A variable helix angle vibration damping type milling cutter assembly

Abstract

The present application relates to the technical field of milling cutter, in particular to a variable helix angle vibration reduction type milling cutter assembly, which comprises a connecting disc, a vibration reduction assembly, a milling cutter, a sliding frame, a sleeve rod, a second spring and a damping block, the variable helix angle arranged on the milling cutter can effectively reduce the vibration when the milling cutter is subjected to high-frequency vibration, so as to avoid affecting the normal work of the milling cutter, when the milling cutter is subjected to low-frequency vibration, the damping block will slide upward under the force brought by the vibration, so as to extrude the second spring, and also push the sliding shaft of the sleeve rod to start to contract, the second spring will generate elastic force after being compressed, so as to drive the damping block and the sliding shaft of the sleeve rod to reset, when the damping block is bounced back, the force brought by the vibration will be offset, and when the sliding shaft of the sleeve rod slides in the sleeve rod, there is friction, so the force brought by the vibration can also be consumed, so that the effect of effectively reducing the vibration is achieved, and the low-frequency vibration and the high-frequency vibration can be effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of milling cutter technology, specifically to a variable helix angle vibration-damping milling cutter assembly. Background Technology

[0002] Helical angle vibration damping end mill assembly is an advanced tool structure that can suppress vibrations during cutting by optimizing tool geometry parameters. Its main function is to improve machining stability, surface quality and tool life, and it is especially suitable for precision machining of difficult-to-machine materials or thin-walled and slender structural parts.

[0003] Traditional helix angle vibration-damping milling cutter assemblies mainly rely on internal damping mechanisms to suppress low-frequency vibrations, while variable helix angle cutters suppress high-frequency resonances through geometric structures. These two devices can suppress high or low-frequency resonances, but their damping mechanisms are different, and the effects they can achieve are also different. Although helix angle cutters can suppress high-frequency resonances through geometric structures, they are difficult to achieve good damping effects on low-frequency vibrations caused by machining. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a variable helix angle vibration-damping end mill assembly that combines geometric vibration reduction of the cutter head with physical vibration reduction of the cutter shank, thereby improving the vibration reduction effect.

[0005] To address the problems in the prior art, this invention provides a variable helix angle vibration-damping milling cutter assembly, including a connecting plate. The vibration-damping assembly is mounted on the connecting plate. The upper end of the milling cutter is fixedly connected to the lower end of a threaded column. The milling cutter has a variable helix angle. Multiple sets of mounting slots are formed inside the milling cutter. A sliding frame is slidably connected to the mounting slots inside the milling cutter, and the two sides of the sliding frame are arc-shaped to allow coolant to smoothly enter the mounting slots. The upper end of a sleeve is fixedly connected to the lower end of the sliding frame. The output shaft of the sleeve is fixedly connected to the upper end of a damping block. A second spring is installed between the sliding frame and the damping block. The damping block is slidably connected to the mounting slots inside the milling cutter, and the weight of the damping block is 0.5–1g.

[0006] Specifically, a set of tool holders is fixedly installed at the lower end of the connecting plate. A set of damping shock absorbers is provided inside the tool holders. The lower end of the damping shock absorbers is fixedly connected to a support block, and the support block is fixedly installed inside the tool holders.

[0007] Specifically, multiple sets of fixing cylinders are fixedly installed on the support block, and a set of metal blocks are slidably connected inside the fixing cylinders. The upper end of the metal blocks is fixedly connected to the lower end of the sliding shaft, and the sliding shaft is slidably connected inside the mounting cylinder.

[0008] Specifically, the mounting cylinder is fixedly installed on the inner wall of the tool holder. A first spring is provided inside the mounting cylinder. One end of the first spring is fixedly connected to the other end of the sliding shaft. One end of the connecting rod is fixedly connected to the outer wall of the sliding shaft. The connecting rod is slidably connected in a groove opened on the outer wall of the tool holder.

