JPH0238917Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Field of Application] The present invention relates to a continuous bright annealing apparatus for titanium tubes. [Prior Art] The present applicant has previously developed a bright annealing apparatus for titanium tubes as shown in FIG. That is, the device includes a cylindrical body 2 having an inner diameter that allows passage of the titanium tube 1.
a heating device 3 arranged on the outer peripheral wall of the cylinder, and an inert gas supply pipe 4 provided on the cylinder wall surface to the inner surface of the cylinder.
a seal 5 made of an elastic material such as rubber and having an opening hole that allows passage of the titanium tube 1 provided at the inlet end of the cylinder; a cooling water injection device 6 disposed at the exit end of the cylinder; and a cooling water injection device 6 disposed at the exit end of the cylinder A water curtain device 7 is provided at the rear of the device 6. Using such a device, the titanium tube 1 is fed into the cylindrical body 2, and heated to a temperature of 500°C or higher using the heating device 3.
Heating to about 600°C, and then cooling the heated titanium tube 1 by injecting cooling water with a cooling water injection device 6 at the outlet end of the tube while blowing an inert gas from the feed pipe 4. Bright annealing is performed using a method of bright annealing. [Problems to be Solved by the Invention] However, it has been found that in such continuous bright annealing of titanium tubes, the surface of the titanium tubes sometimes becomes discolored due to oxidation during water cooling. After investigating the cause, it was found that it was closely related to the temperature of the titanium tube surface. That is, the table below shows typical experimental data regarding the temperature of the titanium tube at the cooling water injection position and the state of discoloration on the outer surface of the tube after cooling. The pipe material used in this experiment was ASTMB338Grad2, the dimensions were 22.22φ x 0.7t, argon gas was used as the inert gas, and tap water was used as the cooling water.

[Table] As is clear from the table above, it was found that there was a change in the outer surface of the titanium tube when the temperature of the titanium tube reached 500°C during cooling water injection. [Means for solving the problems] The present invention aims to solve the above problems.
It is. In other words, this invention lowers the temperature of the titanium tube to 500
A water cooling jacket is installed around the cylinder to keep the temperature below ℃. [Example] An example will be described based on the drawings. FIG. 1 is a sectional view of a device showing an example of the implementation of the present invention, and parts with the same names as those in FIG. 2 are designated by the same symbols.
This device is provided with a jacket 8 that extends the distance between the heating device 3 and the cooling water injection device 6 and circulates the cooling water around the outer periphery of the cylindrical body 2. Then, the titanium tube 1 is introduced into the cylinder body 2, heated to about 600°C by the heating device 3, and then the cooling water is circulated while blowing argon gas from the inert gas supply pipe 4. Approximately 400℃ at jacket 8
Then, the cooling water injection device 6 injects cooling water to cool it to about 200°C. in this case,
If the cylindrical body 2 is made of black carbon, the cooling effect will be even better. [Effect of the invention] The material annealed by the apparatus of the invention had a silvery-white bright surface, which did not change at all even after continuous annealing. Therefore, the apparatus of the present invention has made it possible to perform continuous bright annealing of titanium tubes, which was previously considered difficult.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of a prior example. DESCRIPTION OF SYMBOLS 1... Titanium tube, 2... Cylindrical body, 3... Heating device, 4... Inert gas supply pipe, 5... Seal, 6... Cooling water injection device, 7... Water curtain device, 8... ...jacket.

Claims (1)

[Scope of utility model registration request] A cylindrical body with an inner diameter that allows the titanium tube to pass through, a heating device installed on the outer peripheral wall of the cylindrical body, and an inert gas supplied into the tube in order to spray the inert gas onto the outer surface of the titanium tube. A seal having an opening hole provided at the inlet end of the cylinder to allow passage of the titanium tube, a water cooling jacket disposed around the cylinder to cool the titanium tube, and a water cooling jacket disposed at the outlet of the cylinder. A bright annealing apparatus for titanium tubes, comprising a cooling water injection device and a water curtain device disposed behind the cooling water injection device.