Band saw blade coating device and coating process thereof

Abstract

This invention relates to the field of vacuum coating technology, specifically to a band saw blade coating device and its coating process. The device includes a vacuum coating chamber, a drive mechanism with its output end located within the vacuum coating chamber, and several linkage mechanisms. A support frame, connected to the drive mechanism, is installed within the vacuum coating chamber. The support frame includes a rotatable central column. Each linkage mechanism includes a horizontal shaft rotatably connected to the central column. An inclined shaft, forming an angle with the horizontal shaft's length direction, is mounted on the inclined shaft. A rotating bearing is sleeved on the inclined shaft, and a clamping mechanism for holding the band saw blade roll is sleeved on the rotating bearing. Within the vacuum coating chamber, the band saw blade roll can not only revolve but also change its lateral and vertical angles, allowing the saw teeth to face the target material at more angles. This effectively overcomes the shadow effect caused by the existing technology's limited revolving and rotating capabilities, which results in coating blind spots and uneven film thickness on the saw tooth side. This improves the coating uniformity of all parts of the saw tooth side, especially the front tooth side.

Description

Technical Field

[0001] This invention relates to the field of vacuum coating technology, specifically to a band saw blade coating device and its coating process. Background Technology

[0002] Band saw blades, as essential tools in metal cutting, are widely used for efficient sawing of difficult-to-machine materials. With the increasing demands for cutting efficiency, precision, and tool life in modern manufacturing, optimizing the performance of band saw blades has become a focus of industry attention. In the manufacturing process of band saw blades, surface treatment technology, especially physical vapor deposition (PVD) coating technology, has become a key coating process for improving their overall performance due to its ability to enhance the hardness, wear resistance, corrosion resistance, and thermal stability of the band saw blades.

[0003] PVD coating technology is typically performed in a high-vacuum environment, depositing target atoms onto the surface of a band saw blade (serving as a substrate) through evaporation or sputtering to form a dense, hard film. Currently, vacuum coating equipment is widely used in the industry for continuous coating of rolled band saw blades. In existing technologies, the band saw blade is usually wound onto a fixed support or tray, with one side of the saw teeth facing the target, allowing the hard film to form on one side of the saw teeth.

[0004] Band saw blades differ from coatings applied to regular workpieces because the shape of the saw teeth is irregular, such as... Figure 1 As shown, the angles of the front teeth, back teeth, and tips of the band saw teeth vary. Existing vacuum coating equipment can only support the band saw blade's revolution around its central axis and rotation within the coating chamber. This limited angle adjustment in deposition results in a significant "shadowing effect." That is, the atomic flow evaporated from the target material cannot evenly cover all surfaces of the saw teeth, easily creating coating blind spots and causing uneven film thickness. This uneven coating directly leads to inconsistent wear resistance in different parts of the band saw blade during subsequent use, causing premature wear or tooth breakage in certain areas, severely affecting the band saw blade's service life and the quality of the cutting surface. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a band saw blade coating device, comprising a vacuum coating chamber and a drive mechanism. The vacuum coating chamber is equipped with a support frame and multiple clamping mechanisms for holding band saw blade rolls. The support frame includes a central column and multiple horizontal shafts evenly distributed around the circumference of the central column. The drive mechanism is used to drive the central column and the horizontal shafts to rotate around their respective axes. An inclined shaft is provided on the side of the horizontal shaft away from the central column. The clamping mechanisms are mounted on the inclined shaft via rotating bearings.

[0006] As a preferred technical solution of the present invention: the support frame includes a first chassis rotatably connected to the vacuum coating chamber, a first planetary reducer is fixedly installed inside the first chassis, the input end of the first planetary reducer is connected to the drive mechanism, and the shaft column is fixedly installed on the first chassis and rotates coaxially with it.

[0007] As a preferred technical solution of the present invention: the support frame further includes a second chassis, the second chassis is fixedly installed on the first chassis, the drive mechanism extends through the second chassis and is sleeved with a drive gear, the second chassis is rotatably connected with a number of driven gears equal to the number of the linkage mechanism, the driven gears mesh with the drive gears, and the input ends of the plurality of linkage mechanisms are connected to the plurality of driven gears in a corresponding manner.

[0008] As a preferred technical solution of the present invention: the linkage mechanism includes a transmission shaft and a first helical gear and a second helical gear meshing with each other. The transmission shaft is fixedly connected to the driven gear, and the first helical gear and the second helical gear are respectively sleeved on the transmission shaft and the horizontal shaft.

[0009] As a preferred technical solution of the present invention: the linkage mechanism is divided into two equal layers, the lower layer linkage mechanism further includes a third helical gear, the third helical gear meshes with the second helical gear, the transmission shaft in the upper layer linkage mechanism is connected to the third helical gear, and a bearing seat that is rotatably connected to the transmission shaft of the upper layer is fixedly installed on the shaft column.

[0010] As a preferred embodiment of the present invention: the clamping mechanism includes a connecting seat sleeved on the rotating bearing, an inner support clamp fixedly installed on the connecting seat, a plurality of extension rods fixedly installed on the connecting seat in the circumferential direction, bolts threaded onto the extension rods facing the inner support clamps, and clamping plates rotatably connected to the bolts.

[0011] As a preferred embodiment of the present invention: the clamping plate is arc-shaped, and a partition plate located between the clamping plate and the inner support clamp is slidably connected on the extension rod, the partition plate being arc-shaped and matching the corresponding clamping plate.

[0012] As a preferred technical solution of the present invention: the linkage mechanism includes a protective cover fixedly connected to the shaft column, and also includes a rotation mechanism. The rotation mechanism includes a transmission disk and a second planetary reducer rotatably connected to the protective cover. The side wall of the transmission disk is provided with a plurality of slots along the circumferential direction. A driven disk is fixedly installed on the clamping mechanism. The driven disk is fixedly installed with a plurality of locking pins that match the slots along the circumferential direction. The second planetary reducer is fixedly installed inside the transmission disk and its input end is sleeved with the horizontal shaft.

[0013] A band saw blade coating process, using any of the band saw blade coating apparatuses described above, includes the following steps: Step 1: Place the band saw blade roll into the vacuum coating chamber, turn on the vacuum coating chamber to evacuate the vacuum, set the rotation speed of the spindle to 1-3 rpm, when the temperature reaches 350-400℃ and the vacuum degree is 5.0*10-3Pa, introduce 100-300sccm of argon gas, turn on the bias power supply to 100-180V, and start the etching time for 15-30 minutes; Step 2: Turn on the titanium target current to 90-130A, bias voltage to 700V, and argon gas to 50-100sccm for 1-5 minutes. Step 3: Reduce the bias voltage to 60V, introduce 300sccm of nitrogen gas, set the titanium target current to 90-130A, maintain a vacuum of 6.0*10-1Pa, and allow the time to be 15-30 minutes. Step 4: Increase the bias voltage to 90V, introduce 600sccm of nitrogen gas, set the titanium target current to 90-130A, the zirconium target current to 100-150A, the vacuum degree to 7.0*10-1Pa, and the time to 20-50 minutes. Step 5: Increase the bias voltage to 120V, introduce 600sccm of nitrogen gas, introduce 300-900sccm of acetylene gas, set the titanium target current to 90-130A, the zirconium target current to 100-150A, the vacuum degree to 9.0*10-1Pa, and the time to 20-40 minutes.

[0014] As a preferred embodiment of the present invention: the band saw blade roll is cleaned before being placed into the vacuum coating chamber. The band saw blade substrate is first sandblasted, then ultrasonically cleaned for 20-40 minutes, dried after cleaning, and then composite-wound to form a band saw blade roll.

[0015] The present invention has the following beneficial effects: By setting a rotatable central column and a horizontal shaft rotatably connected to the central column, the horizontal shaft has an inclined shaft forming an angle with its length direction. A rotating bearing is sleeved on the inclined shaft, and a clamping mechanism is sleeved on the rotating bearing. The linkage mechanism is connected to the support frame for transmission. This allows the drive mechanism to drive the support frame to rotate the central column, while the linkage mechanism drives the horizontal shaft to rotate. The two ends of the inclined shaft perform conical motion, thereby enabling the clamping mechanism to achieve nutation motion. This allows the band saw blade to not only revolve in the vacuum coating chamber, but also change its horizontal and vertical angles, so that the saw teeth can face the target material at more angles. This effectively overcomes the shadow effect of coating blind spots and uneven film thickness on the saw tooth side caused by only revolving and rotating in the prior art. It improves the coating uniformity of all parts of the saw tooth side, especially the front tooth side, avoids premature wear or tooth breakage, extends the service life of the band saw blade, and ensures the quality of the cutting section. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the tooth shape of a band saw blade in the prior art.

[0017] Figure 2 This is a schematic diagram of the overall structure provided by the present invention.

[0018] Figure 3 This is a cross-sectional schematic diagram of the vacuum coating chamber provided by the present invention.

[0019] Figure 4 This is a schematic diagram of the internal structure of the vacuum coating chamber provided by the present invention.

[0020] Figure 5 This is a schematic diagram of the internal structure of the first chassis provided by the present invention.

[0021] Figure 6 This is a schematic diagram of the internal structure of the second chassis provided by the present invention.

[0022] Figure 7 This is a schematic diagram of the linkage mechanism provided by the present invention.

[0023] Figure 8 This invention provides Figure 7 Enlarged diagram of point A in the middle.

[0024] Figure 9 This is a schematic diagram of the clamping mechanism provided by the present invention.

[0025] Figure 10 This is a schematic diagram of the structure of the protective cover provided by the present invention.

[0026] Figure 11 This is a schematic diagram of the self-rotating mechanism provided by the present invention.

[0027] Figure 12 This is a schematic diagram of the transmission disc provided by the present invention.

[0028] Figure 13 This is a schematic diagram of the structure of the second planetary reducer provided by the present invention.

[0029] Appendix Figure 1-13 The structures represented by each label are listed below: 1. Vacuum coating chamber; 11. Target material; 12. Arc ignition electrode; 2. Support frame; 21. First chassis; 22. Second chassis; 23. Shaft column; 24. First planetary reducer; 241. Drive gear; 242. Reduction gear; 243. Gear ring; 25. Driving gear; 26. Driven gear; 3. Linkage mechanism; 31. Rotary bearing; 32. Drive shaft; 33. First helical gear; 34. Horizontal shaft; 35. Second helical gear; 36. Third helical gear; 37. Protective cover; 38. Annular groove; 39. Helical shaft; 4. Clamping mechanism; 41. Connecting seat; 42. Extension rod; 43. Bolt; 44. Clamping plate; 45. Internal support clamp; 46. Partition plate; 5. Rotation mechanism; 51. Transmission disc; 52. Slot; 53. Driven disc; 54. Snap pin; 55. Second planetary reducer; 6. Drive mechanism; 7. Anterior tooth side. Detailed Implementation

[0030] The principles and features of the present invention are described below. The embodiments given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0031] It should be noted that when a part or component is considered to be "connected to," "located on," or "assembled" to another part or component, it can be directly mounted on the other part or component, or it may be located in an intermediate part or component. The terms "left," "right," "upper," "lower," and similar expressions used in this document are for illustrative purposes only.

[0032] After careful research and analysis, the applicant discovered that existing band saw blades in the background technology, during coating, simply involve hanging the wound band saw blade on a frame inside the vacuum coating chamber 1, and then the drive mechanism 6 drives the frame to rotate around a central axis, causing the band saw blade to revolve around the axis. In other words, the band saw blade always rotates in a horizontal direction during coating, without any vertical rotation, resulting in a limited angle between the saw teeth and the target material 11. Figure 1 In this process, many band saw blades have irregular tooth shapes, especially the front tooth side 7, which is almost perpendicular to the length direction of the band saw blade. If the band saw blade is located vertically or nearly vertically inside the vacuum coating chamber 1, that is, the left and right sides of the band saw blade in the winding band saw blade, its teeth are also vertical or nearly vertical. Since there is no angle change in the vertical direction, its front tooth side 7 cannot be tilted and adjusted to a larger direct area towards the target material 11, resulting in less coating on the front tooth side 7.

[0033] like Figure 2-13As shown, based on the above concept, this application designs a band saw blade coating device, including a vacuum coating chamber 1 and a drive mechanism 6. A plurality of targets 11 are fixedly installed on the inner wall of the vacuum coating chamber 1, and a plurality of arc-starting electrodes 12 corresponding one-to-one with the targets 11 are also fixedly installed on the inner wall of the vacuum coating chamber 1. The targets 11 are evenly distributed on the inner wall of the vacuum coating chamber 1. Preferably, the targets 11 are distributed in multiple vertical columns at equal intervals on the inner wall of the vacuum coating chamber 1, with three and four targets in adjacent columns, respectively. The targets 11 in each column are evenly distributed, resulting in a crisscrossing distribution of the targets 11 in the vertical direction. The drive mechanism 6 is a drive motor, and the relative position of the drive mechanism 6 and the vacuum coating chamber 1 is fixed. The drive shaft of the drive mechanism 6 is located inside the vacuum coating chamber 1, i.e., the support frame 2 is connected to the drive shaft of the drive mechanism 6 via a transmission connection.

[0034] The vacuum coating chamber 1 is equipped with a support frame 2 and multiple clamping mechanisms 4 for holding band saw blade rolls. The support frame 2 includes a central column 23 and multiple horizontal shafts 34 evenly distributed around the central column 23. The drive mechanism 6 drives the central column 23 and the horizontal shafts 34 to rotate around their respective axes. An inclined shaft 39 is inclined on the side of the horizontal shaft 34 away from the central column 23. The clamping mechanisms 4 are mounted on the inclined shaft 39 via a rotating bearing 31. The contact point between the drive shaft of the drive mechanism 6 and the vacuum coating chamber 1 is sealed, so that the chamber door of the vacuum coating chamber 1 is in a sealed state after being closed. For those skilled in the art, the sealing method here and its application at the junction of similar moving and fixed parts have been widely recorded in textbooks, technical manuals or published patent documents in this field. It is a conventional technical choice that can be adopted by those skilled in the art without creative effort, and will not be described in detail here.

[0035] The axis of the central column 23 coincides with the axis of the support frame 2, so that the central column 23 can rotate around its axis when the support frame 2 rotates.

[0036] The length direction of the oblique shaft 39 is not parallel to the length direction of the horizontal shaft 34, that is, the oblique shaft 39 and the horizontal shaft 34 form an angle, which is no greater than 30°. Specifically, the oblique shaft 39 can be formed by opening an inclined annular groove 38 on the horizontal shaft 34. A rotating bearing 31 is sleeved on the oblique shaft 39, and a clamping mechanism 4 for clamping the band saw blade is sleeved on the rotating bearing 31. The input end of the linkage mechanism 3 is connected to the support frame 2 for transmission, so that the drive mechanism 6 drives the horizontal shaft 34 to rotate through the linkage mechanism 3 while driving the spindle column 23 to rotate. The rotating bearing 31 should be a bearing that can withstand a certain axial tensile force, such as a deep groove ball bearing or a tapered roller bearing. The spindle column 23 is coaxial with the vacuum coating chamber 1, that is, the spindle column 23 is located at the center of the vacuum coating chamber 1.

[0037] The operating principle is as follows: The drive mechanism 6 drives the support frame 2 to rotate, causing the spindle 23 to rotate within the vacuum coating chamber 1. The support frame 2, through the linkage mechanism 3, drives the horizontal shaft 34 to rotate simultaneously. That is, the linkage mechanism 3 rotates along with the spindle 23 while simultaneously driving the horizontal shaft 34 to rotate. When the horizontal shaft 34 rotates, the two ends of the inclined shaft 39 undergo a conical motion with their tips facing each other. Since the rotating bearing 31 can rotate on its radial surface, when the inner and outer layers of the rotating bearing 31 rotate, the inner layer rotates synchronously with the inclined shaft 39. The outer layer, being fixed to the clamping mechanism 4, which in turn clamps the band saw blade roll, has a larger mass and therefore greater inertia. This results in the outer layer not rotating or rotating at a slower speed when the inner layer rotates. Because the rotating bearing 31 is radially inclined, the horizontal shaft 34, when driving the rotating bearing 31 to rotate, causes the tilt direction of the rotating bearing 31 to change. This causes the clamping mechanism 4 to follow the tilt direction of the rotating bearing 31, thereby achieving nutation motion. The band saw blade roll can not only revolve within the vacuum coating chamber 1, but also nutate, changing the horizontal and vertical angles so that the saw teeth can face the target material 11 at more angles, resulting in more uniform coating on the saw teeth side.

[0038] Example 1 like Figure 3-5 As shown, the band saw blade coating device and its coating process in this embodiment are basically the same as the band saw blade coating device and its coating process in this application in terms of basic structure, the difference being in the specific structure of the support frame 2 and the linkage mechanism 3.

[0039] The support frame 2 includes a first chassis 21 rotatably connected to the vacuum coating chamber 1. The first chassis 21 is located at the bottom of the inner cavity of the vacuum coating chamber 1 and is rotatably connected to the inner bottom wall of the vacuum coating chamber 1 and coaxial with the vacuum coating chamber 1. A first planetary reducer 24 is fixedly installed inside the first chassis 21, and the input end of the first planetary reducer 24 is connected to the drive mechanism 6 for transmission. The first planetary reducer 24 includes a drive gear 241, a gear ring 243, and three reduction gears 242. The drive gear 241 is fixedly sleeved on the drive shaft of the drive mechanism 6. The gear ring 243 is fixedly installed on the inner wall of the first chassis 21. The three reduction gears 242 are located between the gear ring 243 and the drive gear 241 and mesh with both. A shaft is rotatably inserted into each reduction gear 242. The shaft is fixedly connected to the bottom wall of the vacuum coating chamber 1, so that the reduction gear 242 can rotate but its position is fixed, allowing the drive mechanism 6 to drive the gear ring 243 to rotate when the drive gear 241 rotates. A spindle 23 is fixedly installed on the first chassis 21 and rotates coaxially with it, thereby enabling the drive mechanism 6 to drive the spindle 23 to rotate. The first chassis 21 can effectively enclose the first planetary reducer 24, preventing the target material 11 from coating the first planetary reducer 24.

[0040] like Figure 5-8As shown, the support frame 2 also includes a second chassis 22, which is fixedly mounted on the first chassis 21. That is, the second chassis 22 is located above the first chassis 21 and rotates synchronously with the first chassis 21. A drive mechanism 6 extends into the second chassis 22 and is fitted with a drive gear 25. That is, the drive shaft of the drive mechanism 6 passes through the first chassis 21 and can rotate relative to the first chassis 21. The drive gear 25 is located within the second chassis 22 and is fixedly fitted onto the drive shaft of the drive mechanism 6. A number of driven gears 26, equal in number to the number of linkage mechanisms 3, are rotatably connected within the second chassis 22. The driven gears 26 revolve around the first chassis 21 and the second chassis 22 while also rotating on their own axis. The driven gears 26 mesh with the drive gears 25, causing the drive mechanism 6 to drive the driven gears 26 to rotate synchronously when it drives the drive gears 25 to rotate. The input ends of several linkage mechanisms 3 are connected one-to-one with several driven gears 26 to provide a power source for the linkage mechanisms 3.

[0041] The linkage mechanism 3 includes a drive shaft 32 and a first helical gear 33 and a second helical gear 35 that mesh with each other. The drive shaft 32 is fixedly connected to the driven gear 26, that is, the drive shaft 32 is fixedly inserted into the driven gear 26, and the drive shaft 32 is rotatably connected to the first chassis 21 and the second chassis 22 to support the drive shaft 32, so that the drive shaft 32 serves as the rotation axis of the driven gear 26. The first helical gear 33 and the second helical gear 35 are respectively sleeved on the drive shaft 32 and the horizontal shaft 34. The first helical gear 33 is fixed to the drive shaft 32, and the second helical gear 35 is fixed to the horizontal shaft 34, so that the vertical rotation of the drive shaft 32 is converted into the horizontal rotation of the horizontal shaft 34, thereby realizing the purpose of the support frame 2 driving the horizontal shaft 34 to rotate.

[0042] Several linkage mechanisms 3 are divided into upper and lower layers of equal number. The lower linkage mechanism 3 also includes a third helical gear 36, which meshes with a second helical gear 35. The drive shaft 32 in the upper linkage mechanism 3 is connected to the third helical gear 36. That is, the upper drive shaft 32 is fixedly inserted into the third helical gear 36, causing the third helical gear 36 to drive the upper horizontal shaft 34 to rotate. This allows the vacuum coating chamber 1 to hold both upper and lower layers of band saw blade rolls, further utilizing the space within the vacuum coating chamber 1 and enabling more band saw blade rolls to be coated in a single operation. It is worth noting that, in the case of multiple layers, a bearing seat is fixedly installed on the spindle 23, which is rotatably connected to the upper drive shaft 32. Specifically, the upper drive shaft 32 is rotatably fitted with a bearing seat, which is fixed to the spindle 23 to support the upper drive shaft 32 and prevent it from falling off. Furthermore, the lower drive shaft 32 can also be fitted with a bearing seat fixed to the shaft column 23 to prevent the support point of the lower drive shaft 32, that is, the connection between the drive shaft 32 and the first chassis 21, the rotating bearing 31 and the second chassis 22, from being too close to the bottom.

[0043] In theory, as long as the inner height of the vacuum coating chamber 1 is high enough, the number of layers of the linkage mechanism 3 can be stacked infinitely. Therefore, any changes or evolutions to the number of layers of the linkage mechanism 3 based on the essential technology of this invention are still within the protection scope of the technical solution of this invention.

[0044] Example 2 like Figure 9 As shown, the band saw blade coating device and its coating process in this embodiment are basically the same as the band saw blade coating device and its coating process in this application in terms of basic structure, except that the specific structure of the clamping mechanism 4 is different.

[0045] The clamping mechanism 4 includes a connecting seat 41 sleeved on the rotating bearing 31, and the connecting seat 41 is fixed to the outer layer of the rotating bearing 31. An inner support clamp 45 is fixedly installed on the connecting seat 41. The inner support clamp 45 is located between the rotating bearing 31 and the target material 11, shielding the rotating bearing 31 and preventing it from being coated. Several extension rods 42 are fixedly installed circumferentially on the connecting seat 41. The number of extension rods 42 should be no less than three. The extension rods 42 are evenly distributed and are L-shaped. Bolts 43 facing the inner support clamp 45 are threaded onto the extension rods 42. The bolts 43 are parallel to the connecting seat 41. A clamping plate 44 is rotatably connected to the bolt 43. One side of the clamping plate 44 is close to the extension rod 42 so that the clamping plate 44 will not rotate relative to the bolt 43 when it rotates. The multiple clamping plates 44 form a circle. The diameter of the circle can be adjusted by rotating the bolt 43 so that the clamping plate 44 clamps the outer wall of the band saw blade roll. The diameter of the inner support clamp 45 matches the inner diameter of the band saw blade roll, so that after the clamping plate 44 clamps the band saw blade roll, the inner support clamp 45 supports the inner side wall of the band saw blade roll, thereby fixing the band saw blade roll to the clamping mechanism 4.

[0046] The clamping plate 44 is arc-shaped, and its curvature matches the curvature of the band saw blade roll. A partition plate 46, also arc-shaped and matching the corresponding clamping plate 44, is slidably connected to the extension rod 42 between the clamping plate 44 and the inner support clamp 45. The partition plate 46 is used to insert into the band saw blade roll when it is too thick, increasing the stress points and preventing the band saw blade in the middle layer from slipping out. The partition plate 46 is sheet-like, and there can be multiple partition plates 46 on each extension rod 42.

[0047] Example 3 like Figure 10-13 As shown, the band saw blade coating device and its coating process in this embodiment are further improvements made on the basis of Embodiment 1, in terms of the specific structure of the self-rotating mechanism 5.

[0048] The linkage mechanism 3 includes a protective cover 37 fixedly connected to the shaft column 23. The protective cover 37 encloses the horizontal shaft 34, the second helical gear 35, the first helical gear 33, etc., to prevent the target material 11 from affecting the meshing effect of the horizontal shaft 34 and the second helical gear 35 due to the coating. It also includes a rotation mechanism 5, which includes a transmission disk 51 and a second planetary reducer 55 rotatably connected to the protective cover 37. The side wall of the transmission disk 51 has several slots 52 circumferentially formed. A driven disk 53 is fixedly mounted on the clamping mechanism 4. The transmission disk 51, the driven disk 53, and the horizontal shaft 34 are all coaxial. Several locking posts 54 matching the slots 52 are fixedly mounted circumferentially on the driven disk 53. The locking posts 54 and the slots 52 are equidistantly distributed. This ensures that during the movement of the clamping mechanism 4, one locking post 54 is always located within the slot 52, meaning that when the transmission disk 51 rotates around its axis, it can drive the clamping mechanism 4 to rotate around the horizontal shaft 34. The second planetary reducer 55 is fixedly installed inside the transmission disc 51, and its input end is sleeved with the horizontal shaft 34, so that the transmission disc 51 protects the second planetary reducer 55 and prevents it from being coated. The structure of the second planetary reducer 55 is the same as that of the first planetary reducer 24, such as... Figure 13 As shown, when the horizontal shaft 34 rotates, it drives the transmission disk 51 to rotate after being reduced in speed by the second planetary reducer 55.

[0049] By setting a self-rotating mechanism 5, when the horizontal axis 34 drives the clamping mechanism 4 to swing left and right, the self-rotating mechanism 5 simultaneously drives the clamping mechanism 4 to rotate around the horizontal axis 34, so that the clamping mechanism 4 can achieve more regular nutation motion, making the various angles of the band saw blade roll toward the target material 11 more uniform.

[0050] The above-mentioned band saw blade coating device and its coating process can be further optimized and / or improved according to actual needs: The central column 23 is prismatic, and the number of its facets is equal to the number of the linkage mechanism 3 in the same layer, so that the band saw blade rolls can be evenly placed along the circumference of the central column 23.

[0051] A band saw blade coating process, using any of the band saw blade coating devices described above, includes the following steps: Step 1: Place the band saw blade roll into vacuum coating chamber 1, turn on vacuum coating chamber 1 to evacuate, set the rotation speed of the spindle 23 to 1-3 rpm, and when the temperature reaches 350-400℃ and the vacuum degree is 5.0*10 -3 At Pa, 100-300 sccm of argon gas is introduced, the bias power supply is turned on at 100-180V, and the etching time is set for 15-30 minutes. This further removes residual contaminants adsorbed on the substrate surface and activates the surface, improving the nucleation density and adhesion of subsequent films.

[0052] Step two: Turn on the titanium target current to 90-130A, bias voltage to 700V, and argon gas at 50-100 sccm for 1-5 minutes. This deposits a dense layer of pure titanium or a titanium-based transition layer on the band saw blade surface, providing a lattice-matching interface for the subsequent growth of the nitride layer. It is important to note that the 700V bias voltage requires monitoring for arc discharge.

[0053] Step 3: Reduce the bias voltage to 60V, introduce nitrogen gas at 300 sccm, set the titanium target current to 90-130A, and maintain a vacuum level of 6.0*10. -1 Pa, time 15-30 minutes. A 0.1-0.3 micrometer thick tin underlayer is formed. This layer has high hardness and good wear resistance, while also preventing iron from the matrix from diffusing to the surface. Lower bias voltage helps reduce internal stress in the film, resulting in a dense and tough tin structure.

[0054] Step 4: Increase the bias voltage to 90V, introduce nitrogen gas at 600 sccm, set the titanium target current to 90-130A, the zirconium target current to 100-150A, and the vacuum level to 7.0*10. -1 Pa, time 20-50 minutes. This step uses a dual-target co-sputtering method to prepare a TiZrN solid solution coating with a thickness of 1-4 micrometers. The addition of Zr element can further improve the hardness, high-temperature oxidation resistance and corrosion resistance of the coating, and a 90V bias voltage helps to obtain a fine-grained microstructure.

[0055] Step 5: Increase the bias voltage to 120V, introduce nitrogen gas at 600 sccm, introduce acetylene at 300-900 sccm, set the titanium target current to 90-130A, the zirconium target current to 100-150A, and the vacuum level to 9.0*10. -1 Pa, time 20-40 minutes. The introduction of acetylene provides carbon, forming a TiZrCN multi-element composite coating with a thickness of 1-2 micrometers. This surface layer has a lower coefficient of friction and excellent self-lubricating properties, reducing frictional heat and chip adhesion during band saw cutting. Increasing the bias voltage to 120V enhances the ion bombardment effect, making the coating denser and with lower surface roughness.

[0056] The target material 11 is divided into two groups: a titanium target and a zirconium target. The titanium and zirconium targets are evenly distributed on the inner wall of the vacuum coating chamber 1. After completion, the total coating thickness is 2-5 micrometers. The final band saw blade coating has high hardness, high wear resistance, low coefficient of friction, and good anti-stripping ability. The coating thickness is also uniform, making it suitable for high-speed cutting of difficult-to-machine materials such as stainless steel and titanium alloys.

[0057] Before placing the band saw blade roll into vacuum coating chamber 1, it is cleaned: The band saw blade substrate is first sandblasted and then ultrasonically cleaned for 20-40 minutes, preferably at a frequency of 40-80 kHz. The cleaning solution can be deionized water or an alkaline cleaning agent to thoroughly remove micron-sized particles and oil. After cleaning, it is dried at 80-120℃ for 10-20 minutes to ensure no residual moisture remains on the substrate surface. Then, it is composite-wound to form a band saw blade roll. The band saw blade roll should be tightly bonded layer by layer to prevent it from scattering.

[0058] In this application, all devices and components whose structures are not described are commercially available devices or components.

[0059] In summary: By setting a rotatable spindle 23 and including a horizontal shaft 34 rotatably connected to the spindle 23, an inclined shaft 39 on the horizontal shaft 34 forming an angle with its length direction, a rotating bearing 31 sleeved on the inclined shaft 39, a clamping mechanism 4 sleeved on the rotating bearing 31, and a linkage mechanism 3 connected to the support frame 2, the drive mechanism 6 drives the support frame 2 to rotate the spindle 23, while the linkage mechanism 3 drives the horizontal shaft 34 to rotate, and the two ends of the inclined shaft 39 perform conical motion, thereby enabling the clamping mechanism 4 to achieve nutation motion. This allows the band saw blade to not only revolve within the vacuum coating chamber 1, but also change its horizontal and vertical angles, allowing the saw teeth to face the target material 11 at more angles. This effectively overcomes the shadow effect of coating blind spots and uneven film thickness on the saw tooth side caused by only being able to revolve and rotate in the prior art. It improves the coating uniformity of various parts of the saw tooth side, especially the front tooth side 7, avoids premature wear or tooth breakage, extends the service life of the band saw blade, and ensures the quality of the cutting section.

[0060] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the description above. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, using the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A band saw blade coating device, characterized in that: The device includes a vacuum coating chamber (1) and a drive mechanism (6). The vacuum coating chamber (1) is provided with a support frame (2) and a plurality of clamping mechanisms (4) for clamping band saw blade rolls. The support frame (2) includes a spindle (23) and a plurality of horizontal shafts (34) evenly distributed around the spindle (23). The drive mechanism (6) is used to drive the spindle (23) and the horizontal shafts (34) to rotate around their respective axes. The horizontal shafts (34) are inclined with a slant shaft (39) on the side away from the spindle (23). The clamping mechanism (4) is mounted on the slant shaft (39) through a rotating bearing (31).

2. The band saw blade coating device according to claim 1, characterized in that: The support frame (2) includes a first chassis (21) rotatably connected to the vacuum coating chamber (1). A first planetary reducer (24) is fixedly installed inside the first chassis (21). The input end of the first planetary reducer (24) is connected to the drive mechanism (6). The spindle (23) is fixedly installed on the first chassis (21) and rotates coaxially with it.

3. The band saw blade coating apparatus according to claim 2, characterized in that: It also includes a linkage mechanism (3), and the support frame (2) also includes a second chassis (22). The second chassis (22) is fixedly installed on the first chassis (21). The drive mechanism (6) passes through the second chassis (22) and is fitted with a drive gear (25). The second chassis (22) is rotatably connected with a number of driven gears (26) equal to the number of the linkage mechanism (3). The driven gears (26) mesh with the drive gears (25). The input ends of the linkage mechanisms (3) are connected to the driven gears (26) one by one.

4. The band saw blade coating apparatus according to claim 3, characterized in that: The linkage mechanism (3) includes a drive shaft (32) and a first helical gear (33) and a second helical gear (35) meshing with each other. The drive shaft (32) is fixedly connected to the driven gear (26). The first helical gear (33) and the second helical gear (35) are respectively sleeved on the drive shaft (32) and the horizontal shaft (34).

5. The band saw blade coating apparatus according to claim 4, characterized in that: The linkage mechanism (3) is divided into two equal layers, upper and lower. The linkage mechanism (3) in the lower layer also includes a third helical gear (36), which meshes with the second helical gear (35). The transmission shaft (32) in the linkage mechanism (3) in the upper layer is connected to the third helical gear (36). A bearing seat that is rotatably connected to the transmission shaft (32) in the upper layer is fixedly installed on the shaft column (23).

6. The band saw blade coating apparatus according to claim 1, characterized in that: The clamping mechanism (4) includes a connecting seat (41) sleeved on the rotating bearing (31), an inner support clamp (45) fixedly installed on the connecting seat (41), and a plurality of extension rods (42) fixedly installed on the connecting seat (41) in the circumferential direction. Bolts (43) facing the inner support clamp (45) are threadedly connected to the extension rods (42), and clamping plates (44) are rotatably connected to the bolts (43).

7. The band saw blade coating apparatus according to claim 6, characterized in that: The clamping plate (44) is arc-shaped, and a partition plate (46) is slidably connected on the extension rod (42) between the clamping plate (44) and the inner support clamp (45). The partition plate (46) is arc-shaped and matches the corresponding clamping plate (44).

8. A band saw blade coating apparatus according to claim 4, characterized in that: The linkage mechanism (3) includes a protective cover (37) fixedly connected to the shaft column (23), and a rotation mechanism (5). The rotation mechanism (5) includes a transmission disk (51) rotatably connected to the protective cover (37) and a second planetary reducer (55). The side wall of the transmission disk (51) is provided with a plurality of slots (52) along the circumferential direction. A driven disk (53) is fixedly installed on the clamping mechanism (4). A plurality of locking pins (54) matching the slots (52) are fixedly installed on the driven disk (53) along the circumferential direction. The second planetary reducer (55) is fixedly installed inside the transmission disk (51) and its input end is sleeved with the horizontal shaft (34).

9. A band saw blade coating process, characterized in that: Using a band saw blade coating apparatus as described in any one of claims 1-8 includes the following steps: Step one, the band saw blade roll into vacuum coating chamber (1), open vacuum coating chamber (1) for vacuum, set the speed of the shaft column (23) is 1-3rpm, when the temperature reaches 350-400℃, vacuum degree 5.0*10 -3 Pa, into 100-300sccm argon, open bias power 100-180V, open etching time 15-30 minutes; Step 2: Turn on the titanium target current to 90-130A, bias voltage to 700V, and argon gas to 50-100sccm for 1-5 minutes. Step 3: Reduce the bias voltage to 60V, introduce nitrogen gas at 300 sccm, set the titanium target current to 90-130A, and maintain a vacuum level of 6.0*10. -1 Pa, time 15-30 minutes; Step 4: Increase the bias voltage to 90V, introduce nitrogen gas at 600 sccm, set the titanium target current to 90-130A, the zirconium target current to 100-150A, and the vacuum level to 7.0*10. -1 Pa, time 20-50 minutes; Step 5: Increase the bias voltage to 120V, introduce nitrogen gas at 600 sccm, introduce acetylene at 300-900 sccm, set the titanium target current to 90-130A, the zirconium target current to 100-150A, and the vacuum level to 9.0*10. -1 Pa, time 20-40 minutes.

10. A band saw blade coating process according to claim 9, characterized in that: Before placing the band saw blade roll into the vacuum coating chamber (1), it is cleaned: The band saw blade substrate is first sandblasted, then ultrasonically cleaned for 20-40 minutes, dried after cleaning, and then composite wound to form a band saw blade roll.

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