An on-line roll wear testing machine and testing method

Abstract

The present invention discloses an on-line roll wear testing machine and a testing method. The on-line roll wear testing machine includes a movable gantry frame. Clamping devices for clamping rolls are arranged on both sides of the gantry frame. A lifting crossbeam is arranged on the gantry frame above the roll. A cross slide module is fixedly arranged below the lifting crossbeam. A T-shaped plate is installed in the tangential moving direction of the cross slide module. A first ball screw linear module and a second ball screw linear module are respectively installed on both sides of the T-shaped plate. A friction and wear test unit is installed on the first ball screw linear module. A wear scar in-situ measuring instrument is installed on the second ball screw linear module. The present invention can directly conduct tests on the effective service parts of large cylindrical workpieces such as rolls, conduct friction and wear experiments on any area of the roll body of the roll, and obtain the comprehensive and accurate wear resistance performance of the roll.

Description

Technical Field

[0001] The present invention relates to the field of material testing, and particularly to an on-line roll wear testing machine and a testing method. Background Art

[0002] The wear resistance and roughness retention ability of rolls are very important indicators for evaluating their excellent service performance. Usually, for cast rolls, after their final heat treatment, a ring is taken from the roll shoulder and processed into a standard wear specimen, and then a friction and wear test is carried out on a testing machine. For forged rolls, after quenching and tempering treatment, a test piece is cut from the roll neck and rough machined, and then the test piece is heat treated by simulating the final heat treatment process of the forged roll, and then finely machined into a standard wear specimen and then a friction and wear test is carried out. There are the following problems:

[0003] First, the solidification and cooling rate during pouring and the heating temperature and cooling rate during heat treatment of the shoulder of the cast roll body are quite different from those of other parts of the roll body. This results in obvious differences in the microstructure between the shoulder and other parts of the roll body, and further leads to differences in their friction and wear behaviors. Since other parts of the roll body cannot be sampled and detected, there will be great uncertainty in using the wear resistance of the shoulder to characterize the wear resistance of the entire roll body.

[0004] Second, the final heat treatment of forged rolls usually adopts induction heating quenching, which has a short time and fine grains. However, the simulated heat treatment of the small specimens used for wear cannot accurately imitate the austenitizing temperature, austenitizing time, cooling rate and cold treatment temperature during induction heating, and its microstructure is quite different from that of the roll body. Moreover, cold rolls are usually evaluated for their roughness retention ability, that is, the ability to maintain the surface grinding surface topography during the rolling process. The processing of small specimens needs to be consistent with the original roughness of the roll body, and the processing ability requirements are very strict. It is necessary to achieve the same surface roughness and prevent surface grinding burns, tempering and cracks during processing.

[0005] In summary, there is an urgent need to develop an on-line friction and wear testing machine to conduct friction and wear experiments on any area of the roll body of the roll to obtain a comprehensive and accurate wear resistance performance of the roll. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an on-line roll wear testing machine and a testing method, which can directly conduct tests on the effective service parts of large cylindrical workpieces such as rolls, conduct friction and wear experiments on any area of the roll body of the roll, obtain a comprehensive and accurate wear resistance performance of the roll, and avoid the phenomenon that the microstructure of the small specimens prepared is significantly different from it, resulting in inconsistent friction and wear performance with the actual situation.

[0007] To solve the above technical problems, the technical solution adopted by the present invention is as follows: An on-line roll wear testing machine, which includes a movable gantry frame. Clamping devices for clamping rolls are arranged on both sides of the gantry frame. A lifting cross beam is arranged on the gantry frame above the roll. A cross slide module is fixedly arranged below the lifting cross beam. A T-shaped plate is installed in the tangential movement direction of the cross slide module. A first ball screw linear module and a second ball screw linear module are respectively installed on both sides of the T-shaped plate. A friction and wear test unit is installed on the first ball screw linear module, and a wear scar in-situ measuring instrument is installed on the second ball screw linear module.

[0008] A further improvement of the technical solution of the present invention lies in that: the gantry frame includes four optical axes, a top plate fixedly arranged above the four optical axes, and universal wheels arranged below the four optical axes.

[0009] A further improvement of the technical solution of the present invention lies in that: the lifting cross beam includes a cross beam slidably sleeved on the four optical axes, a rack fixedly connected above the cross beam, and a reduction motor meshing with the rack. A first flange-shaped linear bearing is installed around the cross beam and the first flange-shaped linear bearing penetrates into the optical axis. The reduction motor is fixedly arranged above the top plate.

[0010] A further improvement of the technical solution of the present invention lies in that: the clamping device includes side plates slidably sleeved on two optical axes on the same side. A first through hole and a second through hole are respectively arranged in the vertical direction and the horizontal direction of the side plate. A second flange-type linear bearing is installed in the first through hole and the second flange-shaped linear bearing penetrates into the optical axis. An electro-hydraulic push rod is installed in the second through hole and the electro-hydraulic push rod abuts against the side of the roll.

[0011] A further improvement of the technical solution of the present invention lies in that: the friction and wear test unit includes a light bar guide sleeve fixedly connected to the first ball screw linear module. Two third through holes are arranged in the light bar guide sleeve and first linear bearings are arranged in the third through holes. The light bar passes through both of the first linear bearings. A light bar upper baffle is fixedly arranged above the two light bars, and a light bar lower baffle is fixedly arranged below the two light bars. A loading spring is sleeved on the light bar between the light bar guide sleeve and the light bar lower baffle. A linear motor support is fixedly connected below the light bar lower baffle. The bottom of the linear motor support is connected to the stator part of the linear motor. The moving part of the linear motor is connected to a force sensor connecting body. A force sensor is fixedly connected below the force sensor connecting body. The lower part of the force sensor is connected to a grinding head fixture connecting body. The grinding head fixture connecting body is fixedly connected to a grinding head fixture. A grinding head is installed in the grinding head fixture.

[0012] A further improvement of the technical solution of the present invention lies in that: the wear scar in-situ measuring instrument adopts any one of a white light interferometer, a laser confocal microscope, a Raman spectrometer, and a metallurgical microscope.

[0013] A further improvement of the technical solution of the present invention lies in: a test method for an on-line roll wear testing machine, comprising the following steps:

[0014] Step S1: Slide the gantry frame above the roll and then fix it;

[0015] Step S2: Drive the lead screw nut seat of the first ball screw linear module according to the diameter of the roll so that the optical rod bushing reaches the highest position;

[0016] Step S3: Drive the lifting crossbeam and adjust the cross slide table module so that the grinding head is at the test position directly above the roll, and the grinding head is slightly disengaged from the roll;

[0017] Step S4: After clearing the test force to zero, drive the first ball screw linear module to lower the optical rod bushing, compress the loading spring to apply the test force to the grinding head and the roll, and the force sensor synchronously measures the magnitude of the force value. After reaching the set force value, stop loading;

[0018] Step S5: Start the linear motor, and the moving part of the linear motor performs reciprocating motions with different frequencies, amplitudes, and cycles according to the set program, and the force sensor synchronously measures the test force and the frictional force;

[0019] Step S6: After reaching the set number of times, raise the lead screw nut seat of the first ball screw linear module to disengage the grinding head from the roll;

[0020] Step S7: Adjust the lifting crossbeam, the cross slide table module, and the second ball screw linear module to move the in-situ measurement instrument for the grinding mark to above the grinding mark to realize the in-situ measurement of the grinding mark morphology, frictional phase, etc.

[0021] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is:

[0022] 1. The present invention adopts a mobile gantry frame. Clamping devices with adjustable heights are installed on the two vertical frames of the gantry frame for fixing the roll. The gantry frame is provided with a lifting crossbeam, a cross slide table module is installed on the lifting crossbeam, a T-shaped plate is installed on the cross slide table module, and the first ball screw linear module and the second ball screw linear module are installed on both sides of the T-shaped plate to respectively fix the friction and wear test unit and the in-situ measurement instrument for the grinding mark. The test force and the frictional force are obtained by the friction and wear test unit performing reciprocating motions with different frequencies, amplitudes, and cycles according to the set program, and then the in-situ measurement instrument for the grinding mark is aligned with the grinding mark to measure the post-grinding morphology, composition, and phase;

[0023] 2. The present invention can directly conduct tests on the effective service parts of large cylindrical workpieces such as rolls. Friction and wear experiments are carried out in any area of the roll body of the roll, so as to obtain the comprehensive and accurate wear resistance performance of the roll, and avoid the phenomenon that the structure of the small sample prepared is significantly different from it, resulting in the friction and wear performance not conforming to the actual situation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 is a schematic diagram of the gantry frame structure of the present invention;

[0026] Figure 3 is a schematic diagram of the crossbeam structure of the present invention;

[0027] Figure 4 is a schematic diagram of the connection between the first ball screw linear module and the friction and wear test unit of the present invention;

[0028] Figure 5 is a front view of the friction and wear test unit of the present invention;

[0029] Figure 6 is a side view of the friction and wear test unit of the present invention;

[0030] Among them, 1. Roll, 2. T-shaped plate, 3. First ball screw linear module, 4. Second ball screw linear module, 5. Friction and wear test unit, 5-1. Optical rod bushing, 5-2. First linear bearing, 5-3. Optical rod, 5-4. Upper baffle of optical rod, 5-5. Lower baffle of optical rod, 5-6. Loading spring, 5-7. Linear motor support, 5-8. Linear motor, 5-9. Force sensor connecting body, 5-10. Force sensor, 5-11. Grinding head fixture connecting body, 5-12. Grinding head fixture, 5-13. Grinding head, 6. In-situ measuring instrument for grinding marks, 7. Optical axis, 8. Top plate, 9. Universal wheel, 10. Crossbeam, 11. Rack, 12. Reduction motor, 13. Side plate, 14. Electro-hydraulic push rod, 15. Cross slide table module. DETAILED DESCRIPTION OF THE INVENTION

[0031] The present invention will be further described in detail below with reference to the embodiments:

[0032] As Figures 1 to 3 shown, an on-line roll wear testing machine includes a movable gantry frame, and the gantry frame includes four optical axes 7, a top plate 8 fixedly arranged above the four optical axes 7, and universal wheels 9 arranged below the four optical axes 7.

[0033] On both sides of the gantry frame, there are clamping devices for clamping the rolling mill roll 1. The clamping devices include side plates 13 slidably sleeved on two optical axes 7 on the same side. The side plates 13 are provided with a first through hole and a second through hole in the vertical and horizontal directions respectively. A second flange type linear bearing is installed in the first through hole and the second flange type linear bearing penetrates into the optical axis 7. An electro-hydraulic push rod 14 is installed in the second through hole and the electro-hydraulic push rod 14 abuts against the side of the roll 1.

[0034] Above the roll 1 on the gantry frame, there is a lifting cross beam. The lifting cross beam includes a cross beam 10 slidably sleeved on four optical axes 7, a rack 11 fixedly connected above the cross beam 10, and a reduction motor 12 meshing with the rack 11. A first flange type linear bearing is installed around the cross beam 10 and the first flange type linear bearing penetrates into the optical axis 7. The reduction motor 12 is fixedly arranged above the top plate 8.

[0035] A cross slide table module is fixedly arranged below the lifting cross beam. A T-shaped plate 2 is installed in the tangential movement direction of the cross slide table module 15. A first ball screw linear module 3 and a second ball screw linear module 4 are respectively installed on both sides of the T-shaped plate 2. A friction and wear test unit 5 is installed on the first ball screw linear module 3. A wear scar in-situ measuring instrument 6 is installed on the second ball screw linear module 4. The wear scar in-situ measuring instrument 6 adopts any one of a white light interferometer, a laser confocal microscope, a Raman spectrometer, and a metallurgical microscope.

[0036] As Figures 4 - 6 shown, the friction and wear test unit 5 includes a light bar guide sleeve 5-1 fixedly connected to the first ball screw linear module 3. Two third through holes are arranged in the light bar guide sleeve 5-1 and a first linear bearing 5-2 is arranged in the third through hole. Two light bars 5-3 penetrate through both of the first linear bearings 5-2. A light bar upper baffle 5-4 is fixedly arranged above the two light bars 5-3 and a light bar lower baffle 5-5 is fixedly arranged below. A loading spring 5-6 is sleeved on the light bar 5-3 between the light bar guide sleeve 5-1 and the light bar lower baffle 5-5. A linear motor support 5-7 is fixedly connected below the light bar lower baffle 5-5. The bottom of the linear motor support 5-7 is connected to the stator part of a linear motor 5-8. The mover part of the linear motor 5-8 is connected to a force sensor connecting body 5-9. A force sensor 5-10 is fixedly connected below the force sensor connecting body 5-9. The lower part of the force sensor 5-10 is connected to a grinding head fixture connecting body 5-11. The grinding head fixture connecting body 5-11 is fixedly connected to a grinding head fixture 5-12. A grinding head 5-13 is installed in the grinding head fixture 5-12.

[0037] A test method for an on-line wear testing machine for rolling mill rolls includes the following steps:

[0038] Step S1: Slide the gantry frame above the roll 1 and then fix it;

[0039] Step S2: Drive the lead screw nut seat of the first ball screw linear module 3 according to the diameter of the roll 1 so that the optical rod bushing 5-1 reaches the highest position;

[0040] Step S3: Drive the lifting crossbeam and adjust the cross slide module 15 so that the grinding head 5-13 is at the test position directly above the roll 1, and the grinding head 5-13 is slightly disengaged from the roll 1;

[0041] Step S4: After zeroing the test force, drive the first ball screw linear module 3 to lower the optical rod bushing 5-1, compress the loading spring 5-6 to apply the test force to the grinding head 5-13 and the roll 1, and the force sensor 5-10 synchronously measures the magnitude of the force value. After reaching the set force value, stop loading;

[0042] Step S5: Turn on the linear motor 5-8, and the moving part of the linear motor 5-8 reciprocates at different frequencies, amplitudes, and cycles according to the set program, and the force sensor 5-10 synchronously measures the test force and the frictional force;

[0043] Step S6: After reaching the set number of times, raise the lead screw nut seat of the first ball screw linear module 3 to disengage the grinding head 5-13 from the roll 1;

[0044] Step S7: Adjust the lifting crossbeam, the cross slide module 15, and the second ball screw linear module 4 to move the in-situ measuring instrument 6 for grinding marks above the grinding marks to realize the in-situ measurement of the morphology of the grinding marks, the friction phases, etc.

[0045] The present invention adopts a mobile gantry frame. On the two vertical frames of the gantry frame, a clamping device with adjustable height is installed for fixing the roll 1. The gantry frame is provided with a lifting crossbeam. On the lifting crossbeam, a cross slide module 15 is installed. On the cross slide module 15, a T-shaped plate 2 is installed. On both sides of the T-shaped plate 2, a first ball screw linear module 3 and a second ball screw linear module 4 are installed, which respectively fix the friction and wear test unit 5 and the in-situ measuring instrument 6 for grinding marks. The friction and wear test unit 5 reciprocates at different frequencies, amplitudes, and cycles according to the set program to obtain the test force and the frictional force, and then the in-situ measuring instrument 6 for grinding marks is aligned with the grinding marks to measure the morphology, composition, and phases after grinding. The present invention can directly conduct tests on the effective service parts of large cylindrical workpieces such as rolls, conduct friction and wear experiments on any area of the roll body of the roll, obtain the comprehensive and accurate wear resistance performance of the roll, and avoid the phenomenon that the structure of the small specimen prepared is significantly different from it, resulting in the friction and wear performance not conforming to the actual situation.

Claims

1. An on-line roll wear testing machine, characterized in that: It includes a movable gantry frame, the gantry frame includes four optical axes (7), a top plate (8) fixedly arranged above the four optical axes (7), and universal wheels (9) arranged below the four optical axes (7). Clamping devices for clamping the roll (1) are arranged on both sides of the gantry frame. The clamping device includes side plates (13) slidably sleeved on two optical axes (7) on the same side. The side plates (13) are provided with a first through hole and a second through hole in the vertical and horizontal directions respectively. A second flange type linear bearing is installed in the first through hole and the second flange type linear bearing penetrates into the optical axis (7). An electro-hydraulic push rod (14) is installed in the second through hole and the electro-hydraulic push rod (14) abuts against the side of the roll (1). An elevating cross beam is arranged on the gantry frame above the roll (1). The elevating cross beam includes a cross beam (10) slidably sleeved on the four optical axes (7), a rack (11) fixedly connected above the cross beam (10), and a reduction motor (12) meshing with the rack (11). A first flange type linear bearing is installed around the cross beam (10) and the first flange type linear bearing penetrates into the optical axis (7). The reduction motor (12) is fixedly arranged above the top plate (8). A cross slide table module is fixedly arranged below the elevating cross beam. A T-shaped plate (2) is installed in the tangential moving direction of the cross slide table module (15). A first ball screw linear module (3) and a second ball screw linear module (4) are respectively installed on both sides of the T-shaped plate (2). A friction and wear test unit (5) is installed on the first ball screw linear module (3). The friction and wear test unit (5) includes a light rod guide sleeve (5-1) fixedly connected to the first ball screw linear module (3). Two third through holes are arranged in the light rod guide sleeve (5-1) and a first linear bearing (5-2) is arranged in the third through hole. A light rod (5-3) passes through both of the first linear bearings (5-2). A light rod upper baffle (5-4) is fixedly arranged above the two light rods (5-3), and a light rod lower baffle (5-5) is fixedly arranged below. A loading spring (5-6) is sleeved on the light rod (5-3) between the light rod guide sleeve (5-1) and the light rod lower baffle (5-5). A linear motor support (5-7) is fixedly connected below the light rod lower baffle (5-5). The bottom of the linear motor support (5-7) is connected to the stator part of a linear motor (5-8). The mover part of the linear motor (5-8) is connected to a force sensor connecting body (5-9). A force sensor (5-10) is fixedly connected below the force sensor connecting body (5-9). The lower part of the force sensor (5-10) is connected to a grinding head fixture connecting body (5-11). The grinding head fixture connecting body (5-11) is fixedly connected to a grinding head fixture (5-12). A grinding head (5-13) is installed in the grinding head fixture (5-12). A grinding mark in-situ measuring instrument (6) is installed on the second ball screw linear module (4).

2. An on-line roll wear testing machine according to claim 1, It is characterized in that: The in-situ wear mark measuring instrument (6) adopts any one of a white light interferometer, a laser confocal microscope, a Raman spectrometer, and a metallurgical microscope.

3. A test method for an on-line roll wear testing machine It is characterized in that: An on-line roll wear testing machine as described in any one of claims 1-2 is adopted, and the specific test method includes the following steps: Step S1: Slide the sliding gantry frame above the roll (1) and then fix it; Step S2: Drive the lead screw nut seat of the first ball screw linear module (3) according to the diameter of the roll (1) so that the optical bar bushing (5-1) reaches the highest position; Step S3: Drive the lifting crossbeam and adjust the cross slide module (15) so that the grinding head (5-13) is at the test position directly above the roll (1), and the grinding head (5-13) is slightly disengaged from the roll (1); Step S4: After zeroing the test force, drive the first ball screw linear module (3) to lower the optical bar bushing (5-1), compress the loading spring (5-6) to apply the test force to the grinding head (5-13) and the roll (1), and the force sensor (5-10) synchronously measures the magnitude of the force value. After reaching the set force value, stop loading; Step S5: Turn on the linear motor (5-8), and the moving part of the linear motor (5-8) performs reciprocating motions with different frequencies, amplitudes, and cycles according to the set program, and the force sensor (5-10) synchronously measures the test force and the friction force; Step S6: After reaching the set number of times, raise the lead screw nut seat of the first ball screw linear module (3) to disengage the grinding head (5-13) from the roll (1); Step S7: Adjust the lifting crossbeam, the cross slide module (15), and the second ball screw linear module (4) to move the in-situ wear mark measuring instrument (6) above the wear mark to realize the in-situ measurement of the wear mark morphology and the friction phase.

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