CN210253557U

CN210253557U - Rolled hole pattern structure of TZM molybdenum alloy pipe

Info

Publication number: CN210253557U
Application number: CN201921326640.6U
Authority: CN
Inventors: 陈登武
Original assignee: Zhejiang Jiaxiang Precision Machinery Technology Co ltd
Current assignee: Zhejiang Jiaxiang Precision Machinery Technology Co ltd
Priority date: 2019-08-15
Filing date: 2019-08-15
Publication date: 2020-04-07
Anticipated expiration: 2029-08-15

Abstract

The utility model discloses a TZM molybdenum alloy pipe rolling pass structure, the rolling pass is enclosed to close by the last groove of top roll and the lower groove of bottom roll and is formed, goes up groove and groove longitudinal symmetry arrangement down to rolling center establishes the coordinate system as the original point, go up the groove and include along the upper left groove and the upper right groove of Y axle mutual symmetry, the upper left groove is drawn by first eccentric circle and second eccentric circle for supplementary circle and is formed. The utility model discloses can effectively improve rolling stability and the yield to molybdenum alloy pipe.

Description

Rolled hole pattern structure of TZM molybdenum alloy pipe

Technical Field

The utility model relates to a rolling pass, especially a rolling pass structure of TZM molybdenum alloy pipe.

Background

The conventional way of cold rolling round tubes is that a manufacturer draws the corresponding base circle size according to the parameters of a cold rolling mill and a tube, and then rolls the round tube by taking the base circle as a cold rolling pass. The molybdenum titanium zirconium alloy (TZM) is an alloy which is formed by adding a certain amount of Ti and zr into molybdenum and has high temperature resistance and corrosion resistance, compared with the traditional zirconium alloy, the molybdenum titanium zirconium alloy has the advantages of good room temperature and excellent high-temperature mechanical property and corrosion resistance, and the molybdenum titanium zirconium alloy is researched on a new generation accident tolerance fuel cladding material and replaces the traditional zirconium alloy to be used as a cladding material of a fuel rod at present. However, the molybdenum titanium zirconium alloy has the characteristics of high melting point, high strength, good elastic modulus and good high-temperature mechanical property, so that the rolling pass which is conventionally used for a round tube cannot well finish the cold rolling process for the outer surface of the molybdenum alloy tube, and the rolling pass which is specially used for the molybdenum alloy tube does not exist in the market, so that the rolled molybdenum alloy tube has the problems of low yield and poor surface quality, and cannot meet the current market requirement. Therefore, there is a need for a rolling pass that improves rolling stability and yield of molybdenum alloy tubes.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a rolled pass structure of TZM molybdenum alloy pipe. The method can effectively improve the rolling stability and yield of the molybdenum alloy pipe.

The technical scheme of the utility model: a TZM molybdenum alloy tube rolling pass structure is characterized in that a rolling pass is formed by enclosing an upper rolling groove of an upper roller and a lower rolling groove of a lower roller, the upper rolling groove and the lower rolling groove are arranged vertically and symmetrically, a coordinate system is established by taking a rolling center as an original point, the upper rolling groove comprises an upper left rolling groove and an upper right rolling groove which are mutually symmetrical along a Y axis, and the upper left rolling groove is drawn by taking a first eccentric circle and a second eccentric circle as auxiliary circles; the center of the first eccentric circle is formed by the deviation of a rolling center along the Y axis, and the upper end of the first eccentric circle is internally tangent to the base circle; the circle center of the second eccentric circle is formed by respectively offsetting the rolling center along the X axis and the Y axis, and the second eccentric circle and the first eccentric circle are internally tangent at a second quadrant; and the tangent point between the first eccentric circle and the second eccentric circle is taken as a midpoint, and the upper left rolling groove is formed by connecting a second eccentric circle curve close to one side of the X axis and a first eccentric circle curve close to one side of the Y axis in the second quadrant.

In the rolled pass structure of the TZM molybdenum alloy pipe, the eccentricity between the base circle and the first eccentric circle is 0.03-0.1 mm.

In the rolled pass structure of the TZM molybdenum alloy pipe, the transverse distance between the center of the second eccentric circle and the origin is 0.05-1.1 mm, and the longitudinal distance between the center of the second eccentric circle and the origin is 5.5-6.5 mm.

In the rolled pass structure of the TZM molybdenum alloy pipe, the circle center of the first eccentric circle and the circle center of the second eccentric circle form a guide line after connection, and the second eccentric circle and the first eccentric circle are inscribed in the second quadrant along the guide line.

Compared with the prior art, the utility model discloses use the base circle as the auxiliary circle of rolling groove when designing to obtain the rolling pass of upper rolling groove and lower rolling groove through eccentric and external diameter optimization on its basis, make the utility model discloses can evenly distribute the rolling force that the rolling pass caused to molybdenum alloy pipe when cold rolling on the external diameter surface of pipe, thereby alleviate and cause the unevenness or the fracture phenomenon of pipe wall surface because of the atress inequality when the pipe is rolled, improve the utility model discloses rolling stability and yield to molybdenum alloy pipe; after the rolling stability of the molybdenum alloy pipe is improved, the size and the position of the roller and the pipe blank can be conveniently controlled by an operator, so that the size precision and the surface roughness of the rolled molybdenum alloy pipe are effectively improved; the rolling stability and the rolling effect of the rolling pass on the molybdenum alloy pipe can be further improved by optimizing the circle center positions of the first eccentric circle and the second eccentric circle, so that the outer diameter size precision of the molybdenum alloy pipe after rolling can reach +/-0.05 mm, and the roughness of the outer surface of the pipe wall can be better than Ra6.4 mu m. Therefore, the utility model discloses can effectively improve rolling stability and the yield to the molybdenum alloy pipe.

