A machining center and a machining method for threaded parts

Abstract

The present invention relates to the field of thread processing technology, and specifically to a processing center and processing method for threaded parts processing, comprising: an outer shell, a workbench is arranged at the bottom of the inner cavity of the outer shell, and a tool seat is fixedly connected to the lower end of the processing spindle; a circulation groove is opened at the lower end of the tool seat, and a coolant delivery pipe is arranged at the upper part of the inner cavity of the tool seat; an annular bushing is installed in the inner cavity of the circulation groove, the annular bushing is hollow in structure, and the upper and lower upper end openings are both outward-flashed trumpet-shaped, and an annular porous plate is arranged at the upper end of the annular bushing; the beneficial effect is: by opening a circulation groove at the lower end of the tool seat, an annular bushing is installed in the inner cavity of the circulation groove, the annular bushing is hollow in structure, and the upper and lower ends are both outward-flashed trumpet-shaped, when the tool seat rotates and the workpiece body is milled by the milling cutter, the coolant in the countersunk threaded hole drives the debris to flow from bottom to bottom along the inner cavity of the annular bushing, thereby reducing the debris in the countersunk threaded hole.

Description

Technical Field

[0001] The invention relates to the technical field of thread processing, in particular to a processing center and a processing method for threaded parts processing. Background Art

[0002] The machining center is a high-efficiency, high-precision CNC machine tool that can complete multiple processing steps in one clamping of the workpiece. It also has a tool library and automatic tool changing function.

[0003] A Chinese utility model with publication number CN219292928U discloses a tool for milling internal threads in a machining center. By starting a first electric push rod to push an arc-shaped fixing clamp toward the middle, it is convenient to clamp and fix parts that require internal tapping to avoid deviation of parts during tapping.

[0004] At present, some workpieces need to be processed with countersunk threaded holes. During the milling process, the milling debris cannot be discharged in time, remains in the countersunk threaded hole, and adheres to the inner wall of the threaded hole. With the high-speed rotation of the tool and the movement of the tool in the threaded hole, the tool is easily affected by the milling debris during milling, resulting in poor milling forming effect of the threaded hole. To this end, the present invention proposes a machining center and a machining method for threaded parts machining to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a machining center and a machining method for threaded parts, so as to solve the problem in the background art that the milling debris in the countersunk threaded hole cannot be removed in time and affects the milling effect.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a machining center for processing threaded parts, comprising:

[0007] A shell, a workbench is arranged at the bottom of the inner cavity of the shell, a spindle box is arranged above the workbench, a workpiece body is placed on the surface of the workbench, a machining spindle is arranged inside the spindle box, a tool seat is fixedly connected to the lower end of the machining spindle, and the tool seat is located in the countersunk hole of the machining spindle;

[0008] A plurality of milling cutters distributed in a circular array are installed on the surface of the tool seat, a circulation groove is provided at the lower end of the tool seat, a coolant delivery pipe is provided at the upper part of the inner cavity of the tool seat, a coolant discharge hole connected to the coolant delivery pipe is provided at the upper part of the surface of the tool seat, and a coolant circulation hole connected to the circulation groove is provided at the lower part of the surface of the tool seat;

[0009] An annular bushing is installed in the inner cavity of the circulation groove. The annular bushing is a hollow structure, and the upper and lower upper openings are both outward-flashed trumpet-shaped. The inner cavity of the annular bushing is fixedly provided with spiral blades. The upper end of the annular bushing is provided with an annular porous plate, which fits the inner wall of the circulation groove and covers the coolant circulation holes. The inner wall of the upper end of the annular bushing is provided with a magnet sheet.

[0010] Preferably, the surface of the tool seat is provided with a plurality of T-slots distributed in a circular array, the length direction of the T-slots is consistent with the length direction of the tool seat, the plurality of milling cutters are respectively slidably inserted into the inner cavities of the plurality of T-slots and are fixedly connected to the T-slots by fixing bolts, the annular bushing is threadedly connected to the circulation groove, and the tightening direction of the annular bushing is consistent with the rotation direction of the tool seat.

[0011] Preferably, the coolant discharge holes are provided in a plurality of groups and are distributed at equal intervals along the length direction of the tool seat, each group of the coolant discharge holes is provided with a plurality of holes and are distributed in a circular array around the tool seat, and the surface of the coolant delivery pipe is provided with a plurality of arc-shaped grooves distributed at equal intervals along its length direction, the arc-shaped grooves correspond to the coolant discharge holes and the central angle of the arc-shaped grooves is sixty degrees.

[0012] Preferably, the machining spindle is a hollow structure, the upper end of the coolant delivery pipe passes through the inner cavity of the machining spindle and extends above the machining spindle, the coolant delivery pipe rotates inside the machining spindle and the tool seat, and a seal is provided between the coolant delivery pipe and the tool seat.

[0013] Preferably, a driving assembly is provided inside the spindle box, and the driving assembly includes a fixed shaft, a rotating frame is provided at the lower end of the fixed shaft, two ends of the rotating frame are respectively sleeved on the outside of the fixed shaft and the outside of the coolant delivery pipe, and one end of the rotating frame is fixed to the coolant delivery pipe, and a telescopic part that can adjust its own length is provided in the middle of the rotating frame, and the telescopic part is an electric push rod.

[0014] Preferably, an extension frame is fixed to one end of the rotating frame, a spindle drive gear is rotatably installed on one end of the extension frame, and the spindle drive gear is driven to rotate by a spindle drive motor, a spindle drive ring gear is fixed to the outer side of the upper end of the machining spindle, and the spindle drive ring gear is meshed with the spindle drive gear for transmission.

[0015] Preferably, an upper sealing disk and a lower sealing disk are rotatably arranged on the outer side of the middle part of the fixed shaft from top to bottom, the upper sealing disk and the lower sealing disk are spliced ​​with each other to form a hollow disc structure, and a sealing member is used to maintain a rotating seal between the two, an adjusting waist hole is penetrated through the lower surface of the lower sealing disk, the upper end of the coolant delivery pipe penetrates the adjusting waist hole and extends to the inner cavity of the lower sealing disk, and the surface of the coolant delivery pipe and the bottom wall of the lower sealing disk are kept sealed by a flexible sealing layer.

[0016] Preferably, a fixed beam is installed at the upper end of the fixed shaft, a main shaft moving gear is rotatably installed at the middle part of the fixed beam, and the main shaft moving gear is driven to rotate by a main shaft moving motor, an annular gear ring is fixedly provided on the outer wall of the lower sealing disk, and the annular gear ring is meshed with the main shaft moving gear for transmission, a positioning boss is fixedly provided on the upper surface of the upper sealing disk, and the positioning boss is fixed to the fixed beam by bolts, and a coolant inlet pipe is fixedly connected to the upper surface of the upper sealing disk.

[0017] Preferably, a three-jaw chuck is installed on the inner cavity side wall of the shell, a clamping tool for positioning the workpiece body is provided in the middle of the workbench, and the surface of the clamping tool is a porous structure, and a reflux groove for recovering coolant is provided below the workbench.

[0018] A processing method for a machining center for processing threaded parts according to the above-mentioned method specifically comprises the following steps:

[0019] Step 1: Place the workpiece on the workbench and position it, move the spindle box downward and extend the tool holder from top to bottom into the countersunk hole on the upper surface of the workpiece;

[0020] Step 2: Start the spindle drive motor to drive the machining spindle and the tool holder to rotate. At this time, the milling cutter mills the inner wall of the countersunk hole. At the same time, start the spindle moving motor to drive the lower sealing disk to rotate slowly. When the lower sealing disk rotates, it drives the rotating frame to rotate around the fixed axis, and then drives the tool holder to move in the inner cavity of the countersunk hole through the machining spindle, so as to realize milling of various positions of the inner wall of the countersunk hole;

[0021] Step 3: During the milling process, coolant is delivered to the inner cavity of the coolant delivery pipe through the coolant inlet pipe, and the coolant is ejected through the arc-shaped through groove and the coolant discharge hole, and sprayed on the inner wall of the countersunk hole, so as to cool the milling cutter in contact with the inner wall of the countersunk hole and flush the debris at the same time;

[0022] Step 4: During the rotation of the tool holder, the annular bushing rotates accordingly, and the spiral blade drives the coolant in the inner cavity of the countersunk hole to enter the inner cavity of the circulation groove from bottom to top. The coolant is discharged through the coolant circulation hole, and the debris in the coolant is filtered by the annular porous plate and adsorbed by the magnet sheet and retained in the inner cavity of the circulation groove.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention has a circulation groove at the lower end of the tool seat, and an annular bushing is installed in the inner cavity of the circulation groove. The annular bushing is hollow in structure, and both upper and lower ends are outward-flashed trumpet-shaped. A spiral blade is fixed in the inner cavity of the annular bushing. An annular porous plate is provided at the upper end of the annular bushing, and the annular porous plate fits the inner wall of the circulation groove. A coolant discharge hole is provided on the surface of the tool seat for flushing debris and cooling the milling cutter. A coolant circulation hole is provided on the surface of the tool seat and is connected with the inner cavity of the circulation groove. When the tool seat rotates and the workpiece body is milled by the milling cutter, the coolant in the countersunk threaded hole drives the debris to flow from bottom to bottom along the inner cavity of the annular bushing. The annular porous plate can separate metal debris from the coolant, and the metal debris is adsorbed by the magnet sheet, thereby reducing the debris in the countersunk threaded hole and preventing the debris from affecting the milling effect of the inner thread on the surface of the workpiece body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a three-dimensional schematic diagram of the tool holder and workpiece body structure of the present invention;

[0027] Figure 3 This is an exploded schematic diagram of the tool holder structure of the present invention;

[0028] Figure 4 A half-section schematic diagram of the tool holder structure of the present invention;

[0029] Figure 5 A half-section schematic diagram of the annular bushing structure of the present invention;

[0030] Figure 6 This is a schematic diagram of the interior of the tool holder structure of the present invention;

[0031] Figure 7 It is a three-dimensional schematic diagram of the drive assembly structure of the present invention;

[0032] Figure 8 This is a schematic diagram of the connection structure between the rotating frame and the coolant delivery pipe of the present invention;

[0033] Fig. 9 This is a three-dimensional schematic diagram of the lower sealing disk structure of the present invention;

[0034] Fig.10 It is a schematic diagram of the structural separation of the lower sealing disk and the upper sealing disk of the present invention.

[0035] In the figure: 1, housing; 101, three-jaw chuck; 2, workbench; 201, clamping fixture; 3, spindle box; 4, workpiece body; 5, machining spindle; 51, spindle drive gear ring; 6, tool seat; 61, T-slot; 62, milling cutter; 621, fixing bolt; 63, circulation groove; 64, coolant discharge hole; 65, coolant circulation hole; 7, drive assembly; 71, fixed shaft; 72, rotating frame; 721, telescopic member; 722, extension frame; 723, spindle Driving gear; 724, spindle driving motor; 73, upper sealing plate; 731, coolant inlet pipe; 732, positioning boss; 74, lower sealing plate; 741, annular gear ring; 742, sealing element; 743, adjusting waist hole; 75, fixed beam; 751, spindle moving gear; 752, spindle moving motor; 8, coolant delivery pipe; 81, arc-shaped through groove; 82, flexible sealing layer; 9, annular bushing; 91, spiral blade; 92, annular porous plate; 93, magnet sheet. DETAILED DESCRIPTION

[0036] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention, and are not used to limit 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.

[0037] In the description of the present invention, it should be noted that the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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 operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "one", "first", "second", "third", "fourth", "fifth", "sixth" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] For the purpose of simplicity and illustration, the principles of the embodiments are mainly described by reference to examples. In the following description, many specific details are proposed to provide a thorough understanding of the embodiments. However, it is obvious that for those of ordinary skill in the art, these embodiments may not be limited to these specific details in practice. In some instances, known methods and structures are not described in detail to avoid making these embodiments unnecessarily difficult to understand. In addition, all embodiments can be used in combination with each other.

[0040] See also Figures 1 to 10 , the present invention provides a technical solution:

[0041] Embodiment 1, a machining center for machining threaded parts, comprises: a housing 1 and an annular bushing 9.

[0042] Specifically, a workbench 2 is arranged at the bottom of the inner cavity of the shell 1, a spindle box 3 is arranged above the workbench 2, and the spindle box 3 can be adjusted in height in the up and down directions. A workpiece body 4 is placed on the surface of the workbench 2, and a machining spindle 5 is arranged inside the spindle box 3. A tool seat 6 is fixedly connected to the lower end of the machining spindle 5, and the tool seat 6 is located in the countersunk hole of the machining spindle 5. The machining spindle 5 can rotate inside the spindle box 3 and drive the tool seat 6 at the lower end to rotate, so that the inner wall of the countersunk hole of the workpiece body 4 can be milled;

[0043] Secondly, a plurality of milling cutters 62 are installed on the surface of the tool seat 6 in a circular array. When the tool seat 6 rotates at a high speed, as the tool seat 6 moves, the milling cutter 62 can process internal threads on the inner wall of the countersunk hole. A circulation groove 63 is provided at the lower end of the tool seat 6. A coolant delivery pipe 8 is provided at the upper part of the inner cavity of the tool seat 6. A coolant discharge hole 64 connected to the coolant delivery pipe 8 is provided on the upper part of the surface of the tool seat 6. The coolant delivery pipe 8 is used to deliver coolant and spray the coolant from the coolant discharge hole 64. When the milling cutter 62 performs milling processing, the temperature of the contact position between the milling cutter 62 and the workpiece body 4 is reduced. At the same time, the coolant can also flush the chips adhering to the inner wall of the countersunk hole, so that the milling chips can fall to the bottom of the countersunk hole as much as possible. The lower part of the surface of the tool seat 6 is provided with a coolant circulation hole 65 connected to the circulation groove 63. The coolant in the countersunk hole can enter the inner cavity of the circulation groove 63 from the lower end of the tool seat 6 from bottom to top, and be re-discharged into the countersunk hole from the coolant circulation hole 65, forming a circulating flow;

[0044] Furthermore, the annular bushing 9 is installed in the inner cavity of the circulation groove 63. The annular bushing 9 is a hollow structure, and the upper and lower upper openings are both outward-flashed trumpet-shaped. The inner cavity of the annular bushing 9 is fixedly provided with a spiral blade 91. The annular bushing 9 and the spiral blade 91 rotate synchronously with the rotation of the tool seat 6. When the spiral blade 91 rotates, it can drive the coolant in the countersunk hole to flow upward to the inner cavity of the circulation groove 63 and be discharged from the coolant circulation hole 65 to form a circulation flow. The lower end opening of the annular bushing 9 is trumpet-shaped to increase the absorption efficiency of the coolant, and the upper end of the annular bushing 9 is trumpet-shaped to prevent metal debris in the coolant from falling due to gravity. The upper end of the annular bushing 9 is provided with an annular porous plate 92, which fits the inner wall of the circulation groove 63 and covers the coolant circulation hole 65. The upper inner wall of the annular bushing 9 is provided with a magnet sheet 93. Figure 4 and Figure 5 It can be seen that the annular porous plate 92 can filter the metal debris in the coolant, retain the metal debris in the inner cavity of the circulation groove 63, and the magnet sheet 93 adsorbs the metal debris, thereby preventing the metal debris from returning to the countersunk hole and affecting the milling forming effect of the countersunk threaded hole.

[0045] In order to install the milling cutter 62 and the annular bushing 9, the present application also has a plurality of T-slots 61 distributed in an annular array on the surface of the tool seat 6, the length direction of the T-slot 61 is consistent with the length direction of the tool seat 6, and the plurality of milling cutters 62 are respectively slidably inserted into the inner cavities of the plurality of T-slots 61, and are fixedly connected to the T-slots 61 by fixing bolts 621, such as Figure 3 As shown, the cross section of the milling cutter 62 is T-shaped in accordance with the T-slot 61. After the milling cutter 62 is inserted into the inner cavity of the T-slot 61 from bottom to top, it is fastened by the fixing bolt 621 to ensure its own position stability. When the milling cutter 62 is milling, it will not easily shake or loosen. Secondly, the annular bushing 9 is connected to the circulation groove 63 by a thread, and the tightening direction of the annular bushing 9 is consistent with the rotation direction of the tool seat 6. Figure 5 and Figure 6 As shown, the annular bushing 9 is installed in the inner cavity of the circulation groove 63 by screwing, and during the rotation of the tool seat 6, the annular bushing 9 and the tool seat 6 can remain stable to prevent the annular bushing 9 from loosening and falling off. When the tool seat 6 stops rotating, the annular bushing 9 can be removed by screwing it in the reverse direction to facilitate cleaning of metal debris adsorbed by the magnet sheet 93.

