WO2018079160A1 - Method for producing mixed powder for powder metallurgy, and equipment for producing mixed powder for powder metallurgy - Google Patents
Method for producing mixed powder for powder metallurgy, and equipment for producing mixed powder for powder metallurgy Download PDFInfo
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- the present invention relates to a method for producing a powder mixture for powder metallurgy and a facility for producing a powder mixture for powder metallurgy.
- Powders used in powder metallurgy technology are iron-based powders that are basic components, powders containing alloy components (hereinafter referred to as alloy powders), and powders for alloys thereof Is mixed with a binder (hereinafter referred to as a binder) that adheres to the surface of the iron-based powder.
- alloy powders powders containing alloy components
- a binder powders for alloys thereof Is mixed with a binder (hereinafter referred to as a binder) that adheres to the surface of the iron-based powder.
- auxiliary materials such as solid lubricant, machinability improving material powder, slidability improving material powder, and fluidity improving material powder are added as required are also used.
- Patent Document 1 an alloy powder, a machinability improving powder, and a solid lubricant are added to an iron-based powder and mixed first, then a binder is added and secondarily mixed while raising the temperature, and further cooled.
- a method of performing tertiary mixing has been proposed.
- Patent Document 2 proposes a method of mixing raw materials obtained by adding alloy powder, binder, and auxiliary raw materials to iron-based powder by primary mixing and secondary mixing.
- the raw material is stirred while being heated to a temperature equal to or higher than the melting point of the binder, and then stirred while being held at the temperature, and further while being cooled from the temperature.
- the secondary mixing the mixed powder obtained by the primary mixing is stirred while cooling.
- heating and cooling are performed by a single mixing device in order to continuously perform heating and cooling in the primary mixing.
- the outer periphery of the mixing and stirring apparatus is a double wall, and high temperature steam or oil is flowed between the double walls during heating, and low temperature water or oil is flowed during cooling.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a manufacturing method and a manufacturing facility for a mixed powder for powder metallurgy that are high in safety and excellent in production efficiency.
- a method for producing a mixed powder for powder metallurgy comprising: A primary mixing and stirring step of mixing and stirring a raw material composed of an iron-based powder, an alloy powder, a binder, and auxiliary materials using a first mixing and stirring device including a heating unit; A secondary mixing and stirring step in which the raw material after the primary mixing and stirring step is mixed and stirred using a second mixing and stirring device provided with a cooling means different from the first mixing and stirring device; A tertiary mixing and stirring step of mixing and stirring the raw material after the secondary mixing and stirring step using a third mixing and stirring device different from the first mixing and stirring device and the second mixing and stirring device.
- the raw material is heated to a temperature T 1 higher than the melting point T m of the binder, wherein in the second mixing and stirring step, the raw material is cooled to the T lower than the m temperature T 2, the production method of the mixed powder for powder metallurgy.
- auxiliary material is one or more selected from the group consisting of a solid lubricant, a machinability improving material powder, a slidability improving material powder, and a fluidity improving material powder. Manufacturing method of mixed powder.
- the processing time of the primary mixing and stirring step is the same as the processing time of the secondary mixing and stirring step, 4.
- a facility for producing mixed powder for powder metallurgy A first mixing and stirring device including heating means for mixing and stirring the raw material composed of iron-based powder, alloy powder, binder, and auxiliary materials; A second mixing and stirring device comprising a cooling means for further mixing the raw materials mixed and stirred by the first mixing and stirring device; A facility for producing mixed powder for powder metallurgy, comprising a third mixing and stirring device for further mixing the raw materials mixed and stirred by the second mixing and stirring device.
- the manufacturing equipment of the mixed powder for powder metallurgy of said 5 provided with the storage tank for storing the raw material mixed and stirred by the 2nd mixing and stirring apparatus for several batches.
- a mixed powder for powder metallurgy can be produced safely and efficiently by simple means.
- FIG. 1 is a schematic diagram showing a flow of a method for producing a powder mixture for powder metallurgy according to an embodiment of the present invention.
- the mixing and stirring of the raw materials includes a primary mixing and stirring step using the first mixing and stirring device 10, a secondary mixing and stirring step using the second mixing and stirring device 20, and a third mixing and stirring device. This is carried out by three steps of the tertiary mixing and stirring step using 30. Finally, a mixed powder for powder metallurgy is obtained.
- the powder after the secondary mixing and stirring step can optionally be subjected to the tertiary mixing and stirring step after being temporarily accumulated using the storage tank 40 or the like.
- the raw material to be used and the contents of the process in each step will be specifically described.
- a raw material comprising an iron-based powder, an alloy powder, a binder, and auxiliary materials is used.
- the components of the raw material will be described first.
- any iron-based powder can be used without any particular limitation.
- the iron-based powder include iron powder (so-called pure iron powder) and alloy steel powder.
- the method for producing the iron-based powder is not limited, and for example, an atomized iron-based powder produced by an atomizing method or a reduced iron-based powder produced by a reducing method (reduced iron- iron-based powder produced by any method such as based powder).
- a water atomizing method can be used as the atomizing method.
- the “iron-based powder” refers to a metal powder having an Fe content of 50% by mass or more, and the “iron powder” refers to a powder composed of Fe and inevitable impurities.
- the particle size of the iron-based powder is not particularly limited and may be any value, but is preferably 60 mesh (250 ⁇ m) or less.
- the apparent density of the iron-based powder is not particularly limited and can be any value, but it is preferably 2.3 to 3.3 Mg / m 3 .
- the alloy powder is not particularly limited, and any powder containing an alloy element can be used.
- the alloy powder include carbon powder such as graphite powder, non-ferrous metal powder such as Cu powder, Mo powder and Ni powder, and metal oxide powder such as cuprous oxide powder. Only one type of the alloy powder can be used, but two or more types can be used in combination.
- the alloy powder is fixed to the surface of the iron-based powder by a binder.
- the binder is not particularly limited, and any binder can be used as long as it can bind the iron-based powder and the alloy powder.
- the binder for example, one or more selected from the group consisting of fatty acids, fatty acid amides, fatty acid bisamides, and metal soaps can be used.
- any auxiliary raw material can be used.
- the auxiliary material is preferably one or more selected from the group consisting of solid lubricant, machinability improving material powder, slidability improving material powder, and fluidity improving material powder.
- the solid lubricant is not particularly limited, and any solid lubricant can be used.
- the solid lubricant it is preferable to use at least one of zinc stearate and ethylene bisamide.
- the machinability improving material powder is not particularly limited, and any machinability improving material powder can be used.
- MnS powder is preferably used as the machinability improving material powder.
- the sliding property improving material powder is not particularly limited, and any sliding property improving material powder can be used.
- the sliding property improving material powder it is preferable to use at least one of S (sulfur) powder and Mo 2 S powder.
- the fluidity improving material powder is not particularly limited, and any fluidity improving material powder can be used.
- the fluidity improving material powder it is preferable to use at least one of SiO 2 powder and carbon black.
- the raw material is charged into the first mixing and stirring device 10 and mixed and stirred.
- the first mixing and stirring device 10 any device can be used as long as it is a mixing and stirring device provided with heating means.
- a high-speed bottom stirring mixer is preferably used, and in particular, a Henschel mixer is preferably used.
- the high-speed bottom agitating mixer agitates and mixes the powder in the mixing tank by rotating the rotating blades 11 provided at the bottom of the mixing tank around the rotating shaft 12. Is.
- the first mixing and stirring device 10 needs to have a heating means for heating the raw material.
- the heating means is not particularly limited, and any heating means can be used as long as it can heat the charged raw material.
- the raw material in the mixing tank can be heated by circulating the heat medium through the double structure 13 with the outer periphery of the first mixing and stirring device 10 as a double wall.
- the heat medium for example, steam or oil can be used.
- a heater can also be used as the heating means.
- an electric heater can be used as the heater.
- a plurality of heating means can be used in combination.
- the first mixing and stirring device preferably includes a heating unit and does not include a cooling unit.
- the raw material is heated to a temperature T 1 higher than the melting point T m of the binder contained in the raw material.
- T 1 the melting point of the binder contained in the raw material.
- the heating procedure is not particularly limited, but from the viewpoint of uniform adhesion, it is preferable that the temperature is raised to temperature T 1 while stirring, and then further stirred while maintaining the temperature T 1 .
- the primary mixing and stirring is stopped, and the powder in the first mixing and stirring device 10 is discharged.
