CN115256211A - Honing cutter special for valve body parts and assembling method thereof - Google Patents
Honing cutter special for valve body parts and assembling method thereof Download PDFInfo
- Publication number
- CN115256211A CN115256211A CN202210984335.6A CN202210984335A CN115256211A CN 115256211 A CN115256211 A CN 115256211A CN 202210984335 A CN202210984335 A CN 202210984335A CN 115256211 A CN115256211 A CN 115256211A
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- honing
- connecting rod
- tail handle
- valve body
- pin
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000009434 installation Methods 0.000 claims description 12
- 238000003825 pressing Methods 0.000 claims description 5
- 238000003754 machining Methods 0.000 abstract description 8
- 238000005520 cutting process Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 230000007704 transition Effects 0.000 description 3
- 238000011900 installation process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Classifications
-
- 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
- B24B33/00—Honing machines or devices; Accessories therefor
- B24B33/08—Honing tools
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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
- B24B33/00—Honing machines or devices; Accessories therefor
- B24B33/02—Honing machines or devices; Accessories therefor designed for working internal surfaces of revolution, e.g. of cylindrical or conical shapes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention relates to the technical field of machining, in particular to a special honing cutter for valve body parts and an assembling method thereof, and the special honing cutter comprises a tail handle, a connecting rod and a cutter body, wherein the connecting rod is sleeved in a guide groove of the tail handle and is provided with a pressure spring, the upper end of the connecting rod is in clearance fit with the guide groove, the side surface of the tail handle is also provided with a strip-shaped groove, a pin is arranged on the connecting rod, the head of the pin can slide in the strip-shaped groove along the radial direction, the tail handle is also provided with a detachable sheath which covers the strip-shaped groove, and the cutter body is fixedly connected to the lower end of the connecting rod.
Description
Technical Field
The invention relates to the technical field of machining, in particular to a honing cutter special for valve body parts and an assembling method thereof.
Background
Honing, also called boring and honing, is a finishing process for finishing a finish-machined surface with a whetstone (also called honing bar) mounted on a honing head. Under the current situation, a plurality of valve body parts are processed by orifice honing chamfers, a piston in a valve body needs to reciprocate thousands of times, a chamfer surface is used as a valve body sealing surface, the requirement on processing precision is high, when a honing cutter is used for drilling, the honing cutter needs to be slowly lowered, if the cutter and the hole deviate, the hole which is difficult to be drilled can be deformed, the cutter handle of the conventional honing cutter basically achieves radial floating of a front-end cutter, but the defect that the axial direction is a rigid structure exists, and in actual production, the size of the processed chamfers is different due to the fact that the size of the machined chamfers is difficult to control when the cutter is used for processing the orifice chamfers.
The honing cutter with the floating structure is also used for machining other parts in the prior art, and is not suitable for machining valve body parts, and the honing cutter is complex in structure and inconvenient to assemble.
Disclosure of Invention
The invention solves the problems that: in the prior art, the axial force is difficult to control when the cutter is used for processing the orifice chamfer, so that the processed chamfers are different in size, and the honing cutter is inconvenient to disassemble and assemble.
The honing tool special for the valve body parts comprises a tail handle, a connecting rod and a tool body, wherein the upper end of the connecting rod is coaxially sleeved in a guide groove of the tail handle, a pressure spring is arranged in the guide groove, two ends of the pressure spring are respectively abutted against the tail handle and the connecting rod, the upper end of the connecting rod is in clearance fit with the guide groove, a strip-shaped groove is further formed in the side surface of the tail handle and communicated with the guide groove, a pin hole is formed in the connecting rod, a pin is mounted on the pin hole, the head of the pin is milled flat to form a parallel shape, the head of the pin can slide in the strip-shaped groove in the radial direction, the head of the pin is in clearance fit with the strip-shaped groove, a detachable sheath is further arranged on the tail handle and covers the strip-shaped groove, and the lower end of the connecting rod is fixedly connected with the tool body.
In the scheme, when the honing tool disclosed by the invention is used for machining, the main shaft is fed until the tool body is just contacted with the orifice chamfer of the valve body, then the main shaft is continuously fed for a certain distance to compress the pressure spring, the axial reaction force of the pressure spring is utilized to push against the connecting rod, and honing is carried out under a certain pressure in the feeding direction, so that the honing effect can be ensured, the phenomenon of excessive honing cannot occur, the connecting rod and the tail handle are in clearance fit, the pressure spring is axially adopted, the position of the inner hole of the valve body is greatly contained, the influence of machining errors of other procedures cannot be caused, and the high precision of orifice chamfer honing is ensured.
Further, the cutter body includes installation department, honing sword oral area, honing guide, the lower extreme that connects the pole and the installation department of cutter body adopt the side to connect admittedly, the installation department is provided with mills flat inclined plane, the lower extreme that connects the pole is provided with the screw and locks the inclined plane, honing guide and the interior hole clearance fit of the body of rod, be provided with the changeover portion between honing guide and the honing sword portion, the changeover portion diameter is less than the honing guide, honing sword oral area is the conical surface, and its blade leans out the extension from the changeover portion, and the honing guide utilizes the valve body hole to lead, ensures that honing sword oral area and drill way chamfer are coaxial, and the honing effect is better. The cutting edge extends obliquely outwards from the transition section, so that the cutting edge of the honing cutting edge part completely covers the orifice chamfer, and honing omission parts are prevented.
Further, in order to ensure that the cutter body has good radial floating, the gap between the upper end of the connecting rod and the guide groove is 0.4-0.5mm.
Further, in order to conveniently take down the pin when the honing tool is disassembled, the tail handle is further provided with an ejection hole, the ejection hole is located on the back face of the strip-shaped groove, when the extension rod extends out to the maximum extent, the ejection hole is communicated with the pin hole, and when the honing tool is disassembled, a tool is adopted to extend into the ejection hole, so that the pin is conveniently ejected out from the other end.
Furthermore, in order to facilitate the disassembly and assembly of the sheath, the upper end of the sheath abuts against the step surface of the tail handle, the lower end of the sheath is fixed by a shaft retainer ring, and the shaft retainer ring is semi-sunk into a retainer ring groove arranged on the tail handle.
In practical application, in order to facilitate the disassembly and assembly of the sheath, the inner diameter of the sheath is larger than the outer diameter of the lower half part of the connecting rod.
Furthermore, in order to prevent the pressure spring from deviating, a first spring limiting groove is formed in the upper opening of the connecting rod, a second spring limiting groove is formed in the guide groove of the tail handle, and two ends of the pressure spring are respectively arranged in the first spring limiting groove and the second spring limiting groove.
Further, in order to adjust the pre-pressing force of the pressure spring, a backing plate is arranged in the first spring limiting groove or the second spring limiting groove and abuts against the end face of the pressure spring, and the thickness of the backing plate can be replaced by various specifications.
Further, under the condition that the extension rod extends to the longest extent, the pre-pressing force of the pressure spring is 50-200N, and the elastic coefficient of the pressure spring is 2-15N/mm.
In another aspect of the invention, an assembling method of a honing cutter special for valve body parts is provided, which comprises the following steps:
the method comprises the following steps that firstly, a spring is arranged between a connecting rod and a tail handle, and the upper end of the connecting rod is inserted into a guide groove of the tail handle;
step two, adjusting the rotation direction of the connecting rod to enable the angles of the pin holes and the strip-shaped grooves to be consistent;
step three, applying thrust to enable the connecting rods to extend inwards and expose the pins from the strip-shaped grooves;
inserting the pin holes and withdrawing the thrust;
step five, sleeving a sheath on the tail handle, wherein the upper end of the sheath is abutted against the step surface of the tail handle;
step six, installing a check ring for a shaft in a check ring groove of the tail handle, wherein the lower end of the sheath is blocked by the check ring for the shaft;
and seventhly, inserting the mounting part of the cutter body into the lower opening of the connecting rod, and screwing the screw which is obliquely arranged on the connecting rod.
The invention has the beneficial effects that:
1. when the honing cutter disclosed by the invention is used for honing the orifice chamfer of the valve body part, the main shaft is fed, the honing guide part of the cutter body extends into the inner hole of the valve body for guiding, the main shaft is continuously fed until the honing cutting edge part of the cutter body is just contacted with the orifice chamfer of the valve body, then the main shaft is continuously fed for a certain distance, so that the pressure spring is compressed, the axial reaction force of the pressure spring is utilized to prop against the connecting rod, and honing is carried out under a certain pressure in the feeding direction, so that the honing effect can be ensured, and the phenomenon of over-honing can not occur.
2. According to the invention, the connecting rod and the tail handle are in clearance fit to realize radial floating connection, and the pressure spring is axially adopted for axial floating connection, so that the position of the inner hole of the valve body is greatly contained, the influence of processing errors of other procedures is avoided, and the high precision of orifice chamfer honing is ensured.
3. According to the invention, the tail handle and the connecting rod are in limited sliding connection by adopting the pin and the strip-shaped groove, the strip-shaped groove is shielded by adopting the sheath to ensure that the pin cannot be disengaged, the sheath is fixed by adopting the retaining ring for the shaft, the connecting rod and the cutter body are in side-fixed connection, and the whole installation process is in annular buckling, but the disassembly and assembly process is simple, and the rapid assembly can be realized.
4. The conventional honing cutter can achieve higher processing precision only by being matched with an imported machine tool, and the honing cutter disclosed by the invention can achieve very high honing precision by adopting a domestic machine tool, can replace the imported machine tool and reduce the manufacturing cost.
Drawings
FIG. 1 is a schematic structural view of a tail shank and a connecting rod according to the present invention;
FIG. 2 is a schematic structural view of a cutter body according to the present invention;
fig. 3 is a schematic view of the processing of the honing tool special for valve body parts of the invention.
In the figure: 1, a tail handle; 101 a guide groove; 102 a strip-shaped groove; 103 ejection holes; 104 a first spring retaining groove; 2, connecting a rod; 201 pin holes; 202 a second spring retaining groove; 3, a cutter body; 301 an installation part; 302 honing the edge opening part; 303 honing the guide; 304 a transition section; 4 a pressure spring; 5, pins; 6, sheathing; 7 a retainer ring for a shaft; 8 backing plates.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-3, a honing tool special for valve body parts comprises a tail handle 1, a connecting rod 2 and a tool body 3, wherein the upper end of the connecting rod 2 is coaxially sleeved in a guide groove 101 of the tail handle 1, a pressure spring 4 is arranged in the guide groove 101, two ends of the pressure spring 4 are respectively abutted against the tail handle 1 and the connecting rod 2, the upper end of the connecting rod 2 and the guide groove 101 are in clearance fit, a strip-shaped groove 102 is further formed in the side surface of the tail handle 1, the strip-shaped groove 102 is communicated with the guide groove 101, a pin hole 201 is formed in the connecting rod 2, a pin 5 is mounted on the pin hole 201, the head of the pin 5 is milled flat to form a parallel shape, the head of the pin 5 can slide in the strip-shaped groove 102 in the radial direction, the head of the pin 5 is in clearance fit with the strip-shaped groove 102, the tail handle 1 is further provided with a detachable sheath 6, the strip-shaped groove 102 is covered by the sheath 6, and the lower end of the connecting rod 2 is fixedly connected with the tool body 3.