[0046] In order to avoid waste of coolant, the coolant discharge holes 64 of the present application are provided with multiple groups and are evenly spaced along the length direction of the tool holder 6. Each group of coolant discharge holes 64 is provided with multiple and are distributed in a circular array around the tool holder 6. The surface of the coolant delivery pipe 8 is provided with multiple arc-shaped grooves 81 evenly spaced along its length direction. The arc-shaped grooves 81 correspond to the coolant discharge holes 64 and the central angle of the arc-shaped grooves 81 is sixty degrees. Figure 4 and Figure 6 It can be seen that only when the coolant discharge hole 64 corresponds to the arc-shaped through groove 81, the coolant discharge hole 64 can spray coolant, while the remaining coolant discharge holes 64 that do not correspond to the arc-shaped through groove 81 will not spray coolant. The arc-shaped through groove 81 of the present device is toward the position where the tool seat 6 and the inner wall of the countersunk hole meet. The advantage of such a design is that the coolant is only sprayed toward the milling position, thereby reducing the amount of coolant used, avoiding waste of resources, and ensuring that the milling position will not be adhered to by debris, thereby improving the milling forming quality of the internal thread.

[0047] In order to prevent the rotation of the tool seat 6 from affecting the coolant delivery pipe 8, the machining spindle 5 of the present application is a hollow structure, the upper end of the coolant delivery pipe 8 passes through the inner cavity of the machining spindle 5 and extends to the top of the machining spindle 5, the coolant delivery pipe 8 rotates inside the machining spindle 5 and the tool seat 6, and the coolant delivery pipe 8 and the tool seat 6 are sealed. In other words, the machining spindle 5 and the tool seat 6 can rotate freely without affecting the coolant delivery pipe 8, and when the tool seat 6 rotates, the tool seat 6 and the coolant delivery pipe 8 remain sealed to prevent the coolant in the inner cavity of the coolant delivery pipe 8 from leaking between the tool seat 6 and the coolant delivery pipe 8.

[0048] In order to drive the tool holder 6 to rotate and move, the present application also has a driving assembly 7 arranged inside the spindle box 3. The driving assembly 7 is mainly used to drive the tool holder 6 to rotate and mill, and drive the tool holder 6 to move, so as to realize the processing and forming of the countersunk threaded hole. The driving assembly 7 includes a fixed shaft 71. The fixed shaft 71 itself is fixed in position, and the fixed shaft 71 is located directly above the center of the countersunk hole on the surface of the workpiece body 4. A rotating frame 72 is arranged at the lower end of the fixed shaft 71. The two ends of the rotating frame 72 are respectively sleeved on the outside of the fixed shaft 71 and the outside of the coolant delivery pipe 8, and one end of the rotating frame 72 is fixed to the coolant delivery pipe 8, and the other end of the rotating frame 72 is rotatably connected to the fixed shaft 71. In other words, The rotating frame 72 can rotate around the fixed axis 71, and drive the coolant delivery pipe 8 and the processing spindle 5 to move, thereby driving the tool seat 6 to move. At the same time, since the coolant delivery pipe 8 and the rotating frame 72 remain fixed, the arc-shaped groove 81 on the surface of the coolant delivery pipe 8 can continuously change its direction when the rotating frame 72 rotates, thereby ensuring that the arc-shaped groove 81 is always facing the contact position between the milling cutter 62 and the inner wall of the countersunk hole. A telescopic part 721 that can adjust its own length is provided in the middle of the rotating frame 72. The telescopic part 721 is an electric push rod. When the telescopic part 721 is extended and retracted, the distance between the processing spindle 5 and the fixed axis 71 can be adjusted, thereby enabling the milling cutter 62 to mill countersunk holes with different inner diameters.

[0049] In order to drive the tool holder 6 to rotate at high speed, the present application also has an extension frame 722 fixed at one end of the rotating frame 72, a spindle drive gear 723 is rotatably mounted at one end of the extension frame 722, and the spindle drive gear 723 is driven to rotate by a spindle drive motor 724, and a spindle drive ring gear 51 is fixedly arranged on the outer side of the upper end of the machining spindle 5, and the spindle drive ring gear 51 is meshed with the spindle drive gear 723 for transmission, such as Figure 8 As shown, when the spindle drive motor 724 is working, it can drive the processing spindle 5 to rotate through the meshing transmission of the spindle drive gear 723 and the spindle drive gear ring 51, thereby driving the tool holder 6 to rotate at high speed, and the milling cutter 62 can perform milling processing.

[0050] In order to drive the tool holder 6 to move, the present application also has an upper sealing disc 73 and a lower sealing disc 74 that are rotatably arranged from top to bottom on the outer side of the middle part of the fixed shaft 71. The upper sealing disc 73 and the lower sealing disc 74 are spliced ​​together to form a hollow disc structure, and the two are kept in rotational sealing by a sealing member 742, such as Figure 7 and Fig.10 As shown, the upper sealing disk 73 and the lower sealing disk 74 can rotate relative to each other, but the seal between the two is always maintained. The lower surface of the lower sealing disk 74 is penetrated with an adjustment waist hole 743. The upper end of the coolant delivery pipe 8 penetrates the adjustment waist hole 743 and extends to the inner cavity of the lower sealing disk 74. The length direction of the adjustment waist hole 743 is along the radius direction of the lower sealing disk 74. Fig. 9 As shown, the surface of the coolant delivery pipe 8 and the bottom wall of the lower sealing disk 74 are sealed by a flexible sealing layer 82. When the lower sealing disk 74 rotates, the inner wall of the adjusting waist hole 743 squeezes the upper outer wall of the coolant delivery pipe 8 and drives the coolant delivery pipe 8 and the machining spindle 5 to rotate around the fixed axis 71, thereby driving the tool seat 6 to move in position. However, the upper sealing disk 73 does not rotate at this time, so relative rotation occurs between the upper sealing disk 73 and the lower sealing disk 74. The setting of the sealing member 742 can ensure that the upper sealing disk 73 and the lower sealing disk 74 are always sealed, thereby avoiding leakage of the coolant between the upper sealing disk 73 and the lower sealing disk 74.

[0051] In order to transport coolant to the inner cavity of the coolant delivery pipe 8, the present application also has a fixed beam 75 installed at the upper end of the fixed shaft 71, a spindle moving gear 751 is rotatably installed in the middle of the fixed beam 75, and the spindle moving gear 751 is driven to rotate by the spindle moving motor 752, an annular gear ring 741 is fixedly provided on the outer wall of the lower sealing disk 74, and the annular gear ring 741 is meshed with the spindle moving gear 751 for transmission, a positioning boss 732 is fixedly provided on the upper surface of the upper sealing disk 73, and the positioning boss 732 is fixed to the fixed beam 75 by bolts, and the upper surface of the upper sealing disk 73 is fixedly connected to the coolant inlet pipe 731, as shown in FIG. Fig. 9 and Fig.10 As shown, the coolant inlet pipe 731 can transport the external coolant to between the upper sealing disk 73 and the lower sealing disk 74, and then enter the inner cavity of the coolant delivery pipe 8. The arrangement of the upper sealing disk 73 and the lower sealing disk 74 ensures that during the rotation and movement of the coolant delivery pipe 8, the coolant inlet pipe 731 does not need to move with it and can always remain connected with the coolant delivery pipe 8. In addition, when the spindle moving motor 752 is working, it can drive the lower sealing disk 74 to rotate through the meshing transmission between the spindle moving gear 751 and the annular gear ring 741, thereby realizing the position movement of the tool seat 6.

[0052] In order to recycle the coolant, the present application also has a three-jaw chuck 101 installed on the side wall of the inner cavity of the shell 1, which can be used to clamp the columnar workpiece, thereby improving the application scope of the device. A clamping tool 201 for positioning the workpiece body 4 is provided in the middle of the workbench 2, and the surface of the clamping tool 201 is a porous structure. A reflux groove for recovering the coolant is provided under the workbench 2 to ensure that the coolant of the device can be recycled and reused.

[0053] The present invention also discloses a processing method of the machining center for processing threaded parts according to the above, which specifically comprises the following steps:

[0054] Step 1: Place the workpiece body 4 on the workbench 2 and position it, move the spindle box 3 downward, and extend the tool holder 6 from top to bottom into the countersunk hole on the upper surface of the workpiece body 4;

[0055] Step 2: Start the spindle drive motor 724 to drive the machining spindle 5 and the tool holder 6 to rotate. At this time, the milling cutter 62 mills the inner wall of the countersunk hole. At the same time, start the spindle moving motor 752 to drive the lower sealing disk 74 to rotate slowly. When the lower sealing disk 74 rotates, it drives the rotating frame 72 to rotate around the fixed axis 71, and then drives the tool holder 6 to move in the inner cavity of the countersunk hole through the machining spindle 5, so as to realize milling of various positions of the inner wall of the countersunk hole;

