CN113510537A - Grinding method and grinding device for high-precision sapphire valve seat ball groove - Google Patents

Grinding method and grinding device for high-precision sapphire valve seat ball groove Download PDF

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Publication number
CN113510537A
CN113510537A CN202110359723.0A CN202110359723A CN113510537A CN 113510537 A CN113510537 A CN 113510537A CN 202110359723 A CN202110359723 A CN 202110359723A CN 113510537 A CN113510537 A CN 113510537A
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CN
China
Prior art keywords
grinding
ball
valve seat
sapphire
groove
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CN202110359723.0A
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Chinese (zh)
Inventor
傅军
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Chongqing Zhaohong Technology Co ltd
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Chongqing Zhaohong Technology Co ltd
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Priority to CN202110359723.0A priority Critical patent/CN113510537A/en
Publication of CN113510537A publication Critical patent/CN113510537A/en
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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
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • 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
    • B24B15/00—Machines or devices designed for grinding seat surfaces; Accessories therefor
    • B24B15/08—Machines or devices designed for grinding seat surfaces; Accessories therefor for grinding co-operating seat surfaces by moving one over the other
    • 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
    • B24B35/00—Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency
    • 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
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/02—Lapping machines or devices; Accessories designed for working surfaces of revolution
    • 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
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/11—Lapping tools
    • 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
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/27—Work carriers
    • 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
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/34—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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/007—Weight compensation; Temperature compensation; Vibration damping
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/02—Frames; Beds; Carriages
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

The invention relates to the technical field of sapphire valve seat processing, in particular to a grinding method of a high-precision sapphire valve seat ball groove, which comprises the following steps of firstly, finely processing a sapphire blank into a sapphire valve seat ball groove; placing a sapphire valve seat fine molding blank in a central positioning hole on a novel grinding device, adding fine grinding paste to start the grinding device to grind, placing the sapphire valve seat after fine grinding in the central positioning hole, bonding a ground ruby ball at the lower end of a swing rod and then placing the ball in a ball groove of the sapphire valve seat, and adding fine grinding paste to grind; placing the matched ruby ball in a ball-shaped groove of the precisely ground sapphire valve seat, adding grinding fluid, and then grinding the damping pad to be in matched contact with the ruby ball to start grinding; the automatic grinding and matching device realizes the automatic grinding and matching and batch production of the high-precision jewel valve seats, so that the surface finish effect and the quality of the valve seats are more stable, the grinding and matching efficiency of the valve seats is improved, the qualification rate of products is greatly improved, and the production cost is reduced.

Description

Grinding method and grinding device for high-precision sapphire valve seat ball groove
Technical Field
The invention relates to the technical field of sapphire valve seat grinding, in particular to a grinding method and a grinding device for a high-precision sapphire valve seat ball groove.
Background
The red sapphire material is in the valve seat sleeve because of good physical and chemical properties. Sapphire is generally used as a valve base, and ruby is used as a sealing ball, on one hand, the excellent physicochemical properties of high hardness (Mohs 9 grade), high compressive strength, high temperature resistance, acid and alkali corrosion resistance and the like of a sapphire material are utilized. The gem valve seat product is widely applied to the fields of civil medical treatment, high-precision measuring instruments, aerospace and the like, and is also commonly used for a flow control valve or a one-way control valve, such as a one-way valve of a liquid chromatograph, a one-way valve of a constant flow pump, a flow meter ball valve, a four-door directional flow valve, a flow control valve of a breathing machine and the like. The sealing pressure value of a sapphire valve seat which takes sapphire as a valve base and takes a ruby ball as a sealing ball body is usually required to be 20-30 MPa or below. For the flow valve, the sealing requirement of the matching surface of the sapphire valve seat and the ruby ball is not high, but for the one-way valve, the sealing requirement of the matching surface is very high, and the sealing pressure value of the matching surface is usually required to be more than 30MPa, even 50 MPa; therefore, the requirement for the precision of the ruby ball and the grinding of the sapphire valve seat is high.
