EP0912773A1 - Use of a steel for cutting tool holders - Google Patents
Use of a steel for cutting tool holdersInfo
- Publication number
- EP0912773A1 EP0912773A1 EP97930936A EP97930936A EP0912773A1 EP 0912773 A1 EP0912773 A1 EP 0912773A1 EP 97930936 A EP97930936 A EP 97930936A EP 97930936 A EP97930936 A EP 97930936A EP 0912773 A1 EP0912773 A1 EP 0912773A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steel
- max
- use according
- steel contains
- traces
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
Definitions
- the invention relates to the use of a steel with a specific composition, as a material for cutting tool holders.
- a cutting tool holder is the body on or in which the tool bit, that is active during the niachining operation, is attached.
- Cutter- and drill bodies are typical cutting tool holders, which are provided with active machining carbide elements.
- the material in such cutting tool holders is usually a steel which is referred to as holder steel in this technical field. A number of requirements are raised upon holder steels:
- Some cutting tool holders are tough-hardened, while those surfaces against which the carbide bits are attached are induction-hardened. Therefore h must be possible for the material to be induction-hardened.
- Some types of cutting tool holders such as certain drill bodies with carbide tips which are attached by soldering, are PVD-coated subsequent to the hardening operation in order that the cuttings of the borings shall not wear out the drilling spiral in the drill body. Therefore, it must be possible to PVD-coated the material without any significant hardness reduction.
- Some types of cutting tool holders such as cutter bodies, are subjected to high pulsating loads when they are in use.
- the material therefor must have good mechanical features, including a good toughness and fatigue strength.
- Many types of cutting tool holders have a very complicated shape. Small threaded holes, and long, narrow borings frequently occur. Therefore the material shall have a good machinability, particularly when high speed steel tools are used.
- Low or medium alloyed tool steels are used as materials for cutting tool holders.
- the composition of a number of typical holder steels are listed in the table below. Besides the element mentioned in the table, which refer to weight- %, the steels only contain iron, and impurities and accessory elements. None of the known holder steels satisfies the above specified requirements in a completely satisfactory way.
- the invention suggests a steel alloy intended to be used as a material for cutting tool holders, which satisfies the said requirements more satisfactorily than the steels of prior art.
- the composition of the steel is given in the appending claims.
- the invention also relates to cutting tool holders made of the steel.
- Carbon shall exist in an amount of at least 0.3%, preferably at least 0.35%, suitably at least 0.37%, in order that the steel shall obtain a desired hardness and strength.
- the carbon content must not exceed 0.5%, preferably not exceed 0.45%, and suitably not exceed 0.41%.
- the steel can be too hard and brittle.
- the steel contains 0.39%C.
- Silicon may exist in amounts from a trace amount to a maximum of 1.5%, but preferably the steel should contain at least 0.40% Si.
- the silicon exists in the steel in a dissolved state, but can also exist as silicon-calcium oxides, which in their turn are preferably modified by means of sulphur, which in the form of sulphides may cover the oxide and make it essentially plastic, wherein the said inclusions can function as a lubricating film when the steel is being machined.
- the steel should not contain more than 1.2% Si. Preferred ranges are 0.7-0.9% Si or 0.6-0.8% Si. A typical (nominal) Si content is 0.7%.
- Manganese shall exist in an amount of at least 0.2% in order to improve the tempering resistance of the steel and in order to prevent redbrittleness of the steel through the formation of maganese sulphides, when the steel contains higher amounts of sulphur.
- the steel shall not contain more than 1.5% maganese, preferably max. 1.0% Mn. A particularly preferred range is 0.3-0.5% Mn.
- An optimal maganese content is 0.4%.
- Sulphur shall exist in an amount of at least 0.01% in order to give the steel an adequate machinability.
- the steel shall not contain more than at most 0.2% S. If the sulphur content is higher, there is a risk that redbrittleness may occur, which can not be completely compensated by a correspondingly high content of maganese.
- the steel should not contain more than max. 0.05% sulphur.
- a preferred content of sulphur lies in the range 0.01-0.03% S.
- a typical (nominal) sulphur content is 0.02%.
- Chromium shall exist in the steel in an amount between 4 and 7% in order to give the steel a good hardenability.
- a preferred range is 4.5-5.5% Cr; typically 5.0% Cr.
- Nickel is not a critical element in the steel, but can be tolerated in an amount up to 1%, preferably max. 0.5%.
- Molybdenum improves the hardenability of the steel and also its tempering resistance and hence its hot hardness and shall therefor exist in an amount of at least 0.5%; max. 2.0%. A preferred range is 1.2% Mo, preferably 1.2-1.6% Mo. Typically, the steel contains 1.4% Mo. In principal, molybdenum can be replaced completely or partly by the double amount of tungsten. Tungsten, however, is an expensive alloy metal and it also complicates the handling of return scrap. Therefore, tungsten should be avoided in amounts higher than amounts recognised as impurities.
- Cobalt for the same reason as tungsten, should not exist in the steel but can be tolerated in amounts up to max. 1.0%, preferably max. 0.05%.
- Vanadium is favourable for the tempering resistance and the wear strength of the steel and shall exist in the steel in an amount of at least 0.2%, but not exceed 1.5%.
- the vanadium content should lie between 0.6-1.3%, suitably between 0.8- 1.1%; typically the content ofvanadiumis ⁇ .95%.
- the steel can also contain oxygen and calcium in functional amounts, more particularly 50-100 ppm oxygen and 5-75 ppm calcium in order to interact to form calcium oxides, which are modified by means of sulphur as has been mentioned in the foregoing.
- Niobium forms primary carbonitrides which are difficult to dissolve and shall not exist in amounts above 0.5%.
- niobium should not exist in amounts above impurity level.
- titanium, zirconium, aluminium and other strong carbide and/or nidrideformers are impurities which are not desired and therefore shall not exist in amounts above impurity level.
- Rare earth metals such as cerium, lanthanum and others can possibly be added to the steel in order to afford the steel isotropic features, optimal machinability, good mechanical features, and a good hot- workability.
- the total content of the rare earth metals can amount to max. 0.4%, preferably max. 0.2%.
- the nominal (typical) composition has the following specification: 0.37-0.41 C, 0.40- 1.20 Si, 0.30-0.50 Mn, max. 0.025 P, 0.010-0.030 S, 5.00-5.30 Cr, max. 0.25 Ni, 1.25- 1.50 Mo, max. 0.20 W, max. 0.20 Co, 0.90-1.00 V, max. 0.005 Ti, max. 0.030 Nb, max. 0.25 Cu, max. 0.020 Al 5-50 ppm Ca, 60-90 ppm O, balance iron.
- the steel is hardened from an austenitizing temperature between 860 and 1100°C, preferably between 960 and 1050°C, wherein the hardening temperature is chosen within said range depending on the desired hardness.
- the steel is hardened from a temperature within the lower part of the range 960 - 1050°C, more particularly from a temperature of 960°C or slightly above that temperature, it is possible to achieve a hardness of 48 HRC while it is possible to achieve a hardness of 54 HRC if the steel is hardened from a temperature within the upper part of the range 960 - 1050°C, i.e. at or near 1050°C, prior to tempering.
- Tempering can be performed either as low temperature tempering from a temperature between 180- 250°C, or as high temperature tempering from a temperature between 550-600°C in order to provide high hardness in combination with good toughness.
- the drawing shows typical tempering curves for a steel according to the invention after hardening from different temperatures between 960 and 1025°C.
- compositions according to Table 1 were manufactured.
- the given contents of the elements of the compositions are mean values of measurements made on different places in the ingots that were manufactured.
- the composition of reference material, SS 2242 has also been included.
- the contents of the reference material are nominal contents.
- the content of phosphorus, sulphur, aluminium, nitrogen, calcium, and oxygen have not been mentioned.
- the balance is iron and impurities which can exist in normal amounts in addition to those impurities or accessory elements that are mentioned in the table.
- Table 1 results from machinability tests which were performed on material in the soft annealed state are also shown.
