CN109531068B - Deep hole piston rod deep hole and excircle coaxiality control method - Google Patents
Deep hole piston rod deep hole and excircle coaxiality control method Download PDFInfo
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- CN109531068B CN109531068B CN201811542287.5A CN201811542287A CN109531068B CN 109531068 B CN109531068 B CN 109531068B CN 201811542287 A CN201811542287 A CN 201811542287A CN 109531068 B CN109531068 B CN 109531068B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B5/25—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
- G01B5/252—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes for measuring eccentricity, i.e. lateral shift between two parallel axes
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Abstract
The invention provides a method for controlling the coaxiality of a deep hole and an excircle of a deep-hole piston rod, which comprises the following steps of: (a) the large-head end face and the orifice end face of the piston rod are leveled, each excircle of the piston rod is semi-finished, and a blind hole is drilled from the center of the orifice end; (b) measuring the wall thickness of a circle at the deep part of the blind hole, and calculating the correction size of the excircle of the large head end; (c) by utilizing the corrected dimension, the position corresponding to the central axis of the blind hole is aligned on the excircle of the large end, and two reference excircles are lathed on each excircle of the piston rod; (d) the piston rod is fixed by taking two reference excircles as references, the end face of the big head end is turned flatly, the central hole of the end face of the big head end is corrected, the excircle of the big head end is turned to the required size through the central hole of the big head end, the end face of the orifice end is turned flatly, the inner spigot of the orifice end is turned, and other excircles are turned to the required size through the inner spigot of the orifice end. The method for controlling the coaxiality of the deep hole and the excircle of the deep-hole piston rod has the advantages of novel design, good product quality, low production cost and high production efficiency.
Description
Technical Field
The invention relates to a process for producing a deep-hole piston rod, in particular to a method for controlling coaxiality of a deep hole and an excircle of a deep-hole piston rod.
Background
The mining hydraulic support is important equipment for ensuring the safety production of a coal mine, and the mining hydraulic support takes hydraulic pressure as power to realize actions such as lifting, forward moving, supporting and the like. The jack is a key part of the hydraulic support and is an execution unit for completing various actions of the hydraulic support, and the action quality of the hydraulic support is determined by the action precision of the jack. In order to ensure the requirement of the action quality of the hydraulic support, a displacement sensor is arranged in the key jack, the jack of the displacement sensor is arranged in the key jack, and the piston rod is a blind hole (deep hole) piston rod which requires that the coaxiality error of the blind hole and the excircle of the piston rod is less than 0.4 mm.
The conventional processing technology of the blind hole piston rod comprises the following steps:
a. processing each excircle to a required size;
b. and (4) performing jet-suction drilling on the blind hole by taking the excircle as a reference.
The conventional processing scheme needs to rely on the precision of deep hole drilling equipment to ensure the coaxiality of the blind hole and the excircle. The deflection precision of the common deep hole drilling equipment is 1/1000, the blind hole depth of the blind hole piston rod is about 1m generally, and the coaxiality error between the final product blind hole and the outer circle of the piston rod is about 1mm generally. In order to meet the requirement of coaxiality, measures such as improving the precision of tools and cutters and reducing machining parameters are generally adopted, so that the production cost is high, the efficiency is low, and the qualification rate is not easy to guarantee.
In order to solve the above problems, people are always seeking an ideal technical solution.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for controlling the coaxiality of a deep hole piston rod deep hole and an excircle, which has the advantages of novel design, low production cost and high production efficiency, and can ensure that the coaxiality error of the inner hole and the excircle is less than 0.4 mm.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for controlling the coaxiality of a deep hole and an excircle of a deep-hole piston rod comprises the following steps:
(a) the large-head end face and the orifice end face of the piston rod are leveled, each excircle of the piston rod is semi-finish-turned, and a blind hole is drilled from the center of the orifice end;
(b) measuring the wall thickness of a circle at the deep part of the blind hole, and calculating the correction size of the excircle of the big head end;
(c) by utilizing the corrected dimension, the position corresponding to the central axis of the blind hole is aligned on the excircle of the large head end, and two reference excircles are lathed on each excircle of the piston rod;
(d) and fixing the piston rod by taking the two reference excircles as references, flattening the end face of the big head end, correcting the central hole of the big head end, flattening the excircle of the big head end to a required size through the central hole of the big head end, flattening the end face of the orifice end, flattening the inner spigot of the orifice end, and flattening other excircles to the required size through the inner spigot of the orifice end.
Based on the above, two the benchmark excircle all sets up outside the blind hole, it still includes two the wall thickness of benchmark excircle a week carries out the step of reinspection. Specifically, the wall thickness of each of the two reference excircles is rechecked by using an ultrasonic detector, the maximum wall thickness and the minimum wall thickness of the reference excircles are recorded, and when the minimum wall thickness subtracted from the maximum wall thickness is smaller than 0.4mm, the reference excircles are qualified and can be processed in the next step.
Based on the above, the step (a) comprises the following steps:
(a1) leveling the end surface of the big end and the end surface of the orifice of the piston rod, and semi-finish turning each excircle of the piston rod;
(a2) and clamping the excircle of the big head end by using a three-jaw self-centering chuck, and drilling a blind hole from the center of the orifice end by using a center frame to support the excircle of the orifice end.
Based on the above, in the step (a 1), a 3mm margin is left in the diameter direction of each excircle of the piston rod by semi-finish turning.
Based on the above, the step (b) comprises the following steps:
(b1) detecting the wall thickness of the deepest part of the blind hole by using an ultrasonic detector, marking the wall thickness value of one circle, and recording the values of the maximum wall thickness 1 and the minimum wall thickness 2;
(b2) and calculating the correction size of the excircle of the big head end by using the marked wall thickness value.
Based on the above, in the step (b 2), the correction size is calculated using the formula = K (1-2) × L1/L2, where K is a correction coefficient (value is generally 1-1.2), 1 is the maximum wall thickness, 2 is the minimum wall thickness, L1 is the total length of the piston rod, and L2 is the blind hole depth.
Based on the above, the step (c) comprises the steps of:
(c1) clamping the excircle of the big head end by using a four-jaw chuck, adjusting the four-jaw chuck by using the excircle of the orifice end of a center frame, and performing table-making alignment by using a magnetic dial indicator; specifically, the four-jaw chuck is adjusted to rotate at a low speed, and a magnetic dial indicator is used for striking and aligning the meter at the outer circle striking position of the large end.
(c2) Turning two reference excircles, two the reference excircles are respectively for setting up the frame nest and the excircle dop at blind hole both ends, so that revise blind hole and excircle axiality.
Based on the above, the alignment criteria in step (c 1) are that the maximum wall thickness direction of the piston rod is the maximum dimension, the minimum wall thickness direction is the minimum dimension, and the maximum dimension-the minimum dimension = the corrected dimension.
Based on the above, the step (d) comprises the following steps:
(d1) clamping the excircle clamping head by using a three-jaw self-centering chuck, leveling the end surface of the big head end by using a central frame to support the nest, and correcting the central hole of the big head end; jacking the center hole of the big head end, removing the center frame, and turning the outer circle of the big head end to a required size;
(d2) clamping the excircle of the big head end by using a three-jaw self-centering chuck, erecting the excircle clamping head by a center frame, flattening the end face of the orifice end, and turning the size of an inner spigot of the orifice end; and pushing the inner spigot at the orifice end, removing the central frame, and turning other outer circles of the piston rod to the required size.
Compared with the prior art, the blind hole piston rod has outstanding substantive characteristics and remarkable progress, and particularly, the blind hole piston rod is different from the traditional blind hole piston rod processing method and has the following advantages:
(1) the outer circles of the piston rod are firstly subjected to semi-finish turning, the blind holes are drilled, then the sizes of the outer circles of the piston rod are machined by taking the blind holes as a reference, and the coaxiality of the outer circles and the blind holes is greatly improved.
(2) And rechecking the wall thickness of the reference excircle by using an ultrasonic detector, so that the process control forms a closed loop, and the coaxiality after correction meets the requirement.
(3) When the outer circles of the piston rod are semi-finished, a 3mm allowance is reserved in the diameter direction, and a guarantee is provided for correcting coaxiality.
(4) Utilize the ultrasonic wave detection instrument to detect blind hole deepest wall thickness deviation, the blind hole also can crescent along with the increase of degree of depth, measures the wall thickness deviation of blind hole deepest, can provide more accurate basic data, recycles formula calculation correction size, accurate quantization correction size.
(5) The four-jaw chuck is matched with the magnetic dial indicator for alignment, so that the feasible and reliable correction process is ensured; will two the benchmark excircle car is in blind hole both ends, on the one hand the excircle dop sets up at the outermost end, can make things convenient for three-jaw self-centering chuck to block, and on the other hand two benchmark excircle distances are more far away, and the degree of rectifying is big more, through right the control of blind hole both ends axiality can further improve the axiality precision.
Drawings
Fig. 1 is a schematic view of a deep-hole piston rod involved in the method of the present invention.
FIG. 2 is a schematic diagram of the positions of the support socket and the excircle clamp related to the method of the invention.
Fig. 3 is a schematic illustration of the maximum wall thickness 1 and the minimum wall thickness 2 marking involved in the method of the invention.
In the figure: 1. a big head end; 2. an orifice end; 3. the middle part of the outer circle; 4. blind holes; 5. a wall thickness detection position; 6. an outer circle chuck; 7. erecting a nest; 8. and an inner spigot.
