JP2006289394A - METHOD FOR MANUFACTURING RING MADE OF Mn-Cu ALLOY - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method which can economically manufacture a ring having excellent dimensional accuracy from an Mn-Cu alloy material. <P>SOLUTION: In the method for manufacturing the ring from the Mn-Cu alloy material, the Mn-Cu alloy material is processed by cold forging, comprising swaging, forming, and punching so as to get a ring material, and then the ring material is processed by cold rolling to obtain the ring having a required size. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for producing an Mn—Cu alloy ring, and more particularly to an improvement in a method for producing a ring from a Mn—Cu alloy material by plastic working.

  Conventionally, when a ring is manufactured from a cut piece of an alloy material, for example, an alloy round bar, a method is known in which the cut piece is placed and subjected to hot forging for forming and punching to obtain a ring of a required size. (For example, refer to Patent Document 1). Also, conventionally, when a ring is manufactured from an alloy ring material, a method is also known in which the alloy ring material is subjected to cold rolling (CRF) to obtain a ring of a required size ( For example, see Patent Document 2).

However, the conventional method in which the alloy material is subjected to hot forging as described above to form a ring of a required size has relatively few problems when the alloy material is an iron-based alloy material. When the material is a Mn-Cu alloy material, the temperature range in which hot forging can be performed may be narrower than that of an iron alloy material. It is difficult to make a ring of the required size by subjecting it to hot forging, and it is necessary to have a suitable heat treatment facility for hot forging and its management, and because a lot of punching waste is generated, the yield is low, especially There is a problem that the dimensional accuracy of the obtained ring is poor. Further, a ring material of a required size is obtained by subjecting a cut piece of a Mn-Cu alloy material, for example, a round bar made of Mn-Cu alloy, to hot forging to form a ring material, and then subjecting the ring material to cold rolling. In this case, although there is a corresponding improvement, there is still a problem that a corresponding heat treatment facility and its management are still necessary, and the dimensional accuracy of the resulting ring is poor.
JP-A-10-118737 Japanese Patent Laid-Open No. 2001-9552

  The problem to be solved by the present invention is to provide a method capable of economically producing a ring with good dimensional accuracy from an Mn—Cu based alloy material.

  The present invention that solves the above-mentioned problems is a method of manufacturing a ring from an Mn-Cu alloy material, after placing the Mn-Cu alloy material into a ring material by subjecting it to cold forging for forming and punching, The present invention relates to a method for producing a ring made of a Mn—Cu alloy, wherein the ring material is subjected to cold rolling to obtain a ring having a required size.

  In the present invention, first, an Mn—Cu-based alloy material is placed and subjected to cold forging by forming and punching to obtain a ring material. The composition of the Mn—Cu-based alloy used as a raw material is not particularly limited as long as it is based on Mn and contains a large amount of Cu next to Mn. Typically, the ring of the required size manufactured according to the present invention is used. Because of the relationship of imparting vibration damping performance and using the ring shape almost as it is, based on Mn, it contains 20 ± 5% Cu, 5 ± 3% Ni, 2 ± 1% Fe and 5 ± 3% Fe. The thing containing 2 to 5% of Al is further preferable. In the present invention, a cut product obtained by cutting, for example, a round bar made of Mn—Cu alloy in the radial direction is used as the Mn—Cu alloy material.

  In the present invention, the Mn—Cu alloy material as described above is placed and subjected to cold forging by forming and punching to obtain a ring material. For example, a cut piece of a Mn—Cu alloy round bar is placed in a slightly flat shape, further formed into a container shape having a concave cross section, and then punched to form a ring material. It goes without saying that such a ring material has a smaller outer diameter and inner diameter than a ring of the required size obtained by further cold rolling it. In the cold forging as described above, before for upsetting, between upsetting and forming, between the forming and punching, the cold forging such as Mn-Cu alloy material is appropriately solution treated. You can also.

  Next, in the present invention, the cold forged ring material as described above is subjected to cold rolling to obtain a ring having a required size. Cold rolling itself can be performed in accordance with a conventional method of shaping while rotating the mandrel while rotating the mandrel in a state where the mandrel is in contact with the ring material caught on the forming roll. In the present invention, prior to the above-described cold forging upsetting and / or prior to cold rolling after cold forging, in order to remove the processing distortion of the material round bar and cold forging. In addition, in order to reduce the martensite phase (twinning) and α phase, the Mn—Cu alloy material and the cold forged ring material are held at a temperature range of 700 to 900 ° C. for 0.5 to 4 hours, for example. It is preferable to perform a solution treatment for rapid cooling.

  The ring of the required size thus obtained typically imparts damping performance to the ring and can be used in an almost intact ring shape. In this case, the vibration damping performance can be imparted according to a conventional method for heating and annealing, and a cold-rolled ring having a required size is heated in a temperature range of 800 to 1100 ° C. Thereafter, it is cooled at a constant rate of 0.85 to 1.65 ° C./min, or is heated and held in a temperature range of 700 to 900 ° C., followed by solution treatment, followed by heating and heating in a temperature range of 350 to 650 ° C. It is preferable to carry out by holding and aging treatment.

