A turning-milling-drilling-boring-honing-broaching combined machine tool and machining process

Abstract

This invention discloses a combined turning, milling, drilling, boring, honing, and broaching machine tool and its processing technology, comprising a bed, spindle box, mechanical C-type center rest, hydraulic C-type center rest, four-pin centering center rest, tailstock, turning and milling cutter post system, tool post three-axis feed system, oiler, guide bracket, tool feed system, tool holder rotary indexing box, tool head radial feed system, tool holder, etc. This invention integrates turning, milling, drilling, boring, honing, and broaching processes, designing a machine tool that integrates turning, milling, drilling, boring, honing, and broaching processes and procedures. It meets the processing requirements of key processes for long pipes, has a small footprint, high output ratio, and can complete the machining of inner and outer diameters and internal helical lines (rifling) in a single setup, reducing auxiliary time and labor intensity, lowering costs, and offering high efficiency, high precision, energy saving, and environmental protection.

Description

Technical Field

[0001] This invention relates to the field of machining equipment, specifically to a combined turning, milling, drilling, boring, honing, and broaching machine tool and its machining process. Background Technology

[0002] Existing composite machine tools typically include those primarily for turning, milling, and grinding. There are also composite machine tools that combine different machining operations, such as those that combine cutting and grinding / lamination. Additionally, there are production-type composite machining tools that integrate turning and milling functions. Furthermore, composite machine tools that combine laser processing and are equipped with grinding and laser hardening functions have been developed. For a certain type of long tubular part, the machining of its inner and outer diameters, irregular surfaces, and internal helical grooves (rifling) are critical machining processes. Traditional machining processes require multiple machines to complete these processes. For example, machining the outer cylindrical surface, stepped irregular surface, and holes is done on a lathe, milling machine, or mill-turning machine. The inner hole is completed on a drilling-boring machine and a honing machine. The machining of the internal helix is ​​completed on a rifling broaching machine. Existing composite machine tools cannot meet the requirements of composite machining of such long tubular parts. This results in a large footprint, cumbersome material handling, multiple workpiece clamping, and a lot of auxiliary time, leading to a low output ratio, high manual management costs, high labor intensity, high energy consumption, and environmental unfriendliness. The multiple clamping and positioning reference conversions cause error accumulation, making it difficult to guarantee the positional accuracy of the workpiece and directly affecting the accuracy of the part's use. Summary of the Invention

[0003] This invention addresses the existing technical problems by providing a combined turning, milling, drilling, boring, honing, and broaching machine tool. This tool enables the completion of key processes in the machining of long tubular parts on a single machine tool, resulting in a small footprint, high output, reduced costs, less auxiliary time, reduced labor intensity for workers, high efficiency, high machining accuracy, and energy conservation and environmental protection.

[0004] The technical solution of the present invention is as follows:

[0005] A combined turning, milling, drilling, boring, honing, and broaching machine tool includes a bed, a workpiece support and positioning mechanism mounted on the bed, a workpiece turning and milling mechanism mounted on the bed, and a workpiece drilling, boring, honing, and broaching mechanism mounted on the bed.

[0006] Furthermore, the workpiece support and positioning mechanism includes a spindle box, a mechanical C-shaped center frame, a hydraulic C-shaped center frame, a four-pin centering center frame, and a tailstock; one end of the workpiece is fixed on the spindle box, the other end of the workpiece is pressed against the tailstock, and the middle position of the workpiece is positioned and supported by the mechanical C-shaped center frame and the hydraulic C-shaped center frame or the four-pin centering center frame.

[0007] Furthermore, the workpiece turning and milling mechanism includes a spindle box, a turning and milling cutter head system, and a three-axis feed system for the turning and milling cutter head; the spindle box is used to drive the workpiece to rotate, and the three-axis feed system for the turning and milling cutter head is used to drive the turning and milling cutter head system to perform turning and milling operations on the workpiece;

[0008] Furthermore, the workpiece drilling, boring, honing, and broaching mechanism includes an oil injector, a guide bracket, a tool bar rotary indexing box, a tool feed system, a tool head radial feed system, and a tool bar; one end of the tool bar is mounted on the oil injector, the other end of the tool bar is fixed on the tool bar rotary indexing box, and the middle position of the tool bar is guided and supported by the guide bracket;

[0009] Furthermore, the rotary indexing box of the tool holder is used to rotate the tool holder during drilling, boring, and honing operations; the tool feed system is used to move the tool holder horizontally during drilling, boring, honing, and broaching operations; and the radial feed system of the tool head is used to move the tool head radially during boring and broaching operations.

[0010] Furthermore, the bed adopts a segmented splicing structure, including multiple beds, with four guide rails arranged on each bed; the tool post three-axis feed system is installed on the double guide rails on the front side of the bed; the spindle box, mechanical C-type center rest, hydraulic C-type center rest, four-pin centering center rest, tailstock, oiler, guide bracket, tool holder rotary indexing box, tool feed system and tool tip radial feed system are all installed on the double guide rails on the rear side of the bed.

[0011] Furthermore, the four-pin centering frame includes a support base, a slewing ring, bearing one, bearing two, a rotating shaft, a locking nut, a guide pin, an adjusting nut, a wear-resistant sleeve, and a pin. Bearing one and bearing two are respectively installed on both sides of the support base, and the rotating shaft is installed on bearing one and bearing two. The slewing ring is installed on the rotating shaft, and the wear-resistant sleeve is interference-fitted into the through hole of the slewing ring. The pin passes through the through hole of the wear-resistant sleeve and the rotating shaft, and is engaged in the keyway of the rotating shaft, so that the pin can only move axially. The adjusting nut, which is threaded to the wear-resistant sleeve, adjusts the radial distance of the pin on the slewing ring according to the outer diameter of the workpiece, and locks the workpiece.

[0012] Furthermore, the guide bracket includes a support, a bearing sleeve, a bearing cover A, bearing A, bearing C, bearing B, a pressure sleeve, a clamping sleeve, a spring, a tool holder sleeve, a top ring, a piston inner sleeve, a piston, a rotating shaft, bearing cover B, a pressure cap, and a tapered sleeve; the bearing sleeve is installed on the support, bearing A and bearing B are respectively installed on both sides of the bearing sleeve, the rotating shaft is installed on bearing A and bearing B, and bearing cover A and bearing cover B press against the corresponding end faces of bearing A and bearing B; the tapered sleeve is installed in the tapered surface of the rotating shaft, the pressure sleeve and the top ring are respectively fitted to both sides of the tapered sleeve, bearing C is installed on the pressure sleeve, the piston inner sleeve is installed on the bearing cover A, and the piston is installed between the piston inner sleeve and the bearing cover A;

[0013] When oil enters the oil passage on bearing cover A, it pushes the piston to the right, and transmits the force to the tapered sleeve through bearing C and pressure sleeve. The radial force generated by the conical surface of the rotating shaft clamps the tool holder. The radial clamping force can be adjusted by adjusting the oil pressure.

[0014] The clamping cover is fixedly installed on the rotating shaft. A spring is provided between the top ring and the clamping cover. When the oil passage on the bearing cover A is unloaded, the spring force is transmitted to the tapered sleeve through the top ring and moves to the left, and the tool holder sleeve is released from the working tool holder.

[0015] Furthermore, the guide bracket also includes a rotor, which is mounted on a support. The pressure cap can rotate around the rotor, presses the bearing sleeve, and is fixed on the support.

[0016] Furthermore, the tool holder sleeve is installed in the inner hole of the tapered sleeve, and the tool holder sleeve is made of vibration damping material; the clamping sleeve is fitted with one side of the tool holder sleeve and is fixedly installed in the inner hole of the clamping sleeve.

[0017] Furthermore, the radial feed system for the cutter head includes a servo motor, motor mount, lead screw, nut, coupling, support base, tension bolt, inner tapered sleeve, outer tapered sleeve, slide plate, flange cover, inner rod, guide flange, bushing, tie rod, cutter head mounting rod, spring, screw, cutter head, and tapered rod;

[0018] The pull rod is connected to the cutter head mounting rod. The cutter head mounting rod contains a tapered rod. One side of the spring piece is connected to the cutter head, and the other side of the spring piece contacts the tapered rod. The spring piece is fixed to the cutter rod by a screw in the middle.

[0019] The tie rod contains an inner rod, which is connected to the tapered rod. The guide flange is fixed to the flange cover, which is fixedly installed on the support seat. The support seat contains a sliding plate, and the nut is fixedly installed on the sliding plate. The lead screw is connected to the nut. The inner rod passes through the guide flange and the inner cone and is fixedly connected by a tension bolt. The end of the lead screw shaft is connected to the servo motor through a coupling.

[0020] The servo motor rotates, driving the lead screw to rotate, which is converted into linear motion of the slide plate. This, in turn, causes the inner rod to move left and right, thus moving the tapered rod left and right to complete the radial feed and retraction of the guide head.

[0021] Furthermore, the tapered rod is in the form of a double pair of tapered shapes, with the cutting head contacting one tapered part of the tapered rod and the spring contacting the other tapered part of the tapered rod.

[0022] Furthermore, a first sealing ring is provided between the piston inner sleeve and the piston, and a second sealing ring is provided between the bearing cap A and the piston.

[0023] A machining process for a combined turning, milling, drilling, boring, honing, and broaching machine tool, comprising the following steps:

[0024] 1) Workpiece positioning turning:

[0025] At least two four-pin centering supports are installed on the workpiece. The workpiece and the four-pin centering supports are hoisted together onto the machine bed and fixed to the machine bed. One end of the workpiece is fixed to the spindle box, and the other end is tightened by the tailstock. The pins on the four-pin centering supports are adjusted according to the contact between the outer circle of the workpiece and the pins, and then locked. Using the three-axis feed system of the milling cutter post and the milling cutter post system, several positions are machined on the workpiece.

[0026] 2) Workpiece milling and turning:

[0027] Remove the four-pin centering support, install the mechanical C-type center support and hydraulic C-type center support at the workpiece position and fix them to the bed, and provide support. Fix one end of the workpiece to the spindle box and tighten the other end through the tailstock. Use the three-axis feed system and the milling cutter head system to perform the milling operation.

[0028] 3) Drilling, boring, grinding, and broaching:

[0029] Remove the tailstock, press the oiler against the workpiece, pass the guide rod through the guide bracket, and connect the tool holder to the tool holder rotary indexing box. During drilling, boring, and grinding, the tool holder rotates under the drive of the tool holder rotary indexing box to complete the drilling, boring, and grinding process. When broaching the internal helix, the tool holder is indexed under the drive of the tool holder rotary indexing box to complete the machining of the multi-start helix. Under the drive of the tool head radial feed system, the tool head performs radial feed to complete the radial machining of the internal helix.

[0030] The beneficial effects of this invention are as follows:

[0031] This invention integrates turning, milling, drilling, boring, honing, and broaching processes. It designs a machine that integrates turning, milling, drilling, boring, honing, and broaching processes and procedures to meet the processing requirements of key processes for long pipes. The machine has a small footprint, high output ratio, and can complete the machining of inner and outer diameters and internal helical lines (rifling) in a single clamping. It reduces auxiliary time and the labor intensity of workers, lowers costs, and is efficient, precise, energy-saving, and environmentally friendly.

[0032] The four-pin centering frame designed in this invention can be used with machine tools to achieve precision machining of pipes with large roundness deviations or long lengths, thereby improving the machining capabilities of the machine tools.

[0033] The guide bracket designed in this invention can improve the machining accuracy of the tool holder, reduce vibration during the machining process, and further ensure the quality of the workpiece machining.

[0034] The radial feed system for the cutting head designed in this invention breaks free from the constraints of traditional broaching machining using tooth rise, enabling the precision machining of long pipe fittings. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 This is a schematic diagram of the segmented bed structure of the present invention;

[0037] Figure 3 This is a schematic diagram of the side structure of the bed of the present invention;

[0038] Figure 4 This is a schematic diagram of the internal structure of the four-pin centering frame of the present invention;

[0039] Figure 5 For the present invention Figure 4 A schematic diagram of the BB cross-sectional structure;

[0040] Figure 6 This is a schematic diagram of the internal structure of the guide bracket of the present invention;

[0041] Figure 7 This is a schematic diagram of the side structure of the guide bracket of the present invention;

[0042] Figure 8 This is a schematic diagram of the cutter head structure of the radial feed system of the present invention;

[0043] Figure 9 This is a schematic diagram of the mounting structure of the inner rod portion of the radial feed system for the cutter head according to the present invention;

[0044] Figure 10 This is a schematic diagram of the processing rack position according to an embodiment of the present invention;

[0045] Figure 11 This is a schematic diagram of milling and turning machining according to an embodiment of the present invention;

[0046] Figure 12 This is a schematic diagram of the drilling, boring, honing, and broaching process of the present invention;

[0047] Figure 13 This is a schematic diagram of the installation structure of the processing rack position in this invention;

[0048] Figure 14 This is a schematic diagram of the installation structure for the milling and turning process of the present invention;

[0049] Figure 15 This is a schematic diagram of the installation structure for the drilling, boring, honing, and broaching machining process of the present invention. Detailed Implementation

[0050] To make the purpose, technical solution, and advantages of the invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and do not limit the invention.

[0051] like Figure 1As shown, a combined turning, milling, drilling, boring, honing, and broaching machine tool includes a bed 1, a spindle box 2, a mechanical C-type center rest 3, a hydraulic C-type center rest 4, a four-pin centering center rest 5, a tailstock 6, a turning and milling cutter post system 7, a three-axis feed system for the cutter post 8, an oiler 9, a guide bracket 10, a tool feed system 11, a tool holder rotary indexing box 12, a cutter head radial feed system 13, and a tool holder, etc.

[0052] like Figure 2 As shown, a milling, turning, drilling, boring, honing, and broaching composite machine tool adopts a horizontal layout. The length of the bed 1 can be spliced ​​according to the actual workpiece length. In this embodiment, the bed 1 is composed of multiple bed splices to support the parts mounted on the bed.

[0053] like Figure 3 As shown, the bed 1 is arranged with four guide rails. The three-axis tool post feed system 8 is installed on the double guide rails on the front side of the bed. The milling cutter post system 7 is installed on the three-axis tool post feed system 8. The spindle box 2, mechanical C-type center rest 3, hydraulic C-type center rest 4, four-pin centering center rest 5, tailstock 6, oiler 9, guide bracket 10, tool feed system 11, tool holder rotary indexing box 12, tool head radial feed system 13, and tool holder are installed on the double guide rails on the rear side of the bed.

[0054] like Figure 4-5 As shown, the four-pin centering support is typically used in pre-machining processes for turning long tube parts. The four-pin centering support includes a support base 501, a rotary ring 502, rotary ring through-hole 1 502-1, rotary ring through-hole 2 502-2, rotary ring through-hole 3 502-3, rotary ring through-hole 4 502-4, bearing cap 1 503, bearing cap 2 504, bearing 1 505, bearing 2 506, a rotating shaft 507, rotating shaft through-hole 1 507-1, rotating shaft through-hole 2 507-2, rotating shaft through-hole 3 507-3, rotating shaft through-hole 4 503-4, a locking nut 508, a guide pin 509, an adjusting nut 510, a wear-resistant sleeve 511, a pin 512, and a clamping plate 513.

[0055] The rotating shaft 507 is mounted on bearing 505 and bearing 506. Bearing 505 and bearing 506 are mounted on support 501. Bearing cap 503, bearing cap 504, and locking nut 508 are pressed against the shaft holes of bearing 505 and bearing 506 by the corresponding surfaces of the rotating shaft 507. The slewing ring 502 is mounted on the rotating shaft 507. Four wear-resistant sleeves 511 are interference-fitted into the four through holes of the slewing ring 502. Four pins 512 pass through the wear-resistant sleeves 511 and the shaft. The four through holes of shaft 507 allow guide pins 509 to engage with the keyway of pin 512, enabling pin 512 to move only axially without rotation. The clamping plate 513 is fixedly installed on pin 512 and contacts the workpiece. The wear-resistant sleeve 511 is threadedly connected to the adjusting nut 510, which adjusts the radial distance of pin 512 on the rotary ring 502 according to the outer diameter of the workpiece and locks the workpiece, ultimately ensuring smooth rotation of the workpiece. When the workpiece diameter is different, only pin 512 needs to be replaced to meet the clamping requirements.

[0056] like Figure 6-7The guide bracket shown has a vibration damping structure that applies radial additional force for supporting drill and boring tool holders. The guide bracket includes a support 1001, bearing sleeve 1002, bearing cover A1003, bearing A1004, bearing C1005, bearing B1006, pressure sleeve 1007, clamping sleeve 1008, sealing ring one 1009, spring 1010, tool holder sleeve 1011, top ring 1012, piston inner sleeve 1013, piston 1014, rotating shaft 1015, bearing cover B1016, pressure cap 1017, tapered sleeve 1018, sealing ring two 1019, rotor 1020, etc. Bearings A1004 and B1006 are mounted on bearing sleeve 1002. Shaft 1015 is mounted on bearings A1004 and B1006. Bearing caps A1003 and B1016 press against the corresponding end faces of bearings A1004 and B1006. Tapered sleeve 1018 is mounted inside the tapered surface of shaft 1015. Pressure sleeve 1007 and top ring 1012 are fitted against both sides of tapered sleeve 1018. Bearing C1005 is mounted on pressure sleeve 1007. Piston inner sleeve 1013 is mounted on bearing cap A1003. Piston 101... 4. Between the piston inner sleeve 1013 and the bearing cover A1003, the material of the tool holder sleeve 1011 has vibration damping properties. The tool holder sleeve 1011 is installed in the inner hole of the tapered sleeve 1018. The clamping sleeve 1008 is in contact with one side of the tool holder sleeve 1011 and is fixedly installed in the inner hole of the clamping sleeve 1007. When oil enters the oil passage on the bearing cover A1003, it pushes the piston 1014 to the right. The force is transmitted to the tapered sleeve 1018 through the bearing C1005 and the clamping sleeve 1007. The radial force formed by the rotating shaft tapered surface 1015-1 clamps the tool holder. The radial clamping force is adjusted by adjusting the oil pressure. The clamping cover 1021 is fixedly installed on the rotating shaft 1015. A spring 1010 is provided between the top ring 1012 and the clamping cover 1021. When the oil passage on the bearing cover A1003 is unloaded, the spring force is transmitted to the tapered sleeve 1018 through the top ring 1012, causing it to move to the left, and the tool holder sleeve 1011 releases the tool holder. The clamping cover 1017 can rotate around the rotor 1018. When all structural components are assembled, it can be installed on the support 1001. The clamping cover 1017 clamps the bearing sleeve 1002 and is fixed on the support 1001, forming a guide bracket installed on the machine bed. During drilling and boring, the tool holder and tool holder sleeve 1011, tapered sleeve 1018, top ring 1012, clamping cover 1021, spring 1010, clamping sleeve 1007, clamping sleeve 1008, and rotating shaft 1015 rotate under the support of bearing A1004 and bearing C1005.

[0057] like Figure 8-9As shown, the radial feed system for the cutter head includes a servo motor 1301, a motor base 1302, a lead screw 1303, a nut 1304, a coupling 1305, a support base 1306, a tension bolt 1307, an inner tapered sleeve 1308, an outer tapered sleeve 1309, a slide plate 1310, a flange cover 1311, an inner rod 1312, a guide flange 1313, a bushing 1314, a tie rod 1315, a cutter head mounting rod 1316, a spring 1317, a screw 1318, a cutter head 1319, and a tapered rod 1320.

[0058] The pull rod 1315 is connected to the cutter head mounting rod 1316. The cutter head mounting rod 1316 contains a tapered rod 1320 and cutter heads 1319, matched according to the number of inner grooves. In this example, four cutter heads 1319 are installed. Screws 1318 and spring clips 1317 are matched according to the number of cutter heads 1319. The left side of the spring clip 1317 connects to the cutter head 1319, and the right side contacts the tapered rod 1320. The tapered rod 1320 is a double-paired tapered shape. The pull rod 1315 contains an inner rod 1312, which is connected to the tapered rod 1320. When the inner rod 1312 moves to the right, it causes the tapered rod 1320 to move to the right, and the spring 1317 rotates clockwise around the screw 1318. The cutter head 1319 opens outward to achieve radial feed. When the inner rod 1312 moves to the left, it causes the tapered rod 1320 to move to the left, and the spring 1317 rotates counterclockwise around the screw 1318. The cutter head 1319 retracts inward to achieve radial retraction.

[0059] The guide flange 1313 is fixed on the flange cover 1311, the flange cover 1311 is fixedly installed on the support seat 1306, the support seat 1306 is equipped with the slide plate 1310, the nut 1304 is fixedly installed on the slide plate 1310, the lead screw 1303 is connected to the nut 1304, the inner rod 1312 passes through the guide flange 1313 and the inner cone sleeve 1308, and is fixedly connected with the tension screw 1307. The shaft end of the lead screw 1303 is connected to the servo motor 1301 through the coupling 1305. When the servo motor 1301 rotates, it drives the lead screw 1303 to rotate, which is converted into the linear motion of the slide plate 1310, thereby driving the inner rod 1312 to move left and right, so that the cone rod 1320 moves left and right, completing the radial feed and retraction of the guide head;

[0060] When the inner rod 1312 moves to the right, it causes the tapered rod 1320 to move to the right. The spring 1317 rotates clockwise around the screw 1318, and the cutter head 1319 opens outward to achieve radial feed. When the inner rod 1312 moves to the left, it causes the tapered rod 1320 to move to the left. The spring 1317 rotates counterclockwise around the screw 1318, and the cutter head 1319 retracts inward to achieve radial retraction.

[0061] A machining process for a combined turning, milling, drilling, boring, honing, and broaching machine tool is as follows:

[0062] Figure 10As shown, this invention can accommodate the pre-processing of workpieces with poor cylindricity of their outer diameter. Several mounting positions are machined on the workpiece to prepare for subsequent processes, eliminating the need for additional equipment and reducing costs. Figure 11 The diagram shown illustrates the process flow of a workpiece after milling and turning according to this invention. This invention can machine outer diameters, steps, conical surfaces, planes, and various complex shapes. Figure 12 The diagram shows the process of drilling, boring, honing, and broaching a workpiece in this invention. The machining of the inner spiral involves drilling, boring, honing, and broaching. The accuracy of these processes directly affects the accuracy of the workpiece.

[0063] like Figure 13 The diagram shows the workpiece being machined in a stand position for the long tube parts according to the present invention. The workpiece is clamped by a four-clamp chuck at the front end of the spindle box, and the workpiece is supported by a tailstock. A four-pin centering frame is installed between the two. Depending on the long end of the workpiece, one or more pins can be used. The pins on the four-pin centering frame are adjusted and locked according to the contact between the outer circle of the workpiece and the pins. The workpiece can then be machined in a stand position.

[0064] like Figure 14 The diagram shows the milling and turning process for machining long tube parts according to the present invention. The four-pin centering support is removed, and a mechanical C-type center support and a hydraulic C-type center support are installed at the workpiece position and supported. The number of center supports is selected according to the length of the workpiece. The four-jaw chuck at the front end of the spindle box clamps the workpiece, and the tailstock holds the workpiece. The spindle box system is started, and the milling and turning process for the long tube parts is completed by changing the tool and the three-axis feed system of the tool holder according to the different machining positions.

[0065] like Figure 15 The above describes the drilling, boring, and broaching process for long tube parts according to the present invention. The tailstock is removed, the oiler is pressed against the workpiece, the guide rod passes through the guide bracket, and the number of guide brackets is matched according to the length of the tool holder. The tool holder is connected to the tool holder rotary indexing box. During drilling and boring, the tool holder rotates under the drive of the tool holder rotary indexing box to complete the drilling and boring process. For broaching the internal helix, the tool holder is indexed under the drive of the tool holder rotary indexing box to complete the machining of the multi-start helix. Driven by the radial feed system of the tool head, the insert makes radial feed to complete the radial machining of the internal helix.

Claims

1. A combined turning, milling, drilling, boring, honing, and broaching machine tool, characterized in that, It includes a bed (1), a workpiece support and positioning mechanism mounted on the bed (1), a workpiece milling and turning mechanism mounted on the bed (1), and a workpiece drilling, boring, honing, and broaching mechanism mounted on the bed (1); The workpiece support and positioning mechanism includes a spindle box (2), a mechanical C-shaped center frame (3), a hydraulic C-shaped center frame (4), a four-pin centering center frame (5), and a tailstock (6); one end of the workpiece is fixed on the spindle box (2), the other end of the workpiece is pressed against the tailstock (6), and the middle position of the workpiece is positioned and supported by the mechanical C-shaped center frame (3) and the hydraulic C-shaped center frame (4) or the four-pin centering center frame (5); The workpiece turning and milling mechanism includes a spindle box (2), a turning and milling tool holder system (7), and a three-axis feed system (8) for the turning and milling tool holder. The spindle box (2) is used to drive the workpiece to rotate, and the three-axis feed system (8) for the turning and milling tool holder system (7) is used to drive the turning and milling tool holder system (7) to perform turning and milling operations on the workpiece. The workpiece drilling, boring, honing, and broaching mechanism includes an oil injector (9), a guide bracket (10), a tool bar rotary indexing box (11), a tool feed system (12), a tool head radial feed system (13), and a tool bar; one end of the tool bar is mounted on the oil injector (9), and the other end of the tool bar is fixed on the tool bar rotary indexing box (11). The middle position of the tool bar is guided and supported by the guide bracket (10); The rotary indexing box (11) is used to rotate the tool bar during drilling, boring, and honing operations; the tool feed system (12) is used to move the tool bar horizontally during drilling, boring, honing, and broaching operations; and the radial feed system (13) is used to move the tool head radially during boring and broaching operations. The bed (1) adopts a segmented splicing structure, including multiple beds, and four guide rails are arranged on the bed; the tool post three-axis feed system (8) is installed on the front double guide rail of the bed (1); the spindle box (2), mechanical C-type center frame (3), hydraulic C-type center frame (4), four-pin centering center frame (5), tailstock (6), oiler (9), guide bracket (10), tool bar rotary indexing box (11), tool feed system (12) and tool head radial feed system (13) are all installed on the rear double guide rail of the bed (1); The guide bracket (10) includes a support (1001), a bearing sleeve (1002), a bearing cover A (1003), a bearing A (1004), a bearing C (1005), a bearing B (1006), a pressure sleeve (1007), a clamping sleeve (1008), a spring (1010), a tool holder sleeve (1011), a top ring (1012), a piston inner sleeve (1013), a piston (1014), a rotating shaft (1015), a bearing cover B (1016), a pressure cover (1017), and a tapered sleeve (1018). The bearing sleeve (1002) is mounted on the support (1001), and bearings A (1004) and B (1006) are respectively mounted on the bearing sleeve. On both sides of (1002), the rotating shaft (1015) is installed on bearing A (1004) and bearing B (1006), and bearing cover A (1003) and bearing cover B (1016) press against the corresponding end faces of bearing A (1004) and bearing B (1006); the tapered sleeve (1018) is installed in the tapered surface of the rotating shaft (1015), the pressure sleeve (1007) and the top ring (1012) are respectively attached to both sides of the tapered sleeve (1018), the bearing C (1005) is installed on the pressure sleeve (1007), the piston inner sleeve (1013) is installed on the bearing cover A (1003), and the piston (1014) is installed between the piston inner sleeve (1013) and the bearing cover A (1003); When oil enters the oil passage on bearing cover A (1003), it pushes piston (1014) to move to the right, and transmits force to tapered sleeve (1018) through bearing C (1005) and pressure sleeve (1007). The radial force formed by the rotating shaft tapered surface (1015-1) presses the tool bar. The radial clamping force can be adjusted by adjusting the oil pressure. The clamping cover (1021) is fixedly installed on the rotating shaft (1015). A spring (1010) is provided between the top ring (1012) and the clamping cover (1021). When the oil passage on the bearing cover A is unloaded, the spring force is transmitted to the tapered sleeve (1018) through the top ring (1012) and moved to the left, and the tool holder sleeve (1011) loosens the tool holder. The radial feed system (13) for the cutter head includes a servo motor (1301), a motor base (1302), a lead screw (1303), a nut (1304), a coupling (1305), a support base (1306), a tension bolt (1307), an inner tapered sleeve (1308), an outer tapered sleeve (1309), a slide plate (1310), a flange cover (1311), an inner rod (1312), a guide flange (1313), a bushing (1314), a tie rod (1315), a cutter head mounting rod (1316), a spring (1317), a screw (1318), a cutter head (1319), and a tapered rod (1320). The pull rod (1315) is connected to the cutter head mounting rod (1316). The cutter head mounting rod (1316) contains a tapered rod (1320). One side of the spring piece (1317) is connected to the cutter head (1319), and the other side of the spring piece (1317) contacts the tapered rod (1320). The spring piece (1317) is fixed to the cutter head mounting rod (1316) in the middle by a screw (1318). The tie rod (1315) contains an inner rod (1312), which is connected to the tapered rod (1320). The guide flange (1313) is fixed on the flange cover (1311), which is fixedly installed on the support seat (1306). The support seat (1306) contains a sliding plate (1310), and the nut (1304) is fixedly installed on the sliding plate (1310). The lead screw (1303) is connected to the nut (1304). The inner rod (1312) passes through the guide flange (1313) and the inner tapered sleeve (1308) and is fixedly connected with the tension bolt (1307). The shaft end of the lead screw (1303) is connected to the servo motor (1301) through the coupling (1305). The servo motor (1301) rotates, driving the lead screw (1303) to rotate, which is converted into linear motion of the slide plate (1310), thereby driving the inner rod (1312) to move left and right, causing the tapered rod (1320) to move left and right, completing the radial feed and retraction of the cutter head.

2. The combined turning, milling, drilling, boring, honing, and broaching machine tool according to claim 1, characterized in that, The four-pin centering frame (5) includes a support base (501), a slewing ring (502), bearing one (505), bearing two (506), a rotating shaft (507), a locking nut (508), a guide pin (509), an adjusting nut (510), a wear-resistant sleeve (511), and a pin (512). Bearing one (505) and bearing two (506) are respectively installed on both sides of the support base (501), and the rotating shaft (507) is installed on bearing one (505) and the shaft. On the second bearing (506); the rotary ring (502) is installed on the rotating shaft (507), and the wear-resistant sleeve (511) is interference-fitted into the through hole of the rotary ring (502). The pin (512) passes through the through hole of the wear-resistant sleeve (511) and the rotating shaft (507) and is engaged in the keyway of the rotating shaft, so that the pin (512) can only move axially; the adjusting nut (510) threadedly connected to the wear-resistant sleeve (511) adjusts the radial distance of the pin (512) on the rotary ring (502) according to the outer circle of the workpiece, and locks the workpiece.

3. The combined turning, milling, drilling, boring, honing, and broaching machine tool according to claim 1, characterized in that, The guide bracket also includes a rotor (1020), which is mounted on a support (1001). A cover (1017) can rotate around the rotor (1020). The cover (1017) presses against the bearing sleeve (1002) and is fixed on the support (1001).

4. A combined turning, milling, drilling, boring, honing, and broaching machine tool according to claim 1, characterized in that, The tool holder sleeve (1011) is installed in the inner hole of the tapered sleeve (1018), and the tool holder sleeve (1011) is made of vibration damping material; the clamping sleeve (1008) is in contact with one side of the tool holder sleeve (1011) and is fixedly installed in the inner hole of the clamping sleeve (1007).

5. A combined turning, milling, drilling, boring, honing, and broaching machine tool according to claim 1, characterized in that, The cone rod (1320) is double-conical, with the cutter head (1319) in one conical contact with the cone rod (1320) and the spring piece (1317) in the other conical contact with the cone rod (1320).

6. A combined turning, milling, drilling, boring, honing, and broaching machine tool according to claim 1, characterized in that, A first sealing ring (1009) is provided between the piston inner sleeve (1013) and the piston (1014), and a second sealing ring (1019) is provided between the bearing cover A (1003) and the piston (1014).

7. The machining process of a combined turning, milling, drilling, boring, honing, and broaching machine tool according to any one of claims 1-6, characterized in that, The steps are as follows: 1) Workpiece positioning turning: At least two four-pin centering supports are installed on the workpiece. The workpiece and the four-pin centering supports are hoisted together onto the machine bed and fixed to the machine bed. One end of the workpiece is fixed to the spindle box, and the other end is tightened by the tailstock. The pins on the four-pin centering supports are adjusted according to the contact between the outer circle of the workpiece and the pins, and then locked. Using the three-axis feed system of the milling cutter post and the milling cutter post system, several positions are machined on the workpiece. 2) Workpiece milling and turning: Remove the four-pin centering support, install the mechanical C-type center support and hydraulic C-type center support at the workpiece position and fix them to the bed, and provide support. Fix one end of the workpiece to the spindle box and tighten the other end through the tailstock. Use the three-axis feed system and the milling cutter head system to perform the milling operation. 3) Drilling, boring, grinding, and broaching: Remove the tailstock, press the oiler against the workpiece, pass the guide rod through the guide bracket, and connect the tool holder to the tool holder rotary indexing box. During drilling, boring, and grinding, the tool holder rotates under the drive of the tool holder rotary indexing box to complete the drilling, boring, and grinding process. When broaching the internal helix, the tool holder is indexed under the drive of the tool holder rotary indexing box to complete the machining of the multi-start helix. Under the drive of the tool head radial feed system, the tool head performs radial feed to complete the radial machining of the internal helix.

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