The existing production process method of the gem valve seat comprises the following steps:
and after the groove shape of the sapphire base is preliminarily formed, the groove shape of the sapphire valve seat is precisely formed, the third step is to manually grind and match the sapphire valve seat and the ruby ball, and finally, finished product inspection and packaging are carried out for delivery.
The existing method has the following defects:
1) the sapphire valve seat is mainly ground and matched in a complete set in a manual mode, and the interchangeability of accessories is extremely poor;
2) the sapphire valve seat is ground and matched on a machine tool by adopting a single manual piece, because only the valve seat rotates, a grinding ball does not rotate by manual swing, the efficiency of manual grinding and matching is very low, and the quality of the sapphire valve seat is influenced by various factors such as equipment precision, a motion mode, worker operation skill and the like, so that the finish quality and the finish quality of the surface of the sapphire valve seat are extremely unstable, the qualification rate of a product is low, and the production cost is extremely high;
3) the precision requirement on the forming equipment is high, and the requirement on the operating skill of an operator is high;
4) to reduce or eliminate the incidence of chipping and other processing defects in the grinding of sapphire valve seats. A great deal of manpower, material resources and blanks are necessarily invested. The processing purpose can not be achieved by the existing processing technology. And the difficulty of groove shape processing of the product is greatly increased, the working efficiency is low, and the production cost is high.
5) At present, high-precision sapphire valve seat products can only be produced in a sample test mode and cannot be provided in large batch.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a grinding method and a grinding device for a high-precision sapphire valve seat ball groove, aiming at solving the technical problems that the existing high-precision sapphire valve seat ball groove can only be manually ground and matched, the interchangeability of accessories is extremely poor, the surface finish effect and quality of a valve seat are extremely unstable, the qualified rate of products is low, the production cost is high, the requirements on the precision of equipment and the processing skill of operators are high, the processing procedure and the difficulty of sapphire valve seat products are large, batch production cannot be realized, and the like.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a grinding method of a high-precision sapphire valve seat ball groove comprises the following steps,
s1, fine molding: directly and finely machining the qualified sapphire blank into a spherical groove of the sapphire valve seat on groove type machining equipment by adopting a generating method principle; the curvature radius SR size of the processed spherical groove is 0.025-0.02 mm larger than the grinding ball size;
s2, fine grinding: selecting a novel grinding device, placing a sapphire valve seat fine molding blank in a central positioning hole of a grinding sand seat of a grinding device main shaft connecting seat, adding fine grinding paste, and placing a swing rod fixed with a grinding ball in a ball-shaped groove of the sapphire valve seat; adjusting the rotation speed of a main shaft of the grinding device to be 300-1200 rpm; the length of the swing rod is 15-50 mm, the cone angle of the swing rod is 30-90 degrees, and the swing angle of the swing rod is 3-45 degrees; the diameter of the grinding ball is 0.001-0.005 mm larger than that of the ruby ball, the fine grinding time is 1-6 min, and finally the grinding device is started to make a swing rod move circularly to grind the spherical groove and then stop;
s3, fine grinding: placing the sapphire valve seat after fine grinding in a central positioning hole, placing a ground ruby ball in a ball-shaped groove of the sapphire valve seat after the ground ruby ball is bonded at the lower end of a swing rod, and adding fine grinding paste; adjusting the rotation speed of the main shaft to 200-600 rpm, fine grinding time to 6-12 min, finally starting the grinding device for grinding, and stopping after grinding is finished;
s4, ultra-precision grinding: placing the matched ruby ball in a spherical groove of the precisely ground sapphire valve seat, adding grinding fluid, and enabling a grinding damping pad fixed on the lower end of the upper pressure rod to be in matched contact with the ruby ball; adjusting the rotation speed of the main shaft to be 5-200 rpm, and stopping grinding until the groove surface roughness of the spherical groove reaches Ra0.008-Ra0.012; and finally, cleaning the sapphire valve seat and the ruby ball, and then, matching and packaging the sapphire valve seat and the ruby ball for delivery.
