CA1234969A - Insert arrangement for a milling tool - Google Patents
Insert arrangement for a milling toolInfo
- Publication number
- CA1234969A CA1234969A CA000464168A CA464168A CA1234969A CA 1234969 A CA1234969 A CA 1234969A CA 000464168 A CA000464168 A CA 000464168A CA 464168 A CA464168 A CA 464168A CA 1234969 A CA1234969 A CA 1234969A
- Authority
- CA
- Canada
- Prior art keywords
- inserts
- grooves
- insert
- leading
- groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Milling Processes (AREA)
Abstract
IMPROVED INSERT ARRANGEMENT FOR A MILLING TOOL
ABSTRACT OF THE DISCLOSURE
In one form of this invention, a pair of indexable cutter inserts are positioned in each pocket of a plural pocket face mill body. The inserts are positioned in leading and trailing positions with an intermediate wedge blcok to provide parallel cutting surfaces in the same direction.
ABSTRACT OF THE DISCLOSURE
In one form of this invention, a pair of indexable cutter inserts are positioned in each pocket of a plural pocket face mill body. The inserts are positioned in leading and trailing positions with an intermediate wedge blcok to provide parallel cutting surfaces in the same direction.
Description
~:3~
-l- 6~P-2085 IMPROVED INSERT AR~ANGEMENT FQR A MILLING TOOL
This invention relates to multiple indexable insert metal working tools, and more particularly to rotary and milling kinds of tools where the cir~w~fcr^~ of the tool is the limi.ting ~actor to S the number of indexable inserts that can be effectively employed.
Background of the Invention A milling cutter may take the form oE a flat faced disc or body member which has a coaxial drive means on one side, and the other side, ~ace, includes a numbe~ of indexable cut-ters and corresponding lQ grooves, pockets or slots. The cutter inserts are arranged so -that when the face of the tool is brought up against a workpiece, for example a flat surface oE a workpiece, the inserts cut out or remove an annular groovel a saucer depressiQn ancl the like large area cuts.
The area of the face or the periphery area of the disc which is adapted to contain the cutter insert is the limiting Eact to the number of inserts that can gainfully be employed co~mensurate with the design and strength of the disc member. Obviously, existing disc members simply limit the num~er of inser-t cutters by their original design, since ordinarily there are no adjustment features. In the usual design, a milling cutter face includes a plurality of generally rectangular sockets or pockets therein. A single generally rectangular cutte~ inse~t is positioned in each pocket and a wedge block is used in the pocket tQ firmly wedge the in$ert in position. ~ further hindrance to the desired use of a gr~a~r number of inserts is the increased tool chatter which occurs when a plurality of inserts engage the ~Yorkp~ece with the same frequency and amplitude. An increase in the numbe~ ~f cutter inse~ts, commensurate with diminished chatter would represent a more desirable milling kind of tool. ~
$~
6~1p-20~5 Summary of the Invention I~ has now been discovered that the number of inserts in a disc cutter may nearly be doubled by a more effective use of wedges and inserts in slightly modiEied poc~ets.
In a given plunge milling cutter having one or more circular rows of pockets to contain insert and wedges, the pockets are made slightly wider, if neces-sary~ and in each pocket there is positioned a pair of inserts with an intermediate wedge. The insert position-ing geometry is modified to minimize chatter.
Brief Description of the Drawings This invention will be better understood when taken in connection with the following description and the drawings in which: FIG. 1 is a plan view of one embodiment of this invention AS a plunge mill cutter;
and FIG. 2 is a partial and side elevational view of a double insert arrangement as used in FIG. 1.
Description of Preferred Embodiment Referring now to FIG. 1 there is illustrated a plunge mill cutter 10 comprising a heavy wheel or disc member 11 and a plurality of repeating sets of inserts 12 arranged on the work- ing face thereof. The reverse face of the cutter 10 contains the usual drive means Eor ro-tating the disc member 11 about its concentric axis.
Disc member 11 includes a series of generally rectangular slots 13 which progress from the periphery of the disc towards the center 14 but purposefully not radi-ally. The center line of each groove with the exception of groove 15 is displaced from or offset from a center line of the circle in the direction of rotation a suit-3~9 60Mr-2085 able amount to provide a proper negative radial rake.
Also, some of the peripheral angular distances between groove centerlines at the outer periphery of the disc member are equal and some are unequal. The slots 13 have been slightly enlarged in width, for example about 25~, to accommodate the insert combination as illustrated.
Each repeating insert set 12 comprises two inserts 16 and 17, which may be the usual cobalt cemented tungsten carbide inserts, in a generally rectangular or diamond shape. These inserts 16 and 17 are positioned one against the leading wall of the groove (in the direc-tion of rotation of the disc, counterclockwise in the case of FIG. 1) and the other one agains the trailing wall of the groove. Each insert has its exposed cutting p (~ e/
edge-ssr~e~ to the cutting edge of the other insert and facing in the same direction. A typical wedge block 18 is wedged between the inserts 16 and 17 and retained within the groove by such means as a machine screw 19 passing through the wedge block 18 and into the disc mem-ber 11. Various combinations of tapering groove ~alls and tapered wedge block surfaces are known to be employed for insert retention purposes. ~n important point is that formerly only a single insert would be used for each groove. In this particular tool not only are two such inserts employed in front and back relationship as a set of inserts, but also multiple sets or pairs of sets are employed ~ in the groove. The unique relationship of these set inserts which permits their effective cut-ting action in sets, is more clearly shown in ~IG. 2.
Referring now to FIG. 2, the elevational view of an insert set 12 shows a leading insert 16 and a trailing insert 17 residing within a groove 13. Wedge block 18, with appropriate tapering front and back sur-faces, and screw means 19, is positioned between the inserts 16 and 17 to retain them in the groove in the usual manner.
~ 3~
Referring again to FIG. 1, in order -to more effectively utilize the closely spaced inserts in each set 12, they are arranged in pairs, as illustrated in FIG. 1, as a pair of sets 20. In one instance, the insert se-t 21 comprises a pair of inserts 22 and 23, -the inserts being 3 times the length of a typical insert 16 or having a cutting path equal in width to the to-tal cutting path of the tool.
Each insert 16 and 17 in each set 12 is laterally (generally radially) offset with respect to each other to provide some overlap in the cutting path. The overlap is predetermined among all insert sets 12 so that a clean cut is ob-tained and cutting forces axe more equalized amongst the inser-ts.
Also, the insert set 12 in each pair of se-ts 12 is laterally separated from an adjacent set 12 by means of spacer members 21. Spacer members 24 may be dowel like pins adjacent an insert 16 and 17 in each adjacent pair of sets 12 and fixes the overlap position of all insert sets.
Disc chatter is dampened in this invention by a combination of Eeatures. For example r the sets 12 of inserts in a given groove are mounted at uneven heights above the face of the disc member 12. For example, referring to FIG. 1 the pair 20 of insert sets 12 closest to the 6 o'clock position of the disc 11 are referred to as station 1, STA 1 reading counter clockwise to STA 7. The insert sets for STA 1 and 7 project above the face of disc member 11 a given distance ~hile STA 2 and 6 project further, and STA 3 and 5 project still further. STA 4 projects the furthest and is effectively utilized to wipe out any overlap marks.
A geometry change for leading and trailing inserts 16 and 17 using the same wedge has been employed for further vibration damping purposes. This is more clearly shown in FIG. 2. In FIG. 2 the leading insert 16 has its axial centerline at a positive rake ~osition while the trailing insert 17 has its axial centerline at a negative rake. T.1hen viewed from the disc center of FIG. 1, the radial rake is more negative for the ieading insert.
The forward rate of advance of the milling cutting tool is usually constant bu~ the improved geometrics of this invention lead to more effective metal removal and provide a non - ~ ~}~, chatter minimizing, tool.
This invention can be applied to various metal working tools where but one pocket is employed in a given tool holder. The invention, however, is more applicable to rotary tools having a plurality of pockets therein, and principally to a milling tool.
Although the present invention has been described with reference to the foregoing specification, many modifications, combinations and variations of the invention will be apparent to those s~illed in the art in light of the above teachings. It is therefore understood that changes may be made to the particular embodiments of the invention which are within the full scope of the invention as defined by the following claims.
-l- 6~P-2085 IMPROVED INSERT AR~ANGEMENT FQR A MILLING TOOL
This invention relates to multiple indexable insert metal working tools, and more particularly to rotary and milling kinds of tools where the cir~w~fcr^~ of the tool is the limi.ting ~actor to S the number of indexable inserts that can be effectively employed.
Background of the Invention A milling cutter may take the form oE a flat faced disc or body member which has a coaxial drive means on one side, and the other side, ~ace, includes a numbe~ of indexable cut-ters and corresponding lQ grooves, pockets or slots. The cutter inserts are arranged so -that when the face of the tool is brought up against a workpiece, for example a flat surface oE a workpiece, the inserts cut out or remove an annular groovel a saucer depressiQn ancl the like large area cuts.
The area of the face or the periphery area of the disc which is adapted to contain the cutter insert is the limiting Eact to the number of inserts that can gainfully be employed co~mensurate with the design and strength of the disc member. Obviously, existing disc members simply limit the num~er of inser-t cutters by their original design, since ordinarily there are no adjustment features. In the usual design, a milling cutter face includes a plurality of generally rectangular sockets or pockets therein. A single generally rectangular cutte~ inse~t is positioned in each pocket and a wedge block is used in the pocket tQ firmly wedge the in$ert in position. ~ further hindrance to the desired use of a gr~a~r number of inserts is the increased tool chatter which occurs when a plurality of inserts engage the ~Yorkp~ece with the same frequency and amplitude. An increase in the numbe~ ~f cutter inse~ts, commensurate with diminished chatter would represent a more desirable milling kind of tool. ~
$~
6~1p-20~5 Summary of the Invention I~ has now been discovered that the number of inserts in a disc cutter may nearly be doubled by a more effective use of wedges and inserts in slightly modiEied poc~ets.
In a given plunge milling cutter having one or more circular rows of pockets to contain insert and wedges, the pockets are made slightly wider, if neces-sary~ and in each pocket there is positioned a pair of inserts with an intermediate wedge. The insert position-ing geometry is modified to minimize chatter.
Brief Description of the Drawings This invention will be better understood when taken in connection with the following description and the drawings in which: FIG. 1 is a plan view of one embodiment of this invention AS a plunge mill cutter;
and FIG. 2 is a partial and side elevational view of a double insert arrangement as used in FIG. 1.
Description of Preferred Embodiment Referring now to FIG. 1 there is illustrated a plunge mill cutter 10 comprising a heavy wheel or disc member 11 and a plurality of repeating sets of inserts 12 arranged on the work- ing face thereof. The reverse face of the cutter 10 contains the usual drive means Eor ro-tating the disc member 11 about its concentric axis.
Disc member 11 includes a series of generally rectangular slots 13 which progress from the periphery of the disc towards the center 14 but purposefully not radi-ally. The center line of each groove with the exception of groove 15 is displaced from or offset from a center line of the circle in the direction of rotation a suit-3~9 60Mr-2085 able amount to provide a proper negative radial rake.
Also, some of the peripheral angular distances between groove centerlines at the outer periphery of the disc member are equal and some are unequal. The slots 13 have been slightly enlarged in width, for example about 25~, to accommodate the insert combination as illustrated.
