JPS6171133A - Method and device for punching master cylinder compensating hole - Google Patents

Abstract

PURPOSE:To work a compensating hole without generating a chip and a burr by inserting a punch arbor and a punch rod which has formed an inclination partially, into a center hydraulic pressure chamber of a master cylinder, and executing a punching. CONSTITUTION:A master cylinder base material 8 is fixed to a jig of a work fixing part, a punch arbor 1 of a punching part is inserted into a hole 8C of the base material 8, and a stepped part 1a is advanced to a position of the jig. When a punch rod 2 moves an inner hole 1b of the punch arbor 1 in the right direction, a punch holder 3 moves in the straight direction along an inclination of a slant face part 10, and a punch 4 of the tip of the punch holder 3 works a wall 8c which a compensating hole 8a does not pass through. In this way, the compensating hole 8a is made to pass through in a state that a burr, a chip, etc. have been generated in only a reservoir side.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to a method and apparatus for machining a brake fluid flow hole in a master cylinder used as a braking device of an automobile. It is widely used in the processing of

(Prior art) In the two through holes that communicate the central hydraulic chamber and the reservoir of the master cylinder, the small diameter through holes (hereinafter referred to as compensation holes) are generally machined inward from the reservoir side, which is the outside of the cylinder, as follows: The street is being processed.

(1) In the case of drilling In the case of drilling, large burrs and chips are generated on the inner surface of the cylinder because the brake cylinder material is fixed and the hole is drilled from the outside.

For this reason, after drilling, it is necessary to remove chips from the inside of the cylinder with a brush, and then use a reamer to remove the chips. Therefore, three steps are required to process this compensation hole, which requires equipment and manpower.Furthermore, even if deburring is performed, some deburring may remain, and it is necessary to perform a complete check from the inner surface using an endoscope.

(2) In the case of electric discharge machining, electric discharge machining fixes the brake cylinder material and melts the material while applying electrolyte from the outside to drill the hole. Although it does not generate chips, the machining time is extremely long and productivity is low. ,
Furthermore, if the electrode or the like swings, spatter may adhere to the area around the hole on the inner surface, so it is necessary to check the number of copies using an endoscope from the inner surface during this processing as well.

In this way, if particles and chips remain on the inner surface of the master cylinder, the piston cup that reciprocates the cylinder will be damaged when the brake is released, causing oil leakage, and furthermore, the braking pressure will not increase, making it impossible to brake.

In addition, chips and particles may be removed by the brake fluid pressure before damaging the piston cup, but if the chips fall into the cylinder and get stuck in the valve mechanism that controls the brake pressure, braking force will no longer be obtained. As a result, the brake is difficult to apply, and there is a problem that the braking force release time becomes long, especially when the compensation hole is blocked by cutting burrs or burrs.

(Problems to be Solved by the Invention) Therefore, the technical object of the present invention is to provide a method and device for machining a compensation hole that does not cause chips or particles to become trapped inside the master cylinder when machining the compensation hole of the master cylinder. It is something.

[Structure of the invention]

(Means to solve the problem) The technical measures taken to solve the above technical problem are:
In drilling the compensation hole of the master cylinder, the compensation hole is punched outward from the hydraulic pressure chamber on the inner surface of the master cylinder toward the reservoir side. In other words, in a brake fluid flow hole processing device consisting of a punch processing section, a workpiece processing section, and a punch slide section, a master cylinder (hereinafter referred to as the material) in which a hydraulic chamber, a reservoir hole, and a compensation hole are semi-processed through the center of the mask cylinder is used. ) is fixed to the workpiece fixing part, and the punch arbor and punch rod provided in the punching part are operated to open a compensation hole in the material.

r''rad into the material, and the diagonal 1f of the punch rod.
11 Yamabayashi'J [J+ f:: J, ゛C A punch holder that operates up and down is d-) A punch holder with a diameter of approximately 0.5 m is fixed to the punch/IS holder, and a punch holder with a diameter of approximately 0.5 m is fixed to the punch IS holder. When the rod moves from side to side with a force of approximately 100 kg, the punch rod and punch move up and down, punching out the bottom wall portion of the wall with a wall thickness of approximately IB corresponding to the compensation hole from the inside to the outside, thereby forming the compensation hole. It is something that forms.

(Operation) The above technical means operates as follows. In other words, a part of the taper is provided at the position corresponding to the compensation hole of the punch rod that moves left and right inside the master cylinder, and the cylinder weighs approximately 100 kg.
A punch with a thickness of about 0.5 va is applied from the inside to the outside of the master cylinder by a punch attached to a punch holder that moves accurately up and down along the taper part of the punch rod that is operated by hydraulic pressure. Then, the above-mentioned compensation hole is drilled, and although pars and chips may be generated on the reservoir side, they are not generated on the master cylinder side at all, so there is no need to remove pars or chips. This also eliminates the need for inner laminar processing.

(Example) Examples of the above technical means will be described below.

A is a brake fluid flow hole processing device according to the present invention, which is composed of a punch processing section B, a workpiece fixing section C1, and a punch slide section.

In the punching part B, 1 is a punch arbor with a stepped 1a
2 is a punch rod, 3 is a punch holder, and 4 is a 0.51 mφ punch attached to the punch holder. A punch cylinder 5 operates the punch rod 2.

The workpiece fixing section C transports a material 8 (not shown) to the master cylinder mounting jig 6, mounts it at a prescribed position, and transports it again to the right position after processing is completed.

The punch slide section is composed of a punch slide par 7, a punch head unit cylinder 9, etc., and moves the entire punch processing section B toward the workpiece by the action of the cylinder 9.

The punch rod 2 is the compensation hole 3 of the master cylinder material 8
There are inclined surface portions 10 and 11 at positions corresponding to a and 8b.

This sloped surface portion has a hole 10 into which the punch holder 3 is inserted and a narrow groove 10b, and the punch 4 is fixed to the punch holder 3 and a groove 3a that fits and slides on the sloped surface.

To explain its function in the above configuration, the master cylinder blank 8 is fixed to the jig 6 of the work fixing part B, and the punch slide part is moved to the right by the operation of the cylinder 9, and the punch arbor 1 of the punch processing part is moved. The cylinder 5 is inserted into the hole 8C of the material 8 and the stepped portion 1a is advanced to the position of the jig 6a. In this case, the cylinder 5 is set in advance so that the punch holder is accurately positioned below the compensation holes 3a and 8b. .

Next, the punch rod 2 moves to the right through the inner hole 1b of the punch arbor.At this time, the punch holder 3 moves in a straight direction (radial direction) along the slope of the slope portion 10, and the tip of the punch holder 3 moves to the right. The punch 4 is used to punch the wall 8c which the compensation hole 8a does not pass through so as to penetrate the compensation hole, and particles, chips, etc. are generated on the side of the reservoir side 8d.

After passing through the compensation hole, when the puncher 2 is moved to the left by operating the cylinder 5, the punch holder 3 descends along the slope and moves to the hole 10a of the puncher 2.

Thereafter, the puncher 2 is removed from the material 8, the entire punching section is moved to the left, and the material 8 after processing is removed from the jig and transported.

C Effect of invention] The present invention produces the following unique effects.

(1) As a functional effect of the product, the punched through holes are completely free of chips and debris, and the inner surface is clean, preventing cup damage, oil leaks, and brakes caused by automobile brake systems. (2) As an effect in terms of product cost, the processing time is extremely short and no post-processing is required, and the equipment cost is also lower than other methods, making it a huge improvement. This results in cost reduction.

[Brief explanation of the drawing]

FIG. 1 is a simplified side view of this embodiment, showing the process diagram of the punch holder, (a) is a diagram of the previous process, and (b) is a diagram of the completed process.

Claims (2)

[Claims] (1) In a master cylinder material in which the central hydraulic pressure chamber and the reservoir mounting hole of the master cylinder are machined, and a part of the bottom wall of the compensation hole having a small diameter is left unfinished, the central hydraulic pressure chamber of the master cylinder is partially machined. A punch rod having a punch arbor and a partially inclined surface is inserted into the hole, a punch holder having a punch is engaged with the punch rod, and the punch rod is moved to open the half-machined portion of the compensation hole from the inside of the master cylinder. A method of machining compensation holes in the master cylinder by punching. (2) In a brake fluid flow hole processing device consisting of a punch processing section, a workpiece fixing section, and a punch slide section, a punch arbor that is inserted into the master cylinder is provided in the punch processing section, and a punch rod that moves within the punch arbor is inserted. The punch rod is provided with an inclined part at a position corresponding to the compensation hole of the master cylinder, and a punch passing through the compensation hole is provided at the upper end of the punch holder that slides on the inclined part and moves up and down. Processing equipment.