Treatment method for catheter hole out-of-tolerance

Abstract

The invention relates to the technical field of cylinder cover conduit hole machining, in particular to a conduit hole out-of-tolerance processing method. The guide pipe hole out-of-tolerance treatment method comprises the following steps that S1, a guide sleeve is inspected, if the inner wall of the guide sleeve is abraded, the guide sleeve is replaced, then inspection is stopped, and a workpiece is started to be machined; otherwise, carrying out the next inspection; and S2, other parts, except for the gun drill, of the machining machine tool are inspected, corresponding parts are replaced or adjusted, inspection is stopped after the machining requirement is met, and workpiece machining is started. The guide sleeve has the greatest influence on the position precision of the reamer head of the reamer, so that the inner wall of the guide sleeve is firstly checked, namely, the maximum factor causing out-of-tolerance is firstly checked, and if the guide sleeve is abraded and is replaced in time, the factor causing out-of-tolerance with the greatest possibility is eliminated to a certain extent, so that the service life of the reamer is prolonged, and the service life of the reamer is prolonged. And the construction period can be prevented from being prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of cylinder head conduit hole processing, and in particular to a method for processing conduit hole out-of-tolerance. Background Art

[0002] During the machining of the cylinder head duct hole, the duct hole size sometimes exceeds the tolerance. On-site machining personnel usually believe that the deviation is caused by inaccurate machining parameters, so on-site workers adjust the machining parameters to solve the problem of duct hole size deviation. Especially when the workpiece machining volume is large and the construction period is tight, on-site workers adjust the machining parameters to solve the problem of duct hole size deviation, which is the most efficient solution.

[0003] Although adjusting the processing parameters can also avoid the deviation of the catheter hole, this method is actually just to correct the deviation caused by the real reason by adjusting the processing parameters, so the biggest cause of the deviation has not been eliminated, and the deviation of the catheter hole may still occur at any time. In addition, the on-site workers solve the deviation problem by adjusting the reamer feed speed. This adjustment method will accelerate the wear of the reamer, and the use of a worn reamer is more likely to cause the catheter hole to be out of tolerance, which will make the deviation problem more serious and difficult to handle. Therefore, it is possible to effectively ensure the processing quality and avoid extending the construction period by quickly finding the real deviation cause and eliminating it during the processing process. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that the actual cause of the deviation is not solved and the catheter hole may still be out of tolerance.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a method for processing an out-of-tolerance catheter hole. The processing machine tool includes a drill gun, a reamer and a cutting fluid supply mechanism. The gun drill is provided with a copper sleeve and a guide sleeve which are arranged parallel to and spaced apart along the same axis, and the reamer sleeve is connected to the copper sleeve and the guide sleeve; the cutting fluid supply mechanism provides cutting fluid for the reamer, wherein the method for processing an out-of-tolerance catheter hole includes the following steps: S1, inspecting the guide sleeve. If the inner wall of the guide sleeve is worn, the guide sleeve is replaced, and then the inspection is stopped and the workpiece is started to be processed; otherwise, the next inspection is performed; S2, inspecting other parts of the processing machine tool except the gun drill, and replacing or adjusting the corresponding parts. After the processing requirements are met, the inspection is stopped and the workpiece is started to be processed.

[0006] In some embodiments, step S1 further includes: if the guide sleeve is not worn, the copper sleeve is inspected; if the inner wall of the copper sleeve is worn, the copper sleeve is replaced, and then the inspection is stopped and processing is started; otherwise, the next item is inspected.

[0007] In some embodiments, step S2 further includes: checking the real-time flow rate of the cutting fluid, if the real-time flow rate is lower than the standard flow rate, increasing the supply of the cutting fluid, then stopping the check and starting to process the workpiece; otherwise, proceeding to the next check.

[0008] In some embodiments, if the real-time flow rate is equal to or higher than the standard flow rate, the lubricity of the cutting fluid is checked; if the lubricity of the cutting fluid is lower than the standard, the lubricity of the cutting fluid is adjusted to meet the standard, and then the check is stopped and processing is started; otherwise, the next check is performed.

