CN110640635A - Coating-writing type metal workpiece surface reinforced grinding processing method and equipment - Google Patents
Coating-writing type metal workpiece surface reinforced grinding processing method and equipment Download PDFInfo
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- CN110640635A CN110640635A CN201910908586.4A CN201910908586A CN110640635A CN 110640635 A CN110640635 A CN 110640635A CN 201910908586 A CN201910908586 A CN 201910908586A CN 110640635 A CN110640635 A CN 110640635A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/18—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions
- B24C3/20—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions the work being supported by turntables
- B24C3/22—Apparatus using nozzles
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- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention discloses a coating-writing type metal workpiece surface strengthening grinding processing method and equipment, wherein the processing method comprises the following steps: (1) clamping a workpiece to be processed on an electromagnetic centerless fixture, and aligning a high-speed spray head and a coating head on the processing surface of the workpiece; (2) starting a rotary driving mechanism to enable the electromagnetic centerless fixture to drive a workpiece to be machined to rotate; (3) starting the mixed coating device, mixing the grinding powder and the grinding fluid, coating the mixed grinding material on the surface of the workpiece through a coating head, and adhering the grinding powder on the surface of the workpiece through the grinding fluid; (4) and starting the high-pressure injection device to inject the steel balls to the surface of the workpiece at a high speed, wherein the high-speed steel balls directly impact the grinding powder, and the grinding powder strongly impacts the surface of the workpiece to form a strengthened grinding layer on the surface of the workpiece. The invention not only can ensure that the intensified grinding processing effect is more uniform, but also can prevent the grinding material from diffusing in the working environment to cause pollution, and simultaneously avoids the surface oxidation of the workpiece.
Description
Technical Field
The invention relates to a method and equipment for strengthening and processing the surface of a metal workpiece, in particular to a method and equipment for strengthening and grinding the surface of a scribbling type metal workpiece.
Background
With the development of modern industrial technologies, people have higher and higher requirements on the safe and reliable performance and the service life of mechanical equipment, such as airplanes, armored vehicles, ships, locomotives, automobiles, internal combustion engines, steam turbines, metallurgical machines, petroleum machines, coal mining machines, mining machines and the like; wherein, all bearing parts bearing the cyclic load can have the phenomenon such as part fracture because of fatigue at any time, and its aftereffect not only can cause property loss, still can lead to the casualties, therefore improve the fatigue strength and the life-span of machine parts and have great meaning.
Among them, some processing methods using high-speed jet polishing materials to impact a workpiece are proposed in the prior art, for example, the invention application with application publication number CN101733707A proposes a novel processing method of reinforced polishing, in which a reinforced abrasive material is used to impact a target surface to be processed at a high speed at a certain angle, and a reinforced layer with a certain depth is formed in an impact region during cutting, so that the surface roughness of the workpiece is reduced, the generation of surface microcracks can be effectively inhibited, the fatigue life of parts is prolonged, and the surface quality of the workpiece is generally improved.
However, with the increasing quality and demand, the above-mentioned strengthening processing technology has the following disadvantages:
1. the uneven distribution of the steel balls, the grinding powder and the grinding liquid leads to the fact that the injection of the grinding material can not be continuously carried out in the machining process, and the machining precision is affected.
2. The grinding powder is randomly distributed on the steel balls, so that the grinding powder can not be uniformly adhered to the front of each impact point during spraying, the cutting performance is influenced to a great extent, and meanwhile, the impact strength of a machining area is reduced, so that the residual compressive stress is reduced, and the fatigue resistance is reduced.
3. The grinding powder is directly sprayed and released to the atmosphere, the density of suspended particles in a processing area is increased, the environment is polluted, the health of operators is seriously influenced, meanwhile, the grinding powder cannot be recycled, and the utilization rate of the grinding powder is reduced.
4. In the processing process, the processing surface of the workpiece is directly exposed in the air, so that the oxidation phenomenon of the processing surface is easily caused, and the quality needs to be improved.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned problems, and an object of the present invention is to provide a method for strengthening and grinding the surface of a metal workpiece, which can ensure a more uniform strengthening and grinding effect, and can effectively prevent the grinding material from diffusing in the working environment to cause contamination, and at the same time, prevent the surface of the workpiece from being oxidized.
