JPH0741505B2 - Work transfer / processing equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a work transfer / processing apparatus, and more particularly to a work transfer / processing apparatus having excellent work positioning properties.

[Prior Art and Problems] A piston semi-finished product for a reciprocating internal combustion engine, which is conventionally produced by casting an Al-Si alloy or the like, is in a state without a casting and has a gate, and in that state, it is to be subjected to subsequent machining. I can't.

Initially, the gate was manually cut and removed, but this was extremely inefficient and the cost was not necessarily low.

Therefore, the basic layout is to feed workpieces such as semi-finished piston products with a conveyor and cut the gate with a round blade cutter.
A piston moving processing apparatus as shown in FIG. 5 was introduced, in which each piston semi-finished product was positioned by an air cylinder and a moving support immediately before cutting and then fed to a round blade cutter.

FIG. 5 is a perspective view of a conventional piston moving and working device.

In FIG. 5, 1 is a gated piston (piston semi-finished product), 2 is a slide rail for piston movement, 3 is a finger, 4 is a cylinder for horizontally driving the finger, 4A is a support base for the cylinder 4, and 5 is a support base. 4A lifting cylinder.

Further, 15 is a mount, 6 and 6 are slide rails, 7 is a moving support base, and 10 is a fixture, which is a little lower than the slide rails 2 and 2. Reference numeral 9 denotes a moving fixture, which is horizontally moved by a cylinder 8 fixed to the moving support base 7 and clamps the gated piston on the moving support base 7. In addition, this last lift
11 rises in advance and gently lowers the fed piston 1 with a gate, and finally it fits in the recess and the upper surface becomes flush with the upper surface of the movable support base 7.

20 is a motor, 21 is a V belt, 22 is a round blade cutter, 23 is a piston pushing cylinder, and 24 is its pusher.

The gate with piston 1 is supplied vertically (or upside down) with the piston reciprocating shaft at the left end of the slide rails 2 and 2 as shown in the figure. It is supplied by moving to the stroke.

As mentioned above, the level of the fixture 10 is the slide rails 2,2
Since it is lower than the level, the sprue-headed piston falls between the fixture 10 and the moving fixture 9 and is positioned and gripped by clamping.

However, in such a conventional device, the sprue-equipped piston 1 is difficult to be accurately positioned on the movable support base 7, and it often tilts or falls, so that the circular blade 22 rotating in the direction of arrow Z (this Is driven by the motor 20 through the V-belt 21 and the pulley.), The gate is not accurately and efficiently cut even if it is fed by moving the movable support base 7 in the X direction, and a defective product is generated. was there.

As a mechanism, after the sprue is cut by the round blade cutter 22, the movable support base 7 reaches the right end of the slide rails 6, 6 and the movable fixture 9 is retracted. At this time, the orthogonal reject cylinders 23 are operated and the pusher 24 is pushed. Had rejected the semi-finished piston with the sprue cut to a chute prepared in the direction of arrow R.

However, even here, there is a problem that the release of the clamp does not go smoothly and catches, falls, or does not enter the chute, and it is very unstable and it is difficult to secure the operating rate.

Further, when a round blade cutter is used, there is a problem that it is impossible to prevent seizure, to secure the life of the blade and to avoid the blackening phenomenon caused by the heat treatment in the subsequent process unless the selected emulsion oil coolant flows down.

In addition, the use of emulsion oil coolant inevitably has the problem of deteriorating the working environment.

Also, with the same basic layout, just before cutting, the piston semi-finished product is positioned with the vertically arranged air cylinder and the fixed support base, and then the moving sprue cutter cuts the sprue of the piston. A moving processing device for a piston that has a structure in which it is moved backward and then by another horizontal air cylinder is used to extrude the sprue-free piston semi-finished product and drop it onto a belt conveyor located below, was introduced into a part of the piston manufacturing line. .

However, accurate positioning of the semi-finished piston product on the movable support or the fixed support seems to be easy at first glance, and it has been difficult to get along with each other.

The reason is that the shape of the piston semi-finished product is not constant including the sprue and it is difficult to accurately position and support the posture of the semi-piston semi-finished product with the conventional positioning support base and its structure.

Therefore, the present inventors have conceived that positioning and feeding can be performed by utilizing a piston pin hole which is relatively accurately formed by a mold in the casting stage, and as a result of earnest research, the present invention has been completed.

[Object of the Invention] An object of the present invention is to provide a work transfer / working apparatus capable of feeding a work such as a piston semi-finished product to a working unit in a precisely positioned state without a special positioning device. It is in.

Another object of the present invention is to provide a work transfer / processing apparatus which prevents the moving block from rising during processing.

[Structure of the Invention] According to the present invention, a workpiece that is a semi-finished piston with a gate is provided with a V-shaped abutment and a V-shaped support.
An endless track composed of a truncated cone that is upright from the bottom of the V-shaped abutment, and a plurality of moving blocks that fit the truncated cone into the piston pin hole of the work and support it, and a drive support mechanism thereof. In a work transfer / processing apparatus having a processing unit arranged orthogonally to the work transfer direction, the moving block has a V-shaped shape on one side closer to the processing apparatus than the transfer center of the infinite track so that the gate of the work can be easily cut off. Cross section arm where the abutment and the truncated cone are offset and extend to the opposite side
A roller 55 which is a moving block including 30C and which is pivotally attached to a support plate 54 fixed to the side wall of the drive supporting mechanism of the endless track so as to be adjustable in the vertical direction and presses the cross-section arm portion 30C of the moving block.
And a work transfer / processing device (claim 1), which is capable of stable continuous transfer / processing of the work, and the endless track is a roller chain or a toothed belt, and the processing part is a band saw and its drive. A work transfer / processing apparatus (claim 2) according to claim 1 which is a mechanism is provided.

The present invention will be described in detail below with reference to examples.

[Embodiment] FIG. 1, FIG. 2, FIG. 3, and FIG. 4 are perspective views of an embodiment of the present invention, an enlarged perspective view of a processing section, a side view of a transfer section, and IV-IV ′ of FIG. 3, respectively. FIG.

In FIG. 1, 100 is a conveyor (conveyor), 200 is a machining section (band saw drive device) orthogonal to the conveyor, and 300 is a conveyor for discharging a spigot-finished piston semi-finished product.
The motors 0 and 300 are driven synchronously by a single motor 250 via a roller chain 251.

1 to 4, the conveyor 100 has a sprocket shaft 43 and a driven wheel shaft 44 whose position can be adjusted by a screw shaft 46.
The roller chain 40, which is an endless track, is mounted between the sprocket 42 and the driven wheel 45, and the roller chain 40 is fixed to the substrate 29 via the bracket portion 41. The board 29 is slidably supported on both sides by slide rails 90, 90 on the upper side. On the other hand, the lower slide rails 95, 9 are on the lower side to prevent the roller chain loop from hanging.
The moving block 30 is supported by 5. The endless crawler belt may be a toothed belt or a crawler other than the roller chain.

On the base plate 29, a moving block 30 is fixed by slotted holes and bolts and nuts so as to be adjustable in the width direction. Therefore, the distance between the gate piston and the band saw 32 can be adjusted individually, but the overall adjustment can be easily performed by the screw shaft driven by the handle 210 shown in FIG.

This screw shaft may be driven by a motor, or may be replaced by a fluid pressure cylinder.

Therefore, a work shape sensor is provided on the entrance side of the transport unit, and the deviation of the size of each part is read and stored and calculated by a computer.
It is also possible to feed back to the screw shaft and the fluid pressure cylinder to perform accurate automatic machining regardless of the shape of the work.

The shape of the moving block 30 is shown most clearly in FIG.

That is, basically, even with semi-finished piston products of different sizes, a V-shaped abutment is formed so that the reciprocating shaft as the piston accurately follows the conveyor moving direction, and stands upright in a substantially vertical direction from the bottom of the V-shaped abutment. A truncated cone is provided.

The angle θ formed by the V-shaped abutment and the horizontal is 30 ° ≦ θ ≦ 60 °, and preferably 42 ° to 47 °. The truncated cone has a taper angle of 0.5 ° to 5 °, which is about 3 ° in this embodiment.

It is desirable that the truncated cone has a diameter of 90 to 99% of the diameter of the piston pin hole so that it can be easily fitted into the piston pin hole of pistons of different sizes.

In the as-cast condition, the piston pin hole is tapered with a slightly larger inlet diameter on both sides to facilitate mold removal. However, this piston pin hole is machined later into a flat hole.

In the present invention, the truncated cone 30A can be fitted into the tapered piston pin hole at this stage, and the piston body can be supported by the V-shaped abutment 30B having a gradient in the substantially tangential direction.

