the diameter-2, the shaft diameter of the diameter-1 is arranged on one side of the left end of the disc-1, and the shaft diameter of the diameter-3 is arranged on one side of the right end of the disc-2.
The wedge cross rolling technology comprises the following process steps:
(1) taking a bar to be processed, heating the bar by adopting a medium-frequency induction diathermanous furnace, controlling the heating temperature to be 1000 +/-10 ℃, enabling the surface of a rolled part to be smooth and uniform, reducing oxidation, ensuring good parallelism of each step surface and small error, heating a bar blank to the rolling temperature, and then putting the bar blank into a material waiting area of a rolling mill die;
(2) starting a rolling mill die, mounting positioning ribs on wedging sections at two ends of a die roll surface, wedging a bar into a die hole pattern through the positioning ribs, enabling the bar to be positioned at the center of the die hole pattern, enabling a blank not to incline towards one end, ensuring that the blank is circumferentially positioned and the temperatures of shaft sections of the rolled blank are the same, starting to rotate under the driving of the rolling mill, and driving the bar to rotate to start rolling by the die under the action of friction force;
(3) wedging the upper diameter-2 pre-distributing section of the bar into the hole pattern of the die, and finishing the forming of the diameter-2 pre-distributing section after the diameter-2 pre-distributing section is widened;
(4) pre-material distribution and molding of an upper disc-1 and a disc-2 of the bar;
(5) wedging the pre-distributing section of the diameter-1 and the diameter-3 on the bar into the hole pattern of the die, widening the pre-distributing section of the diameter-1 and the diameter-3, turning over the broken ends of the pre-distributing section of the diameter-1 and the diameter-3, and completing the forming of the pre-distributing section of the diameter-1 and the diameter-3;
(6) the diameter-1, the diameter-2 and the diameter-3 on the bar are respectively wedged into the hole pattern of the die, the diameter-1, the diameter-2 and the diameter-3 are widened, and the disc-1 and the disc-2 are stacked;
(7) and (3) performing centralized forming on the diameter-1, the disc-1, the diameter-2, the disc-2 and the diameter-3, and finally finishing blanking and rolling of the product.
From the process, the product pre-distribution is relatively and intensively finished at the front section of the die, the shaft diameter forming is intensively and simultaneously finished at the tail part of the die, the end heads of the pre-distribution sections of the diameter-1 and the diameter-3 are added for turning over in the pre-distribution process, and the widening of the forming sections of the diameter-1 and the diameter-3 adopts reverse rolling (widening from outside to inside) to eliminate the stub bar generated by the original rolling mode.
The technical description shows that the product has a schematic structure diagram of three-diameter and two-disk, is not limited to the three-diameter and two-disk, and can realize multi-diameter and multi-disk centralized forming rolling in practical use.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (4)
1. A pre-divided material centralized forming cross wedge rolling technology is characterized in that a cross wedge rolling technology forming product comprises two convex discs which are distributed at intervals along the axial direction, namely a disc-1 and a disc-2, the disc-1 and the disc-2 are connected through a shaft diameter of a diameter-2, the shaft diameter of the diameter-1 is arranged on one side of the left end of the disc-1, the shaft diameter of a diameter-3 is arranged on one side of the right end of the disc-2, and the cross wedge rolling technology comprises the following process steps:
(1) taking a bar to be processed, heating the bar to a rolling temperature, and then putting the bar into a material waiting area of a rolling mill die;
(2) starting a rolling mill die, starting to rotate under the driving of a rolling mill, and driving a bar to rotate to start rolling under the action of friction force;
(3) wedging the upper diameter-2 pre-distributing section of the bar into the hole pattern of a rolling mill die, and finishing the forming of the diameter-2 pre-distributing section after the diameter-2 pre-distributing section is widened;
(4) pre-material distribution and molding of an upper disc-1 and a disc-2 of the bar;
(5) wedging the pre-distributing section of the diameter-1 and the diameter-3 on the bar into the hole pattern of a rolling mill die, widening the pre-distributing section of the diameter-1 and the diameter-3, turning over the broken ends of the pre-distributing section of the diameter-1 and the diameter-3, and completing the forming of the pre-distributing section of the diameter-1 and the diameter-3;
(6) the diameter-1, the diameter-2 and the diameter-3 of the bar are respectively wedged into the hole pattern of a rolling mill die, the diameter-1, the diameter-2 and the diameter-3 are widened, and the disc-1 and the disc-2 are piled;
(7) and (3) performing centralized forming on the diameter-1, the disc-1, the diameter-2, the disc-2 and the diameter-3, and finally finishing blanking and rolling of the product.
2. The cross wedge rolling technique for concentrated molding of pre-divided materials according to claim 1, characterized in that: in the step (1), the bar is heated by a medium-frequency induction diathermanous electric furnace, and the heating temperature is controlled to be 1000 +/-10 ℃.
3. The cross wedge rolling technique for concentrated molding of pre-divided materials according to claim 1, characterized in that: and (3) wedging sections at two ends of the roller surface of the rolling mill die in the step (2) to install positioning ribs, and wedging the bar into the hole pattern of the rolling mill die through the positioning ribs.
4. The cross wedge rolling technique for concentrated molding of pre-divided materials according to claim 1, characterized in that: and (3) ensuring that the circumferential direction of the rolling mill die is in the same position and the temperature of each shaft section of the bar is the same before rolling in the step (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910669057.3A CN110369495B (en) | 2019-07-24 | 2019-07-24 | Cross wedge rolling technology for pre-distribution and centralized forming |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910669057.3A CN110369495B (en) | 2019-07-24 | 2019-07-24 | Cross wedge rolling technology for pre-distribution and centralized forming |
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| Publication Number | Publication Date |
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| CN110369495A CN110369495A (en) | 2019-10-25 |
| CN110369495B true CN110369495B (en) | 2020-11-03 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CS185515B1 (en) * | 1976-10-20 | 1978-10-31 | Jiri Talafous | Wedge-shaped tool for manufacture especially of long rolled products by transversal tapered rolling |
| JPS58179527A (en) * | 1982-04-15 | 1983-10-20 | Nissan Motor Co Ltd | Cross rolling working method |
| CN100435999C (en) * | 2006-12-12 | 2008-11-26 | 北京科技大学 | Multi-wedge synchronizing smooth butte rolling method for rolling same diameter axle type pieces by cross wedge rolling |
| CN102688908B (en) * | 2012-06-10 | 2014-07-23 | 吉林大学 | Designing method for cross wedge rolling mould of conical surface stepped shaft part |
| CN105328088B (en) * | 2015-11-06 | 2017-04-26 | 宁波大学 | Cross wedge rolling end forming method for closing and opening united rolled stub-bar-free shaft piece |
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Denomination of invention: A Cross Wedge Rolling Technology for Pre splitting Concentrated Forming Effective date of registration: 20221024 Granted publication date: 20201103 Pledgee: Laiwu branch of China Postal Savings Bank Co.,Ltd. Pledgor: SHANDONG TAIJIN PRECISION FORGING CO.,LTD. Registration number: Y2022980019329 |