CN110421186B - Method for correcting deflection of long and thin deep hole - Google Patents
Method for correcting deflection of long and thin deep hole Download PDFInfo
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- CN110421186B CN110421186B CN201910726044.5A CN201910726044A CN110421186B CN 110421186 B CN110421186 B CN 110421186B CN 201910726044 A CN201910726044 A CN 201910726044A CN 110421186 B CN110421186 B CN 110421186B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
- B23B29/02—Boring bars
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
- B23B29/03—Boring heads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B41/00—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
- B23B41/02—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor for boring deep holes; Trepanning, e.g. of gun or rifle barrels
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Abstract
The invention relates to a method for correcting deflection of a bored slender deep hole. Three sharp knives and a smooth knife are arranged on the boring head, the first sharp knife is reversely arranged, wood keys and plastic keys are arranged in an upper key groove and a lower key groove of the boring head, a deep hole drilling and boring machine is started to rotate a workpiece to be bored, the sharp knives are arranged to be horizontal, and the boring head is arranged in a guided hole; during boring, the boring rod is supported by a support sleeve and a plastic key in a double stable mode, a long and sunken boring head is supported, the boring head is tightly attached to a hole by utilizing the thermal expansion property of plastic, a gap is reserved between a wood key and the wall of the hole, the boring head can float freely, and the straightness requirement of the hole is effectively controlled; and (4) measuring the bored holes by arranging measuring belts at equal intervals, measuring and recording the wall thickness difference measuring data once, and finding out whether the holes are inclined or not and the inclined direction of the holes to correct the deviation. The invention has good deviation rectifying effect. For a deep hole of a propeller shaft with the length of 23m and the slenderness ratio of 153, the hole straightness reaches 0.87 mm.
Description
Technical Field
The invention relates to a method for correcting deflection of a bored long and thin deep hole.
Background
The conventional process route of deep hole finish machining is as follows: drilling → rough boring → semi-fine boring → row tip and grinding, after drilling, during rough boring, the straightness (controlled by the wall thickness difference in the straightness machining process) of the hole must be controlled within the range required by the drawing, because the machining allowance of the hole in the semi-fine boring and later stages is small, the risk of deep hole machining failure is likely to be faced, and the deviation of the hole is not easy to correct. In the deep hole finish machining process, the deflection of the hole is almost generated or the deflection cannot be corrected, particularly the slender deep hole with a large slender ratio.
The main reasons for the situation of correcting hole deflection in the deep hole finishing process are: due to the fact that the deflection is generated due to the fact that the boring rod is too long in the machining process or the rigidity of the boring rod is insufficient, the front end of the boring rod is connected with the boring head and is affected by the deflection, the boring head sinks, the center of the boring head and the center of the boring rod slightly deviate, the straightness of a machined hole is poor, and the hole deviates in the machining process.
When a ship-shaped propeller shaft is used for deep hole machining, the total length of the propeller shaft is more than 23 meters, the length-diameter ratio of the length and the diameter of a central through hole reaches 153, the straightness of the hole is less than or equal to 1.25mm, the requirement is extremely high, and the deep hole finish machining difficulty is extremely high. In the processing process, the conventional processing method for correcting the deflection of the deep hole is applied, the maximum wall thickness difference of the hole reaches 11mm, and after repeated investigation for 15 days, the wall thickness difference of the hole still reaches 7mm, so that the wall thickness difference of the hole cannot be corrected by using the conventional method, the straightness of the hole is improved, and the final drawing requirement is extremely difficult to meet.
Disclosure of Invention
The invention aims to provide a method for correcting the processing deflection of the long and thin deep hole on a deep hole drilling and boring machine, which is effective, feasible and easy to operate, and can correct the deflection of the long and thin deep hole with the length of more than 23 meters, the length-diameter ratio of 153 of a propeller shaft deep hole and the straightness of 0.87mm after the processing of the hole is corrected for deflection for multiple times (hereinafter, correction for short).
