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Build-up welding repair process of disc shear blade and repaired disc shear blade thereby

A technology of scissor blades and disc shears, which is applied in the direction of knives, shearing devices, and shearing equipment used in shearing machines, and can solve the problems of high hardness and strength requirements, high cost, and high production costs. Achieve the effects of easy popularization and application, lower production costs, and simple repair process

Inactive Publication Date: 2008-07-09
桂林航天工业高等专科学校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Disc scissors are the main tool for cutting steel plates. Because of their high requirements on hardness and strength, they are often made of alloy steel and require complex heat treatment, which results in high cost.
At present, after the outer edge of the disc scissors is worn out, it has to be scrapped and disposed of, which consumes a lot, resulting in high production costs.

Method used

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  • Build-up welding repair process of disc shear blade and repaired disc shear blade thereby
  • Build-up welding repair process of disc shear blade and repaired disc shear blade thereby

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The original standard diameter D is 362mm, the thickness H is 30mm disc scissors.

[0022] ① Mechanical processing to remove the worn outer edge, such as turning or wire cutting to remove the worn outer edge, so that the original diameter of 362mm disc scissors is processed into a diameter D 1 350mm disc scissor blade substrate;

[0023] ②The old disc scissors are pickled to remove surface rust;

[0024] ③Using carbon structural steel Q235-A to make the repair parts, the repair parts have an outer diameter of D 2 374mm, the inner diameter is 350mm, the thickness H is 30mm, and the inner edge has outer diameter D on both sides. 3 An annular groove of 365 mm and a depth h of 4 mm;

[0025] ④The repair part 2 is assembled with the disc scissor blade substrate 1; as shown in Figure 1;

[0026] ⑤ The metal surfacing electrode is preheated at 320°C for 1 hour, and the electrode used is the D327 metal surfacing electrode of Ф3.2;

[0027] ⑥Preheat the assembled disc sciss...

Embodiment 2

[0036] The original standard diameter D is 1300mm, the thickness H is 70mm disc scissors.

[0037] ①Machining to remove the worn outer edge, so that the disc scissors with the original diameter of D = 1300mm are processed into a diameter of D 1 = 1220mm disc scissors blade substrate;

[0038] ② The old disc scissors are pickled to remove surface rust and reduce welding impurities;

[0039] ③ Use No. 45 steel to make repair parts, and its outer diameter is D 2 =1330mm, inner diameter is D 1 =1220mm, thickness=70mm, both sides of the inner edge have outer diameter D 3 = 1306mm, depth h = 20mm annular groove;

[0040] ④The repair part 2 is assembled with the disc scissor blade substrate 1; as shown in Figure 1;

[0041] ⑤ The metal surfacing electrode is preheated at 400°C for 1.5 hours, and the D337 metal surfacing electrode with Ф5.0 is used;

[0042]⑥Preheat the assembled disc scissors at 400°C for 1 hour;

[0043] ⑦Use the preheated welding rod to weld the preheated as...

Embodiment 3

[0049] The original standard diameter D is 820mm, the thickness H is 50mm disc scissors.

[0050] ①Machining to remove the worn outer edge, so that the disc scissors with the original diameter of D=820mm are processed into a diameter of D 1 = 780mm disk scissors blade substrate;

[0051] ② The old disc scissors are pickled to remove surface rust and reduce welding impurities;

[0052] ③Using No. 25 steel to make repair parts, its outer diameter is D 2 =844mm, inner diameter is D 1 =780mm, thickness H=50mm, both sides of the inner edge have outer diameter D 3 =826mm, the annular groove of depth h=14mm;

[0053] ④The repair part 2 is assembled with the disc scissor blade substrate 1; as shown in Figure 1;

[0054] ⑤ The metal surfacing electrode is preheated at 380°C for 1.2 hours, and a self-made metal surfacing electrode with Ф4.0 is used. The components and ratios of W, Mo, V, Cr and other components contained in this electrode are consistent with the standard brand D337...

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Abstract

The invention relates to a method for repairing the disc shear blade via built-up welding, comprising following steps: (1) removing abraded edge to process it into disc shear blade base plate with D1 diameter; (2) acid cleaning derusting; (3) using carbon steel to prepare disc repair element whose outer diameter is D2, inner diameter is D1 and the thickness is same with base plate while the D2-D is 12-30 mm and the two surface of inner edge has annular grooves; (4) integrating the repair element and base plate; (5) preheating the welding bar and using the metal comprising W, Mo, V, and Cr to built-up weld welding bar; (6) preheating the integrated disc shear blade; (7) processing several built-up welding to repair the grooves of inner edge; (8) keeping disc shear blade in 450-550Deg. C for 0.8-1.2 hours; being cooled to 10-30Deg. C; keeping it in 480-560Deg. C for 0.8-1.2 hours to be tempered; (9) processing mechanical machining to attain repaired disc shear blade with smooth surface and D outer diameter, while it has better rigidity and abrasion resistance. The inventive shear blade has same machining ability with new blade, while it utilizes waste blade to reduce the producing cost.

Description

(1) Technical field [0001] The invention relates to a repair process of disc scissors, in particular to a repair process of surfacing welding for disc scissors. (2) Background technology [0002] Disc scissors are the main tool for cutting steel plates. Because of their high requirements on hardness and strength, they are often made of alloy steel and undergo complicated heat treatment, resulting in high cost. At present, after the outer edge of the disc scissors is worn out, it has to be scrapped and discarded, which consumes a lot and causes the production cost to remain high. (3) Contents of the invention [0003] The purpose of the present invention is to design a kind of disc scissors blade surfacing welding repair process, which can repair the disc scissors blade substrate with collapsed or worn out edges into a disc scissors blade with a standard diameter that meets the cutting hardness requirements. Disc scissors blade substrates are reused to reduce production co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P6/00B23K9/04B23K9/095B23D35/00B23D19/00
Inventor 刘晓刚覃学东王斌武
Owner 桂林航天工业高等专科学校
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