CN105922090A - Grinding wheel rod for high precision inner hole processing and processing method - Google Patents
Grinding wheel rod for high precision inner hole processing and processing method Download PDFInfo
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- CN105922090A CN105922090A CN201610267760.8A CN201610267760A CN105922090A CN 105922090 A CN105922090 A CN 105922090A CN 201610267760 A CN201610267760 A CN 201610267760A CN 105922090 A CN105922090 A CN 105922090A
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- Prior art keywords
- emery wheel
- high precision
- segment
- grinding
- grinding wheel
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/36—Single-purpose machines or devices
- B24B5/48—Single-purpose machines or devices for grinding walls of very fine holes, e.g. in drawing-dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/35—Accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
Abstract
The invention discloses a grinding wheel rod for high precision inner hole processing and a processing method. The grinding wheel rod for high precision inner hole processing comprises a grinding wheel assembly section which is used for assembling a grinding wheel, stretches into a to-be-processed inner hole in the axial direction of the to-be-processed inner hole, and performs grinding processing on the inner wall surface of the to-be-processed inner hole through utilizing the grinding wheel, a guide section used for guiding the grinding wheel assembly section equipped with the grinding wheel to stretch into the to-be-processed inner hole, and a connecting section which is used for connecting with a driving device for rotary grinding, wherein the grinding wheel assembly section, the guide section and the connecting section are sequentially arranged in the axial direction of the grinding wheel rod; and a cooling liquid groove used for guiding cooling water to the grinding wheel assembly section to ensure that the grinding wheel is in full contact with a cooling liquid during the grinding process is formed in the outer surface of the guide section. According to the grinding wheel rod, burn and high temperature deformation of inner holes of parts are prevented, the situation that the inner holes do not meet the high precision requirement due to the problems that the grinding wheel rod deforms due to too high grinding temperature, and the like, is prevented, the final sizes of the inner holes of the parts can be guaranteed, and the grinding wheel rod is applicable to processing of inner holes, with various high precision requirements, of tubular structures.
Description
Technical field
The present invention relates to aero-engine high-precision part processing technique field, especially, relate to one and add for high precision inner-pore
The pole wheel of work.Moreover, it relates to a kind of aero-engine including the above-mentioned pole wheel for high precision inner-pore processing
By the high precision inner-pore processing method of part.
Background technology
Tubular member is the common part of aero-engine, and as aircraft engine parts, the inner hole precision of its tubular member
Require height.Such as being illustrated in figure 2 the tubular member that a kind of inner hole precision is high, as a example by this part, the inner hole precision of part is non-
Normal height, tolerance only 0.012, roughness requirements 0.4, cylindricity 0.005, use conventional method that endoporus is carried out grinding and i.e. adopt
With the wheel grinding endoporus less than diameter 5.9, following several problem can be there is:
1, part Surface Burning in Grinding；
2, inner bore of part grinding temperature raises inner bore of part deformation；
3, the part band cone processed, causes endoporus to be unable to reach design requirement.
Summary of the invention
The invention provides the high precision inner-pore processing of a kind of pole wheel for high precision inner-pore processing and aero-engine part
Method, to solve the method for machining bore of existing conventional tubular part, can make inner bore of part there is burn, high temperature deformation etc. and ask
Topic, the final size of part is difficult to guaranteed technical problem.
According to an aspect of the present invention, it is provided that a kind of pole wheel for high precision inner-pore processing, including for assembling emery wheel also
Utilize in axially stretching into endoporus to be processed along endoporus to be processed emery wheel carry out endoporus internal face to be processed grinding emery wheel assembling
Section, for guiding band to stretch into the boot segment of endoporus to be processed and for connecting driving means to enter equipped with the emery wheel load segment of emery wheel
Row rotates the linkage section of grinding, and emery wheel load segment, boot segment and linkage section are arranged the most successively along pole wheel；The appearance of boot segment
Face offers in grinding process and cooling water is guided emery wheel load segment so that the cooling liquid bath that is fully contacted of emery wheel and coolant.
