A spinning forming device for CNC machine tools

Abstract

The invention relates to the technical field of machining and manufacturing of mechanical parts, and specifically proposes a spin forming device for a CNC machine tool; the device comprises a fixed frame fixed in the machine tool, an axial frame is slidably mounted on the fixed frame along the main axis direction of the CNC machine tool, and a radial feeding mechanism and an auxiliary feeding mechanism are mounted on the axial frame; the invention can provide automatic pushing and unloading and improve machining positioning accuracy during the spinning process, and at the same time, comprehensively improve the quality and accuracy of the spin forming of the workpiece by balancing the spinning force, synchronous surface cleaning and synchronous spinning cooling, greatly reduce the possibility of various molding quality defects such as shape deviation, uneven wall thickness, rough and uneven surface, and surface oxidation, and improve the machining quality.

Description

Technical Field

[0001] The invention relates to the technical field of machining and manufacturing mechanical parts, and specifically proposes a spin forming device for a numerically controlled machine tool. Background Art

[0002] Spin forming is a forming process, which is mostly used in metal forming. During the process, the metal material is rotated to obtain processing force points from point to line and from line to surface. At the same time, pressure is applied in a certain direction to make the metal material deform and flow along this direction to produce plastic deformation. In actual processing, the spinning process is carried out by a spinning wheel or together with the corresponding spinning mold. For metal parts with simple axisymmetric structures such as cylinders and cones, generally no mold is required. The desired shape can be pressed only by moving the spinning wheel along the surface of the metal part.

[0003] When processing certain spin-formed parts, it is necessary to ensure the processing accuracy and surface forming quality of metal parts. Under the existing technology, in order to improve the processing accuracy and processing efficiency, they are generally processed and manufactured by CNC machine tools dedicated to spin forming. However, in the actual processing process, there are still the following multiple factors that affect the final spin forming quality of metal parts, as described below: 1) In the existing equipment, most of them use a single spinning wheel for feeding spin forming, and the single spinning wheel applies force at a single point and on one side. The force on the workpiece being processed is unbalanced, and the processing stability is poor, which will affect the spinning quality of the workpiece. For example, the unbalanced force will cause the shape of the workpiece to deviate from the designed shape, and the surface of the workpiece is prone to indentations, ripples, and unevenness, which will aggravate the unevenness of the spinning extension thickness of the workpiece.

[0004] 2) When the processing workshop or the storage area of ​​the workpiece blanks is in a dusty environment, the surface of the workpiece blanks will be contaminated with oil, dust and other impurities. Before spinning, if the surface of the workpiece blanks is not cleaned or cleaned insufficiently, the contact friction between the surface of the workpiece and the spinning wheel will increase during the spinning process, which will cause indentations and uneven surface defects on the surface of the workpiece, and will also cause uneven surface and abnormal deformation of the workpiece.

[0005] 3) During the spinning process, the extrusion friction between the spinning wheel and the workpiece will generate a lot of heat. If the workpiece is not effectively cooled, it will cause quality defects such as surface oxidation and thermal deformation of the workpiece. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a spin forming device for a CNC machine tool, which is used to solve the problems mentioned in the above background technology.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a spin forming device for a CNC machine tool, comprising a fixed frame fixed in the machine tool, an axial frame is horizontally slidably installed on the fixed frame along the main axis direction of the CNC machine tool, and a radial feeding mechanism and an auxiliary feeding mechanism are installed on the axial frame.

[0008] The radial feeding mechanism includes a slewing bearing fixed on a sliding frame, wherein the central axis of the slewing bearing coincides with the center of the CNC machine tool spindle; a plurality of rotating wheel assemblies driven synchronously by the slewing bearing are distributed around the circumference of the central axis, and the rotating wheel assembly moves radially along the slewing bearing; the rotating wheel assembly includes a rotating wheel in spinning contact with the workpiece to be processed and a cleaning assembly for cleaning the surface wall of the workpiece to be processed, the rotating wheel is arranged to rotate horizontally, and the central axis of the rotating wheel is parallel to the central axis of the slewing bearing; the cleaning assembly is closer to the auxiliary feeding mechanism than the rotating wheel; when the slewing bearing rotates, the plurality of rotating wheel assemblies move synchronously in the radial direction of the slewing bearing.

[0009] The auxiliary feeding mechanism includes a pushing component that pushes along the sliding direction of the sliding frame, a flip motor is horizontally fixed to the moving end of the pushing component, an electric chuck for internally supporting and clamping the workpiece is fixed on the output shaft of the flip motor, and the flip motor drives the electric chuck to flip and convert between three position states: vertical upward, horizontal, and vertical downward, and when the electric chuck is in a horizontal state, the center axis of the electric chuck coincides with the center axis of the slewing bearing.

[0010] Preferably, a plurality of radial guide frames corresponding to a plurality of rotating wheel assemblies are fixed on the fixed ring of the slewing bearing; the rotating wheel assembly also includes a rotating wheel frame slidably mounted on the corresponding radial guide frames, a lead screw is threadedly connected on the rotating wheel frame, the lead screw is rotatably mounted on the radial guide frame, and the rotating wheel is rotatably mounted on the rotating wheel frame; a bevel gear ring is fixed on the moving ring of the slewing bearing, a bevel gear meshing with the bevel gear ring is fixed on the lead screw; the cleaning assembly is mounted on the rotating wheel frame.

[0011] Preferably, the radial guide frame is equipped with a limit frame for limiting the moving distance of adjacent cleaning components; when the cleaning component and the rotating wheel are synchronously spun and fed with the rotating wheel frame, and the cleaning component moves to the position limited by the limit frame, the cleaning component is fixed in the radial direction of the slewing bearing.

[0012] Preferably, the cleaning assembly includes a roller frame installed on a rotating wheel frame along the radial sliding manner of the slewing bearing, the roller frame is closer to the center position of the slewing bearing than the rotating wheel frame, and at least one tension spring is connected between the roller frame and the rotating wheel frame; a cleaning roller is installed on the roller frame for horizontal rotation; the limit frame includes a slide plate installed on a radial guide frame for radial sliding adjustment along the slewing bearing and a limit plate fixed relatively vertically on the slide plate, the limit plate is located on a side of the corresponding roller frame close to the center of the slewing bearing; when the roller frame contacts the limit plate during the movement of the slewing wheel frame toward the center of the slewing bearing, the position of the cleaning roller in the radial direction of the slewing bearing is fixed.

[0013] Preferably, the electric chuck is provided with a plurality of inner support rods with a square vertical cross section, the inner support rods are hollow structures, and a plurality of air holes communicating with the inner cavity of the inner support rods are provided on the end surfaces of the inner support rods facing away from the center of the electric chuck.

[0014] Preferably, the fixed frame includes a fixed seat fixed in the machine tool, and two parallel guide sleeves are horizontally fixed on the fixed seat; the axial frame includes two sliding beams slidably installed in the two guide sleeves in a one-to-one correspondence, and a serial frame is fixed between the two sliding beams at one end; the slewing bearing is fixed at the other end of the two sliding beams; and the pushing assembly is assembled on the serial frame.

[0015] Preferably, the pushing assembly includes a travel plate slidably mounted on the serial frame along the sliding direction of the sliding frame, and the flip motor is fixed on the travel frame.

[0016] Preferably, the serial frame includes two side plates fixed one-to-one on two sliding beams and a connecting plate fixed between the two side plates, both side plates are provided with sliding rails, and the travel plate is fixed with two sliding bars slidably mounted one-to-one on the two sliding rails.

[0017] Preferably, a driven gear ring is fixed on the moving ring of the slewing bearing.

[0018] Preferably, a plurality of guide rods slidably mounted on the rotating wheel frame are fixed on the roller frame.

[0019] The above technical scheme has the following advantages or beneficial effects: the present invention provides a spin forming device for CNC machine tools, which can be installed in an existing spin forming CNC machine tool and is used for spin forming of metal workpieces with axially symmetrical structures; the device is provided with a plurality of spinning wheels which are distributed circumferentially around the main shaft of the CNC machine tool and can be synchronously radially fed, so as to ensure the balance and stability of the force of the workpiece during spin forming, and each spinning wheel is correspondingly installed with a cleaning component, which can synchronously and pre-complete the comprehensive and automatic cleaning of the surface of the workpiece by means of the spin forming displacement and the rotation of the workpiece driven by the main shaft, so as to avoid the influence of impurities attached to the surface of the workpiece on the forming process; in addition, it is also equipped with an auxiliary feeding mechanism, which is used to complete the end of the workpiece The alignment grabbing, the pushing feeding relative to the main axis and the unloading operation after spin forming improve the processing efficiency while ensuring the positioning accuracy of the workpiece in the axial and radial directions. An air cooling structure is provided on the inner support rod of the electric chuck, which can realize air cooling synchronously with the spin forming process after extending into the inner cavity of the workpiece. In summary, the present invention can provide automatic pushing and loading, automatic unloading and improve the processing positioning accuracy during the spinning process, while comprehensively improving the quality and accuracy of the spin forming of the workpiece through various methods such as balanced spinning force, synchronous surface cleaning and synchronous spinning cooling, greatly reducing the possibility of various forming quality defects such as shape deviation, uneven wall thickness, rough and uneven surface, and surface oxidation, thereby improving the processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention and its features, configurations and advantages will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings. The same reference numerals indicate the same parts throughout the drawings, which are not drawn to scale, with emphasis on illustrating the subject matter of the present invention.

[0021] Figure 1 The present invention is a schematic diagram of the three-dimensional structure of a spin forming device for a CNC machine tool.

[0022] Figure 2 The present invention is a top view of a spin forming device for a CNC machine tool.

[0023] Figure 3 It is a front view of a spin forming device for a CNC machine tool provided by the present invention.

[0024] Figure 4 It is a three-dimensional structural diagram of the assembly of the rotary wheel assembly and the radial guide frame.

[0025] Figure 5 yes Figure 4 A three-dimensional schematic diagram of the assembly structure shown in another viewing angle.

[0026] Figure 6 It is a three-dimensional structural diagram of the auxiliary feeding mechanism assembled on the serial frame.

[0027] Figure 7 It is a structural schematic diagram of a workpiece after spin forming.

[0028] In the figure: 1, fixed frame; 11, fixed seat; 12, guide sleeve; 2, axial frame; 21, sliding beam; 22, serial frame; 221, side plate; 222, connecting plate; 223, slide rail; 3, radial feed mechanism; 31, rotary bearing; 311, driven gear ring; 312, bevel gear ring; 32, radial guide frame; 33, limit frame; 331, slide plate; 332, limit plate; 4, rotary wheel assembly; 41. Rotary wheel frame; 42. Rotary wheel; 43. Lead screw; 431. Bevel gear; 44. Cleaning assembly; 441. Roller frame; 442. Guide rod; 443. Tension spring; 444. Cleaning roller; 5. Auxiliary feeding mechanism; 51. Pushing assembly; 511. Electric hydraulic cylinder; 512. Stroke plate; 513. Sliding bar; 52. Flip motor; 53. Electric chuck; 531. Inner support rod; 6. Processing workpiece. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] The present invention provides a spinning forming device for a CNC machine tool, such as Figure 7 The workpiece 6 shown is a metal part that can be spin-formed by the device provided by the present invention. The workpiece 6 shown in the figure is an axisymmetric cylindrical structure, which is divided into two cylindrical sections with different radii, wherein the small radius cylindrical section is obtained by spin forming, and the small radius cylindrical section and the large radius cylindrical section are transitioned by a spin-formed cone section, and the small radius cylindrical section and the cone section are collectively referred to as a spin-formed section.

