JPH045226Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field of the invention This invention uses a member with holes of two different diameters.
Regarding the hole reference jig device used when machining one of the holes as a reference, more specifically, the reference pin is driven by a two-stage cylinder and a bell crank-shaped cam by switching operations such as a switch, and the reference pin is driven by a switching operation such as a switch. This article relates to a high standard jig device that aims to improve efficiency.

Conventional technology and its problems For example, when machining a member that has two holes with different inner diameters, such as a connecting rod for an internal combustion engine, two
In many cases, a reference pin is inserted into one of the two holes, fixed, and then machined. However, conventionally,
Since different types of stove rods have different hole diameters, it is necessary to remove the reference pin that has been used and replace it with another one each time, which causes a decrease in efficiency.

Purpose of the invention and its structure The purpose of the invention is to provide a hole reference jig that allows easy switching drive of reference pins that fit into each hole of a member having two holes with different diameters by operating a switch or the like. Its structure is such that the tip is formed into a small reference diameter part, the part following this small reference diameter part is formed into a large reference diameter part, and the rear end has a concave cam in the direction that intersects the axis. a bell-crank-shaped cam having one arm tip formed in a convex cam portion that can freely slide on the inner surface of the concave cam portion of the reference pin; and the other arm portion of the cam. It is characterized by comprising a two-stage piston that has a concave cam part at one end that allows a convex cam part formed at the tip to freely slide into contact, and a cylinder that accommodates this two-stage piston so that it can be driven in stages. There is.

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, the reference pin indicated by reference numeral 1 has a tip formed in a small reference diameter portion 1A, and this small reference diameter portion 1A.
While forming the part following A into the large standard diameter part 1B,
A concave cam portion 1C is formed at the rear end. The concave cam portion 1C is, for example, a square hole in a direction perpendicular to the axis of the reference pin 1, and is designed to allow the convex cam portion 3 formed at the tip of one arm portion 2A of the bell crank-shaped cam 2 to fit and slide into it. be.

The cam 2 rotates around a horizontal shaft 5 supported on the frame 4 at a position below the rear of the reference pin 1, causing the reference pin 1 to move in the axial direction. A convex cam portion 6 is formed at the tip of the other arm portion 2B of the cam 2. The convex cam portion 6 is slidably fitted into a concave cam portion 8 formed at the upper end of the two-stage piston 7.

The two-stage piston 7 is a stepped shaft member to which a pressure receiving member 11 that moves within a driving pressure chamber 10 formed at the lower part of a cylinder 9 attached to the frame 4 is fixed, and whose upper part is formed into a small diameter part 7A. be.

The upper part of the cylinder 9 is formed into a stroke control pressure chamber 12 , and a pressure receiving plate 13 having a larger effective pressure receiving area than the pressure receiving member 11 through which the small diameter portion 7A of the second stage piston 7 is inserted is inserted into the chamber 12 .
is housed movably in the axial direction. The two-stage piston 7 stops rising at a position where the stepped portion a, which is the boundary between the small diameter portion 7A and the large diameter portion 7B, comes into contact with the lower end surface of the pressure receiving plate 13. That is, when the pressure receiving plate 13 is in the position shown in FIG. The stepped portion a contacts and the second stage piston 7 does not rise any further. At this time, the reference pin 1 is designed so that only its small reference diameter portion 1A is in a position protruding from the workpiece mounting member 4a of the frame 4.

When the pressure-receiving plate 13 moves to the raised position, the two-stage piston 7 integrated with the pressure-receiving member 11 whose lower surface receives fluid pressure rises, and the large reference diameter portion 1B protrudes from the workpiece mounting member 4a. becomes. In addition,
The driving pressure chamber 10 and the stroke control pressure chamber 12 of the cylinder 9 each have ports 14, 15 and 16, 17 through which fluid pressure can be freely supplied and discharged.

In addition, the position of the second stage piston 7, that is, the illustrated state in which only the small reference diameter portion 1A at the tip of the reference pin 1 protrudes from the workpiece attachment member 4a of the frame 4, and the large reference diameter portion from the workpiece attachment member 4a. A state in which up to part 1B protrudes (a state in which the pressure receiving plate 13 has moved to the raised position and the second stage piston 7 has moved to the upper limit)
Limit switches 18, 19, and 20 are provided to detect the state in which the reference pin 1 does not protrude from the workpiece mounting member 4a and to control the operation of an electromagnetic switching valve (not shown) that opens and closes the fluid pressure circuit. be.
21 is a clamper for attaching the workpiece to a predetermined position, and 22 is a cylinder for tightening the clamper 21.

The device of the present invention having the above-mentioned configuration can, for example, connect a connecting rod C having two holes C ₁ and C ₂ of different diameters.
Attach it to the frame 4 using each hole as a reference,
When performing the specified processing, port 1 of cylinder 9
6 to supply pressure to the stroke control pressure chamber 12,
When the pressure is exhausted from the port 17, while the pressure is supplied from the port 14 and the pressure is exhausted from the port 15, the second stage piston 7 rises, but its step part a comes into contact with the pressure receiving plate 13 and stops rising (as shown in Fig. 3). situation).
In this state, only the small reference diameter portion 1A protrudes from the workpiece mounting member 4a of the frame 4, and the connecting rod can be supported on the small diameter hole reference.

Next, when the port 17 is switched to the supply pressure side and the port 16 is switched to the exhaust pressure side, the pressure receiving plate 13 moves upward from the illustrated position, and the port 14 communicates with the supply pressure side and the port 15 communicates with the exhaust pressure side. The pressure receiving member 11 can now rise within the driving pressure chamber 10, and up to the large reference diameter portion 1B of the reference pin 1 protrudes from the workpiece attachment member 4a.
In this state, the connecting rod can be supported and processed on the frame 4 with reference to the large diameter hole.

Furthermore, port 15 is set to the pressure supply side, and port 1
4 to the exhaust pressure side, the second stage piston 7 moves to the lower limit position, and the tip of the reference pin 1 touches the frame 4.
It retreats to a position where it does not protrude into the workpiece attachment member 4a. In this state, the workpiece is attached to the workpiece mounting member 4a.
cannot support it.

Effects The present invention has the above-mentioned configuration, and the switching operation of the reference pin can be performed by simply switching the fluid pressure pipe, so there is no need to re-setup each time, and efficiency is greatly improved. be able to. In addition, conventionally, when a certain reference pin was attached, the holes in the conrod had to be machined using a rotary machine, but with the device of this invention, the holes in different types of conrods can be machined randomly. is also possible. In the case of the automated production line, it is possible to operate in a pre-sequenced order, and the workpiece can be detected and the reference pin can be automatically operated, which has excellent advantages that are useful for automating hole-based machining. has.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing the entire device of the present invention with some parts omitted, and FIG. 2 is a front view thereof. 1...Reference pin, 1A...Small reference diameter section, 1B...
...Large standard diameter part, 1C...Concave cam part, 2...Cam, 2A, 2B...Arm part, 3...Convex cam part, 4
...Frame, 4a... Workpiece mounting member, 5...
Shaft, 6... Convex cam portion, 7... Two-stage piston, 7
A...Small diameter part, 7B...Large diameter part, 8...Concave cam part, 9...Cylinder, 10...Driving pressure chamber,
11... Pressure receiving member, 12... Stroke control pressure chamber, 13... Pressure receiving plate, 14, 15, 16, 1
7... Boat, 18, 19, 20... Limit switch.

Claims (1)

[Scope of utility model registration request] A reference pin having a tip formed as a small reference diameter portion, a portion following the small reference diameter portion being formed as a large reference diameter portion, and a rear end provided with a concave cam portion in a direction intersecting the axis; A bell crank-shaped cam has one arm tip formed on a convex cam portion that can freely slide into the inner surface of the concave cam portion of the pin, and a bell crank-shaped cam that has one arm tip formed on the other arm tip of the cam. A two-stage piston that has a concave cam portion at one end that allows free sliding contact;
A hole reference jig device comprising a cylinder in which a step piston is housed so that it can be driven separately.