JPS624409Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic eccentricity device for a chuck that can automatically adjust the eccentricity of a chuck that grips an eccentric workpiece in a lathe or the like. Conventionally, in order to machine eccentric workpieces, the chuck was moved in a direction perpendicular to the spindle, and the chuck was manually adjusted so that the chuck was eccentric by the required amount from the spindle, making the adjustment work easier. It takes time to make accurate adjustments even for workpieces of the same shape, and it is a troublesome work that requires skill and effort. Also, although an eccentric chuck as disclosed in Japanese Patent Application Laid-Open No. 51-43277 is known, the eccentric operation is performed on the headstock side, and it is not suitable for NC machine tools, but an automatic eccentric chuck that can fully utilize NC. There was no equipment.

Therefore, the present invention aims to provide a device that can automatically adjust the amount of eccentricity for the purpose of saving labor for the worker.The present invention aims to provide a device that can automatically adjust the amount of eccentricity in order to save labor for the worker. A spindle indexing means is provided so that the moving direction of the chuck corresponds to the cutting direction of the tool post, and a member that engages with the chuck is provided on the tool post to automatically adjust the eccentricity of the chuck by positioning the tool post using NC. It is characterized by this.

Embodiments of the present invention will be described below based on the drawings. For example, in an NC lathe, a face plate 3 is fastened to a front end shoot taper 2 of a hollow main spindle 1 rotatably supported on a headstock (not shown).
A guide plate 5 forming parallel guide grooves 4 symmetrical about the center is fastened to. A slider 6 is fitted into this guide groove so that it can slide without any gap in the direction perpendicular to the direction of movement. This slider 6 has two T
Shapes 7 and 8 are formed in parallel, and the T-shape 7 and
The outer sides 7a and 8a of 8 are in contact with the guide groove 4, respectively, and the inner sides 7b and 8b are engaged with tensioning pieces to be described later. A collector chuck 10 is also fixed to the front surface of the slider 6, and movement of the slider 6 allows the chuck to have the necessary eccentricity. The main body 11 of the collet chuck 10 is a cylinder, and a headed expansion rod 15 is attached to a rod 13 protruding forward of a fitted piston 12 to act on a collet 14. By pulling the collet bushing 16 in the axial direction, it is expanded and brought into close contact with the inner diameter of the workpiece W, thereby firmly holding the workpiece. A spring 17 is interposed between the rear chamber of the cylinder and the piston 12, and constantly biases the headed expansion rod 15 in the pushing direction to prevent the collet bush 16 from opening. A fluid pressure cylinder 18 is fixed to the rear end of the main shaft 1, a piston 19 is fitted therein, and a piston rod 20 is connected to a draw rod 21.
The tip of the draw rod 21 is T-shaped 7 and 8 of the slider 6.
A tensioning piece 22 inserted between the two is attached. Pressure air is supplied to the cylinder 18 through a flow path 23 in the front chamber and a flow path 24 in the rear chamber, which are connected to a pressure source and the atmosphere through a rotary joint 25, and when pressurized air is supplied to the front chamber, the tension piece 22 fixes the slider 6 to the face plate 3. On the other hand, the pressurized air for operating the collect chuck is passed from a flow path 26 leading to the front chamber of the cylinder of the chuck body 11 through a window in the center of the slider 6 to the tensioning piece 22,
It passes through holes in the draw rod 21, piston rod 20, and rotary joint 25, and communicates with a pressure source through a rotary joint 27 provided on the rear side of the rotary joint 25. Note that the flow path between the flow path 26 and the tensioning piece 22 and the piston rod 2 between the rotary joint 27 of the draw rod 21
The flow paths inside 0 are connected by flexible material.
Further, a main shaft indexing disk 28 is fixed to the rear end of the main shaft, and a notch 28a is cut therein to index the moving direction of the slider 6 to a position that matches the cutting direction of the tool rest. An indexing pin 30 that is moved forward and backward by a hydraulic cylinder 29 is fitted into the position. 31 is an index pin confirmation limit switch. on the other hand
The X-axis motor 32 rotates in response to a command from the NC device, and the turret tool post 34 is sent via the feed screw 33.
A moving block 37 is attached to the chuck, which has a pin 36 projecting in the direction of the main shafts and engaging with a locking hole 35 formed in the front surface of the chuck. This locking hole 3
5 may be perforated in the slider 6. 38 is a detector that detects the current position of the tool post. Further, an eccentricity measurement sensor 40 for measuring the amount of eccentricity of the chuck 10 is attached to the turret tool rest 39, which has the same cutting direction as the turret tool rest 34, and a necessary signal is emitted when the chuck comes into contact with the chuck body 11. and output to the NC device. 41 is a ring attached to the front surface of the face plate 3 to prevent the slider from popping out. 42 is a positioning ring for the workpiece.

In this device configured in this way, when an eccentric workpiece to be machined is determined from among those stored in the NC device, the spindle 1 starts indexing rotation by an eccentric adjustment command using the auxiliary function of the NC. The notch 28a of the indexing disk is roughly indexed by the rough indexing device, pressure fluid is sent to the cylinder 29 in response to the rough indexing completion signal, the indexing pin 30 is fitted into the notch 28a, and a completion signal is issued from the limit switch 31 confirming this fine indexing. Emitted.
The tool rest 34 is moved in the Z (main axis line) direction and the X (cut) direction, and the pin 36 of the moving block 37 engages with the hole 35 in the chuck. Here, if the current eccentricity of the chuck 10 is stored in the NC, measure the eccentricity based on that value, or if the current eccentricity of the chuck is unknown, move the tool post 39 in the X and Z directions to measure the eccentricity. Connect the feeler of the sensor 40 to the chuck body 11
The amount of eccentricity is calculated from the current value of the tool rest at the position where the contact signal is generated, and the tool correction of the tool rest 34 is performed. Next, pressure fluid is sent from the flow path 24 to the rear chamber of the cylinder 18, and the piston 19,
Move the draw rod 21 forward and loosen the tension piece 22. Then, the chuck 10 is moved by the tool post 34 via the pin 36 of the moving block 37 so as to correspond to the eccentricity of the eccentric workpiece. This amount of movement is confirmed by the eccentricity measuring sensor 40, and if there is a problem, the tool correction of the moving block is changed to correct the error. If the eccentricity adjustment amount is correct, cylinder 18
Pressurized air is sent to the front chamber of the rotary joint 25 and the flow path 23 to retract the piston 19 and the draw rod 21, and the tensioning piece 22 is pulled to fix the slider 6 and the chuck 10 to the face plate. When the fixation is completed, the tool rests 34 and 39 return to their standby positions, switch the pressure supply path to the index cylinder 29, move the index pin 30 backward, and release the fixation of the main shaft. In response to the release confirmation signal from the limit switch 31, the workpiece W is transferred to the collet of the chuck 10, and pressure fluid is sent from the rotary joint 27 and supplied from the channel 26 to the cylinder front chamber of the chuck body 11, and the piston 12 and the headed expansion rod 15 are moved. The pull collet bush 16 is expanded to grasp and fix the workpiece W. It goes without saying that the chuck is not limited to a collect chuck, but can also be used as a scroll chuck or the like.

As described in detail above, according to the present invention, the slider to which the chuck is attached is automatically tightened, and the moving direction of the chuck and the cutting direction of the tool rest are made to coincide with each other during eccentric adjustment, and the main shaft is indexed. The tool post is fixed and the engaging member provided on the tool post is engaged with the chuck, and the positioning of the tool post is controlled by NC to adjust the eccentricity, so all adjustment operations can be performed automatically by commands from the NC device. It has the characteristics of being able to reduce the burden on workers, improve work efficiency, and support full automation.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the main shaft and chuck portion of the present invention in cross section, and Fig. 2 shows the slider 6 shown in cross section in Fig. 1 at a position where it has been rotated 90 degrees around the main shaft line. It is a sectional view of a slider. 1... Main shaft, 3... Face plate, 4... Guide groove, 6...
...Slider, 10...Chuck, 18...Cylinder, 21...Draw rod, 22...Tightening piece, 2
8... Index disk, 30... Index pin, 37... Moving block, 34/39... Tool rest.

Claims (1)

[Scope of utility model registration request] In an NC machine tool, a guide groove is provided in the spindle face plate in a direction perpendicular to the center of the spindle, a slider is slidably fitted into the guide groove, and an automatic chuck with a built-in pawl opening/closing mechanism is installed in the slider. A tensioning drive means for operating a tensioning piece for tightening and loosening the slider is provided at the rear end of the main shaft, and the main shaft is mounted so that the guide groove of the main shaft face plate is in the cutting direction of the tool post. an engaging portion is provided on the chuck or slider, and an engaging member for engaging with the engaging portion of the chuck or slider is attached to the tool rest, so that the tool rest is engaged with the tool rest. An automatic chuck eccentricity device using an NC axis, characterized in that the necessary eccentricity of the chuck is set by engaging a member with an engaging part of a chuck or a slider and positioning the tool post using NC.