Cutters – for shaping – Including holder having seat for inserted tool – With separate means to fasten tool to holder
Utility Patent
1998-09-10
2001-01-02
Tsai, Henry W. H. (Department: 3722)
Cutters, for shaping
Including holder having seat for inserted tool
With separate means to fasten tool to holder
C407S107000, C407S109000
Utility Patent
active
06168357
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a toolholder for chip removing machining, preferably for grooving or parting, and a method of attaching a cutting insert in a toolholder.
PRIOR ART
In U.S. Pat. No. 3,844,008 a tool of the above mentioned type is described. A clamp is activated by a screw for clamping the cutting insert in an insert pocket. Often when the screw is tightened the operator over-torques or over-tightens the screw such that the clamp undergoes a plastic deformation. The plastic deformation of the clamp leads to a less accurate clamping for the next insert to be used since the clamp has been distorted.
In Soviet Application No. A1-1720803 there is shown a tool for mounting a self-wedging insert wherein the minimum height of the insert pocket for accuracy reasons is determined by means of an adjustable threaded sleeve. In practice, an insert is inserted into an insert pocket formed between a base and a clamping arm. A fastener screw is then rotated to fix the insert in place. Then, the sleeve is rotated and caused to move upwardly through the base and into engagement with the bottom of the clamping arm. After that, the fastener screw is finally tightened. As a result, the threaded sleeve defines the position of the clamping arm so that the pocket obtains a correct height relative to a self-wedging cutting insert.
OBJECTS OF THE INVENTION
One object of the present invention is to provide a rigid tool preferably for thin holders and thin cutting inserts.
Another object of the present invention is to provide a tool in which the clamp is not distorted.
Still another object of the present invention is to provide a tool in which the clamping arm is protected from plastic deformation.
These and other objects have been achieved by a tool as defined in the appended claims with reference to the drawings.
SUMMARY OF THE INVENTION
The present invention relates to a toolholder for holding a cutting insert. The toolholder comprises a base and a clamping arm connected to the base. The base and the clamping arm form therebetween a pocket and slot. The pocket has opposing surfaces and is open at a front end thereof for receiving a cutting insert. The slot extends rearwardly from a rear end of the pocket. The clamping arm is elastically biased to a position wherein the surfaces of the pocket are spaced apart. A fastening screw is provided for displacing the clamping arm toward the base against the elastic bias for clamping a cutting insert between the surfaces of the pocket. A non-adjustable spacer of fixed height is disposed in the slot for limiting an extent of movement of the clamping arm toward the base.
The invention also pertains to a method of attaching the cutting insert to the tool holder. In the method, after the cutting insert has been inserted loosely into the pocket, the fastening screw is rotated to displace the clamping arm toward the base to create an initially tightened contact between the cutting insert and the pocket surfaces, with the clamping arm being in non-engagement with a spacer disposed in the slot to form a gap therewith. Then, the fastening screw is further rotated to finally tighten the contact and cause the clamping arm to be elastically deformed in the region of the gap, whereby the gap is closed and the spacer prevents further displacement of the clamping arm toward the base.
REFERENCES:
patent: 3060554 (1962-10-01), Kirchner
patent: 3837058 (1974-09-01), Barkley et al.
patent: 3844008 (1974-10-01), Sletten
patent: 4480950 (1984-11-01), Kraft et al.
patent: 4827995 (1989-05-01), Wilson
patent: 5035544 (1991-07-01), Ikenaga et al.
patent: 5100268 (1992-03-01), Nakayama et al.
patent: 5411354 (1995-05-01), Gustafsson
patent: 5733073 (1998-03-01), Zitzlaff et al.
patent: 6010281 (2000-01-01), Coutat et al.
patent: 1 720 803 (1992-03-01), None
Coutat Jean-Guy
Grognet Frederic
Burns Doane Swecker & Mathis L.L.P.
Seco Tools AB
Tsai Henry W. H.
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