- the discharged powder is subjected to the next secondary mixing and stirring step.
- the raw material powder that has been mixed and stirred in the primary mixing and stirring step is charged into a second mixing and stirring device that is provided with a cooling means different from the first mixing and stirring device.
- a second mixing and stirring device any mixing stirring device provided with a cooling means can be used.
- the second mixing and stirring device 20 it is preferable to use a high-speed bottom stirring mixer, and it is particularly preferable to use a Henschel mixer that has a strong stirring force and can increase the cooling rate.
- the second mixing and stirring device 20 needs to have a cooling means for cooling the raw material.
- the cooling means is not particularly limited, and any means can be used as long as it can cool the powder in the second mixing and stirring device 20.
- the outer periphery of the second mixing and stirring device 20 is used as a double wall, and the cooling medium is circulated through the double structure portion 23 to cool the raw material in the mixing tank. Can do.
- low-temperature water or oil can be used as the cooling medium.
- the second mixing and stirring apparatus preferably includes a cooling unit and does not include a heating unit.
- the raw material is cooled to a temperature T 2 lower than the melting point T m of the binder contained in the raw material.
- T 2 the melting point of the binder contained in the raw material.
- the cooling method is not particularly limited, but it is preferable to cool to temperature T 2 while stirring.
- the temperature T 2 can be any temperature as long as it is lower than the melting point T m of the binder, but is preferably room temperature.
- heating and cooling are performed by separate mixing and stirring devices such that only heating is performed in the primary mixing and stirring step and only cooling is performed in the secondary mixing and stirring step.
- the contaminated mixed powder cannot be made into a product, and production is not possible during the repair period of cracks, reducing production efficiency.
- the occurrence of such a problem can be prevented.
- the first mixing and stirring device 10 does not perform cooling, the temperature of the double structure portion 13 of the mixing and stirring device does not decrease even when mixing and stirring the next batch, and the vicinity of the heating temperature T 1 Therefore, the temperature increase time in the next batch can be shortened, and energy loss can be suppressed.
- the secondary mixing and stirring is stopped, and the powder in the second mixing and stirring device 20 is discharged.
- the discharged powder is subjected to the next tertiary mixing and stirring step.
- the raw material powder that has been mixed and stirred in the secondary mixing and stirring step is charged into a third mixing and stirring device 30 that is different from the first mixing and stirring device and the second mixing and stirring device.
- the powder can be temporarily stored in a storage means such as a storage tank 40 before being charged into the third mixing device, and the description of this case will be described later.
- the third mixing and stirring device 30 any device can be used, but it is preferable to use a W cone type mixer.
- the final mixed powder for powder metallurgy can be obtained by performing stirring and mixing using the third mixing and stirring device 30.
- the third mixing and stirring device 30 can be a mixing and stirring device that does not include heating means and cooling means.
- an additional auxiliary material can be added.
- the additional auxiliary material one or more selected from the group consisting of a solid lubricant, a machinability improving material powder, a slidability improving material powder, and a fluidity improving material powder can be used.
- the additional auxiliary material may be the same as or different from the auxiliary material included in the raw material used in the primary mixing and stirring step.
- a batch composed of a primary mixing and stirring step and a secondary mixing and stirring step are separately performed in a plurality of batches, and then the powder obtained in each of the plurality of batches is collected and the tertiary mixing is performed. It can use for a stirring process.
- multiple batches of powder can be batch mixed and stirred at one time, so that multiple batches of powder can be made into one lot of mixed powder for powder metallurgy. The number can be reduced, and daily management such as quality control can be made more efficient.
- the powder discharged from the second mixing and stirring device 20 is added to the third mixing and stirring device 30 as needed.
- it can also be stored in storage means such as a storage tank 40. Accordingly, the primary mixing and stirring step and the secondary mixing and stirring step can be performed without being limited even while the third mixing and stirring device 30 is mixing and stirring the powder of the previous lot. .
- the storage capacity V S and the processing capacity V 3 of the third mixing and stirring apparatus are 2 or more of the processing volume V 2 of the mixing and stirring apparatus 2 is preferable.
- the processing times of the primary mixing and stirring step and the secondary mixing and stirring step in order to maximize the efficiency in industrial production, it is preferable to equalize the processing times of the primary mixing and stirring step and the secondary mixing and stirring step. Further, in the tertiary mixing stirring process, while the mixed powder that has been subjected to the secondary mixing stirring process is being stored in the storage tank 13, the process is completed so as not to cause congestion in the primary mixing stirring process and the secondary mixing stirring process. It is desirable to design. For example, as described above, when the powders obtained in a plurality of batches of the secondary mixing and stirring step are collectively used for the tertiary mixing and stirring step, the processing time of the tertiary mixing and stirring step is set to the processing of the plurality of batches. It is preferable that the time is not longer than the time.
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Abstract
Provided are a method and equipment for producing a mixed powder for powder metallurgy, which ensure high safety and have excellent production efficiency. The method for producing a mixed powder for powder metallurgy comprises: a primary mixing/stirring step for mixing and stirring a raw material including an iron-based powder, a powder for an alloy, a binder, and an auxiliary raw material using a first mixing/stirring device provided with a heating means; a secondary mixing/stirring step for mixing and stirring the raw material after the primary mixing/stirring step using a second mixing/stirring device which is different from the first mixing/stirring device and which is provided with a cooling means; and a tertiary mixing/stirring step for mixing and stirring the raw material after the secondary mixing/stirring step using a third mixing/stirring device which is different from the first mixing/stirring device and the second mixing/stirring device, wherein the raw material is heated up to a temperature T1 higher than a melting point Tm of the binder in the primary mixing/stirring step, and the raw material is cooled down to a temperature T2 lower than Tm in the secondary mixing/stirring step.
Description
本発明は、粉末冶金用混合粉末の製造方法および粉末冶金用混合粉末の製造設備に関する。
The present invention relates to a method for producing a powder mixture for powder metallurgy and a facility for producing a powder mixture for powder metallurgy.
粉末冶金技術で使用する粉末（以下、「粉末冶金用混合粉末」という）は、基本成分である鉄基粉末と、合金成分を含有する粉末（以下、合金用粉末という）と、その合金用粉末を鉄基粉末の表面に固着させるバインダー（以下、結合剤という）とを混合して製造される。また、必要に応じて固体潤滑剤、切削性改善材粉、摺動性改善材粉、流動性改善材粉などの副原料を添加した粉末冶金用混合粉末も使用されている。
Powders used in powder metallurgy technology (hereinafter referred to as “mixed powders for powder metallurgy”) are iron-based powders that are basic components, powders containing alloy components (hereinafter referred to as alloy powders), and powders for alloys thereof Is mixed with a binder (hereinafter referred to as a binder) that adheres to the surface of the iron-based powder. In addition, mixed powders for powder metallurgy to which auxiliary materials such as solid lubricant, machinability improving material powder, slidability improving material powder, and fluidity improving material powder are added as required are also used.
上記粉末冶金用混合粉末の製造においては、鉄基粉末の表面に結合剤を介して合金用粉末を固着する必要がある。また、副原料を用いる場合には、粉末冶金用混合粉末全体に副原料が均一に混合される必要がある。そこで、結合剤による固着と均一な混合を達成するために種々の混合攪拌方法が検討されている。
In the production of the powder mixture for powder metallurgy, it is necessary to adhere the alloy powder to the surface of the iron-based powder through a binder. Moreover, when using an auxiliary material, it is necessary to add an auxiliary material uniformly to the whole mixed powder for powder metallurgy. Therefore, various mixing and stirring methods have been studied in order to achieve fixing with the binder and uniform mixing.
例えば、特許文献１では、鉄基粉末に合金用粉末と切削性改善粉と固体潤滑剤を添加して１次混合し、次いで結合剤を添加して昇温しながら２次混合し、さらに冷却しながら３次混合を行う方法が提案されている。
For example, in Patent Document 1, an alloy powder, a machinability improving powder, and a solid lubricant are added to an iron-based powder and mixed first, then a binder is added and secondarily mixed while raising the temperature, and further cooled. However, a method of performing tertiary mixing has been proposed.
また、特許文献２では、合金用粉末、結合剤、および副原料を鉄基粉末に添加して得た原料を、１次混合および２次混合により混合する方法が提案されている。前記１次混合では、前記原料を、前記結合剤の融点以上の温度まで昇温しながら撹拌した後、前記温度に保持して撹拌し、さらに前記温度から冷却しながら撹拌する。そして前記２次混合では、１次混合で得られた混合粉末を冷却しながら撹拌する。
Further, Patent Document 2 proposes a method of mixing raw materials obtained by adding alloy powder, binder, and auxiliary raw materials to iron-based powder by primary mixing and secondary mixing. In the primary mixing, the raw material is stirred while being heated to a temperature equal to or higher than the melting point of the binder, and then stirred while being held at the temperature, and further while being cooled from the temperature. In the secondary mixing, the mixed powder obtained by the primary mixing is stirred while cooling.
しかし、特許文献１で提案されている方法では、１次混合、２次混合、および３次混合を１台の混合装置で行っている。そのため、鉄基粉末や合金用粉末等の素材粉を混合装置に装入してから最終的な粉末冶金用混合粉末を得るまでの間、長時間に渡って混合装置が占有され、生産性が低い。
However, in the method proposed in Patent Document 1, primary mixing, secondary mixing, and tertiary mixing are performed by a single mixing device. Therefore, the mixing device is occupied over a long period of time until the final mixed powder for powder metallurgy is obtained after the raw material powder such as iron-based powder and alloy powder is charged into the mixing device, and productivity is increased. Low.
また、特許文献２で提案されている方法では、１次混合における加熱と冷却を連続して行うために、１台の混合装置で加熱と冷却を行っている。具体的には、特許文献２では、混合攪拌装置の外周を二重壁とし、該二重壁の間に、加熱時には高温の蒸気やオイルを、冷却時には低温の水またはオイルを流すとしている。
Further, in the method proposed in Patent Document 2, heating and cooling are performed by a single mixing device in order to continuously perform heating and cooling in the primary mixing. Specifically, in Patent Document 2, the outer periphery of the mixing and stirring apparatus is a double wall, and high temperature steam or oil is flowed between the double walls during heating, and low temperature water or oil is flowed during cooling.
しかし、特許文献２に記載されているように１台の混合機で加熱と冷却を行った場合、混合装置の二重壁を構成する部材が熱媒体との接触により、加熱時には熱膨張し、冷却時には収縮する。このような混合装置は一般的に金属材料を溶接して作成されているため、その角部や溶接部に前記膨張と収縮による応力が集中する。その結果、前記方法による粉末冶金用混合粉末の製造を繰り返し行ううちに、金属疲労が蓄積し、いずれは亀裂が生じる。したがって、混合装置の寿命が短くなることに加え、高温の蒸気やオイルが漏洩することで作業者が危険にさらされるおそれがある。
However, when heating and cooling is performed with one mixer as described in Patent Document 2, the members constituting the double wall of the mixing device are in thermal expansion during heating due to contact with the heat medium, Shrinks when cooled. Since such a mixing apparatus is generally made by welding a metal material, the stress due to the expansion and contraction concentrates on the corners and welds. As a result, as the mixed powder for powder metallurgy is repeatedly manufactured by the above method, metal fatigue accumulates and eventually cracks occur. Therefore, in addition to shortening the life of the mixing apparatus, there is a risk that the worker may be exposed to danger due to leakage of high-temperature steam or oil.
さらに、特許文献２に記載されている方法では、１台の混合装置で加熱と冷却を行うため、１次混合が終わった時点で混合装置は常温まで冷却された状態となっている。その結果、次のバッチにおいて１次混合を行う際には、再度、常温から結合剤の融点以上の温度まで加熱する必要があり、加熱に長時間を要する。そのため、生産効率が低いことに加え、エネルギーのロスも大きい。
Furthermore, in the method described in Patent Document 2, since heating and cooling are performed with one mixing device, the mixing device is cooled to room temperature when the primary mixing is completed. As a result, when primary mixing is performed in the next batch, it is necessary to heat again from room temperature to a temperature equal to or higher than the melting point of the binder, and heating takes a long time. Therefore, in addition to low production efficiency, energy loss is also large.
本発明は、上記事情に鑑みてなされたものであり、安全性が高く、かつ生産効率に優れる、粉末冶金用混合粉末の製造方法および製造設備を提供することを目的とする。
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a manufacturing method and a manufacturing facility for a mixed powder for powder metallurgy that are high in safety and excellent in production efficiency.
すなわち、本発明の要旨構成は、次のとおりである。
１．粉末冶金用混合粉末の製造方法であって、
鉄基粉末、合金用粉末、結合剤、および副原料からなる原料を、加熱手段を備える第１の混合攪拌装置を用いて混合攪拌する１次混合攪拌工程と、
前記１次混合攪拌工程後の前記原料を、前記第１の混合攪拌装置とは別の、冷却手段を備える第２の混合攪拌装置を用いて混合攪拌する２次混合攪拌工程と、
前記２次混合攪拌工程後の前記原料を、前記第１の混合攪拌装置および前記第２の混合攪拌装置とは別の、第３の混合攪拌装置を用いて混合攪拌する３次混合攪拌工程を有し、
前記１次混合攪拌工程においては、前記原料が前記結合剤の融点Ｔmより高い温度Ｔ1まで加熱され、
前記２次混合攪拌工程においては、前記原料が前記Ｔmより低い温度Ｔ2まで冷却される、粉末冶金用混合粉末の製造方法。 That is, the gist configuration of the present invention is as follows.
1. A method for producing a mixed powder for powder metallurgy, comprising:
A primary mixing and stirring step of mixing and stirring a raw material composed of an iron-based powder, an alloy powder, a binder, and auxiliary materials using a first mixing and stirring device including a heating unit;
A secondary mixing and stirring step in which the raw material after the primary mixing and stirring step is mixed and stirred using a second mixing and stirring device provided with a cooling means different from the first mixing and stirring device;
A tertiary mixing and stirring step of mixing and stirring the raw material after the secondary mixing and stirring step using a third mixing and stirring device different from the first mixing and stirring device and the second mixing and stirring device. Have
In the primary mixing and stirring step, the raw material is heated to a temperature T 1 higher than the melting point T m of the binder,
Wherein in the second mixing and stirring step, the raw material is cooled to the T lower than the m temperature T 2, the production method of the mixed powder for powder metallurgy.
１．粉末冶金用混合粉末の製造方法であって、
鉄基粉末、合金用粉末、結合剤、および副原料からなる原料を、加熱手段を備える第１の混合攪拌装置を用いて混合攪拌する１次混合攪拌工程と、
前記１次混合攪拌工程後の前記原料を、前記第１の混合攪拌装置とは別の、冷却手段を備える第２の混合攪拌装置を用いて混合攪拌する２次混合攪拌工程と、
前記２次混合攪拌工程後の前記原料を、前記第１の混合攪拌装置および前記第２の混合攪拌装置とは別の、第３の混合攪拌装置を用いて混合攪拌する３次混合攪拌工程を有し、
前記１次混合攪拌工程においては、前記原料が前記結合剤の融点Ｔmより高い温度Ｔ1まで加熱され、
前記２次混合攪拌工程においては、前記原料が前記Ｔmより低い温度Ｔ2まで冷却される、粉末冶金用混合粉末の製造方法。 That is, the gist configuration of the present invention is as follows.
1. A method for producing a mixed powder for powder metallurgy, comprising:
A primary mixing and stirring step of mixing and stirring a raw material composed of an iron-based powder, an alloy powder, a binder, and auxiliary materials using a first mixing and stirring device including a heating unit;
A secondary mixing and stirring step in which the raw material after the primary mixing and stirring step is mixed and stirred using a second mixing and stirring device provided with a cooling means different from the first mixing and stirring device;
A tertiary mixing and stirring step of mixing and stirring the raw material after the secondary mixing and stirring step using a third mixing and stirring device different from the first mixing and stirring device and the second mixing and stirring device. Have
In the primary mixing and stirring step, the raw material is heated to a temperature T 1 higher than the melting point T m of the binder,
Wherein in the second mixing and stirring step, the raw material is cooled to the T lower than the m temperature T 2, the production method of the mixed powder for powder metallurgy.
２．前記副原料が、固体潤滑剤、切削性改善材粉、摺動性改善材粉、および流動性改善材粉からなる群より選択される１または２以上である、上記１に記載の粉末冶金用混合粉末の製造方法。
2. 2. The powder metallurgy according to 1, wherein the auxiliary material is one or more selected from the group consisting of a solid lubricant, a machinability improving material powder, a slidability improving material powder, and a fluidity improving material powder. Manufacturing method of mixed powder.
３．前記１次混合攪拌工程と前記２次混合攪拌工程からなるバッチを複数バッチ行った後、
前記複数バッチのそれぞれで得られた粉末をまとめて前記３次混合攪拌工程に供する、上記１または２に記載の粉末冶金用混合粉末の製造方法。 3. After performing a plurality of batches consisting of the primary mixing and stirring step and the secondary mixing and stirring step,
3. The method for producing a mixed powder for powder metallurgy according to 1 or 2 above, wherein the powders obtained in each of the plurality of batches are collectively used in the tertiary mixing and stirring step.
前記複数バッチのそれぞれで得られた粉末をまとめて前記３次混合攪拌工程に供する、上記１または２に記載の粉末冶金用混合粉末の製造方法。 3. After performing a plurality of batches consisting of the primary mixing and stirring step and the secondary mixing and stirring step,
3. The method for producing a mixed powder for powder metallurgy according to 1 or 2 above, wherein the powders obtained in each of the plurality of batches are collectively used in the tertiary mixing and stirring step.
４．前記１次混合攪拌工程の処理時間と前記２次混合攪拌工程の処理時間が同じであり、
前記３次混合攪拌工程の処理時間が、前記複数バッチの処理時間以下である、上記３に記載の粉末冶金用混合粉末の製造方法。 4). The processing time of the primary mixing and stirring step is the same as the processing time of the secondary mixing and stirring step,
4. The method for producing a mixed powder for powder metallurgy according to 3 above, wherein the processing time of the tertiary mixing and stirring step is equal to or shorter than the processing time of the plurality of batches.
前記３次混合攪拌工程の処理時間が、前記複数バッチの処理時間以下である、上記３に記載の粉末冶金用混合粉末の製造方法。 4). The processing time of the primary mixing and stirring step is the same as the processing time of the secondary mixing and stirring step,
4. The method for producing a mixed powder for powder metallurgy according to 3 above, wherein the processing time of the tertiary mixing and stirring step is equal to or shorter than the processing time of the plurality of batches.
５．粉末冶金用混合粉末の製造設備であって、
鉄基粉末、合金用粉末、結合剤、および副原料からなる原料を混合攪拌するための、加熱手段を備える第１の混合攪拌装置と、
前記第１の混合攪拌装置で混合攪拌された原料をさらに混合するための、冷却手段を備える第２の混合攪拌装置と、
前記第２の混合攪拌装置で混合攪拌された原料をさらに混合するための、第３の混合攪拌装置を備える、粉末冶金用混合粉末の製造設備。 5). A facility for producing mixed powder for powder metallurgy,
A first mixing and stirring device including heating means for mixing and stirring the raw material composed of iron-based powder, alloy powder, binder, and auxiliary materials;
A second mixing and stirring device comprising a cooling means for further mixing the raw materials mixed and stirred by the first mixing and stirring device;
A facility for producing mixed powder for powder metallurgy, comprising a third mixing and stirring device for further mixing the raw materials mixed and stirred by the second mixing and stirring device.
鉄基粉末、合金用粉末、結合剤、および副原料からなる原料を混合攪拌するための、加熱手段を備える第１の混合攪拌装置と、
前記第１の混合攪拌装置で混合攪拌された原料をさらに混合するための、冷却手段を備える第２の混合攪拌装置と、
前記第２の混合攪拌装置で混合攪拌された原料をさらに混合するための、第３の混合攪拌装置を備える、粉末冶金用混合粉末の製造設備。 5). A facility for producing mixed powder for powder metallurgy,
A first mixing and stirring device including heating means for mixing and stirring the raw material composed of iron-based powder, alloy powder, binder, and auxiliary materials;
A second mixing and stirring device comprising a cooling means for further mixing the raw materials mixed and stirred by the first mixing and stirring device;
A facility for producing mixed powder for powder metallurgy, comprising a third mixing and stirring device for further mixing the raw materials mixed and stirred by the second mixing and stirring device.
６．さらに、第２の混合攪拌装置で混合攪拌された原料を複数バッチ分貯めておくための貯槽を備える、上記５に記載の粉末冶金用混合粉末の製造設備。
6). Furthermore, the manufacturing equipment of the mixed powder for powder metallurgy of said 5 provided with the storage tank for storing the raw material mixed and stirred by the 2nd mixing and stirring apparatus for several batches.
７．前記貯槽の容量ＶSおよび前記第３の混合攪拌装置の処理容量Ｖ3が、前記第２の混合攪拌装置の処理容量Ｖ2の２倍以上である、上記６に記載の粉末冶金用混合粉末の製造設備。
7). 7. The mixed powder for powder metallurgy according to 6 above, wherein a capacity V S of the storage tank and a processing capacity V 3 of the third mixing and stirring device are at least twice as large as a processing capacity V 2 of the second mixing and stirring device. Manufacturing equipment.
本発明によれば、簡便な手段で、安全かつ効率的に粉末冶金用混合粉末を製造することができる。
According to the present invention, a mixed powder for powder metallurgy can be produced safely and efficiently by simple means.
次に、本発明を実施する方法について具体的に説明する。なお、以下の説明は、本発明の好適な一実施態様を示すものであり、本発明は、以下の説明によって何ら限定されるものではない。
Next, a method for carrying out the present invention will be specifically described. The following description shows a preferred embodiment of the present invention, and the present invention is not limited by the following description.
図１は、本発明の一実施形態における粉末冶金用混合粉末の製造方法のフローを示す模式図である。本発明においては、原料の混合攪拌が、第１の混合攪拌装置１０を用いた１次混合攪拌工程、第２の混合攪拌装置２０を用いた２次混合攪拌工程、および第３の混合攪拌装置３０を用いた３次混合攪拌工程の３工程により行われる。そして最終的に、粉末冶金用混合粉末が得られる。また、２次混合攪拌工程後の粉末は、任意に、貯槽４０などを用いて一時的に蓄積した後に３次混合攪拌工程に供することもできる。以下、使用する原料、および各工程における処理の内容について、具体的に説明する。
FIG. 1 is a schematic diagram showing a flow of a method for producing a powder mixture for powder metallurgy according to an embodiment of the present invention. In the present invention, the mixing and stirring of the raw materials includes a primary mixing and stirring step using the first mixing and stirring device 10, a secondary mixing and stirring step using the second mixing and stirring device 20, and a third mixing and stirring device. This is carried out by three steps of the tertiary mixing and stirring step using 30. Finally, a mixed powder for powder metallurgy is obtained. In addition, the powder after the secondary mixing and stirring step can optionally be subjected to the tertiary mixing and stirring step after being temporarily accumulated using the storage tank 40 or the like. Hereinafter, the raw material to be used and the contents of the process in each step will be specifically described.
本発明の一実施形態における粉末冶金用混合粉末の製造方法においては、鉄基粉末、合金用粉末、結合剤、および副原料からなる原料が用いられる。以下、前記原料の構成成分についてまず説明する。
In the method for producing a powder mixture for powder metallurgy according to an embodiment of the present invention, a raw material comprising an iron-based powder, an alloy powder, a binder, and auxiliary materials is used. Hereinafter, the components of the raw material will be described first.
［鉄基粉末］
上記鉄基粉末としては、特に限定されることなく、任意のものを用いることができる。前記鉄基粉末の例としては、鉄粉（いわゆる純鉄粉）や合金鋼粉が挙げられる。また、前記鉄基粉末の製造方法についても限定されず、例えば、アトマイズ法によって製造されるアトマイズ鉄基粉末（atomized iron-based powder）や、還元法によって製造される還元鉄基粉末（reduced iron-based powder）など、任意の方法で製造された鉄基粉末を用いることができる。前記アトマイズ法としては、例えば、水アトマイズ法を用いることができる。なお、「鉄基粉末」とは、Ｆｅ含有量が５０質量％以上である金属粉末を指し、「鉄粉」とは、Ｆｅおよび不可避不純物からなる粉末を指すものとする。 [Iron-based powder]
Any iron-based powder can be used without any particular limitation. Examples of the iron-based powder include iron powder (so-called pure iron powder) and alloy steel powder. Also, the method for producing the iron-based powder is not limited, and for example, an atomized iron-based powder produced by an atomizing method or a reduced iron-based powder produced by a reducing method (reduced iron- iron-based powder produced by any method such as based powder). As the atomizing method, for example, a water atomizing method can be used. The “iron-based powder” refers to a metal powder having an Fe content of 50% by mass or more, and the “iron powder” refers to a powder composed of Fe and inevitable impurities.
上記鉄基粉末としては、特に限定されることなく、任意のものを用いることができる。前記鉄基粉末の例としては、鉄粉（いわゆる純鉄粉）や合金鋼粉が挙げられる。また、前記鉄基粉末の製造方法についても限定されず、例えば、アトマイズ法によって製造されるアトマイズ鉄基粉末（atomized iron-based powder）や、還元法によって製造される還元鉄基粉末（reduced iron-based powder）など、任意の方法で製造された鉄基粉末を用いることができる。前記アトマイズ法としては、例えば、水アトマイズ法を用いることができる。なお、「鉄基粉末」とは、Ｆｅ含有量が５０質量％以上である金属粉末を指し、「鉄粉」とは、Ｆｅおよび不可避不純物からなる粉末を指すものとする。 [Iron-based powder]
Any iron-based powder can be used without any particular limitation. Examples of the iron-based powder include iron powder (so-called pure iron powder) and alloy steel powder. Also, the method for producing the iron-based powder is not limited, and for example, an atomized iron-based powder produced by an atomizing method or a reduced iron-based powder produced by a reducing method (reduced iron- iron-based powder produced by any method such as based powder). As the atomizing method, for example, a water atomizing method can be used. The “iron-based powder” refers to a metal powder having an Fe content of 50% by mass or more, and the “iron powder” refers to a powder composed of Fe and inevitable impurities.
前記鉄基粉末の粒径は、特に限定されず任意の値とすることができるが、６０メッシュ（２５０μｍ）以下とすることが好ましい。また、前記鉄基粉末の見掛密度は、特に限定されず任意の値とすることができるが、２．３～３．３Ｍｇ／ｍ3とすることが好ましい。
The particle size of the iron-based powder is not particularly limited and may be any value, but is preferably 60 mesh (250 μm) or less. The apparent density of the iron-based powder is not particularly limited and can be any value, but it is preferably 2.3 to 3.3 Mg / m 3 .
［合金用粉末］
上記合金用粉末としては、特に限定されることなく、合金元素を含有する任意の粉末を用いることができる。合金用粉末としては、例えば、黒鉛粉末などの炭素粉末、Ｃｕ粉、Ｍｏ粉、Ｎｉ粉などの非鉄金属粉末、および亜酸化銅粉末などの金属酸化物粉末が挙げられる。前記合金用粉末は１種のみを用いることもできるが、２種以上を組み合わせて用いることもできる。 [Alloy powder]
The alloy powder is not particularly limited, and any powder containing an alloy element can be used. Examples of the alloy powder include carbon powder such as graphite powder, non-ferrous metal powder such as Cu powder, Mo powder and Ni powder, and metal oxide powder such as cuprous oxide powder. Only one type of the alloy powder can be used, but two or more types can be used in combination.
上記合金用粉末としては、特に限定されることなく、合金元素を含有する任意の粉末を用いることができる。合金用粉末としては、例えば、黒鉛粉末などの炭素粉末、Ｃｕ粉、Ｍｏ粉、Ｎｉ粉などの非鉄金属粉末、および亜酸化銅粉末などの金属酸化物粉末が挙げられる。前記合金用粉末は１種のみを用いることもできるが、２種以上を組み合わせて用いることもできる。 [Alloy powder]
The alloy powder is not particularly limited, and any powder containing an alloy element can be used. Examples of the alloy powder include carbon powder such as graphite powder, non-ferrous metal powder such as Cu powder, Mo powder and Ni powder, and metal oxide powder such as cuprous oxide powder. Only one type of the alloy powder can be used, but two or more types can be used in combination.
［結合剤］
上記合金用粉末は、結合剤によって鉄基粉末の表面に固着される。前記結合剤としては、特に限定されることなく、鉄基粉末と合金用粉末を結合させることができるものであれば任意のものを用いることができる。前記結合剤としては、例えば、脂肪酸、脂肪酸アミド、脂肪酸ビスアミド、金属石鹸からなる群より選択される１または２以上を用いることができる。 [Binder]
The alloy powder is fixed to the surface of the iron-based powder by a binder. The binder is not particularly limited, and any binder can be used as long as it can bind the iron-based powder and the alloy powder. As the binder, for example, one or more selected from the group consisting of fatty acids, fatty acid amides, fatty acid bisamides, and metal soaps can be used.
上記合金用粉末は、結合剤によって鉄基粉末の表面に固着される。前記結合剤としては、特に限定されることなく、鉄基粉末と合金用粉末を結合させることができるものであれば任意のものを用いることができる。前記結合剤としては、例えば、脂肪酸、脂肪酸アミド、脂肪酸ビスアミド、金属石鹸からなる群より選択される１または２以上を用いることができる。 [Binder]
The alloy powder is fixed to the surface of the iron-based powder by a binder. The binder is not particularly limited, and any binder can be used as long as it can bind the iron-based powder and the alloy powder. As the binder, for example, one or more selected from the group consisting of fatty acids, fatty acid amides, fatty acid bisamides, and metal soaps can be used.
［副原料］
本発明においては、上記鉄基粉末、合金用粉末、および結合剤に加えて、さらに任意の副原料を用いることができる。前記副原料としては、固体潤滑剤、切削性改善材粉、摺動性改善材粉、および流動性改善材粉からなる群より選択される１または２以上が好ましい。 [Sub raw materials]
In the present invention, in addition to the iron-based powder, the alloy powder, and the binder, any auxiliary raw material can be used. The auxiliary material is preferably one or more selected from the group consisting of solid lubricant, machinability improving material powder, slidability improving material powder, and fluidity improving material powder.
本発明においては、上記鉄基粉末、合金用粉末、および結合剤に加えて、さらに任意の副原料を用いることができる。前記副原料としては、固体潤滑剤、切削性改善材粉、摺動性改善材粉、および流動性改善材粉からなる群より選択される１または２以上が好ましい。 [Sub raw materials]
In the present invention, in addition to the iron-based powder, the alloy powder, and the binder, any auxiliary raw material can be used. The auxiliary material is preferably one or more selected from the group consisting of solid lubricant, machinability improving material powder, slidability improving material powder, and fluidity improving material powder.
前記固体潤滑剤としては、特に限定されることなく任意の固体潤滑剤を用いることができる。前記固体潤滑剤としては、ステアリン酸亜鉛およびエチレンビスアミドの少なくとも一方を用いることが好ましい。
The solid lubricant is not particularly limited, and any solid lubricant can be used. As the solid lubricant, it is preferable to use at least one of zinc stearate and ethylene bisamide.
前記切削性改善材粉としては、特に限定されることなく任意の切削性改善材粉を用いることができる。前記切削性改善材粉としては、ＭｎＳ粉を用いることが好ましい。
The machinability improving material powder is not particularly limited, and any machinability improving material powder can be used. As the machinability improving material powder, MnS powder is preferably used.
前記摺動性改善材粉としては、特に限定されることなく任意の摺動性改善材粉を用いることができる。前記摺動性改善材粉としては、Ｓ（硫黄）粉およびＭｏ2Ｓ粉の少なくとも一方を用いることが好ましい。
The sliding property improving material powder is not particularly limited, and any sliding property improving material powder can be used. As the sliding property improving material powder, it is preferable to use at least one of S (sulfur) powder and Mo 2 S powder.
前記流動性改善材粉としては、特に限定されることなく任意の流動性改善材粉を用いることができる。前記流動性改善材粉としては、ＳｉＯ2粉およびカーボンブラックの少なくとも一方を用いることが好ましい。
The fluidity improving material powder is not particularly limited, and any fluidity improving material powder can be used. As the fluidity improving material powder, it is preferable to use at least one of SiO 2 powder and carbon black.
次に、上記原料を混合攪拌して粉末冶金用混合粉末とする手順について説明する。
Next, the procedure for mixing and stirring the above raw materials to obtain a mixed powder for powder metallurgy will be described.
［１次混合攪拌工程］
初めに、上記原料を第１の混合攪拌装置１０に装入し、混合攪拌を行う。第１の混合攪拌装置１０としては、加熱手段を備える混合攪拌装置であれば、任意のものを用いることができる。前記第１の混合攪拌装置１０としては、高速底部攪拌混合機を用いることが好ましく、とくに、ヘンシェルミキサーを用いることが好ましい。高速底部撹拌式混合機は、図１に示すように、混合槽の底部に設けられた回転羽根１１が回転軸１２を中心に回転することによって、混合槽内の粉体を撹拌して混合するものである。 [Primary mixing and stirring step]
First, the raw material is charged into the first mixing and stirringdevice 10 and mixed and stirred. As the first mixing and stirring device 10, any device can be used as long as it is a mixing and stirring device provided with heating means. As the first mixing and stirring device 10, a high-speed bottom stirring mixer is preferably used, and in particular, a Henschel mixer is preferably used. As shown in FIG. 1, the high-speed bottom agitating mixer agitates and mixes the powder in the mixing tank by rotating the rotating blades 11 provided at the bottom of the mixing tank around the rotating shaft 12. Is.
初めに、上記原料を第１の混合攪拌装置１０に装入し、混合攪拌を行う。第１の混合攪拌装置１０としては、加熱手段を備える混合攪拌装置であれば、任意のものを用いることができる。前記第１の混合攪拌装置１０としては、高速底部攪拌混合機を用いることが好ましく、とくに、ヘンシェルミキサーを用いることが好ましい。高速底部撹拌式混合機は、図１に示すように、混合槽の底部に設けられた回転羽根１１が回転軸１２を中心に回転することによって、混合槽内の粉体を撹拌して混合するものである。 [Primary mixing and stirring step]
First, the raw material is charged into the first mixing and stirring
第１の混合攪拌装置１０は、原料を加熱するための加熱手段を備えている必要がある。前記加熱手段としては、特に限定されることなく、装入された原料を加熱することができるものであれば任意のものを用いることができる。例えば、図１に示すように、第１の混合攪拌装置１０の外周を二重壁として、二重構造部１３に熱媒体を流通させることで混合槽内の原料を加熱することができる。前記熱媒体としては、例えば、蒸気やオイルを用いることができる。また、前記加熱手段としてヒーターを用いることもできる。前記ヒーターとしては、例えば、電気ヒーターを用いることができる。また、複数の加熱手段を併用することもできる。前記第１の混合撹拌装置は、加熱手段を備え、冷却手段を備えないことが好ましい。
The first mixing and stirring device 10 needs to have a heating means for heating the raw material. The heating means is not particularly limited, and any heating means can be used as long as it can heat the charged raw material. For example, as shown in FIG. 1, the raw material in the mixing tank can be heated by circulating the heat medium through the double structure 13 with the outer periphery of the first mixing and stirring device 10 as a double wall. As the heat medium, for example, steam or oil can be used. Moreover, a heater can also be used as the heating means. For example, an electric heater can be used as the heater. A plurality of heating means can be used in combination. The first mixing and stirring device preferably includes a heating unit and does not include a cooling unit.
前記１次混合攪拌工程においては、前記原料を、該原料に含まれる結合剤の融点Ｔmより高い温度Ｔ1まで加熱する。このように加熱することにより、結合剤が溶融し、溶融した結合剤が鉄基粉末の表面に塗布され、さらに該結合剤を介して合金用粉末および副原料が鉄基粉末表面に付着する。
In the primary mixing and stirring step, the raw material is heated to a temperature T 1 higher than the melting point T m of the binder contained in the raw material. By heating in this way, the binder is melted, the melted binder is applied to the surface of the iron-based powder, and the alloy powder and the auxiliary raw material adhere to the surface of the iron-based powder through the binder.
前記加熱の手順は特に限定されないが、均一に付着させるという観点からは、攪拌しながら温度Ｔ1まで昇温し、次いで、温度Ｔ1に保持した状態でさらに攪拌することが好ましい。
The heating procedure is not particularly limited, but from the viewpoint of uniform adhesion, it is preferable that the temperature is raised to temperature T 1 while stirring, and then further stirred while maintaining the temperature T 1 .
次いで、１次混合撹拌を停止し、第１の混合攪拌装置１０内の粉体を排出する。排出された粉体は、次の２次混合攪拌工程に供される。
Next, the primary mixing and stirring is stopped, and the powder in the first mixing and stirring device 10 is discharged. The discharged powder is subjected to the next secondary mixing and stirring step.
［２次混合攪拌工程］
次に、上記１次混合攪拌工程で混合攪拌された後の原料粉を、前記第１の混合攪拌装置とは別の、冷却手段を備える第２の混合攪拌装置に装入する。第２の混合攪拌装置２０としては、冷却手段を備える混合攪拌装置であれば、任意のものを用いることができる。前記第２の混合攪拌装置２０としては、高速底部攪拌混合機を用いることが好ましく、とくに、撹拌力が強く、冷却速度を大きくすることができるヘンシェルミキサーを用いることが好ましい。 [Secondary mixing and stirring step]
Next, the raw material powder that has been mixed and stirred in the primary mixing and stirring step is charged into a second mixing and stirring device that is provided with a cooling means different from the first mixing and stirring device. As the second mixing and stirringdevice 20, any mixing stirring device provided with a cooling means can be used. As the second mixing and stirring device 20, it is preferable to use a high-speed bottom stirring mixer, and it is particularly preferable to use a Henschel mixer that has a strong stirring force and can increase the cooling rate.
次に、上記１次混合攪拌工程で混合攪拌された後の原料粉を、前記第１の混合攪拌装置とは別の、冷却手段を備える第２の混合攪拌装置に装入する。第２の混合攪拌装置２０としては、冷却手段を備える混合攪拌装置であれば、任意のものを用いることができる。前記第２の混合攪拌装置２０としては、高速底部攪拌混合機を用いることが好ましく、とくに、撹拌力が強く、冷却速度を大きくすることができるヘンシェルミキサーを用いることが好ましい。 [Secondary mixing and stirring step]
Next, the raw material powder that has been mixed and stirred in the primary mixing and stirring step is charged into a second mixing and stirring device that is provided with a cooling means different from the first mixing and stirring device. As the second mixing and stirring
第２の混合攪拌装置２０は、原料を冷却するための冷却手段を備えている必要がある。前記冷却手段としては、特に限定されることなく、第２の混合攪拌装置２０内の粉体を冷却することができるものであれば任意のものを用いることができる。例えば、第１の混合攪拌装置１０と同様に、第２の混合攪拌装置２０の外周を二重壁として、二重構造部２３に冷却媒体を流通させることで混合槽内の原料を冷却することができる。前記冷却媒体としては、例えば、低温の水やオイルを用いることができる。前記第２の混合撹拌装置は、冷却手段を備え、加熱手段を備えないことが好ましい。
The second mixing and stirring device 20 needs to have a cooling means for cooling the raw material. The cooling means is not particularly limited, and any means can be used as long as it can cool the powder in the second mixing and stirring device 20. For example, similarly to the first mixing and stirring device 10, the outer periphery of the second mixing and stirring device 20 is used as a double wall, and the cooling medium is circulated through the double structure portion 23 to cool the raw material in the mixing tank. Can do. For example, low-temperature water or oil can be used as the cooling medium. The second mixing and stirring apparatus preferably includes a cooling unit and does not include a heating unit.
前記２次混合攪拌工程においては、前記原料を、該原料に含まれる結合剤の融点Ｔmより低い温度Ｔ2まで冷却する。このように冷却することにより、結合剤が固化し、合金用粉末と副原料が、結合剤によって鉄基粉末の表面に固定される。
する。 In the secondary mixing and stirring step, the raw material is cooled to a temperature T 2 lower than the melting point T m of the binder contained in the raw material. By cooling in this way, the binder is solidified, and the alloy powder and the auxiliary material are fixed to the surface of the iron-based powder by the binder.
To do.
する。 In the secondary mixing and stirring step, the raw material is cooled to a temperature T 2 lower than the melting point T m of the binder contained in the raw material. By cooling in this way, the binder is solidified, and the alloy powder and the auxiliary material are fixed to the surface of the iron-based powder by the binder.
To do.
前記冷却の方法は特に限定されないが、攪拌しながら温度Ｔ2まで冷却することが好ましい。なお、温度Ｔ2は、結合剤の融点Ｔmより低い温度であれば任意の温度とすることができるが、常温とすることが好ましい。
The cooling method is not particularly limited, but it is preferable to cool to temperature T 2 while stirring. The temperature T 2 can be any temperature as long as it is lower than the melting point T m of the binder, but is preferably room temperature.
