JPH0120021Y2 - - Google Patents

Description

[Detailed description of the invention] A. Industrial application field The present invention relates to a processing device for an orifice hole (see Fig. 3a) opened in a cylinder casing (Fig. 3a shows the state before orifice hole processing). .

B. Prior Art As a conventional orifice hole machining device, there is one shown in FIG. 4, for example.

Turret b that has a rotating main shaft and can move up and down
Either the tool c is attached to the top and the hole is drilled from the outside to the inside, or the tool is rotated and the hole is drilled from the inside.

C. Problems that the invention aims to solve However, with such conventional orifice hole processing equipment, when drilling is performed from the inside rather than the outside, it is difficult to achieve a high-precision finished surface roughness, especially on the inside of the product. If necessary, burrs will be generated on the inside when the hole is completed and deburring will be required, which will impair work efficiency.Also, the method of drilling the hole by rotating the tool from the inside does not require deburring, but the equipment The problem was that it became more complex, larger, and more expensive.

D. Means for Solving the Problems The present invention has been made by focusing on the above-mentioned problems of the conventional punching method, and the punch shaft is moved in a direction orthogonal to the axis of the piston rod by the axial movement of the piston rod. By punching from inside the cylinder casing using a mechanism that changes the operating direction, the generation of burrs on the inner surface of the cylinder casing can be eliminated, and the piston rod guide cylinder that guides and supports the piston rod and punch shaft, and the workpiece. cylinder casing and
By adopting a structure in which each cylinder is fixed to a jig independently without coming into contact with the other, there is no risk of damage to the inner circumferential surface of the cylinder casing, and the overall structure is simplified, smaller, and lower in cost. The aim is to make this process easier and more efficient.

E. Structure of the idea The present invention will be explained below based on the drawings.

Embodiment In Figures 1 and 2, 1 is a hydraulic cylinder 12
2 is a piston rod guide cylinder into which the tip of the piston rod 1 is slidably fitted and guides the axial movement of the piston rod 1; It is fixed to a guide cylinder receiving jig 10 provided on a jig main body (not shown).

A bifurcated cam end 3 having a predetermined slope A with respect to the axis is provided at the tip of the piston rod 1.

Reference numeral 4 denotes a punch shaft having a punch portion 8 for orifice processing at the center of one end, and the punch shaft 4 is slidably fitted into a punch shaft guide hole formed in the piston rod guide tube 2 in a direction perpendicular to the axis. be equipped. A cam receiving part 5 having a slope B matching the slope A of the cam end 3 of the piston rod 1 is formed by chamfering on both sides of the outer periphery of the central portion of the punch shaft 4, and a cam receiving part 5 is formed by chamfering on both sides of the outer periphery of the central part of the punch shaft 4. In the fitted state, the two-pronged cam end 3 of the piston rod 1 fits into the cam receiver 5 and holds the punch shaft 4, as shown in FIG.

Reference numeral 6 denotes a cylinder casing which is a workpiece, and the cylinder casing 6 is provided on the outside of the piston rod guide tube 2 with a gap between the inner circumferential surface of the cylinder casing 6 and the outer circumferential surface of the piston rod guide tube 2, as shown in FIG. The cylinder casing 6 is fitted and set with a predetermined gap therebetween, and the mounting jig 11 sets the orifice hole machining position of the cylinder casing 6 to a position exactly facing the punch portion 8 of the punch shaft 4, and then the guide cylinder receiving jig 10 is attached and fixed.

It goes without saying that the hydraulic cylinder 12 is fixed to a machine base or the like, and the relative positions of the hydraulic cylinder 12 and the piston rod guide tube 2 and cylinder casing 6 fixed to the guide tube receiving jig 10 do not change.

In the state where the cylinder casing 6, which is the workpiece, is attached and fixed to the guide cylinder receiving jig 10 as described above, the hydraulic piston 13 moves inside the hydraulic cylinder 12 to the right in FIG. 1 due to the hydraulic pressure.
When the piston rod 1 moves in the direction of arrow a in FIG.
The punch shaft 4 is guided by the punch shaft guide hole by the slopes A and B, and the piston rod 1
The punch part 8 protrudes outward from the punch shaft guide hole and enters the orifice hole 7 into the cylinder casing 6 from the inner peripheral side.
Open.

