CN115637403A - Machining process of barreling tool - Google Patents
Machining process of barreling tool Download PDFInfo
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- CN115637403A CN115637403A CN202210183614.2A CN202210183614A CN115637403A CN 115637403 A CN115637403 A CN 115637403A CN 202210183614 A CN202210183614 A CN 202210183614A CN 115637403 A CN115637403 A CN 115637403A
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- burnishing tool
- tool
- roller burnishing
- boride
- barrel
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- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention relates to the technical field of rolling, in particular to a heat treatment processing technology of a roller burnishing tool, which comprises the following steps: (1) charging: loading the roll finishing tool to be processed into a jig; (2) pre-washing: immersing the roller burnishing tool to be processed in a cleaning agent; (3) carburizing: introducing an active carburizing medium; (4) post-washing: cleaning the roller burnishing tool after quenching; and (5) deep cooling: sending the cleaned roller burnishing tool into a deep freezer for deep cooling; (6) tempering: tempering the roller burnishing tool after deep cooling for multiple times; (7) boronizing: and (3) placing the roller burnishing tool after tempering into a boron-containing medium for heating. The machining process can be used for producing high-hardness roller burnishing tools.
Description
Technical Field
The invention relates to the technical field of rolling, in particular to a processing technology of a roller burnishing tool.
Background
The rolling technology is a pressure finishing processing technology, and utilizes the cold plasticity characteristic of metal at normal temperature state, and applies a certain pressure to the surface of a workpiece through a rolling tool, so that the metal on the surface layer of the workpiece generates plastic flow and is filled into the original residual bottom concave trough, and the roughness value of the surface of the workpiece is reduced.
Among them, the roller burnishing tool is a common roller burnishing tool, and generally has different sizes according to different requirements of processing workpieces. The roll finishing tool is used for applying pressure to the surface of a workpiece so as to polish the surface of the workpiece smoothly, so that the force of the surface of the workpiece reacting on the roll finishing tool is large, the roll finishing tool is easy to damage after being used for a period of time, and the service life is short.
Disclosure of Invention
In order to prolong the service life of the roller burnishing tool, the application provides a machining process of the roller burnishing tool.
The application provides a processing technology of a roller burnishing tool, which adopts the following technical scheme:
the machining process of the barreling tool comprises the following steps:
(1) Charging: loading the to-be-processed roll finishing tool into a jig, and vertically placing the to-be-processed roll finishing tool;
(2) Pre-washing: immersing the roller burnishing tool to be processed in a cleaning agent to obtain a front-washed roller burnishing tool;
(3) Carburizing: placing the washed barrel burnishing tool in a carburizing furnace, introducing an active carburizing medium and heating to a unidirectional austenite region for carburizing to obtain a barrel burnishing tool after carburizing,
quenching the roller burnishing tool after carburization to obtain a quenched roller burnishing tool; the active carburizing medium is a mixed gas formed by mixing methanol, propane and nitrogen;
(4) Post-washing: cleaning the roller burnishing tool after quenching to obtain a cleaned roller burnishing tool;
(5) Deep cooling: sending the washed roller burnishing tool into a deep freezer for deep cooling to obtain a deep-frozen roller burnishing tool;
(6) Tempering: tempering the roller burnishing tool after deep cooling for multiple times to obtain a tempered roller burnishing tool;
(7) Boronizing: placing the tempered roller burnishing tool in a boron-containing medium for heating, and naturally cooling to obtain a roller burnishing tool; the boron-containing medium is formed by mixing a boron donor and an energizer according to the weight ratio of (1-2) to (2-3).
After the rod-shaped roller burnishing tool is installed in a furnace, the roller burnishing tool is not easy to deflect and deform in the subsequent treatment process, so that the qualification rate of the roller burnishing tool manufactured by the method is improved. During the carburization process, activated carbon atoms in the activated carburization medium are decomposed and permeate into the surface of the washed barrel burnishing tool, so that the surface layer of the washed barrel burnishing tool has a high carbon layer, and the inside of the high carbon layer has a large amount of carbides uniformly distributed, and the inside of the washed barrel burnishing tool still maintains the original components, so that the barrel burnishing tool manufactured by the method has a high-hardness surface and a high-toughness core part.
Because the cryogenic treatment mainly acts inside the material, the hardness and the wear resistance of the cutter are improved by changing the microstructure of the material, so that the surface hardness and the wear resistance of the roller burnishing tool manufactured by the cryogenic treatment are improved, and the dimensional stability of the roller burnishing tool is improved.
After three times of tempering treatment, the quenching stress of the obtained tempered roller burnishing tool is reduced, and the toughness is improved, so that the manufactured roller burnishing tool is not easy to wear, and the service life of the manufactured roller burnishing tool is prolonged. Compared with the roller burnishing tool manufactured by one-time tempering, the toughness of the roller burnishing tool after three-time tempering treatment is obviously improved; however, compared with the roller burnishing tool subjected to three or more tempering treatments, the toughness of the roller burnishing tool subjected to the three tempering treatments is similar, so that the efficiency of the three tempering treatments is higher, and the toughness of the roller burnishing tool manufactured by the method is better.
In the boronizing process, active boron atoms penetrate into the surface of the roller burnishing tool after tempering to form a penetration layer. The surface of the seeping layer is a hard and brittle iron boride layer, and the inner layer is a puffed ferrous layer with better toughness and higher hardness, so that the roller burnishing tool manufactured by the method can have a surface with higher hardness and a core with better toughness, the surface hardness and the wear resistance of the roller burnishing tool manufactured by the method are improved, the heat resistance and the corrosion resistance of the roller burnishing tool manufactured by the method are improved, and the red hardness of the roller burnishing tool manufactured by the method is improved.
The roller burnishing tool after cleaning is subjected to deep cooling to obtain a roller burnishing tool after deep cooling with good surface hardness, wear resistance and dimensional stability, the roller burnishing tool after deep cooling is subjected to multiple tempering to obtain a roller burnishing tool after tempering with good toughness, and the roller burnishing tool after tempering is subjected to boronizing to obtain the roller burnishing tool with good surface hardness and an inner layer with good toughness. Compared with the roller burnishing tool which is not subjected to deep cooling and is prepared by direct tempering at one time, the roller burnishing tool prepared by deep cooling and tempering preferably has better dimensional stability and toughness of the core. The barrel burnishing tool made by the preferred deep cooling, tempering and boronizing of the present application has a higher red hardness than a barrel burnishing tool made without deep cooling.
Preferably, in the step (7), the boron donor is amorphous boron powder, ferroboron alloy or boride of high-melting point metal, and the boride of high-melting point metal is boride of tantalum, niobium, tungsten or molybdenum.
This application adopts the mode of powder boronizing, adopts amorphous state boron powder, ferroboron alloy or the boride of high melting point metal as for boron agent, and the barrel burnishing tool's that makes from this red hard is higher. However, the boronized layer is brittle, the temperature of the boronized layer is high, and the workpiece is easy to deform, so that deep cooling and three times of tempering are needed in the previous step, the dimensional stability of the roller burnishing tool and the toughness of the core part are improved, and the roller burnishing tool is not easy to peel off or crack in the long-term use process.
Preferably, the boron donor is a mixture of one or more borides of tantalum, niobium, tungsten, molybdenum.
Because the borides of tantalum, niobium, tungsten and molybdenum have better high temperature resistance, the heat resistance of the boronizing layer of the roller burnishing tool made of the borides is improved, and simultaneously, the boronizing layer on the surface layer of the roller burnishing tool is in a boronizing comb-tooth-shaped structure, namely, the boronizing layer is tightly combined on the surface layer of the roller burnishing tool, so that the red hardness of the roller burnishing tool made of the borides is improved.
Preferably, the boron donor is a mixture of tantalum boride, niobium boride, tungsten boride and molybdenum boride which are mixed according to the weight ratio of (1-2) to (1-4) to (1-3) to (2-4).