[0009] Specifically, one end of the connecting frame is fixedly connected to the outer wall of the sliding frame, and the other end of the connecting frame is fixedly connected to the outer wall of the connecting plate. A set of infrared emitters is installed in the slot opened on the side wall of the sliding frame. There is a gap between the infrared emitters and the milling cutter. Multiple sets of sensing bases are installed on the milling cutter.

[0010] Specifically, the connecting plate is fixedly installed at the lower end of the water bladder, the water bladder is fixedly connected to the outer wall of the handle by a plate, multiple sets of first liquid outlet pipes are fixedly installed on the outer wall of the water bladder, the upper end of the water bladder is connected to the water supply through a pipe, and an electronic valve is provided inside the first liquid outlet pipe.

[0011] Specifically, multiple sets of second liquid outlet pipes are fixedly installed at the lower end of the water bladder. The second liquid outlet pipe is equipped with a spring check valve inside. The second liquid outlet pipe is fixedly connected to the connecting plate. The water outlet of the second liquid outlet pipe is located directly above the mounting groove inside the milling cutter.

[0012] Specifically, the tool holder has an internal threaded connection to a set of threaded posts, the lower end of which is fixedly connected to the upper end of the milling cutter.

[0013] The beneficial effects of this invention are: 1. In this invention, when the milling cutter is subjected to low-frequency vibration, the damping block will be driven to slide upward, and the second spring will be compressed to form a thrust, which will counteract the force brought by the low-frequency vibration, thereby making up for the defect that the surface geometry of the milling cutter cannot effectively reduce low-frequency vibration, thereby reducing the impact of vibration on the milling cutter.

[0014] 2. In this invention, when the milling cutter is working, the force generated by the vibration is also transmitted to the tool holder. After being vibrated, the metal block will slide upward, thereby pushing the sliding shaft to retract into the interior of the mounting cylinder, and then being bounced back by the first spring, thus cooperating with the damping damper to improve the vibration reduction effect.

[0015] 3. In this invention, during the contraction process of the sliding shaft, the connecting rod will move upward, and the connecting rod will move the connecting plate upward, thereby squeezing the water bag, thereby increasing the amount of coolant sprayed from the first outlet pipe at an instant. The stronger the vibration, the more coolant is sprayed, which can effectively improve the cooling effect.

[0016] 4. In this invention, during the movement of the water bag, the sliding frame will slide inside the milling cutter, and the infrared emitter will be moved to the same water surface as the sensing base, and then sensed by the sensing base. Every 10-20 seconds (which can be set by the central control system), the sensing base will upload the number of times it senses to the central control system, and then compare it with the standard data. If it is much lower than this range, it means that the milling cutter is damaged and the work needs to be stopped immediately. This can prevent the damage to the milling cutter from going undetected and affecting the machining accuracy of the workpiece.

[0017] 5. In this invention, coolant will also flow out through the second outlet pipe during the squeezing process of the water bag, and then enter the interior of the milling cutter through the arc-shaped wall of the sliding frame, thereby reducing the heat generated by the friction of the sliding frame against the inner wall of the milling cutter and avoiding excessive temperature of the milling cutter, which would affect its service life. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a cross-sectional view of the upper part of the entire invention; Figure 3 This is a cross-sectional view of the middle layer of the entire invention; Figure 4 This is a cross-sectional view of the lower part of the entire invention; Figure 5 In this invention Figure 2 Schematic diagram of the section cut off from the inner arc; Figure 6 In this invention Figure 3 Schematic diagram of the section cut off from the inner arc; Figure 7 In this invention Figure 4 Schematic diagram of the section cut off from the inner arc; Figure 8 In this invention Figure 1 Enlarged view of point A; Figure 9 In this invention Figure 6 Enlarged view of point B.

[0020] In the diagram: 1. Connecting plate; 110. Tool holder; 111. Threaded column; 112. Milling cutter; 2. Vibration damping assembly; 210. Damping damper; 211. Support block; 212. Mounting cylinder; 213. First spring; 214. Sliding shaft; 215. Metal block; 216. Fixed cylinder; 217. Connecting rod; 218. Connecting frame; 219. Sliding frame; 220. Infrared emitter; 221. Sensing base; 223. Sleeve rod; 224. Second spring; 225. Damping block; 3. Cooling assembly; 310. Water bladder; 311. Connecting plate; 312. First liquid outlet pipe; 313. Second liquid outlet pipe. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] Example 1: As Figure 1 , Figure 4 as well as Figure 7 The variable helix angle vibration damping milling cutter assembly shown includes a connecting plate 1, a vibration damping component 2 mounted on the connecting plate 1, an upper end of a milling cutter 112 fixedly connected to the lower end of a threaded post 111, a variable helix angle on the milling cutter 112, multiple sets of mounting slots inside the milling cutter 112, a sliding frame 219 slidably connected to the mounting slots inside the milling cutter 112, and the two sides of the sliding frame 219 are arc-shaped to allow coolant to smoothly enter the mounting slots, an upper end of a sleeve rod 223 fixedly connected to the lower end of the sliding frame 219, an output shaft of the sleeve rod 223 fixedly connected to the upper end of a damping block 225, a second spring 224 mounted between the sliding frame 219 and the damping block 225, the damping block 225 slidably connected to the mounting slots inside the milling cutter 112, and the weight of the damping block 225 is 0.5-1g.

[0023] As shown above, the variable helix angle provided on the milling cutter 112 can effectively reduce vibration when it is subjected to high-frequency vibration, thus avoiding affecting the normal operation of the milling cutter 112. When the milling cutter 112 is subjected to low-frequency vibration, the damping block 225 will slide upward under the force of the vibration, thereby squeezing the second spring 224 and pushing the sliding shaft of the sleeve 223 to begin to contract. After being compressed, the second spring 224 will generate elastic force, thereby driving the damping block 225 and the sliding shaft of the sleeve 223 to reset. When the damping block 225 is bounced back, it will offset the force of the vibration. When the sliding shaft of the sleeve 223 slides in the sleeve 223, there is friction, which can also wear away the force of the vibration, thereby achieving an effective vibration reduction effect. Both low-frequency and high-frequency vibrations can be effectively reduced. Note: The weight of the end mill 112 with variable helix angle needs to be controlled. Therefore, the weight of the damping block 225 is 0.5 to 1g, and the total weight of multiple damping blocks 225 is 1 to 5g to avoid the damping block 225 being too heavy and affecting the normal operation of the end mill 112.

[0024] like Figure 1 as well as Figure 2 As shown, a set of tool handles 110 are fixedly installed at the lower end of the connecting plate 1. A set of damping dampers 210 is provided inside the tool handles 110. The lower end of the damping dampers 210 is fixedly connected to a support block 211, and the support block 211 is fixedly installed inside the tool handles 110.

[0025] A partition is opened inside the damping shock absorber 210, and a support block 211 is used for support to provide an installation environment for components such as the damping shock absorber 210, mounting cylinder 212, and fixing cylinder 216.

[0026] like Figure 1 , Figure 2 as well as Figure 5 As shown, multiple sets of fixing cylinders 216 are fixedly installed on the support block 211. A set of metal blocks 215 are slidably connected inside the fixing cylinder 216. The upper end of the metal block 215 is fixedly connected to the lower end of the sliding shaft 214. The sliding shaft 214 is slidably connected inside the mounting cylinder 212. The mounting cylinder 212 is fixedly installed on the inner wall of the handle 110. A first spring 213 is provided inside the mounting cylinder 212. One end of the first spring 213 is fixedly connected to the other end of the sliding shaft 214. One end of the connecting rod 217 is fixedly connected to the outer wall of the sliding shaft 214. The connecting rod 217 is slidably connected in a groove opened on the outer wall of the handle 110.

[0027] As shown above, when the handle 110 is subjected to low-frequency vibration, the force generated by the vibration will cause the metal block 215 to slide upward inside the fixed cylinder 216. When the metal block 215 moves upward, it will push the sliding shaft 214 to retract into the mounting cylinder 212. At the same time, the sliding shaft 214 will squeeze the first spring 213. When the first spring 213 is squeezed, it will generate a rebound force, thereby offsetting the force generated by the vibration. In addition, multiple sets of metal blocks 215, together with the damping damper 210, can achieve a better vibration reduction effect. During the upward sliding of the sliding shaft 214, it will drive the connecting rod 217 to move together, thereby pulling the connecting plate 311 to squeeze the water bag 310.

[0028] like Figure 1 , Figure 3 , Figure 6 , Figure 8 as well as Figure 9 As shown, one end of the connecting frame 218 is fixedly connected to the outer wall of the sliding frame 219, and the other end of the connecting frame 218 is fixedly connected to the outer wall of the connecting plate 311. A set of infrared emitters 220 are installed in the slots opened on the side wall of the sliding frame 219. There is a gap between the infrared emitters 220 and the milling cutter 112. Multiple sets of sensing bases 221 are installed on the milling cutter 112.

[0029] During the machining process of the milling cutter 112, the sliding frame 219 will also extend upward under the pull of the water bag 310, and the damping block 225 will also generate an upward thrust due to vibration. During this process, the sliding frame 219 will drive the damping block 225 to move upward. At this time, the second spring 224 will drive the sleeve rod 223 to reset. The damping block 225 needs time to reset, thus avoiding the bottom of the damping block 225 directly hitting the inside of the milling cutter 112. If the damping block 225 directly hits the inside of the milling cutter 112, it will also generate a small amount of vibration, affecting the normal operation of the milling cutter 112. When the sliding frame 219 slides upward with the water bag 310 and the connecting frame 218, the infrared emitter 220 also moves accordingly. When the infrared emitter 220 moves to the same horizontal plane as the sensing base 221, the sensing base 221 will sense it. Every 10-20 seconds (which can be set by the central control system), the sensing base 221 will upload the number of times it senses to the central control system and then compare it with the standard data (the number of times the sensing base 221 senses when the unused milling cutter 112 is working). If it is lower than this range, it means that the milling cutter 112 is damaged and needs to be stopped immediately. This can prevent the damage to the milling cutter 112 from going undetected and affecting the machining accuracy of the workpiece.

[0030] like Figure 1 , Figure 3 as well as Figure 6As shown, the connecting plate 311 is fixedly installed at the lower end of the water bladder 310. The water bladder 310 is fixedly connected to the outer wall of the cutter handle 110 via a plate. Multiple sets of first liquid outlet pipes 312 are fixedly installed on the outer wall of the water bladder 310. The upper end of the water bladder 310 is connected to the water supply via a pipe. An electronic valve is provided inside the first liquid outlet pipe 312. Multiple sets of second liquid outlet pipes 313 are fixedly installed at the lower end of the water bladder 310. A spring one-way valve is provided inside the second liquid outlet pipe 313. The second liquid outlet pipe 313 is fixedly connected to the connecting plate 311. The outlet of the second liquid outlet pipe 313 is located directly above the mounting groove inside the milling cutter 112.

[0031] During the vibration of the milling cutter 112, the first outlet pipe 312 continuously sprays out coolant to cool the milling cutter 112. The force generated by the vibration will move the fixed cylinder 216, and the fixed cylinder 216 will slide upward with the connecting rod 217 and the connecting frame 218, thereby squeezing the water bag 310. After the water bag 310 is squeezed, the amount of coolant sprayed out by the first outlet pipe 312 will increase, thereby enhancing the cooling effect. When the water bag 310 is squeezed, the spring check valve in the second outlet pipe 313 will also open, and the coolant will be poured into the slot opened in the milling cutter 112 through the second outlet pipe 313, reducing the heat of friction between the sliding frame 219 and the milling cutter 112. As more and more coolant is added to the slot of the milling cutter 112, it will overflow and flow down the side wall of the milling cutter 112, thereby enhancing the cooling effect. Note: Water bladder 310 does not serve a storage function, but rather a transitional function. Its upper end has a pipe connected to the water supply point, which continuously pours coolant into water bladder 310. This pipe is equipped with an electromagnetic pressure valve, which will immediately open and replenish the water bladder 310 with the same amount of coolant when the coolant in water bladder 310 decreases.

[0032] like Figure 1 as well as Figure 2 As shown, the tool holder 110 has a set of threaded posts 111 internally threaded, and the lower end of the threaded posts 111 is fixedly connected to the upper end of the milling cutter 112.

[0033] The threaded post 111 is fixedly connected to the milling cutter 112, thereby threading the milling cutter 112 into the inside of the tool holder 110 for easy replacement or maintenance.

[0034] Working principle: In this invention, when the handle 110 is subjected to low-frequency vibration, the force generated by the vibration causes the metal block 215 to slide upward inside the fixed cylinder 216. As the metal block 215 moves upward, it pushes the sliding shaft 214 to retract into the mounting cylinder 212. At the same time, the sliding shaft 214 compresses the first spring 213. When the first spring 213 is compressed, it generates a rebound force, thereby offsetting the force generated by the vibration. Furthermore, multiple sets of metal blocks 215, in conjunction with the damping damper 210, can achieve a better vibration reduction effect. During the upward sliding of the sliding shaft 214, it will drive the connecting rod 217 to move together, thereby pulling the connecting plate 311 to compress the water bag 3. 10. Simultaneously, the first outlet pipe 312 continuously sprays coolant to cool the end mill 112. After the water bag 310 is squeezed, the amount of coolant sprayed from the first outlet pipe 312 increases, thereby enhancing the cooling effect. Furthermore, when the water bag 310 is squeezed, the spring-loaded one-way valve in the second outlet pipe 313 also opens, allowing coolant to flow through the second outlet pipe 313 into the slot within the end mill 112, reducing the heat generated by friction between the sliding frame 219 and the end mill 112. As more and more coolant accumulates in the slot of the end mill 112, it overflows and flows down the side wall of the end mill 112, further enhancing the cooling effect. Meanwhile, the sliding frame 219, under the influence of the water bag 310 and the connecting... As the mounting bracket 218 slides upwards, the infrared emitter 220 also moves accordingly. When the infrared emitter 220 moves to the same horizontal plane as the sensing base 221, the sensing base 221 will detect it. Every 10-20 seconds, the sensing base 221 will upload the number of detected times to the central control system and compare it with standard data. If it is lower than this range, it means that the milling cutter 112 is damaged and work needs to be stopped immediately. This can prevent the damage to the milling cutter 112 from going undetected and affecting the machining accuracy of the workpiece. The variable helix angle set on the milling cutter 112 can effectively reduce vibration when it is subjected to high-frequency vibration, avoiding damage to the milling cutter 112. Normally, when the milling cutter 112 is subjected to low-frequency vibration, the damping block 225 slides upward under the force of the vibration, thereby squeezing the second spring 224 and also pushing the sliding shaft of the sleeve 223 to begin to contract. After being compressed, the second spring 224 generates elastic force, thereby driving the damping block 225 and the sliding shaft of the sleeve 223 to reset. When the damping block 225 is bounced back, it will offset the force brought by the vibration. Moreover, when the sliding shaft of the sleeve 223 slides in the sleeve 223, there is friction, which can also wear away the force brought by the vibration, thereby achieving an effective vibration reduction effect. Both low-frequency and high-frequency vibrations can be effectively reduced.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention.