[0009] In some embodiments, checking the lubricity of the cutting fluid further includes: determining whether the cutting fluid is stable; if the cutting fluid is a stable cutting fluid, checking the concentration of the cutting fluid, if the concentration of the cutting fluid does not meet the standard, adding sufficient cutting fluid stock to the cutting fluid to make the concentration of the cutting fluid meet the standard, then stopping the inspection and starting processing; otherwise, proceeding to the next inspection; if the cutting fluid is an unstable cutting fluid, taking part of the cutting fluid for tapping efficiency comparison, if the tapping efficiency of the cutting fluid does not meet the standard, adjusting the ratio of the components in the cutting fluid to make the concentration of the cutting fluid meet the standard, then stopping the inspection and starting processing; otherwise, proceeding to the next inspection.

[0010] In some embodiments, if the lubricity of the cutting fluid meets the standard, the smoothness of the chip groove of the reamer is checked. If the smoothness of the chip groove does not meet the standard, the surface of the chip groove is ground until it meets the standard, and then the inspection is stopped and processing is started; otherwise, the next inspection is carried out.

[0011] In some embodiments, the method for checking the smoothness of the chip groove includes: placing a thin and long silk strip in the chip groove, and then pulling the silk strip from the head end to the end of the chip groove. If a scratching delay is felt during the pulling of the silk strip, it means that the smoothness of the chip groove is insufficient. Then, apply abrasive paste to the chip groove and wipe the chip groove repeatedly until the smoothness of the chip groove meets the standard.

[0012] In some embodiments, if the finish of the chip flute of the reamer meets the standard, the width of the chip flute of the reamer is checked; if the width of the chip flute does not meet the standard, the reamer is replaced, and then the inspection is stopped and the machining is started.

[0013] The technical solution of the present invention has the following beneficial effects:

[0014] After research, the inventor of the present invention found that the position accuracy of the reamer's blade head is the factor that is most likely to cause the catheter hole to be out of tolerance, and the guide sleeve has the greatest impact on the position accuracy of the reamer's blade head. Therefore, the inner wall of the guide sleeve is checked first, that is, the biggest factor causing the out-of-tolerance is checked first. If the guide sleeve is worn and replaced in time, it means that the most likely factor causing the out-of-tolerance has been eliminated to a certain extent, and the site can be put into production as soon as possible to avoid extended construction period; if the guide sleeve is not worn, the most likely cause of the out-of-tolerance is quickly eliminated, and other aspects can be continued to be checked, which greatly narrows the scope of investigation and helps to quickly find the biggest inducement to the out-of-tolerance and avoid extended construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic flow chart of a method for processing pipe hole tolerance in one embodiment of the present invention;

[0016] Figure 2 It is a schematic diagram of a reamer installed on a drill gun in one embodiment of the present invention.

[0017] Description of reference numerals:

[0018] 1. Reamer; 2. Guide sleeve; 3. Copper sleeve; 4. Mandrel. DETAILED DESCRIPTION

[0019] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention, rather than to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0020] It should be noted that the cylinder head conduit hole is processed by a processing machine tool, which includes a drill, a reamer 1 and a cutting fluid supply mechanism. Figure 2As shown, the gun drill further includes a copper sleeve 3 and a guide sleeve 2 which are arranged parallel and spaced along the same axis, and the reamer 1 is sleeved in the copper sleeve 3 and the guide sleeve 2. The copper sleeve 3 and the guide sleeve 2 are respectively connected to the main shaft of the gun drill, and a mandrel 4 is sleeved in the copper sleeve 3, one end of the mandrel 4 is connected to the end of the reamer 1, and the other end of the mandrel 4 is connected to the main shaft. Since the on-site processing personnel usually believe that the out-of-tolerance situation is caused by the inaccurate setting of the processing parameters, the on-site staff solves the problem of the out-of-tolerance of the catheter hole size by adjusting the processing parameters such as the feed speed of the reamer 1, the feed amount of the reamer 1, or the processing allowance of the reamer 1. However, this method actually only corrects the out-of-tolerance caused by the real reason by adjusting the processing parameters, so the biggest inducement of the out-of-tolerance has not been eliminated, and the out-of-tolerance situation of the catheter hole may still occur at any time. Of course, the processing machine tool used for processing the catheter hole is a conventional equipment in this field, and the specific structure of the present invention will not be repeated.

[0021] like Figure 1 As shown, the present invention provides a method for processing an out-of-tolerance catheter hole. The method for processing an out-of-tolerance catheter hole comprises the following steps: S1, inspecting the guide sleeve 2, if the inner wall of the guide sleeve 2 is worn, replacing the guide sleeve 2, then stopping the inspection and starting to process the workpiece; otherwise, proceeding to the next inspection; S2, inspecting the other parts of the processing machine tool except the gun drill, and replacing or adjusting the corresponding parts, and stopping the inspection and starting to process the workpiece after the processing requirements are met.

[0022] Specifically, the catheter hole is directly processed by the reamer 1, so the position accuracy of the reamer 1 is most likely to directly affect the processing results. The reamer 1 further includes a cutter head and a shank, and the cutter head is the part that bears the function of cutting the workpiece, so relative to the shank, the poor position accuracy of the cutter head is more likely to cause the catheter hole to be out of tolerance. The middle section of the reamer 1 is sleeved in the guide sleeve 2, and the cutter head extends from the guide sleeve 2. The reamer 1 and the guide sleeve 2 rotate in the same direction and at the same speed, so the guide sleeve 2 is the most likely to affect the cutter head. According to the inventor's observation, if the guide sleeve 2 is worn inside, the center of gravity of the guide sleeve 2 will be offset, and the center of gravity of the guide sleeve 2 will no longer be located on the axis of the guide sleeve 2. Therefore, when the guide sleeve 2 rotates at high speed, it will vibrate and jump, causing the inner wall of the guide sleeve 2 to repeatedly squeeze the reamer 1, thereby causing the reamer 1 to deviate from the standard operating range, and ultimately causing the catheter hole to be out of tolerance. However, since the inner diameter of the guide sleeve 2 is relatively small and the gap between the reamer 1 and the guide sleeve 2 is extremely small, when the guide sleeve 2 is stationary, the wear in the guide sleeve 2 is not easily observed directly by the naked eye; and when the guide sleeve 2 rotates at high speed, the vibration and jumping of the guide sleeve 2 are even more difficult to be found, so these problems are easily ignored by on-site processing personnel. Therefore, based on the above-mentioned production practice, when an out-of-tolerance problem occurs, the top priority should be to check whether the inner wall of the guide sleeve 2 is worn. If the guide sleeve 2 is worn, replace the worn guide sleeve 2 with a new guide sleeve 2, then stop checking and continue processing and production. The way to check the guide sleeve 2 can be to use a conventional three-coordinate measuring instrument in the field for rapid measurement, but the present invention does not elaborate on the on-site detection process.

[0023] In this embodiment, the inventor of the present invention has found after research that the position accuracy of the blade head of the reamer 1 is the factor that is most likely to cause the catheter hole to be out of tolerance, and the guide sleeve 2 has the greatest impact on the position accuracy of the blade head of the reamer 1, so the inner wall of the guide sleeve 2 is checked first, that is, the biggest factor causing the out of tolerance is checked first. If the guide sleeve 2 is worn and replaced in time, it means that the most likely factor causing the out of tolerance has been eliminated to a certain extent, and the site can be put into production as soon as possible to avoid extended construction period; if the guide sleeve 2 is not worn, the most likely cause of the out of tolerance is quickly eliminated, and other aspects can be continued to be checked, which greatly narrows the scope of investigation and helps to quickly find the biggest inducement to the out of tolerance and avoid extended construction period.

[0024] In some embodiments of the present invention, step S1 further includes: if the guide sleeve 2 is not worn, the copper sleeve 3 is inspected; if the inner wall of the copper sleeve 3 is worn, the copper sleeve 3 is replaced, and then the inspection is stopped and processing is started; otherwise, the next item is inspected.

