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US 2003/0197047 A1Published application
Friction welding apparatus
AssigneeNone recorded
InventorsTatsuo Kanzaki, Masanori Kanda, Takaaki Kumagai
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AssigneeNone recorded
InventorsTatsuo Kanzaki, Masanori Kanda, Takaaki Kumagai
Estimating the term…
Two workpieces are frictionally welded by a friction welding apparatus which comprises a fixing holder and a rotary holder. One of the workpieces are held by a fixing chuck provided on the fixing holder, while the other is held by a rotary chuck provided on the rotary holder. Pressing portions are formed on opposing surfaces of the chucks. When the work pieces are pressed by the holders and welded to each other with friction heat, burrs generated around a bound portion of the workpieces are prevented by the pressing portions from expanding axially of the workpieces
A friction welding apparatus comprising:
Dependencies are inferred from the claim text.
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Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating: the heat being…
The heat being generated by friction; Friction welding: using translation movement
Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass: for…
Soldering or unsoldering
Term end not estimated
The present invention relates to a friction welding apparatus for welding between different materials such as stems of a poppet valve.
In poppet valves which are used in an internal combustion engine, a valve head is made of austenite heat-resistant steel, and a valve stem is made of martensite heat-resistant steel. They are welded to each other.
Stems of such a valve are welded to each other using friction welding apparatus as shown in FIG. 9. The friction welding apparatus “A” comprises a rotary holder 2 fixed on a base 1, and a fixing holder 3 which moves from side to side reciprocally on the base 1 by a hydraulic cylinder (not shown). A collet-type rotary chuck 2a and a fixing chuck 3a are mounted on opposing surfaces of the holders 2 and 3 respectively.
The features and advantages of the present invention will become more apparent from the following description with respect to embodiments as shown in appended drawings wherein:
FIG. 1 is a horizontal sectional plan view of the first embodiment of a friction welding apparatus according to the present invention before welding of workpieces;
FIG. 2 is a horizontal sectional plan view when the workpieces are welded;
FIGS. 1 and 2 illustrate the first embodiment of the present invention. A friction welding apparatus 10 comprises a rotary holder 2 and a fixing holder 3 which have a rotary chuck 2a and a fixing chuck 3a respectively. Annular pressing portions 11,11 having axial bores 11a,11a are provided on the rotary and fixing chucks 2a,3a to expand and shrink radially together with the chucks 2a,3a. The annular pressing portions 11,11 are separable into a number of divisions circumferentially.
To bind a stem material 4 with a head material 5 of a poppet valve using the friction welding apparatus 10, as shown in FIG. 1, the materials 4,5 are held between the rotary and fixing chucks 2a and 3a so that the opposing ends may project from pressing surfaces 11b,11b of the blocks 11,11. The materials 4,5 are slightly longer than what are welded to form burrs during welding.
Then, as shown in FIG. 2, while the rotary chuck 3 is rotated at high speed, the fixing holder 3 is moved rightward, so that the axial end of the head material 5 is engaged on the axial end of the stem material 4 and pressed at suitable pressure.