Planetary roller screw thread roller tooth part and thread combined grinding device and method

Abstract

The invention discloses a planetary roller screw thread roller tooth part and thread combined grinding device and method, a Z-axis moving mechanism is movably mounted at the front part of a lathe bed, the Z-axis moving mechanism comprises a headstock and a tailstock, and a workpiece is mounted between the headstock and the tailstock in a propping manner; an X-axis moving mechanism is movably installed behind the machine body and connected with a Y-axis moving mechanism through a stand column. The Y-axis moving mechanism is movably connected with the A-axis rotating mechanism, and the A-axis rotating mechanism can rotate around the X axis; and grinding heads which are staggered in the upper, lower, left and right directions are sequentially integrated on the A-axis rotating mechanism. According to the device, the tooth part helical angle and the thread lead angle of the tooth part grinding head and the thread grinding head can be changed respectively, so that the device is more reasonable. The tailstock is provided with an automatic jacking device to jack the workpiece, and automatic batch machining of parts is facilitated. And more importantly, the switching of grinding functions is realized through a rotary mechanism, the change of a tooth helical angle and a lead angle during part machining is also realized, and the device is high in integration degree and wide in application range.

Description

Technical Field

[0001] The invention belongs to the technical field of composite grinding devices, and in particular relates to a planetary roller screw thread roller tooth portion and thread joint grinding device, and also relates to a planetary roller screw thread roller tooth portion and thread joint grinding method. Background Art

[0002] Gear grinding is a high-precision gear processing method, mainly used for fine processing of the tooth profile of hardened gears, aiming to improve the accuracy and surface finish of the gears. Gear grinding is mainly divided into two methods: forming method and generating method. The generating method gear grinding device has high processing accuracy and efficiency and is widely used. Compared with the generating method gear grinding device, the forming method gear grinding device has no generating motion, simple structure, and is more convenient to control and adjust.

[0003] Thread grinding is a high-precision thread processing method, mainly used for precision thread processing of hardened workpieces, aiming to improve the accuracy and surface finish of the thread. According to the different cross-sectional shapes of the grinding wheel, it is divided into two types: single-line grinding wheel grinding and multi-line grinding wheel grinding. Among them, single-line grinding wheel grinding has high precision and convenient grinding wheel dressing. Multi-line grinding wheel grinding has high production efficiency, but low precision and complex grinding wheel dressing.

[0004] For the typical parts planetary roller screw thread roller processing method, the main process steps are: blank - heat treatment - straightening - end face and center hole processing - rough turning - aging - end face and center hole processing - semi-finishing turning - gear hobbing - milling - rough grinding - nitriding - center hole grinding - rough grinding - flaw detection - aging - center hole grinding - semi-finishing grinding - aging - milling keyway - end thread grinding - center hole grinding - fine grinding - inspection. This process requires a variety of special equipment, many processes, high labor intensity, high production management costs and long cycles. Figure 1 At present, for the finishing of the teeth and threads of parts, two or three devices are usually used for gear grinding, rough thread grinding and fine thread grinding, that is, a gear grinding device, at least one device with rough grinding and fine thread grinding, or one rough thread grinding device and one fine thread grinding device are required, which has high production costs and long production cycles. Therefore, based on the above situation, a tooth and thread combined grinding device is invented, which integrates the tooth grinding and thread grinding in the process into one device, and the grinding of the teeth and threads of parts can be completed in one clamping, which greatly saves processing time and processing costs. Summary of the invention

[0005] The purpose of the present invention is to provide a planetary roller screw thread roller tooth and thread combined grinding device, which solves the problem that the existing parts tooth and thread grinding usually uses more than two devices for tooth grinding, rough grinding and fine grinding.

[0006] Another object of the present invention is to provide a combined grinding method for the roller tooth portion and thread of a planetary roller screw thread.

[0007] The first technical solution adopted by the present invention is: a planetary roller screw thread roller tooth part and thread joint grinding device, comprising a bed, a Z-axis moving mechanism is movably installed at the front of the bed, a Z-axis support plate is connected to the Z-axis moving mechanism, a tailstock support plate is connected to the Z-axis support plate, a headstock is installed on the Z-axis support plate by bolts, and a tailstock is installed on the tailstock support plate by bolts; a workpiece is tightly installed between the headstock and the tailstock;

[0008] An X-axis moving mechanism is movably installed behind the bed body, and the X-axis moving mechanism is connected to the Y-axis moving mechanism through a column; the Y-axis moving mechanism is movably connected to the A-axis rotating mechanism through a Y-axis support plate, and the A-axis rotating mechanism can rotate around the X-axis; a grinding head assembly is integrated at one end of the A-axis rotating mechanism facing the Z-axis moving mechanism.

[0009] The present invention is also characterized in that:

[0010] Preferably, the grinding head assembly comprises a thread grinding head I, a thread grinding head II, a tooth grinding head I, and a tooth grinding head II, and the four grinding heads are alternately arranged in four directions, up, down, left, and right.

[0011] Preferably, the X-axis moving mechanism is connected to an X-axis support plate, the column is fixed on the X-axis support plate, and the Y-axis moving mechanism can move up and down along the column.

[0012] Preferably, the Y-axis moving mechanism comprises a Y-axis servo motor, a coupling, a lead screw, and two linear ball guide rails fixed on the column; the Y-axis servo motor is connected to the lead screw through the coupling; a lead screw nut is sleeved on the lead screw; a connecting seat is mounted on the lead screw nut through bolts; a Y-axis support plate is fixedly mounted on the connecting seat and fixedly connected to a supporting mounting seat of an A-axis rotating mechanism; the A-axis rotating mechanism comprises a rotating shaft rotating about the X direction; the rotating shaft is movably connected to the supporting mounting seat through a bearing A; and the A-axis rotating mechanism is driven by a motor;

[0013] The two Y-axis linear ball guides are used to support and guide the A-axis rotating mechanism, the thread grinding head and the gear grinding head. The two linear ball guides are symmetrically arranged along the center of the column.

[0014] Preferably, the tailstock is fixed on the tailstock support plate, the tailstock comprises a tailstock slide plate slidably connected to the tailstock support plate, a tailstock guide rail seat is connected to the tailstock slide plate by bolts, the oil cylinder is connected to the tailstock guide rail seat by bolts, the tailstock guide rail seat is movably connected to a slide seat along the guide rail, a top seat is fixed on the slide seat, and a tailstock top is arranged on the top seat close to the headstock on one side;

[0015] Preferably, the cylinder push rod is connected to the slide by a nut, and the cylinder push rod can push the slide to move along the Z-axis direction, thereby driving the tailstock top to tighten the workpiece.

[0016] Preferably, the tailstock top corresponds coaxially to the C-axis rotating mechanism.

[0017] Preferably, the headstock includes a C-axis driving mechanism, which is connected to a C-axis rotating mechanism support. The C-axis driving mechanism includes a fixed part connected to the C-axis rotating mechanism support and a rotating part driven by a motor. The central axis B has an interference fit with the inner ring of the bearing A, and the outer ring of the bearing A has a clearance fit with the fixed part of the C-axis driving mechanism. A headstock top is provided at one end of the central axis B away from the C-axis rotating mechanism support. The headstock top is opposite to the tailstock top and is used to tighten the workpiece.

[0018] The central axis B is also provided with an encoder, which can realize precise positioning of the C axis; the central axis is arranged along the Z direction, and the central axis B is driven to rotate around the Z axis by a torque motor.

[0019] As a preferred embodiment, the thread grinding head I and the thread grinding head II have the same structure, are connected to the A-axis rotating mechanism through the main shaft and the support, and the axis angles of the thread grinding head I and the thread grinding head II differ by 90 degrees;

[0020] Preferably, thread grinding head I adopts a multi-wire grinding wheel integrated in the front of the spindle, or a single-wire and multi-wire grinding wheel; thread grinding head II adopts a single-wire grinding wheel integrated in the front of the spindle; the multi-wire grinding wheel is used for rough grinding of the workpiece thread, and the single-wire grinding wheel is used for fine grinding of the workpiece thread.

[0021] Preferably, the gear grinding head I and the gear grinding head II have the same structure, including a tool holder installed in the main shaft, and the front end fixes the gear grinding wheel therein through a grinding wheel fixing seat; the gear grinding head I and the gear grinding head II are connected to the A-axis rotating mechanism through the main shaft and the support, and the axis angles of the gear grinding head I and the gear grinding head II differ by 90 degrees.

[0022] Preferably, the Z-axis support plate is fixedly mounted on the Z-axis moving mechanism, serving as a fixed mounting seat for the headstock and tailstock support plates, and acting as a transition connecting plate. The Y-axis support plate is fixedly mounted on the connecting seat, serving as a supporting mounting seat for the A-axis rotating mechanism, and acting as a transition connecting plate. The X-axis support plate is fixedly mounted on the X-axis moving mechanism, serving as a column supporting mounting seat, and acting as a transition connecting plate. The C-axis drive mechanism support is connected to the Z-axis support plate by bolts, serving as a C-axis drive mechanism mounting support seat, and acting as a transition connection; the A-axis rotating mechanism is placed on the Y-axis support plate, rotates around the X-axis, and serves as a mounting seat for the thread grinding head I, thread grinding head II, tooth grinding head I, and tooth grinding head II, and acting as a transition connection.

[0023] The Z-axis moving mechanism drives the workpiece to move left and right, the Y-axis and Z-axis moving mechanisms perform interpolation motion to achieve the centering of the workpiece and the grinding wheel, and the X-axis moving mechanism drives the grinding head to achieve feed motion. The tooth and thread of the part are machined using the generating method, and the tooth and thread grinding of the part can be completed in one clamping.

[0024] Preferably, the Z-axis moving mechanism of the present invention includes a Z-axis linear motor and a Z-axis linear ball guide; two Z-axis linear ball guides are used to support and guide the headstock, tailstock, Z-axis support plate and the workpiece to be processed, and the two Z-axis linear ball guides are symmetrically arranged along the Z-axis linear motor. The Z-axis linear motor is composed of a primary and a secondary part, the secondary part is fixed on the bed, and the primary part is movable on the Z-axis support plate. At the same time, the primary and secondary parts use a cooler and a heat dissipation device to take away the heat generated during the operation of the Z-axis linear motor to prevent the temperature from rising.

[0025] Preferably, the X-axis moving mechanism of the present invention comprises an X-axis linear motor and an X-axis linear ball guide. The two X-axis linear ball guides are used to support and guide the column, and the X-axis linear motor is composed of a primary and a secondary part, the secondary part is fixed on the bed, and the primary part moves on the X-axis support plate. At the same time, the primary and secondary parts use a cooler and a heat dissipation device to take away the heat generated during the operation of the X-axis linear motor to prevent the temperature from rising.

[0026] The second technical solution adopted by the present invention is: a method for combined grinding of the roller teeth and threads of a planetary roller screw thread, which uses the rotation of the A-axis rotating mechanism to drive the tooth grinding head and the thread grinding head to rotate to achieve grinding head switching, and can change the tooth helix angle and thread lead angle respectively at the same time, and realize the alignment of the workpiece tooth or thread part with the grinding wheel through Z-axis and Y-axis interpolation movement, and the X-axis moving mechanism is a feeding mechanism, and the tooth grinding and thread grinding are completed by the generation method. The specific operation steps are as follows:

[0027] Step 1: The axes of the device are in the initial position, and the tailstock slide is manually adjusted so that the distance between the headstock top and the tailstock top is greater than the total length of the workpiece by 30-50mm. The workpiece is placed in the clamping position, and the oil cylinder is oiled. The oil cylinder push rod pushes the slide and the top seat to move along the negative direction of the Z axis through the connecting plate, and the two tops press the workpiece tightly;

[0028] Step 2: Grinding the teeth of the workpiece;

[0029] The A-axis rotating mechanism rotates clockwise and switches to the gear grinding head I, so that the grinding wheel axis of the gear grinding head I is parallel to the Y-axis, and the gear helix angle is deflected at the same time. The workpiece gear and the grinding wheel are aligned through the interpolation movement of the Z-axis and the Y-axis. The X-axis moving mechanism is a feeding mechanism, and the gear rough grinding is completed by the generating method; the A-axis rotating mechanism rotates clockwise and switches to the gear grinding head II, so that the grinding wheel axis of the gear grinding head II is parallel to the Y-axis, and the gear helix angle is deflected at the same time. The workpiece gear and the grinding wheel are aligned through the interpolation movement of the Z-axis and the Y-axis. The X-axis moving mechanism is a feeding mechanism, and the gear fine grinding is completed by the generating method;

[0030] Step 3: Grinding the threaded part of the workpiece;

[0031] If the workpiece thread length is short, the thread grinding head I can be used to complete the rough and fine grinding of the workpiece thread. The A-axis rotating mechanism rotates clockwise to switch to the thread grinding head I, so that the grinding wheel axis of the thread grinding head I is parallel to the Z axis, and the thread lead angle is deflected at the same time. The thread and the grinding wheel are aligned through the Z-axis and Y-axis interpolation movement. The X-axis moving mechanism is the feeding mechanism, and the thread rough and fine grinding is completed at one time using the generation method;

[0032] If the workpiece thread length is long, thread grinding head I and thread grinding head II are used to complete the rough and fine grinding of the thread respectively. The A-axis rotating mechanism rotates clockwise and switches to thread grinding head I, so that the grinding wheel axis of thread grinding head I is parallel to the Z axis, and the thread lead angle is deflected at the same time. The thread and grinding wheel are aligned through the Z-axis and Y-axis interpolation motions. The X-axis moving mechanism is the feeding mechanism, and the generation method is used to complete the rough grinding of the thread. The A-axis rotating mechanism rotates clockwise and switches to thread grinding head II, so that the grinding wheel axis of thread grinding head II is parallel to the Z axis, and the thread lead angle is deflected at the same time. The thread and grinding wheel are aligned through the Z-axis and Y-axis interpolation motions. The X-axis moving mechanism is used as the feeding mechanism, and the generation method is used to complete the fine grinding of the thread.

[0033] The beneficial effects of the present invention are:

[0034] 1. All linear axes and rotary axes of the present invention adopt full closed-loop control, with high positioning accuracy and repeat positioning accuracy. When switching different grinding heads and adjusting the helix angle and thread lead angle of the tooth, the grinding accuracy will not be reduced due to excessive rotation error.

[0035] 2. The present invention integrates the tooth grinding head and the thread grinding head into one device, which has a high degree of integration and can greatly save processing costs and time costs.

[0036] 3. The tailstock of the present invention is adjustable, and the tailstock can control the clamping of parts through oil pressure, and has automation capability for mass production of parts.

[0037] 4. The present invention has an A-axis rotation that can adjust the tooth helix angle and thread lead angle, and has the ability to process helical teeth and different thread lead angles, so its processing range is wide.

[0038] In summary, the present invention has reasonable structural design, high overall machine integration, wide processing range, high positioning and repeat positioning accuracy of each linear axis and rotary axis, and can be promoted for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic structural diagram of a planetary roller screw thread roller compound grinding machine device of the present invention;

[0040] Figure 2 It is a schematic diagram of the threaded roller structure of the planetary roller screw of the present invention;

[0041] Figure 3 It is a partial view of the hidden Y-axis carriage and A-axis rotation mechanism;

[0042] Figure 4 It is a top view of the planetary roller screw thread roller compound grinding machine device of the present invention;

[0043] Figure 5 yes Figure 4 AA section view;

[0044] Figure 6 yes Figure 4 P-direction tailstock side view;

[0045] Figure 7 It is a three-dimensional diagram of the tailstock of the present invention;

[0046] Figure 8 It is a schematic diagram of the workpiece tooth grinding method of the present invention;

[0047] FIG9( a ) is a schematic diagram of a method for rough grinding of workpiece threads according to the present invention;

[0048] FIG9( b ) is a schematic diagram of a workpiece thread finishing method according to the present invention;

[0049] FIG. 9( c ) is a schematic diagram of the workpiece thread rough grinding + fine grinding method of the present invention.

[0050] In the figure, 1. bed, 2. column, 3. Z-axis moving mechanism, 4. Z-axis support plate, 5. headstock, 6. tailstock, 7. tailstock support plate, 8. Y-axis moving mechanism, 9. Y-axis support plate, 10. X-axis moving mechanism, 11. X-axis support plate, 12. A-axis rotating mechanism, 12-1. support mounting seat, 12-2. rotating shaft, 12-3. bearing A, 13. thread grinding head I, 14. thread grinding head II, 15. gear grinding head I, 16. gear grinding Cutting head II, 17. Workpiece, 18. Coupling, 19. Screw, 20. Screw nut, 21. Connecting seat, 5-1. C-axis drive mechanism support, 5-2. C-axis drive mechanism, 5-3. Bearing B, 5-4. Center shaft B, 5-5. Headstock center, 6-1. Tailstock slide, 6-2. Tailstock guide seat, 6-3. Slide, 6-4. Center seat, 6-5. Tailstock center, 6-6. Cylinder, 6-7. Cylinder push rod, 6-8. Connecting plate. DETAILED DESCRIPTION

[0051] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0052] Example 1

[0053] The planetary roller screw thread roller tooth portion and thread joint grinding device of the present invention has a structure as follows Figure 1 , Figure 4 As shown, it includes a bed 1, a Z-axis moving mechanism 3 is movably installed at the front of the bed 1, a Z-axis support plate 4 is connected to the Z-axis moving mechanism 3, a tailstock support plate 7 is connected to the Z-axis support plate 4, a headstock 5 is installed on the Z-axis support plate 4 by bolts, and a tailstock 6 is installed on the tailstock support plate 7 by bolts; a workpiece 17 (such as Figure 2 As shown) is tightly installed between the head frame 5 and the tail frame 6;

[0054] An X-axis moving mechanism 10 is movably installed at the rear of the bed 1, and the X-axis moving mechanism 10 is connected to the Y-axis moving mechanism 8 through the column 2; the Y-axis moving mechanism 8 is movably connected to the A-axis rotating mechanism 12 through the Y-axis support plate 9, and the A-axis rotating mechanism 12 can rotate around the X-axis; a grinding head assembly is integrated at one end of the A-axis rotating mechanism 12 facing the Z-axis moving mechanism 3.

[0055] The grinding head assembly comprises a thread grinding head I 13, a thread grinding head II 14, a tooth grinding head I 15, and a tooth grinding head II 16. The four grinding heads are alternately arranged in four directions, namely, up, down, left, and right.

[0056] The X-axis moving mechanism 10 is connected to an X-axis support plate 11, the column 2 is fixed on the X-axis support plate 11, and the Y-axis moving mechanism 8 can move up and down along the column 2.

[0057] like Figure 3As shown, the Y-axis moving mechanism 8 includes a Y-axis servo motor fixed on the column 2, the Y-axis servo motor is connected to the screw 19 through a coupling 18, the screw 19 is sleeved with a screw nut 20, the connecting seat 21 is installed on the screw nut 20 through bolts, the Y-axis support plate 9 is fixedly installed on the connecting seat 21 and fixedly connected to the support mounting seat 12-1 of the A-axis rotating mechanism 12, the A-axis rotating mechanism 12 includes a rotating shaft 12-2 around the X-direction, the rotating shaft 12-2 is movably connected to the supporting mounting seat 12-1 through a bearing A12-3, and the A-axis rotating mechanism 12 is driven by a motor.

[0058] like Figure 5 As shown, the head frame includes a C-axis driving mechanism 5-2, which is connected to the C-axis rotating mechanism support 5-1. The C-axis driving mechanism 5-2 includes a fixed part connected to the C-axis rotating mechanism support 5-1 and a rotating part center axis B5-4 driven by a motor; the center axis B5-4 has an interference fit with the inner ring of the bearing B5-3, and the outer ring of the bearing B5-3 has a clearance fit with the fixed part of the C-axis driving mechanism. A head frame top 5-5 is provided at one end of the center axis B5-4 away from the C-axis rotating mechanism support 5-1. The head frame top 5-5 is opposite to the tail frame top 6-5 and is used to tighten the workpiece 17.

[0059] like Figure 6-7 As shown, the tailstock 6 is fixed on the tailstock bracket 7, and the tailstock 6 includes a tailstock slide plate 6-1 slidably connected to the tailstock bracket 7, a tailstock guide rail seat 6-2 is connected to the tailstock slide plate 6-1 by bolts, an oil cylinder 6-6 is connected to the tailstock guide rail seat 6-2 by bolts, a slide seat 6-3 is movably connected to the tailstock guide rail seat 6-2 along the guide rail, a top seat 6-4 is fixed on the slide seat 6-3, and a tailstock top seat 6-5 is arranged on the top seat 6-4 near the headstock side;

[0060] The cylinder push rod 6-7 is connected to the slide 6-3 through a nut. The cylinder push rod 6-7 can push the slide 6-3 to move along the Z-axis direction, thereby driving the tailstock top 6-5 to tighten the workpiece.

[0061] The tailstock top 6-5 corresponds coaxially to the C-axis rotating mechanism.

[0062] An encoder is also provided on the central axis B5-4, which can realize precise positioning of the C-axis; the central axis B5-4 is arranged along the Z direction and is driven by a motor to rotate around the Z axis.

[0063] The thread grinding head I13 and the thread grinding head II14 have the same structure and are connected to the A-axis rotating mechanism 12 through the main shaft and the support. The axis angles of the thread grinding head I13 and the thread grinding head II14 differ by 90 degrees.

[0064] The thread grinding head Ⅰ13 adopts a multi-line grinding wheel integrated in the front of the spindle, or a single-line and multi-line grinding wheel; the thread grinding head Ⅱ14 adopts a single-line grinding wheel integrated in the front of the spindle; the multi-line grinding wheel is used for rough grinding of the workpiece thread, and the single-line grinding wheel is used for fine grinding of the workpiece thread.

[0065] The structures of the gear grinding head I15 and the gear grinding head II16 are consistent, including a tool handle installed in the main shaft, and the front end fixes the gear grinding wheel therein through a grinding wheel fixing seat; the gear grinding head I15 and the gear grinding head II16 are connected to the A-axis rotating mechanism 12 through the main shaft and the support, and the axis angles of the gear grinding head I15 and the gear grinding head II16 differ by 90 degrees.

[0066] Example 2

[0067] The use state of the device of the present invention is that the tooth grinding is as follows Figure 8 As shown, the rough grinding and fine grinding are separated, the rough grinding uses a multi-line grinding wheel, and the fine grinding uses a single-line grinding wheel; the thread grinding method is as follows Figure 9(a)-Figure 9(c) As shown, if the threaded portion is long, coarse grinding (as shown in Figure 9(a)) and fine grinding (as shown in Figure 9(b)) are adopted separately, a multi-line grinding wheel is used for coarse grinding, and a single-line grinding wheel is used for fine grinding. Thread grinding head I is used for coarse grinding of threads, and thread grinding head II is used for fine grinding of threads. This can solve the problem of integrating two types of grinding wheels for coarse grinding and fine grinding on one grinding head, and the overhang of the grinding head shaft is too long, which affects the rigidity of the grinding head. If the threaded portion is short, a combination of coarse grinding and fine grinding is adopted (as shown in Figure 9(c)). Two types of grinding wheels for coarse grinding and fine grinding are integrated on thread grinding head I. There is no need to switch the grinding head. One grinding head can realize coarse grinding and fine grinding of threads, thereby achieving efficient thread grinding.

[0068] Example 3

[0069] The present invention is used for the combined grinding method of the roller tooth portion and the thread of a planetary roller screw, and the specific operation steps are as follows:

[0070] Step 1: The axes of the device are in the initial position, and the tailstock slide is manually adjusted so that the distance between the headstock top and the tailstock top is greater than the total length of the workpiece by 30-50mm. The workpiece is placed in the clamping position, and the oil cylinder is oiled. The oil cylinder push rod pushes the slide and the top seat to move along the negative direction of the Z axis through the connecting plate, and the two tops press the workpiece tightly;

[0071] Step 2: Grinding the teeth of the workpiece;

[0072] The A-axis rotating mechanism rotates clockwise and switches to the gear grinding head I, so that the grinding wheel axis of the gear grinding head I is parallel to the Y-axis, and the gear helix angle is deflected at the same time. The workpiece gear and the grinding wheel are aligned through the interpolation movement of the Z-axis and the Y-axis. The X-axis moving mechanism is a feeding mechanism, and the gear rough grinding is completed by the generating method; the A-axis rotating mechanism rotates clockwise and switches to the gear grinding head II, so that the grinding wheel axis of the gear grinding head II is parallel to the Y-axis, and the gear helix angle is deflected at the same time. The workpiece gear and the grinding wheel are aligned through the interpolation movement of the Z-axis and the Y-axis. The X-axis moving mechanism is a feeding mechanism, and the gear fine grinding is completed by the generating method;

[0073] Step 3: Grinding the threaded part of the workpiece;

[0074] If the length of the threaded part of the workpiece is short, the thread grinding head I can be used to complete the rough and fine grinding of the workpiece thread. The A-axis rotating mechanism rotates clockwise to switch to the thread grinding head I, so that the grinding wheel axis of the thread grinding head I is parallel to the Z axis, and the thread lead angle is deflected at the same time. The thread and the grinding wheel are aligned through the Z-axis and Y-axis interpolation movement. The X-axis moving mechanism is the feeding mechanism, and the thread rough and fine grinding is completed at one time using the generation method;

[0075] If the threaded portion of the workpiece is long, thread grinding head I and thread grinding head II are used to complete the rough and fine grinding of the thread respectively. The A-axis rotating mechanism rotates clockwise and switches to thread grinding head I, so that the grinding wheel axis of thread grinding head I is parallel to the Z axis, and the thread lead angle is deflected at the same time. The thread and grinding wheel are aligned through the Z-axis and Y-axis interpolation movements. The X-axis moving mechanism is a feeding mechanism, and the generation method is used to complete the rough grinding of the thread. The A-axis rotating mechanism rotates clockwise and switches to thread grinding head II, so that the grinding wheel axis of thread grinding head II is parallel to the Z axis, and the thread lead angle is deflected at the same time. The thread and grinding wheel are aligned through the Z-axis and Y-axis interpolation movements. The X-axis moving mechanism is used as a feeding mechanism, and the generation method is used to complete the fine grinding of the thread.

[0076] The device of the present invention has both the function of tooth grinding and the function of thread grinding. A tooth grinding head and a thread grinding head rotation switching grinding head structure are designed. The mechanism can also realize the tooth grinding head and the thread grinding head to change the tooth helix angle and the thread lead angle respectively, making the device more reasonable. The tailstock is equipped with an automatic tightening device to tighten the workpiece, which is convenient for automatic batch processing of parts. More importantly, a rotary mechanism is used to realize the switching of the grinding function and the change of the tooth helix angle and the thread lead angle during part processing. The device has high integration and a wide range of applications.

Claims

1. Planetary roller screw thread roller tooth and thread joint grinding device, characterized in that: The machine comprises a bed (1), a Z-axis moving mechanism (3) is movably mounted on the front of the bed (1), a Z-axis support plate (4) is connected to the Z-axis moving mechanism (3), a tailstock support plate (7) is connected to the Z-axis support plate (4), a headstock (5) is mounted on the Z-axis support plate (4) by bolts, and a tailstock (6) is mounted on the tailstock support plate (7) by bolts; a workpiece (17) is tightly mounted between the headstock (5) and the tailstock (6); An X-axis moving mechanism (10) is movably installed at the rear of the bed (1); the X-axis moving mechanism (10) is connected to a Y-axis moving mechanism (8) via a column (2); the Y-axis moving mechanism (8) is movably connected to an A-axis rotating mechanism (12) via a Y-axis support plate (9); the A-axis rotating mechanism (12) is capable of rotating around the X-axis; and a grinding head assembly is integrated at one end of the A-axis rotating mechanism (12) facing the Z-axis moving mechanism (3).

2. The planetary roller screw thread roller tooth portion and thread combined grinding device according to claim 1, characterized in that: The grinding head assembly comprises a thread grinding head I (13), a thread grinding head II (14), a tooth grinding head I (15), and a tooth grinding head II (16), and the four grinding heads are arranged alternately in four directions, namely, up, down, left, and right.

3. The planetary roller screw thread roller tooth portion and thread combined grinding device according to claim 1, characterized in that: The X-axis moving mechanism (10) is connected to an X-axis support plate (11), the column (2) is fixed on the X-axis support plate (11), and the Y-axis moving mechanism (8) can move up and down along the column (2). The Y-axis moving mechanism (8) comprises a Y-axis servo motor fixed on the column (2), the Y-axis servo motor is connected to a screw rod (19) through a coupling (18), a screw rod nut (20) is sleeved on the screw rod (19), a connecting seat (21) is mounted on the screw rod nut (20) through bolts, a Y-axis support plate (9) is fixedly mounted on the connecting seat (21) and fixedly connected to a support mounting seat (12-1) of an A-axis rotating mechanism (12), the A-axis rotating mechanism (12) comprises a rotating shaft (12-2) rotating around the X direction, the rotating shaft (12-2) is movably connected to the support mounting seat (12-1) through a bearing A (12-3), and the A-axis rotating mechanism (12) is driven by a motor.

4. The planetary roller screw thread roller tooth portion and thread combined grinding device according to claim 2, characterized in that: The tailstock (6) is fixed on a tailstock support plate (7), the tailstock (6) comprises a tailstock slide plate (6-1) slidably connected to the tailstock support plate (7), the tailstock slide plate (6-1) is connected to a tailstock guide rail seat (6-2) by bolts, the oil cylinder (6-6) is connected to the tailstock guide rail seat (6-2) by bolts, the tailstock guide rail seat (6-2) is movably connected to a slide seat (6-3) along the guide rail, a top seat (6-4) is fixed on the slide seat (6-3), and a tailstock top seat (6-5) is arranged on the top seat (6-4) close to the headstock side; The oil cylinder push rod (6-7) is connected to the slide seat (6-3) through a nut, and the oil cylinder push rod (6-7) can push the slide seat (6-3) to move along the Z-axis direction, thereby driving the tailstock top (6-5) to press against the workpiece; The tailstock top (6-5) corresponds coaxially to the C-axis rotating mechanism.

5. The planetary roller screw thread roller tooth portion and thread combined grinding device according to claim 4, characterized in that: The head frame includes a C-axis driving mechanism (5-2), and the C-axis driving mechanism (5-2) is connected to the C-axis rotating mechanism support (5-1). The C-axis driving mechanism (5-2) includes a fixed part connected to the C-axis rotating mechanism support (5-1) and a rotating part center axis B (5-4) driven by a motor; the center axis B (5-4) and the inner ring of the bearing B (5-3) are interference fit, and the outer ring of the bearing B (5-3) and the fixed part of the C-axis driving mechanism are clearance fit; the end of the center axis B (5-4) away from the C-axis rotating mechanism support (5-1) is provided with a head frame top (5-5), and the head frame top (5-5) is opposite to the tail frame top (6-5) and is used to tighten the workpiece (17).

6. The planetary roller screw thread roller tooth portion and thread combined grinding device according to claim 5, characterized in that: The central axis B (5-4) is also provided with an encoder, which can realize precise positioning of the C axis; the central axis B (5-4) is arranged along the Z direction and is driven by a motor to rotate around the Z axis.

7. The planetary roller screw thread roller tooth portion and thread combined grinding device according to claim 2, characterized in that: The thread grinding head I (13) and the thread grinding head II (14) have the same structure and are connected to the A-axis rotating mechanism (12) through a main shaft and a support. The axis angles of the thread grinding head I (13) and the thread grinding head II (14) differ by 90 degrees. The thread grinding head I (13) adopts a multi-line grinding wheel, or a single-line and multi-line grinding wheel, integrated in the front part of the main shaft; the thread grinding head II (14) adopts a single-line grinding wheel integrated in the front part of the main shaft; the multi-line grinding wheel is used for rough grinding of the workpiece thread, and the single-line grinding wheel is used for fine grinding of the workpiece thread.

8. The planetary roller screw thread roller tooth portion and thread combined grinding device according to claim 2, characterized in that: The gear grinding head I (15) and the gear grinding head II (16) have the same structure, including a tool handle installed in the main shaft, and a front end thereof is fixed with a gear grinding wheel through a grinding wheel fixing seat; The gear grinding head I (15) and the gear grinding head II (16) are connected to the A-axis rotating mechanism (12) via a main shaft and a support, and the axis angles of the gear grinding head I (15) and the gear grinding head II (16) differ by 90 degrees.

9. A combined grinding method for roller teeth and threads of a planetary roller screw, characterized in that: The rotation of the A-axis rotating mechanism is used to drive the tooth grinding head and the thread grinding head to rotate to achieve grinding head switching. At the same time, the tooth helix angle and the thread lead angle can be changed respectively. The tooth or thread part of the workpiece is aligned with the grinding wheel through the Z-axis and Y-axis interpolation movement. The X-axis moving mechanism is the feed mechanism, and the tooth grinding and thread grinding are completed by the expansion method.

10. The combined grinding method for roller teeth and threads of a planetary roller screw according to claim 9, characterized in that: The specific steps are as follows: Step 1: The axes of the device are in the initial position, and the tailstock slide is manually adjusted so that the distance between the headstock top and the tailstock top is greater than the total length of the workpiece by 30-50mm. The workpiece is placed in the clamping position, and the oil cylinder is oiled. The oil cylinder push rod pushes the slide and the top seat to move along the negative direction of the Z axis through the connecting plate, and the two tops press the workpiece tightly; Step 2: Grinding the teeth of the workpiece; The A-axis rotating mechanism rotates clockwise and switches to the gear grinding head I, so that the grinding wheel axis of the gear grinding head I is parallel to the Y-axis, and the gear helix angle is deflected at the same time. The workpiece gear and the grinding wheel are aligned through the interpolation movement of the Z-axis and the Y-axis. The X-axis moving mechanism is a feeding mechanism, and the gear rough grinding is completed by the generating method; the A-axis rotating mechanism rotates clockwise and switches to the gear grinding head II, so that the grinding wheel axis of the gear grinding head II is parallel to the Y-axis, and the gear helix angle is deflected at the same time. The workpiece gear and the grinding wheel are aligned through the interpolation movement of the Z-axis and the Y-axis. The X-axis moving mechanism is a feeding mechanism, and the gear fine grinding is completed by the generating method; Step 3: Grinding the threaded part of the workpiece; If the workpiece thread length is short, the thread grinding head I can be used to complete the rough and fine grinding of the workpiece thread. The A-axis rotating mechanism rotates clockwise to switch to the thread grinding head I, so that the grinding wheel axis of the thread grinding head I is parallel to the Z axis, and the thread lead angle is deflected at the same time. The thread and the grinding wheel are aligned through the Z-axis and Y-axis interpolation movement. The X-axis moving mechanism is the feeding mechanism, and the thread rough and fine grinding is completed at one time using the generation method; If the workpiece thread length is long, thread grinding head I and thread grinding head II are used to complete the rough and fine grinding of the thread respectively. The A-axis rotating mechanism rotates clockwise and switches to thread grinding head I, so that the grinding wheel axis of thread grinding head I is parallel to the Z axis, and the thread lead angle is deflected at the same time. The thread and grinding wheel are aligned through the Z-axis and Y-axis interpolation motions. The X-axis moving mechanism is the feeding mechanism, and the generation method is used to complete the rough grinding of the thread. The A-axis rotating mechanism rotates clockwise and switches to thread grinding head II, so that the grinding wheel axis of thread grinding head II is parallel to the Z axis, and the thread lead angle is deflected at the same time. The thread and grinding wheel are aligned through the Z-axis and Y-axis interpolation motions. The X-axis moving mechanism is used as the feeding mechanism, and the generation method is used to complete the fine grinding of the thread.

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