Each repeating insert set 12 comprises two inserts 16 and 17, which may be the usual cobalt cemented tungsten carbide inserts, in a generally rectangular or diamond shape. These inserts 16 and 17 are positioned one against the leading wall of the groove (in the direc-tion of rotation of the disc, counterclockwise in the case of FIG. 1) and the other one agains the trailing wall of the groove. Each insert has its exposed cutting p (~ e/
edge-ssr~e~ to the cutting edge of the other insert and facing in the same direction. A typical wedge block 18 is wedged between the inserts 16 and 17 and retained within the groove by such means as a machine screw 19 passing through the wedge block 18 and into the disc mem-ber 11. Various combinations of tapering groove ~alls and tapered wedge block surfaces are known to be employed for insert retention purposes. ~n important point is that formerly only a single insert would be used for each groove. In this particular tool not only are two such inserts employed in front and back relationship as a set of inserts, but also multiple sets or pairs of sets are employed ~ in the groove. The unique relationship of these set inserts which permits their effective cut-ting action in sets, is more clearly shown in ~IG. 2.
Referring now to FIG. 2, the elevational view of an insert set 12 shows a leading insert 16 and a trailing insert 17 residing within a groove 13. Wedge block 18, with appropriate tapering front and back sur-faces, and screw means 19, is positioned between the inserts 16 and 17 to retain them in the groove in the usual manner.
~ 3~
Referring again to FIG. 1, in order -to more effectively utilize the closely spaced inserts in each set 12, they are arranged in pairs, as illustrated in FIG. 1, as a pair of sets 20. In one instance, the insert se-t 21 comprises a pair of inserts 22 and 23, -the inserts being 3 times the length of a typical insert 16 or having a cutting path equal in width to the to-tal cutting path of the tool.
Each insert 16 and 17 in each set 12 is laterally (generally radially) offset with respect to each other to provide some overlap in the cutting path. The overlap is predetermined among all insert sets 12 so that a clean cut is ob-tained and cutting forces axe more equalized amongst the inser-ts.
Also, the insert set 12 in each pair of se-ts 12 is laterally separated from an adjacent set 12 by means of spacer members 21. Spacer members 24 may be dowel like pins adjacent an insert 16 and 17 in each adjacent pair of sets 12 and fixes the overlap position of all insert sets.
Disc chatter is dampened in this invention by a combination of Eeatures. For example r the sets 12 of inserts in a given groove are mounted at uneven heights above the face of the disc member 12. For example, referring to FIG. 1 the pair 20 of insert sets 12 closest to the 6 o'clock position of the disc 11 are referred to as station 1, STA 1 reading counter clockwise to STA 7. The insert sets for STA 1 and 7 project above the face of disc member 11 a given distance ~hile STA 2 and 6 project further, and STA 3 and 5 project still further. STA 4 projects the furthest and is effectively utilized to wipe out any overlap marks.
A geometry change for leading and trailing inserts 16 and 17 using the same wedge has been employed for further vibration damping purposes. This is more clearly shown in FIG. 2. In FIG. 2 the leading insert 16 has its axial centerline at a positive rake ~osition while the trailing insert 17 has its axial centerline at a negative rake. T.1hen viewed from the disc center of FIG. 1, the radial rake is more negative for the ieading insert.
The forward rate of advance of the milling cutting tool is usually constant bu~ the improved geometrics of this invention lead to more effective metal removal and provide a non - ~ ~}~, chatter minimizing, tool.
This invention can be applied to various metal working tools where but one pocket is employed in a given tool holder. The invention, however, is more applicable to rotary tools having a plurality of pockets therein, and principally to a milling tool.
Although the present invention has been described with reference to the foregoing specification, many modifications, combinations and variations of the invention will be apparent to those s~illed in the art in light of the above teachings. It is therefore understood that changes may be made to the particular embodiments of the invention which are within the full scope of the invention as defined by the following claims.
Claims (3)
1. A rotary tool member comprising:
(a) a body member having a flat-faced surface adapted to face a surface of a workpiece for metal removal;
(b) said flat-faced surface of said body member having a plurality of grooves therein defining a leading and trailing wall and wherein the grooves are arranged to extend inwardly from the periphery of the rotary member;
(c) a plurality of sets of indexable inserts in said grooves and extending inwardly from the periphery of the rotary member, the inserts of which have a parallel cutting edge facing the leading wall;
(d) one of said inserts being positioned adjacent said leading wall and the other of said inserts being spaced therefrom and positioned adjacent the trailing wall of said groove, the inserts of each set being arranged to have a positive and negative axial rake respectively in the direction of rotation of the rotary member;
(e) a tapered wedge block member positioned in said groove and between said inserts; and (f) means adjustably retaining said wedge block in said groove to tightly wedge said inserts in their defined position.
(a) a body member having a flat-faced surface adapted to face a surface of a workpiece for metal removal;
(b) said flat-faced surface of said body member having a plurality of grooves therein defining a leading and trailing wall and wherein the grooves are arranged to extend inwardly from the periphery of the rotary member;
(c) a plurality of sets of indexable inserts in said grooves and extending inwardly from the periphery of the rotary member, the inserts of which have a parallel cutting edge facing the leading wall;
(d) one of said inserts being positioned adjacent said leading wall and the other of said inserts being spaced therefrom and positioned adjacent the trailing wall of said groove, the inserts of each set being arranged to have a positive and negative axial rake respectively in the direction of rotation of the rotary member;
(e) a tapered wedge block member positioned in said groove and between said inserts; and (f) means adjustably retaining said wedge block in said groove to tightly wedge said inserts in their defined position.
2. A plunge mill cutter comprising in combination:
(a) a disc member having a flat face thereon;
(b) a plurality of peripherally inwardly directed insert grooves in said face, each groove having a center-line, the centerlines of none of which are coincident with a radial line of the disc;
(c) a plurality of sets of inserts positioned side by side axially in some of said grooves, each set comprising a leading and trailing insert in said grooves with a wedge block therebetween to tightly retain said inserts against respective walls of said grooves;
(d) the inserts in each set being laterally offset or overlapping with respect to each other and having parallel cutting edges;
(e) a spacing member between adjacent sets of inserts; and (f) one set of inserts in one of said grooves having a total cutting width equal in length to the total cutting path of the milling cutter and each set of inserts of the remainder of the plurality of sets of inserts having a total cutting width less than the length of the total cutting path of the milling cutter.
(a) a disc member having a flat face thereon;
(b) a plurality of peripherally inwardly directed insert grooves in said face, each groove having a center-line, the centerlines of none of which are coincident with a radial line of the disc;
(c) a plurality of sets of inserts positioned side by side axially in some of said grooves, each set comprising a leading and trailing insert in said grooves with a wedge block therebetween to tightly retain said inserts against respective walls of said grooves;
(d) the inserts in each set being laterally offset or overlapping with respect to each other and having parallel cutting edges;
(e) a spacing member between adjacent sets of inserts; and (f) one set of inserts in one of said grooves having a total cutting width equal in length to the total cutting path of the milling cutter and each set of inserts of the remainder of the plurality of sets of inserts having a total cutting width less than the length of the total cutting path of the milling cutter.
3. The invention as recited in claim 2 wherein each set of inserts has the leading insert at a positive axial rake and the trailing insert at a negative axial rake.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000464168A CA1234969A (en) | 1984-09-27 | 1984-09-27 | Insert arrangement for a milling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000464168A CA1234969A (en) | 1984-09-27 | 1984-09-27 | Insert arrangement for a milling tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1234969A true CA1234969A (en) | 1988-04-12 |
Family
ID=4128786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000464168A Expired CA1234969A (en) | 1984-09-27 | 1984-09-27 | Insert arrangement for a milling tool |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1234969A (en) |
-
1984
- 1984-09-27 CA CA000464168A patent/CA1234969A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |