Bearing Inner Ring Raceway Low-Temperature Aerosol Cooling Lubrication Grinding
Round 1
Reviewer 1 Report
1. The authors pay too much words on the introduction of the equipments, not only the developed one, but also the applied, such as the XRD， CNC grinding machine;
2. The error analysis of the measured data should be given in detail, for example, the grinding force;
3.The grinding temperature should be measured to show the effect of the low-temperature aerosol cooling lubrication grinding;
4. The simulation and the experimental results on the surface roughness must be given.
Moderate editing of English language should be undertaken.
Author Response
- The authors pay too much words on the introduction of the equipments, not only the developed one, but also the applied, such as the XRD， CNC grinding machine;
Response:Revised. Please check in line 228 and line 336.
- The error analysis of the measured data should be given in detail, for example, the grinding force;
Response:Revised. Please check in line 266.
- The grinding temperature should be measured to show the effect of the low-temperature aerosol cooling lubrication grinding;
Response:Revised. Please check in line 286.
- The simulation and the experimental results on the surface roughness must be given.
Response:Revised. Please check in line 482.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
1. The quantitative and innovative experimental results should be contained in the Abstract section.
2. This paper focuses on the low temperature cooling grinding, but the introduction main about the MQL, and little references about the grinding. The introduction sextion should be rewritten, the related references are too little in the introduction section, and the references do not be cited in the paper.
3. The paper provides the properties of LB-2000 vegetable spray cutting oil, but does not offer the properties of PC-621F cutting fluid.
4. The paper should offer the detailed information and properties of grinding wheel and workpiece material.
5. In Figure 12, how about the comparison of LB-2000 and PC-621F cutting fluid on the grinding force?
6. The calculation process of grinding force should be added in the paper.
7. The is too little introduction and information about the temperature measurement, and the results analysis about the grinding temperature is too few.
8. In the whole, the theoretical analysis on the experimental results is tool poor, the effect of grinding fluid on the surface roughness also should be added in the paper.
No.
Author Response
- The quantitative and innovative experimental results should be contained in the Abstract section.
Response:revised.Important data has been added
- This paper focuses on the low temperature cooling grinding, but the introduction main about the MQL, and little references about the grinding. The introduction sextion should be rewritten, the related references are too little in the introduction section, and the references do not be cited in the paper.
Response:revised.Related content has been added
- The paper provides the properties of LB-2000 vegetable spray cutting oil, but does not offer the properties of PC-621F cutting fluid.
Response:revised.Related content has been added
- The paper should offer the detailed information and properties of grinding wheel and workpiece material.
Response:revised.Related content has been added
- In Figure 12, how about the comparison of LB-2000 and PC-621F cutting fluid on the grinding force?
Response:revised.Grinding force calculation was added
- The calculation process of grinding force should be added in the paper.
Response:revised.Related content has been added
- The is too little introduction and information about the temperature measurement, and the results analysis about the grinding temperature is too
few.
Response:revised.Grinding temperature calculation was added
- In the whole, the theoretical analysis on the experimental results is tool poor, the effect of grinding fluid on the surface roughness also should be added in the paper.
Response:revised.Roughness analysis calculations have been added.
Author Response File: Author Response.pdf
Reviewer 3 Report
Comments for author File: Comments.pdf
Acceptable
Author Response
- How was the residual stress distribution measured?
Response: Residual stress test content has been added.
- Information such as images on the grinded surface are necessary, especially when considering residual stresses. For instance, stresses can be dissipated through surface generation (e.g., crack or pit formations), which would lower the measured stresses. Subsequently, a correlation between the surface topography and the temperature as an effect of the lubricant should be given.
Response:The grinding heat test content has been added, the grinding force test content has been added, and the grinding roughness analysis has been added.
- Firstly, experimental validation of the grinding temperature with respect to the theoretical value calculated in Eq. 1 should be given. Then, highlight how the changes in temperature would affect the changes in residual stresses (e.g., microstructural changes? Recrystallization effects? Etc.).
Response:The effect of temperature on residual stresses has been added.
- Cite and comment on the potential participation of the mechanochemical effect with the use of the grinding fluid. It is important to discuss this aspect as the mechanochemical effect has been shown to affect the material removal process and effect microstructural changes on machined surfaces.
Response:The content of the physical properties of the cutting fluid has been added.
Thank you very much.
Round 2
Reviewer 1 Report
The authors have revised the manuscript accordingly, and accept for publication is suggested.
Writes and reads well
Author Response
Thank you very much, this article has been modified using MDPI's language editing service.
Reviewer 2 Report
1. There is almost no literatures review in the introduction section.
2. The properties of PC-621F cutting fluid also should be listed as table form.
3. How about the type and size of abrasive particles in the grinding wheel.
4. The calcualtion process of grinding force should be more clear, pleasure offer the formula derivation.
5. Thesis writing in the paper should be more in line with academic norms .
Thesis writing in the paper should be more in line with academic norms .
