JPH0685963B2 - Forging die accuracy confirmation method for spherical or spherical crown parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention, when a spherical zone or spherical crown-shaped part is forged by using a split die including a die and an ejector, the die is properly assembled without displacement. The present invention relates to a forging die accuracy confirmation method of a spherical zone or a spherical crown-shaped part for confirming whether or not there is any.

[Prior art]

When the spherical zone 1 or spherical crown-shaped component 2 as shown in FIGS. 3 and 4 is formed by forging, the forging die has a spherical forming surface 3a for forming a spherical surface portion, as shown in FIG. It comprises a die 3 and an ejector 4 having a molding surface 4a for molding a planar bottom surface, which is divided at a connecting portion between a spherical surface portion and the bottom surface.

[Problems to be Solved by the Invention]

In the above forging die, if the ejector 4 deviates from the normal position with respect to the die 3 as indicated by the chain double-dashed line in the figure due to poor accuracy or poor assembly of the die 3 and the ejector 4,
(That is, when the distance between the spherical center 3b of the spherical molding surface 3a of the die 3 and the molding surface 4a of the ejector 4 deviates from a predetermined value.) As shown in FIG. An axial protrusion 1a and a step 1b are formed at the connecting portion between the bottom surface and the bottom surface. It is possible to confirm that the ejector 4 is displaced by the axial protrusions 1a and 1b. However, burrs 1c and 1d as shown in FIG. 6 and FIG. 7 may occur at the same portion as the axial projection 1a at the connecting portion between the die 3 and the ejector 4, and the burrs 1c and 1d and the mold may be formed. Axial protrusion 1a due to misalignment
Since it is difficult to determine that the defective mounting accuracy of the ejector 4 cannot be found.

Due to poor mold accuracy, the distance L between the center 1e of the sphere and the bottom surface 1f of the product varies greatly, and it is difficult to obtain stable quality in terms of processing accuracy.

Further, since it is necessary to forge in consideration of variations in dimensional accuracy, there has been a problem that the machining allowance in the finish grinding step is increased accordingly.

An object of the present invention is to discriminate axial protrusions generated at a connecting portion between a spherical surface portion and a flat bottom surface into those caused by mold deviation and burrs, correct the mold deviation amount, and correct the forging die without positional deviation. It is to provide a method for confirming the forging die accuracy of a spherical zone or spherical crown-shaped part that can be confirmed to be assembled.

[Means for Solving the Problems]

In order to achieve the above object, the method for confirming the forging die accuracy of the spherical zone or spherical crown-shaped part of the present invention comprises the following method. That is, a step of forging a spherical zone or a spherical crown-shaped part by using a forging die in which the split portion of the die and the ejector is shifted inward in the radial direction from the connecting portion between the spherical surface of the spherical zone or the spherical crown-shaped part and the flat bottom surface. Then, check the presence or absence of steps on the bottom surface of the forged spherical zone or spherical crown-shaped part.If there are no steps, confirm that the die and ejector are properly assembled without misalignment, and check if there are steps. For example, a process of determining that the die and the ejector are misaligned with each other and correcting the misalignment by the height of the step, and a method for checking the forging die accuracy of a spherical zone or spherical crown-shaped part, which comprises:

[Action]

In the above-described method of the present invention, since the divided portion of the die and the ejector is displaced inward in the radial direction from the connecting portion between the spherical surface portion and the bottom surface, it has been difficult to make a conventional determination. It is possible to discriminate between the axial protrusion and the burr at the connecting portion between the spherical surface portion and the bottom surface due to the mold deviation. That is, the mold deviation appears as a step on the bottom surface, and the burr appears as a sharp axial projection with a sharp tip, as in the conventional case, so that the two can be reliably and easily distinguished. When there is a mold deviation, the relative position of the die and the ejector is corrected by the height of the step, so that the normal assembly state can be achieved. Thus, the forging die can be made to maintain the regular die accuracy, which can be confirmed.

〔Example〕

A preferred embodiment of the method for checking the forging die accuracy of a spherical zone or spherical crown-shaped part of the present invention will be described below.

FIG. 1 shows a forging die for carrying out the method for checking the forging accuracy of a spherical zone or spherical crown-shaped part of the present invention.

The forging die shows one that molds the spherical zone 11 shown in FIG. The forging die is composed of a die 12 and an ejector 13, which are split dies divided at a position displaced inward in the radial direction from a connecting portion between the spherical surface portion 11a and the flat bottom surface 11b of the forged product shown in FIG. The die 12 has a spherical molding surface 1 for molding the spherical surface portion 11a.
2a and an annular molding surface 12b for molding the outer peripheral portion of the bottom surface 11b. The ejector 13 has a molding surface 13a for molding a portion of the bottom surface 11b excluding the outer peripheral portion formed by the annular molding surface 12b. The die 12 has a cylindrical shape and is press-fitted into the reinforcing ring 14. The spherical molding surface 12a has a spherical center 1 on the inner circumference of the die 12.
It is formed on an annular spherical surface centered on 2d.

The ejector 13 is fitted on the inner surface of the die 12 and
The spherical molding surface 12b and the molding surface 13a of the ejector 13 can be assembled flush with each other. During forging, the ejector 13 and the die 12 are moved together. After forging, the ejector 13 is the die 12
And moved relatively to push out the product.

Since the dividing portion between the die 12 and the ejector 13 is displaced inward in the radial direction from the connecting portion between the spherical surface portion and the bottom surface, the ejector 13
The molding surface 13a is formed such that its outer diameter is smaller than the diameter of the bottom surface 11b of the spherical zone 11. On the other hand, the molding surface of the die 12 is bent from the upper and lower ends of the spherical molding surface 12a, and the ejector 13
The diameter is reduced by an amount smaller than the diameter of the bottom surface 11b, and this portion constitutes an annular molding surface 12b that is connected to the spherical molding surface 12a and molds the outer peripheral portion of the bottom surface 11b of the spherical zone 11. ing.

The connecting portion between the spherical molding surface 12a and the annular molding surface 12b is formed into a rounded shape 12c. The ejector 13 is the bottom surface 1 of the spherical zone 11.
It is made about 1 mm smaller than the diameter of 1b, and the radius 12c is finished to about 0.8 mm.

Next, a method for confirming the forging die accuracy of the spherical zone or spherical annular component of the present invention using the above die will be described.

First, the above forging die is used to forge a spherical zone or spherical annular component. The ejectors 13 and 12 are forged while the molding surface 13a and the annular molding surface 12a are flush with each other.

Next, the presence or absence of a step on the bottom surface 11b of the forged spherical zone or spherical annular body is examined. If there is no stepped portion, it is determined that the die 12 and the ejector 13 are properly assembled with no positional deviation, and it is confirmed that the die 12 and the ejector 13 are in a normally assembled state. Second on bottom 11b
If the step portions 11e and 11f are formed as shown in the figure, it is determined that the die 12 and the ejector 13 are displaced from each other, and the displacement is corrected by the height of the step portions 11e and 11f.

In this case, the stepped portions 11e and 11f due to the mold deviation and the burr can be clearly distinguished. What happens is that in the case of mold deviation, it appears as a step between the bottom surface portion 11c forged by the molding surface 13a of the ejector 13 and the bottom surface portion 11d forged by the annular molding surface 12b of the die 12, and a step is formed. Part 11e, 11f to spherical part
There is a flat portion having a width of only the spherical molding surface 12b between 11a and the protrusion, and the protrusion is not sharp, whereas the burr formed by the minute gap between the die 12 and the ejector 13 is sharp. Because there is.

In this way, the axial protrusion due to the mold deviation and the burr are clearly distinguished, and the mold deviation is corrected by the amount corresponding to the mold deviation.
The assembled state of the die 12 and the ejector 13 is properly maintained in a normal state.

Further, if the die forming surface is provided with the rounded shape 12c, for example, in the case of the step 11f, it is possible to easily see the upper and lower ends of the step 11f as a shape line when viewed from the side, so that it is more clearly confirmed. It

Although the forging of the spherical zone 11 has been described in the embodiment, the same effect can be obtained for the spherical crown-shaped part by checking the step portion formed on the bottom surface thereof.

〔The invention's effect〕

According to the present invention, the split portion of the die and the ejector is forged into the spherical zone or the spherical annular component using the forging die in which the connecting portion between the spherical surface portion and the bottom surface is displaced inward in the radial direction, and the step of the bottom surface of the forged product is obtained. If there is no step, it is confirmed that the forging die accuracy is good.If there is a step, it is judged that the assembly of the die and the ejector is out of the normal state, and the height of the step is high. Since the positional deviation is corrected by just that much, the axial projection and the burr due to the positional deviation can be clearly discriminated, and the assembling accuracy of the forging die can be confirmed with high accuracy.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a forging die for a spherical zone according to an embodiment of the present invention, FIG. 2 is a sectional view of a spherical zone formed by the apparatus of FIG. 1, and FIG. Is a front view of a spherical zone, FIG. 4 is a front view of a spherical crown-shaped part, FIG. 5 is a sectional view of a main part of a conventional spherical zone forging die, and FIG. 6 is a ball formed by the forging die of FIG. FIG. 7 is a partial sectional view of a spherical zone showing a conventional burr generation state. 11 …… spherical zone 11a …… spherical surface 11b …… bottom surface 11c …… bottom surface part formed by ejector 11d …… bottom surface part formed by annular molding surface of die 11e, 11f …… step 12 …… die 12a… … Spherical molding surface 12b …… Ring molding surface 12c …… Rear shape part 13 …… Ejector 13a …… Molding surface

Claims (1)

[Claims] 1. A spherical zone or a spherical crown-shaped component is formed by using a forging die in which a divided portion between a die and an ejector is displaced inward in a radial direction from a connecting portion between a spherical surface of a spherical zone or a spherical crown-shaped component and a flat bottom surface. Check the forging process and the presence or absence of steps on the bottom surface of the forged spherical zone or spherical crown-shaped part.If there are no steps, then confirm that the die and ejector are properly assembled without misalignment. If there is, a step of determining that the die and the ejector are misaligned with each other and correcting the misalignment by the height of the step, and a method for checking the forging die accuracy of the spherical zone or spherical crown-shaped part, which comprises: