A circular saw blade sawing method and apparatus

Abstract

The present application relates to a kind of circular saw blade sawing method and device, belong to mechanical processing technical field, solve the low efficiency of existing circular saw blade sawing, the defect of high sawing arc length, circular saw blade and workpiece do reverse motion, and the rotating speed of circular saw blade is greater than the rotating speed of workpiece, workpiece and circular saw blade do the feeding motion of opposite direction, the feeding direction is parallel to the plane where the axis of circular saw blade and workpiece is, after the saw tooth of circular saw blade contacts workpiece, start to workpiece and saw cutting, circular saw blade does feeding motion, until workpiece is cut off, the sawing method of using the present application reduces sawing arc length, improves sawing efficiency.

Description

Technical Field

[0001] This invention relates to the field of machining technology, specifically to a circular saw blade sawing method and apparatus. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] Circular saw blades, as thin-disc cutting tools, possess numerous advantages such as high efficiency, high automation, wide applicability, fast cutting speed, good surface finish, and low cost, making them an indispensable tool in the metal processing field. A circular saw blade generally consists of a base, saw teeth, and mounting holes. The mounting holes connect the saw blade base to the spindle, allowing the high-speed rotation of the circular saw blade to drive multiple saw teeth to jointly complete the sawing process of the workpiece material. Circular saw blades can process a wide range of workpiece materials, which requires them to have excellent sawing performance to cope with complex sawing environments. Besides the saw teeth, base, and workpiece material, the sawing process also has a significant impact on the sawing performance and service life of the circular saw blade. Because there is a feed between the saw blade and the workpiece during the sawing process, the chip thickness in traditional sawing processes increases with the increase of the sawing arc length. According to the theory of plastic deformation of metal materials, the chip thickness directly affects the magnitude of the sawing force. When the chip thickness is large, the friction on the saw tooth surface and the sawing temperature will rise sharply, seriously affecting the service life of the circular saw blade. Increasing the sawing arc length makes it difficult for chips to be discharged in a timely manner, causing chips to be squeezed and adhered between the workpiece and the saw teeth surface, reducing the quality of the machined surface. In addition, traditional sawing processes have strict requirements on the size of circular saw blades. As the size of the workpiece material increases, the required size of the circular saw blade needs to be doubled, increasing the cost of the circular saw blade and reducing processing efficiency.

[0004] To reduce the size of circular saw blades and increase sawing efficiency, Chinese patent CN204183030U discloses a double-head circular saw machine. It installs a circular saw blade and a power unit on each side of the workpiece material, cutting simultaneously from both sides, further improving the processing efficiency of the circular saw blade. However, its sawing arc length is the length of the arc line where the circular saw blade contacts the workpiece, and the problem of increasing sawing arc length and chip thickness with increasing sawing depth still exists. Chinese patent CN 106735549B discloses a high-efficiency intelligent circular saw machine to improve processing efficiency and workpiece surface quality, but the sawing depth still needs to be greater than the workpiece diameter, resulting in a longer sawing time and lower efficiency. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a circular saw blade sawing method and apparatus that has a small sawing arc length and cutting thickness, resulting in high sawing efficiency.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] In a first aspect, embodiments of the present invention provide a circular saw blade sawing method, wherein the circular saw blade and the workpiece rotate in opposite directions, and the rotation speed of the circular saw blade is greater than the rotation speed of the workpiece. The workpiece and the circular saw blade make opposite feeding movements, and the feeding direction is parallel to the plane containing the axes of the circular saw blade and the workpiece. After the saw teeth of the circular saw blade contact the workpiece, the workpiece is cut. The circular saw blade makes feeding movements until the workpiece is cut off.

[0008] Optionally, the rotational speed of the circular saw blade is an integer multiple of the workpiece rotational speed.

[0009] Optionally, the feed distance of the circular saw blade or the workpiece per revolution is 0.05mm-1mm.

[0010] Optionally, the rotational speed range of the circular saw blade is 300-2000 r / min.

[0011] Optionally, along the feed direction, the circular saw blade remains stationary, while the workpiece moves toward the circular saw blade along the feed direction to achieve the feed motion between the workpiece and the circular saw blade;

[0012] Optionally, along the feed method, the workpiece position remains stationary, and the circular saw blade moves toward the workpiece in the feed direction to achieve the feed motion between the workpiece and the circular saw blade.

[0013] Secondly, embodiments of the present invention provide a circular saw blade sawing device, including a circular saw blade, the center of which is connected to a first rotary drive mechanism to drive the circular saw blade to rotate around its own axis. The device also includes a second rotary drive mechanism connected to a workpiece clamping member for clamping the workpiece to be processed. The output rotation direction of the second rotary drive mechanism is opposite to the conveying rotation direction of the first rotary drive mechanism, and its output speed is less than the output speed of the first rotary drive mechanism. Either the second or first rotary drive mechanism is connected to a linear motion mechanism. The output motion direction of the linear motion mechanism is parallel to the plane containing the axes of the first and second rotary drive mechanisms. The linear motion mechanism can drive the workpiece to be processed toward the circular saw blade to achieve sawing processing of the workpiece by the circular saw blade.

[0014] Optionally, the linear motion mechanism adopts a lead screw drive mechanism.

[0015] Optionally, the axes of the second rotary drive mechanism and the workpiece fixing component are located on the same horizontal plane as the axes of the first rotary drive mechanism and the circular saw blade.

[0016] Thirdly, embodiments of the present invention provide a method for operating the circular saw blade sawing device described in the second aspect, comprising the following steps:

[0017] Fix the workpiece to be sawed onto the workpiece holder;

[0018] The first and second rotary drive mechanisms work to drive the circular saw blade and the workpiece to rotate in opposite directions, with the rotational speed of the circular saw blade being greater than that of the workpiece.

[0019] The linear motion mechanism drives the circular saw blade and the workpiece to make opposite feeding movements. After the circular saw blade contacts the workpiece, it cuts the workpiece with the feeding movement until the workpiece is cut off.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. The circular saw blade sawing method of the present invention, since the circular saw blade and the workpiece rotate in opposite directions and the rotation speed of the circular saw blade is greater than that of the workpiece, when the circular saw blade and the workpiece are fed and sawed along the plane where their axes are located, the circumference of the workpiece is divided into multiple parts according to the number of saw teeth of the circular saw blade and the rotation speed ratio between the circular saw blade and the workpiece. The sawing arc length of each saw tooth is also divided into multiple parts according to the circumference of the workpiece. Moreover, as the workpiece and the circular saw blade feed, the diameter of the workpiece gradually decreases and the sawing arc length gradually decreases. Compared with the traditional method where the sawing arc length of each saw tooth is the length of the arc line of contact between the circular saw blade and the workpiece, the sawing arc length of each saw tooth is greatly reduced, thereby reducing the cutting thickness.

[0022] 2. The circular saw blade sawing method of the present invention, since the workpiece rotates during sawing, the circular saw blade saws from all directions of the workpiece, and the feed amount of the workpiece does not need to be greater than the diameter of the workpiece to achieve cutting, thereby reducing the sawing depth, shortening the sawing time, and improving the sawing efficiency. Attached Figure Description

[0023] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0024] Figure 1 This is a schematic diagram illustrating the calculation principle of the sawing arc length of each saw tooth in Embodiment 1 of the present invention;

[0025] Figure 2 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention;

[0026] Figure 3 This is a schematic diagram illustrating the working principle of Embodiment 3 of the present invention;

[0027] Figure 4 This is a schematic diagram illustrating the working principle of Embodiment 4 of the present invention;

[0028] Figure 5 This is a schematic diagram of the working principle of Comparative Example 1 of the present invention;

[0029] Figure 6This is a schematic diagram of the working principle of Comparative Example 2 of the present invention;

[0030] Among them, 1. host computer, 2. control system, 3. first servo motor, 4. output shaft, 5. circular saw blade, 6. clamping plate, 7. workpiece, 8. chuck, 9. second servo motor, 10. moving platform, 11. guide rail, 12. lead screw, 13. third servo motor, 14. chip. Detailed Implementation

[0031] Example 1

[0032] This embodiment provides a circular saw blade sawing method. The workpiece to be sawed is a cylindrical shaft. The circular saw blade rotates around its own axis, and the workpiece rotates around its own axis. The rotation direction of the circular saw blade is opposite to that of the workpiece. The rotation speed of the circular saw blade is greater than that of the workpiece. The circular saw blade and the workpiece make opposite-direction feed movements, and the feed direction is parallel to the plane containing the axes of the circular saw blade and the workpiece. When the saw teeth of the circular saw blade contact the workpiece, the workpiece is cut. The workpiece and the circular saw blade continue to make opposite-direction feed movements. The circular saw blade continuously uses its saw teeth to cut the workpiece until the workpiece is completely cut off.

[0033] The rotational speed of the circular saw blade is an integer multiple of the rotational speed of the workpiece. Preferably, the rotational speed of the circular saw blade is 300-2000 r / min, and the rotational speed of the workpiece is 1 / k of the rotational speed of the circular saw blade (k = 2, 3, 4...).

[0034] Because the circular saw blade rotates at a speed greater than that of the workpiece, the cutting edge of the saw teeth always remains in front, thus preventing the saw from chipping.

[0035] In this embodiment, the circular saw blade remains stationary along the feed direction, and the workpiece moves toward the circular saw blade to achieve feeding. The feed speed of the workpiece is related to the rotation speed of the circular saw blade. The feed distance of the workpiece is 0.05-1mm for one revolution of the circular saw blade.

[0036] In another embodiment, the workpiece remains stationary along the feed direction, while the circular saw blade moves toward the workpiece to achieve feeding. The feed speed of the circular saw blade is related to the rotational speed of the circular saw blade. The feed distance of the circular saw blade is 0.05-1mm for one revolution.

[0037] Taking a solid round bar as an example: In the traditional circular sawing method where the saw blade rotates and the workpiece remains stationary, the sawing arc length of each tooth is:

[0038]

[0039]

[0040] Where R is the workpiece radius, M1 is the common chord length of the circular saw blade workpiece, R1 is the radius of the circular saw blade, and λ is the sawing depth.

[0041] Therefore, in traditional sawing, the sawing arc length is the arc length of the contact arc between the circular saw blade and the workpiece, which gradually increases with the increase of sawing depth and then gradually decreases.

[0042] In this embodiment, as Figure 1 As shown, since both the circular saw blade and the workpiece rotate, the cutting arc length of each saw tooth in this embodiment is:

[0043]

[0044] Where R is the workpiece radius, M1 is the common chord length of the circular saw blade and the workpiece, R1 is the radius of the circular saw blade, λ is the sawing depth, T is the number of saw teeth on the circular saw blade, k is the rotational speed ratio between the circular saw blade and the workpiece, and the circumference of the workpiece is divided into T×k parts, with the central angle of each part being λ.

[0045] Therefore, in this embodiment, during sawing, the circumference of the workpiece is divided into multiple parts according to the number of saw teeth on the circular saw blade and the rotational speed ratio between the circular saw blade and the workpiece. The sawing arc length of each saw tooth is also divided into multiple parts according to the circumference of the workpiece. Moreover, as the workpiece feeds between the workpiece and the circular saw blade, the diameter of the workpiece gradually decreases, and the sawing arc length gradually decreases. Compared with the traditional method where the sawing arc length of each saw tooth is the length of the arc line of contact between the circular saw blade and the workpiece, the sawing arc length of each saw tooth is greatly reduced, thereby reducing the cutting thickness. Because the sawing arc length is reduced, the corresponding chip thickness is reduced.

[0046] Meanwhile, since both the workpiece and the circular saw blade rotate, the circular saw blade can cut from all directions of the workpiece. The feed rate of the workpiece does not need to be greater than the diameter of the workpiece to achieve the cut, which reduces the sawing depth, shortens the sawing time, and improves the sawing efficiency.

[0047] In this embodiment, when the workpiece is a solid shaft, the sawing depth is half the diameter of the workpiece. When the workpiece is a hollow tube, the sawing depth only needs to be no less than the wall thickness of the workpiece. Compared with the traditional method where the sawing depth must be greater than the diameter of the workpiece, this greatly reduces the sawing depth, shortens the sawing time, and improves the sawing efficiency.

[0048] Example 2

[0049] This embodiment provides a circular saw blade sawing device, such as... Figure 2As shown, the device includes a circular saw blade 5, the center of which is connected to a first rotary drive mechanism to drive the circular saw blade to rotate around its own axis. It also includes a second rotary drive mechanism, which is connected to a workpiece clamping component for clamping the workpiece to be processed. The output rotation direction of the second rotary drive mechanism is opposite to the conveying rotation direction of the first rotary drive mechanism, and its output speed is less than that of the first rotary drive mechanism. The second rotary drive mechanism or the first rotary drive mechanism is connected to a linear motion mechanism, which can drive the workpiece to be processed toward the circular saw blade to achieve sawing processing of the workpiece by the circular saw blade.

[0050] In this embodiment, the second rotation drive mechanism is connected to the linear motion mechanism to realize the feed motion.

[0051] Furthermore, the first rotation drive mechanism adopts a first servo motor 3, which is fixedly installed. The output shaft 4 of the first servo motor 3 is connected to the center position of the circular saw blade 5 through the clamping plate 6, so as to drive the circular saw blade 5 to rotate around its own axis.

[0052] The clamping disc 6 can be any existing circular saw blade clamping disc; its specific structure will not be described in detail here.

[0053] The first servo motor 3 is connected to the control system 2, which is installed in the control cabinet. The control system 2 can control the first servo motor 3 to work. The control system 2 is connected to the host computer 1, and its working status information can be displayed on the host computer 1. The operator can send instructions to the first servo motor 3 through the host computer 1 to control the operation of the first servo motor 3.

[0054] The second rotation drive mechanism employs a second servo motor 9, which is located on one side of the first servo motor 3. The axis of the second servo motor 9 is parallel to the axis of the first servo motor 3. The output shaft of the second servo motor 9 is connected to a workpiece fixing component, which is used to fix the workpiece to be sawed. Preferably, the workpiece fixing component is an existing chuck 7, such as a three-jaw chuck or a four-jaw chuck. Existing equipment can be used and will not be described in detail here. The second servo motor 9 can drive the workpiece 7 to rotate around its own axis through the chuck 8.

[0055] In this embodiment, the output rotation direction of the second servo motor 9 is opposite to the output rotation direction of the first servo motor 3, and the output speed of the second servo motor 9 is less than the output speed of the first servo motor 3. Preferably, the output speed of the first servo motor 3 is an integer multiple of the output speed of the second servo motor 9.

[0056] The output shaft axes of the first servo motor and the second servo motor are located on the same horizontal plane.

[0057] The linear motion mechanism adopts a screw transmission mechanism with its axis perpendicular to the first servo motor 3 and the second servo motor 9. It includes a third servo motor 13, the output shaft of which is connected to the screw 12. A moving platform 10 is threaded onto the screw 12. The two sides of the moving platform 10 are slidably connected to the fixed guide rails 11. The second servo motor 9 is fixed on the moving platform.

[0058] The third servo motor 13 operates, driving the lead screw 12 to rotate, which in turn drives the moving platform 10 to move, thereby causing the workpiece 7 to feed towards the circular saw blade 5, thus realizing the sawing of the workpiece 7 by the circular saw blade 5.

[0059] The second servo motor 9 and the third servo motor 13 are both connected to the control system 2, and their motion status can be displayed through the host computer 1. The operator can send commands to the second servo motor 9 and the third servo motor 13 through the host computer 1.

[0060] The axes of the third servo motor 13 and the lead screw 12 are parallel to the horizontal plane containing the axes of the first servo motor 3 and the second servo motor 9, so that the output motion direction of the linear motion mechanism is parallel to the plane containing the axes of the first rotary drive mechanism and the second rotary drive mechanism, thereby making the feed direction of the workpiece 7 parallel to the plane containing the axes of the workpiece 7 and the circular saw blade 5.

[0061] Example 3

[0062] This embodiment provides a working method for the circular saw blade sawing device described in Embodiment 2. The workpiece being sawed is a solid shaft-type workpiece. The diameter of the circular saw blade 5 is 255mm, the number of teeth is 40, the diameter of the workpiece 7 is 30mm, and the workpiece material is 45# steel. Figure 3 As shown, it includes the following steps:

[0063] Step 1: Install the circular saw blade 5 on the output shaft 4 of the first servo motor 3 and clamp it with the clamping plate 6. Install the workpiece 7 on the chuck 8. The axis of the circular saw blade 5 and the axis of the workpiece are in the same plane.

[0064] Step 2: Set the rotation speed of the circular saw blade 5, the rotation speed of the workpiece 7, and the feed speed on the host computer 1 through the control system 2. The rotation speed of the circular saw blade 5 is in the range of 300-2000 r / min. The rotation speed of the workpiece 7 is 1 / k of the rotation speed of the circular saw blade 5 (k=2,3,4……), and the rotation direction is opposite to the rotation direction of the circular saw blade 5. The feed speed of the workpiece 7 is related to the rotation speed of the circular saw blade. The workpiece material is fed 0.05-1.0 mm per revolution of the circular saw blade.

[0065] In this embodiment, the rotational speed of the circular saw blade 5 is set to 500 r / min, the rotational speed of the workpiece 7 is set to 250 r / min, the rotational speed ratio of the circular saw blade to the workpiece is k = 2, and the feed speed of the workpiece 7 is 0.1 mm / r.

[0066] Step 3: Based on the rotation speed of the circular saw blade and the size of the workpiece material, calculate the required sawing depth and time for sawing the workpiece using the formula λ=f·n·t (where: λ is the sawing depth, f is the workpiece feed speed, n is the rotation speed of the circular saw blade, and t is the processing time), and complete the sawing process of the workpiece.

[0067] Specifically, based on the diameter of workpiece 7, the sawing process is completed when the sawing depth is 15mm. The processing time is calculated to be 18s. The processing time is set on the host computer 1, the third servo motor works, and the moving platform drives the workpiece to move towards the circular saw blade to feed until the circular saw blade teeth begin to saw the workpiece. The workpiece continues to feed until it is completely cut off.

[0068] Using the processing method of this embodiment, the arc length of the chip 14 and the maximum sawing arc length are only 1.2 mm.

[0069] Example 4:

[0070] This embodiment provides a working method for the circular saw blade sawing device described in Embodiment 2, such as... Figure 4 As shown, the workpiece to be sawed is a hollow tube part, the diameter of the circular saw blade is 285mm, the workpiece is a 316L stainless steel pipe with a diameter of 30mm and a wall thickness of 2mm. Compared with Example 3, the difference is that the rotation speed of the circular saw blade is set to 300r / min, the rotation speed of the workpiece material is 150r / min, and the feed of the workpiece is 0.2mm / r.

[0071] The remaining steps are the same as in Example 3, and will not be repeated here.

[0072] Using the method of this embodiment, the sawing of the workpiece material is completed when the sawing depth is 2mm and the sawing time is 2s.

[0073] Comparative Example 1

[0074] This comparative example uses the traditional circular saw blade sawing method to saw solid shaft-type workpieces, such as... Figure 5 As shown, compared with Example 3, the difference is that the workpiece rotation speed is 0, while the other processing parameters are the same as in Example 3. At this time, the required sawing depth is 30mm, the processing time is 36s, and the chip arc length and the maximum sawing arc length are 30.1mm.

[0075] Comparative Example 2

[0076] This comparative example uses the traditional circular saw blade sawing method to cut hollow tube-like workpieces, such as... Figure 6 As shown, compared with Example 4, the difference is that the workpiece rotation speed is 0, while the other processing parameters are the same as in Example 4. At this time, the required sawing depth is 30mm, the processing time is 30s, and the chip arc length and maximum sawing arc length are 15.7mm.

[0077] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A circular saw blade sawing method, characterized in that, The circular saw blade and the workpiece rotate in opposite directions, and the rotation speed of the circular saw blade is greater than that of the workpiece. The workpiece and the circular saw blade make opposite feeding movements. The feeding direction is parallel to the plane containing the axes of the circular saw blade and the workpiece. After the saw teeth of the circular saw blade contact the workpiece, the workpiece is cut. The circular saw blade makes feeding movements until the workpiece is cut off. The cutting arc length of each saw tooth is: in, Let the workpiece radius be 1. The common chord length of the circular saw blade workpiece Let be the radius of the circular saw blade. The sawing depth is given by the number of teeth on the circular saw blade. The rotational speed ratio between the circular saw blade and the workpiece is The workpiece circumference is divided into Each portion has a central angle of 1. .

2. The circular saw blade sawing method as described in claim 1, characterized in that, The rotational speed of the circular saw blade is an integer multiple of the workpiece rotational speed.

3. The circular saw blade sawing method as described in claim 1, characterized in that, For each revolution of the circular saw blade, the feed distance of the circular saw blade or the workpiece is 0.05mm-1mm.

4. A circular saw blade sawing method as described in claim 1, characterized in that, The rotational speed range of the circular saw blade is 300-2000 r / min.

5. A circular saw blade sawing method as described in claim 1, characterized in that, Along the feed direction, the circular saw blade remains stationary, while the workpiece moves toward the circular saw blade along the feed direction to achieve the feed motion between the workpiece and the circular saw blade.

6. A circular saw blade sawing method as described in claim 1, characterized in that, Along the feed method, the workpiece position remains stationary, and the circular saw blade moves toward the workpiece in the feed direction to achieve the feed motion between the workpiece and the circular saw blade.

7. A circular saw blade sawing device, characterized in that, The device includes a circular saw blade, the center of which is connected to a first rotary drive mechanism to drive the circular saw blade to rotate around its own axis. It also includes a second rotary drive mechanism, which is connected to a workpiece clamping component for clamping the workpiece to be processed. The output rotation direction of the second rotary drive mechanism is opposite to the conveying rotation direction of the first rotary drive mechanism, and its output speed is less than that of the first rotary drive mechanism. The second rotary drive mechanism or the first rotary drive mechanism is connected to a linear motion mechanism, the output motion direction of which is parallel to the plane containing the axes of the first and second rotary drive mechanisms. The linear motion mechanism can drive the workpiece to be processed toward the circular saw blade to achieve sawing processing of the workpiece by the circular saw blade.

8. A circular saw blade sawing device as described in claim 7, characterized in that, The linear motion mechanism adopts a lead screw drive mechanism.

9. A circular saw blade sawing device as described in claim 7, characterized in that, The axes of the second rotary drive mechanism and the workpiece fixing part are on the same horizontal plane as the axes of the first rotary drive mechanism and the circular saw blade.

10. A method of operating the circular saw blade sawing device according to any one of claims 7-9, characterized in that, Includes the following steps: Fix the workpiece to be sawed onto the workpiece holder; The first and second rotary drive mechanisms work to drive the circular saw blade and the workpiece to rotate in opposite directions, with the rotational speed of the circular saw blade being greater than that of the workpiece. The linear motion mechanism drives the circular saw blade and the workpiece to make opposite feeding movements. After the circular saw blade contacts the workpiece, it cuts the workpiece with the feeding movement until the workpiece is cut off.

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