CN114309443A

CN114309443A - Preparation method of 6061T6 forged ring

Info

Publication number: CN114309443A
Application number: CN202111646041.4A
Authority: CN
Inventors: 陈丽芳; 张成元; 王正安; 林海涛
Original assignee: Southwest Aluminum Group Co Ltd
Current assignee: Southwest Aluminum Group Co Ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-04-12

Abstract

The invention provides a preparation method of a 6061T6 forged ring, which comprises the following steps: A) heating a 6061T6 blank to 460-480 ℃, and reaming the heated blank at 430-480 ℃ to obtain a ring blank, wherein the deformation of the reaming is 45-55% of the final diameter of a 6061T6 forged ring; B) and heating the ring blank to 230-250 ℃, and then reaming again at the temperature of more than or equal to 150 ℃ to obtain a 6061T6 forged ring. According to the characteristics of 6061 alloy, the invention prepares a novel reaming technology meeting the requirements of fine grains and high performance, the low-power grain size is refined to the first level, the allowance is greatly improved compared with American standard ASTMB247, and the performance is improved by 40-80%.

Description

Preparation method of 6061T6 forged ring

Technical Field

The invention relates to the technical field of aluminum alloy processing, in particular to a preparation method of a 6061T6 forged ring.

Background

The main alloying elements of 6061 aluminum alloy are magnesium and silicon, and form the Mg2Si phase; if manganese and chromium are contained in certain amounts, the negative effect of iron can be neutralized; sometimes, a small amount of copper or zinc is added to improve the strength of the alloy without obviously reducing the corrosion resistance; possibly also containing small amounts of copper to counteract the adverse effect of titanium and iron on the conductivity; the zirconium or titanium can refine grains and control a recrystallization structure; lead and bismuth may be added to improve machinability. 6061-T6 is the primary alloy for the 6-series alloy, which is a high quality aluminum alloy product subjected to a heat treatment pre-stretching process.

The 6061T6 forged ring is usually prepared by a reaming process, but the 6061T6 forged ring obtained by the conventional reaming process has coarse grains, the low-magnification grain size is 5-7 grades, and the structure difference is large, so that the performance difference of different positions in the forged ring is large. Therefore, for 6061T6 forged rings with special requirements, the performance requirements cannot be met by adopting the traditional broaching process technology.

Disclosure of Invention

The invention aims to provide a preparation method of a 6061T6 forged ring, and the 6061T6 forged ring prepared by the preparation method has fine crystal grains and better mechanical property.

In view of the above, the present application provides a method for preparing a 6061T6 forged ring, comprising the following steps:

A) heating a 6061T6 blank to 460-480 ℃, and reaming the heated blank at 430-480 ℃ to obtain a ring blank, wherein the deformation of the reaming is 45-55% of the final diameter of a 6061T6 forged ring;

B) and heating the ring blank to 230-250 ℃, and then reaming again at the temperature of more than or equal to 150 ℃ to obtain a 6061T6 forged ring.

Preferably, in the step A), the heating heat preservation time is more than or equal to 220 min.

Preferably, step a) further comprises:

heating the mold to 430-460 ℃, and keeping the temperature for more than or equal to 10 hours; the use temperature of the die is 250-420 ℃.

Preferably, in the step A), the final forging temperature of the hole expanding is more than or equal to 380 ℃, and the forging number of the hole expanding is 1 fire.

Preferably, in the step B), the heating heat preservation time is more than or equal to 220 min.

Preferably, step B) further comprises:

heating the die to 280-320 ℃ for more than or equal to 10 hours; the use temperature of the die is 150-250 ℃.

Preferably, in the step B), the final forging temperature of the hole expanding is more than or equal to 150 ℃, and the forging number of the hole expanding is 1 fire.

Preferably, the die is a small flat anvil.

The application provides a preparation method of a 6061T5 forged ring, which comprises the steps of firstly heating a 6061T6 blank to 460-480 ℃, reaming the heated blank at 430-480 ℃ to obtain a ring blank, wherein the reaming deformation is 45-55% of the final diameter of a 6061T6 forged ring; and heating the ring blank to 230-250 ℃, and reaming again at the temperature of more than or equal to 150 ℃ to obtain a 6061T6 forged ring. The application adopts a unique reaming blank-making method combining high-temperature large deformation and medium-temperature small deformation, and is favorable for obtaining forging rings with fine grain sizes, and experimental results show that the novel reaming process technology provided by the application has the advantages that the low-power grain size refinement is 1 grade, the allowance is greatly improved relative to American standard ASTMB247, and the mechanical property is improved by 40-80%.

Drawings

FIG. 1 is a photograph of 6061T6 forged ring macrostructures prepared according to example 1 of the present invention;

FIG. 2 is a photograph of the macrostructure of 6061T6 forged ring prepared in comparative example 1.

Detailed Description

For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.

Aiming at the technical problems that the crystal grain of the traditional 6061T6 forged ring is coarse and the low-magnification crystal grain size is 5-7 grade in the prior art, the application provides a preparation method of a 6061T6 forged ring, which adopts a unique hole expanding to blank method combining high-temperature large deformation and medium-temperature small deformation, so that the prepared 6061T6 forged ring has the low-magnification crystal grain size of one grade, the margin is greatly improved relative to American standard ASTMB247, and the performance is improved by 40-80 percent. Specifically, the embodiment of the invention discloses a preparation method of a 6061T6 forged ring, which comprises the following steps:

In the preparation process of 6061T6 forged ring, this application reaming flow includes: first heating, first hole expanding, second heating and second hole expanding; for the first heating, the 6061T6 blank is firstly heated to 460-480 ℃, the heat preservation time is more than or equal to 220min, the small flat anvil of the reaming die is also heated to 430-460 ℃, and the heating time is more than or equal to 10 h.

According to the invention, after the preparation work is finished, the blank is subjected to hole expanding forging, in the first hole expanding process, the using temperature of a die is 250-420 ℃, the open forging temperature is 430-480 ℃, the finish forging temperature is more than or equal to 380 ℃, and the forging fire number is 1 fire. In the process, the deformation amount of the broaching hole is 45-55% of the final diameter of the 6061T6 forged ring. This amount of deformation helps to improve the forged ring performance.

Then, the ring blank is heated for the second time, namely the ring blank is heated to 230-250 ℃, and the heat preservation time is more than or equal to 220 min; and heating the die to 280-320 ℃ for more than or equal to 10 hours. The low-temperature heating is beneficial to refining crystal grains, improving the performance and the uniformity of the structure and improving the performance of the forged ring.

And finally carrying out secondary hole expanding on the ring blank after secondary heating, wherein the using temperature of the die is 150-350 ℃, the forging opening temperature of the secondary hole expanding is 200-240 ℃, the finish forging temperature is not less than 150 ℃, and the forging heating time is 1 fire.

The application provides a preparation method of a 6061T6 forged ring, which can achieve the purposes of refining crystal grains and obviously improving the mechanical property of the forged ring by utilizing a novel broaching process.

For further understanding of the present invention, the following examples are provided to illustrate the preparation method of 6061T6 forged ring, and the scope of the present invention is not limited by the following examples.

Example 1

6061T6 forged ring specification

Obtaining the forging reaming process flow with the specification: first heating → first reaming → second heating → second reaming; the method comprises the following specific steps:

1) first heating

Heating the blank: the temperature is 470 +/-10 ℃, and the heat preservation time is not less than 220 min;

on the small flat anvil (upper flat anvil for engraving resistance groove),

core rod: heating at a constant temperature of 450 ℃ for more than or equal to 10 h;

2) first time ring expanding

The using temperature of the die is 250-420 ℃, the ring blank forging temperature is 430-480 ℃, the finish forging temperature is more than or equal to 380 ℃, and the forging times are as follows: 1, fire;

for small flat anvils (upper flat anvils for carving resistance grooves)

Reaming the mandrel holder to diameter

Uneven end surfaces after hole expansion;

3) second heating

Heating temperature of ring blank: 240 +/-10 ℃, constant temperature of 240 ℃, and heat preservation time of not less than 220 min;

on the small flat anvil (upper flat anvil for engraving resistance groove),

mandrel (resistance groove-engraved mandrel): heating at a constant temperature of 300 ℃ for more than or equal to 10 h;

4) second time ring expanding

The using temperature of the die is 150-250 ℃, the ring blank is 200-240 ℃, the finish forging temperature is more than or equal to 150 ℃, and the forging times are as follows: 1, fire;

for small flat anvils (upper flat anvils for carving resistance grooves)

Reaming the mandrel (mandrel for engraving resistance groove) saddle, controlling the size by a sample plate, and controlling the size of the sample plate

Thick aluminum plate, uneven terminal surface after reaming.

Comparative example 1

The same preparation method as the embodiment is different from the following steps: directly obtaining a ring blank with the final size requirement by primary reaming in the step 2), wherein the reaming deformation is 100% of the final diameter of the 6061T6 forged ring, and the steps 3) and 4) are omitted);

TABLE 1 Performance data Table for 6061T6 forged rings prepared in accordance with the present application and prior art method

Note: the actual statistical performance data in table 1 is that of a large batch of forged rings, and the performance of the forged rings prepared in comparative example 1 just met the performance data of the U.S. standard.

The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A preparation method of a 6061T6 forged ring comprises the following steps:

2. The preparation method according to claim 1, wherein the heating is performed for 220min or more in step A).

3. The method according to claim 1, wherein the step a) further comprises:

4. The preparation method of claim 1, wherein in the step A), the final forging temperature of the hole expanding is not less than 380 ℃, and the forging number of the hole expanding is 1 fire.

5. The preparation method according to claim 1, wherein the heating in step B) is carried out for a holding time of 220min or more.

6. The method according to claim 1, wherein the step B) further comprises:

7. The preparation method according to claim 1, wherein in the step B), the finish forging temperature of the hole expanding is not less than 150 ℃, and the forging number of the hole expanding is 1 fire.

8. The method of claim 3 or 6, wherein the die is a small flat anvil.