After the borides of tantalum, niobium, tungsten and molybdenum in the preferable range are mixed according to the preferable mixing proportion, and the boron donor in the preferable range is adopted to participate in the boronizing treatment process, the prepared roller burnishing tool has good red hardness and wear resistance, the surface of the roller burnishing tool has high-temperature oxidation resistance, and the core of the roller burnishing tool has good toughness.
Preferably, the boron donor is a mixture of tantalum boride, niobium boride, tungsten boride and molybdenum boride in a weight ratio of 1.
The roller burnishing tool prepared by the boron donor obtained by the preferred mixing ratio and the boriding treatment according to the preferred boriding treatment has better red hardness, wear resistance and high-temperature oxidation resistance. The surface of the roller burnishing tool is not easy to wear or corrode in the long-term use process, so that the service life of the roller burnishing tool manufactured by the method is prolonged.
Preferably, in the step (3), the penetration enhancer is a mixture of potassium fluoborate and one or two of ammonium chloride and ammonium fluoride.
Potassium fluoborate, ammonium chloride, ammonium fluoride all have better boronizing ability, and the boronizing layer on the roller burnishing tool surface layer that adopts the accelerant agent in this application preferred range to make the wearability and the hardness on roller burnishing tool's surface layer great has improved the red hard nature of roller burnishing tool.
After the potassium fluoborate is mixed with one or two of ammonium chloride and ammonium fluoride, wherein the potassium fluoborate is used as a main energizer, and the ammonium chloride and/or the ammonium fluoride are/is fully mixed with the potassium fluoborate, so that the energizing capability of the potassium fluoborate is improved, and the depth of a boronized layer on the surface layer of the roller burnishing tool manufactured by the method is increased. The wear resistance, hardness and red hardness of the surface layer of the roller burnishing tool are improved.
Preferably, the active carburizing medium is a mixed gas formed by mixing methanol, propane and nitrogen according to the volume ratio of (2-4) to (1-3).
In the gas carburizing process, active carbon atoms are decomposed from an active carburizing medium at high temperature and permeate into the surface layer of the roll finishing tool after quenching, and when the active carburizing medium optimized by the application is adopted for carburizing treatment, the proportion of the active carburizing medium is relatively stable, so that the uniformity of the high carbon layer on the surface of the roll finishing tool after carburizing is better. And the gas carburizing speed is high, the production period is short, and the carburizing efficiency in the mass production process is extremely high.
After the adoption of the preferred active carburizing medium, the surface carbon concentration of the prepared roll burnishing tool after carburization is slightly higher, the layer depth of the carburized layer is larger, the carbon black in the carburizing furnace is less, and an operator can rapidly clean the inside of the carburizing furnace after using the carburizing furnace for a long time. After the carburization treatment is carried out by adopting the preferred active carburization medium, the surface layer of the prepared roll finishing tool has better hardness and wear resistance, and the efficiency of large-batch carburization is higher.
Preferably, in the step (3), air is introduced after the roll finishing tool after carburization is obtained.
After one-time carburization treatment, the carbon concentration in the carburizing furnace is too high, and the carbon concentration in the carburizing furnace can be adjusted after air is introduced, so that the depth of a carburized layer of the roll finishing tool after carburization is adjusted, and the manufactured roll finishing tool after carburization has high surface hardness and high toughness of a core part. In the production process, workers can control the reaction degree in the carburizing furnace by controlling the amount of gas introduced into the carburizing furnace.
Preferably, in step (6), the deep-frozen post-roll finishing tool is tempered three times.
In the application, the toughness of the core part of the roller burnishing tool prepared by three times of tempering is the best, and the high hardness of the surface is kept; if more than three times of tempering are adopted, the red hardness of the surface of the manufactured roll finishing tool is similar to the toughness of the core part, and the energy consumption of production adopting more than three times of tempering is overlarge.
Preferably, in the step (2), the cleaning agent is a water-based metal cleaning agent.
