JPS6253310B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a processing method and apparatus for simultaneously stack honing pin holes of a large number of connecting rods arranged side by side with high precision.

Conventionally, the processing method for stack honing the pin holes of connecting rods involves arranging a large number of connecting rods side by side so that they can move individually, and stack honing the pin holes of one of the connecting rods all at once using a honing tool. It was hot. Also,
The stack honing device for carrying out this processing method consists of a number of processing chambers formed by partitioning a rectangular box into a ladder shape using partition plates, in which conrods are individually fitted in a freely movable manner. A device was used for stack honing a number of connecting rods fitted in a processing chamber using a honing tool.

However, in the honing of connecting rods using the conventional processing method and equipment described above, it is not possible to highly accurately correct variations in the pitch, parallelism, and torsion of the two pin holes at both ends of the connecting rod. It was difficult to get used to it. For example, material: Fc25, hole pitch: 37mm,
When honing a pin hole in a connecting rod with an inner diameter of 19 mm and a hole length of 13 mm using the conventional machining procedure described above with a machining allowance of 30 φμ, there will be variations in the pitch of the pin hole (maximum 25 μ) and deviations in parallelism and twist (maximum). 50μ/50mm), it was almost impossible to correct any of them, and there was a problem in that machining errors from the previous machining due to precision boring remained as they were.

The present invention aims to solve the problems of the conventional connecting rod processing method and apparatus, and to provide a processing method and apparatus for stack honing a large number of connecting rod pin holes efficiently and with high precision.

Embodiments of the present invention will be described below with reference to the drawings.

First, the method of machining a connecting rod according to the present invention involves arranging the pin holes of one of a number of connecting rods on a pilot bar and fitting them precisely, and then tilting the pin holes of the other connecting rod in the vertical direction with respect to the pilot bar while lying on its side. After placing it on a swingable support and stopping both ends of the pilot bar, use a honing tool that allows the other pin hole of each conrod to float while the conrod is still fitted to the pilot bar. Therefore, they are stack honed all at once.

A stack honing device for carrying out the above-mentioned method of processing a connecting rod according to the present invention is shown in FIGS. 1 to 3. Reference numeral 1 denotes an indexing rotary table rotatably supported on a table support base 2. On this indexing rotary table 1, there are two sets supporting a large number of connecting rods 3 arranged horizontally so as to sandwich a predetermined diameter line M between them. A cooking stove support stand 4 is installed. That is, both support stands 4 are connected to the rotary table 1.
With respect to a predetermined diameter line M, the axis _N1 of the pin hole 5a of the annular piston pin fitting part 5 at the tip of the connecting rod 3 and the annular crank pin fitting part 6 at the base end.
A large number of connecting rods 3 are individually supported on the outer periphery of both ends of the pilot bar 7 fitted through the pin holes 5a so that the axis lines _N2 of the pin holes 6a are parallel and the connecting rods are supported in a sideways state. Front and rear V-shaped support members 8, 8 and a flat support member 9 that supports the crank pin fitting portion 6 of the connecting rod 3.
It is structured according to the following. Further, the V-shaped groove 8a of the V-shaped support member 8 and the flat surface 9 of the flat support member 9
The height of a is such that the center A of the pin hole 5a at the tip of the connecting rod 3 supported by the V-shaped groove 8a and the flat surface 9a and the center B of the pin hole 6a at the base end are on the same horizontal plane. It is set so that it is located. Further, the outer diameter of the pilot bar 7 is about 5μ smaller than the inner diameter of the pin hole 5a of the piston pin fitting part 5, and the pilot bar 7 and the pin hole 5a are
A fitting precision with almost no play is provided between the two.

Reference numeral 10 serves as a connecting rod regulating member which is removably fitted into a part of the connecting rod support base 4 slightly above the front and back of the flat support member 9, and restricts movement of the axis of the pin hole 6a of the connecting rod 3 in the same direction. Thrust rings, front and rear thrust rings 10,
The crank pin fitting portions 6 of a large number of connecting rods 3 fitted between the thrust rings 10, 10 and the thrust rings 10, 10
A gap c of approximately 0.2 mm is provided between the two. Further, the thrust rings 10, 10 have an introduction hole 12 into which the honing tool 11 is introduced.
is drilled there.

