CN109702030B - Frequency-stabilizing medium-strength aluminum profile production process and application of aluminum profile - Google Patents
Frequency-stabilizing medium-strength aluminum profile production process and application of aluminum profile Download PDFInfo
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Abstract
The invention discloses a production process of a frequency-stabilized medium-strength aluminum profile, which comprises the following steps of: (1) forming the aluminum alloy rod into an aluminum profile through an extrusion die, and controlling the temperature of an extrusion outlet of the extrusion die at 515-525 ℃; (2) and carrying out artificial aging treatment on the formed aluminum profile to obtain an aluminum profile finished product, wherein the aging temperature of the artificial aging treatment is 185-200 ℃, and the aging time is 3.5-11.5 h. Correspondingly, the invention also discloses application of the aluminum profile prepared by the production process. The production process limits the outlet temperature of the extrusion die, ensures that the integral structure performance of the extruded aluminum profile tends to be consistent, and ensures the hardness value of the whole aluminum profile and the stability of audio. The hardness and the audio frequency of the aluminum profile are further improved by limiting the temperature and the time of artificial aging, and the quality of the aluminum profile is ensured. The aluminium section produced by the invention is made into keys of a bell, and the total sound effect of the bell can be improved.
Description
Technical Field
The invention relates to the technical field of aluminum profile manufacturing, in particular to a frequency-stabilized medium-strength aluminum profile production process and application of an aluminum profile.
Background
The chime belongs to a percussion instrument, and metal keys are placed on a wooden box, and a hammer is used for beating the keys to give a melody which is pleasant to the ears. The hammer is made of plastic, glass, metal or wood, and the keys are mainly made of steel. Along with the continuous expansion of the application field of aluminum alloy, the keys of the harmonica made of the aluminum alloy are developed.
The keys are key sounding components of the harmonica, and the quality of the keys determines the overall sounding effect of the harmonica. In general, the smaller the difference in tone frequency between two keys of the same size, the better the stability of the keys and the better the quality thereof. Related technical research and patents related to controlling the audio frequency of the aluminum alloy keys in China are few at present, and no targeted standard exists. In practical production application, the audio frequency difference range of the aluminum alloy keys is generally required to be controlled within +/-2 Hz, and great difficulty is brought.
In the prior art, most processes for producing aluminum profiles pay attention to the strength and hardness of the aluminum profiles, and no attention is paid to how to stabilize the audio frequency of the aluminum profiles.
Disclosure of Invention
The invention aims to provide a frequency-stabilized medium-strength aluminum profile production process, which is used for obtaining an aluminum profile with stable audio frequency and stable hardness by controlling process parameters.
The invention also aims to provide the application of the aluminum profile prepared by adopting the frequency-stabilizing medium-strength aluminum profile production process, and the aluminum profile is used for preparing keys of a harmonica and ensuring the integral generation effect of the harmonica.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production process of a frequency-stabilized medium-strength aluminum profile comprises the following steps:
(1) forming the aluminum alloy rod into an aluminum profile through an extrusion die, and controlling the temperature of an extrusion outlet of the extrusion die at 515-525 ℃;
(2) and carrying out artificial aging treatment on the formed aluminum profile to obtain an aluminum profile finished product, wherein the aging temperature of the artificial aging treatment is 185-200 ℃, and the aging time is 3.5-11.5 h.
When the aluminum alloy bar is formed, in the forward extrusion process, due to frictional heat generated by relative movement of the cast bar and the extrusion die, the temperature of an extrusion outlet can be gradually increased on the premise that the temperature of the cast bar, the extrusion speed and the temperature of the extrusion cylinder are not changed, so that the head, middle and tail structure properties of the extruded section bar are different, and the stability of audio frequency is influenced. The production process limits the outlet temperature of the extrusion die, ensures that the integral structure performance of the extruded aluminum profile tends to be consistent, and ensures the hardness value of the whole aluminum profile and the stability of audio. The artificial aging treatment is carried out on the aluminum profile, the structural performance of the aluminum profile is obviously influenced, the hardness and the audio frequency of the aluminum profile are further improved by limiting the temperature and time of the artificial aging, and the quality of the aluminum profile is ensured.
Further, the aging temperature is 195 ℃ and the aging time is 3.5 h. The aging time is shortened and the energy is saved by further limiting the temperature and time of artificial aging under the condition of ensuring the higher hardness and audio frequency of the aluminum profile.
Further, in the step (1), the temperature of the aluminum alloy rod is controlled to be 450-470 ℃. The aluminum alloy rod at the temperature is controlled to have proper softening degree, so that the tearing phenomenon is prevented, and a space for guiding heat generated by friction between the aluminum alloy and the extrusion die into the aluminum alloy rod is provided.
Further, in the step (1), the temperature of the extrusion die was 420 ℃. The temperature of the extrusion die is slightly lower than that of the aluminum alloy rod, so that the hardness of the extrusion die is higher than that of the aluminum alloy rod, the loss of the extrusion die in the working process is reduced, the extrusion die is prevented from being excessively fatigued, and the service life of the extrusion die is prolonged.
Further, in the step (1), the extrusion speed is controlled to be 30-35mm/s, and the speed of each aluminum profile during forming is that the front forming speed is greater than the tail forming speed. By controlling the extrusion speed, the heat generation quantity of the friction between the extrusion die and the aluminum alloy rod is controlled, and the quality of the formed aluminum profile is ensured.
Further, in the step (1), the extrusion die has only one die hole. When a porous extrusion die is used for production, due to the influence of die design, die machining, extrusion equipment and tooling, the metal flowing conditions, the discharging speed and the friction conditions in a plurality of die holes are not completely consistent, the structure performance of the section bar is influenced, and the audio frequency fluctuation of the head and the tail of a finished product is large. The invention adopts the single-hole extrusion die to ensure that the whole finished product has basically consistent audio frequency and improve the quality of the finished product.
Further, in the step (2), the audio frequency difference between the front end and the rear end of the finished aluminum profile is less than or equal to 4 Hz. Therefore, the whole audio frequency fluctuation of the finished aluminum profile is small, and the finished aluminum profile is a frequency-stabilized aluminum profile.
Further, the aluminum alloy bar is 6063-T5, and when the sample length of the aluminum alloy bar is 113.5 +/-0.1 mm, the audio frequency can be controlled between 1708Hz and 1712Hz, and the hardness is 74.7Hv-78.8 Hv. The frequency-stabilized medium-strength aluminum profile is prepared from a model 6063-T5 aluminum alloy, and is stable in audio frequency and high in hardness.
The aluminum profile prepared by the production process is used for manufacturing keys of a chime. The aluminum profile has the advantages that the audio frequency stability and hardness are high, the audio frequency difference of the prepared piano keys is within +/-2 Hz, the stability of the piano keys is good, and the overall sound production effect of the harmonica is improved.
The invention has the beneficial effects that:
the production process limits the outlet temperature of the extrusion die, ensures that the integral structure performance of the extruded aluminum profile tends to be consistent, and ensures the hardness value of the whole aluminum profile and the stability of audio. The artificial aging treatment is carried out on the aluminum profile, the structural performance of the aluminum profile is obviously influenced, the hardness and the audio frequency of the aluminum profile are further improved by limiting the temperature and time of the artificial aging, and the quality of the aluminum profile is ensured.
The invention further limits the temperature of the aluminum alloy bar, the temperature of the extrusion die, the extrusion speed and the number of die holes of the extrusion die, and improves the audio frequency stability and the hardness stability of the aluminum profile. The aluminium section produced by the invention is made into keys of a bell, and the total sound effect of the bell can be improved.
Detailed Description
The technical solution of the present invention will be further described with reference to the accompanying embodiments.
The invention relates to a production process of a frequency-stabilized medium-strength aluminum profile, which comprises the following steps of:
(1) forming the aluminum alloy rod into an aluminum profile through an extrusion die, and controlling the temperature of an extrusion outlet of the extrusion die at 515-525 ℃;
(2) and carrying out artificial aging treatment on the formed aluminum profile to obtain an aluminum profile finished product, wherein the aging temperature of the artificial aging treatment is 185-200 ℃, and the aging time is 3.5-11.5 h.