[0056] Step 3: During the milling process, coolant is delivered to the inner cavity of the coolant delivery pipe 8 through the coolant inlet pipe 731, and the coolant is ejected through the arc-shaped through groove 81 and the coolant discharge hole 64, and sprayed on the inner wall of the countersunk hole, so as to cool down the milling cutter 62 in contact with the inner wall of the countersunk hole and flush the debris at the same time;

[0057] Step 4: During the rotation of the tool holder 6, the annular bushing 9 rotates accordingly, and the spiral blade 91 drives the coolant in the inner cavity of the countersunk hole to enter the inner cavity of the circulation groove 63 from bottom to top. The coolant is discharged through the coolant circulation hole 65. The debris in the coolant is filtered by the annular porous plate 92 and is adsorbed by the magnet sheet 93 and retained in the inner cavity of the circulation groove 63.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A machining center for threaded parts machining, characterized in that: include: A shell (1), a workbench (2) is arranged at the bottom of the inner cavity of the shell (1), a spindle box (3) is arranged above the workbench (2), a workpiece body (4) is placed on the surface of the workbench (2), a machining spindle (5) is arranged inside the spindle box (3), a tool seat (6) is fixedly connected to the lower end of the machining spindle (5), and the tool seat (6) is located in the countersunk hole of the machining spindle (5); A plurality of milling cutters (62) arranged in a circular array are mounted on the surface of the tool seat (6); a circulation groove (63) is provided at the lower end of the tool seat (6); a coolant delivery pipe (8) is provided at the upper portion of the inner cavity of the tool seat (6); a coolant discharge hole (64) in communication with the coolant delivery pipe (8) is provided at the upper portion of the surface of the tool seat (6); and a coolant circulation hole (65) in communication with the circulation groove (63) is provided at the lower portion of the surface of the tool seat (6); An annular bushing (9) is installed in the inner cavity of the circulation groove (63), the annular bushing (9) is a hollow structure, and the upper and lower upper openings are both trumpet-shaped and flared outward, the inner cavity of the annular bushing (9) is fixedly provided with a spiral blade (91), the upper end of the annular bushing (9) is provided with an annular porous plate (92), the annular porous plate (92) fits the inner wall of the circulation groove (63) and covers the coolant circulation hole (65), and the upper inner wall of the annular bushing (9) is provided with a magnet sheet (93).

2. A machining center for threaded parts processing according to claim 1, characterized in that: The surface of the tool seat (6) is provided with a plurality of T-slots (61) distributed in a circular array, the length direction of the T-slots (61) being consistent with the length direction of the tool seat (6), the plurality of milling cutters (62) being slidably inserted into the inner cavities of the plurality of T-slots (61) and being fixedly connected to the T-slots (61) by fixing bolts (621), the annular bushing (9) being connected to the circulation groove (63) by threads, and the tightening direction of the annular bushing (9) being consistent with the rotation direction of the tool seat (6).

3. A machining center for threaded parts according to claim 2, characterized in that: The coolant discharge holes (64) are provided in a plurality of groups and are evenly spaced along the length direction of the tool seat (6); each group of the coolant discharge holes (64) is provided with a plurality of coolant discharge holes and are distributed in a circular array around the tool seat (6); the surface of the coolant delivery pipe (8) is provided with a plurality of evenly spaced arcuate grooves (81) along its length direction; the arcuate grooves (81) correspond to the coolant discharge holes (64) and the central angle of the arcuate grooves (81) is sixty degrees.

4. A machining center for threaded parts according to claim 3, characterized in that: The machining spindle (5) is of a hollow structure, the upper end of the coolant delivery pipe (8) passes through the inner cavity of the machining spindle (5) and extends to the top of the machining spindle (5), the coolant delivery pipe (8) rotates inside the machining spindle (5) and the tool seat (6), and a seal is provided between the coolant delivery pipe (8) and the tool seat (6).

5. A machining center for threaded parts processing according to claim 4, characterized in that: A driving assembly (7) is arranged inside the spindle box (3), and the driving assembly (7) comprises a fixed shaft (71). A rotating frame (72) is arranged at the lower end of the fixed shaft (71), and two ends of the rotating frame (72) are respectively sleeved on the outside of the fixed shaft (71) and the outside of the coolant delivery pipe (8), and one end of the rotating frame (72) is fixed to the coolant delivery pipe (8). A telescopic member (721) capable of adjusting its own length is arranged in the middle of the rotating frame (72), and the telescopic member (721) is an electric push rod.

6. A machining center for threaded parts processing according to claim 5, characterized in that: An extension frame (722) is fixed to one end of the rotating frame (72), a main shaft driving gear (723) is rotatably mounted on one end of the extension frame (722), and the main shaft driving gear (723) is driven to rotate by a main shaft driving motor (724), and a main shaft driving ring gear (51) is fixedly arranged on the outer side of the upper end of the machining main shaft (5), and the main shaft driving ring gear (51) is meshed with the main shaft driving gear (723) for transmission.

7. A machining center for threaded parts processing according to claim 6, characterized in that: An upper sealing disk (73) and a lower sealing disk (74) are rotatably arranged on the outer side of the middle portion of the fixed shaft (71) from top to bottom. The upper sealing disk (73) and the lower sealing disk (74) are spliced ​​together to form a hollow disc structure, and a sealing member (742) is used to maintain a rotational seal between the upper sealing disk (73) and the lower sealing disk (74). An adjusting waist hole (743) is provided through the lower surface of the lower sealing disk (74). The upper end of the coolant delivery pipe (8) passes through the adjusting waist hole (743) and extends to the inner cavity of the lower sealing disk (74). The surface of the coolant delivery pipe (8) and the bottom wall of the lower sealing disk (74) are sealed through a flexible sealing layer (82).

8. A machining center for threaded parts according to claim 7, characterized in that: A fixed beam (75) is mounted on the upper end of the fixed shaft (71), a main shaft moving gear (751) is rotatably mounted on the middle part of the fixed beam (75), and the main shaft moving gear (751) is driven to rotate by a main shaft moving motor (752), an annular gear ring (741) is fixedly mounted on the outer wall of the lower sealing disk (74), and the annular gear ring (741) is meshed with the main shaft moving gear (751) for transmission, a positioning boss (732) is fixedly mounted on the upper surface of the upper sealing disk (73), and the positioning boss (732) is fixed to the fixed beam (75) by bolts, and a coolant inlet pipe (731) is fixedly connected to the upper surface of the upper sealing disk (73).

9. A machining center for threaded parts processing according to claim 8, characterized in that: A three-jaw chuck (101) is installed on the inner cavity side wall of the shell (1), a clamping tool (201) for positioning the workpiece body (4) is arranged in the middle of the workbench (2), and the surface of the clamping tool (201) is a porous structure, and a reflux groove for recovering coolant is arranged below the workbench (2).

10. A processing method for a threaded part processing center according to claim 9, characterized in that: The specific steps include: Step 1: Place the workpiece body (4) on the workbench (2) and position it, move the spindle box (3) downward, and extend the tool holder (6) from top to bottom into the countersunk hole on the upper surface of the workpiece body (4); Step 2: Start the spindle drive motor (724) to drive the machining spindle (5) and the tool holder (6) to rotate, and the milling cutter (62) mills the inner wall of the countersunk hole. At the same time, start the spindle moving motor (752) to drive the lower sealing disk (74) to rotate slowly. When the lower sealing disk (74) rotates, it drives the rotating frame (72) to rotate around the fixed axis (71), and then drives the tool holder (6) to move in the inner cavity of the countersunk hole through the machining spindle (5), so as to realize milling of various positions of the inner wall of the countersunk hole; Step 3: During the milling process, coolant is transported to the inner cavity of the coolant transport pipe (8) through the coolant inlet pipe (731), and the coolant is ejected through the arc-shaped through groove (81) and the coolant discharge hole (64) and sprayed onto the inner wall of the countersunk hole, so as to cool the milling cutter (62) in contact with the inner wall of the countersunk hole and flush the debris; Step 4: During the rotation of the tool holder (6), the annular bushing (9) rotates accordingly, and the spiral blade (91) drives the coolant in the inner cavity of the countersunk hole to enter the inner cavity of the circulation groove (63) from bottom to top. The coolant is discharged through the coolant circulation hole (65), and the debris in the coolant is filtered by the annular porous plate (92) and is adsorbed by the magnet sheet (93) and retained in the inner cavity of the circulation groove (63).

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