本発明では、上記の通り、１次混合攪拌工程では加熱だけを行い、２次混合攪拌工程では冷却だけを行うというように、加熱と冷却を別々の混合攪拌装置で行い、従来のように１つの混合攪拌装置で加熱と冷却を行わない。そのため、混合機の二重構造部分に加熱と冷却の繰り返しによる膨張と収縮が加わらず、長年にわたって工業的に生産を継続しても金属疲労による亀裂発生が無く、高温の蒸気やオイルが洩れ出す事故を起こすことが無い。したがって、作業者が高温の蒸気やオイルに接触して火傷を起こす危険性が無く、安全な生産活動を行う事が可能となる。また、高温の蒸気やオイルが混合機の内側に洩れ出すと、汚染された混合粉末は製品にすることが出来なくなることに加え、亀裂の補修工事を行う期間は生産が出来なくなり生産効率が低下するなどの問題があるが、本発明によればそのような問題の発生を防ぐことができる。また、第１の混合攪拌装置１０で冷却を行わないため、次のバッチの混合攪拌を行う際にも混合攪拌装置の二重構造部１３の温度が低下しておらず、加熱温度Ｔ1付近に保たれているため、次のバッチにおける昇温時間を短縮できる上に、エネルギーのロスも抑制できる。
In the present invention, as described above, heating and cooling are performed by separate mixing and stirring devices such that only heating is performed in the primary mixing and stirring step and only cooling is performed in the secondary mixing and stirring step. No heating and cooling with two mixing stirrers. Therefore, expansion and contraction due to repeated heating and cooling are not added to the double structure part of the mixer, and cracks due to metal fatigue do not occur even if industrial production is continued for many years, and high temperature steam and oil leak out. There is no accident. Therefore, there is no risk of burns due to contact with high-temperature steam or oil, and safe production activities can be performed. In addition, if high-temperature steam or oil leaks inside the mixer, the contaminated mixed powder cannot be made into a product, and production is not possible during the repair period of cracks, reducing production efficiency. However, according to the present invention, the occurrence of such a problem can be prevented. In addition, since the first mixing and stirring device 10 does not perform cooling, the temperature of the double structure portion 13 of the mixing and stirring device does not decrease even when mixing and stirring the next batch, and the vicinity of the heating temperature T 1 Therefore, the temperature increase time in the next batch can be shortened, and energy loss can be suppressed.
次いで、２次混合撹拌を停止し、第２の混合攪拌装置２０内の粉体を排出する。排出された粉体は、次の３次混合攪拌工程に供される。
Next, the secondary mixing and stirring is stopped, and the powder in the second mixing and stirring device 20 is discharged. The discharged powder is subjected to the next tertiary mixing and stirring step.
［３次混合攪拌工程］
次に、上記２次混合攪拌工程で混合攪拌された後の原料粉を、前記第１の混合攪拌装置および第２の混合攪拌装置とは別の、第３の混合攪拌装置３０に装入する。なお、図１に示すように、第３の混合装置への装入前に、粉体を一時的に貯槽４０などの貯蔵手段に収容することもできるが、その場合についての説明は後述する。 [Tertiary mixing and stirring step]
Next, the raw material powder that has been mixed and stirred in the secondary mixing and stirring step is charged into a third mixing and stirringdevice 30 that is different from the first mixing and stirring device and the second mixing and stirring device. . As shown in FIG. 1, the powder can be temporarily stored in a storage means such as a storage tank 40 before being charged into the third mixing device, and the description of this case will be described later.
次に、上記２次混合攪拌工程で混合攪拌された後の原料粉を、前記第１の混合攪拌装置および第２の混合攪拌装置とは別の、第３の混合攪拌装置３０に装入する。なお、図１に示すように、第３の混合装置への装入前に、粉体を一時的に貯槽４０などの貯蔵手段に収容することもできるが、その場合についての説明は後述する。 [Tertiary mixing and stirring step]
Next, the raw material powder that has been mixed and stirred in the secondary mixing and stirring step is charged into a third mixing and stirring
第３の混合攪拌装置３０としては、任意のものを用いることができるが、Ｗコーン型混合機を用いることが好ましい。第３の混合攪拌装置３０を用いて攪拌混合を行うことにより、最終的な粉末冶金用混合粉末を得ることができる。なお、３次混合攪拌工程では、粉体の加熱や冷却を行う必要が無いため、第３の混合攪拌装置３０としては、加熱手段と冷却手段を備えていない混合攪拌装置を用いることができる。
As the third mixing and stirring device 30, any device can be used, but it is preferable to use a W cone type mixer. The final mixed powder for powder metallurgy can be obtained by performing stirring and mixing using the third mixing and stirring device 30. In the tertiary mixing and stirring step, since it is not necessary to heat or cool the powder, the third mixing and stirring device 30 can be a mixing and stirring device that does not include heating means and cooling means.
３次混合攪拌工程においては、第２の混合攪拌装置２０から排出された粉末に加えて、さらに追加の副原料を添加することもできる。前記追加の副原料としては、固体潤滑剤、切削性改善材粉、摺動性改善材粉、および流動性改善材粉からなる群より選択される１または２以上を用いることができる。前記追加の副原料は、１次混合攪拌工程に供される原料に含まれる副原料と同じものであってもよく、異なるものであってもよい。
In the tertiary mixing and stirring step, in addition to the powder discharged from the second mixing and stirring device 20, an additional auxiliary material can be added. As the additional auxiliary material, one or more selected from the group consisting of a solid lubricant, a machinability improving material powder, a slidability improving material powder, and a fluidity improving material powder can be used. The additional auxiliary material may be the same as or different from the auxiliary material included in the raw material used in the primary mixing and stirring step.
本発明の一実施形態においては、１次混合攪拌工程と前記２次混合攪拌工程からなるバッチを別々に複数バッチ行った後、前記複数バッチのそれぞれで得られた粉末をまとめて前記３次混合攪拌工程に供することができる。このように、複数バッチ分の粉体をまとめて１回で３次混合攪拌することにより、複数バッチ分の粉体を最終的な粉末冶金用混合粉末の１ロットとすることができるため、ロット数を減らすことができ、品質管理など日常管理を効率化することができる。
In one embodiment of the present invention, a batch composed of a primary mixing and stirring step and a secondary mixing and stirring step are separately performed in a plurality of batches, and then the powder obtained in each of the plurality of batches is collected and the tertiary mixing is performed. It can use for a stirring process. In this way, multiple batches of powder can be batch mixed and stirred at one time, so that multiple batches of powder can be made into one lot of mixed powder for powder metallurgy. The number can be reduced, and daily management such as quality control can be made more efficient.
上記のように、複数バッチで得られた粉末をまとめて前記３次混合攪拌工程に供する場合には、第２の混合攪拌装置２０から排出された粉体を、随時第３の混合攪拌装置３０に装入していくこともできるが、図１に示すように、貯槽４０などの貯蔵手段に蓄積しておくこともできる。これにより、第３の混合攪拌装置３０で前のロットの粉体を混合攪拌している間にも、制限されること無く、１次混合攪拌工程および２次混合攪拌工程を実施することができる。
As described above, when the powders obtained in a plurality of batches are collectively used in the tertiary mixing and stirring step, the powder discharged from the second mixing and stirring device 20 is added to the third mixing and stirring device 30 as needed. However, as shown in FIG. 1, it can also be stored in storage means such as a storage tank 40. Accordingly, the primary mixing and stirring step and the secondary mixing and stirring step can be performed without being limited even while the third mixing and stirring device 30 is mixing and stirring the powder of the previous lot. .
その際、複数バッチ分の粉体を貯槽に蓄積し、その後、まとめて３次混合攪拌するために、前記貯槽の容量ＶSおよび前記第３の混合攪拌装置の処理容量Ｖ3は、前記第２の混合攪拌装置の処理容量Ｖ2の２倍以上であることが好ましい。
At that time, in order to accumulate a plurality of batches of powder in the storage tank, and then collectively mix and stir, the storage capacity V S and the processing capacity V 3 of the third mixing and stirring apparatus are 2 or more of the processing volume V 2 of the mixing and stirring apparatus 2 is preferable.
本発明では、工業的生産の際の効率を最大にするために、１次混合撹拌工程と２次混合撹拌工程の処理時間を等しくすることが好ましい。また３次混合撹拌工程は、貯槽１３で２次混合撹拌処理済の混合粉を貯めている間に、処理を完了させて、１次混合撹拌工程と２次混合撹拌工程で渋滞を招かないように設計することが望ましい。例えば、上述したように、２次混合攪拌工程の複数バッチで得られた粉末をまとめて３次混合攪拌工程に供する場合には、前記３次混合攪拌工程の処理時間を、前記複数バッチの処理時間以下とすることが好ましい。
In the present invention, in order to maximize the efficiency in industrial production, it is preferable to equalize the processing times of the primary mixing and stirring step and the secondary mixing and stirring step. Further, in the tertiary mixing stirring process, while the mixed powder that has been subjected to the secondary mixing stirring process is being stored in the storage tank 13, the process is completed so as not to cause congestion in the primary mixing stirring process and the secondary mixing stirring process. It is desirable to design. For example, as described above, when the powders obtained in a plurality of batches of the secondary mixing and stirring step are collectively used for the tertiary mixing and stirring step, the processing time of the tertiary mixing and stirring step is set to the processing of the plurality of batches. It is preferable that the time is not longer than the time.