The invention also aims to provide a coating type metal workpiece surface strengthening grinding processing device.
The purpose of the invention is realized by the following technical scheme:
a coating-writing type metal workpiece surface strengthening grinding processing method comprises the following steps:
(1) clamping a workpiece to be processed on an electromagnetic centerless fixture, wherein a high-speed spray head of a high-pressure spraying device and a coating head of a mixed coating device are aligned to the processing surface of the workpiece;
(2) starting a rotary driving mechanism to drive the electromagnetic centerless fixture to rotate, and then driving a workpiece to be machined to rotate;
(3) starting the mixed coating device, mixing the grinding powder and the grinding fluid, coating the mixed grinding material on the processing surface of the workpiece which rotates continuously through the coating head, and uniformly adhering the grinding powder on the processing surface of the workpiece through the self adhesive force of the grinding fluid;
(4) and starting the high-pressure injection device, injecting the steel balls to the processing surface of the workpiece adhered with the mixed abrasive at a high speed, circularly rotating the workpiece along with the rotary driving mechanism, directly impacting the abrasive powder adhered to the surface of the workpiece after the high-speed steel balls approach the processing surface of the workpiece, and strongly impacting the processing surface of the workpiece by the abrasive powder with smaller volume to form a strengthened grinding layer on the surface of the workpiece.
In a preferred embodiment of the present invention, in step (2), after the rotational driving mechanism is started, the axial driving mechanism is started, and the workpiece moves linearly along the axial direction while rotating, so that the workpiece can move transversely relative to the coating and writing head and the high-speed nozzle, and under the condition that the coating and writing head and the high-speed nozzle are not moved, the coating and writing head and the high-speed nozzle are transversely and cyclically received by the coating and writing head and the high-speed nozzle, so as to enhance the processing effect.
In a preferred embodiment of the present invention, in the step (3), the grinding powder and the grinding fluid are mixed in a volume ratio of 1: 1 to form a semi-fluid mixture.
A scribble write-on metal workpiece surface and strengthen the grinding processing apparatus, including the rotary clamping device used for clamping the work piece, the mixed scribble write-on device used for scribbling the mixed abrasive material of mixed on the processing surface of the work piece and high-pressure injection apparatus used for spraying the high-speed steel ball to the processing surface of the work piece evenly, the said mixed abrasive material is the mixed body of semi-fluid form that grinding fluid and abrasive powder mix;
the rotary clamping device comprises an electromagnetic centerless clamp and a rotary driving mechanism for driving the electromagnetic centerless clamp to rotate; the mixed coating and writing device comprises a coating and writing mechanism and a mixing mechanism for uniformly mixing the grinding fluid and the grinding powder, wherein the coating and writing mechanism comprises a coating and writing head for uniformly arranging the mixed grinding material on the processing surface of the workpiece in a coating and writing mode.
The working principle of the reinforced grinding processing equipment is as follows:
when the electromagnetic centerless fixture works, a workpiece is clamped on the electromagnetic centerless fixture and is rotationally driven by the rotary driving mechanism; the grinding fluid and the grinding powder are uniformly mixed through a mixing mechanism to obtain a semi-fluid mixture, the mixture is arranged on the processing surface of a workpiece in a coating (painting) mode through a coating head, and finally the surface of the workpiece adhered with the mixture is impacted through high-speed steel balls, so that a strengthened grinding layer is formed on the surface of the workpiece. Specifically, in the process of workpiece rotation, the metal steel ball carries huge kinetic energy to impact the surface to be processed with a certain angle at random and equal probability, because the grinding powder (composed of brown corundum with a size smaller than that of the steel ball) is uniformly adhered to the surface of the workpiece, the steel ball can impact the grinding powder, the grinding powder with a tiny contact surface can form huge instantaneous impact, when the impact strength is greater than the dynamic yield strength of the surface of the workpiece, the surface of the workpiece can generate plastic deformation, the plastic deformation has a certain depth in the impact propagation direction, after the impact is finished, only elastic deformation is generated around the workpiece, the extrusion of plastic deformation tissue recovery is not generated, and the impact area can form residual compressive stress; meanwhile, the grinding powder is separated from and takes away part of the target surface material, micro-cutting is generated on the target surface, the micro-cutting tends to be uniform after repeated processing for many times to achieve a macroscopic grinding effect, and finally the effect of strengthening the processing surface in the grinding process is achieved.
In a preferred embodiment of the present invention, the rotary clamping device further includes an axial driving mechanism for driving the electromagnetic centerless fixture to move axially.
In a preferred aspect of the present invention, the high-pressure injection device includes a hopper for loading steel balls to be injected, a high-speed injection head for injecting the steel balls at a high speed onto a surface of a workpiece, and a high-pressure suction mechanism for sucking the steel balls from the hopper to the high-speed injection head.
According to a preferable scheme of the invention, after the electromagnetic centerless clamp clamps and fixes the workpiece, the workpiece is vertically placed, and the axis of the workpiece extends along the horizontal direction; the high-speed spray head and the coating head are positioned above the workpiece and face the processing surface of the workpiece from top to bottom in an inclined mode. Through the structure, the steel balls are effectively guaranteed to be collected after being impacted, the coating and writing mode that the coating and writing head is arranged above and below the workpiece is realized, and the workpiece can receive the coating and writing of the coating and writing head conveniently.
Preferably, the high-speed spray head and the coating head are respectively arranged on two sides of a vertical surface passing through the axis of the workpiece; in the direction of rotation, the work surface of the workpiece to be coated is rotated from the front of the coating head from bottom to top about its center of rotation. Thus, the abrasive mixture can be stably attached to the surface of the workpiece without easily being detached after the coating head coats the abrasive mixture on the surface of the workpiece based on the gravity and the adhesive force (greater than the centrifugal force) of the abrasive mixture itself.
According to a preferable scheme of the invention, the rotary clamping device further comprises two limit stops for positioning the workpiece from bottom to top; wherein, two limit stop set up respectively in the both sides of the vertical face through the axis of work piece. Through setting up two limit stop, not only can inject the work piece in the position that the electromagnetism centerless anchor clamps set for, play the effect of location, can also carry on spacingly to the work piece at rotatory in-process, keep off the work piece on two dogs all the time.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the grinding powder and the grinding liquid are uniformly mixed and are arranged on the surface of the workpiece in a coating mode, so that the grinding powder can be stably and uniformly adhered to the workpiece through the self adhesive force of the grinding liquid, and each impact point is ensured to have the grinding powder when the high-speed steel ball impacts, so that the strengthening processing effect is more uniform.
2. Because the steel ball is for independent work, just strike the machined surface of work piece after mixing the abrasive material and arranging, avoided like this to mix with lapping liquid and abrasive powder, therefore can not produce the great mixture of cohesive force to can not lead to the fact the jam to high-pressure injection device's pipeline, ensure that the process of spraying is unobstructed completely.
3. After the grinding fluid with larger viscous force is mixed with the grinding powder, the grinding powder can be stably adhered to the surface of a workpiece, and the grinding powder can be locked, so that the grinding powder is prevented from being diffused in a working environment, air pollution is avoided, and the recovery rate of the grinding powder can be improved.
4. The mixed abrasive is coated on the surface of the workpiece, namely the surface of the workpiece is isolated from the air, so that the surface which is just finished is prevented from being oxidized, and the overall quality of the reinforced processing is effectively improved.
5. Compared with the traditional strengthening processing technology (the steel balls, the grinding powder and the grinding liquid are mixed together to impact the surface of a workpiece), the invention completely separates the steel balls with larger mass and volume from the grinding powder with smaller mass and volume, and uniformly arranges the grinding powder on the surface of the workpiece through the grinding liquid, so that the grinding powder is used as a passive impact body, and the steel balls sprayed at high speed by a high-pressure spraying device are used as an active impact body; at the rotatory in-process of work piece, the steel ball carries huge kinetic energy toward the impact of workpiece surface, when carrying huge kinetic energy steel ball and attached to the little grinding powder contact of volume on the workpiece surface, huge function is not transmitted to the workpiece surface by the steel ball, but carries out indirect transmission by the little grinding powder of volume, because the area of contact between grinding powder and the work piece is very little, be equivalent to the huge function that the little grinding powder of volume possess high-speed steel ball strikes workpiece surface, therefore the impact stress who brings like this will be huge, thereby bring better intensive processing effect.
Drawings
FIG. 1 is a schematic diagram of the surface enhanced grinding equipment for painting and writing type metal workpiece in the invention.
FIG. 2 is an enlarged view of the contact between the steel ball and the grinding powder in the present invention.
Detailed Description
In order to make those skilled in the art understand the technical solutions of the present invention well, the following description of the present invention is provided with reference to the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
Referring to fig. 1, the equipment for strengthening and grinding the surface of a painted metal workpiece in the embodiment includes a rotating and clamping device for clamping the workpiece 1, a mixed painting device for uniformly painting a mixed abrasive on the machining surface of the workpiece 1, and a high-pressure jetting device for jetting high-speed steel balls 5 to the machining surface of the workpiece 1, wherein the mixed abrasive is a semi-fluid mixture formed by mixing grinding fluid and grinding powder.
The rotary clamping device comprises an electromagnetic centerless clamp, a rotary driving mechanism for driving the electromagnetic centerless clamp to rotate, an axial driving mechanism for driving the electromagnetic centerless clamp to axially move and two limit stops 4, wherein the two limit stops 4 are used for positioning the workpiece 1 from bottom to top; wherein the two limit stoppers 4 are respectively provided on both sides of a vertical plane passing through the axis of the workpiece 1. Through setting up two limit stop 4, not only can inject work piece 1 in the position that the electromagnetism centerless anchor clamps set for, play the effect of location, can also carry on spacingly to work piece 1 at rotatory in-process, keep off work piece 1 on two dogs all the time.
The mixed coating and writing device comprises a coating and writing mechanism and a mixing mechanism, wherein the coating and writing mechanism comprises a coating and writing head 2, the mixing mechanism uniformly mixes grinding fluid and grinding powder, and the coating and writing head 2 uniformly arranges the mixed grinding material on the processing surface of the workpiece 1 in a coating and writing mode. The mixing mechanism comprises a material box used for loading grinding liquid and grinding powder, a pipeline used for conveying and a high-pressure feeder used for conveying the grinding mixture to the painting head 2. Specifically, in this embodiment, regarding the mixed mode of two kinds of abrasives, accessible venturi realizes, through two pipelines with venturi intercommunication with lapping liquid and abrasive powder transmission to venturi in to realize the mixture of abrasives, the rethread pipeline is carried to scribbling in writing head 2. Of course, other techniques available in the art can be used to mix the two abrasives.
Further, the coating and writing head 2 mainly transfers the grinding mixture to the surface of the workpiece 1 in a coating and writing manner, in this embodiment, since the workpiece 1 continuously rotates, the coating and writing head 2 continuously outputs the grinding mixture after being close to the surface of the workpiece 1, thereby realizing coating and writing of the reverse position. Of course, the coating head 2 can also be used in other technical ways known in the art.
The high-pressure injection device comprises a hopper for loading steel balls 5 to be injected, a high-speed nozzle 3 for injecting the high-speed steel balls 5 to the surface of the workpiece 1 and a high-pressure suction mechanism for sucking the steel balls 5 from the hopper to the high-speed nozzle 3. Further, the specific structure can refer to the technical means disclosed in the patent with the publication number of CN104942664B or other related techniques in the prior art.
Referring to fig. 1, after the electromagnetic centerless clamp clamps and fixes the workpiece 1, the workpiece 1 is vertically placed, and the axis of the workpiece extends along the horizontal direction; the high-speed spray head 3 and the painting head 2 are positioned above the workpiece 1 and are inclined from top to bottom toward the processing surface of the workpiece 1. Through the structure, the steel balls 5 are effectively guaranteed to be collected after being impacted, the coating and writing modes of the coating and writing head 2 above and below the workpiece 1 are realized, and the workpiece 1 is convenient to receive the coating and writing of the coating and writing head 2. Specifically, the clamping manner of the electromagnetic centerless clamp can refer to the prior art of electromagnetic clamps, such as a bearing reinforced grinding machine disclosed in the invention patent with the publication number of CN104942664B and a related technology of a reinforced grinding processing method of a wheel tooth-shaped workpiece disclosed in the invention application with the publication number of CN 109176318A.
Further, the high-speed spray head 3 and the coating head 2 are respectively arranged on two sides of a vertical surface passing through the axis of the workpiece 1; in the direction of rotation, the work surface to be coated of the workpiece 1 is rotated from the front of the coating head 2 from bottom to top about its center of rotation. Thus, after the coating head 2 coats the abrasive mixture on the surface of the work 1, the abrasive mixture can be stably attached to the surface of the work 1 without being easily detached, based on the gravity and the adhesive force (greater than the centrifugal force) of the abrasive mixture itself.
Specifically, the rotary driving mechanism includes a rotary driving motor, a transmission rod and the like, and the specific structure can refer to the technical means for realizing rotation in the prior art.
The axial driving mechanism comprises an axial driving motor and a screw rod transmission assembly, and the specific structure can refer to the technical means for realizing linear transmission in the prior art.
Referring to fig. 1 and 2, the working principle of the reinforced grinding processing equipment is as follows:
when the electromagnetic centerless fixture works, a workpiece 1 (such as an inner ring of a bearing) is clamped on the electromagnetic centerless fixture and is rotationally driven by a rotary driving mechanism; the grinding fluid and the grinding powder are uniformly mixed through a mixing mechanism to obtain a semi-fluid mixture, the mixture is arranged on the processing surface of the workpiece 1 in a coating (painting) mode through a coating and writing head 2, and finally the surface of the workpiece 1 adhered with the mixture is impacted through a high-speed steel ball 5, so that a strengthened grinding layer is formed on the surface of the workpiece 1. Specifically, in the process of rotating the workpiece 1, the metal steel balls 5 carry huge kinetic energy to impact the surface to be processed at a certain angle at random and with equal probability, and as the grinding powder (composed of brown corundum 6 with the size smaller than that of the steel balls 5) is uniformly adhered to the surface of the workpiece 1, the steel balls 5 directly impact the grinding powder, the grinding powder with a tiny contact surface can form huge instantaneous impact, when the impact strength is greater than the dynamic yield strength of the surface of the workpiece 1, the surface of the workpiece 1 can generate plastic deformation, the plastic deformation in the impact propagation direction has a certain depth, after the impact is finished, the periphery only generates elastic deformation, the extrusion of plastic deformation tissue recovery is not generated, and the impact area can form residual compressive stress; meanwhile, the grinding powder is separated from and takes away part of the target surface material, micro-cutting is generated on the target surface, the micro-cutting tends to be uniform after repeated processing for many times to achieve a macroscopic grinding effect, and finally the effect of strengthening the processing surface in the grinding process is achieved.
Referring to fig. 1-2, a method for enhanced grinding a surface of a painted metal workpiece in the present embodiment includes the following steps:
(1) a workpiece 1 (such as an inner ring of a bearing) is placed on two limit stops 4, and the back surface of the workpiece 1 is ensured to be attached to a plane supporting plate of the electromagnetic centerless fixture. Wherein, loosen two limit stop 4 first, hug closely the plane backup pad with work piece 1 and move suitable position, the position that the eccentricity e is in the specified range, move one of them limit stop 4 to the position of hugging closely work piece 1 again, screw up the dog fixation nut, move another limit stop 4 according to this example, make it hug closely work piece 1 and screw up the nut and fix to the position of two limit stop 4 has been adjusted according to the size of this work piece 1.
(2) The electromagnetic centerless clamp is electrified to generate magnetic force, so that the workpiece 1 is adsorbed on the plane supporting plate.
(3) Starting the rotary driving mechanism to drive the electromagnetic centerless fixture to rotate, because the center O of the workpiece 11And the center O of the electromagnetic centerless clamp has an eccentricity, so that the magnetic force generated by the electromagnetic centerless clamp generates relative sliding relative to the plane of the workpiece 1, and forms relative friction force and driving force, thereby enabling the workpiece 1 to rotate. Meanwhile, the rotary driving mechanism is started, the workpiece 1 is driven to do linear motion along the axial direction while doing rotary motion, so that the workpiece can do transverse motion relative to the coating and writing head 2 and the high-speed spray head 3, and under the condition that the coating and writing head 2 and the high-speed spray head 3 are not moved, the coating and writing of the coating and writing head 2 and the impact of the high-speed spray head 3 are received transversely and circularly back and forth, so that the effect of strengthening processing is improved.
(4) Starting a mixing and painting device, and mixing the grinding powder and the grinding fluid in a ratio of 1: 1 to form a semi-fluid mixture; the mixed abrasive is coated and written on the processing surface of the workpiece 1 which rotates continuously through the coating and writing head 2, and the grinding powder is uniformly adhered on the processing surface of the workpiece 1 through the self adhesive force of the grinding fluid; wherein, because the lapping liquid has certain viscosity and polarity, therefore can wrap up the abrasive powder fully, guaranteed that the mixture can not atomize at the injection in-process to avoid the granule suspension polluted environment in the air, had stronger adsorption affinity to metal workpiece 1 surface simultaneously, make the abrasive powder can be attached to and not drop on rotatory workpiece 1 surface.
(5) After the mixed scribbling device stably runs, starting the high-pressure injection device, accelerating the steel balls 5 with large mass to a relatively high speed, and injecting the steel balls to the surface of the workpiece 1; when the steel balls 5 carrying huge kinetic energy are contacted with the grinding powder (brown corundum 6 with strong hardness and wear resistance and 120 meshes) with tiny volume, the kinetic energy is transmitted within a very short time, the kinetic energy is reduced from a very large value to zero within a very short time and bounces in the opposite direction, strong impact is formed on the surface of the workpiece 1, and then a strengthened grinding layer is formed on the surface.
Further, in this embodiment, the collision effect of the steel ball 5 is studied according to a theoretical formula, and is known from collision mechanics:
wherein: m is1Is the mass v of the steel ball 51The speed of the ball 5 after collision, i.e. the speed v1＝0，v2The projectile impact velocity, F the average impact force generated during contact, F*Is the reaction force to which the steel ball 5 is subjected at the time of collision.
It is understood from this that the collision force is not only positively correlated with the speed of the colliding object but also proportional to the mass of the colliding object, and the grinding powder has a large speed but also a small mass and a small impact force, and the steel balls 5 have a large mass and a large impact force. Simultaneously, impact stress's size is not only relevant with the impact force, still relevant with the area of contact when assaulting the collision, for research convenience, supposes that the abrasive powder is the spheroid (actually is irregular polyhedron, and the contact stress is bigger under the same pressure), then knows by sphere and plane Hertz contact theory:
wherein: a is the radius of the contact circle,μ1，μ2and E1，E2Poisson's ratio and modulus of elasticity, R, of two balls in contact, respectively0For the radius of the ball in contact, then:
from the above formula, the magnitude of the stress of the spherical and planar contact is
Inversely, when the impact force is the same, the smaller the radius, the greater the impact stress.
Therefore, compared with the case of simply impacting with the steel balls 5, referring to fig. 2, in the present embodiment, the steel balls 5 are used to impact the grinding powder attached to the surface of the workpiece 1, when the steel balls 5 and the grinding powder collide with each other and move together in the direction of the target surface, the grinding powder and the steel balls 5 can be regarded as a whole, at this time, the combination of the steel balls 5 and the grinding powder has the large mass of the steel balls 5, the collision of the steel balls 5, the mixture of the grinding powder and the target surface has the same impact force as the collision of the steel balls 5 and the target surface, the radius of the contact point of the mixture of the steel balls 5 and the grinding powder and the target surface is smaller than that of the contact point of the steel balls 5 and the target surface (the grinding powder has only 1/20-1/10 times of the diameter of.
The composition of the grinding powder and the grinding fluid can refer to the prior art, for example, the invention application with the application publication number of CN 109681532A discloses a composite processing method of the roller bearing inner ring.
The present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.
Claims (9)
1. A coating-writing type metal workpiece surface strengthening grinding processing method is characterized by comprising the following steps:
(1) clamping a workpiece to be processed on an electromagnetic centerless fixture, so that a high-speed spray head of a high-pressure spraying device and a coating head of a mixed coating device are aligned to the processing surface of the workpiece;
(2) starting a rotary driving mechanism to drive the electromagnetic centerless fixture to rotate, and then driving a workpiece to be machined to rotate;
(3) starting the mixed coating and writing device, mixing the grinding powder and the grinding fluid, coating and writing the mixed grinding material on the processing surface of the workpiece which continuously rotates through the coating and writing head, and stably and uniformly adhering the grinding powder on the processing surface of the workpiece through the self adhesive force of the grinding fluid;
(4) and starting the high-pressure injection device, injecting the steel balls to the processing surface of the workpiece adhered with the mixed abrasive at a high speed, circularly rotating the workpiece along with the rotary driving mechanism, directly impacting the abrasive powder adhered to the surface of the workpiece after the high-speed steel balls approach the processing surface of the workpiece, and strongly impacting the processing surface of the workpiece by the abrasive powder with smaller volume to form a strengthened grinding layer on the surface of the workpiece.
2. The method of claim 1, wherein in step (2), after the rotational driving mechanism is activated, the axial driving mechanism is activated to perform the linear motion along the axial direction of the workpiece while performing the rotational motion.
3. The method for strengthening and grinding the surface of a scribbled metal workpiece according to claim 1, wherein in the step (3), the grinding powder and the grinding fluid are mixed in a volume ratio of 1: 1 to form a semi-fluid mixture.
4. An apparatus for implementing the method for surface-enhanced grinding processing of the scribbled metal workpiece as defined in any one of claims 1 to 3, comprising a rotary clamping device for clamping the workpiece, a mixed scribbling device for evenly scribbling mixed abrasives on the processing surface of the workpiece, and a high-pressure jetting device for jetting high-speed steel balls to the processing surface of the workpiece, wherein the mixed abrasives are a semi-fluid mixture formed by mixing grinding fluid and grinding powder;
the rotary clamping device comprises an electromagnetic centerless clamp and a rotary driving mechanism for driving the electromagnetic centerless clamp to rotate; the mixed coating and writing device comprises a coating and writing mechanism and a mixing mechanism for uniformly mixing the grinding fluid and the grinding powder, wherein the coating and writing mechanism comprises a coating and writing head for uniformly arranging the mixed grinding material on the processing surface of the workpiece in a coating and writing manner; the high-pressure injection device comprises a high-speed spray head.
5. The coated metal workpiece surface strengthening grinding machining device of claim 4, wherein the rotary clamping device further comprises an axial driving mechanism for driving the electromagnetic centerless clamp to move axially.
6. The apparatus for surface-enhanced abrasive machining of a scribbled metal workpiece as claimed in claim 4, wherein said high pressure jetting means comprises a hopper for loading steel balls to be jetted, a high speed jetting head for jetting high speed steel balls to the surface of the workpiece, and a high pressure pumping mechanism for pumping the steel balls from the hopper to the high speed jetting head.
7. The coating-writing type metal workpiece surface strengthening grinding processing equipment as claimed in any one of claims 4-6, wherein after the workpiece is clamped and fixed by the electromagnetic centerless clamp, the workpiece is vertically placed, and the axis of the workpiece extends along the horizontal direction; the high-speed spray head and the coating head are positioned above the workpiece and face the processing surface of the workpiece from top to bottom in an inclined mode.
8. The apparatus for surface-enhanced abrasive machining of a coated metal workpiece according to claim 7, wherein the high-speed nozzle and the coating head are respectively provided on both sides of a vertical plane passing through an axis of the workpiece; in the direction of rotation, the work surface of the workpiece to be coated is rotated from the front of the coating head from bottom to top about its center of rotation.
9. The coated metal workpiece surface strengthening grinding processing device as claimed in claim 4, wherein the rotating and clamping device further comprises two limit stoppers for positioning the workpiece from bottom to top; wherein, two limit stop set up respectively in the both sides of the vertical face through the axis of work piece.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111843851A (en) * | 2020-07-21 | 2020-10-30 | 广州大学 | Hybrid reinforced grinding method for bearing processing |
| CN113977452A (en) * | 2021-11-02 | 2022-01-28 | 广州大学 | Universal self-centering flexible clamp for bearing inner ring reinforced grinding and grinding device |
| CN114367733A (en) * | 2022-02-11 | 2022-04-19 | 黄山学院 | Method and equipment for modifying and processing repairable stirring friction on surface layer of steel plate material |
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