Further, position boot segment contacted with linkage section is provided with the locating part stretching into distance for limiting boot segment.
Further, cooling liquid bath along spiral distribution in the outer surface of boot segment the two ends of through boot segment so that coolant
Grinding process is supplied in the shape of a spiral to emery wheel along cooling liquid bath and is fully contacted with emery wheel.
Further, locating part uses the cone pyramidal structure towards boot segment.
Further, cooling liquid bath extends to the outer surface of locating part.
Further, the arc caved inward is used to seamlessly transit structure between locating part and boot segment；And/or boot segment and emery wheel
The arc caved inward is used to seamlessly transit structure between load segment.
Further, the radial dimension of emery wheel load segment is less than the radial dimension of boot segment.
Further, interference fit is used to connect between emery wheel load segment, boot segment and linkage section three；Or emery wheel load segment,
Threaded engagement is used to connect between boot segment and linkage section three；Or emery wheel load segment, boot segment and linkage section three use one
System makees the overall structure of molding.
Further, the radial dimension of boot segment 1mm-3mm less than the radial dimension of endoporus to be processed；The axial length of boot segment
The 1/2 axial dimension length more than endoporus to be processed.
According to a further aspect in the invention, additionally provide the high precision inner-pore processing method of a kind of aero-engine part, use
Above-mentioned pole wheel, comprises the following steps: a, be assembled to emery wheel on emery wheel load segment and guided by emery wheel by boot segment stretch into and treat
Processing endoporus；B, carry out roughly grinding and persistently inject cooling water by cooling liquid bath；C, carry out half corase grind and by cooling liquid bath continue
Inject cooling water；D, carry out refining and persistently inject cooling water by cooling liquid bath；E, completion of processing, it is thus achieved that have in high accuracy
The part in hole.
Further, during fine grinding, each feed 0.001mm-0.003mm, the processing a diameter of 0.04mm-0.06mm's of diameter is remaining
Amount；When partly refining, each feed 0.001mm-0.003mm, processes the surplus of a diameter of 0.03；During fine grinding, each feed
0.0005mm-0.002mm, processes the surplus of a diameter of 0.01mm-0.022.
The method have the advantages that
The present invention, for the pole wheel of high precision inner-pore processing, uses three stage structure design, utilizes boot segment to carry out stretching into part
The guiding of endoporus to be processed, to prevent from occurring interaction force to cause parts depreciation between pole wheel and part wall body.Utilize
The emery wheel being assemblied in emery wheel load segment carries out grinding to the internal face of the endoporus to be processed of part, thick to half to complete from corase grind
It is ground to the grinding process of fine grinding.By offering the cooling liquid bath for carrying coolant at the outer surface of boot segment so that in grinding
In the course of processing, coolant cooling liquid bath along the outside wall surface of boot segment can be transferred to the sand that is assemblied on emery wheel load segment in time
Wheel position so that emery wheel all sufficiently can contact with coolant during carrying out inner hole grinding, to prevent inner bore of part
Burn, the problem such as high temperature deformation, also be able to prevent simultaneously pole wheel due to grinding temperature is too high and the problem such as be deformed causes
Endoporus is unable to reach high-precision requirement, so that the final size of inner bore of part can be ensured.By linkage section and driving
Device is attached, thus realizes the transmission of moment of torsion, and convenient connection and grinding control.It is applicable to the tubulose of various high-precision requirement
The interior hole machined of structure.
In addition to objects, features and advantages described above, the present invention also has other objects, features and advantages.Below
Will be with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
The accompanying drawing of the part constituting the application is used for providing a further understanding of the present invention, the illustrative examples of the present invention and
Its explanation is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of the pole wheel of the preferred embodiment of the present invention；
Fig. 2 is the structural representation of the tubular member of the high precision inner-pore of the preferred embodiment of the present invention；
Fig. 3 is the steps flow chart block diagram of the high precision inner-pore processing method of the aero-engine part of the preferred embodiment of the present invention.
