Internal and external thread grinder

Abstract

The present application relates to the technical field of thread processing, and discloses an inner and outer thread composite grinding machine, which comprises a base, a direct drive headstock, a tailstock assembly, a corner transmission assembly, a grinding assembly and a corner lifting assembly. The upper side of the base is provided with a mounting groove. The front part of the mounting groove is provided with the direct drive headstock used for clamping workpieces. The right side of the direct drive headstock is provided with the tailstock assembly used for clamping the end of the workpiece. The inner side of the front part of the mounting groove is provided with the corner transmission assembly capable of rotating the direct drive headstock and the tailstock assembly in the same direction. The rear part of the corner transmission assembly is provided with the grinding assembly used for grinding the outer thread and the inner thread of the workpiece. The grinding machine mechanism is more compact. Compared with the grinding machine with the turret type and the double slide table structure, the grinding machine has a simple and light structure, the response speed and the running speed of the grinding machine are improved, the grinding operation of the inner and outer cylindrical surfaces, the inner and outer conical surfaces and the inner and outer threads can be completed after the direct drive headstock and the tailstock assembly clamp the workpiece to be processed at one time, the error caused by repeated clamping is reduced, and the grinding precision and the grinding efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of thread processing technology, specifically a composite grinding machine for internal and external threads. Background Technology

[0002] Thread machining is a process of machining workpieces using thread-making tools and techniques such as cutting, turning, milling, and grinding. It generally refers to methods of machining threads on workpieces using form tools or grinding wheels, mainly including turning, milling, tapping, threading, grinding, lapping, and whirl cutting. In turning, milling, and grinding, for each revolution of the workpiece, the machine tool's drive chain ensures that the cutting tool, milling cutter, or grinding wheel moves accurately and evenly along the workpiece's axial direction by one lead. In tapping or threading, the tool (taper or die) and the workpiece rotate relative to each other, and the pre-formed thread grooves guide the tool (or workpiece) in axial movement.

[0003] Thread grinding is mainly used for machining precision threads on hardened workpieces on thread grinding machines. It is divided into single-line grinding and multi-line grinding based on the shape of the grinding wheel cross-section. Single-line grinding can achieve a pitch accuracy of 5-6 grades and a surface roughness of R1.25-0.08 micrometers. Wheel dressing is relatively convenient. This method is suitable for grinding precision lead screws, thread gauges, worm gears, small batches of threaded workpieces, and grinding precision hobs. Multi-line grinding is further divided into longitudinal grinding and plunge grinding. In longitudinal grinding, the wheel width is smaller than the length of the thread being ground, and the thread is ground to its final size in one or several longitudinal strokes. In plunge grinding, the wheel width is larger than the length of the thread being ground, and the wheel radially cuts into the workpiece surface. The workpiece is ground to the desired size in about 1.25 revolutions, resulting in higher productivity but slightly lower accuracy, and wheel dressing is more complex. Plunge grinding is suitable for grinding large batches of taps and grinding threads for fasteners.

[0004] Patent document CN112605732A discloses an ultra-precision internal and external cylindrical composite grinding machine with a hydrostatic tailstock. It includes a Z-axis guide rail and an X-axis guide rail mounted on the machine tool's machining surface. The Z-axis guide rail has a Z-axis slide plate, on which a workpiece spindle and a hydrostatic tailstock are mounted. The X-axis guide rail has an X-axis slide table, on which a rotary platform is mounted. A column is mounted on the rotary platform, with an external cylindrical grinding wheel and an internal hole grinding wheel mounted at both ends of the column. The axes of the external cylindrical grinding wheel and the internal hole grinding wheel are perpendicular to the rotation axis of the rotary platform. The hydrostatic tailstock is positioned facing the workpiece spindle. The bottom of the hydrostatic tailstock is mounted on a W-axis slide plate. A W-axis guide rail parallel to the Z-axis slide plate is provided between the W-axis slide plate and the Z-axis slide plate. The W-axis slide plate is detachably mounted relative to the Z-axis slide plate. A center pin is provided at the end of the hydrostatic tailstock.

[0005] While the aforementioned ultra-precision internal and external cylindrical composite grinding machine combining a hydrostatic tailstock has advantages—namely, the workpiece spindle is set on the Z-axis guide rail to clamp the workpiece, and the other end of the detachable hydrostatic tailstock abuts against the other end of the workpiece to enhance the stability of the workpiece clamping; the hydrostatic tailstock presses down to perform external cylindrical machining, and the internal hole can be machined by removing the hydrostatic tailstock; it is applicable to the internal and external cylindrical machining of workpieces of any size and can effectively improve machining accuracy—its internal and external cylindrical grinding wheels cannot oscillate, meaning it cannot grind internal and external threads; its workpiece spindle and hydrostatic tailstock can only move axially relative to each other and cannot oscillate, nor can it grind conical surfaces.