Author Response
- There is almost no literatures review in the introduction section.
Response：Revised. Please check in line 59.
- The properties of PC-621F cutting fluid also should be listed as table form.
Response：Revised. Please check in line 185.
- How about the type and size of abrasive particles in the grinding wheel.
Response：Revised. Please check in line 239.
- The calcualtion process of grinding force should be more clear, pleasure offer the formula derivation.
Response：Revised. Please check in line 269.
- Thesis writing in the paper should be more in line with academic norms .
Response：Revised. Thank you very much.
Author Response File: Author Response.pdf
Reviewer 3 Report
Comments for author File: Comments.pdf
The revised portions of the manuscript require grammatical corrections.
Author Response
- An analysis of the surface roughness was given, which discusses grinded surface and dressing wear. However, images of these surfaces are still absent from the manuscript. In fact, the whole discussion in Section 4.4 is out of context and is not supported by any visual evidence.
Response: Revised.Please check in line 482.
- The authors claim that the “effect of temperature on residual stress” has been added to the manuscript. The discussion is however missing. Experimental validation of the grinding temperature with respect to the theoretical value calculated in Eq. 1 must be given. Then, highlight how the changes in temperature would affect the changes in residual stresses (e.g., microstructural changes? Recrystallization effects? Etc.).
Response: Revised.Please check in line 464.
- The authors added the prescribed list of references to their reference list, but the in-text citation cannot be found! Please update the in-text citations properly. Moreover, the discussion on potential mechanochemical effects involved in the use of cutting fluids is not given. It is important to discuss this aspect as the mechanochemical effect has been shown to affect the material removal process and effect microstructural changes on machined surfaces. This comment does not ask for the “physical properties of the cutting fluid”. Read the prescribed literature carefully and add a proper discussion on the topic.
Response: Revised.Please check in line 59.
Author Response File: Author Response.pdf
Round 3
Reviewer 2 Report
1. The thsis of this paper is the low temperature cooling grinding, in the introduction, the author only writes that " Cryogenic cold air micro-lubrication (CMQL) technology is to atomize a small amount of grinding fluid and spray it into the grinding area through the nozzle under the impetus of high pressure cryogenic gas, so as to provide cooling and lubricating effect", this is just a simple explain on CMQL, thereis still no literatures review on the paper thsis, this problem has already been mentioned earlier.
2. The extensive language revision still is required, the technical term used in the paper should be unified such as, Flash Point and Ignition point.
3. For comparison, the Physical Properties that provided in the paper should be unified.
No
Author Response
1.The literature related to Cryogenic cold air micro-lubrication was compiled and reviewed. Many thanks to the reviewers. Please refer to line 52 in red.
2.This article has been revised using the MDPI language editing service. The technical terms used in the paper have been standardized. Please consult Tables 1 and 2.
3. Revised. Please consult Tables 1 and 2.
Reviewer 3 Report
Surface roughness measurements are given in Figure 22. Are these according to ISO standards? Why are the measurement lengths different between 7.27 and 4 mm? A proper comparison cannot be made if the sampling length is different. This is a red flag on the credibility of the results and discussion.
The authors are not responding appropriately to the comments given. Previous comment was to discuss "the effect of temperature on residual stress". But the authors' reply was simply, "Revised. Please check in line 464". Line 464 talks about an SEM image that shows a dark, transition, and base material. Where is the discussion in relation to "the effect of temperature on residual stress"???
In response to the reviewer's request to discuss potential influence of the mechanochemical effect with their lubrication, the reviewer is referred to check line 59. That is no discussion. If it is, it has to be substantially improved. What is the point that the authors are trying to direct with that paragraph? By claiming "... the mechanochemical effect plays a very important role.", how would that affect this whole study??
The quality of english is getting worse with the revisions. Major corrections are necessary to the language, preferably by a professional service.
Author Response
1. Thanks.
Roughness measurements were carried out in accordance with international ISO standards. The authors measured the roughness in both the axial and radial directions of the raceway with sampling lengths of 4 mm and 7.27 mm, respectively.
2. The effect of temperature on residual stresses is carefully discussed. Please refer to line 506 in red.
3. Mechanochemical effects on raceway surface integrity are summarized in detail in this paper. Please refer to line 70 in red.
Thanks
This article was revised using the MDPI language editing service.
Round 4
Reviewer 2 Report
all comments have been revised.
No
Author Response
The previous version of the draft has been modified using the MDPI editing service. The proof of editing service has been attached at the end of the article. Many thanks to the reviewers.
Reviewer 3 Report
State the specific ISO standard that was used for the roughness measurements.
Author Response
Revisions have been made. The section on ISO standards has been added, please refer to line 519. The sections on roughness measurement and roughness analysis have been renumbered. Please compare lines 514 and 542 in the text. Many thanks to the reviewers.
