Television – Special applications – Manufacturing
Reexamination Certificate
1998-04-06
2001-01-30
Kelley, Chris S. (Department: 2713)
Television
Special applications
Manufacturing
Reexamination Certificate
active
06181370
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a method for adjusting a stamp relative to a matrix with sinter-pressing, according to the introductory part of claim 1.
With sinter-pressing, but also with other pressing or punching the stamp must be adjusted relative to the matrix bore or matrix recess. It is desirable for a uniform as possible gap, i.e. play between the stamp and matrix. The more exact the positioning of the stamp, the more uniform is also the play between the stamp and the matrix seen over the circumference.
If between the stamp and the matrix there is for example play present with sinter-pressing, a burr even if very slight, cannot be avoided. A burr formation is not desirable with pressed parts, in particular with such pressed parts which are subsequently not coated. It is known for example to manufacture cutting plates for milling, turning and drilling tools with the sintering method. It is further also known to coat such pressed parts with a layer of hard material. If then the pressed part comprises a burr there exists the danger that the burr breaks and by way of this at important locations, specifically the cutting edges, the required hardness is not longer met. On the contrary the tool wears particularly rapidly. In order to counteract such consequences a removal of the burr is required.
It is known to allocate suitable adjusting means to the stamp in order to align this transversely to the longitudinal axis opposite the matrix. Conventionally the alignment is effected visually, where appropriate with a magnifying glass.
BRIEF SUMMARY OF THE INVENTION
It is the object of the invention to provide a method for adjusting a stamp relative to a matrix with sinter-pressing, with which a smaller and more uniform gap over the circumference may be realized.
This object is achieved by the features of patent claim 1.
The method according to the invention relates to sinter-pressing which operates with an upper stamp and a lower stamp, i.e. with which there is provided a matrix through-bore. On manufacturing the pressed parts, the lower stamp is usually located in the matrix bore whilst the upper stamp frees this bore so that powder can be introduced from above. Subsequently the upper stamp is inserted into the matrix bore with a given force and over a given distance, where appropriate with the simultaneous actuation of the lower stamp.
For adjusting or trimming such an arrangement the stamp is moved towards the matrix bore until it is in a position shortly before the immersing. The region of the stamp is illuminated and on the side of the matrix distant to the stamp an optical recorder is positioned which acquires the matrix bore. It is to be understood that for this purpose the lower stamp is withdrawn so far from the matrix that an optical recorder may be positioned below the matrix bore. With the help of the optical recorder the matrix bore is acquired and imaged on a monitor.
The diameter of the stamp is for obvious reasons minimally smaller than the diameter of the matrix bore so that the stamp may move relatively freely in this. For this reason there exists a gap between the stamp and the walling of the matrix bore, even if this gap is extremely small. Such a gap may be acquired by the optical recorder if there is sufficient brightness available. The gap is then imaged on a monitor so that the operating person, with the help of an adjusting device for the stamp known per se, may adjust this stamp to the extent that a uniform gap thickness over the circumference is obtained. Subsequently the stamp is finally fixed at its receiver, for example with the help of a suitable clamping device.
With the help of the method according to the invention a uniform gap may be adjusted with the result that on the pressed part there arises a uniform slight burr which can be more easily dealt with on flier treatment than a one-sided burr formation. The method according to the invention furthermore has the advantage that a minimal play may be realized without the danger of there being foulings with the walling of the bore of the matrix.
The device for carrying out the method provides for a lamp which illuminates the region between the stamp receiver and the matrix. According to one formation of the invention for this there is provided an annular lamp which surrounds the stamp in the measuring position. The annular lamp may with the help of suitable measures be temporarily assembled on the stamp, for example with a suitable clamping device.
On the opposite side there is arranged the optical recorder which may for example be formed by an endoscope. An endoscope has the advantage that it comprises relatively small dimensions and by way of this may be introduced in the region between the matrix and the other pressing stamp (lower stamp).
It is to be understood that the described adjusting procedure may also be repeated, for example after fastening the stamp in the receiver.
REFERENCES:
patent: 4860096 (1989-08-01), Long
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patent: 5463462 (1995-10-01), Ohnishi et al.
patent: 5465610 (1995-11-01), Loisel
patent: 5501114 (1996-03-01), Okamoto et al.
patent: 5535006 (1996-07-01), Telschow et al.
patent: 5781230 (1998-07-01), Nguyen et al.
patent: 5881357 (1999-03-01), Takemoto et al.
patent: 5935358 (1999-08-01), Yamasaki
patent: 5970310 (1999-10-01), Satoh et al.
patent: 34 25 221 C2 (1985-01-01), None
Arndt Ulrich
Hinzpeter J{umlaut over (u)}rgen
L{umlaut over (u)}neburg Peter
Mallon Stephan
Pierags Hans-Joachim
Kelley Chris S.
Vidas Arrett & Steinkraus P.A.
Vo Tung
Wilhelm Fette GmbH
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