JPS6263021A - Initial hole driller - Google Patents

Abstract

PURPOSE:To prevent moisture from penetrating into a box body as well as to keep off the occurrence of rusting in constituent parts and an electric leakage, by installing an air suction device and an air exhaust device both in the driller box body. CONSTITUTION:A suction hose 16 and an exhaust hose 17 both are installed on top of an initial hole driller 1a, and the outside air is inhaled or exhausted in or from a box body 1a. With this constitution, fresh air is always led into the box body so that if water of a machining fluid penetrates into the box body, this moisture is exhausted by the air inhaled or exhausted, and if the driller is cooled by the water of the machining fluid, dew drops are by no means produced in the box body, therefore rusting in each constituent element of the driller is prevented from occurring and, what is more, no electric leakage happens there.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an initial hole machining device for machining an initial hole in a wire-cut electric discharge machine to pass a wire electrode through a workpiece before machining is started.

Conventional technology wire cut tJ! In electrical machining, it is necessary to drill a hole for the wire electrode insertion at a predetermined position on the workpiece, and such a hole for the wire electrode insertion, that is, the initial hole, is connected to the operating mechanism of the wire-cut electric discharge machine. An initial hole processing device that uses the method to easily drill holes has already been developed.

This initial hole processing device forms an initial hole in a workpiece by rotating and lowering a vibrating electrode while spraying water as a processing fluid onto a processing area of the workpiece. For this reason, water sprayed onto the processing area of the workpiece hits the processing surface of the workpiece and bounces back, wetting the initial hole processing device itself, so the casing of the initial hole processing device is sealed to prevent moisture from penetrating into the casing. . However, moisture may enter through the sealing part or the bearing of the pipe electrode mounting hole for machining the initial hole protruding from the casing, or the casing may be cooled by moisture, resulting in condensation inside the casing. Water droplets and moisture that seeped in through the sealing part caused rust on the motor, gears, and other components inside the casing of the initial hole processing device, and caused poor insulation and electrical leakage.

Problems to be Solved by the Invention The present invention improves the drawbacks of the prior art described above, prevents dew condensation from occurring in the initial hole processing device, drains moisture from the initial hole processing device, and prevents rust from forming on the components. The objective is to prevent this and eliminate the cause of 1iffi.

Means for Solving the Problems The present invention solves the above problems by providing air suction means and air exhaust means in the casing of the initial hole processing device to ventilate the inside of the initial hole processing device. .

Operation: By air intake means and air exhaust means: By ventilating the initial hole processing equipment, outside air is always introduced into the initial hole and the air is changed.
There is no condensation, and any moisture that has entered from the sealing part etc. is removed by the flowing air and kept in a dry state, so there is no chance of rust on the components in the initial hole processing equipment or generation of a-voltage. .

Embodiment FIG. 1 is a front view of an initial hole processing apparatus according to an embodiment of the present invention, FIG. 2 is a left side view thereof, and FIG. 3 is a top view thereof. Reference numeral 1 denotes an initial ball machining device, in which components such as a motor for driving a pipe electrode 3 for machining an initial hole in a workpiece and a means for energizing the pipe electrode 3 are housed in a case 1a. The casing 1a is sealed to prevent moisture from entering the casing. Reference numeral 2 denotes a mounting plate for mounting on the main body of the wire-cut electric discharge machine, and an air cylinder 4 is fixed to the mounting plate 2. A mounting plate 6 is fixed to the piston rod 5 of the air cylinder 4, and a housing 1a of the initial hole machining device 1 is fixed to the mounting plate 6. That is, the initial hole processing device 1 is fixed to the mounting plate 6, and when the air cylinder 4 is driven and the piston rod 5 extends downward in FIGS. 1 and 2, the initial hole processing device 1 itself also descends. It has become. Further, a spring 7 is stretched between the casing 1a and the mounting plate 2 of the initial hole processing device 1, so that the initial hole processing device 1 is always
It is designed to be pulled upwards in the figure. Note that 8 is a mounting plate 2 that guides the vertical movement of the initial hole processing device 1.
A guide member 9 is a guide piece provided in the initial hole processing device 1. Further, on the upper surface of the housing 1a, there are provided a cable 10 that supplies power to the motor, limit switch, etc. inside the housing of the initial hole processing device 1, and cables 11, 12 and 12 that supply power to the pipe electrode 3 that performs the initial hole processing. A hose 13 for supplying machining fluid water into the pipe electrode 3 and a rod 1 for restricting upward movement by the spring 7 of the initial hole machining device 1
4 is provided. Furthermore, a suction hose 16 for sucking in air and a discharge hose 17 for discharging air are provided in the casing 1a of the initial hole processing device 1, which is a feature of the present invention. In addition, 15 is the pipe electrode 1
This is a hose for spouting water from the outer peripheral surface of No. 3 to the processing area of the workpiece.

Therefore, through the suction hose 16 and the discharge hose 17, the inside of the case of the initial hole processing device [1 is constantly ventilated, and when performing initial hole processing, power is supplied to each cable 10 to 12, and the hose 13 From .15 onwards, water is ejected from the inside and outside of the pipe electrode 3, the air cylinder 4 is driven, and the initial hole machining device 1 is brought close to the work surface to perform initial ball machining. At this time, pipe electrode 3
The water ejected from inside the pipe and from the outer circumference of the pipe hits the work surface and bounces back, wetting the casing 1a of the initial hole processing device 1, but new air is constantly introduced into the casing 1a by the suction hose 16 and the discharge hose 17. Therefore, moisture that has entered through the sealing part is removed, and no dew condensation occurs inside the casing.

Moreover, since the pipe electrode 3 is energized, a ceramic bearing is used for the bearing of the pipe electrode 3 in order to insulate the pipe electrode 3 from other members! This also prevents water from penetrating into the bearing grease and impairing its insulation, causing electrical leakage.

Note that when the initial hole machining is completed and the supply of compressed air to the air cylinder 4 is stopped, the initial hole machining device 1 is moved upward by the air cylinder 4 and placed in the retracted position.

Effects of the Invention As stated above, new air is always introduced into the initial hole processing device, so even if water from the processing fluid enters the casing of the initial hole processing device, the air sucked in and discharged will prevent this. Moisture is discharged, and even if the initial hole processing device is cooled down by the water in the machining fluid, no condensation will form inside the casing, preventing rust from forming on each component of the initial hole processing device and preventing electrical leakage. It does not cause it to occur.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a left side view of the same, and FIG. 3 is a top view of the same. 1... Initial hole processing device, 1a... Case,
2... Mounting plate, 3... Pipe electrode, 4... Air cylinder, 5... Piston rond, 16... Suction hose, 17... Discharge hose. (1 other person) Figure 1 Figure 2

Claims (1)

[Claims] In an initial hole machining device for a wire-cut electrical discharge machine, air suction means and air exhaust means are provided in a sealed casing that houses each component of the initial hole machining device, and external air is introduced into and exhausted from the casing. An initial hole processing device characterized by: