Metal founding – With positive cleaning means for apparatus
Patent
1988-11-30
1990-02-06
Husar, Stephen F.
Metal founding
With positive cleaning means for apparatus
164347, 184 6, B29C 3344
Patent
active
048982253
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION:
This invention relates to a mold lubricant exhausting apparatus for a knocking-out mechanism installed in a press machine, etc.
BACKGROUND ART
A press machine for executing a molding work, such as a drawing work or a mold forging, generally has a knocking-out mechanism to separate a mold from a molded product. The knocking-out mechanism has a knock-out bar in openings formed at a bed and a bolster, and the knock-out bar is vertically moved by means of a linkage of a cam and a lever interlocked to a slide to push out the molded product from the mold.
In a warm forging work by a press machine, a material is worked while diffusing mold lubricant to the mold and the material during the work. The mold lubricant is, for example, a mixture of graphite and water mixed at a predetermined ratio, and to cool the mold and the material during molding and to lubricate a contact portion between the mold and the material.
When the mold lubricant is used during a molding work in the press machine having the knocking-out mechanism as described above, the mold lubricant overflows from the mold and the material through openings defined at the bed and the bolster along the knock-out bar, and is accumulated in the bed. In a conventional exhausting apparatus, a reserving chamber having an exhaust port is provided around the knock-out bar in the bed to temporarily gather the overflowed mold lubricant therein and then exhaust the mold lubricant through the exhaust port.
However, in the exhausting apparatus of a type described above, the graphite in the mold lubricant cannot be completely exhausted but remains in the reserving chamber which is accumulated on the bottom of the reserving chamber. Thus, there is a possibility that the remaining graphite might disturb the exhaust of the mold lubricant from the exhaust port. In such a case, the knock-out bar is dipped in the mold lubricant in the reserving chamber so that the graphite fixes the knock-out bar and members of the bed which otherwise relatively move with respect to one another. When the knockout bar is operated in this state, it might damage the knocking-out mechanism.
SUMMARY OF THE INVENTION
Accordingly, an object of this invention is to provide a mold lubricant exhausting apparatus for a knocking-out mechanism of a press in which all of the above-described difficulties accompanying conventional apparatus have been eliminated, and which can prevent the knocking-out mechanism from being damaged due to the seizure of a reserving chamber and a knock-out bar by mold lubricant.
According to the invention, there is provided a mold lubricant exhausting apparatus for a knocking-out mechanism comprising a nozzle disposed at an end thereof in a reserving chamber, and an air pump connected to a base end of the nozzle for supplying air to the nozzle for forcibly exhausting mold lubricant from the reserving chamber. With this construction, the mold lubricant is prevented from being accumulated in the reserving chamber thereby to eliminate the seizure of the knock-out bar and members of a bed by the mold lubricant and to prevent the knocking-out mechanism from being damaged.
BRIEF DESCRIPTION OF THE DRAWINGS:
In the accompanying drawings:
FIG. 1 is a sectional view schematically showing one preferred embodiment of the mold lubricant exhausting apparatus for a knocking-out mechanism according to the present invention; and
FIG. 2 is a schematic side view of a press machine employing the mold lubricant exhausting apparatus for the knocking-out mechanism.
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail with reference to the accompanying drawings.
FIG. 2 schematically showing a press machine employing the mold lubricant exhausting apparatus for a knocking-out mechanism according to the present invention. The press machine has a reserving chamber 2 in a bed 1. The reserving chamber 2 is defined, as shown in FIG. 1, by a ceiling plate 1a of the bed 1, a holder 1c laterally installed between the ceiling plate 1a
REFERENCES:
patent: 3538815 (1970-11-01), Clarke et al.
patent: 3963209 (1976-06-01), Muller
Hayes Christopher
Husar Stephen F.
Kabushiki Kaisha Komatsu Seisakusho
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