CN111230013A - Forging method of high-purity niobium rod - Google Patents

Abstract

The invention relates to a forging method of a high-purity niobium rod, which comprises the following steps: polishing the outer circumferential surface of the niobium ingot, wherein the polishing size allows steps to be arranged according to the surface quality, and the steps need to be obliquely covered and transited; forging the niobium ingot on a radial forging machine, wherein the pressing amount is 20-30 mm, the pulling speed is less than or equal to 1.5m/min, single-pass pulling is carried out, reciprocating forging is forbidden, a water pipe is opened in the whole process for spraying and cooling, dynamic real-time temperature measurement is carried out, the process temperature and the final temperature are less than or equal to 330 ℃, otherwise, the forging is stopped, the blank is lifted away from forging equipment, water is cooled for 15-20 min in water, the blank is subjected to up-and-down reciprocating movement, the water inlet depth is greater than or equal to 0.5m, the water-cooled blank is continuously forged and formed on the radial forging machine, the pressing amount is 5-10 mm, the pulling speed is less than or equal to 1.2m/min, single-pass pulling is carried out, reciprocating forging is forbidden, the water pipe is opened in the whole process for spraying and cooling, the straightening machine is rotated while the temperature is remained after the forging and the straightening, air cooling is tiled after the straightening is finished, the stacking is forbidden.

Description

Forging method of high-purity niobium rod

Technical Field

The invention belongs to the technical field of nonferrous metal processing, and particularly relates to a forging method of a high-purity niobium rod, which can not cause surface blueing and peeling during forging and can improve the surface quality and the yield.

Background

The high-purity niobium has a series of excellent performances such as high melting point, low steam pressure, good cold processing performance, high chemical stability, strong liquid metal and acid corrosion resistance and the like, and is mainly used for niobium sputtering target materials, superconducting accelerators, cavities of superconducting resonant cavities and the like.

The traditional high-purity niobium ingot processing method comprises extrusion, rolling, common forging and the like, the surface is often blued and skinned due to the heat effect, great difficulty is caused for subsequent cleaning, the outturn rate is reduced, meanwhile, the extrusion and rolling tool limits exist, the forming size range is limited, the forging efficiency on a common press or hammer is low, the hammer mark is large, the cost is high, and the surface quality and the yield are reduced due to the frequent blued and skinning.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a forging method of a high-purity niobium rod, so as to solve the problems of surface quality, yield, production efficiency and tool universality.

The technical solution of the present invention is achieved in that,

a forging method of a high-purity niobium rod comprises the following steps:

step 1), polishing the outer circumferential surface of a niobium ingot, wherein the turning size allows steps to be arranged according to the surface quality, and the steps need to be obliquely wrapped and transited;

step 2), placing the niobium ingot on a radial forging machine according to the set middle size for forging, wherein the reduction is 20-30 mm, the pulling speed is less than or equal to 1.5m/min, pulling in a single pass, prohibiting reciprocating forging, starting a water pipe in the whole process for spraying and cooling, dynamically measuring the temperature in real time, wherein the process temperature and the final temperature are less than or equal to 330 ℃, and otherwise, stopping forging;

step 3), when the final forging temperature of the niobium ingot in the step 2) reaches 330 ℃, immediately stopping forging, lifting the blank away from forging equipment, cooling in water for 15-20 min, and leaping up and down in a reciprocating manner, wherein the water inlet depth is more than or equal to 0.5 m;

step 4), continuously forging and forming the water-cooled blank on a radial forging machine, wherein the reduction is 5-10 mm, the drawing speed is less than or equal to 1.2m/min, drawing in a single pass, prohibiting reciprocating forging, and opening a water pipe for spraying and cooling in the whole process;

and 5) after forging and forming, straightening by a straightening machine while the residual temperature is still maintained, paving, cooling and airing the materials in a flat manner after straightening, and forbidding stacking.

By using the forging method, the surface is not blued and skinned, the surface quality is improved, the yield is improved, a universal hammer head is used on a radial forging machine, the investment of a tool is not required, and the manufacturing cost is reduced.

Detailed Description

The invention will be further illustrated and described with reference to specific examples.

Example 1: a forging method of a high-purity niobium rod forges a high-purity niobium ingot with phi of 330 mm on an 1800-ton radial forging machine to form a niobium rod with phi of 140 +/-1 mm, and the specific production process is as follows:

step 1), polishing the outer circumferential surface of the niobium ingot to a diameter of 320 mm.

Step 2), forging the niobium ingot to phi 220mm by using an R100 hammer on an 1800-ton radial forging machine, and performing a deformation process: phi 320-phi 300-phi 270-phi 240-phi 220mm, the drawing speed is 1.3-1.5m/min, the single-pass drawing is performed, the reciprocating forging is forbidden, the water pipe is opened for spraying and cooling in the whole process, the temperature is dynamically measured in real time, the forging is stopped when the temperature rises to 320 ℃ until the temperature rises to 220mm phi.

And 3) lifting the blank away from the forging equipment, cooling in water for 15min, and reciprocating up and down to a depth of more than or equal to 1.5 m.

Step 4), continuously forging and forming the water-cooled blank on a radial forging machine, wherein the deformation process is as follows: phi 220-phi 200-phi 180-phi 170-phi 160-phi 150-phi 145-phi 140mm, the drawing speed is less than or equal to 1.0-1.2 m/min, single-pass drawing is carried out, reciprocating forging is forbidden, a water pipe is opened in the whole process for spraying and cooling, and the final forging temperature is 200 ℃.

And 5) after forging and forming, straightening by a straightening machine while the residual temperature is still maintained, paving, cooling and airing the materials in a flat manner after straightening, and forbidding stacking.

Compared with the traditional method, the high-purity niobium rod produced by the method has the advantages of good surface quality, no peeling and bluing phenomenon and high outturn rate.

Claims (1)

1. A forging method of a high-purity niobium rod is characterized by comprising the following steps: the forging method comprises the following steps:

step 1), polishing the outer circumferential surface of a niobium ingot, wherein the turning size allows steps to be arranged according to the surface quality, and the steps need to be obliquely wrapped and transited;

step 2), placing the niobium ingot on a radial forging machine according to the set middle size for forging, wherein the reduction is 20-30 mm, the pulling speed is less than or equal to 1.5m/min, pulling in a single pass, prohibiting reciprocating forging, starting a water pipe in the whole process for spraying and cooling, dynamically measuring the temperature in real time, wherein the process temperature and the final temperature are less than or equal to 330 ℃, and otherwise, stopping forging;

step 3), when the final forging temperature of the niobium ingot in the step 2) is less than or equal to 330 ℃, immediately stopping forging, lifting the blank away from forging equipment, cooling in water for 15-20 min, and leaping up and down in a reciprocating manner, wherein the water inlet depth is more than or equal to 0.5 m;

step 4), continuously forging and forming the water-cooled blank on a radial forging machine, wherein the reduction is 5-10 mm, the drawing speed is less than or equal to 1.2m/min, drawing in a single pass, prohibiting reciprocating forging, and opening a water pipe for spraying and cooling in the whole process;

and 5) after forging and forming, straightening by a straightening machine while the residual temperature is still maintained, paving, cooling and airing the materials in a flat manner after straightening, and forbidding stacking.