US20130136647A1 - Powder-metallurgical steel - Google Patents
Powder-metallurgical steel Download PDFInfo
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- US20130136647A1 US20130136647A1 US13/666,164 US201213666164A US2013136647A1 US 20130136647 A1 US20130136647 A1 US 20130136647A1 US 201213666164 A US201213666164 A US 201213666164A US 2013136647 A1 US2013136647 A1 US 2013136647A1
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- Prior art keywords
- steel
- powder
- raw mixture
- binding agent
- blank
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding
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- B22F1/0059—
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B22F5/106—Tube or ring forms
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
- C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
- C22C33/0285—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with Cr, Co, or Ni having a minimum content higher than 5%
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- 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
Definitions
- the present invention relates to a method for producing a powder-metallurgical steel, a raw mixture for producing a steel, a powder-metallurgical steel for producing a tool, and a steel.
- cylindrical rods for manufacturing cutting tools are produced from HSS or HSS-E by rolling or drawing.
- blanks can be made from hard metal or cermets using much simpler equipment and processes. Blanks can be produced from hard metal or cermets by extrusion and subsequent sintering. Pertinent manufacturing processes are known from example from U.S. Pat. No. 2,422,994, DE 36 01 385 A1, EP 465 946 A1, EP 1 017 527 B1, EP-A-0 340 495, EP-A-0 458 774, WO-A-92/22390 or US-A-4 779 440.
- the advantage of the extrusion process is that continuous rods can be created thereby, which are favourable for producing drilling, milling, reaming or countersinking tools, because the raw material (green body) can already be formed into the desired cylindrical shape by processing in this way, which can serve as an ideal starting point for manufacturing drilling, milling, reaming or countersinking tools.
- Extruding is also advantageous in that for example internal channels can be arranged inside the extruded rods during extrusion by simple expansions of the extruding nozzle. These inner channels may serve in the finished tool to transport coolants and/or lubricants through the interior of the tool to the cutting section of the tool.
- One object is therefore to provide the capability to obtain rods for manufacturing tools from HSS or HSS-E more simply.
- a further object is to provide a raw mixture with which such tools may be manufactured inexpensively.
- the method according to the invention for producing a powder-metallurgical steel, particularly a tool steel such as HSS or HSS-E steel is characterised in that first steel powder having a predetermined microstructure is produced.
- a plastically deformable raw mixture is produced by mixing the steel powder with a binding agent such as wax or paraffin, which raw material may directly undergo a preforming process—preferably based on suitable selection of the particle size and/or particle size distribution of the steel powder.
- a binding agent such as wax or paraffin
- the actual creation of the microstructure takes place during sintering of the blank, that is to say the steel particles, which are preferably as close to spherical in shape as possible to assist in the extrusion process, are fused and merge closely together, yielding an extremely dense, extremely strong steel component.
- the microstructure inside the steel powder particles is substantially preserved, so that predictable material properties remain. It has been observed that the pressure that is generated during extrusion through a nozzle is sufficient to produce a blank constituted by a raw mixture of steel/bonding agent of sufficient density and strength following sintering process under approximately atmospheric pressure.
- the microstructure may be further improved by implementing a hot isostatic pressing (HIP) process in parallel with or subsequent to the extrusion.
- HIP hot isostatic pressing
- the steel powder undergoes processing to homogenize the geometry of the powder particles while and/or before it is mixed with the binding agent.
- the original microstructure of the steel powder may be selected optimally, independently of the production process.
- the material property of the manufactured steel may also be modified widely.
- the blank undergoes a hot isostatic pressing (HIP) process before, during or after sintering.
- HIP hot isostatic pressing
- the blank undergoes thermal treatment, such as a hardening process, to control the steel microstructure during the sintering process.
- thermal treatment such as a hardening process
- the plastically deformable mass is preferably extruded through an extrusion die with a nozzle to form a continuous rod, which is then cut to the necessary length without interruption.
- the blanks may be manufactured very inexpensively.
- a capability is provided for obtaining powder-metallurgical steel more easily.
- steel in powder form is processed in similar manner to the process used for manufacturing hard metal, with the addition of a binding agent.
- the powdered steel with the binding agent is then extruded and sintered.
