Preparation Device and Preparation Method for Cup-shaped Grinding Wheel with Ordered Arrangement of Abrasive Grains

Abstract

The present invention provides a preparation device and a preparation method for a cup-shaped grinding wheel with orderly arranged abrasive grains, comprising: a frame; a workbench, the position of the workbench on the frame is adjusted by a workbench position adjustment mechanism, and the grinding wheel base is placed on the workbench for processing; an abrasive spreading device for spraying abrasive grains on the grinding wheel base; and a laser sintering device for sintering in real time the abrasive grains scattered on the grinding wheel base. The preparation device and the preparation method for a cup-shaped grinding wheel with orderly arranged abrasive grains according to the present invention realize quantitative negative-pressure suction feeding and positive-pressure spraying of the temporary storage bin through the reciprocating motion of an eccentric driven wheel, and in combination with the workbench position adjustment mechanism, the abrasive grains are arranged in an orderly and regular pattern on the end face of the grinding wheel base. At the same time, the laser sintering device sinters the abrasive grains on the end face of the grinding wheel base, and the arrangement of the abrasive grains is precise and flexible, so as to obtain a cup-shaped grinding wheel with regularly and orderly arranged abrasive grains.

Description

Technical Field

[0001] The present invention relates to the technical field of abrasive tool preparation, and particularly relates to a preparation device and a preparation method for a cup-shaped grinding wheel with orderly arranged abrasive grains. Background Art

[0002] With the rapid development of modern manufacturing industry, the requirements for the processing precision and quality of various materials are getting higher and higher. Although difficult-to-machine materials such as stainless steel and cemented carbide have excellent mechanical properties, their processing performance is poor. Especially during grinding, there are problems such as large grinding force, high grinding temperature, low efficiency, and easy burning and hardening layer generation on the processed surface, resulting in part scrapping and resource waste.

[0003] For traditional grinding wheels with randomly arranged abrasive grains, due to the small holding force of the abrasive grains, the abrasive grains are easy to fall off, resulting in an increase in the surface roughness of the workpiece and a reduction in the service life of the grinding wheel. At the same time, it is not conducive to the discharge of chips and the entry of grinding fluid, and is prone to burning of the workpiece.

[0004] The patent with the publication number CN105058255A discloses a device for preparing a grinding wheel with orderly arranged magnetic abrasive grains. It makes the abrasive grains arranged orderly by the action of a magnetic field. Since it relies on the magnetic field, it is only effective for magnetic metal abrasive grains and the arrangement form is limited.

[0005] The patent with the publication number CN105415216A proposes a method for preparing a diamond grinding wheel with orderly arranged abrasive grains by using 3D printing technology. The arrangement mode of its abrasive grains is not restricted, but it is only a regular arrangement of abrasive grain groups and cannot achieve the orderly arrangement of single abrasive grains or a small number of abrasive grains.

[0006] The patent with the publication number CN204450260U discloses a device for multi-layer orderly arrangement of abrasives. It sucks the abrasive grains through orderly arranged thin straws and implants them into the matrix to achieve the orderly arrangement of the abrasive grains. However, manufacturing a grinding wheel in this way requires specially manufacturing a corresponding group of thin straws, and the aperture of the thin straws is small and difficult to manufacture, so there are many inconveniences in practice. Summary of the Invention

[0007] In order to solve the above problems, the present invention provides a preparation device and a preparation method for a cup-shaped grinding wheel with orderly arranged abrasive grains. Through the reciprocating motion of an eccentric driven wheel, quantitative negative pressure suction and positive pressure spraying of materials in a temporary storage bin are realized, and combined with a workbench position adjustment mechanism, the abrasives are arranged orderly and regularly on the end face of the grinding wheel matrix. At the same time, a laser sintering device sinters the abrasives on the end face of the grinding wheel matrix. The arrangement of the abrasives is precise and flexible, and a cup-shaped grinding wheel with regularly and orderly arranged abrasive grains is obtained.

[0008] In order to achieve the above purpose, a technical solution adopted by the present invention is:

[0009] A preparation device for a cup-shaped grinding wheel with orderly arranged abrasive grains, comprising: a frame; a workbench, arranged on the frame, the position of the workbench on the frame being adjusted by a workbench position adjustment mechanism, and the grinding wheel base being placed on the workbench for processing; an abrasive spreading device, arranged on the frame, the abrasive spreading device being used for spraying abrasive grains on the grinding wheel base; and a laser sintering device, arranged on the frame, for sintering in real time the abrasive grains scattered on the grinding wheel base.

[0010] Furthermore, the abrasive spreading device includes: a first casing, arranged on the frame through a first base, the first casing and the first base forming a storage bin; a side cover, arranged on the first casing; a suction and spraying mechanism, including a first transmission mechanism, an eccentric driven wheel, a plunger and a material transfer disk, the output of the first transmission mechanism being transmitted to the eccentric driven wheel; the eccentric driven wheel and the plunger being connected by a pin shaft; the material transfer disk being arranged on the first casing through a bearing, the first casing and the first base forming the storage bin, the side cover and the first casing enclosing a material transfer bin, the lower part of the material transfer bin being an arc-shaped slide rail, and the material transfer disk being provided with a chute for sliding along the slide rail; the discharge port of the storage bin being arranged on the first casing through a partition between the storage bin and the material transfer bin; a material transfer cylinder being arranged inside the material transfer disk, one end of the plunger extending into the material transfer cylinder, and a temporary storage bin being arranged at the other end of the material transfer cylinder; a material transfer outlet being arranged on the first casing; and a spraying port, connected to the material transfer outlet through a spraying channel, the spraying channel and the spraying port being arranged on the first casing.

[0011] Furthermore, the first transmission mechanism includes: a first motor, arranged on the first casing; a first driving wheel, the output of the first motor being transmitted to the first driving wheel; a first driven wheel, connected to the first driving wheel by a belt, the eccentric driven wheel and the first driven wheel being located on both sides of the main side wall of the first casing, and the first driven wheel being output to the eccentric driven wheel through a bearing.

[0012] Furthermore, a gasket is arranged at the connection between the side cover and the first casing, and a sealing ring is arranged at the contact part between the plunger and the material transfer cylinder.

[0013] Further, the workbench position adjusting mechanism includes: a second transmission mechanism, including a second motor, a second driving wheel, and a second driven wheel, where the output of the second motor is transmitted to the second driving wheel, and the second driving wheel is connected to the second driven wheel through a belt; a lead screw, one end of which passes through the frame and is connected to the second driven wheel, and the other end passes through the workbench and is rotatably arranged on the frame, and the workbench can move along the lead screw during the rotation of the lead screw; and a limiting rod, which passes through the workbench and is arranged on the frame, and the workbench can slide along the limiting rod.

[0014] Further, the workbench includes: a second base, through which the lead screw and the limiting rod pass and are arranged on the frame, and a receiving groove is arranged on the second base; a rotating motor, arranged in the receiving groove, and the output of the rotating motor is transmitted to the grinding wheel rotating seat; and a grinding wheel rotating seat, provided with a rotating part, the rotating part is arranged in the receiving groove, the rotating part is located above the rotating motor and is connected to the rotating motor through a rotating shaft, and the grinding wheel base is arranged in the grinding wheel receiving groove of the grinding wheel rotating seat.

[0015] The present invention also provides a method for preparing a cup-shaped grinding wheel based on the preparation device of the cup-shaped grinding wheel with orderly arranged abrasive grains as described in any one of the above, including the following steps: S10 Loading abrasive, placing the abrasive in the abrasive spreading device; S20 Placing the grinding wheel base, placing the grinding wheel base on the workbench, and then placing the workbench below the laser sintering device; S30 Spraying abrasive, starting the abrasive spreading device to spray abrasive onto the grinding wheel base; and S40 Sintering, starting the laser sintering device to sinter the abrasive on the grinding wheel base in real time.

[0016] Further, the rotational speed of the eccentric driven wheel is 1000 - 2000 r / min; the rotational speed of the grinding wheel rotating seat is 0.1 - 5 r / min; the moving speed of the workbench is 5 - 15 mm / s.

[0017] Further, the abrasive includes abrasive grains and a metal binder, and the particle size of the abrasive grains is 60 - 200 mesh.

[0018] Further, the laser pulse frequency of the laser sintering device is 0.3 - 1 kHz, the power is 30 - 100 W, and the relative scanning speed is 1 - 5 mm / s.

[0019] The above technical solution of the present invention has the following advantages compared with the prior art:

[0020] (1) A preparation device and method for a cup-shaped grinding wheel with orderly arranged abrasive grains according to the present invention realize quantitative negative pressure suction and positive pressure spraying of materials in a temporary storage bin through the reciprocating motion of an eccentric driven wheel, and combine a workbench position adjustment mechanism to achieve orderly and regular arrangement of abrasives on the end face of the grinding wheel base. At the same time, a laser sintering device sinters the abrasives on the end face of the grinding wheel base. The arrangement of the abrasives is precise and flexible, and a cup-shaped grinding wheel with regularly arranged abrasive grains is obtained.

[0021] (2) A preparation device and method for a cup-shaped grinding wheel with orderly arranged abrasive grains according to the present invention are applicable to cup-shaped grinding wheels prepared from abrasives of various materials. The preparation device of the present invention has a simple structure and is easy to operate, which is beneficial to improving the manufacturing efficiency of grinding tools. Description of the Drawings

[0022] The technical solutions and their beneficial effects of the present invention will become obvious by describing the specific embodiments of the present invention in detail with reference to the accompanying drawings.

