CN102974993A - Method for modifying 5CrNiMo hot-forging die - Google Patents
Method for modifying 5CrNiMo hot-forging die Download PDFInfo
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- CN102974993A CN102974993A CN2012105118157A CN201210511815A CN102974993A CN 102974993 A CN102974993 A CN 102974993A CN 2012105118157 A CN2012105118157 A CN 2012105118157A CN 201210511815 A CN201210511815 A CN 201210511815A CN 102974993 A CN102974993 A CN 102974993A
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Abstract
The invention provides a method for modifying a 5CrNiMo hot-forging die. In According to the method, modification is carried out on the basis of an original forging die cavity according to the requirement of a novel forging die cavity, so that waste of a forging die is effectively reduced and the development cost of a novel forging die is reduced. The method comprises the following steps of: (1) cleaning the original die cavity; (2) preheating before welding; (3) rapidly transferring the preheated die to the designated position where the surfacing welding operation is implemented, immediately enveloping the periphery and the upper part of the die with heat insulation cotton, reserving a cavity region to be subjected to surfacing welding, simultaneously heating the lower surface of the die by natural gas and keeping the temperature in the range of 400 DEG C plus and minus 20 DEG C; (4) carrying out surfacing welding, i.e. firstly, carrying out surfacing welding backing by a flux-cored wire RMD535 in the die cavity region according to the requirement for designing the cavity of the novel die and then carrying out surfacing welding forming by a flux-cored wire RMD650; (5) after completing surfacing welding, carrying out tempering on the die, then carrying out furnace cooling, taking out the die, covering the heat insulation cotton and cooling to the room temperature; and (6) machining the die and making the cavity.
Description
Technical field
The present invention relates to the processing field of aviation mould for forging, especially relate to the again technology field of exploitation of blade of aviation engine forging die, aerospace component forging die, be specially a kind of method for remanufacturing of 5CrNiMo hot forged mould.
Background technology
If in the past aviation forging forging die after forging without the Production requirement of follow-up product, then forging die is namely scrapped processing, and forging die is higher to its cost of Mould Machining from the purchasing of raw materials, for the little aviation mould for forging of production lot, all to purchase new mould raw material reprocessing mould if produce each product, certainly will cause a large amount of wastes of mould.
Summary of the invention
For the problems referred to above, the invention provides a kind of method for remanufacturing of 5CrNiMo hot forged mould, its requirement according to new forging die cavity is changed a social system on the basis of original forging die cavity, thereby effectively reduces the waste of forging die, and reduces the development cost of new forging die.
Its technical scheme is like this, it is characterized in that: it may further comprise the steps:
(1) cleaning original mould die cavity;
(2) weld preheating: mould is put into electric furnace be preheated to 450 ℃ ± 10 ℃, and insulation 8h～12h;
(3) with preheated mould fast transfer to the assigned address of implementing the built-up welding operation, and immediately with heat-preservation cotton encase mould around and top, reserve the die cavity zone for the treatment of built-up welding, below mould, maintain the temperature at 400 ℃ ± 20 ℃ with heated by natural gas simultaneously;
(4) built-up welding: the die cavity according to the design new die in the mold cavity zone requires to carry out the built-up welding bottoming with flux-cored wire RMD535 first, carries out built-up welding with flux-cored wire RMD650 again and is shaped;
(5) after built-up welding is finished, mould is carried out tempering, then 550 ℃ ± 10 ℃ of temperatures, insulation 8h～12h cool to 200 ℃ with the furnace, take out mould and add a cover heat-preservation cotton to be cooled to room temperature;
(6) again mould is carried out machined, make die cavity.
It is further characterized in that:
When mold cavity is carried out built-up welding, to carry out hammering with pneumatic pick behind every built-up welding one deck, remove surface film oxide with the rust cleaning pin again;
Described built-up welding, voltage U=30V～38V, electric current I=450A～500A, wire feed rate v=5 m/Min～8m/Min.
Beneficial effect of the present invention is: it adopts, and the method for built-up welding will be scrapped, invalid hot-forging die is transformed into the new new forging die that meets designing requirement, effectively avoid the waste of mould, and save the development cost of new die, greatly reduce enterprise's production cost.
Description of drawings
Fig. 1 is the cavity structure schematic diagram of original mould among the embodiment;
Fig. 2 is the cavity structure schematic diagram of new die among the embodiment;
Fig. 3 is for adopting this method that original mould is carried out the improved mold cavity structure schematic diagram of built-up welding.
The specific embodiment
In conjunction with Fig. 1, Fig. 2 and Fig. 3,1 is original mould among Fig. 3, and 2 are the signal of built-up welding zone; The built-up welding transformation of the way of the cylindrical drum forging die that the below makes take a kind of 5CrNiMo material specifically describes processing step of the present invention as example:
Embodiment one:
At first clear up the mold cavity surface, then mould is put into electric furnace, be heated to 440 ℃ and be incubated 10h, with the assigned address of preheated mould fast transfer to built-up welding, immediately with heat-preservation cotton encase mould around and top, reserve the die cavity zone for the treatment of built-up welding, below mould, maintain the temperature at 420 ℃ with heated by natural gas.With flux-cored wire RMD535 carry out bottoming, flux-cored wire RMD650 carries out built-up welding, by technological requirement built-up welding annulus on original drum barrel mould inner circle basis, simultaneously upwards built-up welding of bottom, boss is along circumferentially built-up welding.In the whole weld deposit process, every weldering one deck will carry out hammering with pneumatic pick, and then removes surperficial oxide layer with the rust cleaning pin, and the built-up welding parameter is voltage U=38V, electric current I=450A, wire feed rate v=6.5m/Min.The postwelding tempering process: be heated to 560 ℃, insulation 8h is chilled to 200 ℃ with stove, takes out and adds a cover heat-preservation cotton and be cooled to room temperature.After tempering process is finished, carry out machined, make die cavity, carry out ultrasound examination, defective do not occur and measure the hardness number HRC47 of mould～50.
Embodiment two:
At first clear up the mold cavity surface, then mould is put into electric furnace, be heated to 450 ℃ and be incubated 8h, with the assigned address of preheated mould fast transfer to built-up welding, immediately with heat-preservation cotton encase mould around and top, reserve the die cavity zone for the treatment of built-up welding, below mould, maintain the temperature at 380 ℃ with heated by natural gas.With flux-cored wire RMD535 carry out bottoming, flux-cored wire RMD650 carries out built-up welding, by technological requirement built-up welding annulus on original drum barrel mould inner circle basis, simultaneously upwards built-up welding of bottom, boss is along circumferentially built-up welding.In the whole weld deposit process, every weldering one deck will carry out hammering with pneumatic pick, and then removes surperficial oxide layer with the rust cleaning pin, and the built-up welding parameter is voltage U=30V, electric current I=475A, wire feed rate v=5 m/Min.The postwelding tempering process: be heated to 550 ℃, insulation 12h is chilled to 200 ℃ with stove, takes out and adds a cover heat-preservation cotton and be cooled to room temperature.After tempering process is finished, carry out machined, make die cavity, carry out ultrasound examination, defective do not occur and measure the hardness number HRC47 of mould～50.
Embodiment three:
At first clear up the mold cavity surface, then mould is put into electric furnace, be heated to 460 ℃ and be incubated 12h, with the assigned address of preheated mould fast transfer to built-up welding, immediately with heat-preservation cotton encase mould around and top, reserve the die cavity zone for the treatment of built-up welding, below mould, maintain the temperature at 400 ℃ with heated by natural gas.With flux-cored wire RMD535 carry out bottoming, flux-cored wire RMD650 carries out built-up welding, by technological requirement built-up welding annulus on original drum barrel mould inner circle basis, simultaneously upwards built-up welding of bottom, boss is along circumferentially built-up welding.In the whole weld deposit process, every weldering one deck will carry out hammering with pneumatic pick, and then removes surperficial oxide layer with the rust cleaning pin, and the built-up welding parameter is voltage U=34V, electric current I=500A, wire feed rate v=8m/Min.。The postwelding tempering process: be heated to 540 ℃, insulation 10h is chilled to 200 ℃ with stove, takes out and adds a cover heat-preservation cotton and be cooled to room temperature.After tempering process is finished, carry out machined, make die cavity, carry out ultrasound examination, defective do not occur and measure the hardness number HRC47 of mould～50.
