JPH07112659B2 - Method for moving piston and apparatus therefor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for moving a piston and an apparatus therefor, and more particularly to a method for moving a piston excellent in positioning of a piston semi-finished product and an apparatus therefor.

[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 the semi-finished piston products with a conveyor and cut the sprue with a round-blade cutter.Before cutting, position each piston semi-finished product with an air cylinder and a moving support, and then feed it to the round-blade cutter. A moving device for a piston as shown in Fig. 5 was introduced.

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 vertically (or upside down) supplied with the piston reciprocating shaft at the left end of the slide rails 2, 2 as shown in the figure, and the so-called Lift & Carry is repeated by the action of the cylinders 4 and 5, so that the piston 1 with the sliding support 1 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 piston moving processing method and a device therefor capable of feeding a piston semi-finished product to a processing portion in a state of being accurately positioned without a special positioning device. It is in.

[Structure of the Invention] According to the present invention, on a continuously movable conveyor in which a large number of moving blocks composed of a V-shaped abutment and a truncated cone that stands upright almost vertically from the bottom of the V-shaped abutment are connected in series, The piston semi-finished product is supplied on the inlet side so that the truncated cone of the moving block is fitted in the piston pin hole, and the reciprocating shaft as the piston of the piston semi-finished product is arranged almost horizontally. A method for moving and moving a piston (invention 1), characterized in that the piston is moved along and fed to a processing portion, and a V-shaped abutment and a cone which stands upright almost vertically from the bottom of the V-shaped abutment. It is provided with a conveyor for feeding a continuously movable piston semi-finished product held endlessly by connecting a large number of moving blocks consisting of a base in series, and a processing section arranged orthogonally to the conveyor. A featured piston movement processing apparatus (Invention 2) is provided.

Hereinafter, the present inventions 1 and 2 will be described in detail with reference to Examples.

[Embodiment] FIG. 1, FIG. 2, FIG. 3, and FIG. 4 are respectively an overall perspective view, an enlarged perspective view of a processing portion, a side view of a moving portion, and IV-IV ′ of FIG. FIG.

In FIG. 1, 100 is a moving part (conveyor), 200 is a processing part (band saw driving device) orthogonal to the moving part, 300 is a gate spouted piston semi-finished product discharge conveyor, and the conveyor 10
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 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. Board 29
On the upper side, slide rails 90, 90 are slidably supported on both sides. On the other hand, on the lower side, the moving block 30 is supported by the lower slide rails 95, 95 so that the roller chain loop does not hang down.

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 gated piston and the band saw 32 can be adjusted individually, but the entire adjustment can be easily performed by the screw shaft driven by the handle 210 in FIG.

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, it is important to fit the truncated cone 30A into the tapered piston pin hole at this stage and to support the piston body by the V-shaped abutment 30B having a gradient in the 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. Similarly, the V-shaped abutment can also be 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. There is a tendency for the left end 30C to tilt and rise, resulting in inaccurate positioning of the piston semi-finished product.To prevent this rise, the left end 30C of the moving block
It is also possible to press and support C from above with a roller 55. Laura 5
Reference numeral 5 is made of metal, hard rubber or plastic, and is supported by a support plate 54 fixed to the side wall of the conveyor main body so as to be adjustable in the vertical direction, and is pivotally attached to a support arm 56 screwed to the support plate 54.

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.
A piston mounted on the moving block 30 in a state of being pressed downward by four coil hoops 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 semi-finished product by sliding.

This makes it possible to more 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.

[Operation of the Invention] The operation of the present invention is as follows.

First, a piston semi-finished product is supplied to the entrance side of a horizontal conveyor in which a large number of moving blocks are connected in series. The piston semi-finished product is fed to the processing section while being accurately positioned on the moving block, and the sprue is cut. In this case, since the piston semi-finished product is fixed by the truncated cone of the moving block and the V-shaped abutment, the time required for the positioning operation does not require a complicated positioning device such as the conventional bolt nut and fluid pressure cylinder.・ Manpower can be omitted.

[Effects of the Invention] By carrying out the present inventions 1 and 2, all of the above objects can be achieved.

That is, the piston semi-finished product can be accurately positioned and fed to the processing portion without a special positioning device.

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]

1, 2, 3, and 4 are an overall perspective view, an enlarged perspective view of a processing part, a side view of a moving part, and a third view of an embodiment of the present invention, 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 …… moving part, 200 …… processing part, 300 …… discharging conveyor, 1 …… piston semi-finished product, 1A …… gate, 29 …… substrate, 30 …… moving block, 30A …… frustum, 30B …… V Character-shaped abutment, 32 …… band saw, 40 …… roller chain, 50 …… sled.

Claims (4)

[Claims] 1. A cone of each moving block on a continuously movable conveyor in which a large number of moving blocks, each of which is composed of a V-shaped abutment and a truncated cone which stands upright from the bottom of the V-shaped abutment, are connected in series. The piston semi-finished product is supplied on the inlet side so that the table is fitted in the piston pin hole, and the reciprocating shaft as the piston of the piston semi-finished product is arranged almost horizontally, and the piston semi-finished product is moved along the reciprocating shaft in its posture. The method of moving the piston is characterized by the fact that it is fed to the processing section. 2. The semi-finished piston product is a piston with a sprue,
The piston moving processing method according to claim 1, wherein the processing unit is a gate cutting device. 3. A semi-movable piston semi-finished product which is endlessly held by connecting a plurality of moving blocks in series, each of which is composed of a V-shaped abutment and a truncated cone which is vertically upright from the bottom of the V-shaped abutment. A moving processing apparatus for a piston, comprising a conveyor for feeding and a processing unit arranged orthogonal to the conveyor. 4. The piston semi-finished product is a piston with a sprue,
The piston moving processing device according to claim 3, wherein the processing portion is a gate cutting device.