[0025] Specifically, since the position accuracy of the reamer 1 is most likely to affect the direct processing structure, if the guide sleeve 2 is not worn, that is, the position accuracy of the front section of the reamer 1 is up to standard, then the shank of the reamer 1 is most likely to have problems. The shank of the reamer 1 is located in the copper sleeve 3, and the shank of the reamer 1 is connected to the mandrel 4. The copper sleeve 3 is sleeved on the outside of the mandrel 4. The copper sleeve 3 and the mandrel 4 are respectively connected to the main shaft of the drill gun. The main shaft drives the copper sleeve 3, the mandrel 4 and the reamer 1 to rotate in the same direction, and the mandrel 4 moves along the copper sleeve 3, thereby driving the reamer 1 to move along the guide sleeve 2. Therefore, the most likely reason for the position accuracy problem of the shank is the wear of the inner wall of the copper sleeve 3. After the inner wall of the copper sleeve 3 is worn, the center of gravity of the copper sleeve 3 will be offset, and the center of gravity of the copper sleeve 3 is no longer located on the axis line of the copper sleeve 3, so when the copper sleeve 3 is rotated at high speed, it will vibrate and jump, causing the inner wall of the copper sleeve 3 to repeatedly squeeze the feed shaft 4, thereby causing the reamer 1 to deviate from the standard operating range, and finally causing the catheter hole to be out of tolerance. Since the copper sleeve 3 is installed in the gun drill, the position is relatively hidden, and the problem of the copper sleeve 3 is difficult to be detected by the on-site processing workers. However, in combination with the production practice of the inventor, when the out-of-tolerance problem occurs, after determining that the guide sleeve 2 meets the standard, it should be preferred to check whether the copper sleeve 3 is worn. If the copper sleeve 3 is worn, replace the worn copper sleeve 3 with a new copper sleeve 3, then stop checking and continue processing and production. Since the inner diameter of the copper sleeve 3 is large, it can be directly checked by naked eye observation or finger touch to check whether the copper sleeve 3 is worn, or it can be accurately measured by a three-coordinate measuring instrument. The present invention is not limited, but the present invention does not repeat the on-site detection process.

[0026] In this embodiment, the copper sleeve 3 is the factor that has the greatest impact on the position accuracy of the tool handle, so the inspection of the copper sleeve 3 is the second priority. If the copper sleeve 3 is worn and replaced in time, it means that the biggest cause of the deviation has been solved to some extent, and the site can be put into production as soon as possible to avoid extended construction period; if the copper sleeve 3 is not worn, the factor of the gun drill itself is quickly ruled out, and other aspects of the gun drill can be checked, which greatly narrows the scope of investigation, helps to quickly find the biggest cause of the deviation and avoid extended construction period.

[0027] In some embodiments of the present invention, step S2 further includes: checking the real-time flow rate of the cutting fluid, if the real-time flow rate is lower than the standard flow rate, increasing the supply of the cutting fluid, then stopping the check and starting to process the workpiece; otherwise, proceeding to the next check.

[0028] Specifically, if the guide sleeve 2 and the copper sleeve 3 are not worn, it means that the position accuracy of the reamer 1 is qualified, then the most likely cause of the deviation is that the friction of the reamer 1 is large during the cutting process. The supply of cutting fluid is the factor that has the greatest impact on the cutting friction. If the cutting fluid is not supplied in sufficient quantity, the friction resistance of the reamer 1 during the cutting process is large, which increases the cutting force of the reamer 1 and increases the probability of thermal deformation of the catheter hole. Therefore, in combination with the production practice of the inventor, when the position accuracy of the reamer 1 is up to standard, the flow rate of the cutting fluid should be checked first. Of course, the real-time flow rate of the cutting fluid can be observed and recorded by the flow meter on the processing machine tool or the cutting fluid supply mechanism. If the real-time flow rate is lower than the standard flow rate, it means that the supply of the cutting fluid is insufficient, and the supply should be increased. Then, the inspection should be stopped and the processing and production can be continued.

[0029] In this embodiment, checking the cutting fluid flow rate is also helpful in finding out the biggest cause of the deviation.

[0030] In some embodiments of the present invention, if the real-time flow rate is equal to or higher than the standard flow rate, the lubricity of the cutting fluid is checked; if the lubricity of the cutting fluid is lower than the standard, the lubricity of the cutting fluid is adjusted to meet the standard, and then the check is stopped and processing is started; otherwise, the next check is performed.