- a further aspect of the invention consists in the provision of a raw mixture for manufacturing a steel according to claim 12 .
- a method is provided in which cobalt is also used as a binding metal.
- a method in which pressing is carried out in an extrusion die with a nozzle, so that the raw mixture may be extruded to form a continuous rod.
- a method in which at least sections of an interior channel are arranged for transporting coolant and/or lubricant during the extrusion process.
- a method in which at least sections of the interior channel are constructed in the form of a coil or as straight sections.
- a steel is provided wherein the steel may be manufactured from a raw mixture according to claim 6 .
- powder-metallurgical steel may be manufactured more easily and inexpensively.
- a high-alloy steel for example may also serve as the starter material.
- the powder may also be ground by spray forming the steel melt.
- the manufacture of a powder-metallurgical steel according the invention requires little production equipment and is therefore less expensive during manufacturing than the techniques of the prior art. It is also possible to achieve a higher rate of production than with the manufacturing processes according to the prior art when the method according to the invention is used to produce powder-metallurgical steel.
- FIG. 1 shows a diagram illustrating the steps of the method according to the invention
- FIG. 2 shows a nozzle for extruding a continuous powder-metallurgical rod.
- powdered steel in the manufacture of powder-metallurgical steels.
- This steel is typically a high-alloy steel which may contain for example 0.46% carbon and 13% chromium.
- the powdered steel is compacted by repeated rolling.
- the resulting blocks may be used to manufacture tools, for example.
- Cooling channel may be provided by introducing drillholes into the partially compacted steel between the first rolling operations.
- FIG. 1 shows the process workflow according to the invention for manufacturing a powder-metallurgical steel, particularly a tool steel, such as HSS or HSS-E steel.
- steel powder is produced in a first process step, wherein the steel powder preferably has a previously selected microstructure, such as the microstructure of a high speed steel in the cast condition, or that of a high speed steel that has already been substantially structured.
- the steel powder may undergo treatment to homogenize the geometry of the powder particles—in a ball mill for example. This removes edges of the powder particles and the particles are rendered essentially spherical, thereby making the subsequent preforming process easier.
- the steel powder it is also possible and advantageous to subject the steel powder to a selection process before it is mixed, so that it has a predefined particle size and/or particle size distribution when it undergoes the mixing process.
- the raw mixture obtained thereby is now preformed to produce a blank having a predetermined spatial form, preferably using an extrusion die to manufacture blanks having a structure with any degree of spatial complexity.
- the binding agent is expelled at selected temperatures during the subsequent sintering step, or also in a prior work step. This is followed by the actual sintering operation, in which the final steel microstructure is produced.
- the blank may undergo hot isostatic pressing (HIP) treatment before, during or after sintering. This optional method step is indicated with a dashed line in FIG. 1 .
- HIP hot isostatic pressing
- the blank may undergo thermal treatment, for example a hardening process, during the sintering process to control the steel microstructure.
- thermal treatment for example a hardening process
- the sintering system cycles through a predetermined, temporally controlled thermal profile at the end of which the steel has the desired microstructure quality.
- the steel powder may also be obtained by grinding or crushing steel particles.
- the blanks (green bodies) obtained in the form of a steel/bonding agent mixture in the extrusion step may thus be processed in similar manner to the production of hard metal or cermets.
- Processing with an extrusion die, which may be equipped with a nozzle for extrusion, and the subsequent sintering operation enable a powder-metallurgical steel to be manufactured simply, rapidly and advantageously.
- the output form as a continuous rod from the extrusion process is advantageous because the shape may already approximate the geometrical shape of a drilling, milling, countersinking or reaming tool.
- Steel that exists in powdered form is thus treated and processed according to the invention, for example tungsten carbides as the starting material for manufacturing hard metal (with the addition of a binding agent such as cobalt).
- internal channels may also be conformed in the extruded rod advantageously and simply, particularly the dimensions of which (diameter, circular or elliptical cross section) cannot be modified to the same degree by the subsequent processing operations, such as sintering, as may be the case in comparative terms with the processing method of the prior art, due to rolling, for example. Consequently, a higher degree of dimensional accuracy in the production of interior channels in powder-metallurgical steels may be assured.
- FIG. 1 shows in exemplary manner a nozzle for extruding a continuous rod, wherein a raw mixture is compressed into the nozzle through an inlet aperture 103 , 104 that may have an annular surface area.
- the raw mixture comprises powdered steel, wherein the steel may also be high alloy steel, and at least one additional binding agent, such as cobalt.
- the raw mixture is merged in area 105 , wherein twisted interior channels 101 may be conformed in the compacted raw mixture, for example by continuously rotating rods 107 .
- a continuous rod 106 with interior channels 101 may exit through nozzle 102 . If rods 107 do not rotate but are stationary, continuous rods 106 may be formed with straight interior channels.
- extrusion nozzles or nozzles that are usable in such manner are known per se and are described for example in the documents U.S. Pat. No. 2,422,994, DE 36 01 385 A1, EP 465 946 A1, EP 1 017 527 B1, EP-A-0 340 495, EP-A-0 458 774, WO-A-92/22390 or US-A-4 779 440, the disclosed contents of which are explicitly included in the present application.
- the invention thus provides a method for manufacturing a powder-metallurgical steel.
- the method comprises the following steps: production of steel powder, preferably having a predetermined microstructure; mixing the steel powder with a binding agent to form a plastically deformable raw mixture; performing the raw mixture to form a blank having a predefined spatial form; and sintering the blank.
Abstract
The invention relates to a method for producing powder-metallurgical steel. Said method consists of the following steps: a steel powder, preferably having a predetermined structure, is produced; the steel powder is mixed with a binding agent to form a plastically deformable raw material; the raw material is initially shaped to form a blank having a predefined spatial form; and the blank is sintered.
Description
- The present invention relates to a method for producing a powder-metallurgical steel, a raw mixture for producing a steel, a powder-metallurgical steel for producing a tool, and a steel.
- In the related art, cylindrical rods for manufacturing cutting tools are produced from HSS or HSS-E by rolling or drawing.
- Previously, blanks for manufacturing tools have been produced from HSS or HSS-E by rolling or drawing the steel in repeated processing cycles. These processing operations are not only time-intensive, they are also expensive because they require sophisticated equipment and complex processes.
- In contrast to this, blanks can be made from hard metal or cermets using much simpler equipment and processes. Blanks can be produced from hard metal or cermets by extrusion and subsequent sintering. Pertinent manufacturing processes are known from example from U.S. Pat. No. 2,422,994, DE 36 01 385 A1, EP 465 946 A1, EP 1 017 527 B1, EP-A-0 340 495, EP-A-0 458 774, WO-A-92/22390 or US-A-4 779 440.
- The advantage of the extrusion process is that continuous rods can be created thereby, which are favourable for producing drilling, milling, reaming or countersinking tools, because the raw material (green body) can already be formed into the desired cylindrical shape by processing in this way, which can serve as an ideal starting point for manufacturing drilling, milling, reaming or countersinking tools.
- Extruding is also advantageous in that for example internal channels can be arranged inside the extruded rods during extrusion by simple expansions of the extruding nozzle. These inner channels may serve in the finished tool to transport coolants and/or lubricants through the interior of the tool to the cutting section of the tool.
- One object is therefore to provide the capability to obtain rods for manufacturing tools from HSS or HSS-E more simply. A further object is to provide a raw mixture with which such tools may be manufactured inexpensively.
- This object is solved with the method according to claim 1, the raw mixture according to claim 12, and with a steel produced from such a raw mixture according to claim 13 or 14.
- According to the invention, it is possible to manufacture components or semifinished goods having extremely complex shapes from tool steel very inexpensively. The method according to the invention for producing a powder-metallurgical steel, particularly a tool steel such as HSS or HSS-E steel, is characterised in that first steel powder having a predetermined microstructure is produced. A plastically deformable raw mixture is produced by mixing the steel powder with a binding agent such as wax or paraffin, which raw material may directly undergo a preforming process—preferably based on suitable selection of the particle size and/or particle size distribution of the steel powder. In this way, a blank for a steel component having a spatial form of any degree of complexity may be produced without interrupting the process.
- Possibly preceded by a separate step of expelling the binding agent, the actual creation of the microstructure takes place during sintering of the blank, that is to say the steel particles, which are preferably as close to spherical in shape as possible to assist in the extrusion process, are fused and merge closely together, yielding an extremely dense, extremely strong steel component. The microstructure inside the steel powder particles is substantially preserved, so that predictable material properties remain. It has been observed that the pressure that is generated during extrusion through a nozzle is sufficient to produce a blank constituted by a raw mixture of steel/bonding agent of sufficient density and strength following sintering process under approximately atmospheric pressure. Of course, the microstructure may be further improved by implementing a hot isostatic pressing (HIP) process in parallel with or subsequent to the extrusion.
- In order to prepare the raw mixture for the preforming process even better, it is advantageous if the steel powder undergoes processing to homogenize the geometry of the powder particles while and/or before it is mixed with the binding agent.
- In the variation of claim 4, according to which the steel powder undergoes a sorting process before mixing, so that it is presented for the mixing process in a predefined particle size and/or particle size distribution, it is possible to exercise further positive influence on the strength of the steel microstructure.
- If the steel powder is obtained by grinding or crushing steel particles, the original microstructure of the steel powder may be selected optimally, independently of the production process.
- If the steel powder is also mixed with a binding metal, such as cobalt, the material property of the manufactured steel may also be modified widely.
- In order to produce materials of particularly high density, it is advantageous if the blank undergoes a hot isostatic pressing (HIP) process before, during or after sintering.
- It is particularly advantageous if the blank undergoes thermal treatment, such as a hardening process, to control the steel microstructure during the sintering process. This is carried out by implementing a suitable temperature/time programme that may be selected as needed according to the specifications for a given material.
- With the selection of the steel powder according to the invention, it thus becomes possible to subject the plastically deformable mass to a preferably continuous extrusion process, and yet still guarantee very good microstructure densities of the steel material. In this context, the plastically deformable mass is preferably extruded through an extrusion die with a nozzle to form a continuous rod, which is then cut to the necessary length without interruption. In this way, the blanks may be manufactured very inexpensively.
- Thus, according to the invention a capability is provided for obtaining powder-metallurgical steel more easily. To this end, steel in powder form is processed in similar manner to the process used for manufacturing hard metal, with the addition of a binding agent. The powdered steel with the binding agent is then extruded and sintered.
- A further aspect of the invention consists in the provision of a raw mixture for manufacturing a steel according to claim 12.
- Advantageous refinements of the invention are described in the other dependent claims.
- According to an exemplary embodiment of the invention, a method is provided in which cobalt is also used as a binding metal.
- In a further embodiment according to the invention, a method is provided in which pressing is carried out in an extrusion die with a nozzle, so that the raw mixture may be extruded to form a continuous rod.
- According to a further embodiment of the present invention, a method is provided in which at least sections of an interior channel are arranged for transporting coolant and/or lubricant during the extrusion process.
- According to an exemplary embodiment of the invention, a method is provided in which at least sections of the interior channel are constructed in the form of a coil or as straight sections.
- In a further embodiment of the invention, a steel is provided wherein the steel may be manufactured from a raw mixture according to claim 6.
- It may thus be considered a decisive advantage of the invention that powder-metallurgical steel may be manufactured more easily and inexpensively. Besides a tool steel such as HSS-E, a high-alloy steel for example may also serve as the starter material. Or the powder may also be ground by spray forming the steel melt. The manufacture of a powder-metallurgical steel according the invention requires little production equipment and is therefore less expensive during manufacturing than the techniques of the prior art. It is also possible to achieve a higher rate of production than with the manufacturing processes according to the prior art when the method according to the invention is used to produce powder-metallurgical steel.
- Of course, the individual features may also be combined with each other to produce several advantageous effects, which extend beyond the sum of the individual effects.
- Further details and advantages of the invention will become evident with reference to the embodiments represented in the drawing. In the drawing:
-
FIG. 1 shows a diagram illustrating the steps of the method according to the invention, and -
FIG. 2 shows a nozzle for extruding a continuous powder-metallurgical rod. - It is known from the prior art to use powdered steel in the manufacture of powder-metallurgical steels. This steel is typically a high-alloy steel which may contain for example 0.46% carbon and 13% chromium. In this context, the powdered steel is compacted by repeated rolling. The resulting blocks may be used to manufacture tools, for example. Cooling channel may be provided by introducing drillholes into the partially compacted steel between the first rolling operations. Overall, this method for producing a powder-metallurgical steel requires a substantial commitment in terms of production equipment. The production method according to the prior art is also time-consuming.
