GB2095140A - Cutting tool bits - Google Patents
Cutting tool bits Download PDFInfo
- Publication number
- GB2095140A GB2095140A GB8206231A GB8206231A GB2095140A GB 2095140 A GB2095140 A GB 2095140A GB 8206231 A GB8206231 A GB 8206231A GB 8206231 A GB8206231 A GB 8206231A GB 2095140 A GB2095140 A GB 2095140A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cutting edge
- tool bit
- turning
- auxiliary cutting
- auxiliary
- 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.)
- Granted
Links
- 238000005520 cutting process Methods 0.000 title claims abstract description 48
- 239000000463 material Substances 0.000 claims description 11
- 238000003754 machining Methods 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 3
- 229910000997 High-speed steel Inorganic materials 0.000 description 2
- 101100129500 Caenorhabditis elegans max-2 gene Proteins 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/141—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/12—Side or flank surfaces
- B23B2200/125—Side or flank surfaces discontinuous
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/20—Top or side views of the cutting edge
- B23B2200/204—Top or side views of the cutting edge with discontinuous cutting edge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2220/00—Details of turning, boring or drilling processes
- B23B2220/40—Peeling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2220/00—Details of turning, boring or drilling processes
- B23B2220/44—Roughing
- B23B2220/445—Roughing and finishing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Turning (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
Abstract
A tool bit for machining or cutting operations, e.g., skin-turning or rough- turning of metal rods, comprises a cutting edge having two successive main cutting edge portions 1, 2 and two successive auxiliary cutting edge portions 3, 4 so disposed as to generate two independent chips. <IMAGE>
Description
SPECIFICATION
A tool bit for skin turning or shaft turning
The invention relates to a tool bit for skin turning of shaft turning, comprising a plurality of successive cutting edges.
The skin turning or rough turning of rods, tubes or, for example, wire is used on a large scale. The operators of skin-turning machines and the manufacturers of tools for such machines are therefore constantly endeavouring to improve working conditions to enable inexpensive and highquality products to be manufactured. Particular attention is devoted to the cutting edge geometry and the configuration of the cutting element, which is usually a tool bit made of high-speed steel or cutting metal or a combination of these two materials. The tool bit is a single or multiedged cutting tool depending upon the intended purpose.
A cutting tool for skin-turning or for shaft turning is known in which the tool bit is constructured as an elongate octagon (German patent spec. 1 800 195). This tool bit gives very good results as regards the surface finish of the skin-turned material.
To obtain a very considerable chip depth with large feeds it is known so to construct the tool bit that it comprises a first main cutting edge and an auxiliary cutting edge (German
Offenlegungsschrift 28 25 748).
The object of the invention is to provide a tool bit giving high cutting capacity, close tolerances, and good surface finish of the machined material.
To this end, according to the invention, a first main cutting edge, followed by a first auxiliary cutting edge, a second main cutting edge, and a second auxiliary cutting edge, are so arranged that two independent chips are formed during the cutting operation.
According to one embodiment of the invention, the length a of the first auxiliary cutting edge is defined by the equation
Ln
a max
2 where Ln denotes the portion from the beginning of the first auxiliary cutting edge to the end of the second auxiliary cutting edge.
In another embodiment of the invention, the distance b between the first and second auxiliary cutting edges is defined by the equation
b=0.1 to0.5+K where K is the known work-hardened zone of the particular pre-machined material used.
The main advantages of the invention are that rough and finished skin-turning with good smoothing and guidance properties at the same time are possible with a single tool bit. This results in close tolerances and a high surface finish of the workpiece for machining with good tool bit life.
The invention will be explained in detail with
reference to the drawings wherein:
Figs. 1-3 illustrate a tool bit according to the
invention in three views.
Fig. 4 shows details of a new tool bit.
Fig. 5 is a tool bit according to the invention
together with a workpiece for machining and
Fig. 6 is a known graph to show factor K.
It will be seen from Figs. 1 to 5 that the new
tool bit 9 produces two separate chips. The
function of the main cutting edge 1 is to provide
the rough cut.
The following first auxiliary cutting edge 2 is
preferably of a length a which is not greater than
half the length Ln (Fig. 4). Dimensions of this kind
allow feeds
Ln s=- X f,
2
where the factor fits between 0.7 and 0.9. The
workpiece 7 for machining in Fig. 5 is pre
smoothed and guided by the first auxiliary cutting
edge 2.
The second main cutting edge 3 is used for final
machining. It is followed by the second auxiliary cutting edge 4 by means of which the workpiece 7 is finally smoothed to ensure close tolerances and provide a.high surface finish.