Marginal data:
1, emery wheel load segment；2, boot segment；3, linkage section；4, cooling liquid bath；5, endoporus to be processed；6, locating part；7、
Arc seamlessly transits structure.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the present invention can by following be limited and covered
Multitude of different ways is implemented.
Fig. 1 is the structural representation of the pole wheel of the preferred embodiment of the present invention；In Fig. 2 is the high accuracy of the preferred embodiment of the present invention
The structural representation of the tubular member in hole；Fig. 3 is that the high precision inner-pore of the aero-engine part of the preferred embodiment of the present invention adds
The steps flow chart block diagram of work method.
As it is shown in figure 1, the pole wheel for high precision inner-pore processing of the present embodiment, including for assembling emery wheel and along to be processed
Endoporus 5 utilize in axially stretching into endoporus 5 to be processed emery wheel carry out endoporus 5 internal face to be processed grinding emery wheel load segment 1,
For guide band equipped with the emery wheel load segment 1 of emery wheel stretch into endoporus 5 to be processed boot segment 2 and for connect driving means with
Carrying out rotating the linkage section 3 of grinding, emery wheel load segment 1, boot segment 2 and linkage section 3 are arranged the most successively along pole wheel；Guide
The outer surface of section 2 offers, in grinding process, cooling water is guided emery wheel load segment 1 so that emery wheel is fully contacted with coolant
Cooling liquid bath 4.The present invention, for the pole wheel of high precision inner-pore processing, uses three stage structure design, utilizes boot segment 2 to enter
Row stretches into the guiding of the endoporus to be processed 5 of part, to prevent from occurring interaction force to cause zero between pole wheel and part wall body
Part weares and teares.Utilize the emery wheel being assemblied in emery wheel load segment 1 that the internal face of the endoporus to be processed 5 of part is carried out grinding, with
Complete from corase grind to half corase grind to the grinding process of fine grinding.By offering for carrying the cold of coolant at the outer surface of boot segment 2
But liquid bath 4 so that in Grinding Process, coolant can cooling liquid bath 4 along the outside wall surface of boot segment 2 be transferred in time
The emery wheel position being assemblied on emery wheel load segment 1 so that emery wheel all can fill with coolant during carrying out inner hole grinding
The contact divided, to prevent the problems such as the burn of inner bore of part, high temperature deformation, also is able to prevent pole wheel due to grinding temperature simultaneously
Too high and the problem such as be deformed causes endoporus to be unable to reach high-precision requirement, so that the final size of inner bore of part can obtain
To ensure.Being attached with driving means by linkage section 3, thus realize the transmission of moment of torsion, convenient connection and grinding control.
It is applicable to the interior hole machined of the tubular structure of various high-precision requirement.Alternatively, emery wheel outer surface also offers cooling liquid bath.With
Facilitate coolant to transmit along emery wheel outer surface, thus ensure that emery wheel coolant in grinding engineering is fully contacted with emery wheel, anti-
Stop the problems such as the burn of inner bore of part, high temperature deformation.Alternatively, cooling liquid bath and boot segment 2 outer surface of emery wheel outer surface
Cooling liquid bath is connected, or the cooling liquid bath of emery wheel outer surface does not connects with the cooling liquid bath of boot segment 2 outer surface.Wherein,
High accuracy refers in aircraft engine parts making field, and the required precision to part processing reaches one decimal place number even three
Four figures, is the relative concept for the part processing precision in standard machinery field.
As depicted in figs. 1 and 2, in the present embodiment, the position that boot segment 2 contacts with linkage section 3 is provided with for limiting guiding
The locating part 6 stretching into distance of section 2.
As it is shown in figure 1, in the present embodiment, cooling liquid bath 4 along spiral distribution in the outer surface of boot segment 2 through boot segment 2
Two ends so that coolant in grinding process along cooling liquid bath 4 supply in the shape of a spiral to emery wheel and be fully contacted with emery wheel.
As it is shown in figure 1, in the present embodiment, locating part 6 uses cone towards the pyramidal structure of boot segment 2.Facilitate grinding,
Facilitate structure spacing, and by cooperating between locating part 6 and the endoporus to be processed 5 of pyramidal structure, it is possible to realize sand
Wheel bar is relative to the automatic centering of endoporus.
As it is shown in figure 1, in the present embodiment, cooling liquid bath 4 extends to the outer surface of locating part 6.Make coolant the most through
In boot segment 2 and the outer surface of locating part 6 so that pole wheel emery wheel at grinding position in grinding process can enter with coolant
Row sufficiently contact, to prevent the problems such as the burn of inner bore of part, high temperature deformation.Locating part 6 be prevented from coolant to driving
Dynamic device is revealed, can enable simultaneously coolant along cooling liquid bath 4 back and forth movement, to realize grinding position and extraneous heat friendship
Change, thus save the consumption of coolant.
As it is shown in figure 1, in the present embodiment, use the arc caved inward to seamlessly transit structure 7 between locating part 6 and boot segment 2；
And/or between boot segment 2 and emery wheel load segment 1, use the arc caved inward to seamlessly transit structure 7.Pole wheel is facilitated to enter into
In inner bore of part, it is possible to reduce the interaction force between pole wheel and part, also be able to realize pole wheel relative to endoporus simultaneously
Automatic centering, thus improve the precision of inner hole grinding.The arc caved inward is used between boot segment 2 and emery wheel load segment 1
Seamlessly transit structure 7, form the installation constitution of taper, it is possible to facilitate the control of the assembly precision of emery wheel.
As it is shown in figure 1, in the present embodiment, the radial dimension of emery wheel load segment 1 is less than the radial dimension of boot segment 2.Conveniently stretch
Enter the guiding of endoporus；Facilitate the assembling of emery wheel and spacing.
As it is shown in figure 1, in the present embodiment, use interference fit between emery wheel load segment 1, boot segment 2 and linkage section 3 three even
Connect；Or use threaded engagement to connect between emery wheel load segment 1, boot segment 2 and linkage section 3 three；Or emery wheel load segment 1,
Boot segment 2 and linkage section 3 three use the overall structure of integral production molding.Different connected modes can be used according to endoporus.
Use the mode of assembling to be attached between emery wheel load segment 1, boot segment 2 and linkage section 3, different shaped can be selected according to endoporus
Number emery wheel load segment 1, boot segment 2 and linkage section 3, thus meet the processing needs of different endoporus.Use integral production molding
Overall structure, good integrity.
As it is shown in figure 1, in the present embodiment, the radial dimension of boot segment 2 is than the little 1mm-3mm of radial dimension of endoporus 5 to be processed.
Thus meet the rigidity needs of pole wheel, also make pole wheel to be adequately cooled simultaneously.The axial length of boot segment 2
The 1/2 axial dimension length more than endoporus 5 to be processed.The processing of endoporus can be realized from part two ends, thus be adapted to through
Inner hole grinding is processed.
As shown in Figure 1, Figure 2 and Figure 3, the high precision inner-pore processing method of the aero-engine part of the present embodiment, in employing
State pole wheel, comprise the following steps: a, emery wheel is assembled on emery wheel load segment 1 and by boot segment 2 by emery wheel guide stretch into
Endoporus 5 to be processed；B, carry out roughly grinding and is persistently injected by cooling liquid bath 4 and cool down water；C, carry out half corase grind and pass through coolant
Groove 4 persistently injects cooling water；D, carry out refining and is persistently injected by cooling liquid bath 4 and cool down water；E, completion of processing, it is thus achieved that tool
There is the part of high precision inner-pore.The application of the invention processing method, the qualification rate of high precision inner-pore processing is more than 95%, greatly
Improve greatly the qualification rate of part.The improvement of pole wheel, not only increases the efficiency of processing, it is often more important that more stable guarantor
Demonstrate,prove the quality of part.
As shown in Figure 1, Figure 2 and Figure 3, in the present embodiment, during fine grinding, each feed 0.001mm-0.003mm, processes diameter
The surplus of a diameter of 0.04mm-0.06mm；When partly refining, each feed 0.001mm-0.003mm, processes a diameter of 0.03
Surplus；During fine grinding, each feed 0.0005mm-0.002mm, processes the surplus of a diameter of 0.01mm-0.022.By making
Processing method of the present invention, the qualification rate of high precision inner-pore processing is used more than 95%, to substantially increase the qualification rate of part.Emery wheel
The improvement of bar, not only increases the efficiency of processing, it is often more important that the more stable quality that ensure that part.
During enforcement, the processing method of high precision inner-pore, i.e. first special special grinding wheel bar, prevents from adding the interference of part in man-hour, deformation
And burn, reenact special grinding parameter and step: 1, roughly grind each feed 0.002, the surplus of processing diameter 0.05；2、
Partly refine each feed 0.002, the surplus of processing diameter 0.03；3, refine each feed 0.001, process diameter 0.01-0.022
Surplus.
Grinding concretely comprises the following steps: first radially part is fixed location along part, axial along inner bore of part by pole wheel
Stretching in endoporus, be continually fed into coolant, coolant is along the inner through hole of grinding part during cooling liquid bath constant flow；Grinding again
Variable cross-section hole wall in endoporus；Then the enlarging at inner hole grinding both ends open position；Part is vertically fixed location,
Along the radial aperture of part, form the lateral perforate along part radially inner through hole, thus form tubulose high precision inner-pore part.
When tubular member axial dimension is excessive, pole wheel is used respectively endoporus to be carried out grinding from endoporus two ends.
If coolant, machined surface can be burnt, or the too high deformation of temperature, this pole wheel specialized designs cooling liquid bath,
Ensure that coolant can be fully contacted.Bar portion to ensure enough rigidity, and this part is the endoporus of φ 6, and pole wheel is φ 5.Emery wheel
Groove size is moderate, the least if cool down insufficient, too big if rigidity bad.According to the thickness of pole wheel, determine coarse-fine adding
The depth of cut of work, bullet is sent out due to the most excessive bar portion by anti-stopping bar portion.
High-precision endoporus must use the method for grinding to can be only achieved requirement, and inner hole grinding requires higher, in should ensureing
The rigidity of hole fine grinding wheel bar, ensure again inner bore of part will not burn, high temperature deformation, the problem such as band cone, the final size of part
Just can be ensured.How the problem that present invention mainly solves: during high precision inner-pore grinding, ensure that part is without burn deformation, nothing
Band is bored, and ensures high-precision processing request simultaneously.
The application of the invention processing method, the qualification rate of high precision inner-pore processing, more than 95%, substantially increases the conjunction of part
Lattice rate.Facts have proved: such improvement, not only increase the efficiency of processing, it is often more important that more stable ensure that part
Quality.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for those skilled in the art
For, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any amendment of being made, etc.
With replacement, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. the pole wheel for high precision inner-pore processing, it is characterised in that
Emery wheel is utilized including in assembling emery wheel and axially stretching into described endoporus to be processed (5) along endoporus to be processed (5)
Carry out the emery wheel load segment (1) of the grinding of described endoporus to be processed (5) internal face, for guiding band equipped with emery wheel
Emery wheel load segment (1) stretches into the boot segment (2) of described endoporus to be processed (5) and is used for connecting driving means to carry out
Rotate the linkage section (3) of grinding,
Described emery wheel load segment (1), described boot segment (2) and described linkage section (3) are arranged the most successively along pole wheel；
The outer surface of described boot segment (2) offers, in grinding process, cooling water is guided described emery wheel load segment (1)
So that the cooling liquid bath (4) that emery wheel and coolant are fully contacted.
Pole wheel for high precision inner-pore processing the most according to claim 1, it is characterised in that
The upper position contacted with described linkage section (3) of described boot segment (2) is provided with for limiting described boot segment (2)
Stretch into the locating part (6) of distance.
