MXPA00006358A - Milling cutter and insert therefor - Google Patents

Abstract

A fully indexable negative geometry polygonal insert uses an active cutting edge extending in a first direction from each corner of the polygon downwardly from an associated major polygonal surface of the insert along with a wiping or finishing cutting edge lying substantially in the plane of the associated major surface and extending in a second direction from the insert corner. The geometry of the cutting edge enables mounting of the insert to a milling cutter with negative axial rake, such that the cutting edge is substantially parallel to an axis of rotation of the cutting tool.

Description

STRAWBERRY AND INSERTION ACCESSORY FOR THE SAME BACKGROUND OF THE INVENTION The invention relates generally to spacing cut insert fittings and associated material removal tools. More specifically, the invention relates to spaced polygonal insert fittings for face milling or shallow piercing of square or perpendicular shoulders in the material of the workpiece.

Traditionally, to mill a square, or 90 ° angle, the cutting tool used either employs a helical cutting edge or a neutral linear cutting edge, i.e., an edge having an axial inclination of zero. However, the approach of the neutral cutting edge has presented problems of incidence angle in the past with other portions of the cutting insert used with the tool.

Therefore, it is noted that it is a need in the art for the cutting tool to provide a spacing fit accessory, adaptable for mounting to a cutting tool, such as a face mill or a bar. Ref. 0120650 , which can be oriented to produce an active cutting edge having an axial inclination of zero, still capable of providing protection to a rear cutting edge of the insert.

BRIEF DESCRIPTION OF THE INVENTION Accordingly, in one aspect of the invention, a spacing cutting insert comprises a polygonal body having substantially parallel surfaces substantially joined by perpendicular peripheral side surfaces substantially to the larger surfaces to form angles of the polygon, a leading cutting edge that it extends in a first direction from each angle in a downward direction relative to a larger surface associated with the angle, and a rubbing edge spaced from the angle in a second direction and that is substantially in the plane of the largest surface.

In another aspect of the invention, a rotating material removal tool has at least one negative geometry insert attached thereto to form a shoulder in a workpiece, since the tool is rotated, each insert is placed in a cavity of the tool to provide a negative axial and negative radial inclination, but with an active cutting edge of each insert that extends in a first direction from an angle of the insert insert substantially parallel to an axis of rotation of the tool and with a rubbing edge extending in a second direction away from the angle of the insert, thereby forming a shoulder of 90 ° substantially on a work piece subjected to the cutting action of the rotating tool.

BRIEF DESCRIPTION OF THE DRAWING The objects and features of the invention will become apparent in view of a detailed description of a preferred embodiment, taken in conjunction with the drawing, in which: Figure 1 is a perspective view of a negative insertion accessory fully spaced according to the principles of the invention; Figure 2 is a perspective view of a facing bur that mounts at least one of the insertion fittings of Figure 1 thereto; Figure 3 is a side view of the body of the cutter 200 of Figure 2; Figure 4 is a final view of the cutter 200 of Figure 2; Figure 5a is another final view of the cutter 200 showing the negative radial inclination; Y Figure 5b is another side view of the cutter 200 showing the negative axial inclination.

DETAILED DESCRIPTION With reference to Figure 1, the insert 100 has a "negative" shape, ie, active cutting edges around its periphery on both the larger surfaces, due to the fact that the side surfaces are substantially perpendicular to both sides. larger surfaces. A main advantage of the negative insertion accessories is that they provide twice as many spatial cutting edges as is provided by the insertion fittings on one side or positively.

Each main cutting edge of the insert 100, 102a-d associated with the larger surface 108 and 102e-h (the edges 102f, g, and h are not visible in the view of Figure 1) extends from an associated angle of the insertion fitting in a direction which follows its downward course from the associated major surface, such as 108.

When mounted to a face mill according to the principles of the invention discussed below, each active cutting edge such as 102a will provide a cutting depth as shown at 114 in Figure 1. Each cutting edge 102a -h shows a positive shape (i.e., the upper surface behind each cutting edge forms an acute angle with the associated lateral or side surface of the insert) through the use of a groove formed by a first surface 110, which extends downwardly from the cutting edge 102a to join a deepest position of an ascending ramp surface 112, which terminates substantially in the plane of the largest surface 108.

Additionally it is associated with each main cutting edge 102a-h a respective terminal or rubbing edge 104a-h (104e, f, g and h, are not shown in Figure 1). Each rubbing edge 104a ~ h is substantially in the plane of its associated major surface. For example, the rubbing edges 104a, b, c and d are substantially in the plane of their associated major surface 108. The connection of each cutting edge 102 with its associated terminal edge 114 is a transition cutting edge 103a-h, which It basically works as a burr forming element.

The insert further comprises a second larger surface not shown in the drawing of Figure 1, but which is substantially parallel to the larger surface 108. The two larger surfaces are joined by four lateral or side surfaces 106 (only one of the side surfaces is visible in the perspective view of Figure 1). It will be understood that the side surfaces 106 are normal or substantially perpendicular to the major surfaces 108 to form a polygon, such as the square insertion fitting shown in Figure 1. It will be understood that the insert of this invention could comprise a polygon of virtually any shape. However, the square shape with the cutting edge and its associated rubbing edge extending at 90 ° angles substantially from each other from a respective angle of the insert is preferred in the formation of a 90 ° shoulder in one piece of job.