[0032] like Figure 1 , Figure 2 and Figure 6As shown, a spin forming device for a CNC machine tool comprises a fixed frame 1, the fixed frame 1 comprises a fixed seat 11 fixed in the machine tool by bolts, the position of the fixed seat 11 is fixed, and two parallel guide sleeves 12 are horizontally welded on the fixed seat 11; and the guide sleeve 12 is arranged parallel to the main axis direction of the CNC machine tool. An axial frame 2 is assembled on the fixed frame 1, and the axial frame 2 comprises two sliding beams 21 slidably mounted in two guide sleeves 12 in a one-to-one correspondence, and a serial frame 22 is fixed between the ends of the two sliding beams 21 that are close to each other; the serial frame 22 comprises two side plates 221 welded in a one-to-one correspondence on the two sliding beams 21 and a connecting plate 222 welded between the two side plates 221. In this embodiment, the connecting plate 222 is fixed to a movable shaft that moves relative to the main axis in the CNC machine tool, thereby driving the axial frame 2 to move relative to the main axis direction through the CNC machine tool.

[0033] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 7 As shown, a radial feed mechanism 3 is mounted on the axial frame 2; the radial feed mechanism 3 includes a slewing bearing 31 whose central axis coincides with the center of the CNC machine tool spindle, and the fixed ring of the slewing bearing 31 is welded between the ends of the two sliding beams 21 away from the serial frame 22; three radial guide frames 32 are uniformly welded on the fixed ring of the slewing bearing 31 and around the circumference of its central axis, and a rotating wheel assembly 4 is correspondingly mounted on the three radial guide frames 32; the rotating wheel assembly 4 includes a rotating wheel frame 41 slidably mounted on the corresponding radial guide frame 32, and under the guidance of the radial guide frame 32, the rotating wheel frame 41 slides radially along the slewing bearing 31; a lead screw 43 is threadedly connected to the rotating wheel frame 41, and the lead screw 43 is threadedly connected to the lead screw 43. The lever 43 is rotatably mounted on the radial guide frame 32, and a rotating wheel 42 that is in spinning contact with the workpiece 6 is horizontally rotatably mounted on the rotating wheel frame 41, and the central axis of the rotating wheel 42 is parallel to the central axis of the slewing bearing 31; a bevel gear ring 312 is fixed to the moving circle of the slewing bearing 31, and a bevel gear 431 that meshes with the bevel gear ring 312 is fixed to the lead screw 43; a driven gear ring 311 is also fixed to the moving circle of the slewing bearing 31; in this embodiment, a stepper motor can be fixedly mounted between the two sliding beams 21, and a gear that meshes with the driven gear ring 311 is fixedly mounted on the output shaft of the stepper motor, thereby driving the slewing bearing 31 to rotate. The stepper motor is not shown in the accompanying drawings. When the stepper motor is started, the gear will drive the slewing bearing 31 to rotate through the driven gear ring 311, and the bevel gear ring 312 will drive the bevel gear 431 to drive the lead screw 43 to rotate, and the lead screw 43 will drive the rotating wheel frame 41 to slide along the radial guide frame 32, thereby driving the rotating wheel 42 to feed radially along the slewing bearing 31.

[0034] like Figure 4 , Figure 5 and Figure 7As shown, a cleaning assembly 44 for cleaning the surface of the workpiece 6 is mounted on the rotating wheel frame 41, and the cleaning assembly 44 is farther away from the spindle end of the CNC machine tool than the rotating wheel 42; the cleaning assembly 44 includes a roller frame 441, on which two guide rods 442 are welded to slide with the rotating wheel frame 41, and the guide rods 442 are axially arranged parallel to the radial direction of the slewing bearing 31, and a tension spring 443 is sleeved on the guide rods 442, and the two ends of the tension spring 443 are respectively welded to the rotating wheel frame 41 and the roller frame 441, and a cleaning roller 444 is horizontally rotatably mounted on the end of the roller frame 441 that is away from the guide rods 442, and the rotation axis direction of the cleaning roller 444 is arranged parallel to the central axis of the slewing bearing 31; the roller brush part of the cleaning roller 444 is made of nylon bristles. The structure is as follows: when the rotary wheel 42 moves with the rotary wheel frame 41, the cleaning assembly 44 moves synchronously with the rotary wheel frame 41, and a limit frame 33 is installed on the radial guide frame 32 to limit the moving distance of the adjacent cleaning assembly 44; the limit frame 33 includes a slide plate 331 and a limit plate 332 relatively vertically welded on the slide plate 331, and the limit plate 332 is located on the side of the corresponding roller frame 441 close to the center of the slewing bearing 31; the radial guide frame 32 is provided with a slide groove extending along the radial direction of the slewing bearing 31, and the slide plate 331 is slidably installed in the slide groove; during the movement of the rotary wheel frame 41 toward the center of the slewing bearing 31, when the roller frame 441 contacts the limit plate 332, the position of the cleaning roller 444 in the radial direction of the slewing bearing 31 is fixed. In order to facilitate the sliding adjustment and positioning of the slide plate 331, in this embodiment, a waist-shaped hole for the fixing bolt to pass through is provided on the slide plate 331, and the fixing bolt is loosened, and the limiting position of the limit plate 332 is adjusted by adjusting the position of the slide plate 331.

[0035] like Figure 1 , Figure 2 and Figure 6As shown, the auxiliary feeding mechanism 5 is mounted on the serial frame 22; the auxiliary feeding mechanism 5 includes a push assembly 51, which includes an electric hydraulic cylinder 511 horizontally fixed on the connecting plate 222 by bolts, a stroke plate 512 is fixed on the output end of the electric hydraulic cylinder 511, and two side plates 221 are welded with slide rails 223 extending along the axial moving direction of the frame 2, and two sliding bars 513 are welded on the stroke plate 512 and are slidably mounted on the two slide rails 223 in a one-to-one correspondence. A flip motor 52 is horizontally fixedly mounted on the stroke plate 512 through a motor fixing plate, and the output shaft of the flip motor 52 is vertically arranged relative to the sliding direction of the stroke plate 512; an electric chuck 53 for internally supporting and clamping the workpiece is fixed on the output shaft of the flip motor 52, and the flip motor 52 drives the electric chuck 53 to flip and switch between three positions of vertical upward, horizontal and vertical downward, and when the electric chuck 53 is in a horizontal state, the central axis of the electric chuck 53 coincides with the central axis of the slewing bearing 31. It should be noted that the flip motor 52 is an existing servo motor with an internally installed brake locking structure, and under the existing technology, the servo motor can achieve precise rotation in three angular directions of 0°, 90° and 180°, and the electric chuck 53 is an existing electric internal support clamping device; the electric chuck 53 is provided with three internal support rods 531 with a square vertical cross-section, the internal support rod 531 is a hollow structure, and is designed to be extended, and a plurality of air holes connected to the inner cavity of the internal support rod 531 are provided on the end face facing away from the center of the electric chuck 53, and the plurality of air holes are evenly distributed along the axial direction of the electric chuck 53, and cooling air is introduced into the internal support rod 531 from the outside through an air pipe and discharged from the air holes.

[0036] like Figure 1-Figure 7 As shown, the present invention provides a spin forming device for a CNC machine tool, which can be installed in an existing CNC machine tool dedicated to spin forming, and can be used for Figure 7 A type of axially symmetrical workpiece 6 shown is subjected to rapid spin forming, and the specific working process is as follows: first, the flip motor 52 is started and drives the electric chuck 53 to flip to a vertically upward position, then, the workpiece 6 can be placed on the disk of the electric chuck 53 manually or by a robot, and the disk is automatically aligned with the end of the workpiece 6. Then, the electric chuck 53 clamps the workpiece 6 through three inner support rods 531. In the inner support clamping state, the flip motor 52 drives the electric chuck 53 to flip to a horizontal state, so that the workpiece 6 is automatically aligned with the spindle of the CNC machine tool.

[0037] Next, the electric hydraulic cylinder 511 drives the stroke plate 512 to move toward the chuck end close to the spindle of the CNC machine tool, and then pushes the workpiece 6 into the spindle chuck of the CNC machine tool. At this time, the workpiece 6 is clamped by the inner support of the electric chuck 53 and aligned with the disk surface. The spindle chuck clamps the workpiece 6, ensuring the axial and radial positioning accuracy of the workpiece 6 after fixed clamping. Subsequently, the inner support rod 531 releases the clamping of the inner wall of the workpiece 6 to make way for the spinning feed process.

[0038] Subsequently, the stepper motor drives the rotary bearing 31 to rotate, and then drives the three rotating wheel assemblies 4 to approach the workpiece 6, so that the bristles of the cleaning roller 444 are effectively attached to the outer wall of the workpiece 6, and the rotating wheel 42 is in a position close to and tangent to the workpiece 6. It should be noted that at the starting position of the spinning process, the cleaning roller 444 is in contact with the large radius cylindrical section of the workpiece 6, thereby ensuring that the cleaning roller 444 is in full coverage contact with the spinning forming section of the processing target during the spinning process.

[0039] Next, spin forming is performed. It should be noted that in the existing processing process, in order to ensure the rationality of the spinning feed amount and the quality of the spinning forming, the rough spinning forming is generally performed first, and then the fine spinning forming is performed, that is, the spinning forming operation is divided into at least two times. Figure 2 As shown, according to the displacement and feed amounts pre-input into the CNC machine tool, on the one hand, driven by the CNC machine tool, the axial frame 2 drives the auxiliary feeding mechanism 5 together with the workpiece 6 to move away from the spindle chuck end to perform axial displacement; on the other hand, driven synchronously by the slewing bearing 31, the three rotating wheels 42 synchronously feed radially; under the axial uniform displacement, the rough spinning forming of the workpiece 6 is completed, and during the rough spinning forming process, the bristles of the cleaning roller 444 are kept in close contact with the surface of the workpiece 6, and the workpiece 6 rotates at a high speed driven by the rotation of the spindle chuck, and the cleaning roller 444 brushes and cleans the surface of the workpiece 6, thereby achieving circumferential cleaning. At the same time, during the axial movement, the cleaning roller 444 cleans the surface of the workpiece 6 in the axial direction, and then comprehensively completes the cleaning of the entire spinning section surface of the workpiece 6. Combined with Figure 5 , Figure 1The middle cleaning roller 444 is located to the left of the rotary wheel 42. Therefore, in summary, after the surface cleaning is completed, the rotary wheel 42 is in contact with the surface of the workpiece 6 for spinning; with the help of synchronous cleaning during the spinning displacement process, the cleanliness of the surface of the workpiece 6 is ensured, and the quality of the workpiece 6 spin-formed due to the surface of the workpiece 6 not being cleaned or not being effectively cleaned is avoided. In addition, during the spinning process, the inner support rod 531 is kept continuously supplied with cooling air, and the inner support rod 531 is synchronously displaced in the cavity of the workpiece 6 with the spinning process, and cooling air is continuously introduced into the tube of the workpiece 6, thereby synchronously cooling the workpiece 6; during the spinning process, the spinning forming process is performed through three circumferentially evenly distributed rotary wheels 42, which avoids single-point unilateral force, can form a balanced force focused on the center of the spindle, and effectively reduces the various forming quality defects of the workpiece 6 caused by unbalanced force.

[0040] Subsequently, the axial frame 2 is reset to perform another spin forming operation. When the spin forming operation is performed again, the radial feed amount is increased, and the cleaning roller 444 has completed the cleaning of the surface of the processed workpiece 6 during a round of rough spin forming, and there is no need to clean it again. Therefore, when the cleaning component 44 and the rotating wheel 42 are further displaced with the rotating wheel frame 41, the roller frame 441 moves to a position in contact with the limit plate 332, and then the cleaning roller 444 is fixed in the radial direction of the slewing bearing 31. At this time, the bristles of the cleaning roller 444 are basically in a separated state from the surface of the rough spin forming section, avoiding further extrusion contact between the bristles of the cleaning roller 444 and the surface of the processed workpiece 6. Because when the taper of the cone section of the processed workpiece 6 is large, if the bristles of the cleaning roller 444 further contact the surface of the processed workpiece 6, the bristles will be severely extruded and deformed, and will also accelerate wear, affecting the subsequent normal cleaning use.

[0041] When the workpiece 6 has completed multiple spin forming operations and reached the designed shape, the spin forming operation is completed. Subsequently, the axial frame 2 and the rotary wheel assembly 4 are reset, and the inner support rod 531 further extends into the cavity of the workpiece 6. When the inner support rod 531 completes the inner support clamping again, the spindle chuck is released, and the electric hydraulic cylinder 511 is started again, and the workpiece 6 is driven to move out from the spindle chuck end through the electric chuck 53. Then, the flip motor 52 drives the electric chuck 53 to flip to a vertical downward state and releases the clamping, so that the formed workpiece 6 automatically completes unloading.

[0042] The present invention provides a spin forming device for a CNC machine tool, which can be installed in an existing spin forming CNC machine tool for spin forming, and is used for spin forming a metal workpiece 6 with an axially symmetrical structure; the device is provided with a plurality of spinning wheels 42 which are circumferentially distributed around the main axis of the CNC machine tool and can be synchronously radially fed, so as to ensure the balance and stability of the spin forming force of the workpiece 6, and each spinning wheel 42 is correspondingly installed with a cleaning component 44, which can synchronously and pre-complete the comprehensive and automatic cleaning of the surface of the workpiece 6 by means of the spin forming displacement and the spindle driving the workpiece 6 to rotate, so as to avoid the impurities attached to the surface of the workpiece 6 from affecting the forming process; in addition, it is also equipped with an auxiliary feeding mechanism 5, which uses the auxiliary feeding mechanism 5 to complete the end alignment, grasping, and relative The pushing and feeding of the main shaft and the unloading operation after spin forming improve the processing efficiency while ensuring the positioning accuracy of the workpiece 6 in the axial and radial directions. A wind cooling structure is provided on the inner support rod 531 located on the electric chuck 53, which can realize wind cooling synchronously with the spin forming process after extending into the inner cavity of the workpiece 6. In summary, the present invention can provide automatic pushing and feeding, automatic unloading and improve the processing positioning accuracy during the spinning process, while comprehensively improving the quality and accuracy of the spin forming of the workpiece 6 through various methods such as balanced spinning force, synchronous surface cleaning and synchronous spinning cooling, greatly reducing the possibility of various forming quality defects such as shape deviation, uneven wall thickness, rough and uneven surface, and surface oxidation, thereby improving the processing quality.

[0043] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0044] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0045] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can make many possible changes and modifications without departing from the technical solution of the present invention, or modify them into equivalent embodiments with equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. A spin forming device for a CNC machine tool, comprising a fixed frame (1) fixed in the machine tool, characterized in that: An axial frame (2) is horizontally slidably mounted on the fixed frame (1) along the direction of the CNC machine tool spindle, and a radial feeding mechanism (3) and an auxiliary feeding mechanism (5) are mounted on the axial frame (2); wherein: The radial feeding mechanism (3) comprises a slewing bearing (31) fixed on the axial frame (2), wherein the central axis of the slewing bearing (31) coincides with the center of the CNC machine tool spindle; a plurality of rotary wheel assemblies (4) are distributed around the circumference of the central axis of the slewing bearing (31) and are synchronously driven by the slewing bearing (31), wherein the rotary wheel assembly (4) moves in the radial direction of the slewing bearing (31); the rotary wheel assembly (4) comprises a rotary wheel (42) in spin-pressing contact with the workpiece (6) and a cleaning assembly (44) for cleaning the surface of the workpiece (6), wherein the rotary wheel (42) is arranged to rotate horizontally, and the central axis of the rotary wheel (42) is parallel to the central axis of the slewing bearing (31); the cleaning assembly (44) is closer to the auxiliary feeding mechanism (5) than the rotary wheel (42); when the slewing bearing (31) rotates, the plurality of rotary wheel assemblies (4) move synchronously in the radial direction of the slewing bearing (31); The auxiliary feeding mechanism (5) comprises a pushing component (51) that pushes along the sliding direction of the axial frame (2); a flip motor (52) is horizontally fixed to the moving end of the pushing component (51); an electric chuck (53) for internally clamping the workpiece is fixed to the output shaft of the flip motor (52); the flip motor (52) drives the electric chuck (53) to flip and switch between three position states: vertically upward, horizontal, and vertically downward; and when the electric chuck (53) is in a horizontal state, the central axis of the electric chuck (53) coincides with the central axis of the slewing bearing (31); A plurality of radial guide frames (32) arranged one-to-one corresponding to a plurality of rotating wheel assemblies (4) are fixed on the fixed ring of the slewing bearing (31); the rotating wheel assembly (4) further comprises a rotating wheel frame (41) slidably mounted on the corresponding radial guide frame (32); a lead screw (43) is threadedly connected to the rotating wheel frame (41); the lead screw (43) is rotatably mounted on the radial guide frame (32); and the rotating wheel (42) is rotatably mounted on the rotating wheel frame (41); a bevel gear ring (312) is fixed on the moving ring of the slewing bearing (31); a bevel gear (431) meshing with the bevel gear ring (312) is fixed on the lead screw (43); and the cleaning assembly (44) is mounted on the rotating wheel frame (41); The radial guide frame (32) is equipped with a limit frame (33) for limiting the moving distance of adjacent cleaning assemblies (44); when the cleaning assembly (44) and the rotating wheel (42) are synchronously spun and fed along with the rotating wheel frame (41), and the cleaning assembly (44) moves to a position limited by the limit frame (33), the cleaning assembly (44) is fixed in a radial direction of the slewing bearing (31); The cleaning assembly (44) comprises a roller frame (441) which is mounted on the rotating wheel frame (41) in a radially sliding manner along the slewing bearing (31); the roller frame (441) is closer to the center of the slewing bearing (31) than the rotating wheel frame (41); at least one tension spring (443) is connected between the roller frame (441) and the rotating wheel frame (41); a cleaning roller (444) is mounted on the roller frame (441) for horizontal rotation; the limiting frame (33) comprises a roller frame (444) which is mounted on the slewing bearing (31) in a radially sliding manner; and a roller frame (444) which is mounted on the slewing bearing (31) in a radially sliding manner. A slide plate (331) mounted on a radial guide frame (32) and a limit plate (332) fixed vertically to the slide plate (331) are slidably adjusted, and the limit plate (332) is located on a side of the corresponding roller frame (441) close to the center of the slewing bearing (31); when the roller frame (441) contacts the limit plate (332) during the movement of the rotating wheel frame (41) toward the center of the slewing bearing (31), the cleaning roller (444) is fixed in position in the radial direction of the slewing bearing (31).

2. The spin forming device for a CNC machine tool according to claim 1, characterized in that: The electric chuck (53) is provided with a plurality of inner support rods (531) with a square vertical cross section. The inner support rods (531) are hollow structures, and a plurality of air holes communicating with the inner cavity of the inner support rods (531) are provided on the end surface of the inner support rods (531) facing away from the center of the electric chuck (53).

3. The spin forming device for a CNC machine tool according to claim 1, characterized in that: The fixed frame (1) comprises a fixed seat (11) fixed in the machine tool, and two parallel guide sleeves (12) are horizontally fixed on the fixed seat (11); the axial frame (2) comprises two sliding beams (21) slidably mounted in the two guide sleeves (12) in a one-to-one correspondence, and a series frame (22) is fixed between the ends of the two sliding beams (21) that are close to each other; the slewing bearing (31) is fixed on the other ends of the two sliding beams (21); and the pushing assembly (51) is assembled on the series frame (22).

4. The spin forming device for a CNC machine tool according to claim 3, characterized in that: The pushing assembly (51) comprises a travel plate (512) mounted on the serial frame (22) in a sliding manner along the axial sliding direction of the frame (2), and the turning motor (52) is fixed on the travel frame.

5. The spin forming device for a CNC machine tool according to claim 4, characterized in that: The serial frame (22) comprises two side plates (221) fixed on the two sliding beams (21) in a one-to-one correspondence and a connecting plate (222) fixed between the two side plates (221), the two side plates (221) are each provided with a sliding rail (223), and the travel plate (512) is fixed with two sliding bars (513) slidably mounted on the two sliding rails (223) in a one-to-one correspondence.

6. The spin forming device for a CNC machine tool according to claim 1, characterized in that: A driven gear ring (311) is fixed on the moving ring of the slewing bearing (31).

7. The spin forming device for a CNC machine tool according to claim 1, characterized in that: A plurality of guide rods (442) slidably mounted on the rotating wheel frame (41) are fixed on the roller frame (441).

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