[0006] Patent document CN207521827U discloses a CNC external thread grinding machine, including a machine tool base and a workpiece spindle and tailstock mounted on the machine tool base along the Z-axis. The tailstock can move on the machine tool base along the Z-axis. A rotary headstock is also fixedly mounted on one side of the machine tool base. The rotary headstock's rotation axis is perpendicular to the Z-axis. The rotary headstock is equipped with a grinding wheel electric spindle that can rotate around the rotation axis.

[0007] The aforementioned CNC external thread grinding machine can only process external threads of different specifications, but it cannot perform grinding operations on internal threads and conical surfaces.

[0008] Patent document CN203459777U discloses a CNC internal thread grinding composite machining system, comprising: a T-shaped bed composed of an X-axis bed and a Z-axis bed perpendicular to the X-axis bed; a controller mounted on the T-shaped bed; a grinding wheel spindle located above the X-axis bed; a workpiece spindle located above the Z-axis bed; and a rapid tool setting device located on the grinding wheel spindle; wherein the X-axis bed and the Z-axis bed are respectively provided with an X-axis guide rail and a Z-axis guide rail, and an X-axis slide plate and a Z-axis slide plate are respectively provided on the X-axis guide rail and the Z-axis guide rail; the grinding wheel spindle is located on the X-axis slide plate; the grinding wheel spindle includes an outer cylindrical end face grinding wheel spindle and an internal thread grinding wheel spindle located at the left and right ends of the X-axis slide plate, respectively used for grinding the outer cylindrical end face and the internal thread; and the workpiece spindle is located on the Z-axis slide plate.

[0009] Although the aforementioned CNC internal thread grinding composite machining system can achieve automatic and rapid tool setting during the grinding process of nut internal threads by measuring acoustic emission signals in real time, thus meeting the requirements for high-efficiency and high-precision machining of nuts, it cannot grind threads with various helix angles or conical surfaces with various tapers, and its grinding function is limited. Summary of the Invention

[0010] This invention provides a composite grinding machine for internal and external threads, which overcomes the shortcomings of the prior art and can effectively solve the problems of limited functionality and difficulty in adjusting the thread helix angle and taper of existing thread grinding equipment.

[0011] The technical solution of the present invention is achieved through the following measures: a composite grinding machine for internal and external threads, including a base, a direct drive headstock, a tailstock assembly, a rotary transmission assembly, a grinding assembly, and a rotary lifting assembly. The upper side of the base is provided with a mounting groove. A direct drive headstock for clamping the workpiece is provided in front of the mounting groove. A tailstock assembly for pressing the end of the workpiece is provided to the right of the direct drive headstock. A rotary transmission assembly that enables the direct drive headstock and the tailstock assembly to rotate in the same direction is provided in the inner front part of the mounting groove. A grinding assembly for grinding the external and internal threads of the workpiece is provided behind the rotary transmission assembly. A rotary lifting assembly that enables the grinding assembly to move left and right, forward and backward, and swing up and down on the left side is provided in the inner rear part of the mounting groove.

[0012] The following are further optimizations and / or improvements to the above-mentioned technical solution:

[0013] The aforementioned corner transmission assembly may include a fixed base, a support base, a left guide rail, a right guide rail, and a drive mechanism. The lower side of the fixed base is fixedly installed on the inner front side of the mounting groove. The support base is installed above the fixed base. An arc-shaped left guide rail with an opening to the right is fixedly installed on the upper left side of the fixed base. At least one left slider is slidably installed on the upper part of the left guide rail at intervals along the circumference. The upper side of each left slider is fixedly installed with the corresponding position on the lower left side of the support base. A right guide rail that is centrally symmetrical with the left guide rail is fixedly installed on the upper right side of the fixed base. At least one right slider is slidably installed on the upper part of the right guide rail at intervals along the circumference. The upper side of each right slider is fixedly installed with the corresponding position on the lower right side of the support base. The right side of the fixed base is provided with a drive mechanism that drives the support base to slide along the left and right guide rails. The direct drive head frame is fixedly installed on the upper left side of the support base, and the tailstock assembly is installed on the upper right side of the support base.

[0014] The aforementioned corner lifting assembly may include a cross slide and a threaded lifting device. A cross slide is installed on the inner side of the mounting groove corresponding to the rear position of the fixed base. The upper side of the cross slide and the lower side of the threaded lifting device are mounted together. The front side of the threaded lifting device is mounted together with the grinding assembly. The grinding assembly includes a fixed frame, a connecting seat, a first drive motor, a first grinding wheel, a second drive motor, a second grinding wheel, and a lifting motor. The rear side of the fixed frame is fixedly mounted together with the front side of the threaded lifting device. The first drive motor is fixedly mounted on the lower right side of the fixed frame. The outer side of the left end of the output shaft of the first drive motor is fixedly mounted... The device is equipped with a first grinding wheel for grinding external threads. Above the first drive motor, a lifting motor is fixedly installed on the upper right side of the fixed frame. A rotating sleeve is fixedly installed on the outer left side of the output shaft of the lifting motor. The outer side of the rotating sleeve is rotatably installed together with the front part of the fixed frame. The outer side of the middle part of the rotating sleeve is fixedly installed together with the rear side of the connecting seat. A second drive motor is installed at the front of the connecting seat. A second grinding wheel for grinding internal threads is fixedly installed on the outer left end of the output shaft of the second drive motor. A grinding wheel dressing device for dressing the first and second grinding wheels is provided on the upper side of the support seat corresponding to the position behind the direct drive head.

[0015] The aforementioned grinding assembly may also include a positioning cylinder and a hinge seat. A positioning cylinder is hinged to the upper side of the threaded helix device at the rear position of the rotating sleeve, and a hinge seat is fixedly installed on the upper side of the connecting seat at the front position of the rotating sleeve. The front end of the piston rod of the positioning cylinder is hinged to the hinge seat.

[0016] An installation platform can be fixed on the upper side of the support seat at the right position of the aforementioned direct drive head frame. The front part of the upper side of the installation platform is inclined upward relative to the rear part. The tailstock assembly includes a tailstock adjustment seat and a tailstock body. The tailstock body is located on the upper right side of the installation platform. A tailstock adjustment seat with a 7-shaped lower side is installed on the upper right side of the installation platform. The upper side of the tailstock adjustment seat is installed together with the lower side of the tailstock body.

[0017] The upper left side of the aforementioned installation platform can be fitted with a slide plate shaped like the number 7 on the lower side, and a central frame is fixedly installed on the right side of the slide plate.

[0018] The aforementioned drive mechanism may include a mounting base, a third drive motor, and a gear ring. The left side of the fixed base corresponding to the left position of the left guide rail has a stepped surface. An arc-shaped gear ring with an inward opening and coaxial with the left guide rail is fixedly installed on the upper side of the stepped surface. A mounting base is installed on the left side of the support base. The third drive motor is fixedly installed on the mounting base. A transmission gear that meshes with the outer side of the gear ring is fixedly installed at the lower end of the output shaft of the third drive motor.

[0019] The above may also include a hydraulic turntable, which is installed between the upper side of the fixed base and the lower side of the support base.

[0020] The above may also include a circulating pump and a control unit. The base is a mineral casting base. A conveying auger is installed in the mounting groove between the fixed seat and the cross slide. A chip removal hole communicating with the mounting groove is provided on the right side of the base corresponding to the outlet of the conveying auger. A U-shaped cooling channel with a rearward opening is provided on the inner side of the lower part of the base corresponding to the position below the mounting groove. Both ends of the cooling channel extend to the rear side of the base. The first end of the cooling channel is fixedly connected to a water inlet pipe, and the second end of the cooling channel is fixedly connected to the water inlet of the circulating pump. The water outlet of the circulating pump is fixedly connected to an outlet pipe. The front left and right sides of the base corresponding to the position in front of the cooling channel... Two downward-facing fixing holes are provided at intervals, and a temperature sensor is sealed and fixedly installed in each fixing hole. A front proximity switch and a rear proximity switch are fixedly installed at intervals on the upper side of the fixing seat corresponding to the right position of the right guide rail. A sensing block is fixedly installed on the right side of the support base between the front proximity switch and the rear proximity switch. The front proximity switch, the rear proximity switch, and each temperature sensor are all connected to the control unit. The control unit is connected to the first drive motor, the second drive motor, the third drive motor, the positioning cylinder, the grinding wheel dressing device, the lifting motor, the cross slide, the threaded helix device, the conveying auger, and the circulating pump.

[0021] The grinding mechanism of the present invention is more compact. Compared with turret-type and double-slide-type grinding machines, it has a simple and lightweight structure, which improves the response speed and running speed of the grinding machine. After the direct drive headstock and tailstock assembly clamps the workpiece to be processed at one time, it can complete the grinding operations of inner and outer cylindrical surfaces, inner and outer conical surfaces and inner and outer threads, reduce the error caused by repeated clamping, and improve grinding accuracy and grinding efficiency. Attached Figure Description

[0022] Appendix Figure 1 This is a schematic diagram of the main structure of Embodiment 1.

[0023] Appendix Figure 2 This is a top view of the structure of Example 1.

[0024] Appendix Figure 3 This is a schematic diagram of the right-side structure of Embodiment 1.

[0025] Appendix Figure 4 This is a schematic diagram of the left-side structure of Example 1.

[0026] Appendix Figure 5 This is a schematic diagram of the three-dimensional structure of Example 1. Figure 1 .

[0027] Appendix Figure 6 This is a schematic diagram of the three-dimensional structure of Example 1. Figure 2 .

[0028] Appendix Figure 7 This is a schematic diagram of the left sectional view of the installation platform in Example 5.

[0029] Appendix Figure 8 This is a top sectional view of the base structure in Example 9.

[0030] Appendix Figure 9 This is the circuit block diagram for Example 9.

[0031] The codes in the attached diagram are as follows: 1 for base, 2 for cross slide, 3 for direct drive headstock, 4 for fixed base, 5 for support base, 6 for left guide rail, 7 for left slider, 8 for right guide rail, 9 for right slider, 10 for mounting platform, 11 for front proximity switch, 12 for rear proximity switch, 13 for sensing block, 14 for tailstock body, 15 for tailstock adjustment base, 16 for threaded helix angle device, 17 for mounting groove, 18 for chip removal hole, 19 for slide plate, 20 for center frame, 21 for mounting base, 22 for... 23 is the first drive motor, 24 is the gear ring, 25 is the step surface, 26 is the transmission gear, 27 is the hydraulic turntable, 28 is the fixed frame, 29 is the connecting seat, 30 is the second drive motor, 31 is the first grinding wheel, 32 is the third drive motor, 33 is the second grinding wheel, 34 is the lifting motor, 35 is the rotating sleeve, 36 is the grinding wheel dressing device, 37 is the positioning cylinder, 38 is the hinge seat, 39 is the cooling channel, 40 is the water inlet pipe, 41 is the water outlet pipe, 42 is the fixing hole, and 43 is the circulating pump. Detailed Implementation

[0032] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0033] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0034] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0035] Example 1: As shown in the attached document Figures 1 to 6 As shown, the internal and external thread composite grinding machine includes a base 1, a direct drive headstock 3, a tailstock assembly, a rotary transmission assembly, a grinding assembly, and a rotary lifting assembly. The upper side of the base 1 is provided with a mounting groove 17. The front part of the mounting groove 17 is provided with a direct drive headstock 3 for clamping the workpiece. The right side of the direct drive headstock 3 is provided with a tailstock assembly for pressing the end of the workpiece. The inner front part of the mounting groove 17 is provided with a rotary transmission assembly that enables the direct drive headstock 3 and the tailstock assembly to rotate in the same direction. The rear part of the rotary transmission assembly is provided with a grinding assembly for grinding the external and internal threads of the workpiece. The inner rear part of the mounting groove 17 is provided with a rotary lifting assembly that enables the grinding assembly to move left and right, forward and backward, and swing up and down on the left.

[0036] During use, by setting the direct drive headstock 3 and tailstock assembly, the workpiece to be processed can be clamped and rotated. When it is necessary to grind the outer and inner walls of the workpiece, the angle lifting assembly drives the grinding assembly to move forward and approach the workpiece. The grinding assembly grinds the end of the workpiece. The angle lifting assembly drives the grinding assembly to move left and right, so that the grinding assembly grinds along the axis of the workpiece. After the grinding assembly finishes grinding the workpiece, the angle assembly drives the grinding assembly to move backward and then left and right to the initial position.

[0037] When the conical surface of the workpiece needs to be ground, the angle transmission assembly drives the direct drive headstock 3 and the tailstock assembly to rotate in the same direction, so that the angle of rotation of the workpiece between the direct drive headstock 3 and the tailstock assembly corresponds to half of the taper. The angle lifting assembly drives the grinding assembly to move forward and approach the workpiece. The grinding assembly grinds the end of the workpiece. The angle lifting assembly drives the grinding assembly to move left and right, so that the grinding assembly grinds along the axial direction of the workpiece. After the grinding assembly finishes grinding the workpiece, the angle assembly drives the grinding assembly to move backward and then left and right to the initial position.

[0038] When grinding the internal and external threads of the workpiece, the angle lifting assembly drives the left side of the grinding assembly to swing up and down, so that the swing angle of the grinding assembly corresponds to the thread helix angle. The angle lifting assembly drives the grinding assembly to move forward and approach the workpiece. The grinding assembly grinds the end of the workpiece. The angle lifting assembly drives the grinding assembly to move left and right, so that the grinding assembly grinds along the axis of the workpiece. After the grinding assembly finishes grinding the workpiece, the angle lifting assembly drives the grinding assembly to move backward first, and then left and right to the initial position.

[0039] The grinding mechanism of the present invention is more compact. Compared with turret-type and double-slide-type grinding machines, it is simple and lightweight, improving the response speed and running speed of the grinding machine. The grinding machine of the present invention has diverse grinding functions. After the workpiece to be processed is clamped at once by the direct drive headstock 3 and the tailstock assembly, grinding operations of inner and outer cylindrical surfaces, inner and outer conical surfaces and inner and outer threads can be completed, reducing the error caused by repeated clamping and improving grinding accuracy and grinding efficiency.

[0040] The above-mentioned internal and external thread composite grinding machine can be further optimized and / or improved according to actual needs:

[0041] Example 2: As an optimization of the above examples, as shown in the appendix. Figures 1 to 6As shown, the corner transmission assembly includes a fixed base 4, a support base 5, a left guide rail 6, a right guide rail 8, and a drive mechanism. The lower side of the fixed base 4 is fixedly installed on the inner front side of the mounting groove 17. The support base 5 is installed above the fixed base 4. An arc-shaped left guide rail 6 with an opening to the right is fixedly installed on the upper left side of the fixed base 4. At least one left slider 7 is slidably installed on the upper part of the left guide rail 6 at intervals along the circumference. The upper side of each left slider 7 is fixedly installed together with the corresponding position on the lower left side of the support base 5. A right guide rail 8 that is centrally symmetrical with the left guide rail 6 is fixedly installed on the upper right side of the fixed base 4. At least one right slider 9 is slidably installed on the upper part of the right guide rail 8 at intervals along the circumference. The upper side of each right slider 9 is fixedly installed together with the corresponding position on the lower right side of the support base 5. The right side of the fixed base is provided with a drive mechanism that drives the support base to slide along the left and right guide rails. The direct drive head frame 3 is fixedly installed on the upper left side of the support base 5, and the tailstock assembly is installed on the upper right side of the support base 5.

[0042] According to the requirements, the direct-drive headstock 3 is a known technology, such as the direct-drive headstock for a roll grinding machine in patent document CN214024847U, where the radius of the left guide rail 6 and the radius of the right guide rail 8 are the same. During use, the left guide rail 6 and the right guide rail 8 are centrally symmetrical, so the drive mechanism can drive the support seat 5 to rotate circumferentially on the left guide rail 6 and the right guide rail 8 on the horizontal plane. When it is necessary to grind the conical surface of the workpiece, the drive mechanism can be controlled to make the support seat 5 swing the workpiece, so that the conical surface of the workpiece is perpendicular to the grinding assembly, thereby improving the grinding accuracy of the workpiece. It can grind the outer circle, end face, inner hole, inner conical surface, outer conical surface, internal thread and external thread of the workpiece. By setting the left slider 7 and the right slider 9, it is convenient to disassemble and assemble the support seat 5 and the fixed seat 4.

[0043] Example 3: As an optimization of the above examples, as shown in the appendix. Figures 1 to 6As shown, the corner lifting assembly includes a cross slide 2 and a threaded lifting device 16. The cross slide 2 is installed on the inner side of the mounting groove 17 corresponding to the position behind the fixed base 4. The upper side of the cross slide 2 and the lower side of the threaded lifting device 16 are installed together. The front side of the threaded lifting device 16 is installed together with the grinding assembly. The grinding assembly includes a fixed frame 27, a connecting seat 28, a first drive motor 22, a first grinding wheel 30, a second drive motor 29, a second grinding wheel 32, and a lifting motor 33. The rear side of the fixed frame 27 is fixedly installed together with the front side of the threaded lifting device 16. The first drive motor 22 is fixedly installed on the lower right side of the fixed frame 27. The outer side of the left end of the output shaft of the first drive motor 22 is fixedly installed. The first grinding wheel 30 for grinding external threads is provided. Above the first drive motor 22, a lifting motor 33 is fixedly installed on the upper right side of the fixed frame 27. A rotating sleeve 34 is fixedly installed on the outer left side of the output shaft of the lifting motor 33. The outer side of the rotating sleeve 34 is rotatably installed together with the front of the fixed frame 27. The outer middle part of the rotating sleeve 34 is fixedly installed together with the rear side of the connecting seat 28. A second drive motor 29 is installed on the front of the connecting seat 28. A second grinding wheel 32 for grinding internal threads is fixedly installed on the outer left end of the output shaft of the second drive motor 29. A grinding wheel dressing device 35 for dressing the first grinding wheel 30 and the second grinding wheel 32 is provided on the upper side of the support seat 5 corresponding to the position behind the direct drive head frame 3.

[0044] Based on the requirements, the thread helix angle device 16 is a known prior art, such as the rotary table in the patent document CN116460746A entitled "Adjustable Helix Angle Grinding Online Dressing Device". The grinding wheel dressing device 35 is a known prior art, such as a diamond roller dresser, or a diamond pen grinding wheel dresser, or the thread dressing grinder in the patent document CN116330161A entitled "Adjustable Multi-line Thread Machining Dressing Worktable". The lifting motor 33 is a known prior art, such as a combination of a servo motor of model S08-AM3 series and a ZPGH helical right-angle precision planetary reducer. The first drive motor 22 and the second drive motor 29 are known electric spindles. The cross slide 2 is a known prior art, such as an XY dual-axis linear motor. This makes the grinding machine more compact and reduces wear on the lead screw in the transmission, meeting the requirements for long-term accuracy maintenance and high-speed machining operation.

[0045] When the lifting motor 33 is working, it can drive the rotating sleeve 34 to rotate, thereby causing the connecting seat 28 to rotate, and finally drive the second grinding wheel 32 to rotate to the position of the internal thread of the workpiece to be processed. If only the external thread needs to be ground, the lifting motor 33 can be controlled to flip the front end of the connecting seat 28 upward, which can avoid the mutual interference between the internal and external threads during processing. The direct drive headstock 3 can clamp the workpiece once to realize the processing of internal and external threads, reduce the number of workpiece clamping times and clamping errors, and improve the processing accuracy of the workpiece. The grinding wheel dressing device 35 can dress the first grinding wheel 30 and the second grinding wheel 32, increase the service life of the first grinding wheel 30 and the second grinding wheel 32, and reduce processing costs.

[0046] Example 4: As an optimization of the above examples, as shown in the appendix. Figures 1 to 6 As shown, the grinding assembly also includes a positioning cylinder 36 and a hinge seat 37. The positioning cylinder 36 is hinged to the upper side of the threaded helix device 16 at the rear position of the rotating sleeve 34, and the hinge seat 37 is fixedly installed on the upper side of the connecting seat 28 at the front position of the rotating sleeve 34. The front end of the piston rod of the positioning cylinder 36 is hinged to the hinge seat 37.

[0047] Based on the requirements, the positioning cylinder 36 is a known existing technology. For example, in the SCL-B series cylinders, the piston rod of the positioning cylinder 36 is hinged together with a known fisheye joint and hinge seat 37. During use, by setting up the positioning cylinder 36, the lifting motor 33 can drive the rotating sleeve 34 to rotate, thereby causing the connecting seat 28 to rotate, ultimately driving the second grinding wheel 32 to rotate to the position for grinding the internal thread of the workpiece. The positioning cylinder 36 can fix the fixing frame 27. The second grinding wheel 32 first moves smoothly and quickly into position via the lifting motor 33, and then is locked in place by the positioning cylinder 36, avoiding the vibration phenomenon that exists when the lifting motor 33 operates alone or the impact phenomenon that exists when the positioning cylinder 36 operates alone, thereby improving the machining accuracy of the internal thread of the workpiece.

[0048] Example 5: As an optimization of the above examples, as shown in the appendix. Figures 1 to 7 As shown, a mounting platform 10 is fixed on the upper side of the support base 5 corresponding to the right position of the direct drive head frame 3. The front part of the upper side of the mounting platform 10 is inclined upward relative to the rear part. The tailstock assembly includes a tailstock adjustment seat 15 and a tailstock body 14. The tailstock body 14 is provided on the upper right side of the mounting platform 10. The tailstock adjustment seat 15 with a 7-shaped lower side is installed on the upper right side of the mounting platform 10. The upper side of the tailstock adjustment seat 15 is installed together with the lower side of the tailstock body 14.

[0049] According to the requirements, the tailstock body 14 is a known technology. A screw and nut pair is installed between the tailstock adjusting seat 15 and the tailstock body 14 to move the tailstock body 14 back and forth. The tailstock body 14 has U-shaped connecting grooves that are vertically connected and open outward on both the left and right sides. The mounting platform 10 has a fixing groove that is open upward and horizontally connected on the left side. The fixing groove is T-shaped, narrow at the top and wide at the bottom. Each connecting groove has a T-bolt with its lower end located in the wide diameter section of the fixing groove. Each T-bolt has a nut screwed to its upper end. This arrangement facilitates the movement and fixing of the tailstock body 14.

[0050] During use, the front of the upper side of the mounting platform 10 is tilted upward relative to the rear, which facilitates the installation of the tailstock assembly. When the tailstock assembly and the direct drive headstock 3 are installed with the workpiece to be processed, the grinding assembly can be moved back and forth to process the inner and outer walls of various diameters. This reduces the number of moving steps of the grinding assembly, reduces the error during the movement process, and thus improves the accuracy of the workpiece to be processed.

[0051] Example 6: As an optimization of the above examples, as shown in the appendix. Figures 1 to 6 As shown, a sliding plate 19 with a 7-shaped lower side is installed on the upper left side of the mounting platform 10, and a center frame 20 is fixedly installed on the right side of the sliding plate 19. Depending on the requirements, the center frame 20 can be a known hydraulic or pneumatic center frame. When machining slender shaft and tube parts, it can ensure the coaxiality of the workpiece and meet the radial runout requirements. The sliding plate 19 has a 7-shaped lower side and a horizontal upper side, facilitating its installation and improving the stability of the center frame 20. It also improves the accuracy of the tailstock body 14 and the center frame 20. Furthermore, this design facilitates chip removal, preventing grinding debris from accumulating on the guide rails and affecting the accuracy of the workpiece.

[0052] Example 7: As an optimization of the above examples, as shown in the appendix. Figures 1 to 6 As shown, the drive mechanism includes a mounting base 21, a third drive motor 31, and a gear ring 23. The left side of the fixed base 4, which is located to the left of the left guide rail 6, has a stepped surface 24. An arc-shaped gear ring 23 with an inward opening and coaxial with the left guide rail 6 is fixedly installed on the upper side of the stepped surface 24. The mounting base 21 is installed on the left side of the support base 5. The third drive motor 31 is fixedly installed on the mounting base 21. A transmission gear 25 that meshes with the outer side of the gear ring 23 is fixedly installed at the lower end of the output shaft of the third drive motor 31.

[0053] According to the requirements, the third drive motor 31 is a known technology, such as a servo motor of the S08-AM3 series, and the transmission gear 25 is a known backlash-free gear. This can not only improve the rotation accuracy of the support 5 and facilitate the positioning of the workpiece to be processed, but also reduce the noise when the support 5 rotates and improve the working environment. When the third drive motor 31 is working, it can drive the transmission gear 25 to rotate, so that the transmission gear 25 and the outer side of the gear ring 23 rotate relative to each other, thereby making the support 5 rotate in the circumferential direction on the left guide rail 6 and the right guide rail 8.

[0054] Example 8: As an optimization of the above examples, as shown in the appendix Figure 1 As shown, it also includes a hydraulic rotary table 26, which is installed between the upper side of the fixed base 4 and the lower side of the support base 5. According to requirements, the hydraulic rotary table 26 is a known prior art technology. A photoelectric servo motor encoder (model ZKD-86-1000BM / 4P-G05L) for detecting the rotation angle is installed at the lower end of the hydraulic rotary table 26. This arrangement allows the support base 5 to rotate along the center of the hydraulic rotary table 26 on the left guide rail 6 and the right guide rail 8, reducing the load on the third drive motor 31, and also improving the rotational accuracy of the support base 5, thereby enhancing machining accuracy.

[0055] Example 9: As an optimization of the above embodiments, as shown in the appendix Figures 1 to 6 As shown in Figures 8 and 9, the system also includes a circulating pump 42 and a control unit. The base 1 is a mineral casting base. A conveying auger is installed in the mounting groove 17 between the fixed base 4 and the cross slide 2. A chip removal hole 18 communicating with the mounting groove 17 is provided on the right side of the base 1 corresponding to the outlet of the conveying auger. A U-shaped cooling channel 38 with a rearward opening is provided on the lower inner side of the base 1 below the mounting groove 17. Both ends of the cooling channel 38 extend to the rear side of the base 1. A water inlet pipe 39 is fixedly connected to the first end of the cooling channel 38. The second end of the cooling channel 38 is fixedly connected to the water inlet of the circulating pump 42. A water outlet pipe 40 is fixedly connected to the water outlet of the circulating pump 42. The front left side of the base 1 corresponding to the front of the cooling channel 38... Two downward-facing fixing holes 41 are provided on the right side, and a temperature sensor is sealed and fixedly installed in each fixing hole 41. A front proximity switch 11 and a rear proximity switch 12 are fixedly installed on the upper side of the fixing seat 4 corresponding to the right position of the right guide rail 8, with a front and rear gap. A sensing block 13 fixedly installed on the right side of the support seat 5 is provided between the front proximity switch 11 and the rear proximity switch 12. The front proximity switch 11, the rear proximity switch 12 and each temperature sensor are connected to the control unit. The control unit is connected to the first drive motor 22, the second drive motor 29, the third drive motor 31, the positioning cylinder 36, the grinding wheel dressing device 35, the lifting motor 33, the cross slide 2, the threaded helix device 16, the conveying auger and the circulating pump 42 respectively.

[0056] According to the requirements, the temperature sensor, conveying auger, front proximity switch 11 and rear proximity switch 12 are all existing known technologies. The control unit is an existing known programmable controller or 630TA CNC system. The mineral casting base 1 has high rigidity, good thermal stability and vibration absorption performance. In use, the water inlet pipe 39 and water outlet pipe 40 are connected to the cooling water pipeline, which can cool the base 1 and improve the thermal stability of the base 1, thereby improving the machining accuracy of the parts. The setting of the conveying auger makes it easy for the grinding chips to be discharged from the mounting groove 17 through the chip discharge hole 18 in a timely manner, avoiding wear on the equipment.

[0057] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A composite grinding machine for internal and external threads, characterized in that... The assembly includes a base, a direct-drive headstock, a tailstock assembly, a corner drive assembly, a grinding assembly, and a corner lifting assembly. The base has a mounting slot on its upper side. A direct-drive headstock for clamping the workpiece is located in front of the mounting slot. A tailstock assembly for pressing the end of the workpiece is located to the right of the direct-drive headstock. A corner drive assembly that allows the direct-drive headstock and tailstock assembly to rotate in the same direction is located inside the front part of the mounting slot. A grinding assembly for grinding the external and internal threads of the workpiece is located behind the corner drive assembly. A corner lifting assembly that allows the grinding assembly to move left and right, forward and backward, and swing up and down on its left side is located inside the rear part of the mounting slot. Wherein: The corner drive assembly includes a fixed base, a support base, a left guide rail, a right guide rail, and a drive mechanism. The lower side of the fixed base is fixedly installed on the inner front side of the mounting groove. The support base is installed above the fixed base. An arc-shaped left guide rail with an opening to the right is fixedly installed on the upper left side of the fixed base. At least one left slider is slidably installed on the upper part of the left guide rail along the circumferential direction. The upper side of each left slider is fixedly installed with the corresponding position on the lower left side of the support base. A right guide rail that is centrally symmetrical with the left guide rail is fixedly installed on the upper right side of the fixed base. At least one right slider is slidably installed on the upper part of the right guide rail along the circumferential direction. The upper side of each right slider is fixedly installed with the corresponding position on the lower right side of the support base. The right side of the fixed base is provided with a drive mechanism that drives the support base to slide along the left and right guide rails. The direct drive head frame is fixedly installed on the upper left side of the support base, and the tailstock assembly is installed on the upper right side of the support base. The corner lifting assembly includes a cross slide and a threaded lifting device. The cross slide is installed on the inner side of the mounting groove corresponding to the rear position of the fixed base. The upper side of the cross slide and the lower side of the threaded lifting device are mounted together. The front side of the threaded lifting device is mounted together with the grinding assembly. The grinding assembly includes a fixed frame, a connecting seat, a first drive motor, a first grinding wheel, a second drive motor, a second grinding wheel, and a lifting motor. The rear side of the fixed frame is fixedly mounted together with the front side of the threaded lifting device. The first drive motor is fixedly mounted on the lower right side of the fixed frame. A lifting motor is fixedly mounted on the outer side of the left end of the output shaft of the first drive motor. The first grinding wheel for grinding external threads has a lifting motor fixedly installed on the upper right side of the fixed frame above the first drive motor. A rotating sleeve is fixedly installed on the outer left side of the output shaft of the lifting motor. The outer side of the rotating sleeve is rotatably installed together with the front of the fixed frame. The outer side of the middle part of the rotating sleeve is fixedly installed together with the rear side of the connecting seat. A second drive motor is installed at the front of the connecting seat. A second grinding wheel for grinding internal threads is fixedly installed on the outer left side of the output shaft of the second drive motor. A grinding wheel dressing device for dressing the first grinding wheel and the second grinding wheel is provided on the upper side of the support seat corresponding to the position behind the direct drive head. The grinding assembly also includes a positioning cylinder and a hinge seat. The positioning cylinder is hinged to the upper side of the threaded helix device at the rear position of the rotating sleeve, and the hinge seat is fixedly installed on the upper side of the connecting seat at the front position of the rotating sleeve. The front end of the piston rod of the positioning cylinder is hinged to the hinge seat.

2. The internal and external thread composite grinding machine according to claim 1, characterized in that... A mounting platform is fixed on the upper side of the support base corresponding to the right position of the direct drive head frame. The front part of the upper side of the mounting platform is tilted upward relative to the rear part. The tailstock assembly includes a tailstock adjustment seat and a tailstock body. The tailstock body is located on the upper right side of the mounting platform. A tailstock adjustment seat with a 7-shaped lower side is installed on the upper right side of the mounting platform. The upper side of the tailstock adjustment seat is installed together with the lower side of the tailstock body.

3. The internal and external thread composite grinding machine according to claim 2, characterized in that... A 7-shaped sliding plate is installed on the upper left side of the mounting platform, and a center frame is fixedly installed on the right side of the sliding plate.

4. The internal and external thread composite grinding machine according to claim 1, 2, or 3, characterized in that... The drive mechanism includes a mounting base, a third drive motor, and a gear ring. The left side of the fixed base corresponding to the left position of the left guide rail has a stepped surface. An arc-shaped gear ring with an inward opening and coaxial with the left guide rail is fixedly installed on the upper side of the stepped surface. A mounting base is installed on the left side of the support base. The third drive motor is fixedly installed on the mounting base. A transmission gear that meshes with the outer side of the gear ring is fixedly installed at the lower end of the output shaft of the third drive motor. Or / and, it also includes a hydraulic turntable. A hydraulic turntable is installed between the upper side of the fixed base and the lower side of the support base.

5. The internal and external thread composite grinding machine according to claim 4, characterized in that... It also includes a circulating pump and a control unit. The base is a mineral casting base. A conveying auger is installed in the mounting groove between the fixed seat and the cross slide. A chip removal hole communicating with the mounting groove is provided on the right side of the base corresponding to the outlet of the conveying auger. A U-shaped cooling channel with a rearward opening is provided on the inner side of the lower part of the base corresponding to the mounting groove. Both ends of the cooling channel extend to the rear side of the base. The first end of the cooling channel is fixedly connected to a water inlet pipe, and the second end of the cooling channel is fixedly connected to the water inlet of the circulating pump. The water outlet of the circulating pump is fixedly connected to an outlet pipe. The front left and right sides of the base corresponding to the front of the cooling channel... Two downward-facing fixing holes are provided, and a temperature sensor is sealed and fixedly installed in each fixing hole. A front proximity switch and a rear proximity switch are fixedly installed at intervals on the upper side of the fixing seat corresponding to the right position of the right guide rail. A sensing block fixedly installed on the right side of the support base is provided between the front proximity switch and the rear proximity switch. The front proximity switch, the rear proximity switch, and each temperature sensor are all connected to the control unit. The control unit is connected to the first drive motor, the second drive motor, the third drive motor, the positioning cylinder, the grinding wheel dressing device, the lifting motor, the cross slide, the threaded helix device, the conveying auger, and the circulating pump.

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