CN107271537A - A kind of high-performance bearing grinding burn comprehensive test decision method - Google Patents
A kind of high-performance bearing grinding burn comprehensive test decision method Download PDFInfo
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- CN107271537A CN107271537A CN201710515345.4A CN201710515345A CN107271537A CN 107271537 A CN107271537 A CN 107271537A CN 201710515345 A CN201710515345 A CN 201710515345A CN 107271537 A CN107271537 A CN 107271537A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
Abstract
A kind of high-performance bearing grinding burn comprehensive test decision method, it is related to a kind of inspection decision method, and in particular to a kind of high-performance bearing grinding burn comprehensive test decision method.The present invention is in order to solve the problem of raceway grinding burn recall rate is relatively low.The present invention's concretely comprises the following steps：Step 1: replacing nitration mixture to carry out bearing steel ring inspection with mono-acid in production process；Step 2: formulating burn collection of illustrative plates；Step 3: carrying out grinding burn inspection to fabricated part by magnetic bullet instrument；Step 4: physico-chemical analysis judges.The invention belongs to bearing quality detection field.
Description
Technical field
Decision method is examined the present invention relates to one kind, and in particular to a kind of high-performance bearing grinding burn comprehensive test judges
Method, belongs to bearing quality detection field.
Background technology
N4 steel is the preferred material of current domestic high performance turbine bearing, because of the intensity, hardness and heat-resisting quantity of the material
Plain bearing steel ZGCr15 can be better than, with the increase of domestic air mail bearing demand since 2008, using the material
Bearing designation and quantity are also being continuously increased.
But because domestic manufacturer grasps limited for the processing characteristics of the material, what raceway was produced in Grinding Process
Burning problems could not also be solved at all, therefore in follow-up checkout procedure, by examining control device to have grinding burn part
Effect detection, it is to avoid problem component assembly is dispatched from the factory particularly important.
The generation of the full grinding burn of raceway table, is due to that contact surface of the emery wheel with raceway is curved, connects
Contacting surface is coincide, and property is strong, and heat-dissipating space is small, and coolant is not easily accessible and easily produces heat aggregation, especially machined parameters setting not
Rationally, the selection of abrasive material is improper or cooling it is not enough when, grinding heat can drastically be raised in moment, and height is formed in raceway face
Temperature softening layer, produces grinding burn.
Grinding burn can be such that raceway surface fatigue resistance and life-span substantially reduces., should in alternation in the course of work
In the presence of power, extend from ball race grinding burn area formation crackle and constantly, ultimately form fatigue flake.
Checked for lasso grinding burn, bearing producer of the existing country mainly by the method for cold pickling, but due to composition and
The difference of performance, the grinding burn problem of N4 steel raceways is more than ordinary steel bearing (ZGCr15 steel bearings), and N4 steel bushings
Enclose that machining control difficulty is big, the grinding burn pattern and light and heavy degree of part are various, state complex, only by conventional pickling
Measuring means is difficult effectively to detect grinding burn part, it is necessary to take comprehensive detection control method.
The content of the invention
The present invention proposes a kind of high-performance bearing mill to solve the problem of raceway grinding burn recall rate is relatively low
Cut burn comprehensive test decision method.
The present invention adopts the technical scheme that to solve the above problems：The method of the invention is comprised the following steps that：
Step 1: replacing nitration mixture to carry out bearing steel ring inspection with mono-acid in production process；
Step 2: formulating burn collection of illustrative plates；
Step 3: carrying out grinding burn inspection to fabricated part by magnetic bullet instrument；
Step 4: physico-chemical analysis judges.
The beneficial effects of the invention are as follows：1 method of inspection of the present invention between 2012 to 2014 to processed in factory 2
Detection burn part 258, effectively identifies burn part in ten thousand more than one piece bearing rings, substantially increases the recall rate of burn part；
2nd, timely, effective identification is carried out to grinding burn part by synthetic determination method, is enabled a company in production and processing and technique
Taken measures in time in terms of control, promote the raising of production technology ability；3rd, the present invention is directed to N4 steel (W9Cr4V2Mo)
Aircraft bearing grinding burn part, the comprehensive test of the mono-acid pickling test method taken, the detection of magnetic bullet instrument and physico-chemical analysis judges
Method, is that domestic air mail Production of bearing producer provides new idea and method in terms of grinding burn inspection technology, makes bearing
The quality of production and be protected using reliability；4th, the present invention can use for reference the bearing applied to all models and structure in grinding
Burn in process examines control.
Brief description of the drawings
Fig. 1 is raceway grinding schematic diagram.
