CN104647189A - Device for mechanically grinding magnesium alloy and grinding method based on device - Google Patents
Device for mechanically grinding magnesium alloy and grinding method based on device Download PDFInfo
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- CN104647189A CN104647189A CN201510039589.0A CN201510039589A CN104647189A CN 104647189 A CN104647189 A CN 104647189A CN 201510039589 A CN201510039589 A CN 201510039589A CN 104647189 A CN104647189 A CN 104647189A
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- magnesium alloy
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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
- B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
- B24B31/06—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving oscillating or vibrating containers
- B24B31/064—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving oscillating or vibrating containers the workpieces being fitted on a support
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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
- B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
- B24B31/12—Accessories; Protective equipment or safety devices; Installations for exhaustion of dust or for sound absorption specially adapted for machines covered by group B24B31/00
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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
- B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
- B24B31/12—Accessories; Protective equipment or safety devices; Installations for exhaustion of dust or for sound absorption specially adapted for machines covered by group B24B31/00
- B24B31/14—Abrading-bodies specially designed for tumbling apparatus, e.g. abrading-balls
Abstract
The invention provides a device for mechanically grinding a magnesium alloy and a grinding method based on the device. The device comprises a platform, a treatment box, a motor, an electric control device and a vibration generator, wherein the vibration generator and the motor are both arranged on the platform; the electric control device is arranged on the outer sidewall of the treatment box; the treatment box is arranged on the surface of the vibration generator; an electric heating element is embedded into the sidewall of the treatment box; the treatment box is filled with shots; a rotating shaft is arranged in the sidewall in a penetration manner; a shaft type test piece fixture is fixedly arranged on the rotating shaft; the rotating shaft is driven by the motor to rotate through a driving wheel, a driven wheel and a transmission belt; the electric control device is electrically connected with the electric heating element. According to the device, the shaft type test piece fixture is simple and compact in structure, a test piece can be conveniently clamped or unloaded, and concentricity and parallelism with the rotating shaft can be effectively ensured.
Description
Technical field
The present invention relates to a kind of method and device of technical field of magnesium alloy surface treatment, specifically, what relate to is a kind of magnesium alloy high temperature surface mechanical grinding method and device.
Background technology
Metal material (as magnesium alloy) performance and its structure closely related, particularly fatigue fracture is very responsive to its surface state for some failure mode of material, lost efficacy mostly from surface, superficial layer or sub-surface, especially in stress concentration portion position, therefore surface texture state directly affects the materials'use life-span.In order to extend the service life of material and meet the instructions for use of particular surroundings, become crucial by improving material surface performance thus improving material monolithic performance.Based on this, people explore the method for multiple raising metal material fatigue resistant property, surface mechanical attrition is exactly one of them, its operation principle is under plus load effect, metal material surface coarse structure is refined to nanometer scale gradually by intense plastic strain, and once produced residual compressive stress on sub-surface, cause surface deformation strengthening.Surface mechanical attrition obtains system research in iron and steel and copper alloy, and achieves good effect.In addition, the Fatigue life improvement throughsurface nanostructuring of stainless steel by means of surface mechanical attrition treatment (surface mechanical attrition improves stainless fatigue life) that T.Roland etc. the 54th phase 1949-1954 page were delivered in 2006 at " Scripta Materialia " (material bulletin) have studied the impact of surface mechanical attrition on the fatigue behaviour of 316L stainless steel, result shows, surface mechanical attrition makes the stainless high-cycle fatigue strength of 316L improve 21%.But, up to now, the research about surface mechanical attrition treatment magnesium alloy is also considerably less, and this is main relevant with the crystal structure of magnesium alloy, and most magnesium alloy has Patterns for Close-Packed Hexagonal Crystal structure, and symmetry is low, and room temperature slip system is few, cold machine-shaping difficulty.During lower than 498K, the plastic deformation of polycrystalline magnesium is only limitted to basal slip and twin, owing to only having three geometry slip systems and two independent slip-system during magnesium alloy deformation, when deflection is larger along twinned region (especially when compressing) or the basal plane generation local transgranular fracture along large grain size, thus the cold deformation of magnesium alloy is made to be only limitted to medium deformation.And when higher than 498K, the additional slide surface of magnesium alloy and startup, be conducive to distortion, plasticity is improved, and is easy to formed machining.Therefore, if carry out surface mechanical attrition treatment to magnesium alloy under the high temperature conditions, i.e. high temperature surface mechanical attrition, is expected more effectively to improve its fatigue resistant property.
