CN103882209A - Process for manufacturing high-wear-resistant rotary shaft of rotary arm of large type excavator - Google Patents
Process for manufacturing high-wear-resistant rotary shaft of rotary arm of large type excavator Download PDFInfo
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- CN103882209A CN103882209A CN201410062610.4A CN201410062610A CN103882209A CN 103882209 A CN103882209 A CN 103882209A CN 201410062610 A CN201410062610 A CN 201410062610A CN 103882209 A CN103882209 A CN 103882209A
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- insulation
- rotation axis
- temperature
- bearing pin
- welding
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Abstract
The invention relates to a process for manufacturing a high-wear-resistant rotary shaft of a rotary arm of a large type excavator. The process disclosed by the invention comprises the following steps of: (1) carrying out intermediate-frequency treatment of a pin shaft; (2) putting the pin shaft subjected to intermediate-frequency treatment in a heat insulated box, wherein the top of the pin shaft is just exposed out of the heat insulated box and the temperature in the heat insulated box is 200-300 DEG C; (3) welding a lug plate on the top head face of the pin shaft to form the rotary shaft; (4), after welding, continuously putting the rotary shaft in the heat insulated box for 8-10 h, and keeping the temperature in the heat insulated box at 200-300 DEG C; and (5) after putting for 8-10 h, slowly decreasing the temperature and cooling the heat insulated box, and taking out the rotary shaft after decreasing the temperature to room temperature. By means of the specific process, the HAZ (Heat Affected Zone) is controlled within 10 mm; the welding intensity of the lug plate is ensured; and the crack problem is solved.
Description
Technical field
The invention belongs to the manufacturing process field of mechanical rotation axle, be specifically related to a kind of manufacturing process of large excavator pivot arm high abrasion rotation axis.
Background technology
In large excavator, the rotation axis of pivot arm is as an important stressed member, by ear pull, bearing pin forms, be prone to and damage the higher present situation of failure rate, and the problem of otic placode and bearing pin weld welding seam breaking.At present, bearing pin adopts 4340 steel conventionally, and 4340 material welding is a world-class difficult problem, particularly in the time that product uses in special force part, because the potential risk that welding crack brings is very large; Therefore be necessary to reduce and eliminate above-mentioned fault, guarantee the efficient normal operation of excavator.
Summary of the invention
The manufacturing process that the object of the present invention is to provide a kind of large excavator pivot arm high abrasion rotation axis, the hardness of product is high, flawless, long service life.
Technical scheme of the present invention is: a kind of manufacturing process of large excavator pivot arm high abrasion rotation axis, comprises the following steps: (1) bearing pin carries out intermediate frequency process; (2) by the bearing pin placement after intermediate frequency process and insulation can, insulation can is just exposed on bearing pin top, and the temperature in insulation can is 200-300 ℃; (3) ear is pulled to the top end face that is welded on bearing pin, formed after rotation axis (4) welding, rotation axis continues to be placed on 8-10 hour in insulation can, and the temperature in insulation can is 200-300 ℃; (5) place after 8-10 hour, the temperature slow cooling in insulation can is cooling, is down to after room temperature, takes out rotation axis.
Further, a kind of manufacturing process of large excavator pivot arm high abrasion rotation axis, comprises the following steps: (1) bearing pin carries out intermediate frequency process, surface hardness 55-60Rc; (2) by the bearing pin placement after intermediate frequency process and insulation can, insulation can is just exposed on bearing pin top, and the temperature in insulation can is 250-280 ℃; (3) ear is pulled to the top end face that is welded on bearing pin, formed after rotation axis (4) welding, rotation axis continues to be placed on 8.5-9.5 hour in insulation can, and the temperature in insulation can is 250-280 ℃; (5) place after 8.5-9.5 hour, the temperature slow cooling in insulation can is cooling, is down to after room temperature, takes out rotation axis.
As preferably, a kind of manufacturing process of large excavator pivot arm high abrasion rotation axis, comprises the following steps: (1) bearing pin carries out intermediate frequency process, surface hardness 55-60Rc; (2) by the bearing pin placement after intermediate frequency process and insulation can, insulation can is just exposed on bearing pin top, and the temperature in insulation can is 260 ℃; (3) ear is pulled to the top end face that is welded on bearing pin, formed after rotation axis (4) welding, rotation axis continues to be placed on insulation can interior 9 hours, and the temperature in insulation can is 280 ℃; (5) place after 9 hours, the temperature slow cooling in insulation can is cooling, is down to after room temperature, takes out rotation axis.
The manufacturing process of a kind of large excavator pivot arm high abrasion rotation axis provided by the invention, by special technique, controls HAZ in 10mm; Guarantee the welding strength of otic placode, solve crack problem.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1
A manufacturing process for large excavator pivot arm high abrasion rotation axis, comprises the following steps: (1) bearing pin carries out intermediate frequency process; (2) by the bearing pin placement after intermediate frequency process and insulation can, insulation can is just exposed on bearing pin top, and the temperature in insulation can is 200-300 ℃; (3) ear is pulled to the top end face that is welded on bearing pin, formed after rotation axis (4) welding, rotation axis continues to be placed on 8-10 hour in insulation can, and the temperature in insulation can is 200-300 ℃; (5) place after 8-10 hour, the temperature slow cooling in insulation can is cooling, is down to after room temperature, takes out rotation axis.
