CN117816847A - Method for compensating rolling inner diameter of guide pipe - Google Patents

Method for compensating rolling inner diameter of guide pipe Download PDF

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Publication number
CN117816847A
CN117816847A CN202210812811.6A CN202210812811A CN117816847A CN 117816847 A CN117816847 A CN 117816847A CN 202210812811 A CN202210812811 A CN 202210812811A CN 117816847 A CN117816847 A CN 117816847A
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CN
China
Prior art keywords
catheter
rolling
conduit
wall thickness
actual
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CN202210812811.6A
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Chinese (zh)
Inventor
赵东生
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Suzhou Huida Yunyi Aviation Technology Co ltd
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Suzhou Huida Yunyi Aviation Technology Co ltd
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Publication of CN117816847A publication Critical patent/CN117816847A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
    • B21D39/046—Connecting tubes to tube-like fittings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/92—Making other particular articles other parts for aircraft

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Media Introduction/Drainage Providing Device (AREA)

Abstract

The invention discloses a catheter rolling inner diameter compensation method, which comprises the steps of obtaining a catheter to be rolled, obtaining a theoretical wall thickness of the catheter, a theoretical inner diameter of a joint and a theoretical outer diameter of the catheter, which are required to be obtained after the catheter is rolled, and calculating to obtain a theoretical inner diameter value of the catheter after the catheter is rolled; according to the theoretical wall thickness of the conduit and the conduit material, the required conduit wall thickness corresponding to the conduit made of the material is prepared, and the conduit wall thickness rolling flow change value C under the preset rolling torque is obtained; the following parameters of the actual catheter to be rolled are measured: the actual wall thickness of the catheter, the actual outer diameter of the catheter and the actual inner diameter of the sleeve; and calculating to obtain the actual inner diameter value of the catheter after rolling. The method for compensating the rolling inner diameter of the catheter improves the actual inner diameter value D after the catheter is rolled s The precision of (2) can be further obtained, so as to ensure the dimensional precision of the conduit obtained by rolling, ensure that the conduit has better sealing performance during working, and finally improve the safety use performance of the aircraft.

Description

Method for compensating rolling inner diameter of guide pipe
Technical Field
The invention relates to the technical field of conduit rolling, in particular to a conduit rolling inner diameter compensation method.
Background
The aviation hydraulic flaring-free catheter is a detachable catheter which is formed by connecting a catheter and a sleeve in a rolling way and then connecting the sleeve with a connector with a 24-degree conical surface to ensure the connection and sealing of the catheter. Compared with the traditional flaring connection form, the flaring connection form has better performance in various use environments of the airplane.
The aviation hydraulic flaring-free catheter is characterized in that the catheter and the sleeve are subjected to plastic deformation through torque provided by rolling equipment, and are extruded into a notch of the sleeve to achieve permanent connection. In the process of rolling the catheter assembly, in order to ensure that the catheter rolling process meets the design and use requirements, whether the inner diameter value of the rolled catheter meets the requirements or not is checked.
In the actual rolling and checking process, the rolled inner diameter value can meet the requirement of a design value (fixed value), but the delivered catheter assembly often has the leakage problem in the use process because the influence of the changing factors such as the wall thickness of the catheter, the tolerance of the outer diameter of the catheter and the like which are purchased in practice is not considered, so that the hydraulic system of the airplane has great potential safety hazard.
The invention aims to solve the technical problem of improving the inner diameter value of the rolled guide pipe under the condition of considering the influence of the variation factors such as the wall thickness of the guide pipe, the tolerance of the outer diameter of the guide pipe and the like which are purchased actually, thereby improving the safety performance of an airplane hydraulic system.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a compensation formula aiming at the variation factors such as the wall thickness of the catheter, the tolerance of the outer diameter of the catheter and the like, and the actual inner diameter value D of the catheter after rolling is obtained according to the influence correction of the wall thickness variation of the catheter, the outer diameter variation of the catheter and the rolling torque reference value s The actual inside diameter value D s After calculation, the torque value is further used for adjusting the rolling torque value during the rolling of the guide pipe, so that the optimal rolling torque value can be calculated to roll the guide pipe no matter how the wall thickness and the outer diameter of the guide pipe change, thereby solving the problem of inaccurate rolling torque and completely meeting the requirement of the rolling of the guide pipeThe design and the use requirements, and simultaneously, the pipe rolling inner diameter compensation method greatly improves the qualification rate of pipe rolling products.
The technical scheme adopted by the invention is as follows:
a method for compensating the rolling inner diameter of a catheter,
obtaining the theoretical wall thickness delta of the conduit required to be rolled after the conduit is rolled 0 Theoretical inner diameter D of joint jo And theoretical outer diameter D of catheter to And calculating to obtain theoretical inner diameter value D of catheter after rolling so ；
The theoretical wall thickness delta of the conduit obtained according to the last step 0 And the conduit material, the conduit wall thickness that the conduit of the material made corresponds to is called, the conduit wall thickness rolling flow change value C under the predetermined rolling torque;
the following parameters of the actual catheter to be rolled are measured: actual wall thickness delta of conduit and actual outer diameter D of conduit t Actual inner diameter D of sleeve j ；
Calculating to obtain the actual inner diameter value D of the catheter after rolling s :
D s ＝D so +2(δ 0 -δ)+(D j -D j0 )+(D t -D to )-C。
Further, the rolling flow variation value C of the wall thickness of the conduit under the preset rolling torque is obtained according to the following steps: s1, acquiring a material conduit, and measuring the thickness delta of the conduit aiming at the conduit with the same thickness Front part Rolling the catheter with the same rolling torque;
s2, cutting the rolled catheter, and measuring the thickness delta of the catheter Rear part (S) Calculating a rolling flow change value C of the wall thickness of the catheter:
C＝δ rear part (S) -δ Front part ；
S3, recording the material conduit: material properties, thickness and rolling torque, and the conduit wall thickness rolling flow variation value C at that thickness.
The step of rolling the flow variation value C of the wall thickness of the conduit under the preset rolling torque, further comprises the following steps:
s4, repeating the steps at least once to obtain a rolling flow change value C of the wall thickness of the catheter with the same material property, thickness and rolling torque;
