JPS5859717A - Cutting method of crankshaft - Google Patents

Abstract

PURPOSE:To process web sides and pin parts of a crankshaft for a four-cylindered engine in a short time through processing action of four times in all. CONSTITUTION:A crankshaft 20 is a component of a four-cylindered engine and provided with bearing parts J1-J5, pin parts P1-P4 although there is a phase difference of 180 deg. between P1, P4 and P2, P3. The pins P1-P4 and web sides 5- 12 are cut by means of the first, and the second internal teeth milling tools 1, 2 which are facing each other and moving in the opposite directions. Rotary motion of the crankshaft 20 and feeding motion of the tools 1, 2 are driven synchronously by means of NC device. The work for each web side and pin part is completed through four times similar processing action.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a method for cutting a side surface of a web and a pin portion.

In the conventional cutting method of this type, rest devices α,
The bearing part of crankshaft b is α'.

of. Web side surface C and pin part P in fully supported state.

-Ak Cutting is performed using tools d and d', and the cutting is performed in the order of first step (2), second step (2), and third step (3) shown in FIG. In this case, in the second step (■) or the third step (■), the bin part C, P. It is impossible to process both at the same time. This is because if the left and right tools d and d"fz are brought close together, the workpiece support devices will interfere with each other.

Therefore, the web side is processed three times during the processing process.
The pin part was machined three times, making a total of six machining steps necessary.

The present invention has been made in view of the above circumstances, and its purpose is to make it possible to cut a crankshaft in a total of four machining operations, which is shorter than the conventional crankshaft cutting method. It is an object of the present invention to provide a method for cutting a crankshaft that can be processed in a short amount of time.

The present invention will be described in detail below with full reference to FIG. 2 and subsequent figures.

Reference numeral 20 in FIG. 2 denotes a crankshaft, which includes first to fifth bearing parts J1 to J6 and first to fourth pin parts P1 to P, and includes a first to fifth bearing parts J1 to J6 and first to fourth pin parts P1 to P1. 4th bin part P,,P, and 2nd and 3rd bin part P
,,P, are out of phase by 180 degrees. In other words, it is a crankshaft for a 4-cylinder engine.

Then, each pin portion P1 to p of the crankshaft 20, and the tongue tap side surface 5, 6, 7, 8°9, and each pin portion P1 to P4 of the crankshaft 20 are
10. The inner tooth No. 1. Cutting with No. 27 rice tool 1°2.

Further, the crankshaft 20 is the second crankshaft. third bearing part J,
, No. 1 in Jl. It is supported by the second rest device i\3゜4. Note that each rest device 3.4 is connected to the first. 27th
As the rice tools 1 and 2 are indexed to each processing location on the crankshaft 20, they are also indexed to the bearing portions J,...
J, or -L, is supported by I4.

Further, the rotation operation of the crankshaft 200 and the feeding operation of each milling tool 1.2 are synchronously driven by an NC device.

Incidentally, the rotation of the crankshaft 20 is achieved by rotationally driving the chucks 21 and 21' at both ends.

Therefore, the rotation of the crankshaft 20 is stopped and the second
As shown in the figure, the first. The fourth pin part P1゜P4 is facing downward and the second pin part P1゜P4 is facing downward. The third bin parts P, , P, are in the upward state, and Ml, the centers 1', 2' of the second milling tools 1, 2
coincides with the rotation center 20' of the crankshaft 20.

Then, the first and twenty-seventh rice ingredients 1.2 are placed in the first. Third
Index and position the pin parts P, , P, (arrow x, , T
') With the crankshaft 20 stopped, move the first milling tool 1 downward toward the first pin part P1 (arrow y
) to cut the entire web side surface 5, 6 of the first pin part P1, and at the same time, move the second milling tool 2 upward (arrow zo) toward the third pin part P, and then cut the entire web side surface 5, 6 of the first pin part P1. Cut the web side surface 9.10.

The amount of movement at this time is within the range of Ll1mm'.

Next, the crankshaft 20 is rotated and the first
．． The 27th rice knife 1.2 is fed in synchronization with the rotation of the crankshaft (arrow 2°zJ), and the 17th rice food tool 1 feeds the first pin portions P, e, and the 27th rice food tool 2 feeds the third bin portion. Cutting the PI. In other words, the first. Third pin part P,,P.

is the first. The internal teeth of the second milling tools 1 and 2 are always cut by planetary motion and the crankshaft 20 rotating 360 degrees. The first one at this time. The amount of movement of the 27th rice sweepers 1 and 2 is Ll +LI.

The above is the first step.

After the first step is completed, each milling tool 1.2 is retracted upwards and downwards to set the origin position at each center point.

2' coincides with the crankshaft center 20', and the second. Third bearing part J,, J,
Cancel support for.

And the first. As shown in FIG. indexing positioning (r, , z';) l to the fourth pin part 7), p, and the first pin part 7); Second rest device 3
．． 4 as the third. It is indexed and positioned and supported by the fourth bearing portions J, , I4.

The second pin portion P is rotated while the first milling tool 1 is rotated with the crankshaft 20 stopped.

At the same time, the 27th rice tool ? The web side surface 11.12 of the fourth pin part P is cut by moving it downward toward the fourth pin part P4 (arrow y1'') while rotating it completely.

The first one at this time. The travel distance of the second milling tools 1 and 2,
, L, is the end.

After the cutting is completed, the first. Feeding the 27th rice tools 1 and 2 (arrows z, z
;)l, and the second. 4th pin part p,, p,
Cut with wt-x l, No. 27 rice cutter 1°2. At this time, the amount of movement of the 1st + 27th rice tool 1.2 is,
L: It is.

The above is the second step.8 After that, the first step. The second milling tools 1, 2 each have a center pin, 2'
is retreated to the origin position that coincides with the crankshaft center 20', and then waits for machining.

As described above, each web side surface and each pin portion can be cut in two processing operations, and each web side surface and each pin portion can be cut in a total of four processing operations, and can be processed in a certain amount of time.

Also, 1st. Since the 27th rice swing tool 1.2 is movable in the vertical direction with respect to the crankshaft center 20', it supports all of the bearing parts that are separated, and always supports both the first and second bearings. Web side surface processing and pin section processing can be performed simultaneously by the 27th rice tool 1.7, and the 1. No. 27 rice ingredient 1
゜2' (il--can be effectively used and processed in a short time.

Furthermore, even if the machining part changes, there is no need to rotate and index the crankshaft 20, so there is no pin part phase error caused by the rotation index error, and machining accuracy is improved.

Oh, one milling tool 1.2'! It may be possible to move only in one direction from the r crankshaft center 20', and to move in both directions from the other crankshaft center 20'.

Furthermore, the first step and the second step may be performed in the opposite order.

The present invention is as described above, and the first to fourth pin parts P1 to P4
Each side of each web and each bottle of a crankshaft for a 4-cylinder engine equipped with can be machined in a total of 4 machining operations, and can be cut in a short time.

Further, since there is no need to perform rotational index positioning of the crankshaft 20, pin part phase errors due to rotational index positioning errors are eliminated, improving machining accuracy.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional example, Fig. 2 and subsequent figures show embodiments of the present invention, Fig. 2 is a front view of the crankshaft, and Figs. 3 and 4 are illustrations of the first and second milling cutters. Explanatory diagrams showing the positional relationship between the tool and the crankshaft, FIGS. 5 to 10 are clear diagrams of the machining operation. 20 is the crankshaft. Applicant: Co., Ltd./J Gumatsu Seisakusho Agent, Patent Attorney: Masaaki Yonehara, Patent Attorney: Tadashi Fukui 1-ν 1゛: 4J? i”-′) Figure 4 Figure 3 Figure 7

Claims (1)

[Claims] The first to fourth pin portions P1 to P are fully provided and the first to fourth pin portions P1 to P are fully provided. The fourth pin part P, ,P, and the second pin part P, ,P. In a method of cutting a crankshaft 20 for a four-cylinder engine that has a phase difference of 180 degrees from the third pin part P, , p, internal teeth that can be indexed and positioned at each pin part p along the crankshaft 20 are provided. 1st. A twenty-seventh rice cake tool 1.2 is provided, and the first rice cake tool 1.2 is provided. The 27th rice tool 1.2 has a different phase.
1st ° 3rd or 2nd. 4th pin part P,, Pl, Pl, P
4, and with the crankshaft 20 stopped, move to the 1st position. The 27th rice ingredient 1.2 is added to the first, third or second. 4th pin part p, , P, , Ps, P
, to cut the web side surfaces of the pin portions, and then, in synchronization with the rotation of the crankshaft 20, the first . The 27th rice tool 1.2 is fed to cut the pin part, and after cutting is completed, the 27th rice tool 1.2 is fed and cut. No. 27 rice ingredient 1
．． 2' (2nd, 4th or 1st, 3rd bin parts p, , p, , p, with different H phases. Index and position P, and in the same manner as above, the web side surface of the pin part and the pin part A crankshaft cutting method characterized by cutting each.