Preferably, the fine abrasive paste in step S2 is a mixture of synthetic diamond fine powder with a particle size of JRW 3.5.5 or less and organic substances; the concentration of the fine polishing paste is 1/3-1/2 of the concentration of the fine polishing paste.
Preferably, the grinding round balls in the step S2 are grade 5-10 grinding steel balls; the use frequency of the grinding steel ball is 3-12 times.
Preferably, the fine polishing paste in step S3 is a mixture of artificial diamond fine particles having a particle size of JRW 1.5.5 or less and organic substances, and the concentration of the fine polishing paste is 1/3 to 1/2 of the concentration of the fine polishing paste.
Preferably, the polished ruby ball in step S3 is replaced for 1-2 times, and the groove surface roughness of the ball groove of the precisely polished sapphire valve seat is ra0.025-ra0.012.
Preferably, the grinding liquid in step S4 is a chemical polishing liquid.
A grinding device for a high-precision sapphire valve seat ball groove comprises a machine tool connecting seat, wherein a main shaft is arranged in the machine tool connecting seat, a grinding seat is fixedly arranged at the top of the main shaft, and a central positioning hole for mounting a sapphire valve seat is formed in the top of the grinding seat; the grinding device is characterized by further comprising a support, wherein a fixed pressure rod is vertically arranged on the support, a first grinding mechanism for fine grinding and fine grinding or a second grinding mechanism for ultra-fine grinding is arranged at the lower end of the fixed pressure rod, and a grinding round ball or a grinding ruby round ball is bonded at the lower end of the first grinding mechanism; a grinding damping pad is bonded at the lower end of the second grinding mechanism; the grinding ball or the grinding ruby ball is matched with the spherical groove of the sapphire valve seat.
Preferably, the first grinding mechanism comprises a buffer rod and a swing rod, the bottom of the fixed compression rod is provided with a mounting hole, the top of the buffer rod is fixed in the mounting hole, the bottom surface of the buffer rod is provided with a swing hole in a conical structure, the top of the swing rod is provided with a matching part in a conical structure, and the swing hole of the matching part of the swing rod is abutted to match the swing hole; and a grinding ball or a grinding ruby ball matched with the spherical groove of the sapphire valve seat is bonded at the bottom of the oscillating bar.
Preferably, the second grinding mechanism comprises an upper pressing rod, a mounting hole is formed in the bottom of the fixed pressing rod, the upper end of the upper pressing rod is fixed in the mounting hole, a grinding damping pad is fixed at the lower end of the upper pressing rod, and the grinding damping pad is matched with a grinding ruby ball placed in a spherical groove of the sapphire valve seat.
Preferably, a buffer spring is arranged on the outer side wall of the top of the buffer rod or the upper pressure rod, and the buffer spring is located in the mounting hole.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention adjusts the technological parameters of the grinding device by skillfully improving partial structure on the prior grinding machine, and completely realizes the automatic grinding and matching of the spherical groove of the sapphire valve seat. The original manual single piece processing and bedding-in is changed into automatic processing and bedding-in of a plurality of pieces, not only can the batch production of the high-precision jewel valve seats be realized, but also the bedding-in efficiency of the high-precision jewel valve seats can be greatly improved, the production period is shortened, and the production cost is obviously reduced; on the other hand, the interchangeability of the jewel valve seat fittings is obviously enhanced, and the adaptability of the high-precision jewel valve seat is stronger.
2) According to the automatic grinding and matching device, the automatic grinding and matching of the high-precision jewel valve seat are realized, the grinding times of the grinding ball and the grinding ruby ball are ensured as long as the operating parameters of the grinding device are consistent, the grinding and matching quality of the finally processed high-precision jewel valve seat can be effectively ensured, the grinding and matching quality of the sapphire valve seat is prevented from being influenced by various uncertain factors, the qualification rate of the jewel valve seat product subjected to automatic grinding and matching is high, and the production cost is greatly reduced.