Claims

1. A variable helix angle vibration-damping milling cutter assembly, characterized in that: Including the connecting disk (1); Vibration damping component (2), which is mounted on connecting plate (1); A milling cutter (112) is fixedly connected to the lower end of a threaded post (111) at its upper end. The milling cutter (112) is provided with a variable helix angle and has multiple sets of mounting slots inside. A sliding frame (219) is slidably connected in an installation groove opened in the milling cutter (112), and the two sides of the sliding frame (219) are provided as arc surfaces; Sleeve rod (223), the upper end of which is fixedly connected to the lower end of sliding frame (219), and the output shaft of sleeve rod (223) is fixedly connected to the upper end of damping block (225); The second spring (224) is installed between the sliding frame (219) and the damping block (225); A damping block (225) is slidably connected in an installation groove opened in the milling cutter (112), and the weight of the damping block (225) is 0.5 to 1g.

2. The variable helix angle vibration-damping milling cutter assembly according to claim 1, characterized in that: A set of tool handles (110) is fixedly installed at the lower end of the connecting plate (1). A set of damping dampers (210) is provided inside the tool handles (110). The lower end of the damping dampers (210) is fixedly connected to a support block (211). The support block (211) is fixedly installed inside the tool handles (110).

3. The variable helix angle vibration-damping milling cutter assembly according to claim 2, characterized in that: Multiple sets of fixed cylinders (216) are fixedly installed on the support block (211). A set of metal blocks (215) are slidably connected inside the fixed cylinder (216). The upper end of the metal block (215) is fixedly connected to the lower end of the sliding shaft (214). The sliding shaft (214) is slidably connected inside the mounting cylinder (212).

4. The variable helix angle vibration-damping milling cutter assembly according to claim 3, characterized in that: The mounting cylinder (212) is fixedly installed on the inner wall of the tool holder (110). The inside of the mounting cylinder (212) is provided with a first spring (213). One end of the first spring (213) is fixedly connected to the other end of the sliding shaft (214). The outer wall of the sliding shaft (214) is fixedly connected to one end of the connecting rod (217). The connecting rod (217) is slidably connected in a groove opened on the outer wall of the tool holder (110).

5. A variable helix angle vibration-damping milling cutter assembly according to claim 1, characterized in that: The outer wall of the sliding frame (219) is fixedly connected to one end of the connecting frame (218), and the other end of the connecting frame (218) is fixedly connected to the outer wall of the connecting plate (311). A set of infrared emitters (220) are installed in the slots opened on the side wall of the sliding frame (219). There is a gap between the infrared emitters (220) and the milling cutter (112). Multiple sets of sensing bases (221) are installed on the milling cutter (112).

6. The variable helix angle vibration-damping milling cutter assembly according to claim 5, characterized in that: The connecting plate (311) is fixedly installed at the lower end of the water bag (310). The water bag (310) is fixedly connected to the outer wall of the knife handle (110) through the plate. Multiple sets of first liquid outlet pipes (312) are fixedly installed on the outer wall of the water bag (310). The upper end of the water bag (310) is connected to the water supply through the pipe. The first liquid outlet pipe (312) is equipped with an electronic valve inside.

7. A variable helix angle vibration-damping milling cutter assembly according to claim 6, characterized in that: The lower end of the water bladder (310) is fixedly installed with multiple sets of second liquid outlet pipes (313). The second liquid outlet pipe (313) is equipped with a spring check valve inside. The second liquid outlet pipe (313) and the connecting plate (311) are fixedly connected. The outlet of the second liquid outlet pipe (313) is located directly above the mounting groove inside the milling cutter (112).

8. A variable helix angle vibration-damping milling cutter assembly according to claim 2, characterized in that: The tool holder (110) has an internal threaded connection to a set of threaded posts (111), the lower end of which is fixedly connected to the upper end of the milling cutter (112).

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