Unlock instant, AI-driven research and patent intelligence for your innovation.

Wire electric-arc additive manufacturing method for titanium alloy

A technology of additive manufacturing and titanium alloy, applied in the direction of manufacturing tools, additive processing, arc welding equipment, etc., can solve the problem of coarsening microstructure, increasing surface roughness of formed parts, reducing the strength and shaping of additive parts, etc. problems, achieve the effect of repairing defects such as pores and cracks, preventing microstructure coarsening, and improving mechanical properties

Active Publication Date: 2019-05-28
NORTHEASTERN UNIV
View PDF8 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Multiple thermal cycles in the additive process lead to higher thermal stress, which causes deformation of the formed part and the substrate, which brings more difficulties to the control of dimensional accuracy
In addition, due to factors such as serious heat accumulation and poor heat dissipation in the wire arc additive forming process, it is easy to cause collapse and "flowing" phenomena at the joints between layers, and the forming surface is prone to unevenness, which eventually leads to an increase in the surface roughness of the formed part.
[0006] (2) Forming structure and performance control issues (controllability)
[0007] ① During the arc additive manufacturing process, the formed parts tend to form coarse columnar grains and uneven chemical composition caused by segregation, which in turn leads to performance deterioration (grain boundary brittleness, intergranular corrosion, etc.)
[0008] ② Defects such as pores and thermal cracks are prone to occur during the arc additive manufacturing process, which reduces the density and corrosion resistance of the deposited metal, reduces the effective bearing area of ​​the additive parts, and easily causes stress concentration, thereby reducing the increase Strength and shape of material parts
However, when the additive body is modified by the method of friction stir processing, the action area of ​​the stirring pin is limited, and the metal on the side wall of the additive body is difficult to be processed, and the metal on the side wall still retains the characteristics of the casting structure; in addition, the front layer is stirred During the subsequent arc additive manufacturing or friction stir processing modification of the deposited metal modified by friction processing, the microstructure will be coarsened due to multiple thermal cycles, resulting in a decrease in the performance of the additive body

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Wire electric-arc additive manufacturing method for titanium alloy
  • Wire electric-arc additive manufacturing method for titanium alloy
  • Wire electric-arc additive manufacturing method for titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as Figure 1 ~ Figure 4 As shown, this embodiment provides The method of Ti-6Al-4V wire arc additive manufacturing straight wall wall includes the following steps:

[0038] Step 1. Use the cooling roller to assist in arc additive forming: use three-dimensional drawing software to draw a straight wall model with a size of 300mm (length) × 100mm (height) × 13mm (width), and use slice software to layer the part model Slicing process to obtain layered slice data, use simulation software to simulate the layered slice data and optimize the forming path, generate robot control code (or numerical control code), import the robot control code into the welding robot, and use the welding robot to use The arc generated by the TIG welder is the heat source, and the Ti-6Al-4V wire arc additive forming is performed on the T-shaped substrate 1 prepared in advance, and 2 to 4 layers are co-deposited to form a multilayer deposited metal 2 to form a multilayer The width of the deposite...

Embodiment 2

[0051] This example provides The method of Ti-6Al-4V wire arc additive manufacturing straight wall wall includes the following steps:

[0052] Step 1. Use the cooling roller to assist in arc additive forming: use three-dimensional drawing software to draw a straight wall model with a size of 300mm (length) × 100mm (height) × 42mm (width), and use slice software to layer the part model Slicing process to obtain layered slice data, use simulation software to simulate the layered slice data and optimize the forming path, generate robot control code (or CNC code), import the robot control code into the welding robot, and use the welding robot to use The arc generated by the TIG welder is the heat source, and the Ti-6Al-4V wire arc additive forming is performed on the T-shaped substrate 1 prepared in advance, and 2 to 4 layers are co-deposited to form the multi-layer deposition metal 2. The width of the deposited metal 2 is 42mm, and the multilayer deposited metal 2 is obtained by mu...

Embodiment 3

[0062] This example provides The method of Ti-6Al-4V wire arc additive manufacturing straight wall wall includes the following steps:

[0063] Step 1. Arc additive forming with the aid of cooling roll pressing: use three-dimensional drawing software to draw a straight wall model with a size of 300mm (length) × 100mm (height) × 25mm (width), and use slice software to layer the part model Slicing process to obtain layered slice data, use simulation software to simulate the layered slice data and optimize the forming path, generate robot control code (or numerical control code), import the robot control code into the welding robot, and use the welding robot to use The arc generated by the TIG welder is the heat source, and the Ti-6Al-4V wire arc additive forming is performed on the T-shaped substrate 1 prepared in advance, and 2 to 4 layers are co-deposited to form a multilayer deposited metal 2 to form a multilayer The width of the deposited metal 2 is 25mm, and the multilayer dep...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Widthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a wire electric-arc additive manufacturing method for a titanium alloy. The wire electric-arc additive manufacturing method comprises the following steps: step 1, performing electric-arc additive forming by utilizing cooling rolling assistance; step 2, performing milling processing on the side surfaces and a top surface of an additive body; step 3, performing friction stirprocessing on the additive body by utilizing friction stir processing equipment, and utilizing a cooling rolling device to perform cooling rolling on the side wall of the additive body in a friction stir processing process; step 4, performing fine milling on the upper surface of the additive body for next-step electric-arc additive forming; and step 5, repeatedly performing the steps in a circulating mode until accomplishing final forming of a part. The wire electric-arc additive manufacturing method can completely break dendritic growth in an titanium alloy additive forming process, can refine crystalline grains, and effectively repairs defects such as gas holes and cracks; and meanwhile, in a wire electric-arc additive manufacturing process and a modifying process thereof, cooling is applied to prevent the additive body from over-heating and microstructure coarsening caused by the over-heating, so that mechanical properties, especially plasticity and fatigue performance, of the additive body are greatly improved.

Description

Technical field [0001] The invention belongs to the technical field of metal additive manufacturing, and relates to a titanium alloy wire arc additive manufacturing method, in particular to a titanium alloy wire arc additive manufacturing method assisted by cooling roll pressing and friction stir processing. Background technique [0002] Wire and Arc Additive Manufacture (WAAM) of metal uses gas metal arc welding (GMAW), argon tungsten arc welding (GTAW) or plasma arc welding (PAW) as the heat source, using discrete, The accumulation principle, through the addition of metal wires, under the control of the program, according to the three-dimensional digital model, the advanced manufacturing technology of three-dimensional metal parts layer by layer from line-surface-body. Compared with the additive manufacturing technology using laser and electron beam as heat sources, it has the following advantages: 1) High deposition rate and high wire utilization, low manufacturing cost; 2) Ma...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B23P15/00
CPCB23P15/00B23K9/042B23K2103/14B23K20/122B23K20/233B33Y10/00B33Y30/00B33Y50/00B33Y70/00B33Y40/20B23K20/1255
Inventor 何长树韦景勋李颖田妮秦高梧
Owner NORTHEASTERN UNIV