[0023] Figure 1 The following shows the structural diagram of a preparation device for a cup-shaped grinding wheel with orderly arranged abrasive grains according to an embodiment of the present invention;

[0024] Figure 2 The following shows the structural diagram of the abrasive spreading device after removing the side cover according to an embodiment of the present invention;

[0025] Figure 3 The following shows the partial cross-sectional view of the first housing of the abrasive spreading device according to an embodiment of the present invention;

[0026] Figure 4 The following shows the structural cross-sectional view of the abrasive spreading device in the state of sucking materials (upper limit position 1) according to an embodiment of the present invention;

[0027] Figure 5 The following shows the structural cross-sectional view of the abrasive spreading device in the state of spraying materials (lower limit position 2) according to an embodiment of the present invention;

[0028] Figure 6 The following shows the partial cross-sectional view of the material transfer tray according to an embodiment of the present invention;

[0029] Figure 7 The following shows the cross-sectional view of the workbench according to an embodiment of the present invention;

[0030] Figure 8 The following shows the flow chart of the preparation method for a cup-shaped grinding wheel with orderly arranged abrasive grains according to an embodiment of the present invention;

[0031] Figure 9 The following shows the structural diagram of a cup-shaped grinding wheel with abrasives arranged in concentric circles according to an embodiment of the present invention;

[0032] Figure 10The figure shows a structural diagram of a cup-shaped grinding wheel with abrasive grains arranged in a fan-shaped circumference according to an embodiment of the present invention;

[0033] Figure 11 The figure shows a structural diagram of a cup-shaped grinding wheel with abrasive grains arranged in a spiral according to an embodiment of the present invention.

[0034] Reference numerals in the figure:

[0035] 1 frame, 2 workbench, 21 second base, 22 rotating motor, 23 grinding wheel rotating seat, 231 rotating part, 3 abrasive spreading device, 31 first housing, 32 first base, 33 storage bin, 331 discharge port, 341 first motor, 342 first driving wheel, 343 first driven wheel, 344 eccentric driven wheel, 345 plunger, 346 material moving plate, 347 material moving cylinder, 348 temporary storage bin, 349 material moving outlet, 35 partition plate, 36 material moving bin, 37 material spraying port, 38 material spraying channel, 39 side cover, 4 laser sintering device, 51 second driving wheel, 52 second driven wheel, 53 lead screw, 54 limiting rod, 6 grinding wheel base body, 7 material limiting part, 8 sealing ring. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present invention.

[0037] This embodiment provides a preparation device for a cup-shaped grinding wheel with abrasive grains arranged orderly, as Figure 1 shown, including a workbench 2, an abrasive spreading device 3, a laser sintering device 4 and a workbench position adjusting mechanism arranged on the frame 1. The grinding wheel base body 6 is placed on the workbench 2 for processing. The abrasive spreading device 3 is used to spray abrasives on the grinding wheel base body 6. The laser sintering device 4 is used to sinter the abrasives scattered on the grinding wheel base body 6 in real time. The workbench position adjusting mechanism is used to adjust the position of the workbench. Generally, the inner diameter of the grinding wheel base body 6 is 30 - 50 mm, and the outer diameter is 100 - 150 mm.

[0038] As Figures 2 to 5As shown, the abrasive spreading device 3 includes a first housing 31, a suction and spraying mechanism, a spraying port 37, and a side cover 39. The abrasive spreading device 3 is arranged on the frame 1 through a first base 32. The first housing 31 and the first base 32 form the storage bin 33. The bottom of the storage bin 33 is provided with a slope of 45° to 60°, which facilitates the abrasive in the storage bin 33 to flow into the discharge port 331 under the action of gravity. The side cover 39 and the first housing 31 enclose a material transfer bin 36. The lower part of the material transfer bin 36 is an arc-shaped slide rail, and a chute is provided on the material transfer disk 346 so that it can slide along the slide rail. The side cover 39 is arranged on the first housing 31, and a sealing gasket is arranged at the connection between the side cover 39 and the first housing 31.

[0039] The suction and spraying mechanism includes a first transmission mechanism, an eccentric driven wheel 344, a plunger 345, and the material transfer disk 346. The output of the first transmission mechanism is connected to the eccentric driven wheel 344, and the eccentric driven wheel 344 and the plunger 345 are connected by a pin shaft. The material transfer disk 346 is arranged on the first housing 31 through a bearing. The discharge port 331 of the storage bin 33 is arranged on the first housing 31 through the partition plate 35 between the storage bin 33 and the material transfer bin 36. As Figure 6As shown, a material transfer cylinder 347 is provided inside the material transfer tray 346. One end of the plunger 345 extends into the material transfer cylinder 347, and a temporary storage bin 348 is arranged at the other end of the material transfer cylinder 347. A material transfer outlet 349 is provided on the first housing 31. The spraying port 37 is connected to the material transfer outlet 349 through a spraying channel 38. The spraying channel 38 and the spraying port 37 are arranged on the first housing 31. The apertures of the spraying channel 38, the spraying port 37, the material transfer outlet 349, and the discharging port 331 are preferably 0.15 - 0.45 mm. Driven by the first transmission mechanism, the eccentric driven wheel 344 drives the plunger 345 to perform a crank motion. During the entire movement process, the material transfer tray 346 always abuts against the slide rail. The initial position of the plunger 345, the position of the discharging port 331, and the position of the material transfer outlet 349 are set such that when the temporary storage bin 348 moves to the discharging port 331, the plunger 345 reaches the upper limit position one, ensuring that a negative pressure environment is formed inside the material transfer cylinder 347 at this time; when the temporary storage bin 348 moves to the material transfer outlet 349, the plunger 345 reaches the lower limit position two, and a positive pressure environment is formed inside the material transfer cylinder 347. When the temporary storage bin 348 moves to the discharging port 331, the plunger 345 forms a negative pressure environment inside the material transfer cylinder 347 during the upward movement process, and the abrasive at the discharging port 331 is sucked into the temporary storage bin 348. As the eccentric driven wheel 344 continues to rotate, the plunger 345 moves downward, and a positive pressure environment is formed inside the material transfer cylinder 347. When the temporary storage bin 348 moves to the material transfer outlet 349, under the action of the positive pressure, the abrasive inside the temporary storage bin 348 is output to the spraying port 37 through the spraying channel 38, and then sprayed on the grinding wheel base 6. The distance between the spraying port 37 and the upper surface of the grinding wheel base 6 is about 5 mm to ensure the spraying effect. To ensure that a negative pressure environment can be formed inside the material transfer cylinder 347, a sealing ring 8 is arranged at the part where the plunger 345 abuts against the material transfer cylinder 347. A material limiting part 7 is arranged at the connecting part between the temporary storage bin 348 and the material transfer cylinder 347. By controlling the shape of the material limiting part 7, the amount of material suction and spraying each time can be controlled, and thus the shape of the abrasive scattered on the grinding wheel base 6 can be controlled.

[0040] The first transmission mechanism includes a first motor 341, a first driving wheel 342 and a first driven wheel 343. The first motor 341 is arranged on the first housing 31. The output of the first motor 341 is transmitted to the first driving wheel 342. The first driven wheel 343 is connected to the first driving wheel 342 by a belt. The eccentric driven wheel 344 and the first driven wheel 343 are located on both sides of the main side wall of the first housing 31. The first driven wheel 343 is transmitted to the eccentric driven wheel 344 through a bearing. The rotation speed of the eccentric driven wheel 344 is preferably 1000-2000 r / min.

[0041] The workbench position adjusting mechanism includes a second transmission mechanism 5, a lead screw 54 and a limit rod 55. The second transmission mechanism 5 includes a second motor, a second driving wheel 52 and a second driven wheel 53. The second motor is arranged on the frame. The output of the second motor is transmitted to the second driving wheel 52. The second driving wheel 52 is connected to the second driven wheel 53 by a belt. One end of the lead screw 54 passes through the frame 1 and is connected to the second driven wheel 53. The other end of the lead screw 54 passes through the workbench 2 and is rotatably arranged on the frame 1. The workbench 2 can move along the lead screw 54 during the rotation of the lead screw 54. The limit rod 55 passes through the workbench 2 and is arranged on the frame 1. The workbench 2 can slide along the limit rod 55. The second motor realizes the axial movement of the workbench 2 along the lead screw 54 through forward and reverse rotation. The limit rod 55 is used to limit the workbench 2 to ensure the stability of the sliding of the workbench 2 and prevent the workbench 2 from shifting during the sliding process and affecting the preparation effect. The second motor controls the moving speed of the workbench 2 to be 5-15 mm / s.

[0042] The laser pulse frequency of the laser sintering device 4 is 0.3-1 kHz, the power is 30-100 W, and the relative scanning speed is 1-5 mm / s. The laser sintering device 4 includes a laser, and the laser is a YAG solid laser. A polarizing mirror is arranged in the laser head of the laser, and the laser beam can be scanned in the horizontal plane through the polarizing mirror to control the sintering range.

[0043] As Figure 7As shown, the workbench 2 includes a second base 21, a rotary motor 22 and a grinding wheel rotating seat 23, the screw rod 54 and the limit rod 55 are arranged on the frame 1 through the second base 21, and a receiving groove is arranged on the second base 21. The rotary motor 22 is arranged in the receiving groove, and the rotary motor 22 outputs to the grinding wheel rotating seat 23. The grinding wheel rotating seat 23 is provided with a rotating part 231, and the rotating part 231 is arranged in the receiving groove. The rotating part 231 is located above the rotary motor 22 and is connected to the rotary motor 22 through a rotating shaft, and the grinding wheel base 6 is arranged in the grinding wheel receiving groove of the grinding wheel rotating seat 23. In the process of preparing the cup-shaped grinding wheel, the control system controls the first motor 341, the second motor and the rotary motor 22 to cooperate with each other, realize spraying while controlling the shape of the spraying on the surface of the grinding wheel base 6, obtain a preset spraying shape, and conveniently manufacture a cup-shaped grinding wheel with abrasive particles arranged in a regular and orderly manner such as concentric circles, spirals, and sectors. The rotation speed of the grinding wheel rotating seat 23 under the control of the rotating motor 22 is preferably 0.1-5 r / min. The grinding wheel rotating seat 23 is connected to the output shaft of the rotating motor 22 through a thrust ball bearing, which avoids wear between components and improves the life of the equipment.

[0044] like Figure 8 As shown, the present invention also provides a method for preparing a cup-shaped grinding wheel based on the preparation device of the cup-shaped grinding wheel with orderly arrangement of abrasive particles, comprising the following steps: S10 loading abrasive, placing the abrasive in the abrasive spreading device 3. S20 placing the grinding wheel base 6, placing the grinding wheel base 6 on the workbench 2, and then placing the workbench 2 under the laser sintering device 4. S30 spraying abrasive, starting the abrasive spreading device 3 to spray abrasive on the grinding wheel base 6. And S40 sintering, starting the laser sintering device 4 to sinter the abrasive on the grinding wheel base 6 in real time.

[0045] The abrasive material comprises abrasive grains and a metal binder, and the grain size of the abrasive grains is 60-200 meshes.

[0046] The preparation method of the present invention is described using the grinding wheels with these three abrasive arrangement modes:

[0047] Example 1

[0048] S10 is a cup-shaped grinding wheel with a base inner diameter of 30 mm, an outer diameter of 100 mm, a grinding wheel grit of 100 (i.e., abrasive grain circumferential spacing of 0.255 mm, abrasive grain radial spacing of 0.255 mm), and abrasive grains arranged in concentric circles as a specific example. Figure 9 Abrasive materials which are fully mixed with SiC abrasive grains and bronze binder are added into the storage bin 33 .

[0049] When the abrasives are arranged in concentric circles

[0050] and \(n\in Z\), (1)

[0051] Then the working radius of the \(n\)th circle is:

[0052] \(R_2+(n - 1)\cdot b\), (2)

[0053] The time interval for abrasive to fall

[0054]

[0055] If calculated by arc length

[0056]

[0057] When spraying abrasive for each circle, the grinding wheel base body 6 does not translate but only rotates. At the end of each circle, the grinding wheel base body 6 translates to start a new circle. It can be known that in the ideal case, the time for the grinding wheel base body 6 to complete translation is exactly the time interval \(\Delta t\) for abrasive to fall. Then:

[0058]

[0059] At the same time, for each circle, the grinding wheel base body 6 needs to pause during the translation movement

[0060]

[0061] From:

[0062]

[0063] We get:

[0064]

[0065] In practical applications, for the convenience and stability of control, \(a\), \(b\), \(\omega_2\), \(R_2\), \(R_1\), \(p\) are taken as known parameters

[0066] Then from (1), (4), (8), we can get:

[0067]

[0068] Among them:

[0069] and \(n\in Z\), (10)

[0070] And for each new circle, the grinding wheel base body 6 needs to pause the translation time:

[0071]

[0072] Wherein, a is the circumferential spacing of the abrasive grains, b is the radial spacing of the abrasive grains (pitch of the helix), ω1 is the rotational speed of the matrix around its own axis, ω2 is the rotational speed of the eccentric shaft, v is the translational speed of the matrix, n is the number of rows of abrasive grains arranged, R2 is the inner hole radius of the grinding wheel, R1 is the outer circle radius of the grinding wheel, p is the pitch of the lead screw, ω3 is the rotational speed of the lead screw, and c is the equal division number of the sector circumference.

[0073] S20 Move the workbench 2 to the right side of the laser sintering device 4 and place the grinding wheel matrix 6. Turn on the power supply. The second transmission mechanism drives the lead screw 35 to move, so that the workbench 2 moves to be positioned below the laser sintering device 4, and the edge of the inner cylindrical surface of the grinding wheel matrix 6 moves to be directly below the material spraying port 37.

[0074] S30 Spray abrasives. When the grinding wheel matrix 6 is in place, at this time the abrasives have gathered near the discharge port 331 due to gravity. The first transmission mechanism drives the eccentric driven wheel 344 to rotate clockwise (viewed from the right) at a speed of 1440 r / min. In each rotation of the eccentric driven wheel 344, when the material transfer disk 346 reaches the discharge port 331, the plunger 345 reaches one of its limit positions, and a negative pressure is formed in the material transfer cylinder 347 of the material transfer disk 346 to suck the abrasives; when the material transfer disk 346 reaches the material transfer outlet 349, the plunger 345 reaches the other limit position, and the abrasives are ejected from the material spraying port 37 due to positive pressure. Through the above negative pressure suction and positive pressure transportation, under the action of the material limiting part 7, a fixed amount of abrasives is obtained each time, about 0.01 mm 3 , and are ejected from the material spraying port 37 at time intervals of about 0.04 seconds. At the same time, the grinding wheel matrix 6 rotates slowly counterclockwise (viewed from above) at a speed of about 0.408 r / min, and the arrangement of the first row of abrasives is completed after about 2.45 minutes.

[0075] The workbench 2 translates axially towards the limit rod 54 at a speed of about 6.12 mm / s for 0.04 s, so that the material spraying port 37 is aligned with the starting point of the second row. The grinding wheel matrix 6 rotates slowly counterclockwise (viewed from above) at a speed of about 0.407 r / min, and the arrangement of the second row of abrasives is completed after about 2.46 minutes. And so on, each motion parameter can be calculated from formulas (9), (10), and (11).

[0076] S40 Sintering. While the abrasive grains are arranged in an orderly manner, the laser beam emitted by the laser sintering device 4 passes through the polarizer and performs a horizontal scan to sinter the arranged abrasives in real time. After the sintering of the first layer of abrasive grains is completed, the sintering of the second layer can be carried out or the workbench 3 can be moved to the right side of the laser sintering device 4 to remove the grinding wheel to complete the preparation.

[0077] Example 2:

[0078] S10 is a cup-shaped grinding wheel with a base inner diameter of 30 mm, an outer diameter of 100 mm, a grinding wheel grit of 100 (i.e., abrasive grain circumferential spacing of 0.255 mm, abrasive grain radial spacing of 0.255 mm), a sector circumference equal division of 8, and abrasive grains arranged in a sector circumference as a specific example, such as Figure 10 Abrasive materials which are fully mixed with SiC abrasive grains and bronze binder are added into the storage bin 33 .

[0079] When the abrasive is arranged in a fan-shaped circle,

[0080] In order to separate the abrasive area from the abrasive-free area, c is an even number. This mechanism achieves the absence of abrasive in some areas through the rapid rotation of the grinding wheel base within a specific time. The ideal situation is that the grinding wheel base rotates within a time interval of the abrasive falling. radian.

[0081] In the fast rotation phase:

[0082]

[0083] The other motion parameters are the same as when the abrasives are arranged in concentric circles.

[0084] S20: Move the workbench 2 to the right side of the laser sintering device 4 and place the grinding wheel base 6. Turn on the power supply, and the second transmission mechanism drives the screw 35 to move, so that the workbench 2 is moved to the bottom of the laser sintering device 4, and the inner cylindrical edge of the grinding wheel base 6 moves to the bottom of the injection port 37.

[0085] S30 spraying abrasive. When the grinding wheel base 6 is in place, the abrasive has gathered near the discharge port 331 due to gravity. The first transmission mechanism drives the eccentric driven wheel 344 to rotate clockwise (right view) at a speed of 1440r / min. In each rotation of the eccentric driven wheel 344, when the material transfer plate 346 reaches the discharge port 331, the plunger 345 reaches one of its extreme positions, and negative pressure is formed in the material transfer cylinder 347 of the material transfer plate 346 to absorb the abrasive; when the material transfer plate 346 reaches the material transfer outlet 349, the plunger 345 reaches another extreme position, and the abrasive is ejected from the spray port 37 due to positive pressure. Through the above-mentioned negative pressure suction and positive pressure delivery, under the action of the limiting part 7, a quantitative amount of abrasive is obtained each time, about 0.01mm 3, it is ejected from the material spraying port 37 at time intervals of approximately 0.04 s. Meanwhile, the grinding wheel base body 6 rotates slowly counterclockwise (viewed from above) at a speed of approximately 0.408 r / min. After approximately 18.4 s, the grinding wheel base body 6 moves counterclockwise (viewed from above) at a speed of 180 r / min for 0.04 s, causing the material spraying port 37 to reach the starting point of the next arc section. After another 18.4 s, the grinding wheel base body 6 moves counterclockwise (viewed from above) at a speed of 180 r / min for 0.04 s. This is repeated 2 times to complete the arrangement of the abrasive grains in the first circle. The workbench 2 translates axially towards the limit rod 54 at a speed of approximately 6.12 mm / s for 0.04 s, causing the material spraying port 37 to align with the starting point of the second circle. The grinding wheel base body 6 rotates slowly counterclockwise (viewed from above) at a speed of approximately 0.407 r / min. After approximately 18.5 s, the base body 36 moves counterclockwise (viewed from above) at a speed of 180 r / min for 0.04 s, causing the material spraying port 37 to reach the starting point of the next arc section. This is repeated 3 more times to complete the arrangement of the abrasive grains in the second circle. And so on, each motion parameter can be calculated from equations (9), (10), (11), and (12).

[0086] S40 Sintering. While the abrasive grains are arranged in an orderly manner, the laser beam emitted by the laser sintering device 4 passes through the polarizer and performs a horizontal scan to sinter the arranged abrasives in real time. After the sintering of the first layer of abrasive grains is completed, the sintering of the second layer can be carried out or the workbench 3 can be moved to the right side of the laser sintering device 4 to remove the grinding wheel and complete the preparation.

[0087] Example 3:

[0088] S10 Taking a cup-shaped grinding wheel with an inner diameter of 30 mm, an outer diameter of 100 mm, a grinding wheel grit size of 100 (i.e., the circumferential pitch of the abrasive grains is 0.255 mm, and the radial pitch of the abrasive grains is 0.255 mm), and the abrasive grains arranged in a spiral as a specific example, as Figure 11 shown. Abrasives in which SiC abrasive grains and a bronze binder are fully mixed are added into the storage bin 33.

[0089] When the abrasive grains are arranged in a spiral,

[0090] All motions are continuous motions without sudden changes in speed.

[0091] From the motion law, the polar coordinate equation of the arranged spiral is:

[0092]

[0093] To achieve approximately equal intervals between the abrasive grains, the eccentric shaft needs to rotate with acceleration. Calculate the distance between two abrasive piles at two moments of T and T + Δt. Since Δt is very small, this distance is regarded as an arc section with the phase radius at the T moment as the radius. Then,

[0094] a = ω1(T + Δt - T)·(R2 + vT), (14)

[0095] Also

[0096]

[0097] Obtain

[0098]

[0099] Substitute (16) and (3) into (14) and set ω3 as a known parameter, and solve to obtain:

[0100]

[0101] where T is the starting processing time.

[0102] In summary, when the abrasives are arranged in a spiral pattern, the rotational speed of the substrate:

[0103]

[0104] The eccentric shaft rotates with acceleration according to the law of formula (17).

[0105] S20 Move the workbench 2 to the right side of the laser sintering device 4 and place the grinding wheel substrate 6. Turn on the power, and the second transmission mechanism drives the lead screw 35 to move, so that the workbench 2 moves to be below the laser sintering device 4, and the edge of the inner cylindrical surface of the grinding wheel substrate 6 moves to directly below the material spraying port 37.

[0106] S30 Spray abrasives. When the grinding wheel substrate 6 is in place, at this time the abrasives have gathered near the discharge port 331 due to gravity. The workbench 2 moves in the positive X direction at a speed of 0.1 mm / s, and the grinding wheel substrate 6 rotates counterclockwise (viewed from above) at a constant speed of 23.53 r / min. The first transmission mechanism drives the eccentric drive wheel 344 to rotate clockwise (viewed from the right) at an initial speed of 1821.4 r / min and operates according to the functional relationship determined by formula (17): ω2 = 58·T + 1821.4 (r / min)(T (min)). In each rotation of the eccentric driven wheel 344, when the material transfer disk 346 reaches the discharge port 331, the plunger 345 reaches one of its limit positions, and a negative pressure is formed in the material transfer cylinder 347 of the material transfer disk 346 to suck abrasives; when the material transfer disk 346 reaches the material transfer outlet 349, the plunger 345 reaches the other limit position, and the abrasives are ejected from the material spraying port 37 due to positive pressure. Through the above negative pressure suction and positive pressure conveying, under the action of the material limiting part 7, a fixed amount of abrasives is obtained each time, about 0.01 mm 3, and is ejected from the discharge port 331 at the time interval determined by formula (3). The device operates according to the motion law described above until the arrangement of abrasive grains is completed.

[0107] S40 Sintering, while the abrasive grains are arranged in an orderly manner, the laser beam emitted by the laser sintering device 4 is scanned in the X-axis and Y-axis directions after passing through the polarizer, and the arranged abrasives are sintered in real time. After the sintering of the first layer of abrasive grains is completed, the sintering of the second layer can be carried out or the workbench 2 can be moved to the right side of the laser sintering device 4 to remove the grinding wheel and complete the preparation.

[0108] The above are only exemplary embodiments of the present invention, and do not limit the protection scope of the patent of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. Preparation device for cup-shaped grinding wheel with ordered arrangement of abrasive grains, characterized in that, Comprising: Frame; Workbench, arranged on the frame, the position of the workbench on the frame is adjusted by a workbench position adjustment mechanism, and the grinding wheel base is placed on the workbench for processing; abrasive spreading device, arranged on the frame, the abrasive spreading device is used to spray abrasive on the grinding wheel base; And a laser sintering device, arranged on the frame, for sintering in real time the abrasive scattered on the grinding wheel base; The abrasive spreading device includes: a first housing, arranged on the frame through a first base, and the first housing and the first base form a material storage bin; a side cover, arranged on the first housing; a suction and spraying mechanism, including a first transmission mechanism, an eccentric driven wheel, a plunger and a material transfer plate, the first transmission mechanism outputs to the eccentric driven wheel; the eccentric driven wheel is connected to the plunger through a pin shaft; the material transfer plate is arranged on the first housing through a bearing, the side cover and the first housing enclose a material transfer bin, the lower part of the material transfer bin is an arc-shaped slide rail, and the material transfer plate is provided with a chute to slide along the slide rail; the discharge port of the material storage bin is arranged on the first housing through a partition between the material storage bin and the material transfer bin; a material transfer cylinder is arranged in the material transfer plate, one end of the plunger extends into the material transfer cylinder, and a temporary material storage bin is arranged at the other end of the material transfer cylinder; a material transfer outlet and a spraying port are arranged on the first housing, and the spraying port is connected to the material transfer outlet through a spraying channel, and the spraying channel is arranged on the first housing; The first transmission mechanism includes: a first motor, arranged on the first housing; a first driving wheel, the first motor outputs to the first driving wheel; a first driven wheel, connected to the first driving wheel through a belt, the eccentric driven wheel and the first driven wheel are located on both sides of the main side wall of the first housing, and the first driven wheel outputs to the eccentric driven wheel through a bearing; The workbench position adjustment mechanism includes: a second transmission mechanism, including a second motor, a second driving wheel and a second driven wheel, the second motor outputs to the second driving wheel, and the second driving wheel is connected to the second driven wheel through a belt; a lead screw, one end of which passes through the frame and is connected to the second driven wheel, and the other end passes through the workbench and is rotatably arranged on the frame, and the workbench moves along the lead screw during the rotation of the lead screw; and a limiting rod, passing through the workbench and arranged on the frame, and the workbench slides along the limiting rod; The workbench includes: a second base, the lead screw and the limiting rod pass through the second base and are arranged on the frame, and a receiving groove is arranged on the second base; a rotating motor, arranged in the receiving groove, and the rotating motor outputs to a grinding wheel rotating seat; the grinding wheel rotating seat is provided with a rotating part, the rotating part is arranged in the receiving groove, the rotating part is located above the rotating motor and is connected to the rotating motor through a rotating shaft, and the grinding wheel base is arranged in the grinding wheel receiving groove of the grinding wheel rotating seat.

2. The preparation device of the cup-shaped grinding wheel with ordered arrangement of abrasive grains according to claim 1, characterized in that, A gasket is arranged at the connection between the side cover and the first housing, and a sealing ring is arranged at the contact part between the plunger and the material transfer cylinder.

3. A method for preparing a cup-shaped grinding wheel using the preparation device of the cup-shaped grinding wheel with orderly arranged abrasive grains according to any one of claims 1 to 2, characterized in that, Including the following steps: S10 Loading abrasive, placing the abrasive in the abrasive spreading device; S20 Placing the grinding wheel base, placing the grinding wheel base on the workbench, and then placing the workbench under the laser sintering device; S30 Spraying abrasive, starting the abrasive spreading device to spray abrasive on the grinding wheel base; and S40 Sintering, starting the laser sintering device to sinter in real time the abrasive on the grinding wheel base.

4. The method according to claim 3, characterized in that The rotational speed of the eccentric follower is 1000 - 2000 r / min; the rotational speed of the grinding wheel rotating seat is 0.1 - 5 r / min; the moving speed of the workbench is 5 - 15 mm / s.

5. The method according to claim 3, characterized in that, The abrasive includes abrasive grains and a metal binder, and the particle size of the abrasive grains is 60 - 200 mesh.

6. The method according to claim 3, wherein The laser pulse frequency of the laser sintering device is 0.3 - 1 kHz, the power is 30 - 100 W, and the relative scanning speed is 1 - 5 mm / s.

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