There should be a distance b=0.1 toO.5+K between the first and the second auxiliary cutting edges 2 and 4 (Fig. 4). K denotes the workhardened zone of the preliminary machined material and may be determined in known manner. Fig. 6 is a graph of this kind. In this example the work-hardened zone K is in the region from 0 to 0.4 mm; the hardness in this workhardened zone is much higher than in the nonwork-hardened zone of the material.
The first auxiliary cutting edge 2 is advantageously at an angle y = 0 to 15 , preferably 0 to 5 , to the axis 8 of the workpiece 7 (Fig. 5). As shown at reference 10 in Fig. 5, the first auxiliary cutting edge 2 may be re-entrant in relation to the second main cutting edge 3.
The second main cutting edge 3 does not necessarily extend parallel to the first main cutting edge 1 but the angle p in Fig. 4 should be less than 900 and the second auxiliary cutting edge 4 should be parallel to the axis 8 of the workpiece 7.
The angle a in Fig. 5, i.e. the angle of entry of the first main cutting edge 1 is preferably 1 50 + 100, depending upon the chip depth and the material for machining, and in extreme cases it may be as much as 350
The surfaces 5 in Figs. 1-3 act as retention and clamped surfaces in known clamping tools.
The tool bit 9 can also be secured by means of the bore 6 and a fixture of appropriate construction.
Other conventional types of fixing are also possible.
The materials for the tool bit will primarily be cutting metal and high-speed steel, or a combination of these two materials. Other cutting materials, e.g. ceramics, are also possible.
Claims (4)
1. A tool bit for skin turning or shaft turning, comprising a plurality of successive cutting edges, characterised in that a first main cutting edge (1), followed by a first auxiliary cutting edge (2), a second main cutting edge (3);and a second auxiliary cutting edge (4), are so arranged that two independent chips are formed during the cutting operation.
2. A tool bit according to claim 1, characterised in that the length (a) of the first auxiliary cutting edge (2) is defined by the equation
Ln
amax
2 where Ln denotes the portion from the beginning of the first auxiliary cutting edge (2) to the end of the second auxiliary cutting edge (4).
3. A tool bit according to claim 1, characterised in that the distance (b) between the first (2) and the second (4) auxiliary cutting edges is defined by the equation b =0.1-0.5 + K where K is the known work-hardened zone of the particular pre-machined material.
4. A tool bit for skin turning or shaft turning, substantially as herein described with reference to, and as illustrated in, the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3109176A DE3109176C2 (en) | 1981-03-11 | 1981-03-11 | Cutting insert for peeling or shaft turning |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2095140A true GB2095140A (en) | 1982-09-29 |
| GB2095140B GB2095140B (en) | 1985-10-30 |
Family
ID=6126878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8206231A Expired GB2095140B (en) | 1981-03-11 | 1982-03-03 | Cutting tool bits |
Country Status (12)
| Country | Link |
|---|---|
| JP (1) | JPS57178606A (en) |
| AT (1) | AT388322B (en) |
| BE (1) | BE892368A (en) |
| CH (1) | CH655261A5 (en) |
| DE (1) | DE3109176C2 (en) |
| ES (1) | ES510347A0 (en) |
| FR (1) | FR2501553B1 (en) |
| GB (1) | GB2095140B (en) |
| IT (1) | IT1190726B (en) |
| LU (1) | LU83970A1 (en) |
| NL (1) | NL8200784A (en) |
| SE (1) | SE450349B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4572042A (en) * | 1983-06-27 | 1986-02-25 | Santrade Limited | Cutting insert |
| EP0313534A2 (en) * | 1987-10-19 | 1989-04-26 | Seco Tools Ab | Method for chip removing machining |
| EP1902799A2 (en) * | 2006-09-25 | 2008-03-26 | Sandvik Intellectual Property AB | A tool for chip removing machining and a cutting insert therefor |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6045611U (en) * | 1983-09-03 | 1985-03-30 | 東京部品工業株式会社 | Tips for cutting tools |
| JP2518305B2 (en) * | 1987-09-14 | 1996-07-24 | 三菱マテリアル株式会社 | Finishing Throw-away Chip |
| DE4316822A1 (en) * | 1993-05-19 | 1994-11-24 | Saar Hartmetall & Werkzeuge | Cutting insert for peeling or shaft turning |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB902193A (en) * | 1960-12-08 | 1962-07-25 | Murex Ltd | Improvements in or relating to metal cutting tools |
| FR1587936A (en) * | 1968-09-30 | 1970-04-03 | ||
| BE794309A (en) * | 1972-03-07 | 1973-05-16 | Hertel Karl | TOOL TO NIP TREES BY REMOVING CHIPS |
| DE2238887C3 (en) * | 1972-08-07 | 1979-07-05 | Stahlwerke Roechling - Burbach Gmbh, 6620 Voelklingen | Chip-removing tool for peeling or shaft turning |
| DE2238888C3 (en) * | 1972-08-07 | 1979-10-04 | Stahlwerke Roechling - Burbach Gmbh, 6620 Voelklingen | Chip-removing tool for peeling or shaft turning |
| FR2359667A1 (en) * | 1976-07-29 | 1978-02-24 | Ugine Aciers | Tungsten carbide cutter for round bar - is multi-sided and angle between faces is obtuse |
| US4084917A (en) * | 1976-11-10 | 1978-04-18 | Zahnradfabrik Friedrichshafen Ag | Turning tool, especially for copying turning |
| US4188162A (en) * | 1977-12-27 | 1980-02-12 | The Valeron Corporation | Indexable insert drill |
| DE2820810A1 (en) * | 1978-05-12 | 1979-11-15 | Kieserling & Albrecht | Blade for metal shaving machine tool - has inclined contour formed in two stages to reduce risk of fracture |
| DE2825748A1 (en) * | 1978-06-12 | 1979-12-13 | Roechling Burbach Weiterverarb | DEVICE FOR SHEARING OR SHAFT ROTATION |
| JPS5746082Y2 (en) * | 1979-06-05 | 1982-10-12 |
-
1981
- 1981-03-11 DE DE3109176A patent/DE3109176C2/en not_active Expired
-
1982
- 1982-02-23 LU LU83970A patent/LU83970A1/en unknown
- 1982-02-24 SE SE8201148A patent/SE450349B/en not_active IP Right Cessation
- 1982-02-26 NL NL8200784A patent/NL8200784A/en not_active Application Discontinuation
- 1982-03-02 FR FR8203391A patent/FR2501553B1/en not_active Expired
- 1982-03-03 GB GB8206231A patent/GB2095140B/en not_active Expired
- 1982-03-04 BE BE6/47617A patent/BE892368A/en not_active IP Right Cessation
- 1982-03-04 AT AT0084182A patent/AT388322B/en not_active IP Right Cessation
- 1982-03-10 JP JP57036697A patent/JPS57178606A/en active Granted
- 1982-03-10 IT IT20060/82A patent/IT1190726B/en active
- 1982-03-10 CH CH1471/82A patent/CH655261A5/en not_active IP Right Cessation
- 1982-03-11 ES ES510347A patent/ES510347A0/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4572042A (en) * | 1983-06-27 | 1986-02-25 | Santrade Limited | Cutting insert |
| EP0313534A2 (en) * | 1987-10-19 | 1989-04-26 | Seco Tools Ab | Method for chip removing machining |
| EP0313534A3 (en) * | 1987-10-19 | 1990-06-06 | Seco Tools Ab | Cutting insert |
| EP1902799A2 (en) * | 2006-09-25 | 2008-03-26 | Sandvik Intellectual Property AB | A tool for chip removing machining and a cutting insert therefor |
| EP1902799A3 (en) * | 2006-09-25 | 2012-06-13 | Sandvik Intellectual Property AB | A tool for chip removing machining and a cutting insert therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| LU83970A1 (en) | 1982-07-08 |
| CH655261A5 (en) | 1986-04-15 |
| JPH0113961B2 (en) | 1989-03-09 |
| JPS57178606A (en) | 1982-11-02 |
| SE8201148L (en) | 1982-09-12 |
| DE3109176A1 (en) | 1982-09-23 |
| IT1190726B (en) | 1988-02-24 |
| AT388322B (en) | 1989-06-12 |
| ES8302502A1 (en) | 1983-02-01 |
| SE450349B (en) | 1987-06-22 |
| NL8200784A (en) | 1982-10-01 |
| FR2501553B1 (en) | 1985-06-28 |
| GB2095140B (en) | 1985-10-30 |
| FR2501553A1 (en) | 1982-09-17 |
| BE892368A (en) | 1982-07-01 |
| IT8220060A0 (en) | 1982-03-10 |
| ATA84182A (en) | 1988-11-15 |
| DE3109176C2 (en) | 1986-09-25 |
| ES510347A0 (en) | 1983-02-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |