CN109175913B - Method for processing MAN series marine low-speed diesel engine crosshead pin - Google Patents
Method for processing MAN series marine low-speed diesel engine crosshead pin Download PDFInfo
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- CN109175913B CN109175913B CN201811255338.6A CN201811255338A CN109175913B CN 109175913 B CN109175913 B CN 109175913B CN 201811255338 A CN201811255338 A CN 201811255338A CN 109175913 B CN109175913 B CN 109175913B
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Abstract
A method for processing a crosshead pin of a low-speed diesel engine for MAN series ships comprises a large excircle and two small excircles, wherein the two small excircles are coaxially connected to two sides of the large excircle respectively, tip holes are arranged on end faces of two sides of the small excircles, and a notch plane is arranged on the periphery of the large excircles; the processing method comprises the following specific steps: firstly, processing two end surfaces and a gap plane of a crosshead pin on a boring machine in a horizontal station; secondly, clamping a workpiece by adopting two centers on a lathe and processing a large excircle, a small excircle and each end surface; thirdly, finely machining all holes on the notch plane and the circumference by a vertical station on a boring machine; fourthly, grinding a large outer circle and a small outer circle on the grinding machine in a supporting grinding mode; and fifthly, clamping the workpiece by two centers on the polishing lathe to polish the crosshead pin workpiece. The invention has the advantages of less working procedures, short process route and less loading times, greatly improves the processing efficiency of the crosshead pin, reduces the labor intensity of operators and obtains the effects of time saving and labor saving.
Description
Technical Field
The invention relates to a manufacturing process of a marine low-speed diesel engine, in particular to a machining method of a MAN series marine low-speed diesel engine crosshead pin, and belongs to the technical field of machining.
Background
The crosshead pin is an important precise part and a key motion connecting part of the marine low-speed diesel engine, is mainly used for connecting a connecting rod and a piston rod, is provided with slide blocks at two ends, takes a rack guide plate as a guide, moves up and down in a reciprocating mode through the pushing of the piston rod, and drives the connecting rod and a crankshaft to rotate, so that the ship is pushed to move forwards and backwards. Referring to fig. 1, the crosshead pin of the MAN-series marine low-speed diesel engine is a large short-axis part, and mainly comprises a large outer circle 1 located in the middle and small outer circles 2 located at two ends, tip holes 5 are arranged on end faces 4 of two sides of the small outer circle 2, and a notch plane 3 is arranged on the periphery of the large outer circle 1.
When the crosshead pin rotates along with the connecting rod, the large excircle 1 of the crosshead pin is matched with the bearing bush and rotates relative to the bearing bush, so that the precision requirement is extremely high, and the crosshead pin belongs to a high-precision large part. The weight of a single part of the crosshead pin can reach 6 tons, the diameter of a large excircle 1 of the crosshead pin can reach 1000mm, the surface roughness of the large excircle 1 meets the requirement of Ra0.05, the cylindricity requirement does not exceed 0.02mm, the jumping degree requirement of the center of a relatively small excircle 2 does not exceed 0.01mm, and the large excircle 1 needs to be subjected to the procedures of excircle grinding and vibration polishing.
The traditional process method for machining the cross head pin is complex, long in process route and multiple in process, and one process also comprises multiple process steps, so that the times of getting on and off a workpiece are multiple, the occupied time of a machine tool is long, and the overall machining efficiency is very low.
The conventional processing method at present comprises the following steps:
the first process step: scribing, namely scribing allowance lines of all end surfaces and center lines of the end surfaces;
and a second step: boring machine-processing two end tip holes;
and a third step of: the method comprises the following steps of 1, turning a lathe (rough turning), clamping a rough turning large excircle and a chamfer, 2, clamping a supporting vehicle end face, a small excircle and a center hole, 3, clamping a supporting vehicle large excircle length, total length and the other end small excircle and the center hole;
step four: marking-marking end surface cross lines, lifting screw holes, notch planes and other processing lines;
and a fifth step: a boring machine, namely 1, a horizontal station, wherein a workpiece is horizontally placed, hoisting screw holes are machined in two end faces, 2, a vertical station is adopted, one end face of the workpiece faces downwards, a notch plane is milled, and holes on the circumferences of a large excircle and a small excircle are machined;
a sixth procedure: a drilling machine-1, vertically placing a workpiece, drilling a hole on the end face of one end, 2, turning the workpiece by 180 degrees, and drilling a hole on the end face of the other end;
a seventh step: a lathe (finish turning) -mounting a process insert on the plane of the notch, wherein 1, one clamp is used for clamping one top, a large excircle, a small excircle at one end and an end face are turned, 2, one clamp is used for clamping one top, and a small excircle and an end face at the other end are turned;
and eighth step: a vertical lathe (1) vertically placing a workpiece, finely machining a top hole chamfer at one end face, 2 turning the workpiece by 180 degrees, and finely machining a top hole chamfer at the other end;
the ninth procedure: grinding machine-top two end face tip hole, grinding large external circle and two end small external circles;
a tenth step: polishing-two end faces of the top are used for ejecting the tip holes, and the large excircle is vibrated and polished to meet the mirror surface requirement.
The traditional process method comprises ten processing procedures, and each procedure also involves a plurality of working steps and a plurality of getting-on and getting-off processes. The third procedure is as follows: a lathe (rough turning) needs to get on and off the train for 3 times; and a fifth step: a boring machine needs to get on and off the machine for 2 times; a sixth procedure: drilling machine, needing 2 times of getting on and off; a seventh step: a lathe (finish turning) needs to get on and off the train for 2 times; and eighth step: when standing the vehicle, the vehicle needs to get on and off 2 times. The total process of 16 times of getting on and off the vehicle is accumulated, which needs to consume a large amount of auxiliary processing time, and the processing efficiency is low because no cutting time without generating scrap iron is used.
The traditional crosshead pin processing method needs to get on and off for multiple times and needs to guarantee the processing precision of parts, for example, when a lathe (rough turning) is processed, because the balance of turning needs to be guaranteed, a notch plane is not processed in advance, lifting holes of two end faces cannot be processed in advance (the lifting holes have an angle relation with the notch plane), and therefore the processing mode of two centers cannot be used, and the traditional processing method of one clamping and one supporting can be adopted. When the boring machine is used for processing, all end face holes cannot be processed at one time due to the fastening mode of workpieces, and the end face holes must be processed by a drilling machine, so that a plurality of working procedures and the time for getting on and off are increased. The grinding machine adopts a top grinding mode, so that the processing requirements of the center holes are improved, the process of a vertical lathe must be added, the center holes at two ends are finely processed, and the process, the getting-on time and the getting-off time are increased.
Disclosure of Invention
The invention aims to solve the technical problem that the defects that a plurality of processes are needed and a MAN series marine low-speed diesel engine crosshead pin needs to get on and get off repeatedly in the existing process method are overcome, the processing method of the MAN series marine low-speed diesel engine crosshead pin is provided, and a proper tool is matched for use, so that the process route is greatly shortened, the getting on and off time is reduced, the invalid auxiliary working time is reduced, and the overall processing efficiency of parts is improved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a machining method of a crosshead pin of a low-speed diesel engine for MAN series ships comprises a large outer circle and two small outer circles, wherein the two small outer circles are coaxially connected to two sides of the large outer circle respectively, tip holes are formed in end faces of two sides of the small outer circle, and a notch plane is formed in the periphery of the large outer circle; the method is characterized in that: the processing method comprises the following specific steps:
step one, processing two end faces and a notch plane of the crosshead pin on a boring machine in a horizontal station
Use chain block axial positioning and radial locking cross head round pin work piece on V type location frock, accomplish following processing in proper order: machining all holes on the end face, machining the total length of the crosshead pin workpiece, roughly machining the notch plane and machining mounting process holes of lathe process inserts on the notch plane;
and step two, clamping the workpiece by adopting two centers on a lathe and processing a large excircle, a small excircle and each end face
Installing a lathe process insert on the plane of the notch, installing a transmission disc and a chuck tip on the chuck side of the lathe, installing a transmission rod on the end surface to drive the crosshead pin workpiece to rotate, clamping the crosshead pin workpiece by utilizing two tips of a lathe tailstock tip and the chuck tip, and finishing the rough and fine turning of the large outer circle, the small outer circle and the end surface of each gear, wherein the large outer circle and the small outer circle are left with grinding allowance;
step three, finely machining all holes on the notch plane and the circumference by a vertical station on a boring machine
Fixing the crosshead pin workpiece on a rotary worktable of a boring mill by utilizing equal-height cushion blocks, pressure plates, compression bolts, compression nuts and adjustable supports, and finely machining the notch plane and all holes on the circumference;
step four, grinding the large and small outer circles on the grinding machine in a supporting grinding mode
Placing the crosshead pin workpiece on a grinding machine bracket, installing a grinding machine transmission plate on the end face, connecting one end of a transmission cardan shaft with a machine tool chuck side, connecting the other end of the transmission cardan shaft with the grinding machine transmission plate, installing a grinding machine process insert on a notch plane, and grinding a large excircle and a small excircle;
step five, clamping the workpiece by two centers on a polishing lathe, and polishing the workpiece with the crosshead pin
And clamping the crosshead pin workpiece by adopting a two-center clamping mode which is the same as the second procedure, still installing the process insert of the grinding machine on the plane of the notch, and polishing the surface of the crosshead pin workpiece by using a polishing machine and abrasive paper until the requirement of a mirror surface is met.