Flux-cored wire RMD535 in above-described embodiment, flux-cored wire RMD650 are the market current material, and buying is from river, Nanjing connection Welding Technology Co., Ltd.
Claims (3)
1. the method for remanufacturing of a 5CrNiMo hot forged mould, it is characterized in that: it may further comprise the steps:
(1) cleaning original mould die cavity;
(2) weld preheating: mould is put into electric furnace be preheated to 450 ℃ ± 10 ℃, and insulation 8h～12h;
(3) with preheated mould fast transfer to the assigned address of implementing the built-up welding operation, and immediately with heat-preservation cotton encase mould around and top, reserve the die cavity zone for the treatment of built-up welding, below mould, maintain the temperature at 400 ℃ ± 20 ℃ with heated by natural gas simultaneously;
(4) built-up welding: the die cavity according to the design new die in the mold cavity zone requires to carry out the built-up welding bottoming with flux-cored wire RMD535 first, carries out built-up welding with flux-cored wire RMD650 again and is shaped;
(5) after built-up welding is finished, mould is carried out tempering, then 550 ℃ ± 10 ℃ of temperatures, insulation 8h～12h cool to 200 ℃ with the furnace, take out mould and add a cover heat-preservation cotton to be cooled to room temperature;
(6) again mould is carried out machined, make die cavity.
2. the method for remanufacturing of a kind of 5CrNiMo hot forged mould according to claim 1 is characterized in that: when mold cavity is carried out built-up welding, will carry out hammering with pneumatic pick behind every built-up welding one deck, remove surface film oxide with the rust cleaning pin again.
3. the method for remanufacturing of a kind of 5CrNiMo hot forged mould according to claim 2 is characterized in that: described built-up welding, voltage U=30V～38V, electric current I=450A～500A, wire feed rate v=5 m/Min～8m/Min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012105118157A CN102974993A (en) | 2012-12-04 | 2012-12-04 | Method for modifying 5CrNiMo hot-forging die |
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| CN2012105118157A CN102974993A (en) | 2012-12-04 | 2012-12-04 | Method for modifying 5CrNiMo hot-forging die |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103658931A (en) * | 2013-12-30 | 2014-03-26 | 太原重工轨道交通设备有限公司 | Double-layer bead welding method for axle swage block |
| CN106826090A (en) * | 2016-12-30 | 2017-06-13 | 昆山正大新成精密锻造有限公司 | A kind of Piston Rods Die built-up welding preparation technology |
| CN111069494A (en) * | 2019-12-24 | 2020-04-28 | 陈国维 | Manufacturing process of building jacking nut |
| CN111962072A (en) * | 2020-09-18 | 2020-11-20 | 中国第二重型机械集团德阳万航模锻有限责任公司 | Durable large-scale aviation forging die and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103658931A (en) * | 2013-12-30 | 2014-03-26 | 太原重工轨道交通设备有限公司 | Double-layer bead welding method for axle swage block |
| CN103658931B (en) * | 2013-12-30 | 2016-02-10 | 太原重工轨道交通设备有限公司 | The method of the double-deck built-up welding of a kind of axletree swage block |
| CN106826090A (en) * | 2016-12-30 | 2017-06-13 | 昆山正大新成精密锻造有限公司 | A kind of Piston Rods Die built-up welding preparation technology |
| CN106826090B (en) * | 2016-12-30 | 2020-02-18 | 昆山正大新成精密锻造有限公司 | Build-up welding preparation process for connecting rod mold |
| CN111069494A (en) * | 2019-12-24 | 2020-04-28 | 陈国维 | Manufacturing process of building jacking nut |
| CN111962072A (en) * | 2020-09-18 | 2020-11-20 | 中国第二重型机械集团德阳万航模锻有限责任公司 | Durable large-scale aviation forging die and preparation method thereof |
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Application publication date: 20130320 |