Because the water-based metal cleaning agent is a surfactant, the surfactant can reduce the surface tension of liquid and generate comprehensive effects of directional adsorption, wetting, emulsification, dispersion, solubilization and the like, so that oil stains and the like can be separated from the surface of the tumbling tool to be processed as soon as possible and dispersed into the cleaning solution for the stains on the surface of the tumbling tool to be processed.
When the water-based metal cleaning agent is used for cleaning the to-be-processed roll finishing tool, the surface of the to-be-processed roll finishing tool is not easy to damage, so that a high carbon layer with higher hardness is formed on the surface of the to-be-processed roll finishing tool in the subsequent step.
Preferably, the raw material of the roller burnishing tool to be processed is GCr15 bearing steel.
The GCr15 bearing steel is high-carbon chromium bearing steel with less alloy content, good comprehensive performance and wide application, and has higher wear resistance and fatigue-relieving strength. After the GCr15 bearing steel is subjected to deep cooling, three times of tempering and boronizing in sequence, a high-carbon layer with good red hardness is formed on the surface, and a core with good toughness is arranged inside the bearing steel. And the GCr15 bearing steel has lower cost, so that the production cost for producing the roll finishing tool is reduced.
In summary, the present application has the following beneficial effects:
1. the cleaned roller burnishing tool is subjected to deep cooling, multiple tempering and boronizing in sequence, so that the manufactured roller burnishing tool is not easy to deform, and has a core part with high toughness and a surface layer with high red hardness and good wear resistance;
2. by arranging the boride of tantalum, niobium, tungsten and molybdenum to be matched with the boronizing agent and arranging the subzero treatment before the boronizing treatment, after the dimensional stability of the roller burnishing tool after the subzero treatment is improved, the manufactured roller burnishing tool has higher surface hardness, better wear resistance and better corrosion resistance through the boronizing treatment, and is not easy to be damaged or cracked in the long-time use process;
3. through setting up the mixture of methyl alcohol, propane and nitrogen gas as active carburization medium to let in the air after the carburization is accomplished, make the carburization back of making roll the pipe tool and can have the carburization layer of high rigidity, and the carburization layer is difficult too dark, and the core still can have better toughness.
Drawings
FIG. 1 is a grain boundary diagram of a sample of example 18 of the present application.
Detailed Description
The present application will be described in further detail with reference to examples.
Raw materials
The raw material components of the invention are shown in the table 1:
TABLE 1 sources of the raw Material Components
| Raw materials | Model/brand |
| Ordinary quenching oil | Quick bright quenching oil |
| KR-F400 aqueous solution | KR-F400 |
| Coconut oil acid diethanolamide | Coconut 6501 |
| GCr15 bearing steel | GCr15 |
Examples
Preparation of preparation example 1:
and machining the Gcr15 bearing steel to prepare the to-be-machined barreling tool with the diameter of 100mm and the height of 50 mm.
Example 1
(1) Charging: loading the preparation example 1 into a jig, and vertically placing a barreling tool to be processed;
(2) Pre-washing: immersing the to-be-processed roll finishing tool in a KR-F400 water agent, cleaning at 95 ℃, soaking for 30min, spraying clear water for 15min, and draining for 5min to obtain a front-cleaned roll finishing tool;
(3) Carburizing: placing the washed barrel burnishing tool in a carburizing furnace, introducing 18ml/min methanol gas, 18ml/min propane gas and 9ml/min nitrogen gas, heating to a 900 ℃ unidirectional austenite region, preserving heat for 120min, introducing air to obtain the barrel burnishing tool after carburizing,
quenching the carburized roll finishing tool to obtain a quenched roll finishing tool, wherein common quenching oil is selected as quenching oil;
(4) Post-washing: conveying the quenched tumbling tool into a cleaning tank for cleaning, wherein the cleaning temperature is 95 ℃, soaking for 30min, spraying for 15min, and draining for 5min to obtain the cleaned tumbling tool;
(5) Deep cooling: sending the cleaned roller burnishing tool into a copious cooling machine for copious cooling at the copious cooling temperature of-196 ℃, and preserving heat for 120min, wherein the copious cooling medium adopts liquid nitrogen to obtain the copious cooling roller burnishing tool;
(6) Tempering: tempering the roller burnishing tool after deep cooling for three times, wherein the tempering temperature is 180 ℃ each time, and the heat preservation time is 120min, so as to obtain the roller burnishing tool after tempering;
(7) Boronizing: 10kg of tantalum boride, 10kg of niobium boride, 10kg of tungsten boride and 20kg of molybdenum boride are mixed to obtain a boron donor,
mixing 10kg of potassium fluoborate with 10kg of ammonium chloride to obtain a penetration enhancer;
and (3) placing 2kg of boron donor and 3kg of energizer in a stirrer, stirring and mixing to obtain a boron-containing medium, placing the tempered tumbling tool into a tumbling box, adding the boron-containing medium, heating to 910 ℃, and preserving heat for 2 hours to obtain the tumbling tool.