- the mentioned values refer to the periphery speed of the drill (mean value) in which the drill is rotated so that the total length of 1000 mm shall be achieved before the drill is worn out. Also, the number of borings that are possible to drill at a drilling rate of 30 m/min, before the drill is worn out, are stated in the table.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Scissors And Nippers (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Heat Treatment Of Steel (AREA)
- Turning (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9602494A SE507851C2 (en) | 1996-06-25 | 1996-06-25 | Use of a steel as a material for cutting tool holders |
SE9602494 | 1996-06-25 | ||
PCT/SE1997/001112 WO1997049838A1 (en) | 1996-06-25 | 1997-06-23 | Use of a steel for cutting tool holders |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0912773A1 true EP0912773A1 (en) | 1999-05-06 |
EP0912773B1 EP0912773B1 (en) | 2001-10-31 |
Family
ID=20403138
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97930936A Expired - Lifetime EP0912773B1 (en) | 1996-06-25 | 1997-06-23 | Use of a steel for cutting tool holders |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0912773B1 (en) |
JP (1) | JP4210331B2 (en) |
CN (1) | CN1070929C (en) |
AT (1) | ATE207977T1 (en) |
AU (1) | AU709145C (en) |
DE (1) | DE69707883T2 (en) |
ES (1) | ES2164356T3 (en) |
HK (1) | HK1020360A1 (en) |
SE (1) | SE507851C2 (en) |
WO (1) | WO1997049838A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2782465B1 (en) * | 1998-08-20 | 2000-11-10 | Stephane Badot | KNIFE FOR A KNIFE HOLDER OF A GRANULATING DEVICE FOR PLASTIC MATERIALS, AS WELL AS KNIFE HOLDER AND GRANULATING DEVICE COMPRISING SUCH A KNIFE |
SE515624C2 (en) | 1999-11-02 | 2001-09-10 | Ovako Steel Ab | Air-curing low- to medium-carbon steel for improved heat treatment |
CN102165086B (en) * | 2008-07-24 | 2017-02-08 | Crs 控股公司 | high strength, high toughness steel alloy |
CN102212760A (en) * | 2011-06-10 | 2011-10-12 | 钢铁研究总院 | Steel with high toughness and ultrahigh strength |
PT2896713T (en) | 2014-01-16 | 2016-07-07 | Uddeholms Ab | Stainless steel and a cutting tool body made of the stainless steel |
CN105132827B (en) * | 2015-09-09 | 2017-03-29 | 南京工程学院 | A kind of high heat-intensity forged steel material for obtaining ultra tiny compound yardstick carbide |
CN105734441B (en) * | 2016-04-20 | 2017-10-03 | 上海瀚氏模具成型有限公司 | A kind of preparation method of nanosizing low-alloy heat-resistant high-strength steel mould |
CN105714203B (en) * | 2016-04-20 | 2017-12-08 | 上海瀚氏模具成型有限公司 | A kind of preparation method of making Nano surface high-strength temperature-resistant steel mold |
CN105886933B (en) * | 2016-05-12 | 2021-04-30 | 天津钢研海德科技有限公司 | Hot work die steel with high tempering softening resistance and high toughness and manufacturing method thereof |
TWI756226B (en) | 2016-06-30 | 2022-03-01 | 瑞典商伍德赫爾恩股份有限公司 | A steel for a tool holder |
CN108385025A (en) * | 2018-04-09 | 2018-08-10 | 武汉科技大学 | A kind of Slab Deburring Machine blade and its manufacturing method |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE426177B (en) * | 1979-12-03 | 1982-12-13 | Uddeholms Ab | Hot work tool steel |
AT396560B (en) * | 1992-05-06 | 1993-10-25 | Boehler Ybbstalwerke | METAL SAW BLADE WITH HIGH FLEXIBILITY AND HIGH CUTTING PERFORMANCE |
-
1996
- 1996-06-25 SE SE9602494A patent/SE507851C2/en not_active IP Right Cessation
-
1997
- 1997-06-23 JP JP50282998A patent/JP4210331B2/en not_active Expired - Lifetime
- 1997-06-23 CN CN97195775A patent/CN1070929C/en not_active Expired - Lifetime
- 1997-06-23 ES ES97930936T patent/ES2164356T3/en not_active Expired - Lifetime
- 1997-06-23 WO PCT/SE1997/001112 patent/WO1997049838A1/en active IP Right Grant
- 1997-06-23 AU AU34693/97A patent/AU709145C/en not_active Expired
- 1997-06-23 AT AT97930936T patent/ATE207977T1/en active
- 1997-06-23 DE DE69707883T patent/DE69707883T2/en not_active Expired - Lifetime
- 1997-06-23 EP EP97930936A patent/EP0912773B1/en not_active Expired - Lifetime
-
1999
- 1999-11-26 HK HK99105480A patent/HK1020360A1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9749838A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE69707883D1 (en) | 2001-12-06 |
AU3469397A (en) | 1998-01-14 |
ES2164356T3 (en) | 2002-02-16 |
SE9602494L (en) | 1997-12-26 |
JP2000514500A (en) | 2000-10-31 |
AU709145C (en) | 2001-10-18 |
JP4210331B2 (en) | 2009-01-14 |
HK1020360A1 (en) | 2000-04-14 |
CN1070929C (en) | 2001-09-12 |
ATE207977T1 (en) | 2001-11-15 |
SE507851C2 (en) | 1998-07-20 |
EP0912773B1 (en) | 2001-10-31 |
SE9602494D0 (en) | 1996-06-25 |
CN1222942A (en) | 1999-07-14 |
WO1997049838A1 (en) | 1997-12-31 |
DE69707883T2 (en) | 2002-04-25 |
AU709145B2 (en) | 1999-08-19 |
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