CN101966611B - Tool holder mechanism of CNC gear shaping machine - Google Patents

Abstract

The invention relates to a cutter frame mechanism of a numerical control gear shaping machine, which mainly comprises a cutter shaft, a slide block, a cutter frame body and a motor, and is characterized in that: one end of the cutter shaft is connected with a hydraulic cylinder through a bearing, the other end of the cutter shaft is connected with a cutter connecting sleeve, a sliding block is sleeved outside the cutter shaft, a plug cap is connected below the hydraulic cylinder, a brake assembly is installed on the plug cap, the lower portion of the plug cap is connected with a cutter frame body and a torque motor base, a torque motor stator and a rotary table bearing are fixed on the torque motor base, a steel grid ruler and a middle sleeve are arranged on an inner ring of the rotary table bearing, a torque motor rotor and a fixed block are installed on the middle sleeve, a panel is arranged. The advantages are that: the problems that the cutter frame of the gear shaper has insufficient cutting force, the cutting length is limited, the rotation precision of the cutter shaft is low, the rotation speed of the cutter shaft is low and the like are solved, and the integral processing precision of the large-scale numerical control gear shaper is greatly improved.

Description

Tool holder mechanism of CNC gear shaping machine

technical field

The invention belongs to the technical field of gear processing, and in particular relates to a tool holder mechanism of a numerically controlled gear shaping machine.

Background technique

The tool rest of the gear shaping machine is fixed on the column of the CNC gear shaping machine. When slotting spur gears, the reciprocating motion of the tool shaft in the tool holder provides the cutting motion of gear shaping. During the cutting process, the tool shaft always rotates at a constant speed according to a certain law; when cutting helical gears, the tool shaft in the tool post The reciprocating motion provides the cutting motion of gear shaping, and the cutter shaft always accelerates and decelerates according to a certain rule 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, the tool holder mechanism of medium and small CNC gear shaping machines mainly includes cutter shaft, slider, fixed block, intermediate sleeve, tool holder body and worm gear transmission mechanism, etc. The driving mechanism of CNC gear shaping machine is variable frequency motor or spindle motor Drive the crank-slider mechanism or crank-rocker mechanism to move, and then the slider of the crank-slider mechanism moves up and down or the rocker of the crank-rocker mechanism swings to drive the knife shaft to move, so that the knife shaft moves up and down to form a cutting motion, and through the spring Realize dynamic balance and auxiliary cutter shaft return. On the large CNC gear shaping machine, the existing structure can no longer meet the cutting requirements, and the spring is not enough to provide enough force to make the cutter shaft return to its original position. The rotary motion of the cutter shaft is realized by the worm-worm gear mechanism driven by the servo motor, but the positioning accuracy of the worm-worm gear mechanism has an upper limit, and cannot provide fast enough rotation speed and response speed. Therefore, there is an urgent need for a tool holder mechanism that can meet the requirements of large and precise gear cutting.

Contents of the invention

In order to solve the technical problems in the known technology, the present invention provides a CNC gear shaper tool post mechanism which is driven by a servo hydraulic cylinder to provide the reciprocating motion of the cutter shaft and driven by a torque motor to provide the rotary motion of the cutter shaft.

The purpose of the present invention is to solve the problem that the large CNC gear shaper cannot cut large and precise gears due to insufficient cutting force, limited cutting length, low rotation precision of the cutter shaft, slow rotation speed of the cutter shaft, etc., and provides a The CNC gear shaper tool holder mechanism is driven by a servo hydraulic cylinder to provide the reciprocating motion of the cutter shaft, and driven by a torque motor to provide the rotary motion of the cutter shaft.

The technical solution adopted by the present invention to solve the technical problems existing in the known technology is: CNC gear shaping machine tool holder mechanism, mainly including cutter shaft, slider, tool holder body and motor, characterized in that: one end of the cutter shaft passes through The bearing is connected with a hydraulic cylinder for driving it to do up and down reciprocating cutting motion, and the other end is connected with the cutter sleeve, and the cutter shaft is equipped with a slider outside. The sliding brake assembly, the motor is a torque motor, the lower part of the plug cover is connected to the tool holder body and the torque motor base, the torque motor stator and the turntable bearing are fixed on the torque motor base, and the inner ring of the turntable bearing is equipped with steel A 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 inlaid strip, and the hydraulic cylinder is provided with a magnetic scale.

The present invention can also adopt following technical scheme:

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

The piston connecting rod of the hydraulic cylinder is fixedly connected with the sliding part of the bearing.

The turntable bearing is a three-row cylindrical roller turntable bearing, which is used to ensure the rotation accuracy of the cutter shaft.

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 advantages and positive effects of the present invention are: because the present invention adopts the above-mentioned technical scheme, that is, the servo hydraulic cylinder is used to drive the reciprocating motion of the cutter shaft of the tool holder mechanism of the numerical control gear shaper machine; Three-row cylindrical roller turret bearings to ensure the rotary accuracy of the cutter shaft; the rotary motion of the cutter shaft is driven by the torque motor, and the axisymmetric double fixed block and double insert structure are used to transmit the rotary driving force while ensuring the symmetry of the rotary center of the torque motor; The fixed block is provided with inserts to fill the gap between the slider and the fixed block, thereby solving the problems of insufficient cutting force, limited cutting length, low rotation accuracy of the cutter shaft, and slow rotation speed of the cutter shaft. The overall machining accuracy of the large CNC gear shaping machine is improved.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a cross-sectional view along line A-A of Fig. 1 .

In the figure: 1. Servo hydraulic cylinder; 2. Linear bearing; 3. Piston connecting rod; 4. Two-way thrust ball bearing; 5. Brake block; 6. Electromagnet; 7. Plug cover; 8. Cutter shaft; 9. Slider; 10. Fixed block; 11. Intermediate sleeve; 12. Built-in torque motor rotor; 13. Built-in torque motor stator; 14. Trunnion; 15. Torque motor base; 16. Cylindrical roller turntable bearing; 17 1. The upper sleeve of the knife shaft; 18. The body of the knife holder; 19. The lower sleeve of the knife shaft; 20. The sleeve of the knife; 21. The inlay; 22. The magnetic scale;

Detailed ways

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

Please refer to Figure 1 and Figure 2, the CNC gear shaper tool post mechanism mainly includes a cutter shaft 8, a slider 9, a tool post body 18 and a torque motor. One end of the cutter shaft 8 is connected with a servo hydraulic cylinder 1 for driving it to perform up-and-down reciprocating cutting motion through a linear bearing 2, and the other end is connected with a cutter sleeve 20, and the outside of the cutter shaft is equipped with a slider, and the cutter sleeve 20 and the slider Block 9 reciprocates with the cutter shaft. The piston connecting rod 3 of the hydraulic cylinder is fixedly connected with the sliding part of the linear bearing 2, the servo hydraulic cylinder 1 drives the piston connecting rod 3, and the piston connecting rod 3 pushes and pulls the knife shaft 8 through the two-way thrust ball bearing 4 to reciprocate, and passes the knife The shaft upper sleeve 17 and the cutter shaft lower sleeve 19 provide positioning support. 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 7 is connected below the hydraulic cylinder, and a brake assembly for preventing the cutter shaft from sliding is installed on the plug cover 7 . The brake assembly is composed of two electromagnets 6 installed on the plug cover and a brake block 5 connected to the inner side of the electromagnets. A tool holder body 18 and a torque motor base 15 are connected to the lower part of the plug cover, on which a built-in torque motor stator 13 and three rows of cylindrical roller turntable bearings 16 are fixed, and the three rows of cylindrical roller turntable Bearing 16 is used for guaranteeing the rotary precision of cutter shaft. An intermediate sleeve 11 is installed on the inner ring of the cylindrical roller turret bearing. The intermediate sleeve is equipped with a built-in torque motor rotor 12 and two fixed blocks 10. Each fixed block is provided with an inlay 21. The inlaid bars 21 are mainly Used to fill the gap between the slider and the fixed block. A magnetic scale 22 is provided on the hydraulic cylinder, and a steel scale 23 is installed on the inner ring of the turntable bearing. Through the magnetic scale 22 and the steel scale 23, the position signals of the vertical movement and rotary motion of the cutter shaft are fed back to the numerical control system to complete Full closed loop control.

The tool rest mechanism is supported and installed on the column of the CNC gear shaping machine through two left and right trunnions 14 fixed to the tool rest body.

When starting to move, the two electromagnets 6 drive the brake block 5 to move the brake block to the outermost position, leaving the space for the reciprocating movement of the cutter shaft. The servo hydraulic cylinder 1 provides the reciprocating motion of the cutter shaft with any regularity. The servo hydraulic cylinder 1 drives the piston connecting rod 3. The piston connecting rod 3 pushes and pulls the cutter shaft 8 through the two-way thrust ball bearing 4 for reciprocating motion. The slider 9 and the cutter sleeve 20 reciprocates with the cutter shaft 8, and is given positioning support by the upper sleeve 17 of the cutter shaft and the lower sleeve 19 of the cutter shaft, and moves on the fixed guide rod of the linear bearing 2 to limit the piston rotation of the servo hydraulic cylinder 1. During the movement, the inner ring of the three-row cylindrical roller turret bearing 16, the middle sleeve 11, the built-in torque motor rotor 12, the two fixed blocks 10 and the two inserts 21 rotate at the same time, and drive the cutter shaft 8 and the slider 9. The knife socket 20 makes a rotary motion. Through the reciprocating motion of the cutter shaft 8 and the rotary motion applied by the torque motor, the cutter shaft can perform helical motion to cut cylindrical gears with any helix angle. When stopping, the cutter shaft 8, the slider 9, and the cutter sleeve 20 stop at the uppermost position. At this time, the two electromagnets 6 drive the brake block 5, so that the brake block 5 moves to the direction of the cutter shaft and blocks the cutter shaft. Flange to prevent the free slide of the cutter shaft due to oil leakage of the hydraulic cylinder when the hydraulic cylinder stops running.

Claims (5)

1. A CNC gear shaper tool holder mechanism, mainly comprising a cutter shaft, a slide block, a tool holder body and a motor, characterized in that: 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 to the knife socket, and the knife shaft is equipped with a slider outside. A plug cover is connected under the hydraulic cylinder, and a brake assembly for preventing the knife shaft from sliding is installed on the plug cover. The motor is a torque motor. The lower part of the plug cover is connected with the tool holder body and the torque motor base, the torque motor stator and the turntable bearing are fixed on the torque motor base, the steel scale and the middle sleeve are installed on the inner ring of the turntable bearing, and the torque motor is installed on the middle sleeve The rotor and the fixed block are provided with inlaid strips, and the hydraulic cylinder is provided with a magnetic scale. 2. The CNC gear shaping machine tool holder mechanism according to claim 1, characterized in that: the brake assembly is composed of two electromagnets installed on the plug cover and brake blocks connected to the inside of the electromagnets . 3. The tool post mechanism of a CNC gear shaping machine according to claim 1, characterized in that: the piston connecting rod of the hydraulic cylinder is fixedly connected with the sliding part of the bearing. 4. The tool post mechanism of the CNC gear shaping machine according to claim 1, characterized in that: the turntable bearing is a three-row cylindrical roller turntable bearing, which is used to ensure the rotation accuracy of the tool shaft. 5. The tool post mechanism of a CNC gear shaping machine according to claim 1, wherein 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.

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