With each main cutting edge 102 extending downwardly from its associated angle as shown in Figure 1, the insert can be advantageously mounted to a cutting tool such as a rotary face mill 200 of FIG. 2 of FIG. Such that the cutting edge can be parallel to the axis of rotation of the tool, at a time when the insert is itself mounted in a cavity to show a total negative axial inclination.

The view of Figure 3 shows the principles of the negative axial total inclination, still the neutral inclination of the cutting edge 102a with respect to a rotation axis 301 of a facing cutter 200. It is seen from Figure 3 that the edge of The cut 102a is substantially parallel to the axis of rotation 301 of the cutter 200, whereby an effective neutral axial tilt cutting action is provided, while the negative axial positioning of the body of the insert provides a necessary angle of incidence between the cutter. side surface 106 and the material of the workpiece that is milled.

In addition to the negative axial inclination of the total insertion fitting in a mounting pocket of the facing cutter 200, the invention uses a negative radial inclination for the total insertion fitting as seen in the final view of Figure 4 of the cutter 200, wherein the insert 100 is mounted to the mill in a manner that exhibits a negative radial inclination (ie, where the active cutting edge is in front of the center) as shown in the angle 401 of Figure 4.

While the body of the total insert is thus mounted in a recess in the cutter body with negative axial and radial tilt angles to provide an angle of incidence, it is a feature of this invention that the radial tilt angle of the Current effective cutting edge can be negative, neutral or positive. The choice of the geometry of radial inclination of the cutting edge depends on the amount of force of the required cutting edge, which, in turn, is a function of the type of material that is milled.

It will be understood by those skilled in the art that the insert 100 of the invention can also be advantageously mounted on a shallow drill bar, as well as on the face mill of Figures 2-5.

Figure 5a is another final view of the cutter 200 showing a negative radial inclination angle 501 and the resulting dead angle 503, which will protect the trailing edge of the insert, since the tool rotates through the material of the part of work.

Finally, Figure 5b is another side view of the cutter 200 describing the negative axial inclination 505 and the resulting dead angle 503 provided by this mounting arrangement.

Therefore, using the principles of the invention, a negative insertion fitting (having cutting edges formed on both sides thereof to provide maximum spacing) is inclined in the body of the milling cutter, such that a high point in the Insertion fitting extends beyond the rest of the insert that creates an angle of incidence or protection for the trailing edge of each insert 100.

Additionally, the high point of the insert is formed to create a rubbing edge associated with a major cutting edge to produce a good part finish and, in the case of a polygonal insert attachment having 90 ° angles substantially finished an ideal 90 ° shoulder on a work piece.

The design takes into account an insertion fitting that is double-sided with an immovable rubbing edge and will produce a square flange on the finished part, while protecting the rear cutting edge of the insertion fittings used.

The invention also allows the cavities of the insert attachment to be milled more easily in the body of the cutter in relation to the composition angles. The upper form of the cutting edges with the internally associated depressions of each edge allows the cutting geometry to be neutral or positive.

The invention has been described with reference to a preferred embodiment for the example reason only. The scope and spirit of the invention are determined from an adequate interpretation of the amended claims.

It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it relates.

Having described the invention as above, the content of the following is claimed as property.

Claims (7)

1. A spacing cutting insert, characterized in that it comprises a polygonal body having substantially larger parallel surfaces substantially joined by perpendicular peripheral lateral surfaces substantially to the larger surfaces to form angles of the polygon, a main cutting edge extending in a first direction from each angle in a downward direction relative to a larger surface associated with an angle, and a rubbing edge spaced from the angle in a second direction which is directed away from the angle and which is substantially in the plane of the main surface.

2. The insertion assortment according to claim 1, sarasterized because the main end edge rotates along a groove in the larger surface, thereby providing a positive inclination cut shape.

3. The assession of soundness insertion to claim 2, characterized in that the groove is formed by a first surface extending from the active edge edge downwardly from the greater surface and ending in a second surface, which extends upwardly and internally to finish on the larger surface.

4. The cutting insert according to claim 1, characterized in that it is adapted to be mounted in a cavity of the rotary cutting tool having a negative radial and negative axial inclination which results in the main cutting edge rotating substantially parallel to an axis of rotation of the cutting tool, such that a shoulder of 90 ° in a workpiece can be formed by the tool sorte.

5. The insertion assesorio according to claim 1, characterized in that it also comprises a transition cutting edge at each angle of the polygonal body that couples each main cutting edge to its associated rubbing edge.

6. A rotating material removal tool, characterized in that it has at least one negative geometry insertion fitting mounted thereon to form a shoulder in a workpiece, since the tool is rotated, each insertion pad is soldered in a savity of the tool to provide a negative axial and negative radial inslination, but are an active cutting edge of each insertion fitting extending in a first direction from an associated angle of the insert insert substantially parallel to a tool rotation axis and with a rubbing edge extending in a second direction away from the angle of the insert, whereby a 90 ° shoulder is substantially formed in a work piece subjected to the action of the rotating tool.

7. A rotating material elimination tool, characterized in that it has at least one negative geometry insert accessory mounted thereto to form a shoulder in a workpiece, since the tool is rotated, each insertion pad is soldered to provide a Negative radial and negative axial inslinasion of the insertion assesorium are respected to the tool, they are the same as an angle of incidence between an exposed suspending surface of the insertion fitting and a work piece, the insertion pad presents an edge With an astive bearing extending substantially parallel to a rotational axis of the tool, the active cutting edge shows any one of a preselessioned angle of positive, neutral or negative radial inslinasion.