阅读说明：本技术 一种增材制造用钛及钛合金棒丝材制备工艺方法 (titanium and titanium alloy rod wire preparation process method for additive manufacturing ) 是由 李渤渤 裴腾 刘茵琪 王树军 蒋林凡 张强 于 2019-10-31 设计创作，主要内容包括：一种增材制造用钛及钛合金棒丝材制备工艺方法,具体步骤如下：将熔炼所需原料,海绵钛、中间合金称重,加入混料机中均匀混料,将得到的EB熔炼用棒料进行铸锭得EB铸锭毛坯；将获得的EB铸锭毛坯表面进行机加工,铣面去除厚度2~5mm,对表面缺陷进行修磨和抛光处理；经过一火次或多火次以及金属压力加工处理获得棒材与丝材,不同火次之间进行矫直机在线矫直和无心车床扒皮和抛光。本发明制备工艺简单、成本低,获得的棒丝材O、N等杂质元素含量低,成分更为纯净,有效提高增材制造零部件综合性能。(titanium and titanium alloy rod wire materials for additive manufacturing are prepared by weighing raw materials required by smelting, sponge titanium and intermediate alloy, adding the weighed raw materials into a mixer for uniform mixing, casting an EB (electron beam) smelting rod material to obtain an EB ingot blank, machining the surface of the obtained EB ingot blank, milling the surface to remove the thickness of 2-5 mm, grinding and polishing surface defects, processing through times or multiple times of fire and metal pressure to obtain a rod material and a wire material, and performing online straightening by a straightener and peeling and polishing by a centerless lathe among different times of fire.)

1, kinds of titanium and titanium alloy bar wire material preparation method for additive manufacturing, which is characterized in that, the concrete steps are as follows:

step , weighing raw materials required for smelting, sponge titanium and intermediate alloy, adding the raw materials into a mixer, and uniformly mixing the raw materials to prepare a bar material for EB smelting;

drying the EB smelting bar, then placing the dried EB smelting bar into a material box, placing the material box into a feeding chamber, vacuumizing the smelting chamber and the feeding chamber, then starting an electron gun to perform skull preheating, and continuously feeding and smelting the EB smelting bar to obtain times of EB smelting ingot blank;

machining the surface of the EB ingot casting blank obtained in the step two, removing the thickness of 2-5 mm, polishing and polishing the surface defects by using a grinding wheel and a flap wheel, and preparing a square or cylindrical hot rolling blank with the required dimension and specification by hot rolling in the post-process by adopting a machining method;

and step four, fire times or multiple fire times and metal pressure processing are carried out to obtain the rod wire with the required specification, and online straightening by a straightening machine and peeling and polishing by a centerless lathe are carried out among different fire times.

2. The process for preparing kinds of titanium and titanium alloy rods and wires for additive manufacturing according to claim 1, wherein the drying temperature in step two is 100-200 deg.C, and the temperature is maintained for 0.5-2 h.

3. The process of kinds of additive manufacturing titanium and titanium alloy rods and wires as claimed in claim 1, wherein in step two, the vacuum degree of the melting chamber is not more than 0.07Pa, and the vacuum degree of the feeding chamber is not more than 0.3 Pa.

4. The process of kinds of additive manufacturing titanium and titanium alloy rods and wires as claimed in claim 1, wherein the smelting in step two is cold hearth smelting.

5. The process of kinds of additive manufacturing titanium and titanium alloy rods and wires as claimed in claim 1, wherein the size of the slab ingot blank in step two is 200 x 1090-1290 x 6100-6200 mm.

Technical Field

The invention belongs to the technical field of material processing, and particularly relates to a preparation process method of titanium and titanium alloy rod wires for additive manufacturing.

Background

The 3D printing additive manufacturing is advanced, efficient and near-net-shape part production modes, is high in material utilization rate, can produce thin walls, complex cavities and lattice structures which cannot be prepared by the traditional process, meets personalized requirements, and has a development prospect of . the titanium alloy is the most common metal material in 3D printing, has the characteristics of low density, high specific strength, excellent corrosion resistance, good biocompatibility and the like, has a wide application prospect of in the fields of aerospace, ships, chemical industry, biomedical treatment, transportation, sports leisure, daily necessities and the like, but has low material utilization rate and high processing cost due to the reasons of high titanium activity, high strength, difficult deformation and the like when the titanium alloy is traditionally manufactured and processed, the titanium alloy is in the whole process cost from raw materials to parts, the titanium material processing and final part processing cost accounts for more than 70%, the material utilization rate is less than 30%, and the cost reduction has become an important subject which China and even the world titanium science and technology must face with industry, and the 3D printing technology adopts the additive manufacturing processing method, so that the problems are effectively avoided, and compared with the great advantages of the traditional processing method.

In order to improve the comprehensive performance of the additive manufacturing parts, the lower the impurity elements such as titanium and titanium alloy rod wire O, N and the like, the better the additive manufacturing parts are, at present, the process flow of the preparation of the additive manufacturing titanium and titanium alloy rod wire is a route from VAR smelting-forging-rolling, and the preparation process is from material mixing, electrode pressing and assembly welding, 2-3 times of VAR smelting, forging, peeling and grinding to rod rolling.

Disclosure of Invention

The technical scheme of the invention is that a preparation process method of titanium and titanium alloy rod wires for additive manufacturing comprises the following steps:

step , weighing raw materials required for smelting, sponge titanium and intermediate alloy, adding the raw materials into a mixer, and uniformly mixing the raw materials to prepare a bar material for EB smelting;

drying the EB smelting bar, then placing the dried EB smelting bar into a material box, placing the material box into a feeding chamber, vacuumizing the smelting chamber and the feeding chamber, then starting an electron gun to perform skull preheating, and continuously feeding and smelting the EB smelting bar to obtain times of EB smelting ingot blank;

machining the surface of the EB ingot casting blank obtained in the step two, removing the thickness of 2-5 mm, polishing and polishing the surface defects by using a grinding wheel and a flap wheel, and preparing a square or cylindrical hot rolling blank with the required dimension and specification by hot rolling in the post-process by adopting a machining method;

and step four, fire times or multiple fire times and metal pressure processing are carried out to obtain the rod wire with the required specification, and online straightening by a straightening machine and peeling and polishing by a centerless lathe are carried out among different fire times.

, optimizing, wherein the drying process conditions in the second step are that the drying temperature is 100 ℃ and 200 ℃, and the heat preservation time is 0.5-2 h.

And , optimizing, wherein in the second step, the vacuum degree of the smelting chamber is not more than 0.07Pa, and the vacuum degree of the feeding chamber is not more than 0.3 Pa.

, optimizing, wherein the smelting in the step two adopts cold hearth smelting.

And , optimizing, wherein the size of the slab ingot blank in the second step is 200 multiplied by 1090-1290 multiplied by 6100-6200 mm.

The invention has the beneficial effects that:

, in order to obtain stable ionization arc by traditional VAR smelting, fixed content of gas content is required to be used as ionization medium, the smelting vacuum degree is in the range of 0.1-5 Pa, high vacuum degree smelting cannot be realized, and smelting is carried out for 2-3 times, so that O, N harmful impurity element increment is large, and the smelting chamber of the method reaches 10^-1~10^-3Pa high vacuum degree range, small O, N harmful impurity element increment, and improved quality of additive manufacturing raw materialHorizontal;

secondly, the high-energy-density electron beams are used for generating high temperature to melt the metal when bombarding the metal, so that the processes of smelting, purifying, impurity removal and the like of the metal material are realized, the superheat degree of the smelting reaches more than 400 ℃, the time for the material to be in a liquid state is long, the vacuum degree is high, and sufficient refining area and time are provided, so that low-density impurities are dissolved and volatilized, high-density impurities sink and are captured by a skull, and in view of the advantages, compared with the traditional VAR smelting, the method can effectively remove the high-density impurities and the low-density impurities, has refining and purifying effects on impurity elements such as Cl, Mg, Sn, Mn and the like, and improves the comprehensive performance of material-increasing manufacturing;

the production of the traditional blank for the bar and wire materials mainly comprises the steps of mixing titanium sponge or titanium residues, performing electrode pressing and assembly welding on the titanium sponge or the titanium residues, performing VAR smelting for 2-3 times, and performing pulling forging for multiple times to obtain a rectangular or cylindrical blank;

and fourthly, because the production procedures are reduced, the yield is improved, and compared with the rod and wire material produced by the traditional process, the processing cost is reduced by more than 20 percent.

Detailed Description

The technical solutions in the embodiments of the present invention will be described in detail below, and it should be understood that the described embodiments are only some embodiments of , but not all embodiments.