Reference numeral 13 denotes a restraining piece for controlling the outer periphery of both ends of the pilot bar 7 supported on the V-shaped support members 8, 8 downward with respect to each V-shaped groove 8a.
is raised and lowered by a pressure cylinder 14 for raising and lowering the restraining piece, which is installed near the index rotary table 1. That is, the above-mentioned restraining piece 13 prevents the pilot bar 7 on the V-shaped support members 8, 8 which are indexed and rotated from a predetermined diameter line M of the indexing rotary table 1 to the side of the machining position where the honing tool 11 is disposed. This restraining piece 13 is used to restrain the outer periphery of both ends, and this restraining piece 13 is attached to a pressurizing cylinder 14 for lifting and lowering the restraining piece, which is pivotally connected by a pin 16 to a mounting base 15 near the index rotary table on the side of the honing processing position.
A piston rod 17 of the pressurizing cylinder 14, a first balance 20 connected to the upper end of the piston rod 17 by a pin 18 and pivotably mounted to the mounting base 15 by another pin 19; 1
It is connected to a part of the balance 20 via a second balance 22 etc. which is pivotably mounted by a pin 21.

Reference numeral 23 denotes an index rotation drive device which is installed in the center of the table support base 2 and rotates the index rotation table 1 in 180 degree increments.
Reference numeral 3 uses a rotation drive shaft or the like equipped with a well-known index rotation mechanism (not shown), and the index rotation table 1 is attached to the upper end of this rotation drive shaft.

Although the pressure cylinder 14 for lifting and lowering the restraining piece is operated by pressure oil, compressed air may be used as the pressure oil.

Since the stack honing device of the present invention is constructed as described above, the conrod 3 is now mounted on the indexing rotary table 1 shown in FIGS. 1 to 3.
To hone the pin hole 6a of the crank pin fitting part 6 of When a large number of honed conrods 3 are supported by the V-shaped support member 8 and the flat support member 9, each honed conrod 3 is removed together with the pilot bar 7, and then A large number of new conrods 3 fitted to other pilot bars 7 are supported in the place where they were removed.

Next, on the left side of the diameter line M, the stopper piece 13
is raised and retracted from the outer periphery of both ends of the pilot bar 7 by the pressure cylinder 14 for lifting and lowering the restraining piece, the indexing rotary table 1 is indexed and rotated, and a new connecting rod support is installed at the connecting rod replacement position. 4 Each stove supported on 3
and each conrod 3 on the honed conrod support stand 4 at the honing position.
and each processed conrod 3 that has been moved to the conrod replacement position is replaced with a new conrod 3 according to the conrod replacement procedure described above. On the other hand, a large number of new connecting rods 3 that have been moved to the honing position are moved by the restraining pieces that are lowered by the pressure cylinder 14 for lifting and lowering the restricting pieces, which are attached to the outer periphery of both ends of the pilot bar 7 into which the connecting rods 3 are fitted. 13 to press against the V-shaped groove 8a of the V-shaped support member 8, and stabilize the new connecting rods 3 on the connecting rod support base 4 at the honing position.

Thus, the pin holes 6a of each crank pin fitting portion 6 of a large number of new connecting rods 3 supported on the flat support member 9 at the honing position are
Stack honing is carried out all at once using a floating honing tool 11 introduced from the introduction hole 12 of one thrust ring 10.

In addition, the stack honing device shown in FIG. 4 is a modification of the stack honing device shown in FIGS. 1 to 3, and the device shown in FIG. V-shaped support members 8, 8 are installed on both sides of the mold support member 9, and pilots fitted with the pin holes 5a of the piston pin fitting portions 5 of a large number of connecting rods 3 are installed in the V-shaped support members 8, 8 on both sides. Each of the connecting rods 3 on both sides supports a bar 7, and the connecting rods 3 on both sides have their crank pin fitting portions 6.
are alternately adjacent to each other in the axial direction of the pin holes 6a and supported on the flat support member 9, and furthermore, the outer peripheries of both ends of the pilot bars 7, 7 on both sides into which the connecting rods 3 are fitted are as follows: The second balance 22, which is pivotally attached to the first balance 20, is restrained by respective restraining pieces 13a of a third balance 25, which is pivotably pivotally attached to both front and rear ends of the second balance 22 by a pin 24. Therefore, in the stack honing device shown in FIG.
It is supported on V-shaped support members 8, 8 on both sides of the crankshaft via two pilot bars 7, 7, and the pin hole 6a of the crank pin fitting portion 6 on the flat support member 9 is stack honed. Therefore, the load applied to the two pilot bars 7, 7 during honing is not only halved compared to the one shown in Figures 1 to 3, but also the deflection of the central portion of the pilot bar 7 is significantly reduced. This makes it possible to improve the machining accuracy of the connecting rod 3, and in addition, an oil groove or the like is locally cut at a predetermined position of the pin hole 6a of the crank pin fitting portion 6 supported by the flat support member 9. When stack honing is performed on a product that has been honed, the oil grooves are balanced left and right to minimize the deterioration in honing accuracy.

As described above, according to the present invention, a large number of connecting rods are precisely fitted with one pin hole aligned with the pilot bar, and the other pin hole of the connecting rod is vertically aligned with the pilot bar as a reference while lying on its side. The connecting rods are placed on a support stand so that they can swing, and while the connecting rods are still fitted to the pilot bars, both ends of the pilot bars are stopped and the other pin hole of each connecting rod is cut using a floating honing tool. Since the machining method is stack honing, it goes without saying that a large number of connecting rods can be honed efficiently. In particular, since the pilot bar is inserted into one pin hole and the other pin hole is machined, variations in pitch between the pin holes can be corrected with high precision.In addition, the conrod can be swung vertically with respect to the pilot bar as a support stand. Since stack honing is carried out using a honing tool that is placed on top and can float, the parallelism and twist of the pin hole can be corrected with high precision, and a pin hole with excellent cylindricity can be obtained.

Further, the stack honing device for carrying out the processing method of the present invention includes a V-shaped support member, a flat support member, and a connecting rod regulating member, which are respectively installed on both sides of a predetermined diameter line of the indexing rotary table. The pilot bar is designed to removably support a large number of connecting rods that are lined up and fitted on the pilot bar, and both ends of the pilot bar, into which the pin holes of one of the many connecting rods are fitted, are placed near the indexing rotary table. A restraining piece that is raised and lowered by an installed lifting pressure cylinder presses and restrains the V-shaped support member, and the other pin holes of the many condensing rods supported by the flat support member are made to flow. To provide a compact and easy-to-manufacture device for stack honing a cooking rod, in which stack honing is carried out using a honing tool capable of honing, so that the features of the processing method of the present invention described above can be fully expected. It is something that can be done.

[Brief explanation of the drawing]

Fig. 1 is a front view of a stack honing device showing an embodiment of the present invention, Fig. 2 is a plan view of the indexing rotary table shown in Fig. 1, and Fig. 3 is a cross section of Fig. 2 taken along the - line and the arrow What you see in the direction of the counterclockwise direction
FIG. 4 is a cutaway side view rotated by 90 degrees, and a partial front view of a stack honing device showing a modification of the present invention. 1... Index rotary table, 3... Conn rod,
5... Piston pin fitting part, 6... Crank pin fitting part, 5a, 6a... Pin hole, 7... Pilot bar, 8... V-shaped support member, 9... Flat support member, 11 ... Honing tool, 13, 13a
...Blocking piece, M...Predetermined diameter line.

Claims (1)

[Scope of Claims] 1. A number of connecting rods are precisely fitted with one pin hole lined up on a pilot bar, and the other pin hole of the connecting rod can be vertically swung with reference to the pilot bar when the rods are laid down on their side. After placing it on a support stand and stopping both ends of this pilot bar, with the connecting rod still fitted to the pilot bar, float the other pin holes using the axis of the pilot bar as a reference. A stack honing method for cooking stoves, characterized by stack honing all at once using a honing tool. 2. A pilot bar that lines up and fits one pin hole of a large number of connecting rods installed on both sides of a predetermined diameter line of the indexing rotary table, and a pilot bar that is provided on the indexing rotary table and supports the outer periphery of both ends of the pilot bar. 2 sets of V-shaped support members, and a pilot bar supported by the supporting members, and a connecting rod installed on the index rotary table in parallel with the pilot bar and fitted with the pilot bar so that the connecting rod is laid down on its side. a flat supporting member that supports the other pin hole; and a connecting rod regulating member that supports the connecting rod side portions on both sides of the group of connecting rods in a sideways state and restricts movement in the same direction as the axis of the pin hole of the connecting rod. and a restraining piece for restraining the outer periphery of both ends of the pilot bar on the V-shaped support member at the honing processing position where the honing tool is placed, which is raised and lowered by a lifting pressure cylinder installed near the index rotary table. A stack honing device for a cooking stove, comprising: