CN201871818U - Large hydraulic main-driving cutting total closed-loop numerical control gear shaper - Google Patents

Abstract

The utility model relates to a large hydraulic main-driving cutting total closed-loop numerical control gear shaper, which comprises a swiveling table, a lathe assembly, a middle lathe assembly, a stand column, a cutter back-off mechanism, a cutter rest mechanism, a numerical control system, a hydraulic system, a lubrication system and a cooling chip-removal system, wherein two sides of the swiveling table are respectively provided with a servomotor; the servomotors are connected with a worm gear and worm kinematic pair by a coupler to form the double driving mechanisms of the swiveling table; the cutter shaft of the cutter rest mechanism is driven by a hydraulic cylinder to carry out reciprocating motion; the motor bases of the cutter rest mechanism are provided with the servomotors; and the cutter back-off mechanism is provided with a camshaft of double conjugating cams for connecting and driving servomotors. The gear shaper has the advantages that the gear shaper is driven by the servo hydraulic cylinder to provide the reciprocating motion of the cutter shaft, the rotary motion of the cutter shaft is provided by a torque motor, the cutter back-off mechanism is driven by the servomotors, and the machining requirement on the large precision gear can be satisfied. The swiveling table has the advantages of large load bearing, high operation stability, high machining precision and strong machining flexibility and adaptability; and the machining range and the stroke length are enlarged, and the cutting force is improved.

Description

Large-scale hydraulic main drive cutting full-closed-loop CNC gear shaping machine

technical field

The utility model relates to the technical field of a numerical control gear shaping machine, in particular to a large-scale hydraulic main drive cutting full-closed-loop numerical control gear shaping machine.

Background technique

Large-scale gears are key components of large-scale wind power generation, large-scale forging equipment, large-scale metallurgical equipment, and large-scale ship transmissions. Large-scale CNC gear shaping machines are their indispensable working machines. At present, my country's large-scale precision multi-axis CNC gear shaping machines are still blank.

CNC gear shaping machines generally have control axes such as the rotary motion of the rotary table, the reciprocating main drive of the cutter shaft, the rotary motion of the cutter shaft, the radial feed motion, the tool letting motion and the oblique tool letting movement. At present, the driving method of the rotary table of large-scale CNC gear shaper is mainly servo motor, and most of them are driven by a single servo motor and a single worm gear pair. However, this transmission method causes a relatively large transmission gap in the transmission process of the worm gear pair. In order to achieve the purpose of eliminating the transmission backlash, the currently used anti-backlash method is that a single servo motor drives a worm gear pair or a gear pair, and at the same time drives another anti-backlash worm gear pair or a gear pair through a gear pair. The two worms or gears are installed together on the same Two worm gears or a gear mesh on the main shaft. The spindle structure of the above two methods is complicated, and it is difficult to process and debug. In the prior art, the drive mode of the rotary table of the gear shaping machine is mainly a servo motor, and its transmission mode includes a worm gear pair transmission and a gear pair transmission. Practice has proved that the worm gear transmission can provide high transmission accuracy and high transmission stability, but affected by various uncertain factors such as machining, assembly and debugging, the worm gear transmission process of the rotary table is inevitable. The transmission clearance, in turn affects the transmission accuracy. The worktable base of most rotary tables supports the rotary spindle by static pressure support, YRT three-row cylindrical roller bearing support or ordinary friction support with special materials as contact materials; although the static pressure support has good support rigidity, However, under the action of eccentric load force, especially the impact force of eccentric load, the end runout accuracy of the table is poor; the positioning accuracy of YRT three-row cylindrical roller bearing is constant, but the running accuracy of large YRT three-row cylindrical roller bearing is not ideal at present. There are also risks in coping with heavy-load impacts, which may even affect the life of the bearings; the ordinary friction support method with special materials as contact materials has great limitations in terms of running accuracy and transmission stability, and it has great limitations in offsetting heavy-load impacts. Under the action, the accuracy of all aspects is even more seriously challenged. Therefore, it is imminent to develop a utility model for a large-scale precision numerical control rotary table that can cope with the offset heavy-duty impact force.

