CN110303414B - Axial polishing device for fatigue test bar and using method thereof - Google Patents
Axial polishing device for fatigue test bar and using method thereof Download PDFInfo
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- CN110303414B CN110303414B CN201910585637.4A CN201910585637A CN110303414B CN 110303414 B CN110303414 B CN 110303414B CN 201910585637 A CN201910585637 A CN 201910585637A CN 110303414 B CN110303414 B CN 110303414B
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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
- B24B27/00—Other grinding machines or devices
- B24B27/0023—Other grinding machines or devices grinding machines with a plurality of working posts
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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
- B24B27/00—Other grinding machines or devices
- B24B27/0076—Other grinding machines or devices grinding machines comprising two or more grinding tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
- B24B29/02—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces
- B24B29/04—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces for rotationally symmetrical workpieces, e.g. ball-, cylinder- or cone-shaped workpieces
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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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/007—Weight compensation; Temperature compensation; Vibration damping
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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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/061—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically
- B24B41/062—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically between centres; Dogs
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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
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/02—Drives or gearings; Equipment therefor for performing a reciprocating movement of carriages or work- tables
- B24B47/04—Drives or gearings; Equipment therefor for performing a reciprocating movement of carriages or work- tables by mechanical gearing only
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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
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
- B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention provides an axial polishing device for a fatigue test bar, which comprises a supporting component, an axial moving component, a clamping component and a polishing component, wherein the axial moving component and the polishing component are arranged on the supporting component; the axial movement component comprises a supporting plate, an axial guide rail and an axial movement driving mechanism, the axial guide rail and the axial movement driving mechanism are arranged on the supporting component, the supporting plate is arranged on the axial guide rail and can move along the axial guide rail, the axial movement driving mechanism is connected with the supporting plate, the supporting plate is driven by the axial movement driving mechanism to move, and the clamping component is arranged on the supporting plate; the device is small and exquisite in size, simple in structure, convenient to operate, high in polishing efficiency and capable of quickly and effectively achieving axial polishing treatment of the fatigue test bar.
Description
Technical Field
The invention relates to a machining and surface treatment technology of an axial fatigue test bar made of a metal material, in particular to an axial polishing device of the fatigue test bar and a using method thereof.
Background
The test and research of the fatigue property of the metal material have important significance for a plurality of important industrial fields including aviation, aerospace, automobiles, ships and the like. Fatigue is a failure mode that is highly sensitive to the material surface quality and condition, and therefore requires a special low-stress polishing procedure to ensure that the test piece surface residual stress range is in a low-stress condition and the axial surface roughness is sufficiently low. At present, relevant enterprise standards of foreign aeroengine manufacturers (for example, GE P1TF79, MSRR 9968, SNECMA and the like) all require that a fatigue test piece must be subjected to axial polishing treatment. Similar provisions have been made for NADCAP AC Checklist (including AC Checklist 7101/3 and AC Checklist 7101/7). The international and domestic standards relating to the axial fatigue test of metallic materials (e.g., ASTM-E466, GB/T3075, etc.) also require that the final step of the mechanical processing flow of the test piece must be polished in the axial direction of the test piece until the axial surface roughness of the test piece is not greater than Ra0.2 μm. The existing axial polishing device for the fatigue test bar has the problems of large volume, complex structure, high cost, low polishing efficiency and the like. Therefore, there is a need to develop a new type of axial polishing device for fatigue test bars to overcome the above-mentioned drawbacks.
Disclosure of Invention
The invention aims to provide an axial polishing device for a fatigue test bar and a using method thereof, so that the structure is simplified, the operation is convenient, and the polishing efficiency is improved.
The technical scheme adopted by the invention for solving the technical problem is as follows:
an axial polishing device for a fatigue test bar comprises a supporting component, an axial moving component, a clamping component and a polishing component, wherein the axial moving component and the polishing component are arranged on the supporting component;
in particular, the amount of the solvent to be used,
the axial movement component comprises a supporting plate, an axial guide rail and an axial movement driving mechanism, the axial guide rail and the axial movement driving mechanism are arranged on the supporting component, the supporting plate is arranged on the axial guide rail and can move along the axial guide rail, the axial movement driving mechanism is connected with the supporting plate, the supporting plate is driven by the axial movement driving mechanism to move, and the clamping component is arranged on the supporting plate;
two ends of the axial guide rail are respectively fixed on the supporting assembly, each axial guide rail is respectively provided with a guide block, the shape of each guide block is matched with that of the axial guide rail, and each guide block is fixed on the bottom surface of the supporting plate, so that the supporting plate can move along the axial guide rail through the guide block;
the clamping assembly comprises a fixed clamping plate, a movable clamping plate and an adjusting guide rail, the fixed clamping plate and the adjusting guide rail are fixedly arranged on the top surface of the supporting plate, the movable clamping plate is arranged on the adjusting guide rail and can move along the adjusting guide rail, the adjusting guide rail is parallel to the axial guide rail of the axial moving assembly, and the fatigue test bar is arranged between the fixed clamping plate and the movable clamping plate;
the fixed splint is provided with a low-speed motor and a chuck, and a power output shaft of the low-speed motor is connected with the chuck;
the ejector pin is arranged on one side, facing the chuck, of the movable clamping plate, the adjusting guide seat is arranged at the bottom of the movable clamping plate, the adjusting guide seat is matched with the adjusting guide rail in shape, the movable clamping plate moves along the adjusting guide rail through the adjusting guide seat, and the adjusting guide seat is internally provided with a fastening bolt which can fix the adjusting guide seat on the adjusting guide rail;
one end of the fatigue test bar is clamped on the chuck, the other end of the fatigue test bar is propped against by the thimble, after the tightening bolt on the adjusting guide seat is locked, the position of the thimble is fixed, and the chuck, the fatigue test bar and the thimble are driven to rotate together by the low-speed motor;
the polishing assembly comprises a gantry support, a polishing head and a pre-tightening spring, the gantry support consists of a cross beam and two stand columns, the cross beam stretches across the clamping assembly and the supporting assembly, and the polishing head is connected to the cross beam through the pre-tightening spring and is opposite to the middle gauge length position of the fatigue test rod below;
two upright posts of the gantry support are respectively inserted into the supporting assemblies and can move up and down to adjust the height of the gantry support;
the axial motion driving mechanism can adopt reciprocating motion mechanisms such as a crank-link mechanism and the like, in one embodiment of the invention, the axial motion driving mechanism comprises a high-speed motor, a crank, a link and a slide block, the high-speed motor is fixed on the support component, a power output shaft of the high-speed motor is fixedly connected with the crank, the power output shaft of the high-speed motor is mutually vertical to the axial guide rail, the crank is positioned below the axial guide rail, the axis of the crank and the axis of the axial guide rail are positioned on the same plane, the crank is driven by the high-speed motor to rotate, the tail end of the crank is rotationally connected with the link, the link is driven by the crank to reciprocate, the tail end of the link is rotationally;
in one embodiment of the invention, the supporting component comprises a pair of transverse supporting plates, a pair of axial supporting plates and a bottom plate, wherein the transverse supporting plates are parallel to each other, fixed on the bottom plate and vertical to the axial guide rail of the axial moving component, and two ends of the axial guide rail are respectively fixed on the inner walls of the transverse supporting plates;
the axial supporting plates are parallel to each other, fixed on the bottom plate and vertical to the transverse supporting plates, the outer sides of the axial supporting plates are provided with inserting grooves, the inserting grooves are matched with the stand columns of the gantry support, and the outer walls of the inserting grooves are provided with positioning bolts.
The using method of the fatigue test bar axial polishing device comprises the following steps:
(1) clamping one end of a fatigue test rod on a chuck;
(2) moving the movable clamping plate along the adjusting guide rail until the thimble props against the other end of the fatigue test bar, and screwing the fastening bolt to fix the position of the movable clamping plate;
(3) downwards moving the gantry support until the polishing head is pressed on the surface of the middle gauge length section of the fatigue test bar by a pre-tightening spring, and screwing a positioning bolt to fix the height of the gantry support;
(4) starting a high-speed motor to enable the fatigue test bar to perform axial high-speed reciprocating linear motion;
(5) starting a low-speed motor to enable the fatigue test bar to perform circumferential low-speed rotary motion;
(6) and (3) after polishing is finished, stopping the high-speed motor and the low-speed motor in sequence, loosening the positioning bolt, moving the gantry support upwards, loosening the fastening bolt, moving the movable clamping plate backwards to separate the thimble from the fatigue test bar, taking down the fatigue test bar, checking the roughness and residual stress of the surface of the fatigue test bar, finishing polishing if the requirements are met, and repeating the steps (1) to (5) if the requirements are not met until the requirements are met.
In the invention, the fatigue test bar is a cylinder, the tolerance of cylindricity in the full length range of the cylinder is not more than 0.01mm, the roughness of the surface of the cylinder is not more than Ra1.6 μm before polishing, and the roughness of the surface of the cylinder is not more than Ra0.2 μm after polishing;
the rotating speed of the high-speed motor is not lower than 600 r/min;
the rotating speed of the low-speed motor is not higher than 5 r/min;
the coaxiality of the whole body formed by the low-speed motor, the chuck, the fatigue test bar and the thimble in the axial direction is better than 0.005 mm/mm.
The invention has the advantages that:
1. the fatigue test bar axial polishing device utilizes the crank-slider mechanism to convert the continuous rotation of the high-speed motor into the axial high-speed reciprocating linear motion of the clamping assembly, and simultaneously adopts the low-speed motor to drive the fatigue test bar to slowly rotate between the chuck and the thimble, thereby simply and conveniently realizing the composite motion of the axial high-speed reciprocating motion and the circumferential low-speed rotating motion of the fatigue test bar and combining the polishing head to quickly realize the axial polishing of the fatigue test bar;
2. the contact force between the polishing head and the fatigue test bar is simply, conveniently and quickly adjusted by adjusting the height of the gantry support and combining the pre-tightening spring;
3. a plurality of stations are arranged, so that the axial polishing treatment of a plurality of fatigue test bars can be simultaneously carried out, and the polishing efficiency is obviously improved;
4. the device is small and exquisite in size, simple in structure, convenient to operate, low in use and maintenance cost and high in polishing efficiency, and has high practical value for quickly and effectively achieving axial polishing treatment of fatigue test bars.
Drawings
FIG. 1 is a schematic top view of an axial polishing device for a fatigue test bar according to the present invention;
FIG. 2 is a schematic view of the bottom structure of the fatigue test bar axial polishing device;
fig. 3 is a schematic structural view of the support assembly.
Detailed Description
In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easy to understand, the invention is further described with reference to the figures and the specific embodiments.
Example 1:
as shown in fig. 1 to 3, the axial polishing device for a fatigue test rod provided by the present invention includes a supporting component, an axial moving component, a clamping component and a polishing component, wherein the axial moving component and the polishing component are mounted on the supporting component, the clamping component is mounted on the axial moving component, the axial moving component drives the clamping component to move axially, the fatigue test rod is placed on the clamping component, the polishing component corresponds to the clamping component, and the polishing component performs axial polishing treatment on the fatigue test rod;
specifically, the axial moving assembly comprises a supporting plate 1, an axial guide rail 2 and an axial movement driving mechanism. The axial guide rail 2 and the axial motion driving mechanism are arranged on the supporting component, the supporting plate 1 is arranged on the axial guide rail 2 and can move along the axial guide rail 2, the axial motion driving mechanism is connected with the supporting plate 1, the axial motion driving mechanism drives the supporting plate 1 to move, and the clamping component is arranged on the supporting plate 1;
two ends of an axial guide rail 2 are respectively fixed on the supporting components, guide blocks 3 are respectively arranged on the axial guide rail 2, the shape of each guide block 3 is matched with that of the axial guide rail 2, and the guide blocks 3 are fixed on the bottom surface of the supporting plate 1 and can move along the axial guide rail 2;
the axial motion driving mechanism comprises a high-speed motor 4, a crank 5, a connecting rod 6 and a slide block 7. The high-speed motor 4 is fixed on the supporting component, a power output shaft of the high-speed motor 4 is fixedly connected with the crank 5, the power output shaft of the high-speed motor 4 is perpendicular to the axial guide rail 2, the crank 5 is positioned below the axial guide rail 2, the axis of the crank and the axis of the axial guide rail 2 are positioned on the same plane, the crank 5 is driven by the high-speed motor 4 to rotate, the tail end of the crank 5 is rotatably connected with the connecting rod 6, the connecting rod 6 is driven by the crank 5 to reciprocate, the tail end of the connecting rod 6 is rotatably connected with the sliding block 7, the sliding block 7 is fixed on the bottom surface of;
the centre gripping subassembly includes solid fixed splint 8, removes splint 9, adjusts guide rail 10, and solid fixed splint 8 and regulation guide rail 10 fixed mounting are in 1 top surface of layer board, and remove splint 9 and install on adjusting guide rail 10 to can follow and adjust guide rail 10 and remove. The adjusting guide rail 10 is parallel to the axial guide rail 2 of the axial moving assembly, and the fatigue test bar 11 is arranged between the fixed clamping plate 8 and the moving clamping plate 9;
the fixed splint 8 is provided with a low-speed motor 14, and a power output shaft of the low-speed motor 14 is connected with the chuck 12;
the movable clamp plate 9 is provided with a thimble 13 towards one side of the chuck 12, the bottom of the movable clamp plate is provided with an adjusting guide seat 15, the adjusting guide seat 15 is matched with the adjusting guide rail 10 in shape, the movable clamp plate 9 can move along the adjusting guide rail 10 through the adjusting guide seat 15, a fastening bolt 16 is arranged on the adjusting guide seat 15, and the adjusting guide seat 15 can be fixed on the adjusting guide rail 10;
one end of the fatigue test bar 11 is clamped on the chuck 12, the other end of the fatigue test bar is propped against by the thimble 13, then a fastening bolt 16 on the adjusting guide seat 15 is locked, the position of the thimble 13 is fixed, and the low-speed motor 14 drives the chuck 12, the fatigue test bar 11 and the thimble 13 to rotate together;
the supporting component comprises a pair of transverse supporting plates 19, a pair of axial supporting plates 20 and a bottom plate 25, the transverse supporting plates 19 are parallel to each other, fixed on the bottom plate 25 and vertical to the axial guide rail 2 of the axial moving component, and two ends of the axial guide rail 2 are respectively fixed on the inner wall of the transverse supporting plates 19;
the axial supporting plates 20 are parallel to each other, fixed on the bottom plate 25 and vertical to the transverse supporting plate 19, the outer sides of the axial supporting plates 20 are provided with inserting grooves 22, and the outer walls of the inserting grooves 22 are provided with positioning bolts 23;
the polishing assembly comprises a gantry support, a polishing head 18 and a pre-tightening spring 24, the gantry support consists of a cross beam 17 and two stand columns 21, the cross beam 17 stretches across the clamping assembly and the supporting assembly, and the polishing head 18 is connected to the cross beam 17 through the pre-tightening spring 24 and is opposite to the middle gauge length section of the fatigue test bar below;
two upright posts 21 of the gantry support are respectively inserted into the insertion grooves 22 on the outer sides of the axial supporting plates 20 of the supporting components, and the height of the gantry support can be adjusted by moving up and down;
the height of the gantry support is adjusted until the polishing head 18 is propped against the surface of the middle gauge length section of the fatigue test bar by the pre-tightening spring 24, the positioning bolt 23 on the outer wall of the insertion groove 22 at the outer side of the axial supporting plate 20 of the supporting assembly is locked, the height of the gantry support is fixed, and the polishing head 18 carries out axial polishing treatment on the surface of the middle gauge length section of the fatigue test bar 11 on the clamping assembly.
The using method of the fatigue test bar axial polishing device comprises the following steps:
(1) clamping one end of a fatigue test bar 11 on a chuck 12;
(2) moving the movable clamping plate 9 along the adjusting guide rail 10 until the thimble 13 abuts against the other end of the fatigue test bar 11, and screwing the fastening bolt 16 to fix the position of the movable clamping plate 9;
(3) downwards moving the gantry support until the polishing head 18 is pressed on the surface of the middle gauge length section of the fatigue test bar 11 by a pre-tightening spring 24, and screwing a positioning bolt 23 to fix the height of the gantry support;
(4) starting the high-speed motor 4 to enable the fatigue test bar 11 to perform axial high-speed reciprocating linear motion;
(5) starting the low-speed motor 14 to enable the fatigue test bar 11 to perform circumferential low-speed rotation motion;
(6) and (3) after polishing is finished, stopping the high-speed motor 4 and the low-speed motor 14 in sequence, loosening the positioning bolt 23, moving the gantry support upwards, loosening the fastening bolt 16, moving the movable clamping plate 9 backwards, separating the thimble 13 from the fatigue test bar 11, taking down the fatigue test bar 11, checking the roughness and the residual stress of the surface of the fatigue test bar 11, finishing polishing if the requirements are met, and repeating the steps (1) to (5) if the requirements are not met until the requirements are met.
In the embodiment, the fatigue test bar 11 is a cylinder, the tolerance of the cylindricity in the full length range of the cylinder is not more than 0.008mm, the roughness of the surface of the cylinder is Ra1.2 μm before polishing, and the roughness of the surface of the cylinder is Ra0.15 μm after polishing;
the rotating speed of the high-speed motor 4 is 650 r/min;
the rotating speed of the low-speed motor 14 is 2 r/min;
the coaxiality of the whole body formed by the low-speed motor 14, the chuck 12, the fatigue test bar 11 and the thimble 13 in the axial direction is better than 0.003 mm/mm.
The fatigue test bar axial polishing device utilizes the crank-slider mechanism to convert the continuous rotation of the high-speed motor into the axial high-speed reciprocating motion of the fatigue test bar, so as to realize the axial polishing of the fatigue test bar; meanwhile, a low-speed motor is adopted to drive the fatigue test bar to slowly rotate between the chuck and the thimble, so that the circumferential position of the fatigue test bar is adjusted, and the polishing head is used for polishing the surface of the whole fatigue test bar; the device size is small and exquisite, simple structure, and convenient operation uses maintenance low cost, and polishing efficiency is high, to quick, effectively realize the axial polishing of tired test bar and handle very high practical value.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.
Claims (1)
1. The using method of the fatigue test bar axial polishing device is characterized in that the fatigue test bar axial polishing device comprises a supporting component, an axial moving component, a clamping component and a polishing component, wherein the axial moving component and the polishing component are arranged on the supporting component;
the axial movement component comprises a supporting plate, an axial guide rail and an axial movement driving mechanism, the axial guide rail and the axial movement driving mechanism are arranged on the supporting component, the supporting plate is arranged on the axial guide rail and can move along the axial guide rail, the axial movement driving mechanism is connected with the supporting plate, the axial movement driving mechanism drives the supporting plate to move, the clamping component is arranged on the supporting plate, the axial movement driving mechanism comprises a high-speed motor, a crank, a connecting rod and a sliding block, the high-speed motor is fixed on the supporting component, a power output shaft of the high-speed motor is fixedly connected with the crank, the power output shaft of the high-speed motor is perpendicular to the axial guide rail, the crank is driven by the high-speed motor to rotate, the tail end of the crank is rotatably connected with the connecting rod, the connecting rod drives the connecting rod to reciprocate;
two ends of the axial guide rail are respectively fixed on the supporting assembly, each axial guide rail is respectively provided with a guide block, the shape of each guide block is matched with that of the axial guide rail, and each guide block is fixed on the bottom surface of the supporting plate, so that the supporting plate can move along the axial guide rail through the guide block;
the clamping assembly comprises a fixed clamping plate, a movable clamping plate and an adjusting guide rail, the fixed clamping plate and the adjusting guide rail are fixedly arranged on the top surface of the supporting plate, the movable clamping plate is arranged on the adjusting guide rail and can move along the adjusting guide rail, the adjusting guide rail is parallel to the axial guide rail of the axial moving assembly, and the fatigue test bar is arranged between the fixed clamping plate and the movable clamping plate;
the fixed splint is provided with a low-speed motor and a chuck, and a power output shaft of the low-speed motor is connected with the chuck;
the ejector pin is arranged on one side, facing the chuck, of the movable clamping plate, the adjusting guide seat is arranged at the bottom of the movable clamping plate, the adjusting guide seat is matched with the adjusting guide rail in shape, the movable clamping plate moves along the adjusting guide rail through the adjusting guide seat, and the adjusting guide seat is internally provided with a fastening bolt which can fix the adjusting guide seat on the adjusting guide rail;
one end of the fatigue test bar is clamped on the chuck, the other end of the fatigue test bar is propped against by the thimble, after the tightening bolt on the adjusting guide seat is locked, the position of the thimble is fixed, and the chuck, the fatigue test bar and the thimble are driven to rotate together by the low-speed motor;
the polishing assembly comprises a gantry support, a polishing head and a pre-tightening spring, the gantry support consists of a cross beam and two stand columns, the cross beam stretches across the clamping assembly and the supporting assembly, and the polishing head is connected to the cross beam through the pre-tightening spring and is opposite to the middle gauge length position of the fatigue test rod below;
two upright posts of the gantry support are respectively inserted into the supporting assemblies and can move up and down to adjust the height of the gantry support;
the supporting component comprises a pair of transverse supporting plates, a pair of axial supporting plates and a bottom plate, the transverse supporting plates are parallel to each other, fixed on the bottom plate and perpendicular to the axial guide rail of the axial moving component, and two ends of the axial guide rail are respectively fixed on the inner walls of the transverse supporting plates;
the axial supporting plates are parallel to each other, fixed on the bottom plate and vertical to the transverse supporting plates, the outer sides of the axial supporting plates are provided with inserting grooves, the inserting grooves are matched with the upright posts of the gantry support, and the outer walls of the inserting grooves are provided with positioning bolts;
the using method comprises the following steps:
(1) clamping one end of the fatigue test rod on the chuck, wherein the fatigue test rod is a cylinder, the cylindricity tolerance in the full length range of the cylinder is not more than 0.01mm, and the surface roughness of the cylindrical surface of the cylinder is not more than Ra1.6 mu m before polishing;
(2) moving the movable clamping plate along the adjusting guide rail until the thimble props against the other end of the fatigue test bar, and screwing the fastening bolt to fix the position of the movable clamping plate;
(3) downwards moving the gantry support until the polishing head is pressed on the surface of the middle gauge length section of the fatigue test bar by the pre-tightening spring, and screwing the positioning bolt to fix the height of the gantry support;
(4) starting the high-speed motor to enable the fatigue test bar to perform axial high-speed reciprocating linear motion, wherein the rotating speed of the high-speed motor is not lower than 600 r/min;
(5) starting the low-speed motor to enable the fatigue test bar to perform circumferential low-speed rotary motion, wherein the rotating speed of the low-speed motor is not higher than 5 r/min;
wherein the coaxiality of the whole body formed by the low-speed motor, the chuck, the fatigue test bar and the thimble in the axial direction is better than 0.005 mm/mm;
(6) after polishing is finished, stopping the high-speed motor and the low-speed motor in sequence, loosening the positioning bolt, moving the gantry support upwards, loosening the fastening bolt, moving the movable clamping plate backwards to separate the ejector pin from the fatigue test bar, taking down the fatigue test bar, checking the roughness and residual stress of the surface of the fatigue test bar, finishing polishing if the requirements are met, and repeating the steps (1) to (5) if the requirements are not met until the requirements are met;
the fatigue test bar axial polishing device utilizes the crank-slider mechanism to convert the continuous rotation of the high-speed motor into the axial high-speed reciprocating motion of the fatigue test bar, so as to realize the axial polishing of the fatigue test bar; meanwhile, a low-speed motor is adopted to drive the fatigue test bar to slowly rotate between the chuck and the thimble, so that the circumferential position of the fatigue test bar is adjusted, and the polishing head is used for polishing the surface of the whole fatigue test bar.
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| CN201910585637.4A CN110303414B (en) | 2019-07-01 | 2019-07-01 | Axial polishing device for fatigue test bar and using method thereof |
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| CN201910585637.4A CN110303414B (en) | 2019-07-01 | 2019-07-01 | Axial polishing device for fatigue test bar and using method thereof |
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| CN110303414A CN110303414A (en) | 2019-10-08 |
| CN110303414B true CN110303414B (en) | 2021-06-29 |
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| CN111775028A (en) * | 2020-06-24 | 2020-10-16 | 武汉钢铁有限公司 | Polishing device and polishing method for fatigue test sample of metal sheet |
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