[0031] Specifically, since the same batch of cutting fluid is usually used when processing a batch of workpieces, the quality of the cutting fluid is relatively stable during the entire processing process. Even if the lubricity provided by the cutting fluid is insufficient, the lubricity can usually be improved by increasing the supply of the cutting fluid. However, if increasing the cutting fluid flow rate cannot solve the problem of out-of-tolerance, it means that the quality of the cutting fluid is unqualified, resulting in the lubricity of the cutting fluid being lower than the standard lubricity. Therefore, in combination with the inventor's production practice, when the real-time flow rate of the cutting fluid meets the standard, the lubricity of the cutting fluid should be checked as a priority.

[0032] In this embodiment, checking the lubricity of the cutting fluid is also helpful in finding out the biggest cause of the deviation.

[0033] In some embodiments of the present invention, checking the lubricity of the cutting fluid further includes: determining whether the cutting fluid is stable; if the cutting fluid is a stable cutting fluid, checking the concentration of the cutting fluid, if the concentration of the cutting fluid does not meet the standard, adding a sufficient amount of cutting fluid stock solution to the cutting fluid to make the concentration of the cutting fluid meet the standard, then stopping the inspection and starting processing; otherwise, proceeding to the next inspection; if the cutting fluid is an unstable cutting fluid, taking part of the cutting fluid for tapping efficiency comparison, if the tapping efficiency of the cutting fluid does not meet the standard, adjusting the ratio of the components in the cutting fluid to make the concentration of the cutting fluid meet the standard, then stopping the inspection and starting processing; otherwise, proceeding to the next inspection.

[0034] Specifically, the quality of cutting fluids from different batches and different manufacturers may be different. Whether the cutting fluid is stable can be directly judged by visual observation. The components in the cutting fluid with good stability are well mixed, the emulsification degree of the cutting fluid with good stability is good, and the concentration consistency is good (that is, no stratification phenomenon occurs); while the components in the cutting fluid with poor stability are poorly mixed, and the stratification phenomenon of the components will occur, and its concentration consistency is poor. For cutting fluids that meet the stability standards, samples of the cutting fluid are collected, and then the concentration of the cutting fluid can be tested by a titration test device or a refractometry test device. If the concentration test fails, the cutting fluid stock solution is directly added to the cutting fluid to increase the concentration of the effective components in the cutting fluid. For cutting fluids with poor stability, the concentration of this type of cutting fluid is inconsistent, so the concentration is not directly tested. At this time, a certain amount of cutting fluid can be extracted, and the cutting fluid sample can be supplied to a tapping torque tester or a lubricant extreme pressure performance determination instrument (four-ball grinder) for use, and the tapping efficiency of the above-mentioned testing machine when using the cutting fluid for tapping processing is detected, and then the tapping efficiency is compared with the tapping efficiency of the standard cutting fluid under the same processing conditions. If the tapping efficiency of the cutting fluid is lower than that of the standard cutting fluid, it means that the concentration of the cutting fluid is unqualified. For such unqualified cutting fluid with poor stability, the problem can be solved by re-adjusting the effective component ratio or directly replacing the qualified cutting fluid. Those skilled in the art can make flexible choices.

[0035] In some embodiments of the present invention, if the lubricity of the cutting fluid meets the standard, the smoothness of the chip groove of the reamer 1 is checked. If the smoothness of the chip groove does not meet the standard, the surface of the chip groove is ground until it meets the standard, and then the inspection is stopped and processing is started; otherwise, the next inspection is performed.

[0036] Specifically, if the flow rate and concentration of the cutting fluid meet the standards, the factor most likely to cause the deviation is the chip removal quality. During the machining process, in most cases, the high-speed flowing cutting fluid will impact the chip groove, thereby flushing the iron chips out of the chip groove. Therefore, compared with checking the flow rate and lubricity of the cutting fluid, checking the chip groove has a lower priority. When the finish of the chip groove is insufficient, sometimes the iron chips in the chip groove cannot be discharged in time, and the iron chips are clogged in the chip groove and squeeze the duct hole, thereby causing the duct hole to exceed the tolerance. Combined with the production practice of the inventor, when the flow rate and lubricity of the cutting fluid meet the standards, the finish of the chip groove is checked first. The way to check the finish of the chip groove can be to use the silk detection method to detect the finish of the chip groove. For example, a thin and long silk strip is placed in the chip groove, and then the silk strip is pulled from the head end to the end of the chip groove. If a scratching hysteresis is felt during the pulling of the silk strip, it indicates that the chip groove is not smooth enough. Then, abrasive paste is applied to the chip groove, and the surface of the chip groove is repeatedly wiped until the chip groove is smooth enough. If the silk strip is pulled very smoothly, it indicates that there is no problem with the smoothness of the chip groove. Of course, other methods can also be used to check the smoothness of the chip groove, and the present invention is not limited thereto.