Embodiment
Embodiment one：Illustrate present embodiment, a kind of high-performance bearing grinding described in present embodiment with reference to Fig. 1
Burn comprehensive test decision method is achieved by the steps of：
Step 1: replacing nitration mixture to carry out bearing outer ring inspection with mono-acid in production process；
Step 2: formulating burn collection of illustrative plates；
Step 3: carrying out grinding burn inspection to fabricated part by magnetic bullet instrument；
Step 4: physico-chemical analysis judges.
Judge there is exception when pickling test and magnetic bullet instrument are detected in step 4, when also needing to further appreciate that burn degree,
Sample can be also cut, passes through metallography microscope sem observation, it is seen that the tissue of ball race grinding burned part has substantially poor with matrix
Different, white light tone is quenched damage, and black is burnt for tempering, and generally burn layer has certain thickness, has obvious point with matrix
Boundary.
Embodiment two：Illustrate present embodiment, a kind of high-performance bearing grinding described in present embodiment with reference to Fig. 1
Nitration mixture is replaced to carry out the step of bearing steel ring is examined with mono-acid in production process in the step of burn comprehensive test decision method one
It is as follows：
Step one (one), degreasing：It is that 2.5-3.5%, tertiary sodium phosphate content are 2.5-3.5%, hydrogen with Carbon Dioxide content
Sodium oxide content is the mixed solution cleaning part that 1-2%, waterglass content are 0.2-0.3%, and cleaning temperature is 75 DEG C~85
DEG C, scavenging period is 3 minutes；
Step one (two), continuous moisture film inspection：Piece surface is moistened completely, visually observe within 30 seconds, piece surface
It is qualified without moisture film breaking state；
Step one (three), salt acid dip：Part is impregnated with content of hydrochloric acid 4%-6% hydrochloric acid solution 1.5-3.5 minutes, it is molten
Liquid temperature degree is 15 DEG C~25 DEG C；
Step one (four), pickling：It is molten with nitric acid content 2.5%-3.5% salpeter solution pickling part 1.5-2.5 minutes
Liquid temperature degree is 15 DEG C~25 DEG C；
Step one (five), brightization：With content of hydrochloric acid 4%-6% hydrochloric acid solution brightization part 1.5-3.5 minutes, solution temperature
Spend for 15 DEG C~25 DEG C；
Step one (six), neutralization：With in 3%-5% natrium carbonicum calcinatum and piece surface liquid, the reaction time is 1-2 points
Clock, reaction temperature is 15 DEG C~25 DEG C；
Step one (seven), antirust：The natrium nitrosum parts processed table of natrium carbonicum calcinatum, 8%-10% for 1%-2%
Face, the reaction time is 1-2 minutes, and reaction temperature is 15 DEG C~25 DEG C.
Pickle is entered using nitric acid (3.5-4.5%) and iron chloride (2.5-3.5%) mixed acid in original acid cleaning process
Row pickling, then carries out brightization by chromic anhydride (13-15%) and sulfuric acid (0.4%) mixed acid, due to pickle corrosivity compared with
By force, surface is in deeper black gray expandable after lasso pickling, and burned part has color distortion (more in striated) with intact surface, examines
When testing personnel and checking by visual observation, because surface state is poor, slight burn phenomenon is difficult to be detected, and there is the possibility of erroneous judgement；
In addition, as impurity is constantly mixed into pickle in cleaning process, the ratio composition of mix acid liquor is continually changing, the mistake to acid solution
Journey detects that proportioning guarantee brings certain difficulty.Using mono-acid acid cleaning process N4 steel shafts can be made to hold ball race grinding burn and show more clear
Clear, it is to avoid after the conventional nitration mixture pickling (nitric acid and iron chloride mixed acid) used, bearing surface blacks, and slight grinding burn is not
Easy to identify the problem of.In addition, mono-acid mode it also avoid the problem of component content is whard to control during nitration mixture pickle use,
Substantially increase the accuracy of pickling inspection.
Embodiment three：It is to compare identification in checkout procedure for convenience that burn collection of illustrative plates is formulated in step 2, to mill
Cut burn part pattern, degree, distributing position and carry out combing classification, formulated pickling burn part collection of illustrative plates, take after element pickling with
Collection of illustrative plates pattern is compareed, it is ensured that burn part is effectively identified, it is to avoid judged by accident, the generation for problem of failing to judge.