Drawings

FIG. 1 is a cross-sectional view of an upper roll and a lower roll;

fig. 2 is a schematic diagram of rolling pass of the present invention.

The labels in the figures are: 1-upper rolling groove, 2-lower rolling groove, 3-base circle, 4-first eccentric circle, 5-second eccentric circle and 6-guide line.

Detailed Description

The following description is made with reference to the accompanying drawings and examples, but not to be construed as limiting the invention.

Examples are given. A TZM molybdenum alloy pipe rolling pass structure is formed as shown in figure 1, wherein a rolling pass is formed by enclosing an upper rolling groove 1 of an upper roller and a lower rolling groove 2 of a lower roller, the upper rolling groove 1 and the lower rolling groove 2 are arranged up and down symmetrically along a rolling center (the rolling center is the design center of a cold-rolled pipe), a coordinate system is established by taking the rolling center as an origin, the upper rolling groove 1 comprises an upper left rolling groove and an upper right rolling groove which are mutually symmetrical along a Y axis, and the upper left rolling groove is drawn by taking a first eccentric circle 4 and a second eccentric circle 5 as auxiliary circles; the center of the first eccentric circle 4 is formed by offsetting the rolling center along the Y-axis negative direction, and the upper end of the first eccentric circle 4 is inscribed with the base circle 3 (the base circle 3 is drawn by a manufacturer according to the conventional cold rolling process according to field parameters, and the center of the base circle 3 is the rolling center); the circle center of the second eccentric circle 5 is formed by respectively offsetting the rolling center along the positive direction of the X axis and the negative direction of the Y axis, and the second eccentric circle 5 and the first eccentric circle 4 are inscribed in the second quadrant; and the tangent point between the first eccentric circle 4 and the second eccentric circle 5 is taken as a midpoint, and the upper left rolling groove is formed by connecting a curve of the second eccentric circle 5 close to one side of the X axis and a curve of the first eccentric circle 4 close to one side of the Y axis in the second quadrant.

The eccentricity between the base circle 3 and the first eccentric circle 4 is 0.03-0.1 mm.

The transverse distance between the center of the second eccentric circle 5 and the origin is 0.05-1.1 mm, and the longitudinal distance between the center of the second eccentric circle 5 and the origin is 5.5-6.5 mm.

The center of the first eccentric circle 4 and the center of the second eccentric circle 5 form a guide line 6 after being connected, and the second eccentric circle 5 and the first eccentric circle 4 are inscribed at a second quadrant along the guide line 6.

The utility model discloses a theory of operation: the utility model discloses at the during operation, the pipe of molybdenum alloy pipe is along rolling central line direction horizontal migration under feeding device's promotion, and the molybdenum alloy pipe is after removing the certain distance at every turn, and the top roll is rolled forward with the molybdenum alloy pipe along the rolling mill slide under the drive of roll chi wheel in opposite directions to roll through top groove 1 and lower groove 2 to the surface of pipe. Go up rolling groove 1 and rolling groove 2 down in rolling process, through using the base circle to optimize the centre of a circle and the external diameter of rolling pass as the auxiliary circle, can make and go up rolling groove 1 and rolling groove 2 down can be with rolling force evenly distributed at the outer wall surface of pipe to avoid the pipe because of the uneven surface crack or the defect that causes of atress, improved the utility model discloses rolling stability and rolling precision are managed to the molybdenum alloy. Through the eccentricity and radially attach the optimization of relief angle, can further improve the utility model discloses to the rolling effect of molybdenum alloy pipe, make its external diameter size precision after rolling can reach within 0.05mm, the roughness of pipe wall surface can be superior to Ra6.4 mu m.

Claims

1. A rolling pass structure of a TZM molybdenum alloy pipe is characterized in that the rolling pass structure is formed by enclosing an upper rolling groove (1) of an upper roller and a lower rolling groove (2) of a lower roller, the upper rolling groove (1) and the lower rolling groove (2) are arranged vertically and symmetrically, and the rolling pass structure is characterized in that: establishing a coordinate system by taking a rolling center as an original point, wherein the upper rolling groove (1) comprises an upper left rolling groove and an upper right rolling groove which are mutually symmetrical along a Y axis, and the upper left rolling groove is formed by drawing a first eccentric circle (4) and a second eccentric circle (5) as auxiliary circles; the circle center of the first eccentric circle (4) is formed by offsetting a rolling center along the Y axis, and the upper end of the first eccentric circle (4) is internally tangent to the base circle (3); the circle center of the second eccentric circle (5) is formed by respectively offsetting rolling centers along an X axis and a Y axis, and the second eccentric circle (5) and the first eccentric circle (4) are internally tangent at a second quadrant; and the tangent point between the first eccentric circle (4) and the second eccentric circle (5) is taken as a midpoint, and the upper left rolling groove is formed by connecting a curve of the second eccentric circle (5) close to one side of the X axis and a curve of the first eccentric circle (4) close to one side of the Y axis in the second quadrant.

2. The rolled pass structure of a TZM molybdenum alloy tube of claim 1, wherein: the eccentricity between the base circle (3) and the first eccentric circle (4) is 0.03-0.1 mm.

3. The rolled pass structure of a TZM molybdenum alloy tube of claim 1, wherein: the transverse distance between the circle center of the second eccentric circle (5) and the original point is 0.05-1.1 mm, and the longitudinal distance between the circle center of the second eccentric circle (5) and the original point is 5.5-6.5 mm.

4. The rolled pass structure of a TZM molybdenum alloy tube of claim 1, wherein: the center of the first eccentric circle (4) and the center of the second eccentric circle (5) form a guide line (6) after being connected, and the second eccentric circle (5) and the first eccentric circle (4) are inscribed in the second quadrant along the guide line (6).