１０ 第１の混合攪拌装置
１１、２１ 回転羽根
１２、２２ 回転軸
１３、２３ 二重構造部
２０ 第２の混合攪拌装置
３０ 第３の混合攪拌装置
４０ 貯槽 DESCRIPTION OFSYMBOLS 10 1st mixing and stirring apparatus 11, 21 Rotary blade 12, 22 Rotary shaft 13, 23 Double structure part 20 2nd mixing and stirring apparatus 30 3rd mixing and stirring apparatus 40 Storage tank
１１、２１ 回転羽根
１２、２２ 回転軸
１３、２３ 二重構造部
２０ 第２の混合攪拌装置
３０ 第３の混合攪拌装置
４０ 貯槽 DESCRIPTION OF
Claims (7)
- 粉末冶金用混合粉末の製造方法であって、
鉄基粉末、合金用粉末、結合剤、および副原料からなる原料を、加熱手段を備える第１の混合攪拌装置を用いて混合攪拌する１次混合攪拌工程と、
前記１次混合攪拌工程後の前記原料を、前記第１の混合攪拌装置とは別の、冷却手段を備える第２の混合攪拌装置を用いて混合攪拌する２次混合攪拌工程と、
前記２次混合攪拌工程後の前記原料を、前記第１の混合攪拌装置および前記第２の混合攪拌装置とは別の、第３の混合攪拌装置を用いて混合攪拌する３次混合攪拌工程を有し、
前記１次混合攪拌工程においては、前記原料が前記結合剤の融点Ｔmより高い温度Ｔ1まで加熱され、
前記２次混合攪拌工程においては、前記原料が前記Ｔmより低い温度Ｔ2まで冷却される、粉末冶金用混合粉末の製造方法。 A method for producing a mixed powder for powder metallurgy, comprising:
A primary mixing and stirring step of mixing and stirring a raw material composed of an iron-based powder, an alloy powder, a binder, and auxiliary materials using a first mixing and stirring device including a heating unit;
A secondary mixing and stirring step in which the raw material after the primary mixing and stirring step is mixed and stirred using a second mixing and stirring device provided with a cooling means different from the first mixing and stirring device;
A tertiary mixing and stirring step of mixing and stirring the raw material after the secondary mixing and stirring step using a third mixing and stirring device different from the first mixing and stirring device and the second mixing and stirring device. Have
In the primary mixing and stirring step, the raw material is heated to a temperature T 1 higher than the melting point T m of the binder,
Wherein in the second mixing and stirring step, the raw material is cooled to the T lower than the m temperature T 2, the production method of the mixed powder for powder metallurgy. - 前記副原料が、固体潤滑剤、切削性改善材粉、摺動性改善材粉、および流動性改善材粉からなる群より選択される１または２以上である、請求項１に記載の粉末冶金用混合粉末の製造方法。 The powder metallurgy according to claim 1, wherein the auxiliary material is one or more selected from the group consisting of a solid lubricant, a machinability improving material powder, a slidability improving material powder, and a fluidity improving material powder. For producing mixed powder for use.
- 前記１次混合攪拌工程と前記２次混合攪拌工程からなるバッチを別々に複数バッチ行った後、
前記複数バッチのそれぞれで得られた粉末をまとめて前記３次混合攪拌工程に供する、請求項１または２に記載の粉末冶金用混合粉末の製造方法。 After performing a plurality of batches separately consisting of the primary mixing and stirring step and the secondary mixing and stirring step,
The method for producing a powder mixture for powder metallurgy according to claim 1 or 2, wherein the powders obtained in each of the plurality of batches are collectively used in the tertiary mixing and stirring step. - 前記１次混合攪拌工程の処理時間と前記２次混合攪拌工程の処理時間が同じであり、
前記３次混合攪拌工程の処理時間が、前記複数バッチの処理時間以下である、請求項３に記載の粉末冶金用混合粉末の製造方法。 The processing time of the primary mixing and stirring step is the same as the processing time of the secondary mixing and stirring step,
The method for producing a mixed powder for powder metallurgy according to claim 3, wherein a processing time of the tertiary mixing and stirring step is equal to or shorter than a processing time of the plurality of batches. - 粉末冶金用混合粉末の製造設備であって、
鉄基粉末、合金用粉末、結合剤、および副原料からなる原料を混合攪拌するための、加熱手段を備える第１の混合攪拌装置と、
前記第１の混合攪拌装置で混合攪拌された原料をさらに混合するための、冷却手段を備える第２の混合攪拌装置と、
前記第２の混合攪拌装置で混合攪拌された原料をさらに混合するための、第３の混合攪拌装置を備える、粉末冶金用混合粉末の製造設備。 A facility for producing mixed powder for powder metallurgy,
A first mixing and stirring device including heating means for mixing and stirring the raw material composed of iron-based powder, alloy powder, binder, and auxiliary materials;
A second mixing and stirring device comprising a cooling means for further mixing the raw materials mixed and stirred by the first mixing and stirring device;
A facility for producing mixed powder for powder metallurgy, comprising a third mixing and stirring device for further mixing the raw materials mixed and stirred by the second mixing and stirring device. - さらに、第２の混合攪拌装置で混合攪拌された原料を複数バッチ分貯めておくための貯槽を備える、請求項５に記載の粉末冶金用混合粉末の製造設備。 The facility for producing mixed powder for powder metallurgy according to claim 5, further comprising a storage tank for storing a plurality of batches of the raw material mixed and stirred by the second mixing and stirring device.
- 前記貯槽の容量ＶSおよび前記第３の混合攪拌装置の処理容量Ｖ3が、前記第２の混合攪拌装置の処理容量Ｖ2の２倍以上である、請求項６に記載の粉末冶金用混合粉末の製造設備。 The mixing for powder metallurgy according to claim 6, wherein a capacity V S of the storage tank and a processing capacity V 3 of the third mixing and stirring apparatus are at least twice as large as a processing capacity V 2 of the second mixing and stirring apparatus. Powder production equipment.
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| JP2002020801A (en) * | 2000-07-07 | 2002-01-23 | Kawasaki Steel Corp | Iron-based powdery mixture for powder metallurgy |
| US6464751B2 (en) * | 2000-10-06 | 2002-10-15 | Kawasaki Steel Corporation | Iron-based powders for powder metallurgy |
| TWI412416B (en) * | 2006-02-15 | 2013-10-21 | Jfe Steel Corp | Iron-based powder mixture and method of manufacturing iron-based compacted body and iron-based sintered body |
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2016
- 2016-10-24 JP JP2016207967A patent/JP6561962B2/en active Active
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2017
- 2017-09-25 WO PCT/JP2017/034554 patent/WO2018079160A1/en active Application Filing
- 2017-09-25 CN CN201780065223.8A patent/CN109862977B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5016163A (en) * | 1973-06-14 | 1975-02-20 | ||
| JPH0247201A (en) * | 1988-08-08 | 1990-02-16 | Kawasaki Steel Corp | Manufacture of ferrous powder mixed material for powder metallurgy |
| JPH03162502A (en) * | 1989-11-20 | 1991-07-12 | Kawasaki Steel Corp | Manufacture of iron base powder mixed material for powder metallurgy |
| WO2009025274A1 (en) * | 2007-08-20 | 2009-02-26 | Jfe Steel Corporation | Mixing method for raw powder for powder metallurgy and process for producing raw powder for powder metallurgy |
| CN103394686A (en) * | 2013-07-25 | 2013-11-20 | 莱芜钢铁集团有限公司 | Two-stage dry mixing method for powder metallurgy iron-based mixed powder |
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| Publication number | Publication date |
|---|---|
| JP6561962B2 (en) | 2019-08-21 |
| CN109862977B (en) | 2021-04-30 |
| CN109862977A (en) | 2019-06-07 |
| JP2018070903A (en) | 2018-05-10 |
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