WO2014174949A1 - 合金鋼製部品の表面改質装置、合金鋼製部品の表面改質方法および合金鋼製部品の製造方法 - Google Patents
合金鋼製部品の表面改質装置、合金鋼製部品の表面改質方法および合金鋼製部品の製造方法 Download PDFInfo
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- WO2014174949A1 WO2014174949A1 PCT/JP2014/057717 JP2014057717W WO2014174949A1 WO 2014174949 A1 WO2014174949 A1 WO 2014174949A1 JP 2014057717 W JP2014057717 W JP 2014057717W WO 2014174949 A1 WO2014174949 A1 WO 2014174949A1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
Definitions
- the present invention relates to a surface modification device for alloy steel parts made of an alloy steel material containing a nitride-forming element, a surface modification method for alloy steel parts, and a method for producing alloy steel parts.
- Patent Document 1 discloses a heat treatment method that improves the wear resistance and impact resistance by modifying the surface of a steel part by so-called ion nitriding (also referred to as “plasma nitriding”).
- the surface modification layer (cured layer) is made uniform by the holocathode effect and the edge effect.
- the holocathode effect is a phenomenon in which, when a hole portion having a small diameter is formed in a part made of alloy steel, discharge in the hole portion is difficult to be performed and the surface modification layer becomes non-uniform.
- the edge effect is a phenomenon in which, when an alloy steel part is formed with a corner having an acute angle, a right angle, or an obtuse angle, discharge is concentrated at the corner and the surface modification layer becomes non-uniform. Further, the ion nitriding treatment has a problem that it is not suitable for surface modification treatment of a large amount of steel parts because the steel parts to be treated must be arranged apart from each other in the treatment furnace.
- the present invention has been made to address the above problems, and its purpose is to provide a surface reforming apparatus for alloy steel parts, an alloy capable of obtaining a deep and uniform hardened layer for a wide range of shapes and a large amount of steel parts.
- An object of the present invention is to provide a method for surface modification of steel parts and a method for producing alloy steel parts.
- a feature of the present invention is a surface reforming apparatus for an alloy steel part for performing surface reforming of an alloy steel part made of an alloy steel material containing a nitride-forming element, the ammonia gas concentration Is provided with surface modification treatment means for modifying the surface by exposing the alloy steel part to at least 180 minutes or more in an atmosphere of 80% or more and a temperature of 610 ° C. to 630 ° C.
- the nitride-forming element is an element that forms a hard nitride by permeation and diffusion of nitrogen, and specifically, is at least one of chromium, molybdenum, and aluminum.
- the alloy steel material containing a nitride-forming element is obtained by adding the above-mentioned nitride-forming element to a carbon steel in an amount of not less than the minimum specified by JIS standard (Japanese Industrial Standard). 3 wt% or more, molybdenum is 0.08 wt% or more, and aluminum is 0.1 wt% or more.
- the surface reforming apparatus for alloy steel parts is made of alloy steel in an atmosphere having an ammonia gas concentration of 80% or more and a temperature of 610 ° C. to 630 ° C. It is configured to include surface modification processing means for exposing for at least 180 minutes.
- surface modification processing means for exposing for at least 180 minutes.
- the alloy steel parts to be processed in the processing furnace may be arranged with an interval around which ammonia gas is distributed. Even when compared with the nitriding treatment, a large amount of alloy steel parts can be efficiently surface-modified. According to experiments by the present inventors, it is preferable that the ammonia gas concentration is constant during the surface modification treatment for alloy steel parts.
- the temperature is 620 ° C. in the surface modification apparatus for the alloy steel part surface modification device.
- the surface reforming apparatus for alloy steel parts is set to 620 ° C. in the atmosphere to which the alloy steel parts are exposed.
- the cured layer can be formed more stably.
- the temperature of the atmosphere to which the alloy steel parts are exposed may be 610 ° C. or more and 630 ° C. or less, but a temperature of 615 ° C. or more and 625 ° C. or less is more preferable. Further, 620 ° C. is most preferable. In these cases, it is desirable to keep the temperature of the atmosphere to which the alloy steel parts are exposed during processing.