3) According to the grinding method and the grinding device for the high-precision sapphire valve seat, provided by the invention, a worker only needs to install and place equipment, the sapphire valve seat and the grinding ball, the grinding ball is replaced periodically, the requirements on the operation skills of processing equipment and the worker are lower, the processing technology is simple, and the grinding speed is improved.
4) The product with low sealing requirement can meet the requirement only by a fine grinding process, and the sapphire valve seat product cannot generate a broken mouth and other processing defects in the grinding process, so that the qualification rate of the product is obviously improved.
5) The invention can realize normal valve seat groove grinding only by additionally installing a grinding part as required without improving the prior grinding equipment. The grinding equipment has simple structure and easy operation, and can realize fine grinding, fine grinding and ultra-fine grinding on the same equipment; the labor intensity of operators is reduced, the grinding efficiency is improved, and the cost of processing equipment is extremely low; meanwhile, according to different product specifications, corresponding bedding-in accessories can be replaced, bedding-in of jewel valve seats of various specifications can be realized, and the tool can be conveniently replaced at any time after being worn, so that the equipment has good adaptability and long service life.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only part of the embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts according to the accompanying drawings:
fig. 1 is a schematic structural diagram of an embodiment of a method and an apparatus for polishing a ball groove of a high-precision sapphire valve seat in the present invention.
FIG. 2 is another schematic structural diagram of an embodiment of a method and apparatus for polishing a ball groove of a high-precision sapphire valve seat.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, belong to the scope of protection of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The grinding method for the ball groove of the high-precision sapphire valve seat 5 in the preferred embodiment of the invention comprises the following steps:
s1, fine molding: directly and finely machining the qualified sapphire blank into a spherical groove of the sapphire valve seat 5 on groove type machining equipment by adopting a generating method principle; the curvature radius SR size of the processed spherical groove is 0.025-0.02 mm larger than the grinding ball 8 size;
s2, fine grinding: selecting a novel grinding device, placing a precision forming blank of a sapphire valve seat 5 in a central positioning hole 4 of a grinding sand seat connected with a main shaft 2 of the grinding device, adding fine grinding paste, and placing a swing rod 11 fixed with a grinding ball 8 in a spherical groove of the sapphire valve seat 5; adjusting the rotation speed of the main shaft 2 of the grinding device to be 300-1200 rpm; the length of the oscillating bar 11 is 15-50 mm, the cone angle of the oscillating bar 11 is 30-90 degrees, and the oscillating angle of the oscillating bar 11 is 3-45 degrees; the diameter of the grinding ball 8 is 0.001-0.005 mm larger than that of the ruby ball, the fine grinding time is 1-6 min, and finally the grinding device is started to enable the swing rod 11 to make circular motion to grind the spherical groove and then the grinding device is stopped;
s3, fine grinding: placing the sapphire valve seat 5 after fine grinding in the central positioning hole 4, placing a ground ruby ball in a ball groove of the sapphire valve seat 5 after the ground ruby ball is bonded at the lower end of the swing rod 11, and adding fine grinding paste; adjusting the rotation speed of the main shaft 2 to be 200-600 rpm, fine grinding time to be 6-12 min, finally starting a grinding device for grinding, and stopping after grinding is finished;
s4, ultra-precision grinding: placing the matched ruby ball in a spherical groove of the precisely ground sapphire valve seat 5, adding grinding liquid, and enabling a grinding damping pad 9 fixed on the lower end of an upper pressure rod 16 to be in matched contact with the ruby ball; adjusting the rotation speed of the main shaft 2 to be 5-200 rpm, and stopping grinding until the groove surface roughness of the spherical groove reaches Ra0.008-Ra0.012; and finally, cleaning the sapphire valve seat 5 and the ruby ball, and then packaging the sapphire valve seat and the ruby ball in a matching way to leave a factory.