Further, the V-shaped positioning tool in the first step includes two V-shaped side plates, a V-shaped opening for placing the crosshead pin workpiece is formed in the two V-shaped side plates, a positioning block for axially positioning the crosshead pin workpiece is disposed on the V-shaped side plates, and the position of the positioning block on the V-shaped side plates can be adjusted.
In the second step, the driving disc is fixed on a chuck of a lathe, the chuck tip is coaxially connected to the center of the driving disc, one end of the driving rod is connected with the chuck tip, and the other end of the driving rod is connected with the end surface of the crosshead pin workpiece through threads.
Further, the lathe process insert in the second process and the grinding machine process insert in the fourth process are both small semi-cylinders with the shapes corresponding to the notch planes.
The processing method mainly solves the following problems:
1. the new process method solves the problem of simultaneously processing the holes on the two end surfaces of the crosshead pin and the plane of the notch.
In order to reduce the number of working procedures of a lathe and the number of turning on and off, a clamping mode of two centers is required, and a clamping method of the two centers is also required to drive a workpiece to rotate by utilizing a technical screw hole on the end face. The V-shaped positioning tool and the chain block of the horizontal station of the boring machine are used for well solving the problem, the workpiece can be fixed in the axial direction by the V-shaped positioning tool, the workpiece can be locked in the circumferential radial direction by the chain block, and the processing of holes on two end faces, the rough processing of a notch plane and the processing of process screw holes on the notch plane can be completed simultaneously in one process. The traditional process method and the traditional tool do not solve the problem, and holes on two end surfaces cannot be machined even if a notch plane is not machined, so that a workpiece cannot be clamped by two centers for turning.
2. The new process method solves the problem of processing in the same procedure of rough turning and fine turning. Because the holes on the two end surfaces are processed in the previous working procedure, the workpiece can be turned by using the transmission disc, the chuck center and the transmission rod in a mode of two centers, and the finish turning of all the outer circles and the end surfaces can be realized. Meanwhile, the use of the turning process insert also solves the problem that the dynamic balance is influenced in turning processing due to the plane of the notch, and the turning precision is ensured.
3. The new process method solves the problem that two tip holes are required to be finely machined to be ground. The traditional process adopts top grinding to grind the workpiece, so that the requirement on a top hole is extremely high, otherwise, the grinding precision cannot be ensured; the novel process method utilizes the grinding machine bracket and the universal shaft, the grinding machine transmission plate drives the workpiece to rotate, the workpiece self-weight is utilized to realize stable rotation, the workpiece is not required to be positioned by using the center hole, the grinding precision can be well ensured, and the process of finish machining the center hole by using a vertical lathe is reduced. The grinding process insert installed during grinding ensures dynamic balance in the grinding rotation process and effectively ensures grinding precision.
Compared with the prior art, the invention has the beneficial effects that:
the traditional cross head pin processing method has 8 working procedures, 16 times of getting on and off are carried out totally, the working procedure route is long, the working steps of a single working procedure are multiple, the auxiliary time and the ineffective labor time occupy too much, and the processing efficiency is low. The invention has less working procedures and short process route, can complete the whole processing content of the cross head pin only by 5 working procedures, and each working procedure only needs to be carried out once and only needs to be carried out for 5 times in total, thereby greatly improving the processing efficiency of the cross head pin, reducing the labor intensity of operators and obtaining the effects of time saving and labor saving.
Drawings
Fig. 1 is a schematic view of a cross pin structure.
FIG. 2 is a schematic view of the horizontal station clamping of the boring machine.
Fig. 3 is a schematic view of the V-shaped positioning tool in the first step.
FIG. 4 is a schematic view of the clamping of a second process lathe.
FIG. 5 is a schematic view of the drive plate in step two.
Fig. 6 is a schematic view of the chuck center in the second step.
FIG. 7 is a schematic view of the actuator stem in step two.
FIG. 8 is a schematic view of the installation of the lathe process insert in step two.
FIG. 9 is a schematic view of vertical station clamping of a three-step boring machine.
FIG. 10 is a schematic view of the process four grinder clamping.
Fig. 11 is a schematic view of the installation of the process insert of the grinding machine in the fourth step.
Fig. 12 is a schematic view of the grinding machine drive plate in step four.
FIG. 13 is a schematic view of the clamping of a five-step buffing lathe.
FIG. 14 is a schematic flow diagram of a process of the present invention.
In the figure, 1-large outer circle, 2-small outer circle, 3-notched plane, 4-end face, 5-tip hole, 6-crosshead pin workpiece, 7-V type positioning tool, 71-V type side plate, 72-positioning block, 8-chain block, 9-lathe process insert, 10-driving disc, 11-chuck tip, 12-driving rod, 13-lathe tailstock tip, 14-lathe process insert mounting bolt, 15-boring machine rotary table, 16-compression bolt, 17-compression nut, 18-pressing plate, 19-adjustable support, 20-equal-height cushion block, 21-grinder process insert, 22-grinder driving plate, 23-universal shaft, 24-grinder bracket, 25-grinder tailstock tip, 26-grinding wheel, 27-positioning pin, 28-positioning pin mounting bolt, 29-grinder process insert mounting bolt, and 30-polishing big lathe tailstock tip.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific examples, but the scope of the present invention is not limited to the examples described below. All equivalent changes and modifications made according to the content of the present specification belong to the technical scope of the claimed invention.
The invention relates to a crosshead pin for processing a MAN series marine low-speed diesel engine, which comprises a large outer ring 1 and two small outer rings 2, wherein the two small outer rings 2 are coaxially connected to two sides of the large outer ring 1 respectively, tip holes 5 are arranged on end faces 4 of two sides of the small outer rings 2, and a notch plane 3 is arranged on the periphery of the large outer ring 1.
Referring to fig. 14, the method for manufacturing the MAN-series marine low-speed diesel engine crosshead pin includes five steps:
step one, processing two end faces and a notch plane of the crosshead pin on a boring machine in a horizontal station
The crosshead pin workpiece 6 is axially positioned on a V-shaped positioning tool 7 (see fig. 3), and the large outer circle 1 of the crosshead pin workpiece 6 is locked in the radial direction by using a chain block 8, and referring to fig. 2, the following processes are sequentially completed: all holes on two end surfaces 4 on a crosshead pin workpiece 6 are processed, the total length of the crosshead pin workpiece 6 is processed, a notch plane 3 is roughly processed, and mounting process holes of lathe process inserts 9 on the notch plane 3 are processed.
Referring to fig. 3, the V-shaped positioning tool 7 includes two V-shaped side plates 71, the two V-shaped side plates 71 form a V-shaped opening for placing the crosshead pin workpiece 6, a positioning block 72 for axially positioning the crosshead pin workpiece 6 is disposed on the V-shaped side plates 71, and the position of the positioning block 72 on the V-shaped side plates 71 can be adjusted.
And step two, clamping the workpiece by adopting two centers on a lathe and processing a large excircle, a small excircle and each end face
A transmission disc 10 (shown in figure 5) and a chuck tip 11 (shown in figure 6) are installed on the chuck side of the machine tool, a transmission rod 12 (shown in figure 7) is installed through a screw hole in the end face 4 of the crosshead pin workpiece 6 to drive the crosshead pin workpiece 6 to rotate, a lathe process insert 9 (shown in figure 8) is installed on the notch plane 3 through a lathe process insert installation bolt 14 to guarantee dynamic balance in the turning process, and the crosshead pin workpiece 6 is clamped in a lathe tailstock tip 13 and chuck tip 11 mode (shown in figure 4); and rough and fine turning of the large outer circle 1, the small outer circle 2 and each gear end face 4 of the crosshead pin workpiece 6 is completed at the station, and grinding allowance is left for the large outer circle 1 and the small outer circle 2.
The transmission disc 10 is fixed on a chuck of a lathe, the chuck center 11 is coaxially connected to the center of the transmission disc 10, one end of the transmission rod 12 is connected with the chuck center 11, and the other end of the transmission rod is connected with the end surface 4 of the crosshead pin workpiece 6 through threads.
The lathe process insert 9 is a small semi-cylinder, and the shape of the small semi-cylinder corresponds to that of the notch plane 3.
Step three, finely machining all holes on the notch plane and the circumference by a vertical station on a boring machine
The crosshead pin workpiece 6 is secured to the boring machine rotary table 15 by means of contour spacers 20, pressure plates 18, hold-down bolts 16, hold-down nuts 17 and adjustable supports 19 (see fig. 9), finish machining the notch plane 3 (in a split rough and finish form to prevent distortion of the notch plane 3), and machining all holes in the circumference.
Step four, grinding the large and small outer circles on the grinding machine in a supporting grinding mode
The method comprises the steps of placing a crosshead pin workpiece 6 on a grinding machine bracket 24 matched with a machine type, installing a grinding machine transmission plate 22 (shown in figure 12) on the end face 4 of the crosshead pin workpiece 6, connecting one end of a transmission universal shaft 23 with the side of a machine tool chuck, connecting the other end of the transmission universal shaft with the grinding machine transmission plate 22, installing a grinding machine process insert 21 (shown in figure 11) on a notch plane 3 by using a positioning pin 27, a positioning pin installation bolt 28 and a grinding machine process insert installation bolt 29, referring to figure 10, grinding a large excircle 1 and a small excircle 2 by using a grinding wheel 26 for the crosshead pin, and adjusting the crosshead pin workpiece 6 by using a grinding machine tailstock centre 25.
Step five, clamping the workpiece by two centers on a polishing lathe, and polishing the workpiece with the crosshead pin
The clamping mode is the same as the two centers in the second working procedure, the crosshead pin workpiece 6 is clamped by the chuck center 11 and the polishing cart tailstock center 30, the grinding machine process insert 21 is still installed on the notch plane 3 of the crosshead pin workpiece 6 to ensure the dynamic balance in the rotating process, and referring to fig. 13, the surface of the crosshead pin workpiece 6 is polished by a polishing machine and abrasive paper until the mirror surface requirement is met.
The grinding machine process insert 21 is a small semi-cylinder with a shape corresponding to the notch plane 3.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, but rather the appended claims should be construed to cover all such modifications and changes.
Claims (4)
1. A machining method of a crosshead pin of a low-speed diesel engine for MAN series ships comprises a large outer circle and two small outer circles, wherein the two small outer circles are coaxially connected to two sides of the large outer circle respectively, tip holes are formed in end faces of two sides of the small outer circle, and a notch plane is formed in the periphery of the large outer circle; the method is characterized in that: the processing method comprises the following specific steps:
step one, processing two end faces and a notch plane of the crosshead pin on a boring machine in a horizontal station
Through setting up the locating piece on V type location frock with cross head pin work piece axial location on this V type location frock to use chain block radial locking this cross head pin work piece, later accomplish following processing in proper order: machining all holes including the center hole on the end face, machining the total length of the crosshead pin workpiece, roughly machining the notch plane and machining an installation process hole of a lathe process insert on the notch plane;
and step two, clamping the workpiece by adopting two centers on a lathe and processing a large excircle, a small excircle and each end face
Installing a lathe process insert on the plane of the notch, installing a transmission disc and a chuck tip on the chuck side of the lathe, installing a transmission rod on the end surface to drive the crosshead pin workpiece to rotate, clamping the crosshead pin workpiece by utilizing two tips of a lathe tailstock tip and the chuck tip, and finishing the rough and fine turning of the large outer circle, the small outer circle and the end surface of each gear, wherein the large outer circle and the small outer circle are left with grinding allowance;
step three, finely machining all holes on the notch plane and the circumference by a vertical station on a boring machine
Fixing the crosshead pin workpiece on a rotary worktable of a boring mill by utilizing equal-height cushion blocks, pressure plates, compression bolts, compression nuts and adjustable supports, and finely machining the notch plane and all holes on the circumference;
step four, grinding the large and small outer circles on the grinding machine in a supporting grinding mode
Placing the crosshead pin workpiece on a grinding machine bracket, installing a grinding machine transmission plate on the end face, connecting one end of a transmission cardan shaft with a machine tool chuck side, connecting the other end of the transmission cardan shaft with the grinding machine transmission plate, installing a grinding machine process insert on a notch plane, and grinding a large excircle and a small excircle;
step five, clamping the workpiece by two centers on a polishing lathe, and polishing the workpiece with the crosshead pin
And clamping the crosshead pin workpiece by adopting a two-center clamping mode which is the same as the second procedure, still installing the process insert of the grinding machine on the plane of the notch, and polishing the surface of the crosshead pin workpiece by using a polishing machine and abrasive paper until the requirement of a mirror surface is met.
2. The method of manufacturing a MAN-series marine low-speed diesel engine crosshead pin according to claim 1, wherein: the V-shaped positioning tool in the first process comprises two V-shaped side plates, a V-shaped opening used for accommodating the crosshead pin workpiece is formed in each of the two V-shaped side plates, the positioning block is arranged on each of the V-shaped side plates and is used for axially positioning the crosshead pin workpiece, and the position of the positioning block on each V-shaped side plate can be adjusted.
3. The method of manufacturing a MAN-series marine low-speed diesel engine crosshead pin according to claim 1, wherein: in the second working procedure, the transmission disc is fixed on a chuck of a lathe, the chuck tip is coaxially connected to the center of the transmission disc, one end of the transmission rod is connected with the chuck tip, and the other end of the transmission rod is connected with the end face of the crosshead pin workpiece through threads.
4. The method of manufacturing a MAN-series marine low-speed diesel engine crosshead pin according to claim 1, wherein: and the lathe process insert in the second procedure and the grinding machine process insert in the fourth procedure are both small semi-cylinders with the shapes corresponding to the planes of the notches.
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| CN201811255338.6A CN109175913B (en) | 2018-10-26 | 2018-10-26 | Method for processing MAN series marine low-speed diesel engine crosshead pin |
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| CN201811255338.6A CN109175913B (en) | 2018-10-26 | 2018-10-26 | Method for processing MAN series marine low-speed diesel engine crosshead pin |
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| CN109175913B true CN109175913B (en) | 2020-08-28 |
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| CN109623445A (en) * | 2019-01-28 | 2019-04-16 | 苏州东方模具科技股份有限公司 | Glass mold processing built-up jig matched with machining center |
| CN112743444B (en) * | 2020-12-31 | 2022-02-25 | 沈阳鼓风机集团往复机有限公司 | Automatic grinding device |
| CN115156855B (en) * | 2022-07-28 | 2023-11-17 | 大连船用柴油机有限公司 | Machining method for cross head excircle of marine diesel engine |
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|---|---|---|---|---|
| US3812564A (en) * | 1972-07-26 | 1974-05-28 | Pennwalt Corp | Method of manufacturing a helical conveyor for a centrifuge |
| CN1160128A (en) * | 1996-03-14 | 1997-09-24 | 南通市黄海液压真空设备厂 | Technology for working rotor of Roots pump |
| CN104646942A (en) * | 2014-12-02 | 2015-05-27 | 王树林 | MC-type crosshead pin processing method |
| CN107855738A (en) * | 2017-11-16 | 2018-03-30 | 陕西启源科技发展有限责任公司 | MC type crosshead pin processing methods |
-
2018
- 2018-10-26 CN CN201811255338.6A patent/CN109175913B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3812564A (en) * | 1972-07-26 | 1974-05-28 | Pennwalt Corp | Method of manufacturing a helical conveyor for a centrifuge |
| CN1160128A (en) * | 1996-03-14 | 1997-09-24 | 南通市黄海液压真空设备厂 | Technology for working rotor of Roots pump |
| CN104646942A (en) * | 2014-12-02 | 2015-05-27 | 王树林 | MC-type crosshead pin processing method |
| CN107855738A (en) * | 2017-11-16 | 2018-03-30 | 陕西启源科技发展有限责任公司 | MC type crosshead pin processing methods |
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