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Method for milling surfaces of pure-titanium blanks smelted by EB furnace

A rough, pure titanium technology, applied in the direction of milling machine equipment, milling machine equipment details, metal processing equipment, etc., can solve the problem that micro-cracks are easily formed at the edge of titanium curling, surface tip effects are easy to form, and too deep milling cutter lines cannot be left, etc. problems, to reduce the surface tip effect, improve processing plasticity, and reduce the effect of air absorption

Active Publication Date: 2018-03-09
YUNNAN TITANIUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of hot rolling and processing the pure titanium blank produced by electron beam cooling bed furnace into titanium coil, it is plastic processing of longitudinal elongation. At this time, the elongation direction is just in line with the growth direction of the columnar crystal system on the surface of the ingot. Vertical, in the process of processing, it is easy to appear intergranular cracks
In other words, microcracks are easily formed in the titanium bead
For this reason, the columnar crystal system should be removed as much as possible during face milling, but at the same time, too deep milling cutter lines should not be left during face milling, especially the direction of the milling cutter marks and the intergranular direction of the columnar crystal system cannot be separated. Parallel, milling cutter lines should be as dense and regular as possible, otherwise it is easy to form a surface tip effect during the heating process of the billet, which will aggravate the risk of intergranular cracks
[0003] Through the retrieval of prior art documents, no related reports have been found about the method of milling face of pure titanium blank in EB furnace

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Step 1. After the pure titanium blank is smelted in the EB furnace, it is air-cooled to 100~150°C, and the end face width (1250mm) of the blank is measured. The ingot with a specification of 1250×210×8200mm (width×thickness×length) is used as an example below;

[0017] Step 2. Select the face milling cutter head. The selection rules are: , then D 刀盘直径 The range should be 277~416mm, and the cutterhead with a diameter of 350mm is used as the cutterhead in this embodiment below.

[0018] Step 3. According to the columnar crystal system of the EB furnace smelting blank and the empirical formula for milling surface removal, the depth of the milling surface should be 5.25~6mm, and the depth of the milling surface is 5.5mm, and then according to the formula, it can be obtained: the upper milling depth H 上 =2.75mm, down milling depth H 下 =1.65mm, left milling depth H 左 =0.55mm, right milling depth H 右 =0.55mm. During the upper milling, the feeding speed of the upper milli...

Embodiment 2

[0020] Step 1. After the pure titanium blank is smelted in the EB furnace, it is air-cooled to 100~150°C, and the end face width of the blank is measured (1050mm). The following is an ingot with a specification of 1050×210×8200mm (width×thickness×length) as an example;

[0021] Step 2. Select the face milling cutter head. The selection rules are: , then D 刀盘直径 The range should be 233 ~ 350mm, and the cutterhead with a diameter of 260mm is used as the cutterhead used in this embodiment below.

[0022] Step 3. According to the columnar crystal system of the blank smelted in the EB furnace and the empirical formula for milling surface removal, the depth of the milling surface should be 5.25~6.0mm, and the depth of the milling surface is 6.0mm, and then according to the formula, it can be obtained: the upper milling depth h 上 =3.3mm, down milling depth H 下 =2.0mm, left milling depth H 左 =1.2mm, right milling depth H 右 =1.2mm. During the upper milling, the feeding speed of t...

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Abstract

The invention discloses a method for milling surfaces of pure-titanium blanks smelted by EB furnace. The method includes the steps: taking out pure-titanium blanks smelted by the EB furnace, performing air cooling on smelted pure-titanium blanks, and measuring end surface widths of the blanks; selecting milled surface cutters according to the end surface widths of the pure-titanium blanks smeltedby the EB furnace; confirming final depths of the milled surfaces, and milling surfaces of the pure-titanium blanks according to rules of upper milling, lower milling, left milling and right milling of the same end surface. The surface milling method can effectively decrease surface tip effects of the titanium blanks milled the surfaces in the heating process of a follow-up hot rolling process, air suction is reduced, relative hardening between heating surface and a substrate is relieved, surface machining plasticity of the titanium blanks is greatly improved, and the quality of a hot rollingreel is greatly improved.

Description

technical field [0001] The invention relates to a method for smelting pure titanium rough blanks in an EB furnace and belongs to the technical field of pure titanium machining. Background technique [0002] Electron beam cold bed melting technology (EBCHMR) can better solve the problems of high-density inclusions (HDI) and low-density inclusions (LDI) in the traditional vacuum consumable electric arc furnace (VAR) melting titanium and titanium alloys, and It is widely used in the smelting production of high-clean titanium and titanium alloys, especially the production of large-scale high-purity pure titanium blanks. However, due to its casting method and the strong water cooling effect of the crystallizer, it is easy to form a columnar crystal system in the contact area between the titanium liquid and the inner wall of the crystallizer, that is, the surface of the subsequent ingot, and in the middle of the ingot, it is easy to form an equiaxed crystal system. . Due to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23C3/00
CPCB23C3/00
Inventor 黄海广曹占元李志敏史亚鸣黄晓慧
Owner YUNNAN TITANIUM IND