s5, calculating the average value series of the rolling flow change value C of the wall thickness of the catheter.
Further, repeating the steps S1-S5 to obtain the rolling flow change value C of the wall thickness of the conduit when the rolling torque is different for different materials, so as to form the standard value of the rolling flow change value C of the wall thickness of the conduit when the wall thickness of each material is different and the rolling torque is different.
Further, theoretical inner diameter value D after rolling of the catheter so The calculation formula is as follows:
D so ＝＝D j0 +2m-2δ o
wherein: m-depth of notch in inner wall of catheter.
Further, the number of measurements of the actual wall thickness δ of the catheter is 3 or more.
Further, the actual outer diameter D of the catheter t Actual inner diameter D of sleeve j In the measurement, the number of measurements is 2-5.
Further, the actual wall thickness delta of the conduit and the actual outer diameter D of the conduit t Actual inner diameter D of sleeve j The respective several measurements are arranged uniformly in the circumferential direction of the catheter wall.
Further, the actual inner diameter D of the rolled tube sleeve j The measurement point of (2) is the center position of the third notch of the notch at the position of the sealing surface of the tube sleeve, which is far away from the tube sleeve.
Compared with the prior art, the invention has the beneficial effects that:
1. the actual inner diameter value D is improved s Is of the accuracy of:
according to the theoretical value of the conduit to be rolled: theoretical wall thickness delta of conduit 0 Theoretical inner diameter D of joint jo And theoretical outer diameter D of catheter to Calculating the theoretical inner diameter value D of the catheter after rolling according to the existing calculation method so And then according to the theoretical wall thickness delta of the catheter obtained in the last step 0 And catheter material, the catheter wall thickness of the catheter corresponding to the required catheter wall thickness of the catheter made of the material is taken, and the catheter wall thickness under the preset rolling torque is takenThe rolling flow change value C is used for simultaneously measuring the actual wall thickness delta of the conduit and the actual outer diameter D of the conduit t Actual inner diameter D of sleeve j Fully considers and quantifies the influences of the wall thickness change of the conduit, the outer diameter change of the conduit and the rolling torque reference value, and corrects the obtained actual inner diameter value D of the conduit after rolling s Thereby improving the actual inner diameter value D of the catheter after rolling s The precision of the guide pipe obtained by rolling is ensured, the good sealing performance of the guide pipe is ensured during working, and the safety use performance of the aircraft is finally improved.
2. The rolling torque accuracy in the process of rolling the catheter is improved:
the actual inside diameter value D s After calculation, the actual internal diameter D is further corrected by substituting the actual internal diameter D into a rolling torque calculation formula to calculate a rolling torque value s The torque value used for adjusting the rolling processing of the guide pipe during rolling can calculate the optimal rolling torque value to roll the guide pipe no matter how the wall thickness and the outer diameter of the guide pipe change, thereby solving the problem of inaccurate rolling torque.
The pipe rolling inner diameter compensation method of the invention increases the correction of rolling torque variation caused by the wall thickness variation of the variable pipe and the outer diameter variation of the pipe in the pipe rolling process, eliminates the torque uncertainty factor in the flaring-free rolling process, realizes the accurate rolling of the hydraulic flaring-free connection technology, thereby improving the actual inner diameter value D after the pipe rolling s The precision of (2) can be further obtained, so as to ensure the dimensional precision of the conduit obtained by rolling, ensure that the conduit has better sealing performance during working, and finally improve the safety use performance of the aircraft.
Drawings
FIG. 1 is a flow chart of a method of compensating for the rolling inner diameter of a catheter;
FIG. 2 is a flow chart of the calculation of the rolling flow variation value C of the wall thickness of the conduit;
FIG. 3 is a diagram showing the connection structure of a catheter and a sleeve;
wherein: 1-catheter, 2-sleeve, 21-sleeve sealing surface, 22-third notch, 23-center position.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the indicated combinations or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. In addition, in the description process of the embodiment of the present invention, the positional relationships of the devices such as "upper", "lower", "front", "rear", "left" and "right" in all the figures are all standardized in fig. 1.
As shown in fig. 1, a flow chart of a method of compensating for a rolling inner diameter of a catheter,
step S10, obtaining the conduit to be rolled, the theoretical wall thickness delta of the conduit and the theoretical inner diameter D of the joint, which are required to be obtained after the conduit is rolled jo And theoretical outer diameter D of catheter to And calculating to obtain theoretical inner diameter value D of catheter after rolling in step S20 so ；
The following parameters of the actual catheter to be rolled are measured as in step S40: the actual wall thickness delta of the catheter; actual outer diameter D of catheter t ；
Practical inner diameter D of sleeve j。
Step S30, according to the theoretical wall thickness delta of the conduit and the conduit material obtained in the last step, the required conduit wall thickness corresponding to the conduit made of the material is prepared, and the conduit wall thickness rolling flow change value C under the preset rolling torque is obtained;
the following parameters of the actual catheter to be rolled 1 were measured: actual wall thickness delta of conduit and actual outer diameter D of conduit t Pipe and tubePractical inner diameter D of sleeve j ；
The detail is seen in step S50 to calculate the actual inner diameter value D of the catheter after rolling s :
D s ＝D so +2(δ 0 -δ)+(D j -D j0 )+(D t -D to )-C。
In a more preferred embodiment, in the calculation process of the compensation method, as shown in fig. 2, the rolling flow variation value C of the wall thickness of the conduit under the predetermined rolling torque is obtained according to the following steps:
s1, acquiring a material conduit, and measuring the thickness delta of the conduit aiming at the conduit with the same thickness Front part Rolling the catheter with the same rolling torque;
s2, cutting the rolled catheter, and measuring the thickness delta of the catheter Rear part (S) Calculating a rolling flow change value C of the wall thickness of the catheter:
C＝δ rear part (S) -δ Front part ；
δ Front part Thickness of the tube before rolling, delta Rear part (S) -cutting the rolled catheter thickness;
s3, recording the material conduit: material properties, thickness and rolling torque, and the conduit wall thickness rolling flow variation value C at that thickness.
The step of rolling the flow variation value C of the wall thickness of the conduit under the preset rolling torque, further comprises the following steps:
s4, repeating the steps at least once to obtain a rolling flow change value C of the wall thickness of the catheter with the same material property, thickness and rolling torque;
s5, calculating the average value of the rolling flow change value C of the wall thickness of the catheter;
the steps can be carried out before the mass production of the conduit with each material type and wall thickness, or can be carried out in batch to obtain the stable conduit wall thickness rolling flow change value C standard value which is supplied for later use.
In a more preferred embodiment, the steps S1-S5 are repeated to obtain the rolling flow change value C of the wall thickness of the conduit when the rolling torque is different for different materials, so as to form the standard value of the rolling flow change value C of the wall thickness of the conduit when each material is different in wall thickness and different in rolling torque, the conduit is directly inquired for use when the conduit is subsequently rolled, the conduit rolling inner diameter compensation can be better promoted, the conduit to be rolled is required in the later stage, the standard value of the rolling flow change value C of the wall thickness of the conduit can be inquired only by providing the material, the thickness and the rolling torque to be used of the conduit, and the period and the cost for measuring the conduit by performing a plurality of tests in advance when the conduit is rolled are omitted.
In a more preferred embodiment, the theoretical inner diameter value Dso after the rolling of the catheter is calculated as:
D so ＝＝D j0 +2m-2δ o
wherein: m-depth of notch in inner wall of catheter.
The number of measurements of the actual wall thickness delta of the conduit is 3 or more, and then the average value series of all the measured data is taken to determine the value of the actual wall thickness delta of the conduit, and then the actual inner diameter D of the conduit after rolling is supplied s And (5) calculating and using.
More preferably, the actual outer diameter D of the catheter t Actual inner diameter D of sleeve j During measurement, the number of measurement times is 2-5 times, and the actual outer diameter D of the catheter can be well determined t Actual inner diameter D of sleeve j Is then fed to the actual internal diameter D of the catheter after rolling s And (5) calculating and using.
More preferred is the actual wall thickness delta of the conduit and the actual outer diameter D of the conduit t Actual inner diameter D of sleeve j The respective measurement for a plurality of times is uniformly arranged on the circumference of the pipe wall of the catheter, and the actual average value obtained by measurement is brought into a compensation formula to obtain the actual inner diameter value after rolling; and finally, rolling and measuring the actual inner diameter value after rolling, wherein the actual inner diameter value must fall into the calculated value of the inner diameter range value after rolling, and the actual inner diameter value is defined as qualified, otherwise, the actual inner diameter value is defined as unqualified.
In the actual operation process, before rolling, firstly measuring the wall thickness delta 4 times of the catheter, and respectively measuring 4 delta values at the positions of 0 degree, 90 degree, 180 degree and 270 degree of the wall of the catheter; actual inner diameter D of measuring tube sleeve j 2 times respectively in the tubeThe sleeve 2 is positioned at 0 ° and 180 ° or 90 ° and 270 ° positions; measuring the actual outer diameter D of the catheter t 2 times at the 0 deg. and 180 deg. positions of the catheter, or at the 90 deg. and 270 deg. positions of the catheter. Secondly, the actual average value is calculated by the measured values, and the calculated actual average value is brought into a compensation formula to obtain the actual inner diameter value D after rolling s The method comprises the steps of carrying out a first treatment on the surface of the Finally, rolling and measuring the actual inner diameter value D after rolling s Must fall within the range of values (calculated values) for the inner diameter after rolling, defined as pass, otherwise defined as fail.
More preferred is an actual inner diameter D of the rolled sleeve j The measuring point of (2) is the center position 23 of the third notch 22 of the notch of the sleeve 2 far from the sealing surface 21 of the sleeve, which can ensure the calculated actual inner diameter value D of the catheter after rolling s Better and more accurate.
Example 1
The data of tables 1 and 2, 3 and 4 below were obtained by rolling the g8x0.6, g10x0.7 and G12x1 catheters as test subjects and compensating by the above-mentioned compensation method.
Table 1 shows a list of values compensated by the complementary method according to the invention, as well as theoretical data and measured data of the three catheter specifications
Table 2 shows the calculated actual internal diameter D of the rolled catheter, which is compensated by the G8x0.6 catheter using the compensation formula of the present invention s Comparing with the Dsc data of the actual internal diameter value after rolling obtained after the actual rolling
As seen in Table 2, the G8x0.6 catheter was compensated for the resulting calculated inner diameter D after rolling using the compensation formula described above s The measured actual inner diameter value D after rolling sj In the case where the filling rate C is more than 85%The actual measured value of the inner diameter value after rolling is required to fall into D sj And (0-0.12) meets the use requirements.
Table 3 shows the calculated actual internal diameter D of the rolled catheter, which is compensated by using the compensation formula of the invention for G10x0.7 catheter s Comparing with the Dsc data of the actual internal diameter value after rolling obtained after the actual rolling
As seen in Table 3, G10X0.7 calculates the inside diameter D after rolling the resulting pipe with the above compensation formula s The measured actual inner diameter value D after rolling sj In the case where the filling rate C is more than 85%,
the actual measured value of the inner diameter value after rolling is required to fall into D sj And (0-0.14) meets the use requirement.
Table 4 shows the actual internal diameter D of the rolled catheter obtained by the calculation of the G12x1 catheter data compensated by the compensation formula of the invention s Comparing with the Dsc data of the actual internal diameter value after rolling obtained after the actual rolling
As seen from Table 4 above, the G12x1 catheter was compensated for the resulting catheter rolled using the compensation formula described above to calculate the inside diameter D s The measured actual inner diameter value D after rolling sj Under the condition that the filling rate C is more than 85%, the actual inner diameter value measured value after rolling is required to fall into D sj And (0-0.14) meets the use requirement.
From the above, it can be seen that the method for compensating the rolling inner diameter of the conduit according to the present invention increases the correction of the rolling torque variation caused by the wall thickness variation of the variable conduit and the outer diameter variation of the conduit in the conduit rolling process, eliminates the torque uncertainty factor in the flares-free rolling process, and realizes the precise rolling of the hydraulic flares-free connection technology, thereby providingHigh actual internal diameter value D after rolling s The precision of (2) can be further obtained, so as to ensure the dimensional precision of the conduit obtained by rolling, ensure that the conduit has better sealing performance during working, and finally improve the safety use performance of the aircraft.
The embodiments of the present invention are disclosed as preferred embodiments, but not limited thereto, and those skilled in the art will readily appreciate from the foregoing description that various extensions and modifications can be made without departing from the spirit of the present invention.