But when carrying out high temperature surface mechanical attrition treatment to magnesium alloy axle class standard sample, also there is following two problems: 1, how clamp axis class sample; 2, how homogeneous heating is carried out to axle class sample.
Through finding the literature search of prior art, Chinese invention patent is ZL200510053894.1, Authorization Notice No. is CN1668143B, the patent provides a kind of Work-piece heating arrangement, this device adopts high-frequency induction, can to sizes, the workpiece of shape, heat according to multiple continuous print mode, versatility is higher.The axle class sample but this device is not installed and rotatable fixture, cannot make magnesium alloy obtain uniform outer surface mechanical lapping, and this apparatus structure is complicated, and volume is large.
Summary of the invention
The object of the invention is to for defect of the prior art, a kind of magnesium alloy high temperature surface mechanical grinding method is provided, and developed a kind of device realizing the method, design heating temperature range is 0 ~ 400 DEG C, namely in high-temperature heater, surface mechanical attrition is carried out to magnesium alloy axle class sample, produce larger residual compressive stress at specimen surface, thus improve the fatigue behaviour of magnesium alloy by a larger margin.This apparatus structure is simple, and the efficiency of heating surface is high, and temperature homogeneity is good, can clamp axis class standard sample easily, is particularly suitable for light metal as magnesium alloy carries out high temperature surface mechanical attrition treatment.
The present invention is achieved by the following technical solutions:
On the one hand, the invention provides a kind of device magnesium alloy being carried out to mechanical lapping, it comprises platform, treatment box, motor, controller for electric consumption and vibration machine, described vibration machine and motor are all arranged on platform, described control device is arranged at the lateral wall for the treatment of box, described treatment box is arranged at the surface of vibration machine, electrical heating elements is embedded with in the sidewall for the treatment of box, the inside for the treatment of box is filled with bullet, turning cylinder is equipped with in described sidewall, described turning cylinder is installed with axle class specimen holder, described motor with pass through driving wheel, driven pulley and driving belt drive the rotation of turning cylinder, described controller for electric consumption and electrical heating elements electrically connect.
Preferably, described controller for electric consumption comprises piezoelectric ceramic piece, piezoelectric ceramic piece divider resistance, constant temperature bimetallic temperature controller, Light-Emitting Diode, Light-Emitting Diode divider resistance and power line, after described piezoelectric ceramic piece and piezoelectric ceramic piece divider resistance are in parallel with constant temperature bimetallic temperature controller after connecting, then connect with light emitting diode and light emitting diode divider resistance.
Preferably, described motor is electrically connected with a frequency modulator.
Preferably, sheet-metal layers, adiabatic flaggy and the insulating rubber layer composition that set gradually all from inside to outside of the sidewall of described treatment box and bottom.
Preferably, described bullet is the cannonball that mohs hardness is greater than 10.
Preferably, described bullet is ceramic pellet.
On the other hand, present invention also offers a kind of based on magnesium alloy Ginding process magnesium alloy being carried out to the device of mechanical lapping of the present invention, it comprises the steps:
Bullet and axle class magnesium alloy sample are put into treatment box, and magnesium alloy sample is fixed in axle class specimen holder;
Treatment box is heated, makes bullet and magnesium alloy sample reach more than magnesium alloy aging temp 50 ~ 100 DEG C;
Vibration on Start-up generator and motor, make the sample of projectile impact uniform rotation.
Preferably, when described magnesium alloy sample is non-magnesium-rare earth, aging temp is 150 ~ 200 DEG C; When described magnesium alloy sample is magnesium-rare earth, aging temp is 200 ~ 250 DEG C.
Preferably, described bullet diameter range is 1 ~ 5mm, and the vibration frequency range of described vibration machine is 10 ~ 1000Hz, and the rotational velocity range of described motor is 1 revolutions per second ~ 30 revolutions per seconds.
When the present invention works, first with metallic plate, heat-insulating shield and insulating rubber composition treatment box, and some electrical heating elements are placed between the heat-insulating shield for the treatment of box and metallic plate, electrical heating elements is connected with the controller for electric consumption electricity of outside; Then treatment box is placed on vibration machine top, and is connected with axle class sample rotating device; Six tack dog screws on rotating shaft class specimen holder clamp axle class magnesium alloy sample to be processed; Startup electric heating system heating bullet and sample are to assigned temperature, then the vibration machine in surface mechanical attrition system and the rotary electric machine in axle class sample rotating device is started, make the sample of projectile impact uniform rotation, realize the high temperature surface mechanical attrition of magnesium alloy sample.
Compared with prior art, the present invention has following beneficial effect:
Axle class specimen holder in the present invention is simple and compact for structure, and clamping or unloading sample conveniently, and can effectively ensure and the concentricity of turning cylinder and the depth of parallelism; Meanwhile, if by the drive of rotary electric machine, sample achieves and at the uniform velocity rotates, and obtains thermally equivalent in the good treatment box of thermal insulation, and sample can be made to obtain even, stable high temperature surface mechanical attrition effect.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is plan structure schematic diagram of the present invention;
Fig. 2 is side view of the present invention;
Fig. 3 is the control system partial schematic diagram of specimen heating system of the present invention;
Fig. 4 is axle class specimen holder partial schematic diagram of the present invention;
In figure: 1, motor, 2, frequency modulator, 3, platform, 4, belt, 5, driving wheel, 6, driven pulley, 7, bearing, 8, turning cylinder, 9, hexagon socket cap head screw, 10, axle class specimen holder, 11, sample, 12, bullet, 13, electrical heating elements, 14, treatment box, 15, controller for electric consumption, 16, light emitting diode, 17, power line, 18, vibration machine, 19, piezoelectric ceramic piece, 20, piezoelectric ceramic piece divider resistance, 21, constant temperature bimetallic temperature controller, 22, light emitting diode divider resistance, 23, tack dog screw.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
A kind of structure of magnesium alloy being carried out to the device of mechanical lapping provided by the invention as depicted in figs. 1 and 2, platform 3 is provided with motor 1 and vibration machine 18, the surface of vibration machine 18 is provided with treatment box 14, the sidewall for the treatment of box 14 is by the sheet-metal layers from inside to outside set gradually, adiabatic flaggy and insulating rubber layer composition, controller for electric consumption 15 is arranged at the side-wall outer side for the treatment of box 14, electrical heating elements 13 is embedded in the sidewall for the treatment of box, between heat-insulating shield and metallic plate, and be electrically connected in controller for electric consumption 15, the inside for the treatment of box 14 is filled with the spherical ceramic bullet 12 that mohs hardness is greater than 10, turning cylinder 8 is located on the sidewall for the treatment of box 14 by bearing 7, axle class specimen holder 10 is installed on turning cylinder 8 by hexagon socket cap head screw 9, motor 1 and turning cylinder 8 are respectively equipped with driving wheel 5 and driven pulley 6, belt 4 is nested with between driving wheel 5 and driven pulley 6, motor 1 is electrically connected with a frequency modulator 2.
Wherein, the structure of controller for electric consumption as shown in Figure 3, comprise piezoelectric ceramic piece 19, piezoelectric ceramic piece divider resistance 20, constant temperature bimetallic temperature controller 21, Light-Emitting Diode 16, Light-Emitting Diode divider resistance 22 and power line 17, piezoelectric ceramic piece 19 and piezoelectric ceramic piece divider resistance 20 are in parallel with constant temperature bimetallic temperature controller 21 after connecting, and entirety is connected with light emitting diode 16 and light emitting diode divider resistance 22 again.
During use, as shown in Figure 4, by tack dog screw 23, magnesium alloy sample 11 is fixed on axle class specimen holder 10.
embodiment 1
The present embodiment relates to a kind of magnesium alloy high temperature surface mechanical grinding method, comprises the steps:
The present embodiment adopts As-extruded ZK60 (Mg-6Zn-0.5Zr) magnesium alloy.
Step one, be that bullet and the axle class magnesium alloy sample of 1 millimeter puts into treatment box by diameter, magnesium alloy sample is fixed in axle class specimen holder;
Step 2, utilizes electric heating system to heat treatment box, makes bullet and ZK60 (Mg-6Zn-0.5Zr) magnesium alloy sample reach 150 DEG C;
Step 3, start the vibration machine in surface mechanical attrition system and the rotary electric machine in axle class sample rotating device, make ZK60 (Mg-6Zn-0.5Zr) magnesium alloy sample of projectile impact uniform rotation, the vibration frequency of vibration machine is 1000Hz, and the rotary electric machine rotary speed of axle class sample rotating device is 30 revolutions per seconds.
Implementation result: the surface deformation later performance of ZK60 (Mg-6Zn-0.5Zr) magnesium alloy sample after high temperature surface mechanical attrition is tested, wherein, maximum residual stress is 96MPa, and surface roughness Ra is about 1.4m, and deformation layer microhardness increase rate is 52HV0.05; Carried out 107 fatigue strength tests to fatigue testing specimen, its 107 fatigue strength bring up to 195MPa from the 140MPa before high temperature surface mechanical attrition, improve 55MPa.
Conventional method: get As-extruded ZK60 (Mg-6Zn-0.5Zr) magnesium alloy, under room temperature, Vibration on Start-up generator drives the bullet of 1 millimeter to impact ZK60 (Mg-6Zn-0.5Zr) magnesium alloy sample on the surface, the vibration frequency of vibration machine is 1000Hz, and the rotary electric machine rotary speed of axle class sample rotating device is 30 revolutions per seconds.The surface deformation later performance of ZK60 (Mg-6Zn-0.5Zr) magnesium alloy sample after room temperature surface mechanical attrition is tested, wherein, maximum residual stress is 72MPa, and surface roughness Ra is about 1.2m, and deformation layer microhardness increase rate is 43HV0.05; Carry out 107 fatigue strength tests to the fatigue testing specimen after room temperature surface mechanical attrition, they are 10 years old
7secondary fatigue strength brings up to 185MPa from the 140MPa before room temperature surface mechanical attrition, improves 45MPa.
The surface deformation later performance of ZK60 (Mg-6Zn-0.5Zr) magnesium alloy and fatigue strength after high temperature surface mechanical attrition and room temperature surface mechanical attrition treatment, relatively traditional room temperature surface mechanical attrition method, after high temperature surface mechanical attrition treatment of the present invention, larger residual compressive stress and microhardness can be produced, and the stability of residual stress can be strengthened, further increase the surface mechanical attrition strengthening effect of ZK60 (Mg-6Zn-0.5Zr) magnesium alloy.
embodiment 2
The present embodiment relates to a kind of magnesium alloy high temperature surface mechanical grinding method, comprises the steps:
The present embodiment adopts As-extruded AZ31 (Mg-3Al-1Zn) magnesium alloy.
Step one, be that bullet and the axle class magnesium alloy sample of 5 millimeters puts into treatment box by diameter, magnesium alloy sample is fixed in axle class specimen holder;
Step 2, utilizes electric heating system to heat treatment box, makes bullet and AZ31 (Mg-3Al-1Zn) magnesium alloy sample reach 250 DEG C;
Step 3, start the vibration machine in surface mechanical attrition system and the rotary electric machine in axle class sample rotating device, make AZ31 (Mg-3Al-1Zn) magnesium alloy sample of projectile impact uniform rotation, the vibration frequency of vibration machine is 10Hz, and the rotary electric machine rotary speed of axle class sample rotating device is 1 revolutions per second.
Implementation result: the surface deformation later performance of AZ31 (Mg-3Al-1Zn) magnesium alloy sample after high temperature surface mechanical attrition is tested, wherein, maximum residual stress is 99MPa, and surface roughness Ra is about 1.3m, and deformation layer microhardness increase rate is 54HV0.05; Carried out 107 fatigue strength tests to fatigue testing specimen, its 107 fatigue strength bring up to 150MPa from the 100MPa before high temperature surface mechanical attrition, improve 50MPa.
Conventional method: get As-extruded AZ31 (Mg-3Al-1Zn) magnesium alloy, under room temperature, Vibration on Start-up generator drives the bullet of 5 millimeters to impact AZ31 (Mg-3Al-1Zn) magnesium alloy sample on the surface, the vibration frequency of vibration machine is 10Hz, and the rotary electric machine rotary speed of axle class sample rotating device is 1 revolutions per second.The surface deformation later performance of AZ31 (Mg-3Al-1Zn) magnesium alloy sample after room temperature surface mechanical attrition is tested, wherein, maximum residual stress is 79MPa, and surface roughness Ra is 1.1 μm, and deformation layer microhardness increase rate is 46HV0.05; 10 are carried out to the fatigue testing specimen after room temperature surface mechanical attrition
7secondary fatigue strength test, they are 10 years old
7secondary fatigue strength brings up to 140MPa from the 100MPa before room temperature surface mechanical attrition, improves 40MPa.
The surface deformation later performance of AZ31 (Mg-3Al-1Zn) magnesium alloy and fatigue strength after high temperature surface mechanical attrition and room temperature surface mechanical attrition treatment, relatively traditional room temperature surface mechanical attrition method, after high temperature surface mechanical attrition treatment of the present invention, larger residual compressive stress and microhardness can be produced, and the stability of residual stress can be strengthened, further increase the surface mechanical attrition strengthening effect of AZ31 (Mg-3Al-1Zn) magnesium alloy.
embodiment 3
The present embodiment relates to a kind of magnesium alloy high temperature surface mechanical grinding method, comprises the steps:
The present embodiment adopts As-extruded GW103K (Mg-10Gd-3Y-0.5Zr) magnesium alloy.
Step one, be that bullet and the axle class magnesium alloy sample of 1 millimeter puts into treatment box by diameter, magnesium alloy sample is fixed in axle class specimen holder;
Step 2, utilizes electric heating system to heat treatment box, makes bullet and GW103K (Mg-10Gd-3Y-0.5Zr) magnesium alloy sample reach 200 DEG C;
Step 3, start the vibration machine in surface mechanical attrition system and the rotary electric machine in axle class sample rotating device, make GW103K (Mg-10Gd-3Y-0.5Zr) magnesium alloy sample of projectile impact uniform rotation, the vibration frequency of vibration machine is 1000Hz, and the rotary electric machine rotary speed of axle class sample rotating device is 30 revolutions per seconds.
Implementation result: the surface deformation later performance of GW103K (Mg-10Gd-3Y-0.5Zr) magnesium alloy sample after high temperature surface mechanical attrition is tested, wherein, maximum residual stress is 130MPa, surface roughness Ra is about 1.6m, and deformation layer microhardness increase rate is 71HV0.05; Carried out 107 fatigue strength tests to fatigue testing specimen, its 107 fatigue strength bring up to 225MPa from the 150MPa before high temperature surface mechanical attrition, improve 75MPa.
Conventional method: get As-extruded GW103K (Mg-10Gd-3Y-0.5Zr) magnesium alloy, under room temperature, Vibration on Start-up generator drives the bullet of 1 millimeter to impact GW103K (Mg-10Gd-3Y-0.5Zr) magnesium alloy sample on the surface, the vibration frequency of vibration machine is 1000Hz, and the rotary electric machine rotary speed of axle class sample rotating device is 30 revolutions per seconds.The surface deformation later performance of GW103K (Mg-10Gd-3Y-0.5Zr) magnesium alloy sample after room temperature surface mechanical attrition is tested, wherein, maximum residual stress is 115MPa, and surface roughness Ra is about 1.4m, and deformation layer microhardness increase rate is 53HV0.05; 10 are carried out to the fatigue testing specimen after room temperature surface mechanical attrition
7secondary fatigue strength test, its 107 fatigue strength bring up to 210MPa from the 150MPa before room temperature surface mechanical attrition, improve 60MPa.
As can be seen from surface deformation later performance and the fatigue strength of high temperature surface mechanical attrition and room temperature surface mechanical attrition treatment GW103K (Mg-10Gd-3Y-0.5Zr) magnesium alloy, relatively traditional room temperature surface mechanical attrition method, after high temperature surface mechanical attrition treatment of the present invention, larger residual compressive stress and microhardness can be produced, and the stability of residual stress can be strengthened, further increase the surface mechanical attrition strengthening effect of GW103K (Mg-10Gd-3Y-0.5Zr) magnesium alloy.
embodiment 4
The present embodiment relates to a kind of magnesium alloy high temperature surface mechanical grinding method, comprises the steps:
The present embodiment adopts As-extruded GW123K (Mg-12Gd-3Y-0.5Zr) magnesium alloy.
Step one, be that bullet and the axle class magnesium alloy sample of 5 millimeters puts into treatment box by diameter, magnesium alloy sample is fixed in axle class specimen holder;
Step 2, utilizes electric heating system to heat treatment box, makes bullet and GW123K (Mg-12Gd-3Y-0.5Zr) magnesium alloy sample reach 350 DEG C;
Step 3, start the vibration machine in surface mechanical attrition system and the rotary electric machine in axle class sample rotating device, make GW123K (Mg-12Gd-3Y-0.5Zr) magnesium alloy sample of projectile impact uniform rotation, the vibration frequency of vibration machine is 10Hz, and the rotary electric machine rotary speed of axle class sample rotating device is 1 revolutions per second.
Implementation result: the surface deformation later performance of GW123K (Mg-12Gd-3Y-0.5Zr) magnesium alloy sample after high temperature surface mechanical attrition is tested, wherein, maximum residual stress is 142MPa, surface roughness Ra is about 1.7 μm, and deformation layer microhardness increase rate is 73HV0.05; 10 have been carried out to fatigue testing specimen
7secondary fatigue strength test, they are 10 years old
7secondary fatigue strength brings up to 225MPa from the 155MPa before high temperature surface mechanical attrition, improves 70MPa.
Conventional method: get As-extruded GW123K (Mg-12Gd-3Y-0.5Zr) magnesium alloy, under room temperature, Vibration on Start-up generator drives the bullet of 5 millimeters to impact GW123K (Mg-12Gd-3Y-0.5Zr) magnesium alloy sample on the surface, the vibration frequency of vibration machine is 10Hz, and the rotary electric machine rotary speed of axle class sample rotating device is 1 revolutions per second.The surface deformation later performance of GW123K (Mg-12Gd-3Y-0.5Zr) magnesium alloy sample after room temperature surface mechanical attrition is tested, wherein, maximum residual stress is 119MPa, and surface roughness Ra is about 1.7 μm, and deformation layer microhardness increase rate is 59HV0.05; 10 are carried out to the fatigue testing specimen after room temperature surface mechanical attrition
7secondary fatigue strength test, they are 10 years old
7secondary fatigue strength brings up to 215MPa from the 155MPa before room temperature surface mechanical attrition, improves 60MPa.
As can be seen from surface deformation later performance and the fatigue strength of high temperature surface mechanical attrition and room temperature surface mechanical attrition treatment GW123K (Mg-12Gd-3Y-0.5Zr) magnesium alloy, relatively traditional room temperature surface mechanical attrition method, after high temperature surface mechanical attrition treatment of the present invention, larger residual compressive stress and microhardness can be produced, and the stability of residual stress can be strengthened, further increase the surface mechanical attrition strengthening effect of GW123K (Mg-12Gd-3Y-0.5Zr) magnesium alloy.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (9)
1. one kind is carried out the device of mechanical lapping to magnesium alloy, it is characterized in that, comprise platform, treatment box, motor, controller for electric consumption and vibration machine, described vibration machine and motor are all arranged on platform, described control device is arranged at the lateral wall for the treatment of box, described treatment box is arranged at the surface of vibration machine, electrical heating elements is embedded with in the sidewall for the treatment of box, the inside for the treatment of box is filled with bullet, turning cylinder is equipped with in described sidewall, described turning cylinder is installed with axle class specimen holder, described motor with pass through driving wheel, driven pulley and driving belt drive the rotation of turning cylinder, described controller for electric consumption and electrical heating elements electrically connect.
2. device magnesium alloy being carried out to mechanical lapping as claimed in claim 1, it is characterized in that, described controller for electric consumption comprises piezoelectric ceramic piece, piezoelectric ceramic piece divider resistance, constant temperature bimetallic temperature controller, Light-Emitting Diode, Light-Emitting Diode divider resistance and power line, after described piezoelectric ceramic piece and piezoelectric ceramic piece divider resistance are in parallel with constant temperature bimetallic temperature controller after connecting, then connect with light emitting diode and light emitting diode divider resistance.
3. device magnesium alloy being carried out to mechanical lapping as claimed in claim 1, is characterized in that, described motor is electrically connected with a frequency modulator.
4. device magnesium alloy being carried out to mechanical lapping as claimed in claim 1, is characterized in that, the sheet-metal layers that the sidewall of described treatment box and bottom set gradually all from inside to outside, adiabatic flaggy and insulating rubber layer form.
5. device magnesium alloy being carried out to mechanical lapping as claimed in claim 1, it is characterized in that, described bullet is the cannonball that mohs hardness is greater than 10.
6. device magnesium alloy being carried out to mechanical lapping as claimed in claim 5, it is characterized in that, described bullet is ceramic pellet.
7., based on Ginding process magnesium alloy being carried out to the device of mechanical lapping according to any one of claim 1 ~ 6, it is characterized in that, comprise the steps:
Bullet and axle class magnesium alloy sample are put into treatment box, and magnesium alloy sample is fixed in axle class specimen holder;
Treatment box is heated, makes bullet and magnesium alloy sample reach more than magnesium alloy aging temp 50 ~ 100 DEG C;
Vibration on Start-up generator and motor, make the sample of projectile impact uniform rotation.
8. the method for grinding as claimed in claim 7, it is characterized in that, when described magnesium alloy sample is non-magnesium-rare earth, aging temp is 150 ~ 200 DEG C; When described magnesium alloy sample is magnesium-rare earth, aging temp is 200 ~ 250 DEG C.
9. the method for grinding as claimed in claim 7, it is characterized in that, described bullet diameter range is 1 ~ 5mm, and the vibration frequency range of described vibration machine is 10 ~ 1000Hz, and the rotational velocity range of described motor is 1 revolutions per second ~ 30 revolutions per seconds.
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| CN109382767A (en) * | 2018-09-19 | 2019-02-26 | 廊坊市北方天宇机电技术有限公司 | A kind of full processing procedure grinding and polishing method and apparatus of aluminium alloy wheel hub |
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| CN110757330A (en) * | 2019-10-18 | 2020-02-07 | 广州大学 | Electromagnetic reinforced grinding equipment for machining roller path of cylindrical thrust roller bearing |
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| WO2021070024A1 (en) * | 2019-10-10 | 2021-04-15 | 3M Innovative Properties Company | Method of modifying a surface of a workpiece |
| CN116100455A (en) * | 2023-03-20 | 2023-05-12 | 西安航天动力研究所 | Longitudinal polishing device and longitudinal polishing method for fatigue test sample |
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| IT201800009904A1 (en) * | 2018-10-30 | 2020-04-30 | Rösler Italiana Srl | Support, machine and process for surface finishes |
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Application publication date: 20150527 |