The tool post of the gear shaping machine is fixed on the column of the CNC gear shaping machine. When cutting spur gears, the reciprocating motion of the tool shaft in the tool post provides the cutting motion of the gear shaping. During the cutting process, the tool shaft always follows a certain law. Rotate at a constant speed; when slotting helical gears, the reciprocating motion of the tool shaft in the tool holder provides the cutting motion for gear shaping, and the tool shaft always accelerates and decelerates according to a certain law during the cutting process. The stroke length and straightness of the reciprocating motion of the cutter shaft, the cutting force, the response speed of the rotary motion and the positioning accuracy are all prerequisites for ensuring the overall machining accuracy of the CNC gear shaping machine. At present, in small and medium-sized CNC gear shaping machines, the gear shaping and retracting movements of the tool post are driven by a three-phase asynchronous motor, that is, a three-phase asynchronous motor passes through a multi-stage mechanical transmission mechanism located inside the machine column To drive the tool holder, therefore, the gear shaping movement of the tool holder and the movement of the knife have the same motion cycle. The above-mentioned multi-stage mechanical transmission mechanism is linked to control the gear-shaping movement and the knife-releasing movement of the knife holder. The structure of the mechanism is very complicated and takes up a lot of space, and it is inconvenient to disassemble and maintain. In addition, the above-mentioned multi-stage mechanical transmission mechanism generally relies on the meshing of the fan teeth and the rack fixed on the tool holder to drive the tool holder to perform gear insertion. This structure not only has a short service life, but also is affected by the power of the three-phase asynchronous motor and the mechanical transmission mechanism Due to the influence of factors such as transmission torque, it cannot be applied to large CNC gear shaping machines for cutting large gears. In addition, the movement of the knife is generally realized through the linkage between the mechanical structure and the reciprocating movement of the knife shaft. This linkage method can ensure that the position of the knife is accurate. However, the working method is single, and the cylindrical gear can only be processed step by step, and it does not have sufficient flexibility and adaptability in the processing of non-straight cylindrical gears and other occasions.

The radial feed movement is mostly the movement of the worktable on the bed, but as the size of the workpiece increases, it becomes unrealistic to move the worktable, the movement is difficult, and there is a vulgar crawling phenomenon; although the motion control axis is mostly a servo motor Control, but generally semi-closed-loop control, the machining accuracy is not ideal. Therefore, it is imminent to develop a gear shaping machine for processing large precision gears that can meet market demand.

Contents of the invention

The utility model provides a large-scale hydraulic main drive cutting full-closed-loop numerical control gear shaping machine for solving the technical problems existing in the known technology.

The purpose of this utility model is to solve the problems of small processing range, low load bearing capacity of the rotary table, poor running stability of the rotary table, short stroke length, small cutting force, low processing precision, poor processing flexibility and adaptability existing in the current numerical control gear shaping machine. To solve the comprehensive problem, provide a large-scale hydraulic main drive cutting full-closed-loop CNC plug-in that is driven by a servo hydraulic cylinder to provide the reciprocating motion of the cutter shaft, driven by a torque motor to provide the rotary motion of the cutter shaft, and driven by a servo motor to allow the tool to be moved. gear machine.

The technical scheme that the utility model takes for solving the technical problem existing in the known technology is:

Large-scale hydraulic main drive cutting fully closed-loop CNC gear shaping machine, including: rotary table, bed assembly, middle bed assembly, column, tool letting mechanism and tool holder mechanism, numerical control system, hydraulic system, lubrication system and cooling row The chip system, the rotary table and the bed assembly are docked front and rear, the middle bed assembly is connected with a column, and a tool letting mechanism is installed on the column, and the tool rest mechanism is installed on the column through a trunnion, and passes through the knife The frame body is connected with the tool letting mechanism, and the feature is that: both sides of the rotary table are equipped with servo motors, and the servo motors are connected to the worm gear and worm motion pair through a coupling to form a double drive mechanism of the rotary table. There are multiple static pressure support pads on the outer circumference of the base; one end of the knife shaft of the tool rest mechanism is connected to a hydraulic cylinder for driving its up and down reciprocating cutting movement, and the hydraulic cylinder is provided with a magnetic scale. The motor base is equipped with a servo motor for realizing the rotary motion of the knife shaft; the cam shaft of the knife letting mechanism is connected with a driving servo motor through a reducer, and the cam shaft is equipped with conjugated double cams; the bed assembly and The middle bed assembly is connected by a roller linear guide rail-slider, and a high-precision steel scale for full closed-loop control is provided between the middle bed assembly and the bed assembly. The hydraulic cylinder is equipped with Fully closed-loop controlled magnetic scale.

The utility model can also adopt the following technical solutions:

12 static pressure support pads are installed in an array on the outer circumference of the base of the workbench. A groove is formed in the center of the static pressure support pads. There is a gap between the static pressure support pads and the lower end surface of the workbench spindle. The workbench spindle There are three rows of cylindrical roller turret bearings installed between the table base and the inner ring of the cylindrical roller turret bearings. A steel scale is installed.

The specific structure of the tool rest mechanism is as follows: one end of the cutter shaft is connected with a hydraulic cylinder for driving it to do up and down reciprocating cutting motion through a bearing, the other end is connected with a knife adapter sleeve, and the outside of the cutter shaft is fitted with a slide block. A plug cover is connected, and a brake assembly for preventing the knife shaft from sliding is installed on the plug cover. The lower part of the plug cover is connected with the tool rest body and the torque motor base, and the torque motor stator and the turntable are fixed on the torque motor base. Bearings, the inner ring of the turntable bearing is equipped with a steel scale and an intermediate sleeve, the intermediate sleeve is equipped with a torque motor rotor and a fixed block, the fixed block is provided with an inlay, and the hydraulic cylinder is provided with a magnetic scale.

The brake assembly is composed of two electromagnets installed on the plug cover and brake blocks connected with the inside of the electromagnets.

The cutter shaft is in contact with the lower sleeve of the cutter shaft, and the slider is in contact with the upper sleeve of the cutter shaft.

The specific structure of the knife letting mechanism is: including a servo motor, a reducer, a camshaft, a shift fork, an eccentric shaft, a knife letting rod and a tool rest body, the output shaft of the servo motor is connected with the input shaft of the reducer, and the The output shaft of the reducer is connected with one end of the camshaft, and the camshaft and the eccentric shaft are installed on the column of the CNC gear shaping machine through a flange sleeve and a bearing; the camshaft is provided with a conjugate double cam, and the There are two rollers on the shift fork, the conjugated double cam on the camshaft is connected with the two rollers on the shift fork, the shift fork is connected to the bushing, the bushing is fitted with the eccentric shaft, and the bushing Install the spline sleeve, the spline sleeve and the eccentric shaft are connected by splines, the eccentric shaft is provided with an eccentric portion, and one end of the knife puller is fitted on the eccentric portion of the eccentric shaft through the installation sleeve, so that the other end of the knife puller One end is hingedly connected with the tool rest body through a hinge shaft.

The shift fork of the knife letting mechanism is a Y-shaped structure, and rollers are respectively installed on two branches at the upper end of the Y-shaped structure. The lower part of the Y-shaped structure is a jacket with a fastening hole, and a keyway is processed in the jacket.

The advantages and positive effects of the utility model are: because the utility model adopts the above-mentioned technical scheme, that is, the rotary table adopts a double drive mechanism, which can not only drive together but also realize the purpose of eliminating backlash in the worm gear pair transmission; the rotary table adopts three rows The combined support of cylindrical rollers and static pressure can improve the bearing capacity, stability and rotation accuracy. The tool post mechanism adopts the servo hydraulic cylinder to provide the reciprocating motion of the tool shaft, and uses the torque motor to realize the rotary motion of the tool shaft, which can increase the cutting force of the gear shaping machine, increase the stroke length, improve the response speed of the tool shaft rotation, and then realize the electronic spiral guide rail function . The knife letting mechanism uses the servo motor to drive the conjugate double cam to generate the knife letting movement, which greatly improves the accuracy and adaptability of the knife letting mechanism. The middle bed moves on the bed to realize radial feed, and a steel scale is installed between the middle bed and the bed to improve the radial feed accuracy. The rotary motion of the worktable spindle of the rotary table, the radial feed motion between the bed assembly and the middle bed assembly, the up and down reciprocating motion of the cutter shaft, the rotary motion of the cutter shaft, and the rotary motion of the knife cam are all fully closed-loop controlled . Through the improvement of the above structure, this gear shaping machine can not only expand the processing range, stroke length and cutting force, greatly improve the processing accuracy of the machine tool, and has strong processing flexibility and adaptability, but also can meet the processing of large precision gears.

Description of drawings

Fig. 1 is the overall structural representation of the utility model;

Fig. 2 is the A-A sectional view of the rotary table of the present utility model;

Fig. 3 is the B-B sectional view of the rotary table of the present utility model;

Fig. 4 is a top view of the bed structure of the present utility model;

Fig. 5 is a top view of the middle bed structure of the utility model;

Fig. 6 is a longitudinal sectional view of the tool rest mechanism of the present utility model;

Fig. 7 is a C-C sectional view of Fig. 6;

Fig. 8 is a three-dimensional structure diagram of the knife letting mechanism of the present utility model;

Figure 9 is a cross-sectional view of Figure 8 .

In the picture:

100. Rotary table;

101. Workbench spindle; 102. Seal ring; 103. Static pressure support pad; 103a. Groove; 104. Three-row cylindrical roller turntable bearing; 105. Workbench base; 106. Drive worm gear; 107. Main drive servo motor ; 108, main drive reducer; 109, reducer adjustment washer; 110, main drive coupling; 111, main drive worm support frame; 112, main drive worm; 113, main drive needle bearing; 114, main drive bearing Support sleeve; 115, main drive thrust bearing; 116, driven servo motor; 117, driven reducer; 118, driven reducer adjustment washer; 119, driven coupling; 120, driven worm; 121, driven Moving worm support frame; 122, driven bearing support sleeve; 123, driven needle roller bearing; 124, driven thrust bearing; 125, steel scale;

200. Bed assembly;

201, bed; 202, roller linear guide; 203, steel scale; 204, screw nut; 205, screw; 206, coupling; 207, reducer; 208, servo motor;

300. Middle bed assembly;

301, middle bed; 302: servo motor; 303: reducer; 304: coupling; 305: lead screw; 306: lead screw nut seat;

400, column;

500. Knife letting mechanism;

501, servo motor; 502, reducer; 503, camshaft; 503a, conjugate double cam; 504, shift fork; 504a, roller; 504b, jacket; 504c, fastening hole; 505, eccentric shaft; 505a, Eccentric part; 506, let the knife pull rod; 507, installation sleeve; 508, coupling; 509, the first flange sleeve; 510, bearing; 511, stuffy cover; The second flange sleeve; 515, the third flange sleeve; 516, the reducer bracket; 517, the shaft sleeve; 518, the needle bearing.

600. Knife holder mechanism;

601. Servo hydraulic cylinder; 602: Linear bearing; 603: Piston connecting rod; 604: Two-way thrust ball bearing; 605: Brake block; 606: Electromagnet; 607: Plug cover; 608: Cutter shaft; 609: Slider; 610: fixed block; 611: intermediate sleeve; 612: built-in torque motor rotor; 613: built-in torque motor stator; 614: trunnion; 615: torque motor base; 616: three-row cylindrical roller turntable bearing; 617: 618: knife holder body; 619: lower sleeve of knife shaft; 620: knife socket; 621: inlay; 622: grating ruler; 623: magnetic grating ruler.

Detailed ways

In order to further understand the utility model content, characteristics and effects of the present utility model, the following examples are given hereby, and detailed descriptions are as follows in conjunction with the accompanying drawings:

Please refer to Figure 1, Figure 4 and Figure 5, the large-scale hydraulic main drive cutting full-closed-loop CNC gear shaper, including: rotary table 100, bed assembly 200, middle bed assembly 300, column 400, tool letting mechanism 500 , tool holder mechanism 600, numerical control system, hydraulic system, lubrication system and cooling chip removal system, and the numerical control system, hydraulic system, lubrication system and cooling chip removal system are not shown in the figure. The rotary table and the bed assembly are docked front and rear, the servo motor 208 of the radial feed mechanism is connected to the reducer 207, the output shaft of the reducer is connected to the coupling 206, the other end of the coupling is connected to the lead screw 205, and the lead screw The bearing is installed on the bed 201 , and the lead screw nut 204 of the lead screw is installed on the middle bed 301 . The bed 201 and the middle bed 3-1 are connected by the roller linear guide 202-slider. The length of the roller linear guide and the lead screw determines the processing range, and the length can be defined according to the application requirements. A high-precision steel scale 203 for full-closed-loop control is provided between the bed assembly and the middle bed assembly. The upper end of the middle bed assembly 300 is connected with the column 400 through bolts. The middle bed assembly 300 includes the middle bed 301, the servo motor 302 is connected to the reducer 303, the output shaft of the reducer is connected to the coupling 304, the other end of the coupling is connected to the lead screw 305, and the lead screw is installed on the middle bed through bearings , the lead screw nut 306 of the lead screw is installed on the column 400 . A knife letting mechanism 500 is installed on the column, and the tool holder mechanism 600 is installed on the column through a trunnion 614 , and is connected with the knife letting mechanism through a tool holder body 618 .

