JP3606502B2 - Carburizing method and carburizing jig used in the carburizing method - Google Patents

Description

表１から明らかなように、防炭剤を塗布した従来例の鍔部の硬度がＨｖ３３０であるのに対して、本願発明の防炭剤塗布及び該防炭剤部分を鋼製の浸炭治具で覆った場合はＨｖ２８０であり、同じ処理条件のもとで硬度上昇が抑えられていることが確認されたものである。
【００２７】
また、歪み量の変化は下記表２の通りである。
【００２８】
【表２】

前記鍔部の機械加工必要部分は浸炭処理後に切削加工が行われるが、その場合の切削しろは０．１ｍｍであり、従来例では切削しろより歪み量が小さくなることがなく、実質的に切削加工が不可能となる場合があった。
【００２９】
前記従来例に対し、本発明によれば、表２に示すごとく、歪み量が切削しろの範囲内に収まり、切削加工がが可能であることが確認されたものである。
【００３０】
【発明の効果】
本発明の浸炭方法によれば、浸炭処理後に機械加工を必要とする部分によって構成された空間部を有する機械部品の前記空間部の硬度上昇を有効に防止することができ、該空間部の硬度上昇の防止を浸炭治具を利用して有効に行うことができ、さらには前記浸炭処理後に機械加工を必要とする部分によって構成された空間部を有する機械部品の自重変形を前記浸炭治具により有効に防止できる。
以上
【図面の簡単な説明】
【図１】機械部品の一例としてのハブの縦断面図である。
【図２】図１のハブを治具にセットした状態を示す縦断面図である。
【図３】図１のハブを治具にセットした状態を示す他の実施の形態を示す縦断面図である。
【図４】浸炭処理工程図である。
【図５】従来のハブの段取り状態を示す縦断面図である。
【符号の説明】
１ ハブ（機械部品）
３ 鍔部
４ 防炭剤塗布部分
５ 耐熱性のある鋼製等の剛体の浸炭治具[0001]
The present invention relates to a carburizing method for a machine part having a space portion formed by a portion that requires machining later, and a carburizing jig used for the carburizing method.
[0002]
[Prior art]
Conventionally, carburizing treatment of machine parts is generally performed by placing the machine parts directly on a jig having various heat resistances. Accordingly, the hardness of the entire surface is increased by carburizing and quenching, and it becomes difficult or very laborious to perform machining when it is necessary to machine a part of the surface later.
[0003]
Therefore, in the carburizing process, a carburizing process is performed by applying a carburizing agent to a part that requires machining later. However, even in the portion where the carburizing agent is applied, the surface hardness is increased by the subsequent quenching, and the subsequent machining may be difficult.
[0004]
Further, when the machine part has a space portion constituted by a portion that requires machining later, for example, in carburizing processing of a hub or the like, due to the weight of the upper portion of the space portion during the high-temperature carburizing processing. The problem remains that the space and other overall shapes are deformed.
[0005]
[Problems to be solved by the invention]
This invention is made in view of the said situation, and provides the carburizing method which prevents effectively the hardness increase of the said space part of the machine part which has the space part comprised by the part which requires a machining after a carburizing process. and this, and the object thereof is to provide a carburizing jig to effectively prevent the self-weight deformation during carburizing treatment machine parts having a space portion configured by a portion requiring machined after Raniwa the carburized To do.
[0006]
[Means for Solving the Problems]
In the present invention, carburizing agent is applied to the machining required parts of the machine parts requiring machining after the carburizing, even at least a portion of-proof coal agent application portion of the steel or the like having heat resistance It is processed covered by a jig rigid.
[0007]
As described above, a carburizing agent is applied in advance to the machining required part, and further, at least a part of the carburizing agent application part is covered with a rigid carburizing jig such as steel having heat resistance, The influence of the carburizing atmosphere and the quenching oil can be minimized to effectively prevent the increase in the hardness of the necessary machining portion.
[0008]
Furthermore, before Symbol carburizing jig is shaped to cover the anti-carburizing agent application portion. This immersion TanOsamugu is not only because of the setup of mere mechanical parts, is shall be used as a carburizing control member.
[0009]
The carburizing method of the present invention is a carburizing method of a machine part having a space portion formed by a part that needs to be machined later, and simply carburizing the hardened body such as heat-resistant steel on the part where the carburizing agent is applied. This is a carburizing method in which not only covering with a tool but simultaneously supporting a mechanical part through the space by the carburizing jig. According to the carburizing method , it is possible to prevent the deformation due to the weight of the machine part during the carburizing high-temperature treatment as well as the carburizing control of the necessary machining portion.
[0010]
The invention of claim 2 relates to a carburizing jig used for carrying out the invention of the carburizing method of claim 1 , and uses the carburizing jig as a carburizing control member and prevents deformation of machine parts during carburizing high-temperature processing. It is used as a member.
[0011]
The invention of claim 3 is a carburizing method of a hub for a torque converter as an example of a machine part having a space portion surrounded by a portion requiring machining after claim 1 , and details thereof will be described later as an embodiment. To state.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The drawings show an embodiment of the present invention, FIG. 1 is a longitudinal sectional view of a hub as an example of a machine part, FIG. 2 is a longitudinal sectional view showing a state where the hub of FIG. 1 is set in a carburizing jig, FIG. 3 is a longitudinal sectional view showing another embodiment showing a state in which the hub of FIG. 1 is set on a carburizing jig, FIG. 4 is a carburizing process diagram, and FIG. 5 is a conventional view showing a setup state of the hub.
[0013]
The hub 1 includes a cylindrical portion 2 that requires carburization and a portion that requires subsequent machining, specifically, a space portion 3 a that is configured by a flange portion 3. Therefore, it is conceivable to apply a carburizing agent 4 to the upper surface portion 3b of the flange 3 shown by hatching in FIG.
[0014]
Further, conventionally, when carburizing the hub 1 of the shape, from the viewpoint of stability as shown in FIG. 5, it has been performed carburization and setup on the upper surface of the net 7 in the space portion 3a downward.
[0015]
However, deformation starts due to high-temperature heating during the carburizing process, and the cylindrical part 2 of the upper part of the space part 3a is lowered by its own weight, and as shown by the phantom line in the drawing, As a result, the outer peripheral edge of the collar portion 3 was deformed into a raised shape.
[0016]
Therefore, in the carburizing method of the present invention, as shown in FIG. 2, the part that needs to be machined later, that is, the space part 3a of the flange part 3 to which the carburizing agent 4 is applied is made of heat-resistant steel or the like. The carburizing process is performed by covering with a rigid carburizing jig 5.
[0017]
In the embodiment of the drawings, the carburizing jig 5 covers not only the space portion 3a of the flange portion 3 but also the peripheral edge portion, but only the space portion 3a constituted by a portion requiring machining later. It's okay.
[0018]
In the center of the carburizing jig 5, a hole having a diameter that further prevents the cylindrical part 2 from descending so that the carburizing atmosphere and quenching oil reach the inside of the cylindrical part 2 that needs to be carburized. 6 is provided.
[0019]
That is, as shown in FIG. 2, the hole 6 has the same diameter as the inner diameter of the cylindrical portion 2 or slightly smaller than the inner diameter of the cylindrical portion 2, and is configured to support the entire cylindrical portion 2. Is done. But the support of the said cylindrical body 2 may be a part of space part 3a, as shown in FIG.
[0020]
As described above, the machining required portion, that is, the coated portion of the carburizing agent 4 is covered with the carburizing jig 5, and the heating and quenching treatment in the carburizing atmosphere is performed, thereby suppressing the increase in the hardness of the machining required portion, Subsequent machining is facilitated.
[0021]
Furthermore, as described above, the carburizing jig 5 not only covers the space portion 3a to which the carburizing agent 4 of the collar portion 3 requiring subsequent machining is applied, but also the carburizing jig 5 simultaneously uses the carburizing agent 4. It is preferable to carry out heating and quenching in a carburizing atmosphere while supporting the whole or a part thereof through the space portion 3a coated with.
[0022]
That is, even when high-temperature heating is performed in a carburizing atmosphere arranged on the upper surface of the net 7 in the state shown in FIGS. 2 and 3, the jig 5 prevents the cylindrical portion 2 from being lowered by its own weight, and is later machined. The deformation of the space portion 3a and the entire shape that require the above is prevented.
[0023]
【Example】
Before and after carburizing treatment in the set-up state of the present invention shown in FIG. 2 (coating with a carburizing agent and using a steel jig) and the conventional set-up state shown in FIG. The hardness change of each part is shown in Table 1 below.
The processing conditions are as follows.
[0024]
Parts: Hub (cylindrical part: carburized, buttocks: non-carburized)
Material: SCR415
Treatment method: carburizing, quenching and tempering treatment process: treatment time and treatment temperature are as shown in FIG.
[0025]
Carbon protection agent: Sodium silicate, mainly copper powder 【0026】
[Table 1]

As is apparent from Table 1, the hardness of the heel portion of the conventional example coated with a carburizing agent is Hv330, whereas the carburizing agent application and the carburizing agent part of the present invention are made of a steel carburizing jig. When it is covered with Hv280, it is confirmed that the increase in hardness is suppressed under the same processing conditions.
[0027]
Further, the change in distortion amount is as shown in Table 2 below.
[0028]
[Table 2]

The machined portion of the heel portion is cut after carburizing. In this case, the cutting margin is 0.1 mm. In the conventional example, the amount of distortion is not smaller than that of the cutting margin, and the cutting portion is substantially cut. In some cases, processing was impossible.
[0029]
Compared to the conventional example, according to the present invention, as shown in Table 2, it was confirmed that the amount of strain was within the range of the cutting margin and that cutting was possible.
[0030]
【The invention's effect】
According to the carburizing method of the present invention, it is possible to effectively prevent the increase in hardness of the space portion of the machine component having a space portion configured by a portion that requires machining after the carburizing, the hardness of the space The prevention of the rise can be effectively performed by using the carburizing jig, and further, the carburizing jig allows the self-weight deformation of the machine part having the space portion constituted by the part requiring machining after the carburizing process. It can be effectively prevented.
[Brief description of drawings]
FIG. 1 is a longitudinal sectional view of a hub as an example of a machine part.
FIG. 2 is a longitudinal sectional view showing a state in which the hub of FIG. 1 is set on a jig.
3 is a longitudinal sectional view showing another embodiment showing a state in which the hub of FIG. 1 is set on a jig. FIG.
FIG. 4 is a carburizing process diagram.
FIG. 5 is a longitudinal sectional view showing a setup state of a conventional hub.
[Explanation of symbols]
1 Hub (machine parts)
3 Hook 4 Carbide coated part 5 Heat-resistant steel carburizing jig

Claims (3)

A space portion configured by a portion that requires machining after mechanical parts, carburizing agent coated carburizing jig rigid steel such as a heat resistance carburizing agent application portion of the space portion and at least the mechanical part the charcoal method immersion you characterized in that the support and handle part of the upper structure portion of the spatial portion of the covering by. The machine part has a space part formed by a part that needs to be machined later, covers at least a part of the part where the carburizing agent is applied in the space part, and at the same time, a component part on the upper part of the space part of the machine part A rigid carburizing jig made of heat-resistant steel or the like for use in the carburizing method according to claim 1 . The carburizing method according to claim 1 , wherein the machine component having a space portion formed by a portion that requires machining later is a torque converter.

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