CN110530619B - Drill bit test platform and test method - Google Patents
Drill bit test platform and test method Download PDFInfo
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- CN110530619B CN110530619B CN201910720960.8A CN201910720960A CN110530619B CN 110530619 B CN110530619 B CN 110530619B CN 201910720960 A CN201910720960 A CN 201910720960A CN 110530619 B CN110530619 B CN 110530619B
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- 238000012360 testing method Methods 0.000 title claims abstract description 98
- 238000010998 test method Methods 0.000 title claims abstract description 6
- 238000005553 drilling Methods 0.000 claims abstract description 68
- 230000007246 mechanism Effects 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000009434 installation Methods 0.000 claims abstract 5
- 239000000523 sample Substances 0.000 claims description 77
- 238000013016 damping Methods 0.000 claims description 22
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 230000001939 inductive effect Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 229910000746 Structural steel Inorganic materials 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/58—Investigating machinability by cutting tools; Investigating the cutting ability of tools
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Abstract
The invention discloses a drill bit test platform and a test method, wherein the drill bit test platform comprises an installation framework, a bearing mechanism and a drilling mechanism, wherein the bearing mechanism and the drilling mechanism are installed on the installation framework to integrally form the test platform; the cylinder of the drilling mechanism applies constant pressure to the tested drill bit, and the time for drilling a hole with a certain depth and a certain number of holes is measured as comparison to accurately reflect the sharpness and the wear resistance of the drill bit; the invention has simple structure, stable operation and controllable process index, is suitable for testing drill bits with different thicknesses and lengths, and has good universality.
Description
Technical Field
The invention relates to a drill bit testing method and a test bench, in particular to a method for testing sharpness and wear resistance (service life) of a drill bit and a test bench structure.
Background
As is well known, the sharpness of a drill determines the speed and efficiency of drilling, and as the depth of a drilled hole or the number of drilled holes increases, the cutting edge of the drill is gradually worn, dulled and attenuated, and when the sharpness decreases to a certain extent, the drill fails and has a life. In addition, the wear resistance of the drill bit determines how fast the sharpness of the drill bit decays, and thus the life of the drill bit.
The sharpness and the wear resistance (service life) of the drill bit depend on the material and the manufacturing process of the drill bit, are two important indexes for measuring the performance of the drill bit, and are important quality indexes concerned by manufacturers, users and quality supervision departments. However, at present, no accurate and popular test method and automatic test device exist. The traditional test method depends on manual drilling test, and because of the limitation of test conditions and subjective judgment of testers only by feeling, the result is not accurate, and the procedure is complicated, time-consuming and labor-consuming.
Disclosure of Invention
The invention aims to: the automatic testing platform and the testing method for the drill bit are provided, the sharpness and the wear resistance (service life) of the twist drill bit or the impact drill bit are automatically tested through the platform, the automatic testing of the drill bit is realized, and the automatic testing platform and the testing method have good universality.
The technical solution of the invention is as follows:
the drill bit test platform comprises a mounting framework, a bearing mechanism and a drilling mechanism, wherein the bearing mechanism and the drilling mechanism are mounted on the mounting framework to integrally form the test platform; the mounting framework consists of a wall plate and a bottom plate vertically connected with the wall plate; the bearing mechanism comprises a cross sliding table, an X-axis stepping motor and an X-axis screw rod, the cross sliding table comprises a guide rail and a supporting plate in the X-axis direction and the Y-axis direction respectively, the X-axis stepping motor is connected with the X-axis supporting plate of the cross sliding table through the X-axis screw rod, the Y-axis stepping motor is connected with the Y-axis supporting plate of the cross sliding table through the Y-axis screw rod, a standard test piece is placed on the cross sliding table, and the drilling position of the standard test piece is changed by moving the cross sliding table; the drilling mechanism comprises a damping cylinder, a connecting rod, a linear guide rail, an electric drill, a vernier, a pressure regulating valve, an upper probe and a lower probe, a damping cylinder is fixed on a wall plate, a piston rod of the damping cylinder faces downwards, a piston of the damping cylinder extends out of a gas port, a piston retraction gas port of the piston is connected with the pressure regulating valve of a gas source through a two-position five-way electromagnetic valve, the linear guide rail is fixed on the same axis below the damping cylinder, the piston rod of the damping cylinder is connected with a sliding block on the linear guide rail through the connecting rod, the electric drill is fixed on the sliding block, a tested drill bit is clamped on the electric drill, the vernier is installed on the connecting rod, the vernier, the sliding block, the electric drill and the tested drill bit move up and down along the linear guide rail together with the piston rod, and two inductive proximity switches with adjustable intervals are installed at the upper position and the lower position parallel to the side of the connecting rod, namely the upper probe and the lower probe as position sensors.
Furthermore, a probe bracket is arranged at the side of the connecting rod on the wall plate in parallel, and the probe bracket is in an angle iron shape; one surface of the wall plate is provided with two long holes which are fixed on the wall plate through two bolts and can loosen the two bolts to move up and down; and on the other right-angle surface, a round hole is arranged above the probe, a long hole is arranged below the probe, the round hole and the long hole are respectively used for installing an upper probe and a lower probe, the position of the upper probe is fixed, and the position of the lower probe is adjusted up and down along the probe bracket.
Furthermore, a controller is arranged on the wall plate, and the controller is connected with the electric drill, the two-position five-way electromagnetic valve, the pressure regulating valve, the X-axis stepping motor, the Y-axis stepping motor, the upper probe and the lower probe in a circuit mode to form an electric circuit.
The testing method of the drill bit testing platform comprises the steps of continuously drilling N holes by using a tested drill bit according to a constant electric drill rotating speed, a constant drill bit pressure, a certain drilling depth and a standard test piece, and measuring the time for each hole; under the constant condition, the tested drill bit is made to drill N holes in sequence, and the time t used by each hole is recorded1——tNThen, take the average, t ═ t (t)1＋t2＋…＋tN) The length of the time t for drilling reflects the sharpness of the drill bit, and the shorter the time, the sharper the drill bit; time t for drilling Nth holeNAnd time t for the 1 st well1Is equal to tN－t1Reflecting the wear resistance (life) of the drill bit, it is obvious that the smaller Δ t, the slower the sharpness decay of the drill bit, the better the wear resistance, the longer the life; the tested drill bits with the same specification, different materials and different manufacturing processes (including the screw pitch, the cutting edge angle and the heat treatment of the drill bit) can distinguish the sharpness and the wear resistance (service life) of the two drill bits by comparing t and delta t of the two drill bits, wherein the smaller the t value is, the sharper the t value is, and the smaller the delta t value is, the longer the wear resistance is (the longer the service life is).
The specific process of the testing method of the drill testing platform comprises the following steps: the cylinder is used as a power source, constant pressure is applied to a tested drill bit and a standard test piece, the time spent in drilling each hole of N holes with certain depth is measured as comparison, and the sharpness and the wear resistance of the drill bit are judged, wherein the sharpness and the wear resistance are also life tests; wherein, the sharpness test: a tested drill bit is installed on the electric drill, a standard test piece is placed on the cross sliding table, the electric drill is driven by the damping air cylinder to move up and down along the linear guide rail, the tested drill bit applies certain pressure to the standard test piece, and the tested drill bit drills a hole in the standard test piece; the depth of the tested drill bit into the standard test piece is controlled by the upper probe and the lower probe, after the previous hole is drilled, the drill bit is lifted, the test piece is shifted, the next hole is drilled, the drilling is repeated for N times, the drilling time of each time is recorded, the sharpness of the drill bit is judged by calculating the average time, and the drill bit is sharper when the time is shorter;
among them, wear resistance, that is, life test: the wear resistance (life) of the drill was judged by comparing the difference between the time for drilling at the 1 st time and the time for drilling at the N th time, and it is apparent that the smaller the difference in time, the better the wear resistance (longer life) of the drill.
The principle of the invention is as follows: the cylinder is used as the power for drilling and lifting the drill, and the electric drill is used as the power for rotating the drill bit; when drilling, the piston rod, the connecting rod, the electric drill and the tested drill bit are pushed by air pressure to move downwards, when the drill bit contacts the standard test piece, the vernier is just aligned with the upper probe, and the upper probe outputs a signal to start timing; when the drill reaches a set depth, aligning the cursor with the lower probe, outputting a signal by the lower probe to stop timing, wherein the timing time is the drilling time; after the last hole is drilled, lifting the drill, shifting the test piece, drilling the next hole, repeating the drilling for N times, recording the drilling time of each time, and realizing the control, timing and recording of the whole test process by a measurement and control circuit of the controller; judging the sharpness of the drill bit by testing and calculating the average time for drilling, wherein the shorter the time, the sharper the drill bit; the wear resistance (life) of the drill was judged by comparing the difference between the time for drilling at the 1 st time and the time for drilling at the N th time, and it is apparent that the smaller the difference in time, the better the wear resistance (longer life) of the drill.
Furthermore, the air source pressure during the test of the drill bits with different thicknesses, namely the pressure applied to the drill bit by the piston rod of the air cylinder and the drilling depth are different and are set according to the test specification.
Furthermore, for the test of a certain drill bit, the air source pressure is constant, the drilling depth is constant every time, the power supply rotating speed of the electric drill is stable by the voltage-stabilized power supply, the sharpness of the drill bit is accurately reflected by the time used for drilling, and the wear resistance (service life) of the drill bit is also accurately reflected by the difference of the time used for the 1 st hole and the N th hole.
The invention has the following advantages:
1. the testing method provides an accurate and scientific testing means for drill bit manufacturers to select proper drill bit materials, improve the production process and improve the product quality, and also provides a scientific basis for testing drill bits by technical supervision departments.
2. The pressure applied to the drill bit is constant, the drilling depth is certain, the rotating speed of the electric drill is stable in the test process of the drill bit, the working conditions of all holes are consistent, and the drilling time accurately reflects the sharpness and the wear resistance (service life) of the drill bit.
3. The actions of the electric drill, the air cylinder and the cross sliding table and the measurement and recording of the drilling time are realized by the measurement and control circuit, and the automation of the drill bit test is realized.
4. The pressure of the air source is changed to change the pressure applied to the drill bit by the air cylinder, and the distance between the two probes is changed to change the punching depth, so that the test platform is suitable for testing drill bits with different thicknesses, lengths and types, and has good universality.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a graph for testing a drill bit under test according to the present invention, in which a graph 1 is a time variation graph of each of the 1 st hole to the nth hole, and a graph 2 is a drilling speed variation graph of the 1 st hole to the nth hole.
In the figure: the device comprises a damping cylinder 1, a piston rod 2, a piston extension air port 3, a piston retraction air port 4, a connecting rod 5, a linear guide rail 6, a sliding block 7, an electric drill 8, a tested drill bit 9, a vernier 10, a two-position five-way electromagnetic valve 11, a pressure regulating valve 12, a cross sliding table 21, an X-axis stepping motor 22, an X-axis screw rod 23, a standard test piece 24, a probe bracket 31, an upper probe 32, a lower probe 33, a wall plate 41 and a bottom plate 42.
Detailed Description
The technical solution of the present invention is further explained with reference to the drawings, but it should not be construed as being limited thereto.
As shown in fig. 1, the drill testing platform comprises a mounting framework, a bearing mechanism and a drilling mechanism, wherein the bearing mechanism and the drilling mechanism are mounted on the mounting framework to form the testing platform as a whole; the mounting framework consists of a wall plate 41 and a bottom plate 42 vertically connected with the wall plate; the bearing mechanism comprises a cross sliding table 21, an X-axis stepping motor 22 and an X-axis screw rod 23, the cross sliding table 21 is arranged on a bottom plate 42, the cross sliding table 21 respectively comprises a guide rail and a supporting plate in the X-axis direction and a guide rail in the Y-axis direction, the X-axis stepping motor 22 (model 86BYG 250D) is connected with the X-axis supporting plate of the cross sliding table 21 through the X-axis screw rod 23 (specification M12X 4), an X-axis dragging plate of the cross sliding table 21 is dragged by the X-axis stepping motor 22 to move in the X-axis direction through the X-axis screw rod 23, the Y-axis stepping motor is connected with the Y-axis supporting plate of the cross sliding table 21 through the Y-axis screw rod, the Y-axis dragging plate is also dragged by the screw rod to move in the Y-axis direction (in figure 1, the model and the specification are the same as those of the X-axis), a standard test piece 24 is placed on the cross sliding table 21, the drilling position of the standard test piece 24 is changed by moving the cross sliding table 21 in the X, Y-axis direction, the test twist drill uses carbon steel as a test piece, and the test impact drill uses concrete as a test piece; the drilling mechanism comprises a damping cylinder 1, a connecting rod 5, a linear guide rail 6, an electric drill 8, a vernier 10, a pressure regulating valve 12, an upper probe 32 and a lower probe 33, the damping cylinder 1 (model SC50 multiplied by 250) is fixed on a wall plate 41, the piston rod 2 of the damping cylinder is downward, the damping cylinder 1 is connected with a pressure regulating valve 12 of an air source through a two-position five-way electromagnetic valve 11 (model 4V 210-08A), a linear guide rail 6 (model HGR30 multiplied by 300) is fixed on the same axis below the damping cylinder 1, the piston rod 2 with the damping cylinder 1 is connected with a slider 7 (model HGH30 CA) on the linear guide rail 6 through a connecting rod 5, an electric drill 8 is fixed on the slider 7, a tested drill bit 9 is clamped on the electric drill 8, a vernier 10 is installed on the connecting rod 5, two inductive proximity switches (inductive NPN type proximity switches, model LJ12A 3-4-Z/BX) with adjustable distance are arranged at the upper and lower parallel positions on the side of the connecting rod 5 and serve as position sensors, namely an upper probe 32 and a lower probe 33; a piston extension air port 3 and a piston retraction air port 4 of the damping cylinder 1 are respectively connected with an A, B air port of a two-position five-way electromagnetic valve 11 (model 4V 210-08A) through a conduit, and the two-position five-way electromagnetic valve 11 is connected with a pressure regulating valve 12 of an air source; when the coil of the two-position five-way electromagnetic valve 11 is electrified, the port A is communicated with the port P of the air source, the port B is communicated with the port S and is emptied, and the piston rod 2 drives the connecting rod 5, the vernier 10, the electric drill 8 and the tested drill bit 9 to move downwards to drill holes under air pressure; on the contrary, when the coil of the two-position five-way electromagnetic valve 11 is powered off, the port B is communicated with the port P of the air source, the port A is communicated with the port R and is emptied, and the piston rod 2 drives the connecting rod 5, the vernier 10, the electric drill 8 and the tested drill bit 9 to move upwards to lift the drill under the air pressure.
Furthermore, a probe bracket 31 is arranged on the wall plate 41 at the side parallel position of the connecting rod 5, and the probe bracket 31 is in an angle iron shape; one surface of the plate is provided with two long holes which are fixed on the wall plate 41 through two bolts and can be loosened to move up and down; on the other right-angle surface, a round hole is arranged above the probe, a long hole is arranged below the probe, the round hole and the long hole are respectively used for installing an upper probe 32 and a lower probe 33, the position of the upper probe 32 is fixed, and the position of the lower probe 33 is adjusted up and down along the probe bracket 31.
Furthermore, a controller is arranged on the wall plate 41, and the controller is connected with the electric drill 8, the two-position five-way electromagnetic valve 11, the pressure regulating valve 12, the X-axis stepping motor 22, the Y-axis stepping motor, the upper probe 32 and the lower probe 33 in a circuit mode to form an electric circuit.
The testing method of the drill bit testing platform comprises a sharpness testing and a wear resistance testing, namely a service life testing; wherein, the sharpness test: a tested drill bit 9 is installed on the electric drill 8, a standard test piece 24 is placed on the cross sliding table 21, the electric drill 8 is driven by the damping cylinder 1 to move up and down along the linear guide rail 6, the tested drill bit 9 applies certain pressure to the standard test piece 24, and the tested drill bit 9 drills a hole in the standard test piece 24; the depth of the hole drilled into the standard test piece 24 by the tested drill bit 9 is controlled by the upper probe 32 and the lower probe 33, after the previous hole is drilled, the drill is lifted, the test piece is shifted, the next hole is drilled, the drilling is repeated for N times, and the drilling time of each time is recorded; judging the sharpness of the drill bit by calculating the average value of the time spent in each hole, wherein the shorter the time, the sharper the drill bit; among them, wear resistance, that is, life test: the wear resistance (life) of the drill was judged by comparing the difference between the time for drilling at the 1 st time and the time for drilling at the N th time, and it is apparent that the smaller the difference in time, the better the wear resistance (longer life) of the drill.
Before the drill bit is tested, the tested drill bit is installed, the electric drill 8 is manually moved downwards until the tested drill bit 9 contacts the standard test piece 24, two fixing bolts of the probe bracket 31 are loosened, the probe bracket 31 is moved up and down, the sensing end of the upper probe 32 is aligned with the vernier 10, and then the two bolts are screwed to fix the probe bracket; adjusting the position of the lower probe 33 up and down to make the distance between the lower probe and the upper probe 32 equal to the drilling depth; meanwhile, the positions of the upper probe and the lower probe are adjusted in the horizontal direction, so that the distance between the sensing end of the upper probe and the vernier is 3-4 mm.
When the drill bit is tested, firstly, an air source is connected, and the piston rod 2 drives the connecting rod 5, the vernier 10 and the electric drill 8 to move upwards to the highest point; then electrifying the electric drill 8 and the coil of the two-position five-way electromagnetic valve 11, starting to rotate the drill bit, driving the connecting rod 5, the vernier 10 and the electric drill 8 to move downwards by the piston rod 2, and starting to time when the vernier 10 passes through the position of the upper probe 32 (namely when the tested drill bit 9 contacts the standard test piece 24 and starts to drill a hole); stopping timing when the cursor 10 passes the position of the lower probe 33 (namely reaching the drilling depth), wherein the measured time is the time for drilling the 1 st hole; then the coil of the two-position five-way electromagnetic valve 11 is powered off, and the piston rod 2 drives the connecting rod 5, the vernier 10 and the electric drill 8 to move upwards to the highest point; then, the stepping motor of the cross sliding table 21 acts to drive the cross sliding table to move a hole position; electrifying the coil of the two-position five-way electromagnetic valve 11 again, moving the electric drill 8 downwards, drilling a 2 nd hole and timing; repeating the test for N times, and controlling, timing and recording the whole drill bit test process by a measurement and control circuit of the controller.
The output pressure of the pressure regulating valve 12 is regulated, and the pressure applied to the tested drill bit 9 by the air cylinder 1 is changed so as to adapt to the tested drill bits with different thicknesses and types; the distance between the upper probe 32 and the lower probe 33 is adjusted to change the drilling depth so as to adapt to the tested drill bits with different lengths.
The air source pressure (namely the pressure applied by the piston rod 2 to the tested drill bit 9) and the drilling depth of the drill bits with different thicknesses are different during testing and are set according to the test specification; for the test specification of a certain drill bit, the air source pressure is constant, the drilling depth is constant every time, and the power supply rotation speed of the electric drill is stable by the stabilized power supply, so the sharpness of the drill bit is accurately reflected by the time for drilling, and the wear resistance (service life) of the drill bit is also accurately reflected by the difference of the time for the 1 st hole and the N th hole.
Claims (1)
1. The test method of the drill test platform comprises the steps that the drill test platform comprises an installation framework, a bearing mechanism and a drilling mechanism, wherein the bearing mechanism and the drilling mechanism are installed on the installation framework to integrally form the test platform; the mounting framework consists of a wall plate (41) and a bottom plate (42) vertically connected with the wall plate; the bearing mechanism comprises a cross sliding table (21), an X-axis stepping motor (22) and an X-axis screw rod (23), the cross sliding table (21) comprises guide rails and supporting plates in the X-axis direction and the Y-axis direction respectively, the X-axis stepping motor (22) is connected with the X-axis supporting plate of the cross sliding table (21) through the X-axis screw rod (23), the Y-axis stepping motor is connected with the Y-axis supporting plate of the cross sliding table (21) through the Y-axis screw rod, a standard test piece (24) is placed on the cross sliding table (21), and the drilling position of the standard test piece (24) is changed by moving the cross sliding table; the drilling mechanism comprisesTake damping cylinder (1), connecting rod (5), linear guide (6), electric drill (8), vernier (10), pressure-regulating valve (12), go up probe (32) and lower probe (33), fixed band damping cylinder (1) on wallboard (41), its piston rod (2) is downward, piston that takes damping cylinder (1) stretches out gas port (3), pressure-regulating valve (12) of air supply is connected through two-position five-way solenoid valve (11) in piston withdrawal gas port (4), fixed linear guide (6) on the below same axis of taking damping cylinder (1), piston rod (2) that takes damping cylinder (1) are connected with slider (7) on linear guide (6) through connecting rod (5), fixed electric drill (8) on slider (7), it is tried drill (9) to clamp on electric drill (8), installation (10) on connecting rod vernier (5), connecting rod (5), vernier (10), The sliding block (7), the electric drill (8) and the tested drill bit (9) move up and down along the linear guide rail (6) along with the piston rod (2), and two inductive proximity switches with adjustable intervals are arranged at the parallel upper and lower positions on the side of the connecting rod (5) and serve as position sensors, namely an upper probe (32) and a lower probe (33); a probe bracket (31) is arranged on the wall plate (41) at the side parallel position of the connecting rod (5), and the probe bracket (31) is in an angle iron shape; one surface is provided with two long holes which are fixed on the wall plate (41) through two bolts and can be loosened to move up and down; on the other right-angle surface, a round hole is arranged above the right-angle surface, a long hole is arranged below the right-angle surface and is used for installing an upper probe (32) and a lower probe (33) respectively, the position of the upper probe (32) is fixed, and the position of the lower probe (33) can be adjusted up and down along a probe bracket (31); the position of the lower probe (33) is adjusted up and down to ensure that the distance between the lower probe and the upper probe (32) is equal to the depth of the drilled hole; meanwhile, the positions of the upper probe and the lower probe are adjusted in the horizontal direction, so that the distance between the sensing end of the upper probe and the vernier (10) is 3-4 mm; a controller is arranged on the wall plate (41), and the controller is connected with the electric drill (8), the two-position five-way electromagnetic valve (11), the pressure regulating valve (12), the X-axis stepping motor (22), the Y-axis stepping motor, the upper probe (32) and the lower probe (33) in a circuit mode to form an electric circuit; the testing method comprises the steps of using an air cylinder as a power source, applying constant pressure to a tested drill bit, measuring the time for drilling a 1 st hole and an Nth hole with certain depths as comparison, and judgingThe sharpness and wear resistance of the drill bit, including sharpness test and wear resistance, i.e. life test; the method comprises the steps of continuously drilling N holes by using a tested drill bit at a constant electric drill rotating speed, a constant drill bit pressure, a certain drilling depth and a standard test piece, and measuring the time for each hole; under the constant condition, the tested drill bit is made to drill N holes in sequence, and the time t used by each hole is recorded1——tNThen, take the average, t ═ t (t)1＋t2＋…＋tN) The length of the time t for drilling reflects the sharpness of the drill bit, and the shorter the time, the sharper the drill bit; time t for drilling Nth holeNAnd time t for the 1 st well1Is equal to tN－t1Reflecting the wear resistance of the drill bit, obviously, the smaller the Delta t is, the slower the sharpness attenuation of the drill bit is, the better the wear resistance is and the longer the service life is;
the method is characterized in that:
wherein, the sharpness test: a tested drill bit (9) is installed on the electric drill (8), a standard test piece (24) is placed on the cross sliding table (21), the electric drill (8) is driven by the damping cylinder (1) to move up and down along the linear guide rail (6), the tested drill bit (9) applies certain pressure to the standard test piece (24), and the tested drill bit (9) drills a hole on the standard test piece (24); the depth of the tested drill bit (9) drilled into the hole of the standard test piece (24) is controlled by an upper probe (32) and a lower probe (33); after the last hole is drilled, lifting the drill, shifting the test piece, drilling the next hole, and repeating the drilling for N times; recording the drilling time of each time, and judging the sharpness of the drill bit by calculating the average time for drilling, wherein the shorter the time is, the sharper the drill bit is;
among them, wear resistance, that is, life test: judging the wear resistance of the drill bit by comparing the difference between the time for drilling the 1 st time and the time for drilling the Nth time, wherein obviously, the smaller the difference in time is, the better the wear resistance of the drill bit is;
the tested drill bits with the same specification, different materials and different manufacturing processes can distinguish the sharpness and the wear resistance of the two drill bits by comparing t and delta t of the two drill bits, wherein the smaller the t value, the sharper the t value, and the smaller the delta t value, the more wear-resistant the drill bits;
the air source pressure during testing, namely the pressure applied to the drill by the piston rod of the air cylinder and the drilling depth, of the drill with different thicknesses is different and is set according to the test specification;
the electric drill is stable in power supply rotating speed by the stabilized voltage power supply, the sharpness of the drill bit is accurately reflected by the time spent in drilling, and the wear resistance of the drill bit is also accurately reflected by the difference value of the time spent in the 1 st hole and the time spent in the Nth hole.
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| CN114563167A (en) * | 2021-12-03 | 2022-05-31 | 浙江博来工具有限公司 | Electric drill impact endurance test equipment |
| CN116577089B (en) * | 2023-07-14 | 2023-10-20 | 苏州悦来医疗器械有限公司 | Performance detection device and method for medical electric drill |
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