[0037] In this example, checking the finish of the chip flutes also helps to identify the biggest cause of the out-of-tolerance.

[0038] In some embodiments of the present invention, if the finish of the chip groove of the reamer 1 meets the standard, the width of the chip groove of the reamer 1 is checked. If the width of the chip groove does not meet the standard, the reamer 1 is replaced, and then the inspection is stopped and processing is started.

[0039] Specifically, if there is no problem with the finish of the chip groove, then the main reason affecting chip removal may be that the width of the chip groove is too small. Sometimes a small number of reamers 1 may have defects or the design of the reamer 1 itself is unreasonable, which makes the width of the chip groove too small, causing iron chips to be blocked in the chip groove because they cannot be discharged in time. Therefore, compared with checking the finish of the chip groove, checking the chip groove has a lower priority. When checking the width of the chip groove, remove the reamer 1, then cut the reamer 1 along the radial direction, and then compare the cross-section of the reamer 1 with the cross-section of the standard reamer. If the width of the chip groove in the cross-section of the reamer 1 is obviously smaller, it means that the reason for the deviation is that the width of the chip groove is too small. Of course, if the width of the chip groove is small, it can be replaced with a reamer 1 from another manufacturer or batch.

[0040] Table 1 is a statistics of the causes of catheter hole out-of-tolerance in the production practice by the inventor. The table records and summarizes the causes of catheter hole out-of-tolerance from 2019 to 2022, and sorts the causes of out-of-tolerance in previous years according to the number of occurrences.

[0041] Table 1

[0042]

[0043] It can be seen from Table 1 that during the period from 2019 to 2022, the reasons for the deviation from tolerance are ranked according to the number of occurrences, namely, inner wall wear of the guide sleeve, inner wall wear of the copper sleeve, real-time flow rate of the cutting fluid lower than the standard flow rate, insufficient lubrication of the cutting fluid, insufficient finish of the chip groove of the reamer, and substandard chip groove width of the reamer. Among them, the number of occurrences of the three reasons of guide sleeve wear, copper sleeve wear and small cutting fluid flow rate is much higher than that of other reasons, and the number of occurrences of guide sleeve wear is much higher than that of copper sleeve wear and small cutting fluid flow rate. Therefore, when the guide hole is out of tolerance during emergency processing, the inner wall of the guide sleeve 2 can be checked first, that is, the biggest factor causing the deviation from tolerance can be checked first. If the guide sleeve 2 is worn and replaced in time, it means that the most likely factor causing the deviation from tolerance has been eliminated to some extent, and the site can be put into production as soon as possible to avoid extension of the construction period. If the guide sleeve 2 is not worn, the most likely cause of the deviation is quickly eliminated, and other aspects can be checked in turn, gradually narrowing the scope of investigation, which helps to quickly find the biggest cause of the deviation and avoid extending the construction period. This treatment method can effectively ensure the processing quality and avoid repeated deviations; it can also effectively avoid abnormal wear of the reamer 1 during emergency processing, thereby preventing the deviation problem from becoming more serious and difficult to handle.

[0044] It should be noted that the present invention is proposed under the condition of short processing period or tight construction period. Due to time constraints, on-site personnel are not in a position to conduct a comprehensive inspection of the processing machine tools. Based on production experience, the inventor proposes to check the causes of out-of-tolerance according to the probability of occurrence of various factors. As long as one of the causes is checked first in order and solved accordingly, the out-of-tolerance problem is solved to a certain extent, and processing and production can be resumed immediately, which helps to speed up processing efficiency and avoid extension of construction period. Moreover, since the real cause of out-of-tolerance is eliminated, there is no need to make substantial adjustments to the production parameters, which effectively guarantees the processing quality and avoids repeated out-of-tolerance.