Examples 2 to 9
The difference from the examples is that the boron donor added in step (7) is different, as shown in table 2.
TABLE 2 boron donor added in examples 2-9
| Boron donor | Tantalum boride (kg) | Niobium boride (kg) | Tungsten boride (kg) | Molybdenum boride (kg) |
| Example 2 | 15 | 10 | 10 | 20 |
| Example 3 | 20 | 10 | 10 | 20 |
| Example 4 | 20 | 20 | 10 | 20 |
| Example 5 | 20 | 40 | 10 | 20 |
| Example 6 | 20 | 20 | 20 | 20 |
| Example 7 | 20 | 20 | 30 | 20 |
| Example 8 | 20 | 20 | 20 | 30 |
| Example 9 | 20 | 20 | 20 | 40 |
Example 10
The difference from example 6 is that in step (7), ammonium chloride was replaced with ammonium fluoride of the same mass.
Example 11
The difference from example 6 is that in step (7), the permeation promoter was replaced with a mixture of 10kg of potassium fluoroborate, 10kg of ammonium chloride and 10kg of ammonium fluoride.
Example 12
The difference from example 11 is that in step (7), the boron donor is replaced with amorphous boron powder.
Example 13
The difference from example 11 is that in step (7), the boron supplying agent is replaced with ferroboron powder.
Examples 14 to 19
The difference from example 11 is that in step (3), the active carburizing medium is introduced, specifically as shown in table 3.
TABLE 3 examples 14-19 activated carburizing media introduced
Example 20
The difference from example 18 is that in step (3), air was not introduced.
Example 21
The difference from example 18 is that in step (2), KR-F400 aqueous solution is replaced by coconut oil fatty acid diethanolamide.
Example 22
The difference from example 18 is that the number of tempering times is two.
Example 23
The difference from example 18 is that the number of tempering times is four.
Comparative example
Comparative example 1
The difference from example 12 is that the roller burnishing tool after cleaning was not subjected to cryogenic treatment, but was directly subjected to tempering treatment.
Comparative example 2
The difference from example 12 is that the roller burnishing tool after deep cooling was directly subjected to boriding treatment without tempering treatment.
Comparative example 3
The difference from example 12 is that the number of tempers in step (6) is one.
Comparative example 4
The difference from example 12 is that the roller burnishing tool after tempering was not boronized.
Performance test
From the roll finishing tools prepared in examples 1 to 21 and comparative examples 1 to 5, 3 specimens having a diameter of 100mm and a height of 50mm were randomly taken for each roll finishing tool to form a set of samples, and the following performance test experiments were performed for each set of samples, and the three monitoring data of each set were averaged.
1. Surface hardness test
The surface Hardness (HV) of the patterns of examples 1 to 21 and comparative examples 1 to 5 was calculated by examining and recording data for each sample using a Vickers hardness tester.
2. Abrasion resistance test
The abrasion loss (mm) of the samples of examples 1 to 21 and comparative examples 1 to 5 was calculated by measuring and recording data for each sample by the wheel abrasion method 3 )。
3. Test of Corrosion resistance
The time (h) at which rust appeared on the surfaces of the samples in examples 1 to 21 and comparative examples 1 to 5 was calculated by examining each sample with reference to the neutral salt spray test in GB/T10125-2021 and recording the data.
And (3) detection results: the results of the tests on the samples of examples 1 to 21 and comparative examples 1 to 5 are shown in Table 4.
TABLE 4 table of performance test results of samples
4. Grain boundary map inspection
The sample of example 18 was cut, sequentially immersed and polished, and the product structure of the sample was examined with a metallographic microscope, the examination results being shown in fig. 1.
Referring to example 12 and comparative example 1 and combining table 4, it can be seen that the samples directly tempered without cryogenic treatment had lower hardness and greater wear loss, and the samples tempered after cryogenic treatment had higher hardness and lesser wear loss, i.e., the barrel burnishing tool produced by cryogenic treatment in the heat treatment process had a surface layer with higher hardness and better wear resistance.
Referring to example 12 and comparative examples 2 and 3, and in combination with table 4, it can be seen that the samples not subjected to tempering had a large wear amount, the samples subjected to only one tempering had a slightly small wear amount, and the samples subjected to three tempering treatments and the samples subjected to four tempering treatments had similar wear amounts, i.e., the roll finishing tool not subjected to tempering treatment in the heat treatment process had a poor surface wear resistance, the roll finishing tool subjected to only one tempering treatment had a slightly poor surface wear resistance, and the roll finishing tools subjected to three or more tempering treatments had good surface wear resistance.
Referring to example 12 and comparative example 4 in combination with table 4, it can be seen that the hardness of the sample produced without the boriding treatment was poor, and the hardness of the sample produced with the boriding treatment was high, i.e., the surface wear resistance of the barrel finished tool produced with the boriding treatment in the heat treatment process was good.
Referring to examples 1 to 9 in combination with table 4, it can be seen that the hardness of the samples prepared using the preferred addition ratios of tantalum boride, niobium boride, tungsten boride, and molybdenum boride in the present application is high, i.e., the hardness of the surface layer of the barrel burnishing tool prepared using the preferred boron donor in the present application in the heat treatment process is high.
Referring to examples 6, 10 and 11 in combination with table 4, it can be seen that the hardness and wear of the samples using the preferred catalyst of the present application are similar, wherein the hardness and wear of the sample using the catalyst of example 11 are the best and the least, i.e. the hardness and wear resistance of the tumbling tool using the catalyst of the present application in the heat treatment process are similar, and wherein the hardness and wear resistance of the tumbling tool finally obtained using the catalyst of the mixture of potassium fluoroborate, ammonium chloride and ammonium fluoride are higher.
Referring to examples 11-13 in combination with Table 4, it can be seen that the samples made with the boron donor agent preferred in the present application have a higher hardness, wherein the samples made with the boron donor agent of example 11 have the highest hardness and the lowest wear, i.e., the barrel burnishing tool made with the boron donor agent preferred in the present application has a higher hardness and better wear resistance.
Referring to examples 11, 14-19 in combination with table 4, it can be seen that samples made with the activated carburizing media preferred herein have greater hardness, less wear and longer time for rust to appear on the surface of the sample, i.e., barrel burnishing tools made with the activated carburizing media preferred herein have greater hardness, better wear resistance and better corrosion resistance.
Referring to examples 18 and 20 in combination with table 4, it can be seen that the samples produced by the carburizing treatment method preferred in the present application have a small amount of wear, i.e., the barrel burnishing tool produced by the carburizing treatment method preferred in the present application has a good wear resistance.
Referring to examples 18 and 21 and table 4, it can be seen that the samples prepared by using the preferred cleaning agent of the present application have similar hardness and abrasion loss, and the samples prepared by using the aqueous KR-F400 as the cleaning agent have slightly longer rust-appearing time on the surface, i.e. the roll finishing tools prepared by using the preferred cleaning agent of the present application have similar hardness and similar abrasion resistance, and the samples prepared by using the aqueous KR-400 as the cleaning agent have better corrosion resistance.
Referring to examples 18, 22 and 23 in combination with table 4, it can be seen that the samples prepared by the preferred number of tempering operations in the present application have better hardness and wear amount and have a slightly longer rust-forming time on the surface, and the samples prepared by the four tempering operations have hardness, wear amount and rust-forming time on the surface similar to the results of the three tempering operations, i.e. the samples prepared by the preferred number of tempering operations in the present application have better surface hardness, wear resistance and corrosion resistance.
In summary, in the examples with higher hardness and better wear resistance and corrosion resistance, the hardness of example 18 is higher, the amount of wear is smaller, and the rust appearing on the surface of the sample takes longer, i.e., the barrel burnishing tool manufactured by the heat treatment processing technology of example 18 has higher hardness and better wear resistance and corrosion resistance.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The machining process of the barreling tool is characterized in that: the method comprises the following steps:
(1) Charging: loading the to-be-processed roll finishing tool into a jig, and vertically placing the to-be-processed roll finishing tool;
(2) Pre-washing: immersing the roller burnishing tool to be processed in a cleaning agent to obtain a front-washed roller burnishing tool;
(3) Carburizing: placing the washed barrel burnishing tool in a carburizing furnace, introducing an active carburizing medium and heating to a unidirectional austenite region for carburizing to obtain a barrel burnishing tool after carburizing,
quenching the roller burnishing tool after carburization to obtain a quenched roller burnishing tool; the active carburizing medium is a mixed gas formed by mixing methanol, propane and nitrogen;
(4) Post-washing: cleaning the roller burnishing tool after quenching to obtain a cleaned roller burnishing tool;
(5) Deep cooling: sending the washed roller burnishing tool into a deep freezer for deep cooling to obtain a deep-frozen roller burnishing tool;
(6) Tempering: tempering the roller burnishing tool after deep cooling for multiple times to obtain a tempered roller burnishing tool;
(7) Boronizing: placing the tempered roller burnishing tool in a boron-containing medium for heating, and naturally cooling to obtain a roller burnishing tool; the boron-containing medium is formed by mixing a boron supply agent and a penetration enhancer in a weight ratio of (1-2) to (2-3).
2. The process for manufacturing a barrel burnishing tool as defined in claim 1, wherein: in the step (7), the boron donor is amorphous boron powder, ferroboron alloy or boride of high-melting point metal, and the boride of high-melting point metal is boride of tantalum, niobium, tungsten or molybdenum.
3. The process for manufacturing a barrel burnishing tool as defined in claim 2, wherein: the boron donor is one or more of boride of tantalum, niobium, tungsten and molybdenum.
4. The process for manufacturing a barrel burnishing tool as defined in claim 3, wherein: the boron supply agent is a mixture of tantalum boride, niobium boride, tungsten boride and molybdenum boride which are mixed according to the weight ratio of (1-2) to (1-4) to (1-3) to (2-4).
5. The process of manufacturing a barrel burnishing tool as defined in claim 4, wherein: the boron supply agent is a mixture formed by mixing tantalum boride, niobium boride, tungsten boride and molybdenum boride according to the weight ratio of 1.
6. The process for manufacturing a barrel burnishing tool as defined in claim 5, wherein: in the step (7), the energizer is a mixture of potassium fluoborate and one or two of ammonium chloride and ammonium fluoride.
7. The process of manufacturing a barrel burnishing tool as defined in claim 6, wherein: in the step (3), the active carburizing medium is a mixed gas formed by mixing methanol, propane and nitrogen according to the volume ratio of (2-4) to (1-3).
8. The process of manufacturing a barrel burnishing tool as defined in claim 7, wherein: and (3) introducing air after obtaining the carburized roll finishing tool.
9. The process for manufacturing a barrel burnishing tool as defined in claim 1, wherein: in the step (6), tempering the roller burnishing tool after deep cooling for three times.
10. The process for manufacturing a barrel burnishing tool as defined in claim 1, wherein: the roll finishing tool to be processed is made of GCr15 bearing steel.
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