If the truncated cone 30A is screwed into the moving block 30, the truncated cone can be exchanged, and the height and size can be easily adjusted. The V-shaped abutment can also be made removable.

Further, in FIG. 4, since the moving block is offset to the right side (band saw side) in the width direction, the band saw moves at a high speed downward, especially when cutting the sprue. The left end 30C of the moving block tends to rise and the positioning of the piston semi-finished product will be inaccurate as a result, so the left end 30C of the moving block is pressed and supported by the roller 55 from above to prevent this rise. This is extremely important in the present invention.

The roller 55 is made of metal, hard rubber or plastic,
Support plate 54 that is vertically adjustable and fixed to the side wall of the conveyor body
Is supported by and is pivotally attached to a support arm 56 screwed to the support plate 54.

In addition, the roller 55 is a spring that biases itself downward,
It can be supported via a fluid pressure cylinder or the like.

If necessary, a pair of sleds 50, 50 for elastically reducing the piston semi-finished product 1 may be arranged above the moving block 30.

The sleds 50, 50 are lifts 11 fixed to the outer wall of the conveyor 100.
Piston semi-finished product loaded on the moving block 30 in a state of being pressed downward by four coil springs 51, 51, 51, 51 arranged on a support base 52 adjustable up and down by a screw shaft 110 of 1. Hold the upper part of the slide.

By doing so, it is possible to accurately position the piston semi-finished product during cutting.

Also, during cutting processing, the gold saw 3 that is accurately supported by the rollers 33, 33
No. 2 descends at a high speed of, for example, 300 to 500 m / min to cut the sprue, but at this time, it is not necessary to flow down a large amount of emulsion coolant as with a round blade cutter, and a small amount of waste operating oil can be dropped.

In addition, other cutting means include guillotine shear, water knife with ultra-high pressure water jet, TIG jet (plasma jet), laser beam, electron beam (in vacuum),
It is also possible to adopt electric discharge machining (in the medium).

It is of course possible to use a row of rollers, a linear bearing, a crawler or the like instead of the sleds 50.

[Effects of the Invention] By carrying out the present invention, all of the above objects can be achieved.

That is, the work can be accurately fed to the processing unit without a special positioning device. Also, even if the moving block is offset in the width direction of the infinite track, the opposite side does not float, and accurate positioning of the work is maintained.

In addition, the product is less likely to be damaged than the conventional means, and the operation rate of the line itself is significantly improved.

One type of moving block can be used for piston semi-finished products of different sizes.

[Brief description of drawings]

FIG. 1, FIG. 2, FIG. 3, and FIG. 4 are an overall perspective view of an embodiment of the present invention, an enlarged perspective view of a processing section, a side view of a transfer section, and a third view, respectively.
FIG. 4 is a sectional view taken along the line IV-IV ′ in FIG. 5, and FIG. 5 is an overall perspective view of a conventional device. 100 …… Conveyor section, 200 …… Processing section, 300 …… Discharge conveyor, 1 …… Piston semi-finished product, 1A …… Gate, 29 …… Substrate, 30 …… Movement block, 30A …… Frustum, 30B …… V Character-shaped abutment, 32 …… band saw, 40 …… roller chain, 50 …… sled, 55 …… roller.

Claims (2)

[Claims] 1. A workpiece, which is a semi-finished product of a piston with a gate, is
It consists of a V-shaped abutment and a truncated cone that stands upright from the bottom of the V-shaped abutment.
An infinite crawler belt in which a large number of moving blocks that fit and support the circular truncated cone are fitted in the piston pin holes of the work, are connected in series, a drive support mechanism thereof, and a processing unit that is arranged orthogonally to the work transfer direction. In the work transfer / processing equipment,
The V-shaped abutment and the truncated cone are offset to one side closer to the processing device than the transport center of the infinite track so that the moving block can easily cut the gate of the work, and the cross-section arm portion 30C extending to the opposite side is provided. It is a movable block equipped with a roller 55 that is pivotally attached to a support plate 54 fixed to the side wall of the drive support mechanism of the endless track so as to be adjustable up and down, and presses the cross-section arm portion 30C of the movable block.・ Work transfer / processing equipment characterized by being capable of processing. 2. The endless track is a roller chain or a toothed belt, and the processing section is a band saw and its driving mechanism.
Work transfer / processing device described in.