Gear cutting – milling – or planing – Broaching – Cutter infeed means
Reexamination Certificate
2002-03-08
2003-05-27
Briggs, William (Department: 3722)
Gear cutting, milling, or planing
Broaching
Cutter infeed means
C409S280000
Reexamination Certificate
active
06568890
ABSTRACT:
BACKGROUND
The invention relates to an inside broaching machine with an upper pressure carriage and a lower drawing carriage that are displaceable in a machine rack. A machine table, that receives the work pieces that are to be broached in parallel alignment, is arranged between the carriages. The broaching tools that penetrate the machine table can be locked in the pressure carriage and the drawing carriage.
A vertical broaching machine for internal broaching work is known from DE 42 35 145 A1. An upper pressure carriage that is spaced apart from a lower drawing carriage, can be displaced as a joint broaching carriage via a common drive. A stationary machine table receives work pieces that are to be mounted. It also includes tool-holding devices both on the pressure carriage and the drawing carriage. The shafts or ends of the broaching tools (broaching needles), can be locked in the tool holders. The broaching machines are used either as pressure broaching machines or drawing broaching machines depending on whether the vertically arranged broaching tools are fixed on the pressure carriage or on the drawing carriage.
The known machines are used for working inside drilled holes or grooves. The broaching tools are pushed or drawn past the inside surfaces that are worked. The known machines are disadvantageous because the broaching tools are clamped on only one side while they are in use. In pressure broaching machines, the load limit is restricted by the buckling rigidity of the relatively elongated, spindle-like broaching tools. In drawing broaching machines, the unilateral fixing of the long broaching tool in the drawing carriage has an adverse effect wherein the other end of the tool is capable of yielding radially, resulting in the formation of inaccuracies on the surface.
This invention proposes an inside broaching machine that avoids the drawbacks of the known pressure and drawing machines and allows the broaching treatment of work pieces with high accuracy, high driving forces, and high production output rates.
SUMMARY
The invention relates to an inside broaching machine with broaching tools locked to an upper pressure carriage and a lower drawing carriage both displaceably mounted in a machine rack. The decisive advantage offered by the present invention is that pressure and tensile force are applied to the broaching tools at the same time while the broaching tool is clamped on both sides. The broaching tools are precisely guided in this connection as the broaching work is being performed. The buckling stress acting on the tools is reduced by applying pressure and tensile force simultaneously, wherein these machines are capable of operating with high working accuracy and capable of maintaining a long useful life.
Vices with radially clamping jaws are preferably used as tool holders, whereby the broaching tools are additionally supported in the upper tool holder in the axial direction.
Additional features provide for detachable, force-locked coupling of the pressure carriage with the drawing shafts, which also permits the removal of the broaching tool after the broaching work has been completed.
The associated machine table may be arranged in the machine rack either in a stationary manner or mounted in the machine rack so that it can be displaced against the direction in which the pressure carriage is working. The relative displaceability of the machine table permits a reduction of the height of the overall construction of the machine, especially of a vertical inside broaching machine.
REFERENCES:
patent: 3103852 (1963-09-01), Bonnafe
patent: 3180231 (1965-04-01), Abbot, Jr.
patent: 4030402 (1977-06-01), Onsrud
patent: 4756630 (1988-07-01), Teeslink
patent: 5755539 (1998-05-01), Takeuchi et al.
patent: 6409442 (2002-06-01), Berktold et al.
patent: 42 35 145 (1994-04-01), None
patent: 0296069 (1988-12-01), None
patent: 402167617 (1990-06-01), None
patent: 2002-96217 (2002-04-01), None
Briggs William
Collard & Roe P.C.
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