US 5,489,169 A · Vertical broaching machine

Abstract

A broaching machine for cutting keyways in a bore of a piece part. There is a stationary bed plate on which is slidably mounted a moveable vise which slides along the bed plate. The jaws of the moveable vise clamp the piece part which is to be machined. A broach holder lowers the broach through an upper fixed support which has upper broach guide means disposed therein. The broach then passes through the piece part and through a lower broach guide means positioned in the bed plate. A broach pulling unit receives the bottom of the broach and reciprocates the broach in an up and down vertical cutting operation. The broach is maintained in position and alignment by means of the upper and lower broach guide means which are disposed above and below the piece part. The upper and lower broach guide means are removable and replaceable after a predetermined amount of wear has occurred. The piece part is moved into the cutting teeth of the broach a predetermined amount to remove the material from the piece part in the keyway cutting operation. A single broach is thus capable of cutting various depth keyways by controlling the amount of movement of the vise along the bed plate.

Claims12

Dependent claims

A broaching machine for cutting keyways in a bore of a piece part comprising:

a vertically disposed broach with cutting teeth thereon;
a stationary bed plate;
a moveable vise mounted for sliding movement with respect to the stationary bed plate;
jaws on the moveable vise to hold the piece part in alignment with the broach;
drive means operatively connected to the vise for incrementally moving the piece part a controlled amount towards the cutting teeth of the broach along a singular horizontal axis;
an upper fixed support disposed above the stationary bed plate;
a broach holder disposed above the upper fixed support and moveable vertically with respect thereto;
upper broach guide means in the upper fixed support;
lower broach guide means in the bed plate in alignment with the upper broach guide means, the broach vertically aligned with both the upper broach guide means and lower broach guide means;
a broach pulling unit below the stationary bed plate and moveable vertically with respect thereto, the broach pulling unit moving the broach vertically up and down during the cutting operation;
the broach passing through the bore of the piece part, guided by the upper and lower broach guide means, with the depth of the cut of the keyway controlled by the incremental movement of the vise along the horizontal axis.

8 more elements

A vertical broaching machine for removing metal from the inside bore of a work piece comprising:

a single broach vertically disposed with respect to the bore of the work piece, the broach having a rectangular cross section, with one side having cutting teeth disposed thereon;
a stationary bed plate;
a vise mounted for sliding movement with respect to the bed plate;
drive means operatively connected to the vise for moving the vise perpendicularly with respect to the vertical axis of the broach;
upper broach guide means mounted above the stationary bed plate;
lower broach guide means mounted below the work piece, the upper and lower broach guide means vertically aligned with respect to the broach, the upper broach guide means and lower broach guide means having a guide way therein which closely and slidably receives the sides of the broach, the cutting teeth of the broach not contacting the guide means;
means on the vise to firmly hold the work piece;
a broach pulling unit below the stationary bed plate, the broach pulling unit receiving the bottom of the broach and imparting vertical movement to the broach;
the broach passing through the bore of the work piece, its lateral movement guided by the upper and lower broach guide means with the amount of metal removed from the work piece controlled by the movement of the vise into the broach as the broach moves up and down.

6 more elements

Dependencies are inferred from the claim text.

Vertical broaching machine

Life of this patent

Vertical broaching machine

Life of this patent

Abstract

Claims12