Claims (9)

1. The catheter rolling inner diameter compensation method is characterized in that:
obtaining a catheter to be rolled, obtaining a theoretical wall thickness of the catheter, a theoretical inner diameter of a joint and a theoretical outer diameter of the catheter, which are required to be obtained after the catheter is rolled, and calculating to obtain a theoretical inner diameter value of the catheter after the catheter is rolled;
according to the theoretical wall thickness of the conduit and the conduit material obtained in the last step, the required wall thickness of the conduit corresponding to the conduit made of the material is prepared, and the rolling flow change value of the conduit wall thickness under the preset rolling torque is obtained;
the following parameters of the actual catheter to be rolled are measured: the actual wall thickness of the catheter, the actual outer diameter of the catheter and the actual inner diameter of the sleeve;
the actual internal diameter value D of the catheter after rolling is calculated by using the following compensation formula s :
D s ＝D so +2(δ 0 -δ)+(D j -D j0 )+(D t -D to )-C；
Wherein: delta 0 -theoretical wall thickness of the conduit, delta-actual wall thickness of the conduit, D jo -theoretical internal diameter of the joint, D to Theoretical outside diameter of the catheter, D t -actual outer diameter of catheter, D so Theoretical internal diameter value after rolling of the conduit, C-conduit wall thickness rolling flow variation value, D j -actual inner diameter of sleeve, D s -the actual internal diameter value of the catheter after rolling.
2. The method for compensating for the rolling inner diameter of a catheter according to claim 1, wherein:
the rolling flow variation value of the wall thickness of the conduit under the preset rolling torque is obtained according to the following steps:
s1, acquiring a material conduit, and measuring the thickness of the conduit aiming at the conduit with the same thickness ， Rolling the catheter with the same rolling torque;
s2, cutting the rolled catheter, measuring the thickness of the catheter, and calculating the wall thickness rolling flow change value of the catheter:
C＝δ rear part (S) -δ Front part ；
δ Front part Thickness of the tube before rolling, delta Rear part (S) -cutting the rolled catheter thickness;
s3, recording the material conduit: material properties, thickness and rolling torque, and the wall thickness of the conduit at that thickness.
3. The method for compensating for the rolling inner diameter of a catheter according to claim 2, wherein:
the step of rolling the flow variation value C of the wall thickness of the conduit under the preset rolling torque, further comprises the following steps:
s4, repeating the steps at least once to obtain the wall thickness rolling flow change value of the guide pipe with the same material property, thickness and rolling torque;
s5, calculating the average value of the rolling flow change value of the wall thickness of the catheter.
4. A catheter roll id compensation method according to claim 3, wherein:
repeating the steps S1-S5 to obtain the rolling flow change value of the wall thickness of the conduit of different materials with different rolling torque, so as to form a standard value series of the rolling flow change value of the wall thickness of the conduit of each material with different wall thickness and different rolling torque.
5. The method for compensating for the rolling inner diameter of a catheter according to claim 1, wherein:
the theoretical internal diameter value after the rolling of the catheter has the following calculation formula:
D so ＝＝D j0 +2m-2δ o
wherein: m-depth of notch in inner wall of catheter, D so Theoretical internal diameter value after rolling of the catheter.
6. A catheter roll id compensation method according to claim 3, wherein:
the actual wall thickness of the catheter was measured 3 times and more, and then the average of all the measured data was taken.
7. The method for compensating for the rolling inner diameter of a catheter according to claim 6, wherein:
the actual outer diameter of the catheter and the actual inner diameter of the sleeve are measured for 2-5 times.
8. The method for compensating for the rolling inner diameter of a catheter according to claim 7, wherein:
the actual wall thickness of the catheter, the actual outer diameter of the catheter and the actual inner diameter of the sleeve are respectively and evenly arranged in the circumferential direction of the catheter wall in a plurality of times.
9. The method for compensating for the rolling inner diameter of a catheter according to any one of claims 1 to 8, wherein:
the measuring point of the actual inner diameter of the rolled tube sleeve is the center position (23) of a third notch (22) of the notch at the position of the tube sleeve (2) far away from the tube sleeve sealing surface (21).
CN202210812811.6A 2022-04-01 2022-07-12 Method for compensating rolling inner diameter of guide pipe Pending CN117816847A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202210339637 2022-04-01
CN2022103396378 2022-04-01

Publications (1)

Publication Number Publication Date
CN117816847A true CN117816847A (en) 2024-04-05

Family

ID=90521341

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210812811.6A Pending CN117816847A (en) 2022-04-01 2022-07-12 Method for compensating rolling inner diameter of guide pipe

Country Status (1)

Country Link
CN (1) CN117816847A (en)

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