The invention aims to realize a method for correcting the deflection of a bored long and thin deep hole, which comprises the following specific steps:
1) the front end of the boring bar joint is connected with a boring head, the rear end of the boring bar joint is connected with a boring bar, the outer layer of the boring bar joint is wrapped by a support sleeve, and the support sleeve is fixed on the boring bar joint through a bolt;
2) the sharp cutter is used for guiding the hole, the actual size of the bottom hole is measured firstly, the diameter size of the re-boring hole is calculated according to the actual size and the deviation correcting amount required by the hole, and the sharp cutter arranged on the boring head is used for boring the hole from the hole opening to 200 +/-10 mm, so that the sharp cutter is used for guiding the hole; removing a sharp cutter on the boring head, and replacing a smooth cutter, wherein the smooth cutter is tightly attached to the hole wall for tool setting; measuring the size of a bottom hole machined by a sharp cutter, carrying out tool setting and boring from an orifice according to the size of the bottom hole plus 0.2mm, and boring to the depth of a leading hole of the sharp cutter;
3) the sharp knife hole of the boring head is provided with three sharp knives, the first sharp knife is reversely arranged, the hole opening is aligned with the knife, and a gap of 3mm is reserved between the first sharp knife and the wall of the processed hole; the second sharp knife and the third sharp knife are installed in a right-handed manner; the hole is subjected to tool setting, and a gap of 0.1mm is reserved between the second sharp cutter and the wall of the processed hole; setting a tool at the hole opening, and reserving a gap of 0.15mm between the sharp knife and the hole wall of the processed hole; a smooth cutter hole of the boring head is provided with a smooth cutter;
4) when the two cutting edges of the sharp cutter are in a horizontal state and the tool tip faces to one side of an operator, wood keys are arranged in the two upper key grooves of the boring head, and a gap of 1mm is reserved between each wood key and the wall of the hole; plastic keys are arranged in the two lower key grooves;
5) the outer layer of the boring bar joint is wrapped by a support sleeve, and the support sleeve is fixed on the boring bar joint through a bolt; the support sleeve is a semicircular lower support sleeve or a support sleeve consisting of a semicircular upper support sleeve and a semicircular lower support sleeve; the outer diameter of the support sleeve is 1-2mm larger than the aperture of the long and thin deep hole;
6) aligning, starting a deep hole drilling and boring machine to rotate a workpiece needing to bore a long and thin deep hole, enabling a sharp knife on a boring head to be in a horizontal direction, and drilling the boring head into the hole guided by the step 2); when the side surface of the optical cutter with the angle of 90 degrees enters the hole 1/3, recording the scales as the starting point of hole depth processing, then looking at the size of a rear pointer of the deep hole drilling and boring machine, and making a hole depth record;
7) the method comprises the following steps of boring, starting a deep hole drilling and boring machine to enable a workpiece needing to bore a long and thin deep hole to rotate, enabling a boring rod to enter the hole to bore, enabling the boring rod to be stably supported by a support sleeve and a plastic key during boring, supporting a sinking boring head after being suspended to be long, enabling the boring head to be tightly attached to the hole by using the thermal expansion property of the plastic, and enabling the boring head to float freely by using a wood key and a hole wall to leave a gap, so that the straightness requirement of the hole is effectively controlled;
setting a measuring band for every 500mm of the bored hole, and measuring the wall thickness difference of the hole in four directions at the position of the first measuring band by using a thickness gauge when the boring depth of the bored hole exceeds the depth of the first measuring band, and respectively recording the wall thickness difference; recording wall thickness difference measurement data once every other measurement band, and comparing the measurement data to see whether the hole deflects and the direction of the hole deflection;
through the multiple deviation rectifying processing cycles, the wall thickness difference of the hole is continuously improved, the straightness of the hole is smaller and smaller, and then the processing of correcting the deviation of the long and thin deep hole is completed.
By adopting the invention to process the propeller shafts with the length of 23m, the slenderness ratio of deep holes of the propeller shafts reaches 153, the straightness of the corrected holes reaches 0.87mm, and the screw shafts can successfully pass the inspection of 2m inspection sample rods.
The invention can finish the processing of correcting the deflection of the long and thin deep hole and has good deep hole deviation correcting effect.
Drawings
FIG. 1 is a schematic view showing the structure of a boring device used in the present invention, only having a lower support sleeve,
FIG. 2 is a schematic view showing the structure of a boring device having upper and lower support sleeves used in the present invention,
FIG. 3 is a top view of the structure of a boring device having upper and lower support sleeves for use with the present invention,
fig. 4 is a structural working state diagram of a boring device used in the invention.
Detailed Description
The present invention is described in detail below with reference to the accompanying drawings.
Referring to fig. 1, 2 and 3, the boring device used in the invention has a boring head 1 connected to the front end of a boring bar joint 2, a boring bar 3 connected to the rear end of the boring bar joint 2, and a support sleeve wrapped on the outer layer of the boring bar joint 2 and fixed on the boring bar joint 2 through a bolt.
According to the invention, a support sleeve is wrapped on the outer layer of the boring bar joint 2, and the support sleeve is a support sleeve in the stable support device for boring long and thin deep holes (patent application number 201920428681.X) of the applicant. The support sleeve is fixed on the boring bar joint through a bolt. The supporting sleeve is a semicircular lower supporting sleeve 10 or a supporting sleeve consisting of a semicircular upper supporting sleeve 11 and a semicircular lower supporting sleeve 10. The outer diameter of the support sleeve is 1-2mm larger than the aperture of the long and thin deep hole.
When the boring bar of the boring hole is suspended within 8m, the outer layer of the boring bar joint 2 only wraps the lower support sleeve; when the hanging length of the boring bar 3 is 8m-12m, the support sleeve wrapped on the outer layer of the boring bar joint 2 is composed of an upper support sleeve 11 and a lower support sleeve 10 which are semicircular.
The actual size of the bottom hole is measured firstly, the diameter size of the re-boring hole is calculated according to the actual size and the deviation correction amount required by the hole, a sharp cutter is installed in a sharp cutter hole on the boring head, and the sharp cutter installed on the boring head is used for boring into the hole from the hole opening by 200 +/-10 mm, so that the sharp cutter leading hole is completed. The sharp cutter guide hole enlarges the size of the bottom hole, gives the tool consumption for correcting the hole, and is convenient for a boring head to drive a cutter to enter the hole for cutting. Removing a sharp cutter on the boring head, installing a smooth cutter on a smooth cutter hole, and aligning the smooth cutter tightly attached to the hole wall; and measuring the size of the bottom hole machined by the sharp cutter, and setting and boring from the hole opening according to the size of the bottom hole and the required deviation correction amount, wherein the boring depth is up to the depth of the leading hole of the sharp cutter. The smooth cutter leading hole is based on the sharp cutter leading hole, the roughness of the leading hole part is improved, the boring head can conveniently and stably enter the hole and then move, and the vibration phenomenon cannot occur.
The invention changes the three sharp knives installed in the sharp knife hole into a sharp knife I4 which is installed reversely, sets the knife in the hole opening, and leaves a 3mm gap between the sharp knife I and the hole wall of the processed hole. The second sharp knife 5 and the third sharp knife 6 are arranged in a right-handed manner; the hole is subjected to tool setting, and a gap of 0.1mm is reserved between the second sharp cutter 5 and the hole wall of the processed hole; the hole is adjusted by tool, and the sharp knife leaves a gap of 0.15mm from the hole wall of the processed hole. And a smooth cutter hole of the boring head is provided with a smooth cutter 7.
The main cutting tools of the boring device are generally a first sharp tool and a second sharp tool, the first sharp tool 4 is reversely arranged, the normally arranged second sharp tool 5 and the reversely arranged first sharp tool are stressed simultaneously in the 180-degree direction during cutting, the stress is uniform, the stress is almost equal, but the stress is opposite in direction, the cutting force is balanced, and the conditions that the boring rod is vibrated and the center position is deviated due to uneven cutting force when the boring rod is too long in length suspension are avoided, so that the quality of bored holes is influenced.
If the deflection of the measured hole is larger, the deflection does not need to be added to the size of the lead hole at one time, and the measurement can be carried out by multiple cutters, so that the adverse effect of large processing stress on hole deviation correction in the processing process can be avoided.
The diameter of a wood key arranged in the conventional key groove is 1-2mm larger than that of the processed hole, and the wood key is ground into the processed hole.
When the cutting edges of the second sharp cutter 5 are in a horizontal state and the tool tip faces one side of an operator, wood keys 8 are arranged in the two upper key grooves of the boring head, and a gap of 1-2mm is reserved between each wood key and the wall of the hole. The plastic keys 9 are arranged in the two lower keyways and are ground into the holes by the size larger than the aperture by 1-2 mm. In the process of correcting the hole, a 1mm gap is reserved between the wood key 8 and the processed hole wall, and the wood key arranged in the key groove hardly plays a supporting role, so that the boring head 1 can float in the hole when the boring rod 3 is long in suspension length. And when rectifying, the single-side cutting is often carried out, the single-side cutting has a single-side upward impact force, and in order to buffer the impact force, a 1mm gap is reserved between the wood key and the hole wall, so that the rectification is facilitated.
The invention installs plastic keys 9 in the two lower keyways, and the plastic keys are ground into the holes by the size larger than the aperture by 1-2 mm. The plastic key 9 generates friction heat along with the boring process, has good thermal expansion performance, closely attaches the holes by utilizing the thermal expansion performance, correspondingly changes along with the linear change of the bottoms of the processed holes, plays a supporting role, prevents the boring bar 3 from generating deviation due to floating in the holes when the boring bar is long in suspension, and is favorable for deviation correction.
According to the invention, a certain gap is reserved between the wood key 8 and the hole wall, if the straightness of the processed hole is good, the wood key does not play a supporting role, and a gap is left in the hole, so that the boring head 1 has certain floating in the hole when the boring bar 3 is long in suspension length, and the deviation correction of the hole is facilitated; if the wood key 8 is found to be worn, the deviation rectifying effect is poor.
When the boring device is used for boring, as the boring rod 3 is suspended for a long time, a certain deflection is formed by self weight, and in addition, the centers of the boring head 1 and the boring rod 3 can generate micro offset due to uneven cutting force, friction heat and the like, the straightness of holes with high form and position tolerance is difficult to ensure. The plastic key 9 arranged in the lower key groove of the invention interacts with the supporting sleeve, thus avoiding the hole from generating larger deflection due to the abrasion of one side. In terms of support, the plastic key is an auxiliary support, and the support sleeve plays a main supporting role.
The plastic key 9 is close to the supporting sleeve, which is equivalent to a supporting point of a lever, and the plastic key 9 and the supporting sleeve are used for supporting, and the rotating center of the tool nose of the sharp knife 7 is the same as the center of the boring bar 3, so that the deflection of the hole can be effectively corrected.
Aligning, starting a boring rod 3 on a deep-hole machine tool 13 to rotate a sharp cutter 7 on the boring head 1 to a horizontal position, and opening the boring head 1 into a hole guided by the sharp cutter and a smooth cutter; when the side surface of the smooth cutter with the angle of 90 degrees enters the hole 1/3, the scale is recorded as the starting point of hole depth processing, and then the size of a back pointer of the deep hole drilling and boring machine is seen, and hole depth recording is well made.
And (2) starting a deep hole machine tool 13 to rotate a workpiece 12 needing to bore a long and thin deep hole, enabling a sharp cutter 7 on the boring head 1 to be in a horizontal direction, enabling the boring rod 3 to enter the hole for boring, enabling the boring rod 3 to be stably supported by a support sleeve and a plastic key during boring, supporting the boring head which is suspended and sunk, and enabling the boring head to be tightly attached to the hole by utilizing the thermal expansion property of plastic, so that the boring head 1 moves close to the hole wall in the machining process of the hole, boring the hole to be deeper than 2m at one time, and ensuring that the size change of the rear section hole diameter of the machined hole is not large compared with the front section hole diameter. And a gap is reserved between the wood key and the hole wall, so that the boring head can float freely, and the straightness requirement of the hole is effectively controlled.
Setting a measuring band for every 500mm of the bored hole, and measuring the wall thickness difference of the hole in four directions at the position of the first measuring band by using a thickness gauge when the boring depth of the bored hole exceeds the depth of the first measuring band, and respectively recording the wall thickness difference; wall thickness difference measurements are recorded every other strip and the measurements are compared to see if the hole is deflected and the direction in which the hole is deflected.
Through the multiple deviation rectifying processing cycles, the wall thickness difference of the hole is continuously improved, the straightness of the hole is smaller and smaller, and then the processing of correcting the deviation of the long and thin deep hole is completed.
The feeding speed of the boring bar is 10-12 mm/min, and the cutting depth is determined according to the deflection value. When a deep hole with a large slenderness ratio value is machined, plastic keys are changed every 2m according to experience except that a tool is changed frequently.
The deviation of the hole is obviously improved compared with the conventional deviation correction depending on the machined hole. When the boring depth is 8m, the wall thickness difference of the holes can be controlled within 0.6 mm. When the boring depth exceeds 8m, the boring rod is suspended for 8m-12m, and the support sleeve is replaced by a support sleeve support consisting of an upper support sleeve and a lower support sleeve which are semicircular. Through multiple deviation-correcting processing cycles, the wall thickness difference of the hole is continuously improved, and the straightness of the hole is smaller and smaller.
And (3) boring a long and thin through hole with a length of 23m from one end into a hole with a length of 11m-12m, turning around, aligning the workpiece, feeding from the other end according to the steps, and correcting the deviation. Respectively controlling the straightness from two ends, determining whether the deflection is in the same direction according to the measurement result of the thickness difference of the overlapped parts processed at the two ends, and taking the maximum deflection value of one section as the deflection value of the long and thin deep hole if the deflection direction is in the same direction; if the deflection is in opposite directions, the two deflection values are added to be the deflection value of the long and thin deep hole. After the deviation correction of the invention, the wall thickness difference of the hole is generally within the required straightness accuracy range, and the deviation correction is successful. Then, the conventional processing method is used for carrying out semi-fine boring, tip discharging and hole grinding. In the semi-fine boring process, no matter the length of a workpiece, boring is required from one end, and feeding is not required from two ends.
According to practical operation, the invention is adopted to process a propeller shaft with the length of 23m, the slenderness ratio of a deep hole of the propeller shaft reaches 153, the straightness of the hole after deviation correction reaches 0.87mm, and the test of a 2-meter test sample rod is successfully passed.
Claims (5)
1. The method for correcting the deflection of the long and thin deep hole is characterized in that: the method comprises the following specific steps:
1) the front end of the boring bar joint is connected with a boring head, the rear end of the boring bar joint is connected with a boring bar, the outer layer of the boring bar joint is wrapped by a support sleeve, and the support sleeve is fixed on the boring bar joint through a bolt;
2) the sharp cutter is used for guiding the hole, the actual size of the bottom hole is measured firstly, the diameter size of the re-boring hole is calculated according to the actual size and the deviation correcting amount required by the hole, and the sharp cutter arranged on the boring head is used for boring the hole from the hole opening to 200 +/-10 mm, so that the sharp cutter is used for guiding the hole; removing a sharp cutter on the boring head, and replacing a smooth cutter, wherein the smooth cutter is tightly attached to the hole wall for tool setting; measuring the size of a bottom hole machined by a sharp cutter, carrying out tool setting and boring from an orifice according to the size of the bottom hole plus 0.2mm, and boring to the depth of a leading hole of the sharp cutter;
3) the sharp knife hole of the boring head is provided with three sharp knives, the first sharp knife is reversely arranged, the hole opening is aligned with the knife, and a gap of 3mm is reserved between the first sharp knife and the wall of the processed hole; the second sharp knife and the third sharp knife are installed in a right-handed manner; the hole is subjected to tool setting, and a gap of 0.1mm is reserved between the second sharp cutter and the wall of the processed hole; setting a tool at the hole opening, and reserving a gap of 0.15mm between the sharp knife and the hole wall of the processed hole; a smooth cutter hole of the boring head is provided with a smooth cutter;
4) when the two cutting edges of the sharp cutter are in a horizontal state and the tool tip faces to one side of an operator, wood keys are arranged in the two upper key grooves of the boring head, and a gap of 1mm is reserved between each wood key and the wall of the hole; plastic keys are arranged in the two lower key grooves;
5) the outer layer of the boring bar joint is wrapped by a support sleeve, and the support sleeve is fixed on the boring bar joint through a bolt; the support sleeve is a semicircular lower support sleeve or a support sleeve consisting of a semicircular upper support sleeve and a semicircular lower support sleeve; the outer diameter of the support sleeve is 1-2mm larger than the aperture of the long and thin deep hole;
6) aligning, starting a deep hole drilling and boring machine to rotate a workpiece needing to bore a long and thin deep hole, enabling a sharp knife on a boring head to be in a horizontal direction, and drilling the boring head into the hole guided by the step 2); when the side surface of the optical cutter with the angle of 90 degrees enters the hole 1/3, recording the scales as the starting point of hole depth processing, then looking at the size of a rear pointer of the deep hole drilling and boring machine, and making a hole depth record;
7) the method comprises the following steps of boring, starting a deep hole drilling and boring machine to enable a workpiece needing to bore a long and thin deep hole to rotate, enabling a boring rod to enter the hole to bore, enabling the boring rod to be stably supported by a support sleeve and a plastic key during boring, supporting a sinking boring head after being suspended to be long, enabling the boring head to be tightly attached to the hole by using the thermal expansion property of the plastic, and enabling the boring head to float freely by using a wood key and a hole wall to leave a gap, so that the straightness requirement of the hole is effectively controlled;
setting a measuring band for every 500mm of the bored hole, and measuring the wall thickness difference of the hole in four directions at the position of the first measuring band by using a thickness gauge when the boring depth of the bored hole exceeds the depth of the first measuring band, and respectively recording the wall thickness difference; recording wall thickness difference measurement data once every other measurement band, and comparing the measurement data to see whether the hole deflects and the direction of the hole deflection;
through the multiple deviation rectifying processing cycles, the wall thickness difference of the hole is continuously improved, the straightness of the hole is smaller and smaller, and then the processing of correcting the deviation of the long and thin deep hole is completed.
2. The method of correcting the deflection of a bored elongated deep hole according to claim 1, wherein: the supporting sleeve is a semicircular lower supporting sleeve or a supporting sleeve consisting of a semicircular upper supporting sleeve and a semicircular lower supporting sleeve; the outer diameter of the support sleeve is 1-2mm larger than the aperture of the long and thin deep hole; the supported boring bar is suspended within 8m in length and supported by a lower supporting sleeve; the boring bar has a hanging length of 8m-12m and is supported by a support sleeve consisting of an upper support sleeve and a lower support sleeve which are semicircular.
3. The method of correcting the deflection of a bored elongated deep hole according to claim 1, wherein: and (3) guiding the hole by an optical cutter, wherein the optical cutter is tightly attached to the wall of the hole, the actual size of the processed bottom hole is measured, the diameter size of the re-bored hole is calculated by adding the required deviation correction amount to the size of the bottom hole, and the tool and the bore are adjusted from the hole opening, and the bore depth is increased to the depth of the sharp cutter guiding hole.
4. The method of correcting the deflection of a bored elongated deep hole according to claim 1, wherein: the feeding speed of the boring bar is 10-12 mm/min, and the cutting depth is determined according to the deflection value of the hole.
5. The method of correcting the deflection of a bored elongated deep hole according to claim 1, wherein: boring a long and thin through hole with the length of 23 meters into the through hole from one end by 11-12 m, turning around, aligning the workpiece, feeding from the other end and correcting; the two ends respectively control the straightness, the overlapped parts processed at the two ends determine whether the deflection is in the same direction according to the measurement result of the thickness difference, the deflection direction is in the same direction, and the maximum deflection value of one section is taken as the deflection value of the long and thin deep hole; the deflection is in opposite directions, and two deflection values are added to be used as the deflection value of the long and thin deep hole.
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| CN114453611A (en) * | 2022-02-18 | 2022-05-10 | 武汉重工铸锻有限责任公司 | Method for finish machining of inner hole of ultra-long copper bush on deep hole drilling and boring machine |
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| GB2349425B (en) * | 1999-03-29 | 2003-03-19 | Deutz Ag | Internal geared wheeled pump with play compensation in the drive region |
| JP2009233780A (en) * | 2008-03-26 | 2009-10-15 | Yunitakku Kk | Deep-hole boring apparatus control system |
| CN106625026A (en) * | 2015-10-29 | 2017-05-10 | 中国航空工业第六八研究所 | Method for correcting deflection of deep and long holes of revolving parts like piston |
| CN205289781U (en) * | 2015-12-08 | 2016-06-08 | 通裕重工股份有限公司 | Deep hole boring head of rectifying |
| KR101738821B1 (en) * | 2016-09-22 | 2017-05-22 | 서경무 | The drill hole straightness correction device |
| CN106541303A (en) * | 2016-10-13 | 2017-03-29 | 武汉重工铸锻有限责任公司 | The grinding out method of deep hole drilling and boring machine |
| CN107775018A (en) * | 2017-09-30 | 2018-03-09 | 重庆长安工业(集团)有限责任公司 | Heavy caliber deep hole processing cutter |
| CN208628484U (en) * | 2018-08-05 | 2019-03-22 | 河南中原特钢装备制造有限公司 | Deep hole drilling and boring machine boring device for long-axle workpieces |
| CN109175905A (en) * | 2018-09-30 | 2019-01-11 | 成都飞机工业（集团）有限责任公司 | A kind of bilateral stepped hole part single side clamping method for drilling |
| CN109513953A (en) * | 2018-11-28 | 2019-03-26 | 武汉船用机械有限责任公司 | A kind of multipurpose deep-hole boring head and its application method |
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