During work, the output shaft of the servo motor 208 drives the gears inside the reducer 207 to rotate, and at the same time the output shaft of the reducer rotates, and the lead screw 205 rotates at the same time, and drives the lead screw nut 204 on the lead screw to move, so that the middle bed assembly 300 moves on the roller linear guide 202. At the same time, the contacts of the middle bed 301 move on the steel scale 203 to complete the full closed-loop control of the radial feed.

When the gear shaping machine needs to adjust the oblique tool allowance, loosen the bolts between the middle bed 301 and the column 400, the output shaft of the servo motor 302 drives the gears inside the reducer 303 to rotate, and at the same time the output shaft of the reducer 303 rotates , the lead screw 305 rotates at the same time, driving the lead screw nut 306 on the lead screw to move, and then driving the column 400 to move on the middle bed 301 . When the column 400 and the middle bed 301 reach the required relative displacement, the bolts between the middle bed 301 and the column 400 are tightened.

Please refer to FIG. 2 and FIG. 3 , the two sides of the rotary table 100 are respectively provided with servo motors, and the servo motors are connected to the worm gear pair through a coupling to form a double drive mechanism of the rotary table. The concrete structure of described rotary workbench: comprise workbench base 105 and workbench main shaft 101, be installed in the worm screw and worm gear in the two sides of workbench base and reducer and servo motor connected with worm in one side of workbench base. The outer ring of the YRT three-row cylindrical roller bearing 104 is installed on the workbench base, and the workbench main shaft is installed on the inner ring of the YRT three-row cylindrical roller bearing 104, and the workbench main shaft can rotate. The main drive servo motor 107 is connected with the main drive reducer 108, the output end of the main drive reducer is connected with the main drive coupling 110, the main drive reducer is connected with the workbench base through the reducer adjustment pad 109, the main drive coupling is connected with the The main drive worm 112 is connected. The main drive worm needle roller bearing 113, the main drive bearing support sleeve 114 and the main drive thrust bearing 115 are installed on the main drive worm support frame 111, the main drive worm support frame is fixed on the workbench base, the main drive worm 112 and the drive worm wheel 106 Form a worm gear pair. A steel scale 125 is installed on the inner ring of the three-row cylindrical roller turntable bearing 104 .

The driven worm 120 in the other side of the workbench base is connected with a driven speed reducer 117 and a driven servo motor 116 through a driven coupling 119, and the output end of the driven speed reducer is connected with the driven coupling 119, The driven reducer is connected with the workbench base 105 through the reducer adjustment pad 109, and the driven coupling is connected with the driven worm 120. The driven worm needle roller bearing 123, the driven bearing support sleeve 122 and the driven thrust bearing 124 are installed on the driven worm support frame 121, and the driven worm support frame is fixed on the workbench base. The driven worm and the driven worm wheel 118 form a worm gear pair to form a driven worm gear pair that provides a resistance moment for the workbench base. The driven servo motor rotates according to a certain rule, so that the driven worm gives a certain auxiliary driving torque or resistance torque to the driven worm gear, so that the auxiliary driving torque is provided when it needs to be driven together, and it is used to eliminate the transmission gap when it needs to be eliminated during normal operation. The gap between the main drive worm and the driving worm gear improves the rotary positioning accuracy of the main shaft of the table. In order to protect the YRT three-row cylindrical roller bearings 104 and to strengthen the stability of the main shaft of the workbench, a plurality of static pressure support pads 103 are installed in an array on the periphery of the base of the rotary table. There is a groove 103a filled with a constant flow of lubricating oil to support the lower end surface of the table main shaft 101 . There is a gap between the lower end surface of the main shaft of the workbench and the static pressure support pad. In order to prevent the lubricating oil from overflowing, a sealing ring 102 is also provided on the outer circumference of the base of the rotary table. When working, inject lubricating oil into the groove, even when the rotary table is subjected to heavy load and offset impact force, a constant gap will be formed between it and the lower end surface of the rotary table spindle to enhance the bearing capacity of the rotary table spindle, and The oil film is frictionless and does not excessively increase the rotational torque. The steel scale 125 feeds back the position signal to the numerical control system to complete the full-closed-loop rotation control of the rotary table.

When starting to move, the main drive servo motor 7 drives the gears inside the main drive reducer 8 to rotate, and simultaneously drives the main drive worm 12 to rotate, and the main drive worm 12 drives the active worm gear 6 to rotate. The driven servo motor 16 rotates synchronously with the main drive servo motor 7 and drives the gears inside the driven reducer 17 to rotate, and at the same time drives the driven worm 20 to rotate. Since the driven servo motor rotates according to a certain law, the driven worm gives the active force. A certain resistance of the worm gear 6, because the main driving torque is greater than the resistance torque, makes the driving worm gear 6 rotate in the set direction and speed, thereby eliminating the gap between the main driving worm and the worm gear, and improving the rotary positioning accuracy of the main shaft of the table.

Please refer to Fig. 6 and Fig. 7, the concrete structure of described knife rest mechanism 600 is: mainly comprise cutter shaft 608, slide block 609, knife rest body 618 and torque motor. One end of the cutter shaft 608 is connected with a servo hydraulic cylinder 601 for driving it to do up and down reciprocating cutting motion through a linear bearing 602, and the other end is connected with a cutter sleeve 620, and the outer sleeve of the cutter shaft is equipped with a slider 609. The slider 609 reciprocates with the cutter shaft. The piston connecting rod 603 of the hydraulic cylinder is fixedly connected with the sliding part of the linear bearing 602, the servo hydraulic cylinder 601 drives the piston connecting rod 603, and the piston connecting rod 603 pushes and pulls the knife shaft 608 through the bidirectional thrust ball bearing 604 for reciprocating motion, and passes the knife The shaft upper sleeve 617 and the cutter shaft lower sleeve 619 provide positioning support. The cutter shaft is in contact with the lower sleeve of the cutter shaft, and the slider is in contact with the upper sleeve of the cutter shaft. The piston connecting rod and the two-way thrust ball bearing inside can also play the role of adjusting the center of the hydraulic cylinder shaft and the cutter shaft in the linear direction while transmitting the cutting force. A plug cover 607 is connected below the hydraulic cylinder, and a brake assembly for preventing the cutter shaft from sliding is installed on the plug cover 607 . The braking assembly is composed of two electromagnets 606 installed on the plug cover and a braking block 605 connected to the inside of the electromagnets. A tool rest body 618 and a torque motor base 615 are connected to the lower part of the plug cover, and a built-in torque motor stator 613 and three rows of cylindrical roller turret bearings 616 are fixed on the torque motor pedestal, and the inner ring of the cylindrical roller turret bearing A middle sleeve 611 is installed on the middle sleeve. The built-in torque motor rotor 612 and two fixed blocks 610 are installed on the middle sleeve. Each fixed block is provided with an inlay 621, which is mainly used to fill the slider and the fixed block. gap between. The hydraulic cylinder is provided with a magnetic scale 622, and the inner ring of the turntable bearing is equipped with a steel scale 623. Through the magnetic scale 622 and the steel scale 623, the position signals of the vertical movement and rotary motion of the cutter shaft are fed back to the numerical control system, and the Full closed loop control. The tool rest mechanism is supported and installed on the column of the CNC gear shaping machine by two left and right trunnions 614 fixed to the tool rest body.

When starting to move, the two electromagnets 606 drive the brake block 605 to move the brake block to the outermost position, leaving space for the cutter shaft to reciprocate. The servo hydraulic cylinder 601 provides the reciprocating motion of the cutter shaft with any regular motion, the servo hydraulic cylinder 601 drives the piston connecting rod 603, and the piston connecting rod pushes and pulls the cutter shaft 608 through the bidirectional thrust ball bearing 604 for reciprocating motion, the slider 609 and the cutter sleeve 620 With the reciprocating movement of the cutter shaft and the positioning support given by the upper sleeve 617 and the lower sleeve 619 of the cutter shaft, the fixed guide rod of the linear bearing 602 moves to limit the rotation of the piston rod of the servo hydraulic cylinder 601 . During the movement, the inner ring of the three-row cylindrical roller turret bearing, the middle sleeve 611, the built-in torque motor rotor 612, the two fixed blocks 610 and the two inserts 621 rotate simultaneously, and drive the cutter shaft, the slider and the cutter The socket 620 performs a rotary motion. Through the reciprocating motion of the cutter shaft and the rotary motion exerted by the torque motor, the cutter shaft can perform helical motion to cut cylindrical gears with any helix angle. When the machine stops, the cutter shaft, the slide block, and the cutter sleeve stop at the uppermost position. At this time, two electromagnets drive the brake block, so that the brake block moves to the direction of the cutter shaft and blocks the flange of the cutter shaft to prevent hydraulic pressure. When the cylinder stops running, the free slide of the cutter shaft is caused by the oil leakage of the hydraulic cylinder.

Please refer to FIG. 8 and FIG. 9 , the tool letting mechanism 500 includes: a servo motor 501 , a reducer 502 , a camshaft 503 , a shift fork 504 , an eccentric shaft 505 , a knife letting lever 506 and a knife holder body 618 . The output shaft of the servo motor 501 is connected with the input shaft of the speed reducer 502 . The reducer 502 is a helical gear reducer, and the reducer 502 is fixed on the reducer bracket 516 by bolts, and the reducer bracket is installed on the column 400 . The output shaft of the reducer is connected to one end of the camshaft 503 through a coupling 508, and the other end of the camshaft is provided with a conjugated double cam 503a, and the two ends of the camshaft pass through the bearing 510 and the first flange sleeve 509 Installed on the column 400, one end of the camshaft is provided with a blind cover 511, so that the camshaft can rotate axially under the drive of the output shaft of the reducer.

The shift fork 504 is a Y-shaped structure, rollers 504a are installed on the two branches of the upper end of the shift fork, the conjugate double cam on the camshaft is located between the two rollers 504a, and the conjugate double cam The two cams are respectively connected to the two rollers on the shift fork, that is, the two cams of the conjugated double cam can press the two rollers on the shift fork separately and not at the same time, so that the designer needs to adjust the stroke of the knife according to the mechanism. It is required to design and calculate the relative position of the conjugated double cam and the two rollers on the shift fork and the shape curve of the conjugated double cam. The lower part of the Y-shaped shift fork is a jacket 504b processed with a fastening hole 504c, and a keyway is processed in the jacket. A shaft sleeve 517 is fitted on the eccentric shaft 505, a needle bearing 518 is arranged between the eccentric shaft and the shaft sleeve, and the eccentric shaft and the shaft sleeve can rotate relatively. One end of the shaft sleeve is installed with a splined sleeve 512 through a bolt, the splined sleeve is connected with the eccentric shaft through a spline, and the splined sleeve is axially fixed by a pressing nut 513 . The jacket 504b at the lower part of the shift fork is set on the shaft sleeve 518. After the jacket and the shaft sleeve are connected by a flat key, the shift fork 504 is locked on the shaft sleeve with bolts through the fastening hole 504c of the jacket. The second flange sleeve 514 is installed on the outer side of the shaft sleeve through the bearing 510, and the second flange sleeve is fixed to the column 400 by bolts, so as to realize the installation of one end of the eccentric shaft on the column, and the other end of the eccentric shaft with a needle roller bearing 518 and the third flange cover 515 are installed on the column. A mounting sleeve 507 is provided at one end of the knife pulling rod 516, and the mounting sleeve is fitted on the eccentric portion 505a of the eccentric shaft, and a needle bearing 518 is provided between the mounting sleeve and the eccentric portion. The other end of the knife rod is hinged to the knife rest body 618 through a hinge shaft, and a needle bearing 518 is arranged at the hinge. The tool holder body 618 is a connecting piece connected with the gear shaper tool holder. The eccentric shaft is driven by the shift fork to rotate reciprocatingly along the circumference, and the eccentric part 505a of the eccentric shaft drives the knife pulling rod, and the knife pulling rod pushes and pulls the knife holder body connected with the knife rest, so as to finally realize the knife letting action.

In the above structure, the bolts of the spline sleeve 512 and the shaft sleeve 517 are loosened, and then the spline sleeve and the eccentric shaft are rotated 180° and then locked. In this way, the tool holder starts to cut teeth, and the retracting direction of the tool holder is the same as the original direction. On the contrary, this method can be used to switch the function of CNC gear shaper cutting internal and external gears.

The utility model discloses a hydraulic main drive cutting full-closed-loop numerical control gear shaping machine, which can be controlled by six axes, and can be linked by five axes during the cutting work, so as to complete the cutting of various cylindrical gears.

Claims (7)

1. a large hydraulic master drives cutting full cut-off number of rings control gear shapping machine, comprise: rotary table, the lathe bed assembly, the medial bed assembly, column, relieving mechanism, cutter frame mechanism, digital control system, hydraulic system, lubricating system and cooling chip removal system, described rotary table and lathe bed assembly tandem docking, connect column on the medial bed assembly, relieving mechanism is installed on column, described cutter frame mechanism is installed on the column by gudgeon, and be connected with relieving mechanism by tool-post structure, it is characterized in that: described rotary table both sides are equipped with servomotor, servomotor connects the worm and gear kinematic pair to constitute the double driving mechanism of rotary table by shaft coupling, is provided with a plurality of static pressure supporting pads on rotary table base excircle; Cutter shaft one end of described cutter frame mechanism is connected with and is used to drive its hydraulic cylinder of cutting movement up and down reciprocatingly, and described hydraulic cylinder is provided with magnetic railings ruler, and the servomotor that is used to realize the cutter shaft gyration is housed on the motor base of cutter frame mechanism; The camshaft of described relieving mechanism is connected with the driving servomotor by reductor, and the conjugation double cam is housed on the described camshaft; Be connected by roller line slideway-slide block between described lathe bed assembly and the medial bed assembly, be provided with the high accuracy steel grid chi that is used for the control of full cut-off ring between medial bed assembly and lathe bed assembly, described hydraulic cylinder is provided with the magnetic railings ruler of full cut-off ring control.

2. large hydraulic master according to claim 1 drives cutting full cut-off number of rings control gear shapping machine, it is characterized in that: array is equipped with 12 static pressure supporting pads on the described table base excircle, the center of described static pressure supporting pad is shaped on groove, static pressure supporting pad and workbench main shaft lower surface are provided with the gap, three-row cylinder roller turntable bearing is installed between described workbench main shaft and the table base, steel grid chi is installed at cylindrical roller turntable bearing inner race.

3. large hydraulic master according to claim 1 drives cutting full cut-off number of rings control gear shapping machine, it is characterized in that: the concrete structure of described cutter frame mechanism is: described cutter shaft one end is connected with by bearing and is used to drive it and does the hydraulic cylinder of cutting movement up and down reciprocatingly, the other end connects cutter and connects cover, the outside suit slide block of cutter shaft, be connected with bayonet cap below the described hydraulic cylinder, the brake assembly that is used to prevent the cutter shaft downslide is installed on the described bayonet cap, the bayonet cap bottom connects tool-post structure and torque motor pedestal, be fixed with torque motor stator and turntable bearing on the described torque motor pedestal, steel grid chi and intermediate sleeve are housed on the turntable bearing inner race, torque motor rotor and fixed block are housed on the described intermediate sleeve, fixed block is provided with panel, and described hydraulic cylinder is provided with magnetic railings ruler.

4. large hydraulic master according to claim 3 drives cutting full cut-off number of rings control gear shapping machine, it is characterized in that: described brake assembly is to be made of with the brake block that is connected with the electromagnet inboard two blocks of electromagnet that are installed on the bayonet cap.

5. large hydraulic master according to claim 3 drives cutting full cut-off number of rings control gear shapping machine, and it is characterized in that: described cutter shaft is trapped to cooperate with cutter shaft and contacted, and described slide block contacts with cover cooperation on the cutter shaft.

6. large hydraulic master according to claim 1 drives cutting full cut-off number of rings control gear shapping machine, it is characterized in that: the concrete structure of described relieving mechanism is: comprise servomotor, decelerator, camshaft, shift fork, eccentric shaft, cutter relieving pull bar and tool-post structure, the output shaft of described servomotor connects with input shaft of speed reducer, the output shaft of described decelerator connects with an end of camshaft, and described camshaft and eccentric shaft are installed on the column of digital control gear shaper by flange cover and bearing; Described camshaft is provided with the conjugation double cam, described shift fork is provided with two rollers, conjugation double cam on the described camshaft is connected with two rollers on the shift fork, described shift fork connecting bushing, axle sleeve and eccentric shaft suit, and spline housing is installed on the axle sleeve, spline housing is connected by spline with eccentric shaft, described eccentric shaft is provided with eccentric part, and an end of described cutter relieving pull bar is assemblied in by installation sleeve on the eccentric part of eccentric shaft, and the other end and the tool-post structure of cutter relieving pull bar are articulated and connected by hinge.

7. large hydraulic master according to claim 6 drives cutting full cut-off number of rings control gear shapping machine, it is characterized in that: the shift fork of described relieving mechanism is a Y shape structure, in two branches of Y shape structure upper end, roller is installed respectively, the bottom of Y shape structure is the chuck that has fastener hole, is processed with keyway in the chuck.

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