- the alloy steel parts include at least one of a sharp corner and a hole having a diameter of 8 mm or less. It is in.
- angular part the shape or sharp shape which assumed the part comprised by acute angle, right angle, or an obtuse angle, for example is assumed.
- the method for modifying the surface of an alloy steel part includes a sharp corner or a hole having a diameter of 8 mm or less in the alloy steel part. Even in this case, a uniform cured layer can be formed.
- the present invention can be implemented not only as an invention of a surface reforming apparatus for alloy steel parts, but also as an invention of a surface reforming method for alloy steel parts and a manufacturing method for alloy steel parts. .
- a method for surface modification of an alloy steel part is a surface reforming apparatus for an alloy steel part that performs surface modification of an alloy steel part made of an alloy steel containing a nitride-forming element, and includes ammonia What is necessary is just to include a surface modification treatment step in which the surface of the alloy steel is modified by exposing the alloy steel part to an atmosphere having a gas concentration of 80% or more and a temperature of 610 ° C. to 630 ° C. for at least 180 minutes.
- the temperature is more preferably from 615 ° C. to 625 ° C., and most preferably 620 ° C.
- the alloy steel part may include at least one of a sharp corner and a hole having a diameter of 8 mm or less.
- the method for producing an alloy steel part is a method for producing an alloy steel part made of an alloy steel material containing a nitride-forming element, wherein the ammonia gas concentration is 80% or more and the temperature is 610 ° C. or more and 630 ° C. or less.
- a surface modification treatment step of modifying the surface by exposing the alloy steel part to the atmosphere for at least 180 minutes may be included.
- 4 is a table showing chemical component values of samples A to E subjected to surface modification treatment by the surface modification method for alloy steel parts according to the present invention.
- 4 is a graph showing the hardness of a compound layer formed on each surface layer of samples A to E by a surface modification method for alloy steel parts according to the present invention. It is the graph which showed relatively the thickness of the compound layer formed in the surface layer of the sample B for every mutually different process conditions including the surface modification method of the alloy steel parts which concerns on this invention. It is the graph which showed relatively the thickness of the compound layer formed in the surface layer of the sample C for every mutually different process conditions including the surface modification method of the alloy steel parts which concerns on this invention.
- FIG. 1 is a schematic diagram showing an outline of the apparatus configuration of a surface reforming apparatus 100 for an alloy steel part used in the surface reforming method for an alloy steel part according to the present invention. Note that each drawing referred to in the present specification is schematically represented by exaggerating some of the components in order to facilitate understanding of the present invention. For this reason, the dimension, ratio, etc. between each component may differ.
- the surface reforming apparatus 100 is made of various alloy steel mechanical parts constituting vehicles such as four-wheeled vehicles and two-wheeled vehicles, for example, alloy steel parts 90 such as cylindrical boss parts constituting a power transmission device such as a clutch. It is the heat processing apparatus which performs the surface modification process for forming a hardened layer in the surface layer of this, and improving abrasion resistance.
- This alloy steel part 90 is a part that constitutes a power transmission device such as a clutch in a vehicle, and is made of an alloy steel material obtained by adding a nitride-forming element to carbon steel.
- the nitride-forming element added to the carbon steel is at least one element that forms a nitride when combined with nitrogen, and corresponds to, for example, chromium, molybdenum, and aluminum.
- the addition amount of these nitride forming elements is not less than the minimum amount determined by JIS standard (Japanese Industrial Standard), specifically, 0.3 wt% or more for chromium, 0.08 wt for molybdenum. % Or more, and 0.1% by weight or more for aluminum.
- the alloy steel part 90 is constituted by a main body 91 formed in a substantially cylindrical shape, as shown in detail in FIG.
- the main body 91 has a cylindrical sliding portion 92 on which other members constituting the power transmission device slide, and a disk shape radially outward from one end (right side in the drawing) of the sliding portion 92. It is comprised by the flange part 93 overhanging.
- a through-hole 94 is formed in the sliding portion 92 of the main body 91 so as to penetrate in the radial direction of the main body 91.
- the through hole 94 has a diameter of 8 mm.
- This surface reforming apparatus 100 includes a processing furnace 101.
- the processing furnace 101 is a substantially cylindrical container that is formed in an airtight manner to perform surface modification processing of the alloy steel part 90, and is a material that can withstand 620 ° C., which is the processing temperature of the alloy steel part 90. For example, it is made of a ceramic material.
- the processing furnace 101 mainly includes a main chamber 101a and a standby chamber 101b.
- the main chamber 101a is a space for performing a surface modification treatment of the alloy steel part 90
- the standby chamber 101b is used to move the alloy steel part 90 into and out of the main chamber 101a.
- This is a space for waiting, and is configured to include a release door 101c that opens and closes toward the outside.
- a partition wall 101d is provided between the main room 101a and the standby room 101b to freely open and close the two rooms. Further, between these main chamber 101a and standby chamber 101b, a transport mechanism that transports the alloy steel parts 90 between the standby chamber 101b and the main chamber 101a by operation control by a control device 111 described later. 101e.
- the partition wall 101c is indicated by a broken line
- the transfer mechanism 101e and the alloy steel part 90 in the standby chamber 101b are indicated by two-dot chain lines.
- a heater 102 is provided outside the outer peripheral surface of the processing furnace 101.
- the heater 102 is an electric heater for heating the inside of the main chamber 101a in the processing furnace 101 to 620 ° C. which is the processing temperature and maintaining the same temperature.
- the operation of the heater 102 is controlled by the control device 111.
- a main gas supply pipe 103, a sub gas supply pipe 106, and an exhaust pipe 109 are connected to the processing furnace 101, respectively.
- the main gas supply pipe 103 is a pipe for introducing ammonia gas (not shown) into the processing furnace 101.
- An upstream side of the main gas supply pipe 103 is connected to a main gas cylinder 105 via a flow rate regulator 104.
- the flow rate adjuster 104 is a device for adjusting the flow rate of the ammonia gas introduced into the processing furnace 101, and a flow rate adjustment that adjusts the flow rate of the vaporized ammonia gas and a vaporizer (not shown) that vaporizes the liquid ammonia.
- a valve (not shown) is provided.
- the operation of the flow regulator 104 is controlled by the control device 111.
- the main gas cylinder 105 is a container for storing liquid ammonia.
- the sub gas supply pipe 106 is a pipe for introducing nitrogen gas (not shown) into the processing furnace 101.
- a sub gas cylinder 108 is connected to the upstream side of the sub gas supply pipe 106 via a flow rate regulator 107.
- the flow rate regulator 107 is a device for adjusting the flow rate of nitrogen gas introduced into the processing furnace 101, and a vaporizer (not shown) that vaporizes liquid nitrogen and vaporized.
- a flow rate adjusting valve (not shown) for adjusting the flow rate of nitrogen gas is provided.
- the operation of the flow rate regulator 107 is controlled by the control device 111.
- the sub gas cylinder 108 is a container for storing liquid nitrogen.
- the exhaust pipe 109 is a pipe for guiding the gas in the processing furnace 101 to the outside of the processing furnace 101.
- an exhaust gas treatment device 110 Connected to the downstream side of the exhaust pipe 109 is an exhaust gas treatment device 110 that deodorizes and burns exhaust gas introduced from the inside of the processing furnace 101.
- the control device 111 is configured by a microcomputer including a CPU, a ROM, a RAM, and the like, an input device (not shown) for inputting instructions from the worker, and the surface modification device 100 for the worker. Is provided with a display device (not shown) for displaying the operation status.
- the control device 111 controls various operations of the surface modification device 100 by executing a program stored in advance in a storage device such as a ROM in accordance with an instruction from the operator. Specifically, the control apparatus 100 controls each operation
- FIG. 3 is a flowchart showing a manufacturing process for manufacturing the alloy steel part 90.
- the worker who manufactures the alloy steel part 90 first forms the alloy steel part 90 as the first step. Specifically, the operator uses a machining facility such as a machine tool (not shown) to cut the alloy steel material through the cutting, welding, and grinding processes of the main body 91, the sliding portion 92, the flange portion 93, and the through hole 94. Each molding is performed.
- the alloy steel part 90 is not subjected to a heat treatment such as a quenching process, but a heat treatment such as a quenching process is performed before or after the surface modification process according to the present invention. It is also possible to do this.
- the worker performs a surface modification process on the alloy steel part 90 as the second step.
- the surface modification treatment is a treatment for forming a hardened layer made of nitride on the surface layer of the alloy steel component 90.
- the operator operates the control device 111 to close the partition wall 101d in the processing furnace 101 so that the main chamber 101a is an airtight chamber, and then the alloy steel part 90 formed by the machining is used.
- An alloy steel part 90 is arranged in the waiting chamber 101b through the open / close door 101c. In this case, when arranging a plurality of alloy steel parts 90, the operator arranges each alloy steel part 90 through an interval in which ammonia gas is spread.
- the operator operates the control device 111 to introduce ammonia gas and nitrogen gas into the main chamber 101 a in the processing furnace 101 and heat the processing furnace 101.
- the operator introduces ammonia gas and nitrogen gas into the main chamber 101a so that 80% or more of the gas occupying the main chamber 101a of the processing furnace 101 is occupied by ammonia gas and the remainder is occupied by nitrogen gas.
- the worker heats the temperature in the main chamber 101a of the processing furnace 101 to 620 ° C.
- the operator operates the control device 111 when the ammonia gas concentration in the main chamber 101a in the processing furnace 101 is 80% and the temperature in the main chamber 101a is 620 ° C. or higher.
- the alloy steel part 90 in the standby chamber 101b is moved into the main chamber 101a.
- the operator maintains the atmosphere in the main chamber 101a in the processing furnace 101 by operating the control device 111.
- the concentration of ammonia gas in the main chamber 101a is 80%, and the inside of the main chamber 101a.
- the steel alloy parts 90 are exposed for at least 180 minutes in an atmosphere maintained at a constant temperature of 620 ° C. That is, this processing furnace 101 corresponds to the surface modification processing means according to the present invention.
- a hardened layer including a compound layer and a diffusion layer is generated on the surface layer of the alloy steel part 90 in order from the outermost surface.
- the surface reforming process for the alloy steel part 90 is performed by the nitrogen drifting in the main chamber 101a coming into contact with the alloy steel part 90, so that the inside of the through hole 94 and the corner part such as the flange 92 are formed.
- a uniform cured layer is generated without unevenness.
- the operator After exposing the alloy steel part 90 to the atmosphere in the main chamber 101a of the processing furnace 101 for at least 180 minutes, the operator operates the control device 111 to supply ammonia gas and nitrogen gas to the processing furnace 101. The supply is stopped and heating in the processing furnace 101 is stopped. Then, after the temperature in the processing furnace 101 is lowered to a temperature lower than a predetermined temperature (for example, 150 ° C.), the operator takes out the alloy steel part 90 from the processing furnace 101.
- a predetermined temperature for example, 150 ° C.
- FIG. 4 is a graph showing an example of the change in hardness with respect to the distance from the surface layer of the alloy steel part 90 containing a so-called nitride-forming element.
- the alloy steel part 90 has a thickness of 660 HmV to 880 HmV in a thickness from the surface to about 25 ⁇ m, and a 780 HmV hardness compound layer is formed. It can be confirmed that the diffusion layer is formed at a depth of up to 0.2 mm. This means that a compound layer having a hardness (750 HmV or higher) equal to or higher than that of chromium plating specified in JIS (Japanese Industrial Standard) can be formed on the surface of the alloy steel part 90.
- JIS Japanese Industrial Standard
- the worker performs finishing as the third step. Specifically, the operator performs grinding on the outer surface in order to form the alloy steel part 90 taken out from the processing furnace 101 to a predetermined size or surface roughness. In this case, since a compound layer having a thickness of 25 ⁇ m or more is formed on the surface of the alloy steel part 90, the operator can easily process the alloy into a predetermined size or surface roughness with a sufficient machining allowance. it can.
- FIG. 5 shows the chemical component values of samples A to E used in this experiment.
- FIG. 6 shows the measurement results of the surface hardness of the samples A to E when the samples A to E shown in FIG. 5 are subjected to the same surface modification treatment as in the above embodiment.
- the hardness of the sample B in which the alloy steel part 90 satisfies the hardness required for the part specification is 100%, and the hardness of the other samples A and C to E is shown.
- the alloy steel part 09 needs to be composed of an alloy steel material containing a nitride-forming element.
- FIG. 7 to FIG. 10 show the surface of each of the samples A to E shown in FIG. 5 according to the conventional conditions, temperature changing conditions, time changing conditions, concentration changing conditions and the present invention conditions.
- the measurement results of the compound layer thicknesses of the samples B to E when the modification treatment is performed are shown.
- the compound layer thickness increased by 60% with respect to the compound layer thickness when the surface modification treatment under the conventional conditions is performed on the sample B (target rate 100%). Represents the compound layer thicknesses of the other samples C to E.
- the conventional technique is a conventional gas nitriding treatment.
- the temperature is 530 to 580 ° C.
- the treatment time is 60 to 180 minutes
- the ammonia gas concentration in the furnace is 30 to 50.
- the alloy steel part 90 is subjected to so-called gas soft nitriding treatment in a% atmosphere.
- the hardness in this prior art is generally 350 HmV or more, and the thickness of the compound layer is about 8 ⁇ m to 15 ⁇ m.
- the temperature changing condition is to process the alloy steel part 90 under the processing condition in which only the temperature condition is changed to 620 ° C. which is the temperature condition in the present invention with respect to the conventional condition.
- the time change condition is to process the alloy steel part 90 under the process condition in which only the time condition is changed to 180 minutes or more which is the time condition in the present invention with respect to the conventional condition.
- the concentration change condition refers to the alloy steel part 90 under the processing condition in which the ammonia gas, which is the gas concentration condition in the present invention, is changed to 80% or more only in the gas concentration condition for closing the main chamber 101a with respect to the conventional condition. Is to process.
- the conditions of the present invention are to treat the alloy steel part 90 under the processing conditions in the above-described embodiment, that is, the processing conditions in which the temperature is 620 ° C., the processing time is 180 minutes or more, and the ammonia concentration is 80% or more. .
- the thickness of the compound layer formed by the processing conditions in the present invention depends on the temperature conditions, time conditions and ammonia concentration conditions in the processing conditions in the present invention. It can be confirmed that the compound layer can be formed to be thicker than the thickness of the compound layer formed according to the processing conditions employed in the above. That is, the thickness of the compound layer formed according to the present invention cannot be realized under the processing conditions in which the processing conditions in the present invention are partially adopted, and all of the temperature conditions, time conditions and ammonia concentration conditions in the present invention. This is achieved only by executing processing conditions including the following conditions.
- the conventional ratio of the thickness of the cured layer formed by the surface modification treatment according to the present invention is 1.9 times to 2.
- the increase rate of the diffusion layer is 1.2 times to 1.6 times.
- the compound layer and the diffusion layer increase as the compound layer increases, but the increase rate itself is smaller than the increase rate of the compound layer. That is, according to the surface modification treatment according to the present invention, the thickness of the compound layer formed on the surface while suppressing modification of the base material inside the alloy steel part 90, more specifically, the portion having toughness. Can be increased. Therefore, the surface modification treatment according to the present invention is particularly useful for mechanical parts that have toughness inside and require wear resistance on the surface.
- the thickness of the compound layer formed on the surface of the samples B to E by the surface modification treatment according to the present invention is 25 ⁇ m to 33 ⁇ m, which is the thickness of the compound layer formed by the conventional gas nitriding treatment.
- conventional heat treatment products that have been carburized and chrome-plated to chromium molybdenum steel, and heat-treated products that have been induction-hardened and chrome-plated to medium carbon steel, they are thick layers that approach the depth of each hardened layer. is there.
- the surface reforming apparatus 100 for alloy steel parts is made of alloy steel parts in an atmosphere where the concentration of ammonia gas is 80% or more and the temperature is 620 ° C.
- a processing furnace 101 that exposes 90 for at least 180 minutes is provided.
- a compound layer having a thickness of 25 ⁇ m or more can be stably formed on the surface of the alloy steel part 90. That is, according to the surface reforming apparatus 100 for the alloy steel part 90 according to the present invention, since the surface reforming process is performed in an atmosphere in which nitrogen generated by the thermal decomposition of ammonia gas drifts, A deep and uniform hardened layer can be formed on the component 90.
- the alloy steel parts 90 to be processed in the processing furnace 101 may be arranged at intervals such that ammonia gas is spread. Therefore, the surface modification treatment can be efficiently performed on a large amount of alloy steel parts 90 as compared with the ion nitriding treatment.
- the gas concentration in the main chamber 101a of the processing furnace 101 is configured such that ammonia gas occupies 80% or more and the remainder is nitrogen gas.
- the concentration of the gas in the main chamber 101a is not necessarily limited to the above embodiment as long as ammonia gas occupies at least 80% or more. Therefore, you may comprise so that the inside of the main chamber 101a may be occupied only with ammonia gas. Further, 80% or more of the gas concentration in the main chamber 101a may be occupied by ammonia gas, and the remainder may be occupied by another gas such as carbon gas or hydrogen gas instead of or in addition to nitrogen gas. Good. In these cases, according to experiments by the present inventors, it is preferable to keep the ammonia gas concentration constant during the surface modification treatment for the alloy steel part 90.
- the surface modification treatment of the alloy steel part 90 was performed in a state where the inside of the main chamber 101a in the processing furnace 101 was heated to 620 ° C. and maintained.
- the temperature condition of the surface modification treatment in the present invention is within a range of ⁇ 10 ° C. with respect to 620 ° C., that is, within a range of 610 ° C. or more and 630 ° C. or less. It was confirmed that the effects of the present invention were exhibited, and it was confirmed that the effects of the present invention could not be sufficiently exhibited outside these temperature ranges.
- the temperature of the atmosphere to which the alloy steel parts are exposed is more preferably 615 ° C. or more and 625 ° C. or less, and the most effective temperature condition is 620 ° C. It was confirmed. In these cases, it was also confirmed that the temperature of the atmosphere to which the alloy steel parts are exposed should be kept constant during the process.
- the alloy steel part 90 is a component part of a power transmission device such as a clutch in a self-propelled vehicle.
- the surface reforming apparatus 100 for alloy steel parts 90 according to the present invention can be widely applied to machine parts made of alloy steel.
- the surface reforming apparatus 100 for the alloy steel part 90 according to the present invention has a tapered shape with a sharp tip, for example, a cone shape, an acute angle, a right angle or an obtuse angle, and a diameter of 8 mm.
- it is preferable that a thick and uniform compound layer can be formed even on an alloy steel part 90 including at least one of holes of preferably 5 mm or less, more preferably 4 mm or less.
- the alloy steel part 90 in which all or part of the alloy steel part 90 has a mechanically sliding portion is formed by the surface reforming apparatus 100 for the alloy steel part 90 according to the present invention.
- the hardened layer (compound layer) is formed more easily and in a shorter time than the hardened layer by the conventional hardened layer forming treatment, specifically, the hardened layer by the hard chrome plating treatment after induction hardening or carburizing hardening. It can be effective.
- the surface reformer 100 is an atmosphere in which the alloy steel part 90 is maintained at a constant ammonia gas concentration of 80% and a temperature of the main chamber 101a of 620 ° C. for at least 180 minutes. Exposed inside. This is because, according to experiments by the present inventors, it has been confirmed that the effect of the present invention cannot be sufficiently exhibited when the surface modification treatment to the alloy steel part 90 is less than 180 minutes. Therefore, the surface reforming apparatus 100 needs to expose the alloy steel part 90 to an atmosphere in which the ammonia gas concentration is maintained at 80% or more and the temperature is maintained at 610 ° C. or more and 630 ° C. or less for at least 180 minutes.
- the surface modification method for alloy steel parts according to the present invention can be widely applied to alloy steel materials containing nitride-forming elements.
- the alloy steel material containing a nitride-forming element is a steel material containing at least one of chromium, molybdenum and aluminum in a minimum amount determined by the JIS standard (Japanese Industrial Standard), for example, chromium alloy steel, chromium In addition to molybdenum steel and nitride steel, there are carbon steel, chromium alloy steel or chromium molybdenum steel containing 0.1 to 0.3 wt% of aluminum.
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Abstract
Description
次に、上記のように構成した表面改質装置100を用いた合金鋼製部品90への表面改質処理について図3に示す工程流れ図を参照しながら説明する。ここで図3は、合金鋼製部品90を製造する製造工程を示す流れ図である。
100…表面改質装置、
101…処理炉、101a…主室、101b…待機室、101c…開閉扉、101d…仕切り壁、101e…搬送機構、102…加熱器、103…メインガス供給管、104…流量調整器、105…メインガスボンベ、106…サブガス供給管、107…流量調整器、108…サブガスボンベ、109…排気管、110…排ガス処理装置、111…制御装置、112a…温度センサ、112b…濃度センサ。
Claims (7)
- 窒化物形成元素を含む合金鋼材からなる合金鋼製部品の表面改質を行う合金鋼製部品の表面改質装置であって、
アンモニアガスの濃度が80%以上かつ温度が610℃以上ないし630℃以下の雰囲気中に前記合金鋼製部品を少なくとも180分以上曝して表面を改質する表面改質処理手段を備えていることを特徴とする合金鋼製部品の表面改質装置。 - 請求項1に記載した合金鋼製部品の表面改質装置において、
前記表面改質処理手段は、
前記温度が620℃であることを特徴する合金鋼製部品の表面改質装置。 - 請求項1または請求項2に記載した合金鋼製部品の表面改質装置において、
前記合金鋼製部品は、
尖った形状の角部および直径が8mm以下の孔部のうちの少なくとも一方を含むことを特徴とする合金鋼製部品の表面改質装置。 - 窒化物形成元素を含む合金鋼材からなる合金鋼製部品の表面改質方法であって、
アンモニアガスの濃度が80%以上かつ温度が610℃以上ないし630℃以下の雰囲気中に前記合金鋼製部品を少なくとも180分以上曝して表面を改質する表面改質処理工程を含むことを特徴とする合金鋼製部品の表面改質方法。 - 請求項4に記載した合金鋼製部品の表面改質方法において、
前記表面改質処理工程は、
前記温度が620℃であることを特徴する合金鋼製部品の表面改質方法。 - 請求項4または請求項5に記載した合金鋼製部品の表面改質方法において、
前記合金鋼製部品は、
尖った形状の角部および直径が8mm以下の孔部のうちの少なくとも一方を含むことを特徴とする合金鋼製部品の表面改質方法。 - 窒化物形成元素を含む合金鋼材からなる合金鋼製部品の製造方法であって、
アンモニアガスの濃度が80%以上かつ温度が610℃以上ないし630℃以下の雰囲気中に前記合金鋼製部品を少なくとも180分以上曝して表面を改質する表面改質処理工程を含むことを特徴とする合金鋼製部品の製造方法。
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