CN201009025Y - A fixture capable of automatically adjusting the plane of the EDM tool parallel to the surface of the workpiece - Google Patents

Abstract

The utility model discloses a fixture which can automatically adjust the plane of an electric spark tool parallel to the surface of a workpiece. The first gear is installed under the stepping motor, which meshes with the second gear which is vacantly sleeved on the central shaft. The first bearing is installed on the central shaft, and its inner ring and the central shaft are interference fit. The outer ring of the first bearing and the second The two gears are fixedly connected, the cross arm on the outer ring of the first bearing is connected to the linear motor, the lower end of the central shaft and the upper end of the cutter bar are a ball pair fit, the inner ring of the second bearing is an interference fit with the cutter bar, and the outer ring of the second bearing The telescopic arms arranged at 180° are inherent on both sides. Displacement sensors are installed at the ends of the two telescopic arms. The telescopic head of the linear motor is connected to the telescopic arm on one side. The processing signal controls the telescopic head of the linear motor to move up and down through D/A conversion. Using the detection of sensors and the control and feedback control of single-chip microcomputer programming, the whole process of automation from detection to parallel adjustment is realized, and the speed is fast and the precision is high.

Description

A fixture capable of automatically adjusting the plane of the EDM tool parallel to the surface of the workpiece

technical field

The utility model relates to an electric spark machine tool, in particular to a fixture which can monitor the plane of a workpiece and automatically adjust the plane of an electric spark tool parallel to the surface of the workpiece.

Background technique

A general vertical electric discharge machine tool includes a machine table, a moving column arranged on the machine table, and a spindle head seat arranged on the moving column and capable of lifting relative to the moving column along the Z direction. The spindle headstock has a spindle extending along the -Z direction.

In EDM machine tools, the surface of the tool needs to be parallel to the surface of the workpiece for precise machining. However, the current parallel adjustment between the tool surface and the workpiece surface is not automatically adjusted by the machine tool, but is adjusted by human visual inspection. Obviously, this is very imprecise, so the processed patterns often have defects.

Contents of the invention

In order to overcome the deficiency that the cutting tool plane and the workpiece plane cannot be accurately kept parallel on the existing EDM machine tool, the purpose of this utility model is to provide a fixture that can automatically adjust the EDM tool plane to be parallel to the workpiece surface.

The technical scheme adopted by the utility model to solve the technical problem is: the control box and the stepping motor are fixed on the machine tool, the first gear is installed under the stepping motor, and the first gear meshes with the second gear which is empty on the central shaft , the central shaft is equipped with the first bearing, the inner ring of the first bearing is an interference fit with the central shaft, the outer ring of the first bearing is fixedly connected with the second gear, and a cross arm is arranged on the circumference of the outer ring of the first bearing, and the cross arm The lower end is connected with the linear motor, the lower end of the central shaft is fitted with the upper end of the cutter bar equipped with a tool as a ball pair, the inner ring of the second bearing is an interference fit with the cutter bar, and both sides of the outer ring of the second bearing are fixedly connected with the two telescopic arm sleeves , the two telescopic arms are arranged at 180° on the outer ring of the second bearing, and the ends of the two telescopic arms are equipped with non-contact displacement sensors facing the workpiece. The telescopic head of the linear motor is connected with the telescopic arm on one side, non-contact The displacement sensor connects the detection signal to the single-chip microcomputer through A/D conversion, and the single-chip microcomputer controls the telescopic head of the linear motor to move up and down through D/A conversion through calculation.

The utility model has the beneficial effects that: due to the use of non-contact displacement sensor detection and single-chip programming control and feedback control, the whole process of automation from parallel detection to parallel adjustment can be realized, and the speed is high and the precision is high.

Description of drawings

Fig. 1 is the structural principle schematic diagram of the utility model.

Figure 2 is a diagram of the locking state after the adjustment of the ball pair is completed.

Fig. 3 is a diagram of the loosening state when the A-direction ball pair in Fig. 2 is not adjusted.