Embodiment four：On the basis of pickling test, further strengthen the control to ball race grinding burning problems,
Research of the Barkhausen noise analysis method in raceway burn context of detection is carried out by existing magnetic bullet instrument equipment；This is a kind of
Lossless detection method, is, to the infiltrative difference of magnetic, to form magnetic bullet value (mp values) data and curves by piece surface, so as to rolling
Road is differentiated with the presence or absence of grinding burn.
The advantage of this method is the control that can be tested to part not damaged in the finished product lasso stage, and equipment is easy to operate,
Part burn degree can be quantified by data comparison.
Magnetic bullet instrument detection method and defining standard it is clear and definite, be the control of grinding burn problem, and the part that ensures to burn have
Effect detection strengthens guarantee.By the inspection that bearing, 12891 lassos of totally 163 specifications are returned to finished product lasso in factory and user
Survey and the comparative analysis of magnetic bullet value (mp values) change curve, finally determine magnetic bullet instrument detection method, and define as magnetic bullet value mp
≤ 80, and be qualified during max/min ＜ 1.2, as magnetic bullet value mp ＞ 80, and during max/min ＞ 1.2 there is grinding burn wind in lasso
Danger, can be scrapped.
The above described is only a preferred embodiment of the present invention, any formal limitation not is made to the present invention, though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any to be familiar with this professional technology people
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
For the equivalent embodiment of equivalent variations, as long as be without departing from technical solution of the present invention content, according to the technical spirit of the present invention,
Within the spirit and principles in the present invention, any simple modification, equivalent substitution and improvement for being made to above example etc., still
Belong within the protection domain of technical solution of the present invention.
Claims (2)
1. a kind of high-performance bearing grinding burn comprehensive test decision method, it is characterised in that：A kind of high-performance bearing mill
Burn comprehensive test decision method is cut to be achieved by the steps of：
Step 1: replacing nitration mixture to carry out bearing steel ring inspection with mono-acid in production process；
Step 2: formulating burn collection of illustrative plates；
Step 3: carrying out grinding burn inspection to fabricated part by magnetic bullet instrument；
Step 4: physico-chemical analysis judges.
2. a kind of high-performance bearing grinding burn comprehensive test decision method according to claim 1, it is characterised in that：Step
The step of replacing nitration mixture progress bearing steel ring to examine with mono-acid in production process in one is as follows：
Step one (one), degreasing：It is that 2.5-3.5%, tertiary sodium phosphate content are 2.5-3.5%, hydroxide with Carbon Dioxide content
Sodium content is the mixed solution cleaning part that 1-2%, waterglass content are 0.2-0.3%, and cleaning temperature is 75 DEG C~85 DEG C, clearly
The time is washed for 3 minutes；
Step one (two), continuous moisture film inspection：Piece surface is moistened completely, visually observe within 30 seconds, piece surface is anhydrous
Film breaking state is qualified；
Step one (three), salt acid dip：Part is impregnated with content of hydrochloric acid 4%-6% hydrochloric acid solution 1.5-3.5 minutes, solution temperature
Spend for 15 DEG C~25 DEG C；
Step one (four), pickling：With nitric acid content 2.5%-3.5% salpeter solution pickling part 1.5-2.5 minutes, solution temperature
Spend for 15 DEG C~25 DEG C；
Step one (five), brightization：With content of hydrochloric acid 4%-6% hydrochloric acid solution brightization part 1.5-3.5 minutes, solution temperature is
15 DEG C~25 DEG C；
Step one (six), neutralization：With in 3%-5% natrium carbonicum calcinatum and piece surface liquid, the reaction time is 1-2 minutes,
Reaction temperature is 15 DEG C~25 DEG C；
Step one (seven), antirust：The natrium nitrosum parts processed surface of natrium carbonicum calcinatum, 8%-10% for 1%-2%, instead
It is 1-2 minutes between seasonable, reaction temperature is 15 DEG C~25 DEG C.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110836806A (en) * | 2019-11-29 | 2020-02-25 | 中国航发中传机械有限公司 | Magnetic-elastic grinding burn detection method for acid-corrosion-resistant steel gear |
| CN113878445A (en) * | 2021-09-23 | 2022-01-04 | 上海振华轴承总厂有限公司 | Grinding process method for blackening outer ring raceway on surface of crossed bearing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110836806A (en) * | 2019-11-29 | 2020-02-25 | 中国航发中传机械有限公司 | Magnetic-elastic grinding burn detection method for acid-corrosion-resistant steel gear |
| CN113878445A (en) * | 2021-09-23 | 2022-01-04 | 上海振华轴承总厂有限公司 | Grinding process method for blackening outer ring raceway on surface of crossed bearing |
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Application publication date: 20171020 |