  In the present invention described above, when manufacturing a ring of a required size from an Mn-Cu alloy material, the corresponding heat treatment equipment and its management as in the case of hot forging are not necessary, and hot forging is also necessary. Compared to the case, the yield is high because the amount of punching waste generated is small. Therefore, these are combined and economical as a whole, and the dimensional accuracy of the obtained ring is particularly good.

  FIG. 1 is a process diagram schematically showing an embodiment of the present invention in cross section. In FIG. 1, a cut 1 of a round bar made of Mn—Cu alloy is subjected to a solution treatment, and then subjected to cold forging of upsetting, forming and punching. In the upsetting, a short cylindrical cut object 1 that has been lubricated is installed into a flat object 2, and in the forming, the flat object 2 is formed into a container 3 having a concave cross section. The bottom of the container 3 is punched out to form a ring material 4. In FIG. 1, after the ring material 4 is subjected to a solution treatment, it is subjected to cold rolling to form a ring 5 having a required size that has an outer diameter and an inner diameter larger than the ring material 4 and is thin.

Example 1
According to the process diagram described above with reference to FIG. 1, a ring was manufactured under the following conditions.
Mn-Cu alloy material: A cut piece of an alloy round bar having the composition of Mn-20Cu-5Ni-2Fe in atomic%, and a cut piece having an outer diameter of 34 mm and a height of 42.2 mm at 820 ° C. What was heated and held for 1 hour and subjected to a solution treatment was used.
Cold forging: After the above cut product is lubricated, it is placed in a flat product with a set value of 60 mm in outer diameter, then molded into a container with the same set value, and the bottom is punched to set value Is a ring material having an outer diameter of 60 mm and an inner diameter of 40 mm.
Cold rolling: The ring material was heated and held at 820 ° C. for 1 hour for solution treatment, and then cold rolled into a ring having a set value of 82 mm outer diameter and 72 mm inner diameter.
No special heat treatment furnace capable of high-accuracy temperature control is required, and the yield is high due to the small amount of punching waste. Therefore, they combine to produce a ring with high dimensional accuracy. We were able to.

Comparative Example 1
Using a Mn—Cu based alloy material having the same dimensions as in Example 1, heating this to 1100 ° C., and producing a ring having the same inner and outer diameters as in Example 1 by hot forging of upsetting, forming and punching Although an attempt was made, a part of the Mn—Cu alloy material was melted by the initial heating, and the hot forging itself could not be performed.

Comparative Example 2
A ring having the same inner and outer diameters as in Example 1 was manufactured by using a Mn—Cu alloy material having the same dimensions as in Example 1 and heating it to 850 ° C. to perform hot forging by upsetting, forming, and stamping. . A special heat treatment furnace capable of high-accuracy temperature control is required, and the yield is low due to the large amount of punching waste. Therefore, they are combined to be uneconomical as a whole. It was bad.

Comparative Example 3
After using a Mn—Cu based alloy material having the same dimensions as in Example 1 and heating it to 850 ° C. and setting it to the same ring material as in Example 1 by hot forging by upsetting, forming and punching Further, it was subjected to cold rolling to produce a ring having the same inner and outer diameters as in Example 1. Although a special heat treatment furnace capable of high-precision temperature control was required, the yield was high due to the small amount of punching waste generated, and the dimensional accuracy of the manufactured ring was somewhat poor.

Comparative Example 4
A ring having the same inner and outer diameters as in Example 1 was manufactured by cold forging by upsetting, forming and punching using the same Mn—Cu alloy material as in Example 1. A special heat treatment furnace capable of high-precision temperature control was not required, but a large press was required, and the yield was low due to the large amount of punching scraps. However, the dimensional accuracy of the manufactured ring was good.
Table 1 summarizes the dimensional accuracy of the rings manufactured in each of the above examples. Separately, the same production test was performed on a cut piece of an alloy round bar having the composition of Mn-20Cu-5Ni-2Fe-2Al in atomic%, but the results were almost the same.

The process figure which shows the implementation state of this invention schematically in a cross section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cut of Mn-Cu alloy round bar 2 Flat object 3 Container 4 Ring material 5 Ring

Claims (6)

  In a method of manufacturing a ring from an Mn-Cu alloy material, the Mn-Cu alloy material is upset, subjected to cold forging by forming and punching to form a ring material, and then the ring material is subjected to cold rolling. A method for producing a ring made of Mn—Cu alloy, characterized in that the ring has a required size.   The method for producing a ring made of Mn-Cu alloy according to claim 1, wherein the Mn-Cu alloy material is subjected to solution treatment and then subjected to cold forging.   The method for producing a ring made of Mn-Cu alloy according to claim 1 or 2, wherein the ring material is subjected to solution rolling and then subjected to cold rolling.   The manufacturing method of the ring made from Mn-Cu type alloy as described in any one of Claims 1-3 which performs further heat processing to what was made into the ring of a required magnitude | size, and provides damping performance to this ring.   5. The Mn—Cu based alloy material is based on Mn and contains, in atomic percent, 20 ± 5% Cu, 5 ± 3% Ni, and 2 ± 1% Fe. The manufacturing method of the ring made from Mn-Cu type alloy as described in one term. The Mn-Cu alloy material is based on Mn and contains, in atomic%, 20 ± 5% Cu, 5 ± 3% Ni, 2 ± 1% Fe, and 2-5% Al. The manufacturing method of the ring made from Mn-Cu type alloy as described in any one of claim | item 1 -4.

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