JPH0425338A - Piston travel machining method and its device - Google Patents

Abstract

PURPOSE:To supply a piston semi-finished product in the condition where it is positioned accurately by fixing the piston semi-finished product provided with a gate by arranging a piston shaft horizontally, and moving the block to a machining section continuously. CONSTITUTION:A travel machining device of a piston semi-finished product 1 is provided with a conveyor 100 which is held in a endless manner by connecting many travel blocks 30 consisting of a V-shaped support base 30B and a truncated cone base 30A which stands almost vertically from the bottom of the support base 30B in series and a machining section 200. The piston semi- finished product 1 is supplied to the machining section 200 by arranging a reciprocal shaft as a piston horizontally and moving it along the reciprocal shaft. That is, on the conveyor 100 on which many travel blocks 30 consisting of the V-shaped support base 30B and the truncated cone base 30A are connected in series the piston semi-finished product 1 is supplied on the inlet side so that the truncated cone base 30A is engaged with a piston hole, and supplied to the machining section 200 in the posture, and a gate 1A is cut by a band saw 32.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application 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 and an apparatus therefor that are excellent in positioning a semi-finished piston.

[Prior art and issues] Conventionally, piston pin products for reciprocating internal combustion engines manufactured by casting Af-8i alloys, etc., are in a state where a sprue is attached, and in that state, they cannot be subjected to subsequent machining. I can't do anything.

Initially, the sprues were cut and removed by hand, but this was extremely inefficient and the cost was not necessarily low.

Therefore, we adopted a basic layout in which semi-finished piston products are fed by a conveyor and the sprue is cut with a round blade cutter, and immediately before cutting, each semi-finished piston product is positioned with an air cylinder and a movable support stand, and then fed to the round blade cutter. A piston moving processing device as shown in Figure 5 was introduced.

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

In Fig. 5, 1 is a piston with sprue (piston semi-finished product), 2 is a slide rail for moving the piston, 3 is a finger, 4 is a cylinder for horizontally driving the finger, 4A is a support stand for the cylinder 4, and 5 is a support stand. It is a 4A lifting cylinder.

Further, 15 is a frame, 6, 6 are slide rails, 7 is a movable support base, and 10 is a fixture, which is at a slightly lower level than the slide rails 2, 2. Reference numeral 9 denotes a movable fixture which is horizontally moved by a cylinder 8 fixed to the movable support base 7 and clamps the sprue-equipped piston onto the movable support base 7. It should be noted that this last elevating table 11 has been raised in advance and allows the fed piston 1 with a sprue to be lowered quietly, so that it finally fits into the recess and its upper surface becomes flush with the upper surface of the movable support table 7.

20 is a motor, 21 is a V-belt, 22 is a round blade cutter, 2
3 is a piston extrusion cylinder, and 24 is its button.

The sprue-equipped piston 1 is supplied with a piston reciprocating axis vertically (or inverted) as shown in the figure at the left end of the slide rails 2, 2, and is operated by the so-called Lift&C by the action of the cylinder 4.5.
By repeating ``arry'', one stroke is moved and supplied onto the movable support table 7.

As mentioned earlier, the level of the fixture 10 is the slide rail 2.
.

However, in such a conventional device, it is difficult to accurately position the sprue piston 1 on the movable support 7, and the piston 1 often tilts or falls over. is the V-belt 21 from the motor 20.
and is driven via a pulley. ), the movable support stand 7
Even if the sprue is fed by moving in the X direction, the sprue cannot be cut accurately and efficiently, resulting in defective products.

In addition, as for the mechanism, after cutting the sprue with the round blade cutter 22, the movable support base 7 reaches the right end of the slide rail 6.6 and the movable fixture 9 retreats, and at this time, the orthogonal jet cylinder 23 works, The pusher 24 was designed to reject the piston semi-finished product which had been cut by hot water bath into a chute prepared in the direction of arrow R.

However, here too, there were problems in that the clamp could not be released properly, causing the device to get stuck, fall over, or not enter the chute, making it extremely unstable and making it difficult to maintain a high operating rate.

Furthermore, when using a round blade cutter, there is a problem that unless a specially selected emulsion oil coolant is flowed down, it is impossible to prevent seizure, ensure the life of the cutter, and avoid the blackening phenomenon that occurs during heat treatment in the post-process.

Furthermore, the use of emulsion oil coolant inevitably poses the problem of worsening the working environment.

In addition, with the same basic layout, the piston semi-finished product is positioned with a vertically arranged air cylinder and a fixed support just before cutting, and then the sprue of the piston is cut with a movable round blade cutter, and after cutting, the round blade cutter is A piston moving processing device was devised, in which the semi-finished piston with the sprue removed was pushed out by another horizontal air cylinder and dropped onto a belt conveyor located below, and was introduced into a part of the piston manufacturing line. .

However, accurately positioning the piston semi-finished product on the movable support stand or the fixed support stand, although it may seem easy at first glance, is quite difficult.

The reason for this is that the shape of the piston semi-finished product is not constant, including the sprue, and the structure of the positioning support itself makes it difficult to accurately position and support the posture of the piston semi-finished product.

Therefore, the inventors of the present invention came up with the idea that positioning and feeding could be performed using the piston pin hole formed relatively accurately by the mold at the casting stage, and as a result of intensive research, they completed the present invention.

[Object of the Invention] An object of the present invention is to provide a piston movement processing method and a device therefor that can feed a piston semi-finished product to a processing section in an accurately positioned state without a special positioning device. It is in.

[Structure of the Invention] The present invention is characterized in that the reciprocating shaft of the piston semi-finished product as a piston is arranged almost horizontally, and the piston semi-finished product is moved along the reciprocating shaft to be fed to the processing section. A method for moving a piston, or a moving method for moving a piston as described above, in which a large number of moving blocks each consisting of a V-shaped abutment and a truncated cone standing upright almost vertically from the bottom of the V-shaped abutment are connected in series. A method in which semifinished pistons are fed on the entry side on a movable conveyor so that the truncated cone of each moving block is fitted into the piston pin hole, and the semifinished pistons are fed to the processing section in that position. (Invention 1) and a continuously movable piston semi-finished product which is held endlessly by connecting a number of movable blocks in series, each consisting of a V-shaped abutment and a truncated cone standing upright almost vertically from the bottom of the V-shaped abutment. There is provided a piston movement processing device f (invention 2) characterized by comprising a conveyor for supplying pistons and a processing section disposed orthogonally to the conveyor.

The present invention 1 will be described below using examples. 2 will be explained in detail.

[Example] Fig. 1, Fig. 2, Fig. 3, and Fig. 4 are an overall perspective view, an enlarged perspective view of a processed part, a side view of a moving part, and an IV-mV' in Fig. 3, respectively, of an embodiment of the present invention. FIG.

In FIG. 1, 100 is a moving part (conveyor), 200
300 is a processing section (band saw drive device) orthogonal to the moving section, and 300 is a conveyor for discharging semi-finished pistons that have been cut using a hot water bath.The conveyors 100 and 300 are synchronously driven by one motor 250 via a roller chain 251. .

1 to 4, the conveyor 100 is provided with a sprocket shaft 43 and a driven wheel shaft 44 whose position can be adjusted by a screw shaft 46, and a roller chain 40 is mounted between the sprocket 42 and the driven wheel 45. The roller chain 40 is fixed to the base plate 29 via a bracket part 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 rail 95 is installed on the lower side to prevent the roller chain loop from hanging down.
The movable block 30 is supported by 95.

A moving block 30 is fixed on the substrate 29 by elongated holes and bolt nuts so as to be adjustable in the width direction. Therefore, although the distance between the piston with sprue and the band saw 32 can be adjusted individually, the overall adjustment can be easily performed using a screw shaft driven by the handle 210 shown in FIG.

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

In other words, basically, a V-shaped support is formed so that the reciprocating axis of the piston semi-finished piston of different sizes is precisely along the conveyor moving direction, and the V-shaped support stands almost vertically upright from the bottom of the V-shaped support. A truncated cone is provided.

Here, the angle θ between the V-shaped support and the horizontal is 30°≦θ≦6
0°, preferably between 42'' and 47°. The Taber angle of the truncated cone is between 0.5° and 5°, and in this example is about 3
°.

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

In addition, in the uncast state, the piston pin hole is tapered with a slightly larger entrance diameter on both sides to facilitate removal from the mold. However, this piston pin hole will be 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 with the V-shaped support 30B having an approximately tangential slope. .

Incidentally, if the truncated cone 30A is screwed into the moving block 30, it is possible to replace the truncated cone and the height and size can be easily adjusted. The ■-shaped abutment can also be made removable in the same way.

Also, in Figure 4, the movable block is offset to the right (band saw side) in the width direction, so especially when cutting the sprue, the band saw moves downward at high speed, and the friction force is added, causing the movable block to move to the right. The left end 30C of the movable block may tend to rise due to the inclination, resulting in inaccurate positioning of the piston semi-finished product.In order to prevent this lifting, the left end 30C of the movable block may be supported by pressure from above with a roller 55.

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

In addition, a pair of sleds 50.degree. 50 for elastically pressing down the piston semi-finished product 1 can be arranged above the moving block 30 if necessary.

1) 50.50 are four coil springs 51.5 arranged on a support table 52 that can be raised and lowered by a screw shaft 110 of a lift table 111 fixed to the outer wall of the conveyor 100.
1, 51. In the state of being pressed downward by 51,
The upper part of the piston semi-finished product loaded on the moving block 30 is slidably held.

By doing so, it becomes possible to position the piston semi-finished product even more accurately during the cutting process.

Also, during the cutting process, the gilt bronze 32 accurately supported by rollers 33 and 33 descends at a high speed of 300 to 500 m/min to cut the sprue, but at this time, a large amount of emulsion coolant is used like a round blade cutter. There is no need to flow down,
Dripping a small amount of waste hydraulic oil is sufficient.

In addition, cutting processing means include a water knife using a guillotine shear ultra-high pressure water jet, TIG jet (plasma jet), laser beam, electron beam (in vacuum),
It is also possible to adopt electrical discharge machining (in a medium), etc.

Furthermore, it is of course possible to use a roller array, linear bearing, crawler, etc. instead of the sled 50.50.

[Effects of the Invention] By implementing the present invention 1.2, all of the above objects can be achieved.

That is, it is possible to feed the piston semi-finished product to the processing section in an accurately positioned state without a special positioning device.

Furthermore, compared to conventional means, there are fewer defects on the product, and the operating rate of the line itself is significantly improved.

Also, one type of moving block can handle piston semi-finished products of different sizes.

[Brief explanation of drawings]

1, 2, 3, and 4 are an overall perspective view of an embodiment of the present invention, an enlarged perspective view of a processed part, a side view of a moving part, and a third
5 is a sectional view taken along the line mV-mV' in the figure, and FIG. 5 is an overall perspective view of the conventional device. 100 moving section, 200 processing section, 300 discharge conveyor, 1 piston semi-finished product, IA sprue, 29 substrate, 30 moving block, 30A truncated cone, 30B V-shaped support, 32 band saw, 40 roller chain, 50 sled.

Claims (5)

[Claims] (1) A piston movement processing method characterized in that a reciprocating shaft of a piston semi-finished product as a piston is arranged substantially horizontally, and the piston semi-finished product is moved along the reciprocating shaft and fed to a processing section. . (2) On a continuously movable conveyor in which a large number of movable blocks each consisting of a V-shaped abutment and a truncated cone standing almost vertically upright from the bottom of the V-shaped abutment are connected in series, each movable block has a truncated cone. Claim 1, characterized in that the piston semi-finished product is fed from the entry side so as to be fitted into the piston pin hole, and the piston semi-finished product is fed to the processing section in that position. Piston movement processing method. (3) The piston movement processing method according to claims 1 and 2, wherein the piston semi-finished product is a piston with a sprue, and the processing section is a sprue cutting device. (4) A large number of movable blocks consisting of a V-shaped support and a truncated cone standing upright almost vertically from the bottom of the V-shaped support are connected in series to supply a semi-finished piston that is held endlessly and can be moved continuously. A piston movement processing device comprising: a conveyor for moving the piston; and a processing section disposed orthogonally to the conveyor. (5) The piston movement processing device according to claim 4, wherein the piston semi-finished product is a piston with a sprue, and the processing section is a sprue cutting device.