CN112058937A - Long hollow tube inner wall thinning forming method - Google Patents
Long hollow tube inner wall thinning forming method Download PDFInfo
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- CN112058937A CN112058937A CN202010743920.8A CN202010743920A CN112058937A CN 112058937 A CN112058937 A CN 112058937A CN 202010743920 A CN202010743920 A CN 202010743920A CN 112058937 A CN112058937 A CN 112058937A
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- long hollow
- wall
- hollow tube
- hollow pipe
- forming
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
Abstract
The invention relates to the technical field of plastic forming, in particular to a method for thinning and forming an inner wall of a long hollow pipe. The method comprises a spinning machine and a three-roller skew rolling mill, and comprises the following specific steps: firstly, locally thinning the inner wall of the long hollow tube by adopting an internal spinning process on a spinning machine so as to ensure that the wall thickness of the end part of the long hollow tube is greater than that of the middle section of the long hollow tube; and secondly, processing the outer wall of the long hollow pipe processed in the first step by adopting a skew rolling process on a three-roller skew rolling machine so as to reduce the end positioning outer diameter of the long hollow pipe and form a necking. The invention provides a novel combined forming process, which is characterized in that a long hollow pipe is locally thinned, and then the end part is subjected to necking process, so that the necking part of a part can meet the requirement of thickening amount, the whole part can be subjected to cold forming, blanks are not cut, and the material utilization rate is high.
Description
Technical Field
The invention relates to the technical field of plastic forming, in particular to a method for thinning and forming an inner wall of a long hollow pipe.
Background
The end reducing and thickening necking process of the traditional hollow pipe part (such as an airplane pull rod) is carried out by adopting a hot necking process, the end of the part is locally hot-formed by the process, the consistency of the microstructure of the part is damaged, and therefore the formed part needs to be subjected to heat treatment, and the process is complex and high in cost. The necking is carried out by adopting a cold forging process, a forging die is divided into four parts, and a part rotating at a high speed is forged by using one die each time to realize necking.
Therefore, a new process is required to be found for carrying out the end reducing, thickening and necking process of the long hollow pipe, for example, a forming method is disclosed in a patent of Chinese patent No. CN102581016B, No. 2014.03.05, entitled "processing method for thickening local position of steel pipe", and comprises the following steps: 1) the die (1) provided with the hydraulic ejector rod is concentrically arranged on a guide rail at one end of a rotary rolling mill 4; 2) heating the position of the steel pipe (3) needing to be thickened in an induction heating furnace at the temperature of 900-1200 ℃; 3) transferring the steel pipe (3) to a rotary rolling machine for positioning and clamping; 4) starting the rotary rolling machine to drive the steel pipe (3) to rotate, wherein the rotating speed n of the steel pipe is 175-200 r/min; 5) controlling the pushing operation of the mold, and thickening the thickened part of the steel pipe; 6) and when the heated part of the steel pipe (3) reaches the required thickening amount, stopping the rotary rolling mill (4) after the die (1) returns to the initial position, taking down the steel pipe (3), and finishing the thickening treatment of the steel pipe.
The forming method still has some problems, for the production of some parts with high size requirements, the thickening amount of the skew rolling mill is limited by a mould, the requirements are difficult to meet, in addition, the method is also a hot working process, the consistency of the microstructure of the part is still damaged, and therefore, the formed part needs to be subjected to heat treatment, and the process is complex and high in cost.
Disclosure of Invention
The invention aims to overcome the defects that the thickening amount of a skew rolling mill is limited by a die and is difficult to meet the requirements for the production of certain parts with high size requirements in the conventional reducing and thickening necking process of the end part of a hollow pipe.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for thinning and forming the inner wall of a long hollow tube comprises a spinning machine and a three-roller skew rolling mill, and comprises the following specific steps:
firstly, locally thinning the inner wall of the long hollow tube by adopting an internal spinning process on a spinning machine so as to ensure that the wall thickness of the end part of the long hollow tube is greater than that of the middle section of the long hollow tube;
and secondly, processing the outer wall of the long hollow pipe processed in the first step by adopting a skew rolling process on a three-roller skew rolling machine so as to reduce the end positioning outer diameter of the long hollow pipe and form a necking.
The invention combines the inner spinning process and the oblique rolling process, firstly, the inner wall of the long hollow tube is locally thinned through the inner spinning process, and then the end part of the outer wall of the long hollow tube is shrunk through the oblique rolling process, so that the shrunk part of the part can meet the requirement of thickening amount, the whole body can adopt cold forming, the problems of microstructure of hot forming and heat treatment are solved, the inner spinning process and the oblique rolling process are both plastic forming, blanks are not cut, and the material utilization rate is high.
Preferably, in the first step, the processing area of the spinning machine is the middle section of the long hollow pipe so as to reduce the wall thickness of the middle section of the long hollow pipe. The thickness of the end part of the long hollow pipe is kept unchanged, the spinning machine directly thins the middle section of the long hollow pipe, and the end part of the long hollow pipe has a thickening effect relatively.
Preferably, after the spinning machine processing, the ratio of the wall thickness of the middle section of the long hollow pipe to the wall thickness of the end part of the long hollow pipe is 0.2-0.8. The thinning of the wall thickness of the middle section of the long hollow pipe needs to be within a reasonable range so as to ensure the final forming quality, the surface forming quality is easily influenced by over-thin thickness, the deformation is easily caused, the ideal relative thickening requirement cannot be met by over-thick thickness, and the deformation in the next step of skew rolling is also not facilitated.
Preferably, in the first step, the inner wall of the middle section of the long hollow pipe is connected with the inner wall of the end part of the long hollow pipe through an inner conical surface, and the inner conical surface is used for rotary wheel transition. The inner conical surface is mainly used for feeding transition of the knob and is also used for smooth transition between the inner wall of the middle section of the long hollow pipe and the inner wall of the end part of the long hollow pipe.
Preferably, in the second step, the processing area of the three-high skew rolling mill is the end of the long hollow tube. The three-roller skew rolling mill directly carries out reducing and thickening necking processing on the outer wall, and the main processing area is the end part of the long hollow pipe, so that a better reducing and thickening effect can be achieved.
Preferably, the long hollow tube is cold-formed in both the processing in step one and the processing in step two. Because the deformation amount of the single deformation processing is small after the two deformation processing, a foundation is provided for cold forming, and a series of problems of hot forming, such as unbalanced microstructure, requirement of subsequent heat treatment and the like, can be eliminated.
The invention has the beneficial effects that: the invention combines the inner spinning process and the oblique rolling process, firstly, the inner wall of the long hollow tube is locally thinned through the inner spinning process, and then the end part of the outer wall of the long hollow tube is shrunk through the oblique rolling process, so that the shrunk part of the part can meet the requirement of thickening amount, the whole body can adopt cold forming, the problems of microstructure of hot forming and heat treatment are solved, the inner spinning process and the oblique rolling process are both plastic forming, blanks are not cut, and the material utilization rate is high.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the following drawings without inventive labor.
FIG. 1 is a schematic view of the construction of a long hollow tube according to the present invention;
FIG. 2 is a schematic structural view of a long hollow tube of the present invention after being processed by a spinning machine;
FIG. 3 is a schematic structural view of a long hollow tube after being processed by a three-roll skew rolling mill in the present invention.
Reference numerals: the device comprises a long hollow pipe 1, a long hollow pipe end 11, a long hollow pipe middle section 12, a spinning machine 2 and a three-roller skew rolling mill 3.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or may comprise the first and second features being in contact, not directly, but via another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The method for thinning and forming the inner wall of the long hollow tube according to the embodiment of the invention is described below with reference to the accompanying drawings.
Example (b): as shown in figures 1 to 3 of the drawings,
a method for thinning and forming the inner wall of a long hollow tube, wherein a long hollow tube 1 is a processing object, the processing object comprises a spinning machine 2 and a three-roller inclined rolling machine 3, and the method comprises the following specific steps:
firstly, locally thinning the inner wall of the long hollow tube by adopting an internal spinning process on a spinning machine so as to ensure that the wall thickness of the end part 11 of the long hollow tube is greater than that of the middle section 12 of the long hollow tube;
and secondly, processing the outer wall of the long hollow pipe processed in the first step by adopting a skew rolling process on a three-roller skew rolling machine so as to reduce the end positioning outer diameter of the long hollow pipe and form a necking.