The axial stroke amount of the piston rod 1 during the orifice hole machining is regulated by a stopper 9.

When the machining of the orifice hole 7 is completed, the piston rod 1 is
moves in the direction of arrow b in FIG.
The punch shaft 4 is moved in the direction of arrow b perpendicular to the piston rod moving direction by B, the punch part 8 enters the punch shaft guide hole, the piston rod 1 is stopped, the cylinder casing 6 is removed, and the other cylinder casing is then moved as shown above. Set in the same manner as above and perform the same orifice hole machining one after another.

In the above description, the stopper 9 can be adjusted according to the required stroke amount of the punch shaft 4.

In the orifice hole machining work described above, the cylinder casing 6 is attached to the mounting jig 1 with a predetermined gap between the inner circumferential surface of the cylinder casing 6, which is the workpiece, and the outer circumferential surface of the piston rod guide tube 2.
Since it is configured to be fixedly set on the guide tube receiving jig 10 via the piston rod guide tube 1, there is no risk that the inner circumferential surface of the cylinder casing 6 will be damaged by the piston rod guide tube 2.
There is almost no need to consider the accuracy of the outer circumferential surface of the cylinder casing 6, and the overall configuration can be significantly simplified and costs reduced, and the work of setting the cylinder casing 6 can be made easier and more efficient.

F. Effects of the invention As explained above, according to the invention, the configuration is such that the axial movement of the piston rod is made to move the punch shaft in the direction perpendicular to the axis using a gradient, and the punching part punches from inside the cylinder casing. Because of this structure, it is possible to eliminate the occurrence of burrs on the inner diameter side, and only the punch shaft for drilling the orifice hole and the piston rod that operates it are movable, and the piston rod guide tube that guides them and the cylinder casing that is the workpiece are movable. By having a structure in which they are each fixed to the jig independently without contacting each other, the overall structure can be significantly simplified, downsized, and lowered in cost.
In addition, there is no risk of damaging the workpiece, making work easier and more efficient.
This can bring about great practical effects.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a cross section of the main part of the embodiment of the present invention, and Fig. 2 A, B, and C are an enlarged view of the main part in Fig. 1, a bottom view of the main part, and a right side view of Fig. A. It is a diagram. Figure 3 A and B are explanatory diagrams of orifice work;
FIG. 4 is an explanatory diagram of an example of conventional orifice processing. 1... Piston rod, 2... Piston rod guide tube, 3... Cam end, 4... Punch shaft, 5...
...Cam receiving part, 6...Cylinder casing (workpiece), 7...Orifice hole, 8...Punch part,
9... Stopper, 10... Guide cylinder receiving jig, 1
1... Workpiece mounting jig, 12... Hydraulic cylinder, 13... Hydraulic piston.

Claims (1)

[Scope of utility model registration request] A device for machining an orifice hole that opens in a cylinder casing includes a piston rod 1 that is operated in the axial direction by hydraulic pressure and has a two-pronged cam end 3 with a slope A at the end of the rod, and an orifice hole that is machined at one end. A punch shaft 4 having a punch part 8 for use in the punch shaft 4, and a cam receiving part 5 formed of a chamfered part with a slope B into which the cam end part 3 fits on both sides of the outer periphery of the central part.
a piston rod guide tube 2 having a punch shaft guide hole that guides the piston rod 1 so as to be slidable in the axial direction and the punch shaft 4 so as to be slidable in the direction perpendicular to the axis; A guide tube receiving jig 10 that fixes one end of the piston rod guide tube 2 and a cylinder casing 6, which is a workpiece, are mounted with a predetermined gap between the inner peripheral surface of the cylinder casing 6 and the outer peripheral surface of the piston rod guide tube 2. Mounting jig 1 that is attached and fixed to the guide tube receiving jig 10 while being fitted on the outside of the guide tube 2
1. An orifice hole machining device characterized by having a mechanism for converting and operating a punch shaft 4 in a direction perpendicular to the axis by the axial operation of a piston rod 1.