Clamping device for machining slender shaft by numerical control whirlwind milling machine tool

Abstract

The invention discloses a clamping device for machining a slender shaft by a numerical control whirlwind milling machine, and belongs to the field of whirlwind milling machines. A clamping device for a numerical control whirlwind milling machine tool to machine a slender shaft comprises a machine tool body, a slender shaft workpiece is arranged above the machine tool body, a rotatable three-jaw chuck is arranged at one end of the slender shaft workpiece, the three-jaw chuck is installed on an installation base, and the installation base is fixed to the surface of the bottom of the machine tool body; according to the device, through the arranged inflation cavity, gas collected in the machining process of the slender shaft workpiece is conveniently conveyed into an inner cavity of the slender shaft workpiece, the strength of the slender shaft workpiece in the milling process is improved, and meanwhile a slender shaft workpiece body is not changed; and in the gas collecting process, part of gas is annularly distributed along the peripheral surface of the slender shaft workpiece for blowing to form supporting force, so that the stability of the slender shaft workpiece in the machining process is improved, and the machining precision of the device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of whirling milling machines, and particularly relates to a clamping device for machining slender shafts on a numerically controlled whirling milling machine. Background Art

[0002] In the field of machining, due to their special structural characteristics, slender shaft parts face many challenges during the machining process.

[0003] Such parts usually have a large length-to-diameter ratio, making them extremely prone to bending deformation during operations such as turning and milling on traditional machine tools, thus affecting the machining accuracy and surface quality. In addition, due to difficult clamping and poor stability, it may also lead to problems such as low production efficiency and increased scrap rate. Therefore, we propose a clamping device for machining slender shafts on a numerically controlled whirling milling machine to solve the above-mentioned problems. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem of poor stability of the clamping part and extremely prone to bending deformation during operations such as turning and milling of slender shafts in the prior art, and to propose a clamping device for machining slender shafts on a numerically controlled whirling milling machine.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions: A clamping device for machining slender shafts on a numerically controlled whirling milling machine, including a machine tool body. Above the machine tool body is provided a slender shaft workpiece. One end of the slender shaft workpiece is provided with a rotatable three-jaw chuck, and the three-jaw chuck is installed on a mounting seat, and the mounting seat is fixed on the bottom surface of the machine tool body. At the other end of the slender shaft workpiece on the top of the machine tool body is provided a clamping unit for preventing the slender shaft workpiece from deforming during machining. An air inflation cavity is arranged in the clamping unit, and an air inlet at one end thereof is communicated with the other end of the slender shaft workpiece; a sealing block is installed at the axis of the clamping position on the three-jaw chuck for limiting and blocking one end of the slender shaft workpiece; connecting cylinders are symmetrically arranged on both sides of the clamping unit. When the connecting cylinders collect gas and transport it to the air inflation cavity to inflate the inner cavity of the slender shaft workpiece, a part of the gas is shunted during the gas transportation of the connecting cylinders to blow air around the pre-machined surface of the right section of the slender shaft workpiece to form a supporting force.

[0006] Preferably, the clamping unit includes a support seat fixed on the top of the machine tool body. A tailstock is installed on the top of the support seat. An inner sliding sleeve is slidably connected inside the tailstock. One end of the inner sliding sleeve is rotatably connected to a spring collet holder through a sealed bearing, and a spring collet is installed at one end of the spring collet holder.

[0007] Preferably, inflation chambers are provided inside both the spring clip seat and the inner sliding sleeve. The diameters of the two inflation chambers are the same. One end of the spring clip seat is fixedly connected to the output end of the driving part, and the driving part is installed on one side surface of the tailstock.

[0008] Preferably, an air delivery pipe is fixed to one end of the inflation chamber. The end of the air delivery pipe is connected to one end of the connecting cylinder. An air inlet pipe a is provided at one end of the connecting cylinder. Check valves are provided at the joints between the air inlet pipe a and the air delivery pipe and the connecting cylinder. Driving parts are provided on the two connecting cylinders.

[0009] Preferably, the driving part includes a sliding rod slidably connected inside the connecting cylinder. One end of the sliding rod is fixed with a piston slidably connected to the inner wall of the connecting cylinder. The other end of the sliding rod is fixed with a semi-circular block. The end of the semi-circular block is in contact with the special-shaped disk. The special-shaped disk is fixed on the surface of the spring clip seat. A return spring is sleeved on the surface of the sliding rod. The two ends of the return spring are respectively fixedly connected to the inner wall of the connecting cylinder and the surface of the piston.

[0010] Preferably, an air inlet pipe b is provided at the other end of the connecting cylinder. The other end of the connecting cylinder is communicated with a shunt pipe. Check valves are provided at the joints between the shunt pipe and the air inlet pipe b and the connecting cylinder. One end of the shunt pipe is fixed with a jet ring. The jet ring is sleeved on the surface of the slender shaft workpiece. Nozzles are arranged at equal intervals on the inner wall of the jet ring.

[0011] Preferably, supports are fixed to both ends of the jet ring. The supports are fixedly installed together with the outer wall of the connecting cylinder. The other ends of the supports are fixedly connected to the outer wall of the tailstock.

[0012] Preferably, a pressure reducing valve is embedded on the surface of the spring clip seat. One end of the pressure reducing valve extends to the inflation chamber. The other end of the pressure reducing valve is fixed with a branch pipe. The branch pipe is communicated with one of the shunt pipes.

[0013] Preferably, symmetric slide rails are provided on the top of the machine tool body. A moving seat is slidably connected to the slide rails.

[0014] Preferably, an L-shaped plate is fixedly installed on the surface of the moving seat through bolts. A support block is fixed on the surface of the L-shaped plate. The slender shaft workpiece is slidably connected inside the L-shaped plate.

[0015] Compared with the prior art, the present invention provides a clamping device for machining a slender shaft by a numerical control whirling milling machine tool, and has the following beneficial effects: 1. The clamping device for machining slender shafts on a numerically controlled whirling milling machine clamps and limits both ends of the slender shaft workpiece in advance during the machining operation to prevent displacement. During the milling operation, the slender shaft workpiece rotates, driving one end of the clamping unit to rotate synchronously, generating airflow and then transporting it into the inner cavity of the slender shaft workpiece for filling, increasing the structural strength of the slender shaft workpiece during machining, thereby reducing the occurrence of deformation and damage.

[0016] 2. The clamping device for machining slender shafts on a numerically controlled whirling milling machine, after the connecting cylinder collects the airflow, can transport a part of the airflow to the nozzle and then spray it out to form a stable supporting force, thus facilitating the increase of the supporting stability of the slender shaft workpiece and reducing the vibration of the slender shaft workpiece during machining.

[0017] 3. The clamping device for machining slender shafts on a numerically controlled whirling milling machine, when the air pressure transported into the inner cavity of the slender shaft workpiece reaches a certain value, is discharged and then transported to the nozzle, improving the strength of the airflow support at the slender shaft workpiece, so that the supporting force of the slender shaft workpiece is increased when the slender shaft workpiece is machined to the end.

[0018] The parts not involved in this device are the same as or can be implemented using the prior art. Through the provided inflation cavity, the present invention conveniently transports the gas collected during the machining process of the slender shaft workpiece into the inner cavity of the slender shaft workpiece, increasing the strength of the slender shaft workpiece during milling, without changing the slender shaft workpiece itself, and forming a supporting force by blowing a part of the gas in a circular distribution along the peripheral surface of the slender shaft workpiece during the gas collection process, thereby improving the stability of the slender shaft workpiece during machining and the accuracy of device machining. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of a clamping device for machining slender shafts on a numerically controlled whirling milling machine proposed by the present invention; Figure 2 is a schematic top view structure diagram of a clamping device for machining slender shafts on a numerically controlled whirling milling machine proposed by the present invention; Figure 3 is proposed by the present invention Figure 2 the schematic cross-sectional structure diagram of A - A in; Figure 4 is proposed by the present invention Figure 3 the enlarged structure diagram of area A in; Figure 5 is a schematic diagram of the partial three-dimensional structure of the clamping unit in a clamping device for machining slender shafts on a numerically controlled whirling milling machine proposed by the present invention; Figure 6Schematic diagram of the local three-dimensional structure of the air jet ring in a clamping device for machining slender shafts by a numerically controlled cyclone milling machine proposed by the present invention; Figure 7 Schematic diagram of the partial cross-sectional structure of the clamping unit in a clamping device for machining slender shafts by a numerically controlled cyclone milling machine proposed by the present invention; Figure 8 Schematic diagram of the local three-dimensional structure of the three-jaw chuck in a clamping device for machining slender shafts by a numerically controlled cyclone milling machine proposed by the present invention.

[0020] In the figure: 1, machine tool body; 2, slender shaft workpiece; 3, three-jaw chuck; 31, mounting seat; 4, clamping unit; 41, tailstock; 42, inner sliding sleeve; 43, spring collet seat; 44, spring collet; 45, driving part; 46, support seat; 5, inflatable cavity; 50, sealing block; 51, special-shaped disc; 52, semi-circular block; 53, sliding rod; 54, piston; 541, return spring; 55, connecting cylinder; 56, air delivery pipe; 57, intake pipe a; 58, support frame; 61, intake pipe b; 62, shunt pipe; 63, air jet ring; 64, nozzle; 71, pressure reducing valve; 72, branch pipe; 8, moving seat; 81, slide rail; 9, L-shaped plate; 91, support block. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0022] In the description of the present invention, the term "a plurality of" refers to two or more, unless otherwise clearly defined. The orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. Terms such as "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, terms such as "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. can explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0023] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0024] Referring to Figures 1-8 , a clamping device for machining a slender shaft by a numerically controlled cyclone milling machine tool, comprising a machine tool body 1, a slender shaft workpiece 2 is arranged above the machine tool body 1, a rotatable three-jaw chuck 3 is arranged at one end of the slender shaft workpiece 2, the three-jaw chuck 3 is installed on a mounting seat 31, the mounting seat 31 is fixed on the bottom surface of the machine tool body 1, a clamping unit 4 for preventing the slender shaft workpiece 2 from deforming during machining is arranged at the other end of the slender shaft workpiece 2 at the top of the machine tool body 1, an air inflation cavity 5 arranged in the clamping unit 4, an air inlet at one end of which is communicated with the other end of the slender shaft workpiece 2; a sealing block 50, installed at the axial center of the clamping position on the three-jaw chuck 3, for limiting and blocking one end of the slender shaft workpiece 2; connecting cylinders 55, symmetrically arranged on both sides of the clamping unit 4, when the connecting cylinders 55 collect gas and transport it to the air inflation cavity 5 to inflate the inner cavity of the slender shaft workpiece 2, a part of the gas is shunted during the gas transportation of the connecting cylinders 55 to blow around the pre-machined surface of the right section of the slender shaft workpiece 2 to form a supporting force.

[0025] When this device is in use, first place the slender shaft workpiece 2 above the machine tool body 1. Clamp and fix one end of the slender shaft workpiece 2 through the set three-jaw chuck 3, and block one end of the slender shaft workpiece 2 with the sealing block 50. Then clamp and limit the other end of the slender shaft workpiece 2 through the clamping unit 4. When milling the surface of the slender shaft workpiece 2, the milling cutter head component is installed on the moving seat 8. At the same time, start the reduction motor (not shown in the figure) installed inside the mounting seat 31 to drive the three-jaw chuck 3 to rotate, thereby driving the slender shaft workpiece 2 to rotate. As the moving seat 8 moves horizontally left and right on the machine tool body 1, milling operation is performed on the surface of the slender shaft workpiece 2. Although in the prior art, the clamping unit 4 clamps and limits one end of the slender shaft workpiece 2, during the milling operation of the slender shaft workpiece 2, it can provide a pulling force to avoid deformation caused by applying an extrusion force to clamp and limit the slender shaft workpiece 2 in the traditional way, playing a certain protective role. However, due to the structure of the slender shaft workpiece 2 itself, with a small diameter and a long length, it is prone to vibration and deviation, resulting in poor machining accuracy, and seriously causing the machining of the slender shaft workpiece 2 to be scrapped. Therefore, in this solution, an air inflation cavity 5 is provided on the clamping unit 4. When the slender shaft workpiece 2 rotates, using the driving force generated by the rotation, the connecting cylinder 55 collects air flow and then transports it to the inner cavity of the slender shaft workpiece 2 for filling, increasing the structural strength of the slender shaft workpiece 2 during processing, thereby reducing the occurrence of deformation and damage. After the connecting cylinder 55 collects the air flow, a part of the air flow can be transported to the nozzle 64 and then ejected to form a stable supporting force, thus facilitating the increase of the supporting stability of the slender shaft workpiece 2 and reducing the vibration of the slender shaft workpiece 2 during processing. When the air pressure transported to the inner cavity of the slender shaft workpiece 2 reaches a certain value, it is discharged and then transported to the nozzle 64 to improve the strength of the air flow support at the slender shaft workpiece 2, so as to increase the supporting force of the slender shaft workpiece 2 when the slender shaft workpiece 2 is processed to the tail end.

[0026] In a preferred embodiment, referring to Figure 3 、 Figure 4 and Figure 5 the clamping unit 4 includes a support seat 46 fixed to the top of the machine tool body 1. A tailstock 41 is installed on the top of the support seat 46. An inner sliding sleeve 42 is slidably connected inside the tailstock 41. One end of the inner sliding sleeve 42 is rotatably connected to a spring collet holder 43 through a sealed bearing. A spring collet 44 is installed at one end of the spring collet holder 43. Air inflation cavities 5 are provided inside both the spring collet holder 43 and the inner sliding sleeve 42. The diameters of the two air inflation cavities 5 are the same. One end of the spring collet holder 43 is fixedly connected to the output end of the driving part 45. The driving part 45 is installed on one side surface of the tailstock 41.

[0027] Among them, the driving part 45 is replaced by a hydraulic rod drive. After the other end of the slender shaft workpiece 2 is clamped and fixed by the spring chuck 44, the other end of the slender shaft workpiece 2 is inserted into the inside of the spring chuck seat 43 and communicated with the inflatable cavity 5 inside the spring chuck seat 43. When the slender shaft workpiece 2 rotates during the processing, it drives the spring chuck seat 43 and the spring chuck 44 to rotate synchronously. In this way, while limiting the other end of the slender shaft workpiece 2, it does not affect the rotation of the slender shaft workpiece 2 during processing. After limiting the other end of the slender shaft workpiece 2, by starting the driving part 45, the inner sliding sleeve 42 is pulled to slide a small distance inside the tailstock 41, and then a pulling force is applied to one end of the slender shaft workpiece 2, thereby improving the anti-deformation effect of the slender shaft workpiece 2 during processing and avoiding the situation of jitter of the slender shaft workpiece 2 during processing.

[0028] In a preferred embodiment, referring to Figure 4 and Figure 7 , one end of the inflatable cavity 5 is fixed with an air delivery pipe 56, the end of the air delivery pipe 56 is communicated with one end of the connecting cylinder 55, one end of the connecting cylinder 55 is provided with an air inlet pipe a57, and one-way valves are arranged at the joints between the air inlet pipe a57 and the air delivery pipe 56 and the connecting cylinder 55. Driving parts are arranged on the two connecting cylinders 55. The driving parts include a sliding rod 53 slidably connected inside the connecting cylinder 55. One end of the sliding rod 53 is fixed with a piston 54 slidably connected to the inner wall of the connecting cylinder 55. The other end of the sliding rod 53 is fixed with a semi-circular block 52. The end of the semi-circular block 52 is attached to the special-shaped disk 51. The special-shaped disk 51 is fixed on the surface of the spring chuck seat 43. A return spring 541 is sleeved on the surface of the sliding rod 53. The two ends of the return spring 541 are respectively fixedly connected to the inner wall of the connecting cylinder 55 and the surface of the piston 54.

[0029] When the spring chuck seat 43 rotates, it drives the special-shaped disk 51 to rotate synchronously. The special-shaped disk 51 rotates and squeezes the semi-circular block 52, and then the piston 54 slides inside the connecting cylinder 55. In this way, the air inside the connecting cylinder 55 can be conveyed to the inside of the inflatable cavity 5 through the air delivery pipe 56, and then enter the cavity inside the slender shaft workpiece 2 to fill the inside of the slender shaft workpiece 2. Without changing the structure of the slender shaft workpiece 2 itself, the strength of the slender shaft workpiece 2 in the processing state can be improved. Since the internal inflation reduces the thermal deformation, the precision of the slender shaft thread processing can be improved. At the same time, the gas flow may also help to reduce vibration and further improve the processing quality. Under the elastic reset of the return spring 541, the external air can be extracted into the connecting cylinder 55 through the air inlet pipe a57.

[0030] It should be noted that since there are two connecting cylinders 55, when one of the connecting cylinders 55 extracts external air and concentrates it inside the connecting cylinder 55, the other connecting cylinder 55 exhausts air and conveys the gas to the inside of the inflation chamber 5 through the air delivery pipe 56. Moreover, when one of the two semi-circular blocks 52 is located at the raised part of the surface of the special-shaped disk 51, the other is located at the concave part of the surface of the special-shaped disk 51. In this way, it ensures the continuous delivery of gas flow at the slender shaft workpiece 2. And due to the setting of the one-way valve, the gas will not flow back. And the air pressure after delivery is set, and when it exceeds the set pressure value, pressure relief and exhaust treatment are carried out.

[0031] In a preferred embodiment, referring to Figure 4 and Figure 6 , the other end of the connecting cylinder 55 is provided with an air inlet pipe b61. The other end of the connecting cylinder 55 is communicated with a shunt pipe 62. A one-way valve is provided at the connection between the shunt pipe 62, the air inlet pipe b61 and the connecting cylinder 55. One end of the shunt pipe 62 is fixed with a jet ring 63. The jet ring 63 is sleeved on the surface of the slender shaft workpiece 2. The inner wall of the jet ring 63 is provided with spray nozzles 64 distributed at equal intervals. Both ends of the jet ring 63 are fixed with support frames 58. The support frames 58 are fixedly installed on the outer wall of the connecting cylinder 55. The other end of the support frame 58 is fixedly connected to the outer wall of the tailstock 41. A pressure reducing valve 71 is embedded on the surface of the spring collet seat 43. One end of the pressure reducing valve 71 extends to the inflation chamber 5. The other end of the pressure reducing valve 71 is fixed with a branch pipe 72. The branch pipe 72 is communicated with one of the shunt pipes 62. Symmetric slide rails 81 are provided on the top of the machine tool body 1. A moving seat 8 is slidably connected to the slide rails 81. An L-shaped plate 9 is fixedly installed on the surface of the moving seat 8 through bolts. A support block 91 is fixed on the surface of the L-shaped plate 9. The slender shaft workpiece 2 is slidably connected inside the L-shaped plate 9.

[0032] When the connecting cylinder 55 collects air flow, the piston 54 slides inside the connecting cylinder 55. At the same time, it collects external air through the air inlet pipe b61 and enters another part of the inner cavity of the connecting cylinder 55. Then it is conveyed to the jet ring 63 through the shunt pipe 62 and sprayed out through multiple spray nozzles 64 to form an air flow supporting force around the slender shaft workpiece 2. On the other hand, adopting this kind of structure, by the way of air flow blowing, it does not affect the rotational movement processing operation of the slender shaft workpiece 2. And the air flow blowing can improve the heat dissipation effect of the slender shaft workpiece 2 during processing and accelerate the heat conduction through the external cooling and temperature reduction method, effectively reducing the probability of thermal deformation. When the air pressure conveyed inside the slender shaft workpiece 2 exceeds the pressure value, one end of the pressure reducing valve 71 extends into the internal part of the inflation chamber 5 to install a pressure sensor to detect the air pressure intensity. The pressure sensor selects a commonly used model on the market. The air is exhausted through the pressure reducing valve 71 and then conveyed to one of the shunt pipes 62 through the branch pipe 72 and ejected through the nozzle 64 to increase the jet intensity of the nozzle 64. Since the slender shaft workpiece 2 is processed starting from the end close to the clamping unit 4 first and then displaced towards the end of the three-jaw chuck 3 during processing, when the nozzle 64 increases the air flow intensity for blowing, the milling process of the slender shaft workpiece 2 is away from the end of the clamping unit 4. Through the enhancement of the air flow of the nozzle 64, a more stable supporting force is provided, reducing the occurrence of vibration caused by the excessive length of the slender shaft workpiece 2; Among them, the support block 91 is sleeved on the surface of the slender shaft workpiece 2. When the milling component on the moving seat 8 mills the surface of the slender shaft workpiece 2, the slender shaft workpiece 2 can be limited and supported through the support block 91 to improve its stability.

[0033] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent replacements or changes should be covered within the protection scope of the present invention.

Claims

1. A clamping device for processing slender shafts on a numerically controlled cyclone milling machine tool, comprising a machine tool body (1). Above the machine tool body (1), there is a slender shaft workpiece (2). One end of the slender shaft workpiece (2) is provided with a rotatable three-jaw chuck (3). The three-jaw chuck (3) is installed on a mounting seat (31), and the mounting seat (31) is fixed on the bottom surface of the machine tool body (1). At the other end of the slender shaft workpiece (2) at the top of the machine tool body (1), there is a clamping unit (4) for preventing the slender shaft workpiece (2) from deforming during processing. It is characterized in that, An inflation chamber (5) provided inside the clamping unit (4), the air inlet at one end of which is communicated with the other end of the slender shaft workpiece (2); A sealing block (50), installed at the axis of the clamping position on the three-jaw chuck (3), for limiting and blocking one end of the slender shaft workpiece (2); Connecting cylinders (55), symmetrically arranged on both sides of the clamping unit (4). When the connecting cylinders (55) collect gas and transport it to the inflation chamber (5) to inflate the inner cavity of the slender shaft workpiece (2), a part of the gas is diverted during the gas transportation of the connecting cylinders (55) to blow air around the pre-processed surface of the right section of the slender shaft workpiece (2) to form a supporting force.

2. The clamping device for machining slender shafts by a numerically controlled cyclone milling machine tool according to claim 1, characterized in that, The clamping unit (4) includes a support seat (46) fixed on the top of the machine tool body (1). A tailstock (41) is installed on the top of the support seat (46). An inner sliding sleeve (42) is slidably connected inside the tailstock (41). One end of the inner sliding sleeve (42) is rotatably connected to a spring collet holder (43) through a sealed bearing. One end of the spring collet holder (43) is provided with a spring collet (44).

3. The clamping device for machining slender shafts by a numerically controlled cyclone milling machine tool according to claim 2, characterized in that, Inflation chambers (5) are both opened inside the spring collet holder (43) and the inner sliding sleeve (42). The diameters of the two inflation chambers (5) are the same. One end of the spring collet holder (43) is fixedly connected to the output end of a driving part (45), and the driving part (45) is installed on one side surface of the tailstock (41).

4. A clamping device for machining slender shafts by a numerically controlled cyclone milling machine according to claim 1, characterized in that, One end of the inflation chamber (5) is fixed with an air delivery pipe (56). The end of the air delivery pipe (56) is communicated with one end of the connecting cylinder (55). An air inlet pipe a (57) is provided at one end of the connecting cylinder (55). One-way valves are provided at the joints between the air inlet pipe a (57) and the air delivery pipe (56) and the connecting cylinder (55). Driving parts are provided on the two connecting cylinders (55).

5. A clamping device for machining slender shafts by a numerically controlled whirling milling machine tool according to claim 4, characterized in that, The driving part includes a sliding rod (53) slidably connected inside the connecting cylinder (55). One end of the sliding rod (53) is fixed with a piston (54) slidably connected to the inner wall of the connecting cylinder (55). The other end of the sliding rod (53) is fixed with a semi-circular block (52). The end of the semi-circular block (52) is fitted with a special-shaped disc (51). The special-shaped disc (51) is fixed on the surface of the spring collet holder (43). A return spring (541) is sleeved on the surface of the sliding rod (53). The two ends of the return spring (541) are respectively fixedly connected to the inner wall of the connecting cylinder (55) and the surface of the piston (54).

6. A clamping device for machining a slender shaft by a numerically controlled whirling milling machine tool according to claim 5, characterized in that, The other end of the connecting cylinder (55) is provided with an air inlet pipe b (61). The other end of the connecting cylinder (55) is communicated with a shunt pipe (62). A check valve is arranged at the connection between the shunt pipe (62), the air inlet pipe b (61) and the connecting cylinder (55). One end of the shunt pipe (62) is fixed with a jet ring (63). The jet ring (63) is sleeved on the surface of the slender shaft workpiece (2). The inner wall of the jet ring (63) is provided with nozzles (64) distributed at equal intervals.

7. A clamping device for machining slender shafts by a numerically controlled cyclone milling machine according to claim 6, characterized in that, Both ends of the jet ring (63) are fixed with support frames (58). The support frames (58) are fixedly installed on the outer wall of the connecting cylinder (55). The other end of the support frames (58) is fixedly connected to the outer wall of the tailstock (41).

8. A clamping device for machining a slender shaft by a numerically controlled whirling milling machine tool according to claim 2, characterized in that, A pressure reducing valve (71) is embedded on the surface of the spring clip seat (43). One end of the pressure reducing valve (71) extends to the inflation chamber (5). The other end of the pressure reducing valve (71) is fixed with a branch pipe (72). The branch pipe (72) is communicated with one of the shunt pipes (62).

9. The clamping device for machining slender shafts by a numerically controlled cyclone milling machine according to claim 1, characterized in that, Symmetric slide rails (81) are arranged on the top of the machine tool body (1). A moving seat (8) is slidably connected to the slide rails (81).

10. A clamping device for machining a slender shaft by a numerically controlled whirling milling machine tool according to claim 9, characterized in that, An L-shaped plate (9) is fixedly installed on the surface of the moving seat (8) by bolts. A support block (91) is fixed on the surface of the L-shaped plate (9). The slender shaft workpiece (2) is slidably connected in the L-shaped plate (9).

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