Development of a Multi-Sensor Concept for Real-Time Temperature Measurement at the Cutting Insert of a Single-Lip Deep Hole Drilling Tool

Round 1

Reviewer 1 Report

The paper can be accepted for publication after minor correcting. Some issues are as below.

1. Some typos should be checked and corrected. For example, unit of feed in Table 5 should be mm/rev (not mm/U); page 8,line 214, "The temperature curve in Figure 7 is as follow" should be "The temperature curves in Figure 7 are as follow";  "When the heat is applied at about 25s" should be "When the heat is applied at about the 25th second"; 

2. The term "the inertia of the thermocouple" in page 15, line 338 should be explained clearer to avoid any miss-understanding;

3. The amount of difference between the calculated and experiment as about about 400 K to 500 K in page 17,line 388 should be discussed in more detail: what are the main reasons, how to correct it in practical application;

4. More discussion should be added for the value of optimized thermal convection of 139.3 - 313.8 when compared to several other values in literature shown in Table7.

 5. The conclusion section should give recommendation of how to apply the results obtained (thermal convection/ method of temperature measurement/ practical correction of the measured values... etc) for other studies in deep drilling.

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Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

This paper mainly studies the real-time measurement of cutting tooth temperature of single lip deep hole drill based on multi-sensor, and verifies and improves the measurement accuracy through the combination of simulation and experiment. This article is rich in content, but it needs a major revision according to the following comments:

1. the article mainly focuses on the modification and experimental research of simulation model parameters, and does not form a close combination with the multi-sensor mentioned in the topic. Is the topic appropriate?

2. in the introduction, there is too little introduction to sensor temperature measurement, and the emphasis is not in line with the research center of the article.

3. in Section 2.1, the blade is obviously not homogeneous after modification. How can we ensure that the heat conduction parameters measured in this section are the same at different temperatures?

4. the type of element mesh is not explained in the finite element model, which is very important to the accuracy of simulation results.

5. Is the tool rake angle and rake angle of the finite element model in Section 3.2 consistent with the actual cutting results?

6. why is the temperature change not seen on the tool in the model in Figure 9.

7. The clarity of Fig.7 needs to be improved, and the colors of curves in Fig.8 (a) are difficult to distinguish, such as T1 and T2.

8. In 3.1, what is the basis for adjusting the heat transfer coefficient？

9. In the whole research process of obtaining data through thermocouples and then conducting simulation analysis, the paper lacks the analysis of errors, including the position of the patch, the selection of parameters in the simulation calculation process, etc.

10. In the Introduction section of the paper, there is a lack of discussion on the process temperature or related research of deep hole drilling in recent years, which cannot highlight the author's understanding of the existing research.

11. The meaning of S1-S3 should be explained in the title of Figure 1, not just mentioned in the text.

Comments for author File: Comments.pdf

Author Response

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Author Response File: Author Response.pdf