JPH02121742A - Deburring method for forged part - Google Patents

Abstract

PURPOSE:To prevent a forged part from flexural deformation arising at a deburring time by forming a thick wall part having nearly the same thickness as the thickness in the cutting direction of the most inclined part in the burred part at another part in a forging time. CONSTITUTION:For one example of the forged part, a knuckle 1 of a vehicle has a burred part 2 on the periphery directly after it is forged. The burred part 2 is composed of flat parts 2a and inclined parts 2b, and the dimension L in the cutting direction is the maximum at an inclined part 2c having a large inclined angle near a spindle 1a. Plural thick wall parts 2d, 2d are formed at parts other than the inclined site 2c in a forging time. The thickness L' in the cutting direction of each thick wall part 2d is made nearly equal to the thickness L in the cutting direction of the inclined part 2c. When the burred part 2 is cut off by a deburring device, the cutting stroke is uniformized all over the burred part 2, finished at the same time, consequently, the flexural deformation of the knuckle 1 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for deburring various forged products.

[Conventional technology]

Conventionally, when deburring, a thick part for positioning is formed in advance on the burr part of a shaft-shaped article with burrs, and this thick part is fitted into the recess of the deburring mold to accurately remove the sleeve-shaped article. A deburring mold has been proposed that allows for positioning (
(See Japanese Patent Application Laid-Open No. 57-206545).

[Problems to be Solved by the Invention] By the way, in various forged products including shaft-shaped articles as described above, the burr has a flat part, that is, a part perpendicular to the cutting direction, and a part that is inclined with respect to the flat part. If there is a sloped portion having a slope, the cutting stroke when cutting the burr will be larger at the sloped portion than at the flat portion, even if the thickness of the burr portion itself is approximately uniform. Therefore, the cutting of the burr ends earlier on a flat part than on an inclined part, but the load from the cutting punch that continues to be applied to the flat part after cutting the flat part and until the cutting of the inclined part is finished. There was a problem in that the forged product was bent and deformed.

[Means to solve the problem]

In order to solve the above-mentioned problems, a method for deburring a forged product according to the present invention includes a deburring method in which a burr is cut and removed from a forged product after forging. A thick part having a thickness in the cutting direction that is almost the same as the thickness of the part is formed in a part other than the maximum slope part, and the burr part including the thick part is cut after forging. It is.

[For production]

As in the above method, during forging, a thick part having a thickness in the cutting direction that is approximately the same as the maximum slope part in the burr part, that is, the part with the largest thickness in the cutting direction, is provided at a part other than the maximum slope part. By doing so, the cutting stroke becomes almost uniform over the entire area of the burr, and as a result, the load applied to the burr during cutting becomes almost uniform over the entire area of the burr, so that cutting ends almost simultaneously over the entire area of the burr. Therefore, bending and deformation of the forged product is unlikely to occur during deburring.

[Example] An example of the present invention will be described below based on FIGS. 1 to 3.

As shown in FIGS. 1(a) and 1(b), a vehicle knuckle 1, which is an example of a forged product, has a burr 2 on the periphery immediately after forging.
It is equipped with The burr part 2 has a flat part 2a and an inclined part 2b.
The dimension in the cutting direction is the largest at the inclined portion 2C near the spindle 1a and having the largest angle of inclination.

When forging the knuckle 1, a plurality of thick-walled parts 2d and 2
d... is formed. The thickness L' of each thick portion 2d in the cutting direction is set to be approximately equal to the thickness L in the cutting direction of the inclined portion 2c having the maximum inclination angle. For example, values of about 11.65 mm are selected as L and L'.

Further, the width of each thick portion 2d is set in consideration of the area of the inclined portion 2b including the inclined portion 2c.

Note that the thick portion 2d is cut into the knuckle 1 when the burr portion 2 is cut.
It is preferable to provide it near the main processing area so that deformation of the main processing area can be prevented intensively.

FIGS. 2(a) and 2(b) show forging dies used for forging the knuckle 1. This forging die is configured to be able to forge two knuckles 1 at the same time, and recesses 3a and 4a corresponding to the shape of the knuckles 1 are formed in the upper die 3 and lower die 4, respectively. Furthermore, grooves 3b and 4b for forming the burr 2 are formed around the recesses 3a and 4a, and within the grooves 3b and 4b, a thick portion 2d of the burr 2 is formed.
A minute groove 3 deeper than the grooves 3b and 4b for forming
c and 4c are provided. Note that the vertical holes 3d, 3d...4d, 4d... provided in the upper mold 3 and the lower mold 4
A knock pin for releasing the forged knuckle 1 is movably fitted inside.

As shown in FIG. 3, the deburring device supports a replaceable blade 5 on which the burr part 2 of the knuckle 1 is placed, and also includes a lower holder 6 having a hole 6a in the center, and a lower holder 6 that covers almost the entire upper part of the knuckle 1. The punch 7 has a shape corresponding to the upper part of the knuckle 1 so as to be able to come into contact with it and presses the knuckle 1 downward, and an upper holder 8 that supports the punch 7.

In the above configuration, when manufacturing the knuckle 1, after forging the knuckle 1 between the upper die 3 and the lower die 4, the forged knuckle 1 is placed on a deburring device so that the burr part 2 is located above the replaceable blade 5. When the knuckle 1 is pressed downward by the punch 7, the burr 2 is cut by the replaceable blade 5, and the cut of the burr 2 causes the knuckle 1 to fall into the hole 6a. Note that when cutting the burr portion 2, the thick portion 2d is formed in the burr portion 2, so that the cutting stroke is approximately uniform over the entire area of the burr portion 2, and therefore, the load applied to the burr portion 2 is transferred to the burr portion 2. Since the cutting of the burr portion 2 is substantially uniform over the entire area and the cutting of the burr portion 2 is completed almost simultaneously over the entire area, the bending deformation of the knuckle 1 due to the cutting of the burr portion 2 is reduced.

In the above embodiment, a knuckle was used as an example of a forged product, but the present invention can also be applied to various forged products other than knuckles.

〔Effect of the invention〕

As described above, the method for deburring a forged product according to the present invention includes:
In a deburring method in which burrs are cut and removed from a forged product after forging, a thick part having a thickness in the cutting direction that is approximately the same as the thickness in the cutting direction of the maximum inclination part of the burr part is removed from a part other than the maximum inclination part during forging. This configuration is such that the burr is formed in the area and the burr including the thick portion is cut off after forging.

As a result, the thickness in the cutting direction becomes almost uniform across the entire burr area, and as a result, cutting is completed almost simultaneously across the burr area, making it difficult for the forged product to bend or deform when deburring. be effective.

[Brief explanation of drawings]

1 to 3 show embodiments of the present invention, FIG. 1(a) is a schematic plan view of a knuckle, and FIG. 1(b) is a schematic plan view of a knuckle.
is a schematic front view of the knuckle, FIG. 2(a) is a plan view of the lower die in the forging die, and FIG. 2(b) is the A-A of FIG. 2(a).
FIG. 3 is a cross-sectional view of the casting mold taken along a line, and FIG. 3 is a cross-sectional view of the deburring device. 1 is a knuckle (forged product), 2 is a burr part, 2c is an inclined part with the maximum inclination, and 2d is a thick part.

Claims (1)

[Scope of Claims] 1. In a burr removal method of cutting and removing a burr from a forged product after forging, the thickness in the cutting direction is approximately the same as the thickness in the cutting direction of the maximum slope portion of the burr during forging. A method for removing burrs from a forged product, characterized in that a thick portion is formed in a portion other than the maximum slope portion, and the burr portion including the thick portion is cut after forging.