Pole wheel for high precision inner-pore processing the most according to claim 2, it is characterised in that
Described cooling liquid bath (4) along spiral distribution in the outer surface of described boot segment (2) through described boot segment (2)
Two ends so that coolant is supplied in the shape of a spiral to emery wheel along described cooling liquid bath (4) in grinding process and fills with emery wheel
Tap is touched.
Pole wheel for high precision inner-pore processing the most according to claim 2, it is characterised in that
Described locating part (6) uses the cone pyramidal structure towards described boot segment (2)；Described cooling liquid bath (4) is prolonged
Extend the outer surface of described locating part (6).
5. according to the pole wheel for high precision inner-pore processing according to any one of claim 2 to 4, it is characterised in that
The arc caved inward is used to seamlessly transit structure (7) between described locating part (6) and described boot segment (2)；
And/or
The arc caved inward is used to seamlessly transit structure (7) between described boot segment (2) and described emery wheel load segment (1).
Pole wheel for high precision inner-pore processing the most according to any one of claim 1 to 4, it is characterised in that
The radial dimension of described emery wheel load segment (1) is less than the radial dimension of described boot segment (2).
Pole wheel for high precision inner-pore processing the most according to any one of claim 1 to 4, it is characterised in that
Interference fit is used between described emery wheel load segment (1), described boot segment (2) and described linkage section (3) three
Connect；Or
Threaded engagement is used between described emery wheel load segment (1), described boot segment (2) and described linkage section (3) three
Connect；Or
Described emery wheel load segment (1), described boot segment (2) and described linkage section (3) three use integral production molding
Overall structure.
Pole wheel for high precision inner-pore processing the most according to any one of claim 1 to 4, it is characterised in that
The radial dimension of described boot segment (2) is than the little 1mm-3mm of radial dimension of described endoporus to be processed (5)；
The axial length of described boot segment (2) is more than 1/2 axial dimension length of described endoporus to be processed (5).
9. a high precision inner-pore processing method for aero-engine part,
Use the pole wheel according to any one of claim 1 to 8,
It is characterized in that, comprise the following steps:
A, that emery wheel is assembled to emery wheel load segment (1) is upper and guided by emery wheel by boot segment (2) and stretch into endoporus to be processed
(5)；
B, carry out roughly grinding and is persistently injected by cooling liquid bath (4) and cool down water；
C, carry out half corase grind and by cooling liquid bath (4) persistently injects cool down water；
D, carry out refining and is persistently injected by cooling liquid bath (4) and cool down water；
E, completion of processing, it is thus achieved that there is the part of high precision inner-pore.
The high precision inner-pore processing method of aero-engine part the most according to claim 9, it is characterised in that
During fine grinding, each feed 0.001mm-0.003mm, the surplus of the processing a diameter of 0.04mm-0.06mm of diameter；
When partly refining, each feed 0.001mm-0.003mm, processes the surplus of a diameter of 0.03；
During fine grinding, each feed 0.0005mm-0.002mm, processes the surplus of a diameter of 0.01mm-0.022.
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| CN201610267760.8A CN105922090B (en) | 2016-04-27 | 2016-04-27 | Pole wheel and processing method for high precision inner-pore processing |
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| CN201610267760.8A CN105922090B (en) | 2016-04-27 | 2016-04-27 | Pole wheel and processing method for high precision inner-pore processing |
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| CN203600087U (en) * | 2013-10-10 | 2014-05-21 | 上海鑫轮超硬磨具有限公司 | CBN inner circle high speed grinding wheel based on hard alloy rod |
| CN104400123A (en) * | 2014-10-20 | 2015-03-11 | 郑州市钻石精密制造有限公司 | Spiral guide air valve conduit reamer |
| CN104329257A (en) * | 2014-10-28 | 2015-02-04 | 马德宝真空设备集团有限公司 | Screw rotor cooling device of screw vacuum pump |
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