In the scheme, when the honing cutter disclosed by the invention is used for machining, the main shaft is fed until the cutter body 3 is just contacted with the chamfer of the orifice of the valve body, then the main shaft is continuously fed for a certain distance, so that the pressure spring 4 is compressed, the axial reaction force of the pressure spring 4 is utilized to push the connecting rod 2, honing is carried out under a certain pressure in the feeding direction, the honing effect can be ensured, the phenomenon of over honing cannot occur, the connecting rod 2 is in clearance fit with the tail handle 1, the pressure spring 4 is axially adopted, the position of the inner hole of the valve body is greatly contained, the influence of machining errors of other procedures cannot be caused, and the high precision of orifice chamfer honing is ensured.
In practical application, cutter body 3 includes installation department 301, honing cutting edge portion 302, honing guide 303, connect the lower extreme of pole 2 and installation department 301 of cutter body 3 to adopt the side to connect admittedly, installation department 301 is provided with mills flat inclined plane, the lower extreme that connects pole 2 is provided with the screw and locks the inclined plane, honing guide 303 and the body of rod hole clearance fit, be provided with changeover portion 304 between honing guide 303 and the honing cutting edge portion 302, changeover portion 304 diameter is less than honing guide 303, honing cutting edge portion 302 is the conical surface, and its blade leans out from changeover portion 304 and extends, and honing guide 303 utilizes the valve body hole to lead, ensures that honing cutting edge portion 302 and drill way chamfer are coaxial, and the honing effect is better. The edge extends obliquely outward from the transition section 304, ensuring that the edge of the honing edge 302 completely covers the bore chamfer, ensuring that no honing missing parts will occur.
In practice, in order to ensure a good radial floating of the cutter body 3, the gap between the upper end of the extension rod 2 and the guide groove 101 is 0.4-0.5mm.
In practical application, in order to conveniently take down the pin when the honing tool is disassembled, the tail handle 1 is further provided with an ejection hole 103, the ejection hole 103 is located on the back surface of the strip-shaped groove 102, when the extension rod 2 extends out to the maximum, the ejection hole 103 is communicated with the pin hole 201, and when the extension rod 2 extends into the ejection hole 103 by using a tool, the pin 5 is conveniently ejected out from the other end.
In practical application, in order to facilitate the detachment and installation of the sheath 6, the upper end of the sheath 6 abuts against the step surface of the tail handle 1, the lower end of the sheath 6 is fixed by a shaft retainer ring 7, and the shaft retainer ring 7 is semi-sunk into a retainer ring groove arranged on the tail handle 1.
In practical application, in order to facilitate the detachment and installation of the sheath 6, the inner diameter of the sheath 6 is larger than the outer diameter of the lower half part of the extension rod 2.
In practical application, in order to prevent the pressure spring 4 from deviating, a first spring limiting groove 104 is arranged at the upper opening of the extension rod 2, a second spring limiting groove 202 is arranged in the guide groove 101 of the tail handle 1, and two ends of the pressure spring 4 are respectively arranged in the first spring limiting groove 104 and the second spring limiting groove 202.
In practical application, in order to adjust the magnitude of the pre-pressing force of the pressure spring 4, a backing plate 8 is arranged in the first spring limiting groove 104 or the second spring limiting groove 202, the backing plate 8 abuts against the end face of the pressure spring 4, and the thickness of the backing plate 8 can be replaced by various specifications.
In practical application, under the condition that the extension rod 2 extends to the longest, the pre-pressing force of the pressure spring 4 is 50-200N, and the elastic coefficient of the pressure spring 4 is 2-15N/mm.
In another aspect of the invention, an assembling method of a honing cutter special for valve body parts is provided, which comprises the following steps:
step one, a spring is arranged between a connecting rod 2 and a tail handle 1, and the upper end of the connecting rod 2 is inserted into a guide groove 101 of the tail handle 1;
step two, adjusting the rotation direction of the connecting rod 2 to enable the angle of the pin hole 201 to be consistent with that of the strip-shaped groove 102;
step three, applying a thrust to enable the connecting rod 2 to extend inwards and expose the pin 5 from the strip-shaped groove 102;
step four, inserting the pin hole 201 and withdrawing the thrust;
step five, sleeving a sheath 6 on the tail handle 1, wherein the upper end of the sheath 6 is abutted against the step surface of the tail handle 1;
step six, installing a retainer ring 7 for a shaft in a retainer ring groove of the tail handle 1, wherein the retainer ring 7 for the shaft blocks the lower end of the sheath 6;
and seventhly, inserting the mounting part 301 of the cutter body 3 into the lower opening of the connecting rod 2, and screwing the screw obliquely arranged on the connecting rod 2.
The working principle of the embodiment is as follows:
when the honing cutter disclosed by the invention is used for honing the orifice chamfer of the valve body part, the main shaft is fed, the honing guide part 303 of the cutter body 3 extends into the inner hole of the valve body to guide, the main shaft is continuously fed until the honing cutting edge part 302 of the cutter body 3 is just contacted with the orifice chamfer of the valve body, then the main shaft is continuously fed for a certain distance, so that the pressure spring 4 is compressed, the axial reaction force of the pressure spring 4 is utilized to prop against the connecting rod 2, honing is carried out under a certain pressure in the feeding direction, the honing effect can be ensured, the phenomenon of over honing cannot occur, the connecting rod 2 is in clearance fit with the tail stock 1, the pressure spring 4 is axially adopted, the position of the inner hole of the valve body has great containment, the influence of processing errors of other processes cannot occur, and the high precision of orifice chamfer honing is ensured.
The tail handle and the connecting rod are in limited sliding connection by adopting the pin and the strip-shaped groove, the strip-shaped groove is shielded by adopting the sheath, the pin cannot be separated, the sheath is fixed by adopting the retaining ring for the shaft, the connecting rod and the cutter body are in side fixing connection, and the whole installation process is in annular buckling, but the disassembly and assembly process is simple, and the rapid assembly can be realized.
In conclusion, the honing cutter special for valve body parts can ensure high-precision honing of the chamfer angle of the valve body orifice, can realize quick assembly, and has the advantages of high processing precision and convenience in operation.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above-mentioned embodiments are only for illustrating the technical idea and features of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it, and not to limit the protection scope of the present invention by this, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.
Claims (10)
1. A special honing cutter for valve body parts is characterized in that: the cutter is characterized by comprising a tail handle (1), a connecting rod (2) and a cutter body (3), wherein the upper end of the connecting rod (2) is coaxially sleeved in a guide groove (101) of the tail handle (1), a pressure spring (4) is arranged in the guide groove (101), two ends of the pressure spring (4) are respectively abutted against the tail handle (1) and the connecting rod (2), the upper end of the connecting rod (2) and the guide groove (101) are in clearance fit, a strip-shaped groove (102) is further formed in the side surface of the tail handle (1), the strip-shaped groove (102) is communicated with the guide groove (101), a pin hole (201) is formed in the connecting rod (2), a pin (5) is mounted on the pin hole (201), the head of the pin (5) is milled flat to form a parallel shape, the head of the pin (5) can slide in the strip-shaped groove (102) along the radial direction, the head of the pin (5) is in clearance fit with the strip-shaped groove (102), a detachable sheath (6) is further arranged on the tail handle (1), the sheath (6) covers the connecting rod, and the lower end of the cutter body (2) is fixedly connected with the cutter body (3).
2. The honing tool special for valve body parts as claimed in claim 1, wherein: cutter body (3) are including installation department (301), honing blade portion (302), honing guide (303), connect the lower extreme of pole (2) and installation department (301) of cutter body (3) to adopt the side to connect admittedly, installation department (301) are provided with mills flat inclined plane, the lower extreme that connects pole (2) is provided with the screw and locks to the inclined plane, honing guide (303) and the interior hole clearance fit of the body of rod, be provided with changeover portion (304) between honing guide (303) and honing blade portion (302), changeover portion (304) diameter is less than honing guide (303), honing blade portion (302) are the conical surface, and its blade leans out from changeover portion (304) to extend.
