CN1019902C - Press roller coated with wear-resisting alloy and its production process - Google Patents
Press roller coated with wear-resisting alloy and its production process Download PDFInfo
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- CN1019902C CN1019902C CN 91100436 CN91100436A CN1019902C CN 1019902 C CN1019902 C CN 1019902C CN 91100436 CN91100436 CN 91100436 CN 91100436 A CN91100436 A CN 91100436A CN 1019902 C CN1019902 C CN 1019902C
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- roller
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- powder
- wear
- vacuum sintering
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Abstract
The present invention relates to a method for producing and repairing an antiwear pressing roller for a granular feed pressing machine. The present invention is characterized in that the external surface of a steel roller blank is melted and combined with alloy roller teeth with excellent antiwear performance by a vacuum sintering and coating method. When roller teeth of the coating pressing roller or the roller teeth of a traditional steel pressing roller are all or partially worn in the process of using, the roller teeth can be completely repaired by a vacuum sintering and repairing method. The roller teeth are firmly bonded with the roller blank in a metallurgical mode and can not fall off, wherein the roller teeth are coated or repaired by new vacuum sintering technology. The hardness of antiwear alloy roller teeth reaches as high as about HRc65.
Description
The pressure roller that the present invention relates to a kind of vacuum sintering coating process and make with this method, specifically, the present invention relates to a kind of vacuum sintering coating process of press roller coated with wear-resisting alloy and press roller coated with wear-resisting alloy of using with a kind of pellet feed mill of this method manufacturing made.This method is also applicable to repairing the pressure roller that pellet feed mill is used.
In pellet feed mill, limited the production of pellet owing to the rapid wearing of pressing mold and pressure roller, especially pressure roller.Generally adopt straight carbon steel both at home and abroad, as No. 45 steel or tool steel, make pressure roller as the 55Cr steel, after heat treatment the hardness of roller surface roller tooth can only reach more than the HRc50 to 55.Because hardness is lower, in use roller tooth abrasion is exceedingly fast.Twenties days at most, three to five days at least, the roller tooth promptly was worn away and pressure roller is scrapped.If when further improving the hardness of pressure roller with heat treatment method, then pressure roller becomes crisp and very easily ftractures.
The object of the present invention is to provide a kind of press roller coated with wear-resisting alloy and manufacture method made from the vacuum sintering new technology thereof.This press roller coated with wear-resisting alloy is characterised in that the outer surface at the steel roller stock is compounded with the antifriction alloy roller tooth of being made up of Ni-02 surface hardening agent powder and tungsten carbide powder (WC powder), and the content of tungsten carbide powder is 16-24%, and the content of Ni-02 surface hardening agent powder is 84-76%.The vacuum sintering coating process of this manufacturing press roller coated with wear-resisting alloy is characterised in that the antifriction alloy powder that furnishing in advance is coated with cream presses the outer surface of the shape coated of roller tooth at the steel roller stock, in the vacuum sintering stove, adopt 5 * 10-1 * 10mmHg vacuum then, at 1050-1170 ℃, be incubated 30-45 minute vacuum sintering process system.Straight empty clinkering technology has multiple function, as fusion bonded forming, clinkering soldering, clinkering sealing of hole, clinkering coating and clinkering repairing etc.The present invention has just used back two kinds of functions, the present invention finishes by following technical proposals: at first the method with the conventional base pickling cleans up the steel roller stock, press table 1 proportioning, Ni-02 surface hardening agent powder and tungsten carbide powder (WC powder) are fitted in the coating powder, add bonding the reconciling into together of an amount of retinal again and be coated with cream.Being coated with the cream trowelling outer surface of clean roller stock shown in 1 in the accompanying drawings, put into baking oven behind the roller tooth of formation shown in 2, under 2000 ℃ temperature, dry, and then put in the vacuum sintering stove and carry out vacuum sintering by following technological parameter:
Vacuum 5 * 10
-2～1 * 10
-2MmHg
1050～1130 ℃ of temperature
Temperature retention time 30～45 minutes
Through after the clinkering, be coated in the roller tooth of roller stock outer surface, promptly from original coating powder state, the process fusion is condensed and is become hard alloy roller tooth, as long as suitably grasp the temperature and the temperature retention time of clinkering, just can make the press roller coated with wear-resisting alloy that between roller tooth and the roller stock necessary element counterdiffusion takes place and form the synthetic integral body of metallurgical junction.The roller teeth size is generally tooth depth 1.5～0.3mm, the facewidth 2.5～4mm.