In specific implementation, the fine grinding paste in the step S2 is a mixture of artificial diamond micro powder with a particle size of JRW 3.5.5 or less and organic matters, and the mixing ratio of the diamond micro powder to the organic matters is 1: 25-1: 100; the organic matter is a mixture of oleic acid, petrolatum and fat.
In specific implementation, the grinding round ball 8 in the step S2 is a 5-10 grade grinding steel ball; the use frequency of the grinding steel ball is 3-12 times.
Specifically, the fine grinding paste in step S3 is a mixture of artificial diamond micro-particles with a particle size of JRW 1.5.5 or less than 1.5 and organic matter, and the concentration of the fine grinding paste is 1/3-1/2 of the concentration of the fine grinding paste.
In specific implementation, the ruby sphere in the step S3 is replaced by 1-2 times, and the groove surface roughness of the spherical groove of the precisely-ground sapphire valve seat 5 is ra0.012-ra0.025.
In a specific implementation, the polishing solution in step S4 is a chemical polishing solution. The ultra-precision grinding time is shortened, the groove surface roughness of the spherical groove can reach Ra0.008-Ra0.012, and the requirement of a high-precision jewel valve seat is met.
A grinding device for a high-precision sapphire valve seat 5 ball groove comprises a machine tool connecting seat 1, wherein a main shaft 2 is arranged in the machine tool connecting seat 1 and is connected with a power mechanism; the top of the main shaft 2 is fixedly provided with a grinding seat 3, and the top of the grinding seat 3 is provided with a central positioning hole 4 for mounting a sapphire valve seat 5; the grinding device is characterized by further comprising a support 6, wherein a fixed pressure rod 7 is vertically arranged on the support 6, a first grinding mechanism for fine grinding and fine grinding or a second grinding mechanism for ultra-fine grinding is arranged at the lower end of the fixed pressure rod 7, and a grinding round ball 8 or a grinding ruby round ball is bonded at the lower end of the first grinding mechanism; the lower end of the second grinding mechanism is bonded with a grinding damping pad 9; the grinding ball 8 or the grinding ruby ball is matched with the spherical groove of the sapphire valve seat 5.
In specific implementation, referring to fig. 1, the first grinding mechanism includes a buffer rod 10 and a swing rod 11, a mounting hole 12 is formed in the bottom of the fixed compression rod 7, the top of the buffer rod 10 is fixed in the mounting hole 12 through a locking bolt 14, a swing hole 13 in a conical structure is formed in the bottom surface of the buffer rod 10, a matching portion 15 in a conical structure is formed in the top of the swing rod 11, and the swing hole 13 of the matching portion 15 of the swing rod 11 is abutted to match the swing hole; and a grinding ball 8 or a grinding ruby ball matched with the spherical groove of the sapphire valve seat 5 is bonded at the bottom of the swing rod 11. Set up like this and make pendulum rod 11 make circular motion can carry out the fine lapping to the precious stone disk seat and join in marriage with the lapping, simple structure, it is quick to change, and the precious stone disk seat after the lapping can satisfy the requirement of low accuracy precious stone disk seat, consequently, the precious stone disk seat after the fine lapping is joined in marriage and the lapping can directly be used for in the lower equipment of precision.
In specific implementation, referring to fig. 2, the second grinding mechanism includes an upper pressing rod 16, a mounting hole 12 is formed in the bottom of the fixed pressing rod 7, the upper end of the upper pressing rod 16 is fixed in the mounting hole 12 through a locking bolt 14, a grinding damping pad 9 is fixed at the lower end of the upper pressing rod 16, and the grinding damping pad 9 is matched with a grinding ruby ball placed in a spherical groove of the sapphire valve seat 5. Set up simple structure like this, change the accessory at same device and just can carry out superfine grinding to the precious stone disk seat for cooperation precision between sapphire disk seat 5 and the ruby ball is higher, can realize completely that the pressure of precious stone disk seat reaches 30 ~ 50 MPa's requirement, makes the precious stone disk seat can be used for in the high accuracy device completely.
