CN101396752A - Surfacing method of alloy steel gear-wheel gear-ring transition layer - Google Patents
Surfacing method of alloy steel gear-wheel gear-ring transition layer Download PDFInfo
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- CN101396752A CN101396752A CNA2008101398839A CN200810139883A CN101396752A CN 101396752 A CN101396752 A CN 101396752A CN A2008101398839 A CNA2008101398839 A CN A2008101398839A CN 200810139883 A CN200810139883 A CN 200810139883A CN 101396752 A CN101396752 A CN 101396752A
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Abstract
The invention discloses a method for resurfacing-welding a transition layer of alloy steel gear and gear ring, including the following concrete steps: a machine tooling method is adopted for processing a groove of the transition layer in the alloy steel gear and gear ring, and the groove is cleaned out; the alloy steel gear and gear ring are put in a far-infrared oven for preheating, the preheating temperature is 325 DEG C to 375 DEG C, and the temperature is preserved for 3.5 to 4.5 hours; the alloy steel gear and gear ring are taken out from the far-infrared oven, and multi-layer multi-run welding is carried out by using CO2 gas shield welding; the alloy steel gear and gear ring are put in the oven immediately after welding for heating till being 325 DEG C to 375 DEG C, the temperature is preserved for 1 to 2 hours, and the alloy steel gear and gear ring are cooled to room temperature slowly along with the oven and taken out from the oven. The transition layer is cleared and polished, and then the inner diameter of the gear ring is processed by using a rotary machine tool; after processing, 20% of the gear rings are drawn for ultrasonic inspection examination. The method has the following beneficial effects: after the transition layer of the alloy steel gear and gear ring is resurfacing-welded by using the method, the weldability of the alloy steel gear and gear ring can be greatly enhanced, thereby being capable of avoiding the generation of cold cracks while welding.
Description
Technical field
The present invention relates to the overlaying method of a kind of overlaying method of gear-wheel gear-ring transition layer, particularly a kind of alloy steel gear-wheel gear-ring transition layer.
Background technology
Traditional forcing press gear-wheel gear-ring adopts No. 45 steels to make, and the gear that No. 45 steels are made is after certain heat treatment, and performance can satisfy the instructions for use of forcing press substantially.But for the less forcing press gear of modulus, or high speed high load capacity forcing press, the gear that No. 45 steels are made is aspect combination properties such as intensity, wear-resisting, anti-rippling, antifatigue and service life, and it is not fully up to expectations to seem.For this reason, having occurred a large amount of on the market is the steel alloy gear of representative with 42CrMo, but the carbon equivalent of steel alloy is higher, so the cold cracking inclination of alloy steel gear-wheel gear-ring is bigger, and solderability is very poor, is easy to generate cold crack in welding.
Summary of the invention
The problem to be solved in the present invention is: the overlaying method that a kind of alloy steel gear-wheel gear-ring transition layer is provided, by this method in alloy steel gear-wheel gear-ring behind the built-up welding transition zone, can strengthen the solderability of alloy steel gear-wheel gear-ring greatly, in welding, can avoid the generation of cold crack.
In order to solve the problems of the technologies described above, the overlaying method of alloy steel gear-wheel gear-ring transition layer of the present invention comprises following concrete steps:
1) adopt machine-tooled method, processing transition zone groove is cleaned out groove then in alloy steel gear-wheel gear-ring.
2) alloy steel gear-wheel gear-ring is put into preheating in the far-infrared oven, preheat temperature is 325 ℃-375 ℃, and is incubated 3.5-4.5 hour.
3) alloy steel gear-wheel gear-ring is taken out from far-infrared oven, on positioner, be equipped with uninterruptedly welding by turns of two people rapidly, adopt CO
2Gas shielded arc welding, the diameter of welding wire is 1.0-1.5mm, phosphorus content is lower than 0.10%, welding current 280～350A, voltage 23～38V uses two flame heat simultaneously, with interlayer temperature 〉=150 that guarantee transition zone ℃, carries out multi-pass welding and connects.
4) postwelding advances stove immediately and is heated to 325 ℃-375 ℃, is incubated 1-2 hour, and furnace cooling to room temperature is come out of the stove.
5) to transition zone clear up, reconditioning, with a favourable turn bed processing gear ring internal diameter, make it to reach given size then, and further reduce and shrink constraint stress, after processing, extract 20% and carry out the ultrasonic examination check.
The overlaying method of alloy steel gear-wheel gear-ring transition layer of the present invention, the height of described transition zone will be higher than the degree of depth of groove.
The overlaying method of alloy steel gear-wheel gear-ring transition layer of the present invention, preheat temperature are 325 ℃-375 ℃, and temperature retention time is preferably 4 hours.
The overlaying method of alloy steel gear-wheel gear-ring transition layer of the present invention, postwelding advance stove immediately and are heated to 325 ℃-375 ℃, and temperature retention time is preferably 1.5 hours, and furnace cooling to room temperature is come out of the stove.
The overlaying method of alloy steel gear-wheel gear-ring transition layer of the present invention, the preferred diameter of welding wire is the welding wire of 1.2mm.
The beneficial effect that the present invention obtains is: behind the built-up welding transition zone, can strengthen the solderability of alloy steel gear-wheel gear-ring greatly by the present invention in alloy steel gear-wheel gear-ring, can avoid the generation of cold crack in welding.
Description of drawings
Fig. 1 is the structural representation of alloy steel gear-wheel gear-ring.
Fig. 2 is the structural representation of alloy steel gear-wheel gear-ring transition layer groove.
Among the figure: 1, gear ring, 2, wheel hub, 3, disc, 4, groove
The specific embodiment
The overlaying method of alloy steel gear-wheel gear-ring transition layer of the present invention, by under the condition of high temperature, welding one transition zone on alloy steel gear-wheel gear-ring, when returning to normal temperature, again disc is welded on the transition zone, make alloy steel gear-wheel gear-ring have good solderability, thereby avoided in welding process, cracking, the present invention includes following concrete steps:
The first step, processing transition zone groove: as shown in Figure 2, adopt machine-tooled method, processing transition zone groove 4 is cleaned out groove 4 then in alloy steel gear-wheel gear-ring 1.
In second step, preheating insulation: put alloy steel gear-wheel gear-ring in far-infrared oven preheating, preheat temperature is 325 ℃-375 ℃, and is incubated 4 hours.
The 3rd step, built-up welding transition zone: alloy steel gear-wheel gear-ring is taken out from far-infrared oven, on positioner, be equipped with uninterruptedly welding by turns of two people rapidly, adopt CO
2Gas shielded arc welding, the diameter of welding wire is 1.2mm, phosphorus content is lower than 0.08%, welding current 280～350A, voltage 23～38V uses two flame heat simultaneously, with interlayer temperature 〉=150 that guarantee transition zone ℃, carries out multi-pass welding and connects.
In the 4th step, the insulation after the built-up welding is handled: postwelding advances stove immediately and is heated to 325 ℃-375 ℃, is incubated 1.5 hours, and furnace cooling to room temperature is come out of the stove.
The 5th step, to cleaning, reconditioning and the check of transition zone: to transition zone clear up, reconditioning, with a favourable turn bed processing gear ring internal diameter, make it to reach the size of regulation with disc, further reduce and shrink constraint stress, after processing, extract 20% and carry out the ultrasonic examination check; Can be after the examination and test of products is qualified with disc and the erection welding of gear ring transition zone internal diameter, CO is adopted in welding
2Gas shielded arc welding, but this moment needn't be to preheating.
Fig. 1 is the structural representation of alloy steel gear-wheel gear-ring, at this moment, on the wheel hub that is welded to gear ring 12 that disc 3 is firm, and does not have crackle, and has increased the intensity of alloy steel gear-wheel gear-ring greatly.
Claims (5)
1. the overlaying method of an alloy steel gear-wheel gear-ring transition layer is characterized in that: comprise following concrete steps:
1) adopt machine-tooled method, processing transition zone groove is cleaned out groove then on alloy steel gear-wheel gear-ring.
2) alloy steel gear-wheel gear-ring is put into preheating in the far-infrared oven, preheat temperature is 325 ℃-375 ℃, and is incubated 3.5-4.5 hour.
3) alloy steel gear-wheel gear-ring is taken out from far-infrared oven, on positioner, be equipped with uninterruptedly welding by turns of two people rapidly, adopt CO
2Gas shielded arc welding, the diameter of welding wire is 1.0-1.5mm, phosphorus content is lower than 0.10%, welding current 280～350A, voltage 23～38V uses two flame heat simultaneously, with interlayer temperature 〉=150 that guarantee transition zone ℃, carries out multi-pass welding and connects.
4) postwelding is put alloy steel gear-wheel gear-ring in the far-infrared oven into immediately, is heated to 325 ℃-375 ℃, is incubated 1-2 hour, and furnace cooling to room temperature is come out of the stove.
5) to transition zone clear up, reconditioning, with a favourable turn bed processing gear ring internal diameter, make it to reach given size then, and further reduce and shrink constraint stress, after processing, extract 20% and carry out the ultrasonic examination check.
2. the overlaying method of alloy steel gear-wheel gear-ring transition layer according to claim 1, it is characterized in that: the height of described transition zone will be higher than the degree of depth of groove.
3. the overlaying method of alloy steel gear-wheel gear-ring transition layer according to claim 1 and 2, it is characterized in that: preheat temperature is 325 ℃-375 ℃, and temperature retention time is 4 hours.
4. the overlaying method of alloy steel gear-wheel gear-ring transition layer according to claim 1 and 2 is characterized in that: postheating to 325 ℃-375 ℃, temperature retention time is 1.5 hours.
5. the overlaying method of alloy steel gear-wheel gear-ring transition layer according to claim 1 and 2, it is characterized in that: the diameter of welding wire is 1.2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101398839A CN101396752A (en) | 2008-09-22 | 2008-09-22 | Surfacing method of alloy steel gear-wheel gear-ring transition layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101398839A CN101396752A (en) | 2008-09-22 | 2008-09-22 | Surfacing method of alloy steel gear-wheel gear-ring transition layer |
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| CN101396752A true CN101396752A (en) | 2009-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008101398839A Pending CN101396752A (en) | 2008-09-22 | 2008-09-22 | Surfacing method of alloy steel gear-wheel gear-ring transition layer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101913013A (en) * | 2010-08-18 | 2010-12-15 | 中信重工机械股份有限公司 | Process for assembling and welding middle-hard teeth surface welded gear |
| CN102950369A (en) * | 2012-10-24 | 2013-03-06 | 荣成锻压机床有限公司 | Method for welding 42CrMo alloy steel herringbone gear |
| CN102990315A (en) * | 2012-12-20 | 2013-03-27 | 常熟市大生机械厂 | Preparation method of large gear ring on rotary drum of large concrete mixer |
| CN103817412A (en) * | 2014-02-28 | 2014-05-28 | 中信重工机械股份有限公司 | Welding technology of cutter heads and cutter holders of hard-rock tunnel boring machine |
-
2008
- 2008-09-22 CN CNA2008101398839A patent/CN101396752A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101913013A (en) * | 2010-08-18 | 2010-12-15 | 中信重工机械股份有限公司 | Process for assembling and welding middle-hard teeth surface welded gear |
| CN101913013B (en) * | 2010-08-18 | 2013-05-22 | 中信重工机械股份有限公司 | Process for assembling and welding middle-hard teeth surface welded gear |
| CN102950369A (en) * | 2012-10-24 | 2013-03-06 | 荣成锻压机床有限公司 | Method for welding 42CrMo alloy steel herringbone gear |
| CN102990315A (en) * | 2012-12-20 | 2013-03-27 | 常熟市大生机械厂 | Preparation method of large gear ring on rotary drum of large concrete mixer |
| CN103817412A (en) * | 2014-02-28 | 2014-05-28 | 中信重工机械股份有限公司 | Welding technology of cutter heads and cutter holders of hard-rock tunnel boring machine |
| CN103817412B (en) * | 2014-02-28 | 2015-12-02 | 中信重工机械股份有限公司 | A kind of cutterhead of hard rock mole and the welding procedure of tool rest |
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Open date: 20090401 |