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

Vigorous plastic forming method for conical thin-wall component

A technology of thin-walled components and severe plasticity, applied in the direction of forming tools, furnace types, furnaces, etc., can solve the problems of low fit between the inner cone and the mandrel, difficult processing of tapered thin-walled parts, and difficult manufacturing. Achieve the effect of ensuring the stability of geometric dimensions, easy realization of industrial production, and overcoming uneven organization

Pending Publication Date: 2022-03-08
NO 59 RES INST OF CHINA ORDNANCE IND
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its poor rigidity, weak strength, and complicated structural stress forms, it is difficult to conduct force analysis according to classical theories. During the manufacturing process, problems such as deformation, instability, and vibration are prone to occur, making it extremely difficult to manufacture. It is a recognized complex manufacturing process.
However, the conical deformation area and deformation characteristics are different from those of cylindrical parts. The degree of deformation is large, which is easy to cause thinning and cracking, and is also prone to wrinkling. Therefore, the processing of conical thin-walled parts is even more difficult.
[0003] The existing plastic forming processes of conical thin-walled components are mainly stamping, spinning, and warm extrusion. The stamping method is a partial forming, and the anisotropy of the plate is serious, and mixed crystal structures often exist in the weak deformation area or severe deformation area; The pressing method has asymmetrical texture and uneven organization, the inner cone and the mandrel are not well bonded, the roundness reaches 0.05mm, and the spinning trace is 0.02-0.08mm; the warm extrusion is combined with the cutting method, and the internal grains change with the temperature. The surface is oxidized seriously and needs to be cut. The inner surface has about 0.10mm machining tool marks, the dimensional accuracy is low, and the coaxiality of the inner and outer taper surfaces is about 0.05mm.
Therefore, the existing processing technology of conical thin-walled components generally has many internal defects in large-sized blanks, poor grain size, poor structure uniformity, inconsistent stress values ​​at different parts, low surface quality, low dimensional accuracy, poor dimensional stability, and processing knives. marks

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
  • Vigorous plastic forming method for conical thin-wall component
  • Vigorous plastic forming method for conical thin-wall component
  • Vigorous plastic forming method for conical thin-wall component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for severe plastic forming of a tapered thin-walled member, comprising the following steps:

[0030] (1) Material preparation: a single cone member with a diameter of 80 mm and a variable wall thickness structure with a maximum wall thickness of 1.76 mm; a Ta bar with a diameter of 16 mm is selected.

[0031] (2) Continuous extrusion and large plastic deformation: degrease and decontaminate the surface of the rod obtained in step (1), and perform severe large plastic deformation on the extrusion equipment, the heating temperature of the rod is 135°C, and the extrusion speed is 15mm / s , to prepare a plate with a thickness of 2mm and a width of 100mm; nitrogen protection is used during the heating and extrusion process of the bar, and the exit of the extrusion is cooled by a 40°C water seal; the surface roughness is 0.4-0.8μm ( figure 1 ), the average grain size of the plate is 1-3 μm ( figure 2 ).

[0032] (3) Multi-pass stamping forming: the sheet material o...

Embodiment 2

[0039] A method for severe plastic forming of a tapered thin-walled member, comprising the following steps:

[0040](1) Material preparation: A single-cone member with a diameter of 140mm and a variable wall thickness structure with a maximum wall thickness of 2.45mm uses TaW2.5 rods with a diameter of 20mm.

[0041] (2) Continuous extrusion and large plastic deformation: degrease and decontaminate the surface of the rod obtained in step (1), carry out severe large plastic deformation on the extrusion equipment, the heating temperature of the copper rod is 200 ° C, and the extrusion speed is 20mm / s, a plate with a thickness of 4.5mm and a width of 150mm was prepared; nitrogen protection was used during the heating and extrusion process of the bar, and the exit of the extrusion was cooled by a water seal at 40°C; the surface roughness was 0.4-0.8μm ( figure 1 ), the average grain size of the plate is 2.8~5μm ( figure 2 ).

[0042] (3) Multi-pass stamping forming: the sheet ...

Embodiment 3

[0049] A method for severe plastic forming of a tapered thin-walled member, comprising the following steps:

[0050] (1) Material preparation: A double-cone member with a diameter of 110mm and a variable wall thickness structure with a maximum wall thickness of 4.52mm uses a TU1 rod with a diameter of 30mm.

[0051] (2) Continuous extrusion and large plastic deformation: degreasing and decontaminating the surface of the rod obtained in step (1), and carrying out severe large plastic deformation on the extrusion equipment, the heating temperature of the copper rod is 180°C, and the extrusion speed is 20mm / s, a plate with a thickness of 6mm and a width of 135mm was prepared; nitrogen protection was used during the heating and extrusion process of the bar, and the exit of the extrusion was cooled by a water seal at 40°C; the surface roughness was 0.4-0.8μm ( figure 1 ), the average grain size of the plate is 3~3μm ( figure 2 ).

[0052] (3) Multi-pass stamping forming: the sh...

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
Caliberaaaaaaaaaa
Lengthaaaaaaaaaa
Average grain sizeaaaaaaaaaa
Login to View More

Abstract

The invention provides a violent plastic forming method for a conical thin-wall component, which comprises the steps of continuous extrusion rolling severe plastic deformation, multi-pass stamping forming and low-temperature stress relief heat treatment, the heating temperature of a blank in the continuous extrusion rolling severe plastic deformation is 100-220 DEG C, and the multi-pass stamping forming is performed under the action of three-way pressure stress; the temperature of the low-temperature destressing heat treatment is 150-260 DEG C. According to the preparation method, the technical problems that the structure obtained through a conventional preparation method is not uniform, the size precision is not high, and the internal quality is poor are solved, the prepared thin-wall component is refined in structure, accurate in size, bright in surface and stable in performance, and the penetration power and stability of the energy-gathered warhead are improved. And meanwhile, the method has the advantages of high production efficiency, good process stability, easiness in industrial production and the like.

Description

technical field [0001] The invention belongs to the technical field of metal plastic forming, in particular to a severe plastic forming method of a conical thin-walled member. Background technique [0002] Thin-walled parts have the characteristics of light weight and compact structure, and are widely used in aerospace, automobiles, drug-type covers and other fields. However, due to its poor rigidity, weak strength, and complicated structural stress forms, it is difficult to conduct force analysis according to classical theories. During the manufacturing process, problems such as deformation, instability, and vibration are prone to occur, making it extremely difficult to manufacture. It is a recognized complex manufacturing process. . However, the conical deformation area and deformation characteristics are different from those of cylindrical parts. The degree of deformation is large, which is easy to cause thinning and cracking, and is also prone to wrinkling. Therefore, t...

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): B23P15/00B21B1/18B21B37/74B21D22/02B21D37/18C21D9/00C22F1/02C22F1/18
CPCB23P15/00B21B1/18B21B37/74B21D22/02B21D37/18C22F1/02C22F1/18C21D9/0068
Inventor 吴洋宋阳曦舒大禹苏柳詹红屈俊岑赵祖德王长朋陈文
Owner NO 59 RES INST OF CHINA ORDNANCE IND