(table 1 is seen below)
The WC powder can adopt commercially pure WC to get final product during batching, and the granularity of Ni-02 surface hardening agent powder is preferably in below 325 orders, and the chemical composition of Ni-02 surface hardening agent powder is listed in table 2.
(table 2 is seen below)
If the roller tooth of pressure roller has been worn in long use or has ground to the greatest extent, the method that can adopt vacuum sintering to repair is repaired the roller tooth.The vacuum sintering method for repairing and mending is the repetition fully of above-mentioned vacuum sintering coating process basically, and different is must trowelling whole piece roller tooth, and need only be on the basis of the remaining roller tooth in back that is worn polishing roller tooth again.
Embodiment
According to the content of foregoing invention, made that to be used in various flat-dies press roller coated with ring five groups of mould, table 3 has been enumerated material, size and the adapted pressing mold specification of five kinds of press roller coated with wear-resisting alloy.
(table 3 is seen below)
The pressure roller made from the inventive method and the advantage of this method are:
1. this pressure roller has the hardness height, and toughness is strong, and can not ftracture;
2. roller tooth hardness is very high, more than HRc60, even reaches more than the HRc65;
3. long service life, low cost of manufacture.
4. the pressure roller of having scrapped with this method reparation makes to be worn away
Table 1 coating powder proportioning
Ni-02 84～76%
Surface hardening agent powder
WC powder 16～24%
The chemical composition (weight %) of table 2 Ni-02 surface hardening agent powder
C Si B Cr Fe Ni oxygen content fusion temperature ℃
0.72/0.84 3.5/4.2 3.0/3.8 13/16≤5 surplus≤0.08 1000/1080
The specification of the size of table 3 embodiment press roller coated with wear-resisting alloy, material and adapted pressing mold
Group pressure roller diameter pressure roller material adapted pressing mold specification
(mm) roller stock roller tooth
100 No. 45 steel Ni-02 of 1 Φ 84%+WC16% Φ, 231 flat-dies
The same CPM12 of 2 Φ, 150 55Cr ", Φ 305 ring moulds
The same Φ 306 flat-dies of 180 No. 45 steel of 3 Φ
4 Φ, 206 40CrMn Ni-02 76%+WC24% CPM16 ", Φ 407 ring moulds
Mo
The same CPM20 of 5' Φ 220 40CrMn ", Φ 507 ring moulds
Mo
Roller tooth regeneration.
5. this method is easy to implement on the prior art level, and utilization this method has tangible economic benefit.
Claims (2)
1, the press roller coated with wear-resisting alloy used of a kind of pellet feed mill.It is characterized in that the outer surface at the steel roller stock is compounded with the antifriction alloy roller tooth of being made up of Ni-02 surface hardening agent powder and tungsten carbide powder (WC powder), and the content of tungsten carbide powder is 16-24%, the content of the surperficial hardening agent powder of Ni-02 is 84-76%.
2, a kind of vacuum sintering coating process of making press roller coated with wear-resisting alloy, it is characterized in that the antifriction alloy powder that furnishing in advance is coated with cream presses the outer surface of the shape coated of roller tooth at the steel roller stock, in straight empty alloying furnace, adopt 5 * 10-1 * 10mmHg vacuum then, at 1050-1170 ℃, be incubated 30-45 minute vacuum sintering process system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91100436 CN1019902C (en) | 1991-01-29 | 1991-01-29 | Press roller coated with wear-resisting alloy and its production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91100436 CN1019902C (en) | 1991-01-29 | 1991-01-29 | Press roller coated with wear-resisting alloy and its production process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1055133A CN1055133A (en) | 1991-10-09 |
| CN1019902C true CN1019902C (en) | 1993-02-17 |
Family
ID=4904630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91100436 Expired - Fee Related CN1019902C (en) | 1991-01-29 | 1991-01-29 | Press roller coated with wear-resisting alloy and its production process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1019902C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2740553A1 (en) * | 2012-12-07 | 2014-06-11 | Sandvik Intellectual Property AB | Method for manufacture of HIP consolidated component |
-
1991
- 1991-01-29 CN CN 91100436 patent/CN1019902C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1055133A (en) | 1991-10-09 |
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