CA2222249A1

CA2222249A1 - Parting tool holder

Info

Publication number: CA2222249A1
Application number: CA 2222249
Authority: CA
Inventors: Stefan Bazydlo
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-02-04
Filing date: 1998-02-04
Publication date: 1999-08-04

Abstract

On a lathe, it is known to have a parting tool blade which is inserted into a holder clamped to the tool post. In this invention, the parting tool holder contains specially positioned slots to allow it to bend slightly under pressure, therefore preventing the parting tool blade from breaking when too much pressure is applied by the cutting material. The holder may be constructed of several pieces, but functions as a single unit.

Description

Speci fication This invention relates to the parting tool used on lathes to separate the finished product from the excess material.
It is common on lathes to use a parting tool blade that is clamped into a solid holder.
which is then clamped onto the tool post. The parting tool blade is adjustable for shallow or deep cuts, but once adjusted, the unit is stiff. The problem with this design is that the stiffness causes vibration, and as it happens quite often, breaks the parting tool.
The depth of the cut is also very limited when compared to the width of the blade, e.g. a 3 mm wide parting tool only allows a 25 mm deep cut.
I have found that these disadvantages may be overcome by using specially positioned slots in the holder in order to make it flexible. This flexibility eliminates the vibration and dampens any excess pressure applied to the parting tool. This also lets you extend the parting tool for a much deeper cut since the blade is much less prone to breaking.
The holder must be flexible enough to prevent breaking, but must be stiff enough to cut the material.
In drawings which illustrate embodiments of the invention. Figure 1 is a top view of one embodiment including a parting tool body (body) # I . washers #2, bolts #3 and an inserted parting tool blade #4 with inserted carbide insert #5, Figure 2 is a side view of this embodiment, Figure 3 is a frontal view of this embodiment, Figure 4 is a top view of this embodiment without the parting tool blade, washers and bolts, Figure 5 is a section of the line A-A of Figure 4, Figure 6 is a left side view of this embodiment (body # 1 ), Figure 7 is a frontal view of this embodiment (body # I ), Figure 8 is a bottom view of this embodiment (body # 1 ), Figure 9 is left side view of this embodiment (body # 1 ), Figure I 0 is a section of the line B-B of Figure 9, Figure I I is a rear view of this embodiment (body # 1 ), Figure 12 is a top view of a component (washer #2) of this embodiment, Figure 13 is a side view of this component (washer #2), Figure 14 and I 5 illustrate the claims.
Figures 4 to 11 illustrate different views and sections of the embodiment (body # I ). It is constructed out of a single piece and the most important aspect is the unique shape, as illustrated by these drawings, which divides it into two main functions sections. Section K, shown in Figures 4 and S above the line A-A, is the portion which attaches to the tool post of the lathe via a clamping mechanism. Section K also contains a slot F which extends upward from the bottom of the unit. Section N in Figure 4 is where two washers #2, as shown in Figures 1, 2. 3, I 2, and 13, clamp the parting tool blades to the unit. There are two counterbore holes which keep the washers #2 in the proper position.
The washers #2 are then fastened to the unit with two regular socket head bolts #3.
Sections K and N are connected to each other in only one location, as shown by the hatched area in Figure 4. The slot F in section K of Figure 5 is what gives section N its flexibility. The height of slot F and the thickness of the material above it determine the flexibility.

Claims

1 A parting tool holder for a lathe, comprising a metal unit, a clamp for a parting tool and, perpendicular to the unit, a slot to allow flexibility.

2 A holder as defined in claim 1, in which the two functions sections are connected only by the small area of metal in front of the slot.

3 A holder as defined in claim 1 or claim 2, in which the slot extends from the bottom of the unit to a point near the top of the unit.

4 A holder as defined in claim 1, 2 or 3, in which the top of the slot is no higher than 75 mm above the level of the cutting edge, and no lower than 15 mm below the level of the cutting edge of the parting tool.
A holder as definer in claim 1, 2, 3, or 4, in which the holder is a right-handed version, or a left-handed version where a left-handed version a holder is a mirror imagine a right-handed.