Embodiment 2
A manufacturing process for large excavator pivot arm high abrasion rotation axis, comprises the following steps: (1) bearing pin carries out intermediate frequency process, surface hardness 55-60Rc; (2) by the bearing pin placement after intermediate frequency process and insulation can, insulation can is just exposed on bearing pin top, and the temperature in insulation can is 250-280 ℃; (3) ear is pulled to the top end face that is welded on bearing pin, formed after rotation axis (4) welding, rotation axis continues to be placed on 8.5-9.5 hour in insulation can, and the temperature in insulation can is 250-280 ℃; (5) place after 8.5-9.5 hour, the temperature slow cooling in insulation can is cooling, is down to after room temperature, takes out rotation axis.
Embodiment 3
A manufacturing process for large excavator pivot arm high abrasion rotation axis, comprises the following steps: (1) bearing pin carries out intermediate frequency process, surface hardness 55-60Rc; (2) by the bearing pin placement after intermediate frequency process and insulation can, insulation can is just exposed on bearing pin top, and the temperature in insulation can is 260 ℃; (3) ear is pulled to the top end face that is welded on bearing pin, formed after rotation axis (4) welding, rotation axis continues to be placed on insulation can interior 9 hours, and the temperature in insulation can is 280 ℃; (5) place after 9 hours, the temperature slow cooling in insulation can is cooling, is down to after room temperature, takes out rotation axis.
After testing, the rotation axis of producing through technique of the present invention, surface hardness 55-60Rc; Earrings welding, intensity >800Mpa; More than reaching 50000h the work-ing life of product.
Claims (3)
1. a manufacturing process for large excavator pivot arm high abrasion rotation axis, comprises the following steps: (1) bearing pin carries out intermediate frequency process; (2) by the bearing pin placement after intermediate frequency process and insulation can, insulation can is just exposed on bearing pin top, and the temperature in insulation can is 200-300 ℃; (3) ear is pulled to the top end face that is welded on bearing pin, formed after rotation axis (4) welding, rotation axis continues to be placed on 8-10 hour in insulation can, and the temperature in insulation can is 200-300 ℃; (5) place after 8-10 hour, the temperature slow cooling in insulation can is cooling, is down to after room temperature, takes out rotation axis.
2. the manufacturing process of a kind of large excavator pivot arm high abrasion rotation axis according to claim 1, is characterized in that: comprise the following steps: (1) bearing pin carries out intermediate frequency process, surface hardness 55-60Rc; (2) by the bearing pin placement after intermediate frequency process and insulation can, insulation can is just exposed on bearing pin top, and the temperature in insulation can is 250-280 ℃; (3) ear is pulled to the top end face that is welded on bearing pin, formed after rotation axis (4) welding, rotation axis continues to be placed on 8.5-9.5 hour in insulation can, and the temperature in insulation can is 250-280 ℃; (5) place after 8.5-9.5 hour, the temperature slow cooling in insulation can is cooling, is down to after room temperature, takes out rotation axis.
3. the manufacturing process of a kind of large excavator pivot arm high abrasion rotation axis according to claim 2, is characterized in that: comprise the following steps: (1) bearing pin carries out intermediate frequency process, surface hardness 55-60Rc; (2) by the bearing pin placement after intermediate frequency process and insulation can, insulation can is just exposed on bearing pin top, and the temperature in insulation can is 260 ℃; (3) ear is pulled to the top end face that is welded on bearing pin, formed after rotation axis (4) welding, rotation axis continues to be placed on insulation can interior 9 hours, and the temperature in insulation can is 280 ℃; (5) place after 9 hours, the temperature slow cooling in insulation can is cooling, is down to after room temperature, takes out rotation axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410062610.4A CN103882209A (en) | 2014-02-25 | 2014-02-25 | Process for manufacturing high-wear-resistant rotary shaft of rotary arm of large type excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410062610.4A CN103882209A (en) | 2014-02-25 | 2014-02-25 | Process for manufacturing high-wear-resistant rotary shaft of rotary arm of large type excavator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103882209A true CN103882209A (en) | 2014-06-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410062610.4A Pending CN103882209A (en) | 2014-02-25 | 2014-02-25 | Process for manufacturing high-wear-resistant rotary shaft of rotary arm of large type excavator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103882209A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090155623A1 (en) * | 2007-12-17 | 2009-06-18 | Raghavan Ayer | High strength nickel alloy welds through precipitation hardening |
| CN102179606A (en) * | 2011-02-18 | 2011-09-14 | 济钢集团有限公司 | Welding process for 1,000MPa level non-quenched and tempered high-strength steel |
-
2014
- 2014-02-25 CN CN201410062610.4A patent/CN103882209A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090155623A1 (en) * | 2007-12-17 | 2009-06-18 | Raghavan Ayer | High strength nickel alloy welds through precipitation hardening |
| CN102179606A (en) * | 2011-02-18 | 2011-09-14 | 济钢集团有限公司 | Welding process for 1,000MPa level non-quenched and tempered high-strength steel |
Non-Patent Citations (1)
| Title |
|---|
| 李亚江等主编: "《低合金钢焊接及工程应用》", 30 September 2003 * |
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Application publication date: 20140625 |
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| WD01 | Invention patent application deemed withdrawn after publication |