[0045] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above are only preferred implementation methods of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the present invention to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A method for processing an out-of-tolerance catheter hole, wherein a machine tool for processing the catheter hole comprises a drill gun, a reamer and a cutting fluid supply mechanism, wherein the gun drill is provided with a copper sleeve and a guide sleeve arranged parallel to and spaced apart from each other along the same axis, and the reamer is sleeved in the copper sleeve and the guide sleeve; the cutting fluid supply mechanism provides cutting fluid for the reamer, wherein: The method for processing the catheter hole out-of-tolerance comprises the following steps: S1, inspect the guide sleeve. If the inner wall of the guide sleeve is worn, replace the guide sleeve, then stop the inspection and start processing the workpiece; otherwise, proceed to the next inspection; S2. Inspect the other parts of the processing machine tool except the gun drill, and replace or adjust the corresponding parts. After the processing requirements are met, stop the inspection and start processing the workpiece.

2. The method for processing the catheter hole out-of-tolerance according to claim 1, characterized in that: The step S1 further includes: if the guide sleeve is not worn, the copper sleeve is inspected; if the inner wall of the copper sleeve is worn, the copper sleeve is replaced, and then the inspection is stopped and processing is started; otherwise, the next item is inspected.

3. The method for processing the catheter hole out-of-tolerance according to claim 2, characterized in that: The step S2 further comprises: The real-time flow rate of the cutting fluid is checked. If the real-time flow rate is lower than the standard flow rate, the supply of the cutting fluid is increased, and then the check is stopped and the workpiece is started to be processed; otherwise, the next check is carried out.

4. The method for processing the catheter hole out-of-tolerance according to claim 3, characterized in that: If the real-time flow rate is equal to or higher than the standard flow rate, the lubricity of the cutting fluid is checked; if the lubricity of the cutting fluid is lower than the standard, the lubricity of the cutting fluid is adjusted to meet the standard, and then the check is stopped and processing is started; otherwise, the next check is performed.

5. The method for processing the catheter hole out-of-tolerance according to claim 4, characterized in that: Checking the lubricity of the cutting fluid further comprises: Determining whether the cutting fluid is stable; If the cutting fluid is a stable cutting fluid, the concentration of the cutting fluid is checked. If the concentration of the cutting fluid does not meet the standard, sufficient cutting fluid stock solution is added to the cutting fluid to make the concentration of the cutting fluid meet the standard, and then the inspection is stopped and the processing is started; otherwise, the next inspection is carried out; If the cutting fluid is a non-stable cutting fluid, take part of the cutting fluid for tapping efficiency comparison. If the tapping efficiency of the cutting fluid does not meet the standard, adjust the ratio of the components in the cutting fluid to make the concentration of the cutting fluid meet the standard, then stop the inspection and start processing; otherwise, proceed to the next inspection.

6. The method for processing the catheter hole out-of-tolerance according to claim 4 or 5, characterized in that: If the lubricity of the cutting fluid meets the standard, the smoothness of the chip groove of the reamer is checked. If the smoothness of the chip groove does not meet the standard, the surface of the chip groove is ground until it meets the standard, and then the inspection is stopped and processing is started; otherwise, the next inspection is carried out.

7. The method for processing excessive tolerance of catheter holes according to claim 6, characterized in that: The method for inspecting the finish of the chip groove includes: Place a long and thin silk strip in the chip groove, and then pull the silk strip from the head end to the end of the chip groove. If a scratching delay is felt during the pulling of the silk strip, it means that the smoothness of the chip groove is insufficient. Then apply abrasive paste to the chip groove and wipe the surface of the chip groove repeatedly until the smoothness of the chip groove meets the standard.

8. The method for processing catheter hole out-of-tolerance according to claim 6, characterized in that: If the finish of the chip groove of the reamer is up to standard, the width of the chip groove of the reamer is checked. If the width of the chip groove is not up to standard, the reamer is replaced, and then the inspection is stopped and the processing is started.

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