3. The honing tool special for valve body parts as claimed in claim 1, wherein: the gap between the upper end of the connecting rod (2) and the guide groove (101) is 0.4-0.5mm.
4. The honing tool special for valve body parts as claimed in claim 1, wherein: the tail handle (1) is further provided with an ejecting hole (103), the ejecting hole (103) is located on the back face of the strip-shaped groove (102), and when the connecting rod (2) extends out to the maximum extent, the ejecting hole (103) is communicated with the pin hole (201).
5. A honing tool dedicated to valve body parts as claimed in claim 1, wherein: the upper end of the sheath (6) is abutted against the step surface of the tail handle (1), the lower end of the sheath (6) is fixed by a shaft check ring (7), and the shaft check ring (7) is semi-sunk into a check ring groove arranged on the tail handle (1).
6. The honing tool special for valve body parts as claimed in claim 1, wherein: the inner diameter of the sheath (6) is larger than the outer diameter of the lower half part of the connecting rod (2).
7. The honing tool special for valve body parts as claimed in claim 1, wherein: the upper opening of the extension rod (2) is provided with a first spring limiting groove (104), a second spring limiting groove (202) is arranged in the guide groove (101) of the tail handle (1), and two ends of the pressure spring (4) are respectively arranged in the first spring limiting groove (104) and the second spring limiting groove (202).
8. A honing tool dedicated to valve body parts as claimed in claim 7, wherein: a base plate (8) is arranged in the first spring limiting groove (104) or the second spring limiting groove (202), the base plate (8) is abutted to the end face of the pressure spring (4), and the thickness of the base plate (8) can be replaced by various specifications.
9. A honing tool dedicated to valve body parts as claimed in claim 1, wherein: under the condition that the extension rod (2) extends to the longest, the pre-pressing force of the pressure spring (4) is 50-200N, and the elastic coefficient of the pressure spring (4) is 2-15N/mm.
10. A method for assembling a honing cutter special for valve body parts is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps that firstly, a spring is arranged between a connecting rod (2) and a tail handle (1), and the upper end of the connecting rod (2) is inserted into a guide groove (101) of the tail handle (1);
step two, adjusting the rotation direction of the connecting rod (2) to enable the angle of the pin hole (201) to be consistent with that of the strip-shaped groove (102);
step three, applying thrust to enable the connecting rod (2) to extend inwards and expose the pin (5) from the strip-shaped groove (102);
inserting the pin into the pin hole (201), and withdrawing the thrust;
step five, sleeving a sheath (6) on the tail handle (1), wherein the upper end of the sheath (6) is abutted against the step surface of the tail handle (1);
sixthly, mounting a shaft check ring (7) in a check ring groove of the tail handle (1), wherein the lower end of the sheath (6) is blocked by the shaft check ring (7);
seventhly, inserting the mounting part (301) of the cutter body (3) into the lower opening of the connecting rod (2), and screwing the screw obliquely arranged on the connecting rod (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210984335.6A CN115256211A (en) | 2022-08-17 | 2022-08-17 | Honing cutter special for valve body parts and assembling method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210984335.6A CN115256211A (en) | 2022-08-17 | 2022-08-17 | Honing cutter special for valve body parts and assembling method thereof |
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| CN115256211A true CN115256211A (en) | 2022-11-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210984335.6A Pending CN115256211A (en) | 2022-08-17 | 2022-08-17 | Honing cutter special for valve body parts and assembling method thereof |
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| CN (1) | CN115256211A (en) |
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| CN212734365U (en) * | 2020-08-13 | 2021-03-19 | 上海顾峰工业刀具有限公司 | Milling cutter with adjustable length |
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Application publication date: 20221101 |