In the figure: 1. Indicator light, 2. Control box, 3. Stepping motor, 4. First gear, 5. First bearing, 6. Ball pair, 7. Second bearing, 8. Telescopic arm, 9. Tool , 10. Workpiece, 11. Central axis, 12. Second gear, 13. Cross arm, 14. Linear motor, 15. Non-contact displacement sensor, 16. Locking screw, 17. Arbor.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described

As shown in Fig. 1, Fig. 2, Fig. 3, control box 2 of the present utility model and stepper motor 3 are fixed on the lathe, control box is provided with indicator light 1, first gear 4 is housed under stepper motor 3, The first gear 4 meshes with the second gear that is vacantly sleeved on the central shaft 11. The central shaft 11 is equipped with a first bearing 5. The inner ring of the first bearing 5 is an interference fit with the central shaft 11. The outer ring of the first bearing 5 is in contact with the central shaft 11. The second gear 12 is fixedly connected together, and the first bearing 5 is provided with a cross arm 13 on the circumference of the outer ring. Cooperate, there are two locking screws 16 on the ball pair 6, and the two locking screws 16 are distributed at 90° in the XY plane, and the two sides of the tool bar 17 equipped with the cutter 9 are respectively equipped with telescopic arms 8, and the functions of the telescopic arms 8 Mainly, the distance between the two displacement sensors can be adjusted according to the size of the workpiece. The ends of the two telescopic arms 8 are equipped with non-contact displacement sensors 15 facing the workpiece 10. The telescopic head of the linear motor 14 is connected to the telescopic arm 8 on one side. The inner ring of the second bearing 7 is an interference fit with the cutter bar 17, and the outer ring of the second bearing 7 is fixedly connected with the outer ring of the two telescopic arms 8, and the two telescopic arms are connected at 180° on the outer ring of the second bearing. The contact displacement sensor 15 connects the detection signal to the single-chip microcomputer through A/D conversion, and the single-chip microcomputer controls the telescopic head of the linear motor 14 to move up and down through D/A conversion through calculation.

The adjustment process of the present utility model is as follows:

The utility model adopts an independent power supply for power supply. When in use, it is installed on the top of the spindle of the EDM machine tool, the tool 9 is clamped, the workpiece 10 is placed under the tool 9, and the switch is pressed to start automatic correction. The two non-contact displacement sensors 13 collect distance data in the X direction, and the two distance analog signals are converted into digital signals by the 8096A/D conversion chip and transmitted to the single chip microcomputer for processing. If the two distances are not equal, the distance that the linear motor 14 should be extended or shortened is calculated according to the pre-set gap-adjustment model, and the result is transmitted to the adjustment mechanism through the D/A conversion chip to accurately adjust the specified distance. Adjustment, after the adjustment is completed, the two sensors detect again, if the distance is not equal, repeat the above adjustment; if the distance is equal, the single chip microcomputer stops operating. After the operator tightens the screw in the X direction of the ball pair, press the switch, the single chip microcomputer continues to work, the stepper motor drives the two sensors to rotate 90°, and performs the same sampling and adjustment in the Y direction, so that the reference planes perpendicular to each other Two straight lines (X-axis, Y-axis) are parallel to the surface of the workpiece, so that the machining plane of the tool is parallel to the surface of the workpiece. After the correction in the X direction is completed, tighten the locking screw 16 of the ball pair 6 so that the ball pair 6 can only rotate around the X axis; when the Y direction is also corrected, tighten the other locking screw 16 of the ball pair 6 , so that the ball pair 6 is fully locked, the indicator light is on, and the tool 9 can be processed.

The above-mentioned specific embodiments are used to explain the utility model, rather than to limit the utility model. Within the spirit of the utility model and the scope of protection of the claims, any modifications and changes made to the utility model fall into the scope of the utility model. scope of protection.

Claims (1)

1. A clamp that can automatically adjust the plane of the electric spark tool to be parallel to the surface of the workpiece is characterized in that: the control box (2) and the stepping motor (3) are fixed on the machine tool, and the stepping motor (3) is equipped with a first Gear (4), the first gear (4) meshes with the second gear on the central shaft (11), the first bearing (5) is housed on the central shaft (11), and the inner ring of the first bearing (5) and The central shaft (11) is an interference fit, the outer ring of the first bearing (5) is fixedly connected with the second gear (12), and a cross arm (13) is arranged on the outer ring circumference of the first bearing (5). (13) is connected with the linear motor (14), the lower end of the central shaft (11) is matched with the upper end of the cutter bar (17) equipped with the cutter (9) as a ball pair (6), and the inner ring of the second bearing (7) and the cutter The rod (17) is an interference fit. Both sides of the outer ring of the second bearing (7) are fixedly connected to the outer casings of the two telescopic arms (8). The two telescopic arms are arranged at 180° on the outer ring of the second bearing. The two telescopic arms (8) The non-contact displacement sensor (15) facing the workpiece (10) is installed at the end, the telescopic head of the linear motor (14) is connected with the telescopic arm (8) on one side, and the non-contact displacement sensor (1 5 ) the detection signal is connected to the single-chip microcomputer through A/D conversion, and the single-chip microcomputer processes the signal through D/A conversion to control the telescopic head of the linear motor (14) to move up and down.

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