According to the invention, through the combination of the internal spinning process and the skew rolling process, the inner wall of the long hollow pipe is locally thinned through the internal spinning process, and then the end part of the outer wall of the long hollow pipe is shrunk through the skew rolling process, so that the shrunk part of the part can meet the requirement of the thickened amount, and the long hollow pipe is cold-formed in the processing of the first step and the second step.
In the first step, the processing area of the spinning machine is the middle section of the long hollow pipe so as to reduce the wall thickness of the middle section of the long hollow pipe, the thickness of the end part of the long hollow pipe is kept unchanged, the spinning machine directly thins the wall thickness of the middle section of the long hollow pipe, and relatively, the end part of the long hollow pipe has a thickening effect. After the spinning machine is used for processing, the ratio of the wall thickness of the middle section of the long hollow pipe to the wall thickness of the end part of the long hollow pipe is 0.2-0.8, the wall thickness of the middle section of the long hollow pipe needs to be reduced within a reasonable range so as to ensure the final forming quality, the surface forming quality is easily influenced by over-thin thickness, the surface forming quality is easily distorted and deformed, and the ideal relative thickening requirement cannot be met by over-thick thickness, and the deformation in the next step of skew rolling is also not facilitated. In the first step, the inner wall of the middle section of the long hollow pipe is connected with the inner wall of the end part of the long hollow pipe through an inner conical surface, and the inner conical surface is mainly used for feeding transition of a knob and is also used for smooth transition between the inner wall of the middle section of the long hollow pipe and the inner wall of the end part of the long hollow pipe.
In the second step, the processing area of the three-roller skew rolling mill is the end part of the long hollow pipe, the three-roller skew rolling mill directly carries out reducing and thickening necking processing on the outer wall, and the main processing area is the end part of the long hollow pipe, so that a better reducing and thickening effect can be achieved.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A method for thinning and forming the inner wall of a long hollow tube is characterized by comprising a spinning machine and a three-roller inclined rolling machine, and comprises the following steps:
firstly, locally thinning the inner wall of the long hollow tube by adopting an internal spinning process on a spinning machine so as to ensure that the wall thickness of the end part of the long hollow tube is greater than that of the middle section of the long hollow tube;
and secondly, processing the outer wall of the long hollow pipe processed in the first step by adopting a skew rolling process on a three-roller skew rolling machine so as to reduce the end positioning outer diameter of the long hollow pipe and form a necking.
2. The method as claimed in claim 1, wherein in the first step, the processing area of the spinning machine is a middle section of the long hollow tube to reduce the wall thickness of the middle section of the long hollow tube.
3. The method as claimed in claim 1, wherein the ratio of the wall thickness of the middle section of the long hollow tube to the wall thickness of the end section of the long hollow tube after the spinning process is 0.2 to 0.8.
4. The method for thinning and forming the inner wall of the long hollow pipe as claimed in claim 1, wherein in the step one, the inner wall of the middle section of the long hollow pipe is connected with the inner wall of the end part of the long hollow pipe through an inner conical surface, and the inner conical surface is used for rotary wheel transition.
5. The method as claimed in claim 1, wherein in the second step, the processing area of the three-high skew rolling mill is the end of the long hollow tube.
6. The method for thinning and forming the inner wall of a long hollow tube according to any one of claims 1 to 5, wherein the long hollow tube is cold-formed in the processing of the first step and the second step.
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| CN202010743920.8A CN112058937A (en) | 2020-07-29 | 2020-07-29 | Long hollow tube inner wall thinning forming method |
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| CN202010743920.8A CN112058937A (en) | 2020-07-29 | 2020-07-29 | Long hollow tube inner wall thinning forming method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114570851A (en) * | 2022-05-05 | 2022-06-03 | 太原科技大学 | Forming process of seamless metal gas cylinder liner |
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| CN114570851A (en) * | 2022-05-05 | 2022-06-03 | 太原科技大学 | Forming process of seamless metal gas cylinder liner |
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Application publication date: 20201211 |