In specific implementation, a buffer spring 17 is arranged on the outer side wall of the top of the buffer rod 10 or the upper pressure rod 16, and the buffer spring 17 is located in the mounting hole 12. Make the motion of pendulum rod 11 and last depression bar 16 more smooth like this, can realize grinding device again and realize flexible compensation in the motion process, reduce the work piece that is being researched and joined in marriage and produce broken situation, still make the grinding quality on the spherical groove surface of 5 of sapphire disk seats of being researched and joined in marriage better in addition for the cooperation precision after sapphire disk seat 5 and the ruby ball are researched and joined in marriage is higher.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.

Claims (10)

1. A grinding method of a high-precision sapphire valve seat ball groove is characterized by comprising the following steps,
s1, fine molding: directly and finely machining the qualified sapphire blank into a spherical groove of the sapphire valve seat on groove type machining equipment by adopting a generating method principle; the curvature radius SR size of the processed spherical groove is 0.025-0.02 mm larger than the grinding ball size;
s2, fine grinding: selecting a novel grinding device, placing a sapphire valve seat fine molding blank in a central positioning hole of a grinding sand seat of a grinding device main shaft connecting seat, adding fine grinding paste, and placing a swing rod fixed with a grinding ball in a ball-shaped groove of the sapphire valve seat; adjusting the rotation speed of a main shaft of the grinding device to be 300-1200 rpm; the length of the swing rod is 15-50 mm, the cone angle of the swing rod is 30-90 degrees, and the swing angle of the swing rod is 3-45 degrees; the diameter of the grinding ball is 0.001-0.005 mm larger than that of the ruby ball, the fine grinding time is 1-6 min, and finally the grinding device is started to make a swing rod move circularly to grind the spherical groove and then stop;
s3, fine grinding: placing the sapphire valve seat after fine grinding in a central positioning hole, placing a ground ruby ball in a ball-shaped groove of the sapphire valve seat after the ground ruby ball is bonded at the lower end of a swing rod, and adding fine grinding paste; adjusting the rotation speed of the main shaft to 200-600 rpm, fine grinding time to 6-12 min, finally starting the grinding device for grinding, and stopping after grinding is finished;
s4, ultra-precision grinding: placing the matched ruby ball in a spherical groove of the precisely ground sapphire valve seat, adding grinding fluid, and enabling a grinding damping pad fixed on the lower end of the upper pressure rod to be in matched contact with the ruby ball; adjusting the rotation speed of the main shaft to be 5-200 rpm, and stopping grinding until the groove surface roughness of the spherical groove reaches Ra0.008-Ra0.012; and finally, cleaning the sapphire valve seat and the ruby ball, and then, matching and packaging the sapphire valve seat and the ruby ball for delivery.
2. The method for grinding a ball groove of a high-precision sapphire valve seat according to claim 1, wherein the fine grinding paste in step S2 is a mixture of synthetic diamond micropowder with a particle size of JRW 3.5.5 or less and organic matter, and the mixing ratio of the diamond micropowder to the organic matter is 1:25 to 1: 100.
3. The method for grinding the ball groove of the high-precision sapphire valve seat according to claim 1, wherein the grinding ball in the step S2 is a grade 5-10 grinding steel ball; the use frequency of the grinding steel ball is 3-12 times.
4. The method for grinding a ball groove of a high-precision sapphire valve seat according to claim 1, wherein the fine grinding paste in step S3 is a mixture of synthetic diamond micropowder having a particle size of JRW 1.5.5 or less and organic substances, and the concentration of the fine grinding paste is 1/3 to 1/2% of the concentration of the fine grinding paste.
5. The method for grinding the ball groove of the high-precision sapphire valve seat according to claim 1, wherein the ground ruby ball is replaced by 1-2 times in step S3, and the surface roughness of the groove of the ball groove of the sapphire valve seat after being finely ground is Ra0.025-Ra0.012.
6. The method for grinding the ball groove of the high-precision sapphire valve seat according to claim 1, wherein the grinding liquid in step S4 is a chemical polishing liquid.
7. The grinding device for the ball groove of the high-precision sapphire valve seat is characterized by comprising a machine tool connecting seat, wherein a main shaft is arranged in the machine tool connecting seat, a grinding seat is fixedly arranged at the top of the main shaft, and a central positioning hole for mounting the sapphire valve seat is formed in the top of the grinding seat; the grinding device is characterized by further comprising a support, wherein a fixed pressure rod is vertically arranged on the support, a first grinding mechanism for fine grinding and fine grinding or a second grinding mechanism for ultra-fine grinding is arranged at the lower end of the fixed pressure rod, and a grinding round ball or a grinding ruby round ball is bonded at the lower end of the first grinding mechanism; a grinding damping pad is bonded at the lower end of the second grinding mechanism; the grinding ball or the grinding ruby ball is matched with the spherical groove of the sapphire valve seat.
8. The grinding device for the ball groove of the high-precision sapphire valve seat according to claim 7, wherein the first grinding mechanism comprises a buffer rod and a swing rod, the bottom of the fixed compression rod is provided with a mounting hole, the top of the buffer rod is fixed in the mounting hole, the bottom surface of the buffer rod is provided with a swing hole in a conical structure, the top of the swing rod is provided with a matching part in a conical structure, and the swing hole of the matching part of the swing rod is abutted and matched; and a grinding ball or a grinding ruby ball matched with the spherical groove of the sapphire valve seat is bonded at the bottom of the oscillating bar.
9. The device for grinding the ball groove of the high-precision sapphire valve seat according to claim 7, wherein the second grinding mechanism comprises an upper pressing rod, a mounting hole is formed in the bottom of the fixing pressing rod, the upper end of the upper pressing rod is fixed in the mounting hole, a grinding damping pad is fixed at the lower end of the upper pressing rod, and the grinding damping pad is matched with a grinding ruby ball placed in the ball groove of the sapphire valve seat.
10. A grinding device for a high-precision sapphire valve seat ball groove according to any one of claims 7 or 8, wherein a buffer spring is arranged on the outer side wall of the top of the buffer rod or the upper pressure rod, and the buffer spring is located in the mounting hole.
CN202110359723.0A 2021-04-02 2021-04-02 Grinding method and grinding device for high-precision sapphire valve seat ball groove Pending CN113510537A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114310561A (en) * 2021-12-30 2022-04-12 西安现代控制技术研究所 Aircraft actuating mechanism drive assembly grinds mechanism
CN114505651A (en) * 2021-12-29 2022-05-17 中国航发长春控制科技有限公司 Grinding ring belt device and sealing conical surface machining method
CN114918818A (en) * 2022-05-31 2022-08-19 重庆川仪自动化股份有限公司 Grinding and polishing method for sealing groove of jewel valve seat of one-way valve

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114505651A (en) * 2021-12-29 2022-05-17 中国航发长春控制科技有限公司 Grinding ring belt device and sealing conical surface machining method
CN114310561A (en) * 2021-12-30 2022-04-12 西安现代控制技术研究所 Aircraft actuating mechanism drive assembly grinds mechanism
CN114310561B (en) * 2021-12-30 2024-04-05 西安现代控制技术研究所 Aircraft actuating mechanism drive assembly grinding mechanism
CN114918818A (en) * 2022-05-31 2022-08-19 重庆川仪自动化股份有限公司 Grinding and polishing method for sealing groove of jewel valve seat of one-way valve

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