-
FIG. 1 shows the process workflow according to the invention for manufacturing a powder-metallurgical steel, particularly a tool steel, such as HSS or HSS-E steel. In this process, steel powder is produced in a first process step, wherein the steel powder preferably has a previously selected microstructure, such as the microstructure of a high speed steel in the cast condition, or that of a high speed steel that has already been substantially structured. - This is followed by the addition of a binding agent such as paraffin or wax to yield a plastically deformable raw mixture, which may immediately undergo further processing in a preforming process. Dotted lines indicate a variant according to which the steel powder is also mixed with a binding metal such as cobalt.
- While it is being mixed with the binding agent and/or before mixing with the binding agent the steel powder may undergo treatment to homogenize the geometry of the powder particles—in a ball mill for example. This removes edges of the powder particles and the particles are rendered essentially spherical, thereby making the subsequent preforming process easier.
- It is also possible and advantageous to subject the steel powder to a selection process before it is mixed, so that it has a predefined particle size and/or particle size distribution when it undergoes the mixing process.
- The raw mixture obtained thereby is now preformed to produce a blank having a predetermined spatial form, preferably using an extrusion die to manufacture blanks having a structure with any degree of spatial complexity.
- The binding agent is expelled at selected temperatures during the subsequent sintering step, or also in a prior work step. This is followed by the actual sintering operation, in which the final steel microstructure is produced. The blank may undergo hot isostatic pressing (HIP) treatment before, during or after sintering. This optional method step is indicated with a dashed line in
FIG. 1 . - According to a further optional variant, the blank may undergo thermal treatment, for example a hardening process, during the sintering process to control the steel microstructure. In this context, the sintering system cycles through a predetermined, temporally controlled thermal profile at the end of which the steel has the desired microstructure quality.
- The steel powder may also be obtained by grinding or crushing steel particles.
- It has been discovered that it is possible to manufacture high-quality steel components from HSS or HSS-E steel if the plastically deformable mass is subjected to a preferably continuous extrusion process, in which the plastically deformable mass is extruded through an extrusion die equipped with a nozzle (102)—with relatively little compaction—to form a continuous rod.
- The blanks (green bodies) obtained in the form of a steel/bonding agent mixture in the extrusion step may thus be processed in similar manner to the production of hard metal or cermets. Processing with an extrusion die, which may be equipped with a nozzle for extrusion, and the subsequent sintering operation enable a powder-metallurgical steel to be manufactured simply, rapidly and advantageously. The output form as a continuous rod from the extrusion process is advantageous because the shape may already approximate the geometrical shape of a drilling, milling, countersinking or reaming tool. Steel that exists in powdered form is thus treated and processed according to the invention, for example tungsten carbides as the starting material for manufacturing hard metal (with the addition of a binding agent such as cobalt).
- Since it is possible according to the invention to carry out production using an extrusion process, internal channels may also be conformed in the extruded rod advantageously and simply, particularly the dimensions of which (diameter, circular or elliptical cross section) cannot be modified to the same degree by the subsequent processing operations, such as sintering, as may be the case in comparative terms with the processing method of the prior art, due to rolling, for example. Consequently, a higher degree of dimensional accuracy in the production of interior channels in powder-metallurgical steels may be assured.
-
FIG. 1 shows in exemplary manner a nozzle for extruding a continuous rod, wherein a raw mixture is compressed into the nozzle through aninlet aperture area 105, wherein twistedinterior channels 101 may be conformed in the compacted raw mixture, for example by continuously rotatingrods 107. Then, acontinuous rod 106 withinterior channels 101 may exit throughnozzle 102. Ifrods 107 do not rotate but are stationary,continuous rods 106 may be formed with straight interior channels. - Such extrusion nozzles or nozzles that are usable in such manner are known per se and are described for example in the documents U.S. Pat. No. 2,422,994, DE 36 01 385 A1, EP 465 946 A1, EP 1 017 527 B1, EP-A-0 340 495, EP-A-0 458 774, WO-A-92/22390 or US-A-4 779 440, the disclosed contents of which are explicitly included in the present application.
- The invention thus provides a method for manufacturing a powder-metallurgical steel. The method comprises the following steps: production of steel powder, preferably having a predetermined microstructure; mixing the steel powder with a binding agent to form a plastically deformable raw mixture; performing the raw mixture to form a blank having a predefined spatial form; and sintering the blank.
- It should be noted that the term “comprise” does not preclude other elements or process steps, just as the term “one” or “a (an)” does not preclude several elements and steps.
- The reference signs are intended solely to improve comprehension and should not be considered limiting in any way, wherein the extent of protection for the invention is reflected by the claims.
-
- 101 Interior channel
- 102 Nozzle
- 103 Inlet aperture
- 104 Inlet aperture
- 105 Mixing area
- 106 Extruded rod
- 107 Rod
Claims (15)
1. A method for producing a powder-metallurgical steel, particularly a tool steel, such as HSS or HSS-E steel, having the following process steps:
producing steel powder have a predetermined microstructure;
mixing the steel powder with a binding agent to form a plastically deformable raw mixture;
preforming the raw mixture to form a blank having a predefined spatial form; and
sintering the blank.
2. The method according to claim 1 , characterized in that the steel powder undergoes processing to homogenize the geometry of the powder particles while it is being mixed with the binding agent.
3. The method according to claim 1 , characterized in that the steel powder undergoes processing to homogenize the geometry of the powder particles before it is mixed with the binding agent.
4. The method according to claim 3 , characterized in that the steel powder undergoes a selection process before mixing so that it has a predetermined particle size and/or particle size distribution when it undergoes the mixing process.
5. The method according to claim 1 , characterized in that the steel powder is obtained by grinding or crushing steel particles.
6. The method according to claim 1 , characterized in that the steel powder is mixed with a binding agent, for example cobalt.
7. The method according to claim 1 , characterized in that the blank undergoes a hot isostatic pressing (HIP) process before, during or after sintering.
8. The method according to claim 1 , characterized in that the blank undergoes a thermal treatment, for example a hardening process, during the sintering process to control the steel microstructure.
9. The method according to claim 1 , characterized in that the plastically deformable mass undergoes a preferably continuous extrusion process, wherein the plastically deformable mass is extruded through an extrusion die with a nozzle (102) to form a continuous rod.
10. The method according to claim 9 , wherein at least sections of an interior channel are arranged for transporting coolant and/or lubricant into the rod.
11. The method according to claim 10 , wherein at least sections of the interior channel are constructed in the form of a coil or as straight sections.
12. A raw mixture for manufacturing a powder-metallurgical steel, particularly a tool steel such as HSS or HSS-E steel, comprising:
steel powder having a predetermined microstructure; and
binding agent mixed therewith in such manner that the raw mixture is suitable for extruding and subsequent sintering.
13. A powder-metallurgical steel for manufacturing a tool, wherein the steel is producible by a method according to claim 1 .
14. The steel according to claim 13 , wherein the steel is producible from a raw mixture comprising steel powder having a predetermined microstructure and binding agent mixed therewith in such manner that the raw mixture is suitable for extruding and subsequent sintering.
15. A component or semifinished product manufactured according to the method according to claim 1 or from a raw mixture comprising steel powder having a predetermined microstructure and binding agent mixed therewith in such manner that the raw mixture is suitable for extruding and subsequent sintering or from a steel producible by (1) producing steel powder have a predetermined microstructure; (2) mixing the steel powder with a binding agent to form a plastically deformable raw mixture; (3) preforming the raw mixture to form a blank having a predefined spatial form; and (4) sintering the blank.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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DE102010019599A DE102010019599A1 (en) | 2010-05-05 | 2010-05-05 | Powder metallurgical steel |
DE102010019599.5 | 2010-05-05 | ||
PCT/EP2011/057257 WO2011138422A2 (en) | 2010-05-05 | 2011-05-05 | Powder-metallurgical steel |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2011/057257 Continuation WO2011138422A2 (en) | 2010-05-05 | 2011-05-05 | Powder-metallurgical steel |
Publications (1)
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US20130136647A1 true US20130136647A1 (en) | 2013-05-30 |
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US13/666,164 Abandoned US20130136647A1 (en) | 2010-05-05 | 2012-11-01 | Powder-metallurgical steel |
Country Status (6)
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US (1) | US20130136647A1 (en) |
EP (1) | EP2566640A2 (en) |
JP (1) | JP5940058B2 (en) |
KR (1) | KR20130124152A (en) |
DE (1) | DE102010019599A1 (en) |
WO (1) | WO2011138422A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104972127A (en) * | 2015-07-02 | 2015-10-14 | 东睦新材料集团股份有限公司 | Method for preparing powder metallurgy striking block |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH055104A (en) * | 1991-06-25 | 1993-01-14 | Daido Steel Co Ltd | Extruded body of high-speed steel alloy powder and sintered product thereof |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2422994A (en) | 1944-01-03 | 1947-06-24 | Carboloy Company Inc | Twist drill |
JPS61223102A (en) * | 1985-03-29 | 1986-10-03 | Hitachi Metals Ltd | Production of metallic sintered member having hollow hole |
DE3600681A1 (en) | 1985-10-31 | 1987-05-07 | Krupp Gmbh | HARD METAL OR CERAMIC DRILL BLANK AND METHOD AND EXTRACTION TOOL FOR ITS PRODUCTION |
DE3601385A1 (en) | 1986-01-18 | 1987-07-23 | Krupp Gmbh | METHOD FOR PRODUCING SINTER BODIES WITH INNER CHANNELS, EXTRACTION TOOL FOR IMPLEMENTING THE METHOD, AND DRILLING TOOL |
DE3814687A1 (en) | 1988-04-30 | 1989-11-09 | Krupp Widia Gmbh | EXTRACTION TOOL |
JPH0317203A (en) * | 1989-06-15 | 1991-01-25 | Kawasaki Steel Corp | Manufacture of powder metallurgical product |
AT398286B (en) | 1990-05-22 | 1994-11-25 | Boehlerit Gmbh & Co Kg | HARD METAL OR CERAMIC BLANK AND METHOD AND TOOL FOR PRODUCING THE SAME |
DE4120165C2 (en) * | 1990-07-05 | 1995-01-26 | Friedrichs Konrad Kg | Extrusion tool for producing a hard metal or ceramic rod |
JPH04235203A (en) * | 1991-01-08 | 1992-08-24 | Hitachi Metals Ltd | Manufacture of ejector sleeve |
DE4120166C2 (en) | 1991-06-19 | 1994-10-06 | Friedrichs Konrad Kg | Extrusion tool for producing a hard metal or ceramic rod with twisted inner holes |
DE19644447C2 (en) | 1996-10-25 | 2001-10-18 | Friedrichs Konrad Kg | Method and device for the continuous extrusion of rods made of plastic raw material equipped with a helical inner channel |
-
2010
- 2010-05-05 DE DE102010019599A patent/DE102010019599A1/en not_active Withdrawn
-
2011
- 2011-05-05 KR KR1020127030327A patent/KR20130124152A/en not_active Application Discontinuation
- 2011-05-05 EP EP11719228A patent/EP2566640A2/en not_active Withdrawn
- 2011-05-05 WO PCT/EP2011/057257 patent/WO2011138422A2/en active Application Filing
- 2011-05-05 JP JP2013508514A patent/JP5940058B2/en active Active
-
2012
- 2012-11-01 US US13/666,164 patent/US20130136647A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH055104A (en) * | 1991-06-25 | 1993-01-14 | Daido Steel Co Ltd | Extruded body of high-speed steel alloy powder and sintered product thereof |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104972127A (en) * | 2015-07-02 | 2015-10-14 | 东睦新材料集团股份有限公司 | Method for preparing powder metallurgy striking block |
Also Published As
Publication number | Publication date |
---|---|
JP5940058B2 (en) | 2016-06-29 |
KR20130124152A (en) | 2013-11-13 |
WO2011138422A2 (en) | 2011-11-10 |
EP2566640A2 (en) | 2013-03-13 |
DE102010019599A1 (en) | 2011-11-10 |
JP2013528705A (en) | 2013-07-11 |
WO2011138422A3 (en) | 2012-03-15 |
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