Metal fusion bonding – Process – Plural joints
Patent
1987-09-17
1988-10-04
Jordan, M.
Metal fusion bonding
Process
Plural joints
29607, 29423, B23K 3702
Patent
active
047750910
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to magnetic tooling and, more particularly, to a method of manufacturing the adapter of a multipole magnetic slab of a metal-working machine tool.
PRIOR ART
The magnetic slab as an assembly comprises a power unit accommodated inside a housing covered from above by an adapter of which the face surface is intended for supporting and retaining thereon the workpieces to be worked in the machine.
There is known a method of manufacturing the rectangular adapter of a multipole magnetic plate of a metal-working machine tool, including a rectangular panel of alternating plates made of magnetic steel and brass. The method includes assembling a stack of these plates, making transverse grooves in the surface of the stack, opposite its working surface, and subsequently sealing these grooves with molten brass. The successive stage of the process is securing to the side and end surfaces of the stack strips of magnetic steel and brass, intended for supplying the additional rigidity to the adapter and for attaching the latter to the housing of the magnetic slab (U.S. Pat. No. 2,435,737; Cl. 335-285).
Adapters manufactured in this process would not be sufficiently strong because the securing of the alternating plates together by sealing transverse grooves with molten brass would not provide for their reliable attachment over their entire surface. Local heating accompanying the operation of sealing the grooves with molten brass results in warping of the plates, the gaps thus forming being sealed only partly. Thus, to ensure additional strength, the adapters have to be provided with the said side strips and bars interconnecting these strips, with corresponding openings made through the stack to accommodate these bars. Furthermore, the performance of the known method involves considerable input of effort into the manufacture of the strips and fastening elements, the sealing of the stacks of the plates and subsequent joining of the stack of the plates with the strips.
There is further known a method of manufacturing a laminated adapter of a similar structure, carried out in an oven of a special design, equipped with a device for assembling a stack of alternating plates and compressing it in the course of soldering. The method is performed, as follows: assembling a stack of alternating plates of magnetic steel and brass, interposing leaves of silver solder foil between adjacent magnetic steel and brass plates, then heating the stack thus assembled to a temperature above the melting point of the solder, while pressing the plates to each other, to provide for complete filling with the solder of any gaps between the plates of the magnetic and non-magnetic (brass) materials. Following subsequent cooling, the adapter thus produced is removed from the oven and appropriately machined (U.S. Pat. No. 2,882,458, Cl. 317-163).
The performance of this method involves the necessity of using costly silver solder, to say nothing of its requiring special-design equipment and of the operation of assembling the stack of the plates being carried out under conditions unfavourable for the workers performing it. Moreover, an adapter thus obtained would not be sufficiently strong on account of eventual unsoldered areas, particularly, adjoining its working surface.
DISCLOSURE OF INVENTION
It is an object of the present invention to create a method of producing the adapter of a multipole magnetic slab of a metal-working machine tool, wherein the operation of soldering should be performed under conditions ensuring high strength of the adapter produced with a reduced input of labour and at lower material cost.
This object is attained in a method of manufacturing the adapter of a multipole magnetic slab of a metal-working machine tool, including the steps of assembling a stack of alternating plates of magnetic steel and of a non-magnetic material, and solder, heating the stack thus produced to a temperature sufficient for soldering, and subsequently cooling the stack and machining the surfaces of the ada
REFERENCES:
patent: 3648357 (1972-03-01), Green
patent: 3783505 (1974-01-01), Schoen
patent: 4025379 (1977-05-01), Whetstone
Atroshenko Miron G.
Bocharov Nikolai F.
Krylov Nikolai P.
Menaker Pavel S.
Puzrin Leonid G.
Institut Elektrosvarki Imeni E.O. Patona Akademii Nauk Ukrainsko
Jordan M.
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