Detailed Description
The technical solution of the present invention is further described in detail by the following embodiments.
As shown in fig. 1-3, a common piston rod is taken as an example: setting the excircle diameter of a bore end 2 to be phi D1, the excircle diameter of a middle part 3 to be phi D2, the excircle diameter of a big head end 1 to be phi D3, the diameter of a blind hole 4 to be phi D, the total length of a piston rod to be L1, the depth of the blind hole 4 to be L2, the length of an orifice end 2 to be L3 and the sum of the lengths of the orifice end 2 and the excircle diameter of the middle part 3 to be L4, wherein phi D1= phi 110mm, phi D2= phi 120mm, phi D3= phi 130mm, phi D = phi 20.5mm, L1=1572mm, L2=1315mm, L3=141mm and L4=1387mm, and the method for controlling the coaxiality of the deep hole and the excircle diameter of the piston rod comprises the following steps:
in the first step, stock is prepared, and the size of the raw material of the piston rod is phi 135mm 1578 mm.
And secondly, clamping one end (the large head end 1 or the orifice end 2) of the piston rod by using a three-jaw self-centering chuck, and respectively turning and flattening two end faces of the other end of the piston rod of the center frame, wherein the total length is 1572mm and is 1574(0, +1) mm.
Thirdly, clamping the orifice end 2 and the top big end 1 of the three-jaw self-centering chuck: 130mm of the excircle of the semi-finish turning big head end 1 is 133 mm.
The piston rod tune, 1 excircle (phi 133mm excircle) of big head end of three-jaw self-centering chuck card, top orifice end 2: 110mm of excircle of the semi-finish-turning orifice end 2 is 113 mm, 120mm of excircle of the middle part is 123 mm, 141mm of L3 length dimension is dried into 138 mm, 1387mm of L4 length dimension is dried into 1384 mm.
Fourthly, drilling a blind hole 4 with the diameter of 20.5mm at the right end of the excircle 3 (the excircle 123 mm) at the middle part of the central frame by utilizing the excircle 1 (the excircle 133 mm) at the big head end of the three-jaw self-centering chuck, and drying the blind hole 4 with the hole depth 1315mm into 1315(+2, +3) mm.
Fifthly, detecting a circle around the outer circle of the wall thickness detection position 5 by using an ultrasonic detector, marking the maximum and minimum wall thickness positions, and recording that the value of the maximum wall thickness 1 is 52 mm and the value of the minimum wall thickness 2 is 50.5 mm.
And sixthly, calculating the corrected dimension according to the wall thickness value measured in the fifth step.
The correction size calculation formula is as follows: =1.1 ≈ 50.5 ≈ 1572/1315 ≈ 1.97.
Seventhly, clamping the left end of the excircle (phi 133mm excircle) of the big head end 1 by the four-jaw chuck, and clamping the right end of the excircle (phi 123 mm excircle) of the middle part of the center frame: and adjusting the four-jaw chuck, rotating at a low speed, and using a magnetic dial indicator to beat and align the meter at the position of the excircle (phi 133mm excircle) of the large head end 1. The alignment standard is that the maximum wall thickness direction of the piston rod is the maximum dimension, the minimum wall thickness direction is the minimum dimension, and the maximum dimension-minimum dimension = 1.97.
Eighthly, turning an outer circle chuck 6 at the end part of the orifice end 2 after alignment according to the seventh step, and turning a frame socket 7 at the deepest part of the blind hole 4, wherein the outer circle chuck 6 is 111 mm in diameter, 100mm in length, 3.2 mu m in diameter, and the frame socket 7 is 121mm in diameter, 100mm in length and 3.2 mu m in diameter.
And ninthly, rechecking the excircle of the positions of the frame nest 7 and the excircle clamp 6 by using an ultrasonic detector for one circle respectively. And respectively recording the numerical values of the maximum wall thickness and the minimum wall thickness, calculating the difference value to meet the coaxiality requirement of the blind hole 4 and each excircle, namely the maximum wall thickness-the minimum wall thickness is less than 0.4mm, entering a tenth step after the requirement is met, and otherwise, repeating the fifth step, the sixth step, the seventh step and the eighth step until the coaxiality requirement is met.
Step ten, clamping the excircle chuck 6 by using a three-jaw self-centering chuck and a central frame nest 7: flattening the end face 1mm of the big head end 1, and correcting the central hole of the big head end 1; and (3) pushing a center hole of the big head end 1, removing the center frame, and turning the excircle (phi 133mm excircle) of the big head end 1 of the piston rod to the phi 130mm excircle required size.
Step eleven, the piston rod turns around, utilizes three-jaw self-centering chuck card big-end 1 excircle (phi 130mm excircle), centre frame excircle dop 6: the end face of the orifice end 2 is planed to ensure that the total length L1 is 1572 +/-0.5 mm, and the orifice end 2 is planed to have various sizes of an inner spigot 8; and (3) pushing an inner spigot 8 of the orifice end 2, removing the central frame, turning the excircle of the orifice end 2 of the piston rod to the required size of phi 110mm, and turning the excircle of the middle part to the required size of phi 120 mm.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (7)
1. A method for controlling the coaxiality of a deep hole and an excircle of a deep-hole piston rod is characterized by comprising the following steps:
(a) the large-head end face and the orifice end face of the piston rod are leveled, each excircle of the piston rod is semi-finish-turned, and a blind hole is drilled from the center of the orifice end;
(b) measuring the wall thickness of a circle at the deep part of the blind hole, and calculating the correction size of the excircle of the big head end;
(c) by utilizing the corrected dimension, the position corresponding to the central axis of the blind hole is aligned on the excircle of the large head end, and two reference excircles are lathed on each excircle of the piston rod;
(d) fixing the piston rod by taking the two reference excircles as references, flattening the end face of the big head end, correcting the central hole of the big head end, flattening the end face of the orifice end by turning the excircle of the big head end through the central hole of the big head end to a required size, flattening the end face of the orifice end, turning the inner spigot of the orifice end, and turning other excircles to the required size through the inner spigot of the orifice end;
the step (b) comprises the steps of: (b1) detecting the wall thickness of the deepest part of the blind hole by using an ultrasonic detector, and marking the wall thickness value of one circle; (b2) calculating the correction size of the excircle of the big head end by using the marked wall thickness value;
in the step (b 2), the correction size is calculated by using the formula = K (1-2) × L1/L2, where K is a correction coefficient, 1 is a maximum wall thickness, 2 is a minimum wall thickness, L1 is a total length of the piston rod, and L2 is a blind hole depth.
2. The deep-hole piston rod deep-hole and excircle coaxiality control method according to claim 1, characterized in that: the two reference excircles are all arranged outside the blind holes, and the method further comprises the step of rechecking the wall thickness of one circle of the two reference excircles.
3. The deep-hole piston rod deep-hole and excircle coaxiality control method according to claim 1 or 2, wherein the step (a) comprises the following steps:
(a1) leveling the end surface of the big end and the end surface of the orifice of the piston rod, and semi-finish turning each excircle of the piston rod;
(a2) and clamping the excircle of the big head end by using a three-jaw self-centering chuck, and drilling a blind hole from the center of the orifice end by using a center frame to support the excircle of the orifice end.
4. The deep-hole piston rod deep-hole and excircle coaxiality control method according to claim 3, characterized in that: and (a 1) semi-finish turning each excircle diameter direction of the piston rod and reserving 3mm allowance.
5. The deep-hole piston rod deep-hole and excircle coaxiality control method according to any one of claims 1, 2 or 4, wherein the step (c) comprises the following steps:
(c1) clamping the excircle of the big head end by using a four-jaw chuck, adjusting the four-jaw chuck by using the excircle of the orifice end of a center frame, and performing table-making alignment by using a magnetic dial indicator;
(c2) and turning two reference excircles, wherein the two reference excircles are respectively a frame nest and an excircle clamping head which are arranged at two ends of the blind hole.
6. The deep-hole piston rod deep-hole and excircle coaxiality control method according to claim 5, characterized in that: the alignment standard in the step (c 1) is that the maximum wall thickness direction of the piston rod is the maximum dimension, the minimum wall thickness direction is the minimum dimension, and the maximum dimension-minimum dimension = the corrected dimension.
7. The deep-hole piston rod deep-hole and excircle coaxiality control method according to claim 6, wherein the step (d) comprises the following steps:
(d1) clamping the excircle clamping head by using a three-jaw self-centering chuck, leveling the end surface of the big head end by using a central frame to support the nest, and correcting the central hole of the big head end; jacking the center hole of the big head end, removing the center frame, and turning the outer circle of the big head end to a required size;
(d2) clamping the excircle of the big head end by using a three-jaw self-centering chuck, erecting the excircle clamping head by a center frame, flattening the end face of the orifice end, and turning the size of an inner spigot of the orifice end; and pushing the inner spigot at the orifice end, removing the central frame, and turning other outer circles of the piston rod to the required size.
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| CN111590271B (en) * | 2020-04-08 | 2021-11-12 | 武汉船用机械有限责任公司 | Pipeline machining method |
| CN112338460B (en) * | 2020-10-29 | 2023-08-04 | 郑州煤矿机械集团股份有限公司 | Processing method of integral piston rod of non-support jack |
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| US6266878B1 (en) * | 1999-02-02 | 2001-07-31 | Amcast Industrial Corporation | Process for producing variable displacement compressor pistons having hollow piston bodies and integral actuator rods |
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