When the aluminum alloy bar is formed, in the forward extrusion process, due to frictional heat generated by relative movement of the cast bar and the extrusion die, the temperature of an extrusion outlet can be gradually increased on the premise that the temperature of the cast bar, the extrusion speed and the temperature of the extrusion cylinder are not changed, so that the head, middle and tail structure properties of the extruded section bar are different, and the stability of audio frequency is influenced. The production process limits the outlet temperature of the extrusion die, ensures that the integral structure performance of the extruded aluminum profile tends to be consistent, and ensures the hardness value of the whole aluminum profile and the stability of audio. The artificial aging treatment is carried out on the aluminum profile, the structural performance of the aluminum profile is obviously influenced, the hardness and the audio frequency of the aluminum profile are further improved by limiting the temperature and time of the artificial aging, and the quality of the aluminum profile is ensured.
Preferably, the aging temperature is 195 ℃ and the aging time is 3.5 h. The aging time is shortened and the energy is saved by further limiting the temperature and time of artificial aging under the condition of ensuring the higher hardness and audio frequency of the aluminum profile.
In the step (1), the temperature of the aluminum alloy bar is controlled to be 450-470 ℃, and the temperature of the extrusion die is 420 ℃. The aluminum alloy rod at the temperature is controlled to have proper softening degree, so that the tearing phenomenon is prevented, and a space for guiding heat generated by friction between the aluminum alloy and the extrusion die into the aluminum alloy rod is provided. The temperature of the extrusion die is slightly lower than that of the aluminum alloy rod, so that the hardness of the extrusion die is higher than that of the aluminum alloy rod, the loss of the extrusion die in the working process is reduced, the extrusion die is prevented from being excessively fatigued, and the service life of the extrusion die is prolonged.
In the step (1), the extrusion speed is controlled to be 30-35mm/s, and the speed of each aluminum profile during molding is that the molding speed of the front part is greater than that of the tail part. By controlling the extrusion speed, the heat generation quantity of the friction between the extrusion die and the aluminum alloy rod is controlled, and the quality of the formed aluminum profile is ensured.
In step (1), the extrusion die has only one die hole. When a porous extrusion die is used for production, due to the influence of die design, die machining, extrusion equipment and tooling, the metal flowing conditions, the discharging speed and the friction conditions in a plurality of die holes are not completely consistent, the structure performance of the section bar is influenced, and the audio frequency fluctuation of the head and the tail of a finished product is large. The invention adopts the single-hole extrusion die to ensure that the whole finished product has basically consistent audio frequency and improve the quality of the finished product.
In the step (2), the audio frequency difference between the front end and the rear end of the finished aluminum profile is less than or equal to 4 Hz. Therefore, the whole audio frequency fluctuation of the finished aluminum profile is small, and the finished aluminum profile is a frequency-stabilized aluminum profile.
The aluminum alloy bar is 6063-T5, and when the sample length of the aluminum alloy bar is 113.5 +/-0.1 mm, the audio frequency can be controlled between 1708Hz and 1712Hz, and the hardness is 74.7Hv-78.8 Hv. The frequency-stabilized medium-strength aluminum profile is prepared from a model 6063-T5 aluminum alloy, and is stable in audio frequency and high in hardness. It should be noted that the production method of the invention is also suitable for aluminum profiles of other models, and aluminum profiles with stable frequency and medium strength can be obtained.
The aluminum profile prepared by the production process is used for manufacturing keys of a chime. The aluminum profile has the advantages that the audio frequency stability and hardness are high, the audio frequency difference of the prepared piano keys is within +/-2 Hz, the stability of the piano keys is good, and the overall sound production effect of the harmonica is improved.
Experiment 1
The frequency-stabilizing medium-strength aluminum profile production process for the experiment comprises the following steps:
(1) forming an aluminum alloy bar into an aluminum profile through a single-hole extrusion die, wherein the temperature of the aluminum alloy bar is controlled to be 450-470 ℃, the temperature of the extrusion die is controlled to be 420 ℃, the extrusion speed is controlled to be 30-35mm/s, and the front forming speed is greater than the tail forming speed;
(2) and carrying out artificial aging treatment on the formed aluminum profile to obtain an aluminum profile finished product, wherein the aging temperature of the artificial aging treatment is 185-200 ℃, and the aging time is 3.5-11.5 h.
The aluminum profile is prepared by the production steps under the conditions of controlling the extrusion outlet temperature of the extrusion die and not controlling the extrusion outlet temperature. The temperature of the extrusion outlet is controlled to be 515-525 ℃, and when the temperature of the extrusion outlet is not controlled, the temperature of the extrusion outlet is detected to be 515-555 ℃. The audio frequencies of the head, middle and tail of the prepared aluminum profile were measured, and the results are shown in the following table.
As can be seen from the above table, when the extrusion outlet temperature is controlled to be 515-525 ℃, the audio frequency of the prepared aluminum profile is stable on the whole, and the quality is stable.
Experiment 2
The frequency-stabilizing medium-strength aluminum profile production process for the experiment comprises the following steps:
(1) forming an aluminum alloy rod into an aluminum profile through an extrusion die, wherein the temperature of an extrusion outlet is 515-525 ℃, the temperature of the aluminum alloy rod is controlled to be 450-470 ℃, the temperature of the extrusion die is 420 ℃, the extrusion speed is controlled to be 30-35mm/s, and the front forming speed is greater than the tail forming speed;
(2) and carrying out artificial aging treatment on the formed aluminum profile to obtain an aluminum profile finished product, wherein the aging temperature of the artificial aging treatment is 185-200 ℃, and the aging time is 3.5-11.5 h.
The aluminum profile is prepared by adopting the production steps of a single-hole extrusion die and a double-hole extrusion die. The audio frequencies of the head, middle and tail of the prepared aluminum profile were measured, and the results are shown in the following table.
From the above table, under the condition of using the single-hole die, the head-to-tail audio frequency difference of the aluminum profile is 4Hz, while the head-to-tail audio frequency difference of the two-hole die formed aluminum profile reaches 14Hz, and it can be seen that the audio frequency of the aluminum profile manufactured by using the single-hole extrusion die is stable.
Experiment 3
The frequency-stabilizing medium-strength aluminum profile production process for the experiment comprises the following steps:
(1) forming an aluminum alloy rod into an aluminum profile through a single-hole extrusion die, wherein the temperature of an extrusion outlet is 515-525 ℃, the temperature of the aluminum alloy rod is controlled to be 450-470 ℃, the temperature of the extrusion die is 420 ℃, the extrusion speed is controlled to be 30-35mm/s, and the front forming speed is higher than the tail forming speed;
(2) and carrying out artificial aging treatment on the formed aluminum profile to obtain an aluminum profile finished product.
The aging time of the artificial aging treatment in the experiment is controlled to be 3.5h, aluminum profiles are respectively prepared at the aging temperatures of 165 ℃, 175 ℃, 185 ℃, 195 ℃, 200 ℃ and 205 ℃, and the average audio frequency and the average hardness of the prepared aluminum profiles are detected, and the results are shown in the following table.
As can be seen from the above table, the hardness and the audio frequency of the profile gradually increase at the aging temperature of 165-195 ℃, both of the hardness and the audio frequency start to significantly decrease at 205 ℃, and the audio frequency value and the Vickers hardness value are in positive correlation change. The hardness of the section bar is the highest at the aging temperature of 195 ℃, and the section bar meets the requirement of 58Hv of the national standard GB/T5237.1-2017.
Experiment 4
The frequency-stabilizing medium-strength aluminum profile production process for the experiment comprises the following steps:
(1) forming an aluminum alloy rod into an aluminum profile through a single-hole extrusion die, wherein the temperature of an extrusion outlet is 515-525 ℃, the temperature of the aluminum alloy rod is controlled to be 450-470 ℃, the temperature of the extrusion die is 420 ℃, the extrusion speed is controlled to be 30-35mm/s, and the front forming speed is higher than the tail forming speed;
(2) and carrying out artificial aging treatment on the formed aluminum profile to obtain an aluminum profile finished product.
The aging temperature of the artificial aging treatment in the experiment is controlled at 195 ℃, aluminum profiles are respectively prepared with the aging time of 0.5-11.5h, and the average audio frequency and the average hardness of the prepared aluminum profiles are detected, and the results are shown in the following table.
It can be seen from the above table that the hardness and the tone frequency of the profile gradually increase when the aging time is between 0.5 and 7.5h, and both start to decrease after 8.5 h. According to the requirement 58Hv of the national standard GB/T5237.1-2017, the aluminum profiles prepared with the aging time of 3.5-11.5h all meet the national standard requirement, and in order to better meet the higher production efficiency and the lower production cost, the aging time of 3.5h is the best.
The invention is further illustrated by the following examples.
Example 1
The production process of the frequency-stabilized medium-strength aluminum profile comprises the following steps:
(1) forming an aluminum alloy rod into an aluminum profile through a single-hole extrusion die, controlling the temperature of an extrusion outlet at 515-520 ℃, the temperature of the aluminum alloy rod at 450-460 ℃, the temperature of the extrusion die at 420 ℃, the extrusion speed at 30-32mm/s, and the front forming speed being greater than the tail forming speed;
(2) and carrying out artificial aging treatment on the formed aluminum profile to obtain an aluminum profile finished product, wherein the aging temperature of the artificial aging treatment is 185 ℃, and the aging time is 3.5 h.
The production process of the frequency-stabilizing medium-strength aluminum profile has no limitation on the type of the aluminum profile, is suitable for various types of aluminum profiles including 6063-T5, and the finished aluminum profile can be used for manufacturing keys of a harmonica.
Example 2
The production process of the frequency-stabilized medium-strength aluminum profile comprises the following steps:
(1) forming an aluminum alloy rod into an aluminum profile through a single-hole extrusion die, controlling the temperature of an extrusion outlet at 525 ℃, the temperature of the aluminum alloy rod at 460-470 ℃, the temperature of the extrusion die at 420 ℃, the extrusion speed at 33-35mm/s, and the front forming speed greater than the tail forming speed;
(2) and carrying out artificial aging treatment on the formed aluminum profile to obtain an aluminum profile finished product, wherein the aging temperature of the artificial aging treatment is 195 ℃ and the aging time is 3.5 h.
The production process of the frequency-stabilizing medium-strength aluminum profile has no limitation on the type of the aluminum profile, is suitable for various types of aluminum profiles including 6063-T5, and the finished aluminum profile can be used for manufacturing keys of a harmonica.
Example 3
The production process of the frequency-stabilized medium-strength aluminum profile comprises the following steps:
(1) forming an aluminum alloy rod into an aluminum profile through a single-hole extrusion die, wherein the temperature of an extrusion outlet is controlled to be 515-520 ℃, the temperature of the aluminum alloy rod is controlled to be 450-470 ℃, the temperature of the extrusion die is 420 ℃, the extrusion speed is controlled to be 32-35mm/s, and the front forming speed is higher than the tail forming speed;
(2) and carrying out artificial aging treatment on the formed aluminum profile to obtain an aluminum profile finished product, wherein the aging temperature of the artificial aging treatment is 185 ℃, and the aging time is 11.5 h.
The production process of the frequency-stabilizing medium-strength aluminum profile has no limitation on the type of the aluminum profile, is suitable for various types of aluminum profiles including 6063-T5, and the finished aluminum profile can be used for manufacturing keys of a harmonica.
Example 4
The production process of the frequency-stabilized medium-strength aluminum profile comprises the following steps:
(1) forming an aluminum alloy rod into an aluminum profile through a single-hole extrusion die, controlling the temperature of an extrusion outlet at 520-525 ℃, the temperature of the aluminum alloy rod at 465-470 ℃, the temperature of the extrusion die at 420 ℃, the extrusion speed at 30-35mm/s, and the front forming speed being greater than the tail forming speed;
(2) and carrying out artificial aging treatment on the formed aluminum profile to obtain an aluminum profile finished product, wherein the aging temperature of the artificial aging treatment is 200 ℃, and the aging time is 3.5 h.
The production process of the frequency-stabilizing medium-strength aluminum profile has no limitation on the type of the aluminum profile, is suitable for various types of aluminum profiles including 6063-T5, and the finished aluminum profile can be used for manufacturing keys of a harmonica.
Example 5
The production process of the frequency-stabilized medium-strength aluminum profile comprises the following steps:
(1) forming an aluminum alloy rod into an aluminum profile through a single-hole extrusion die, controlling the temperature of an extrusion outlet at 515-520 ℃, the temperature of the aluminum alloy rod at 450-460 ℃, the temperature of the extrusion die at 420 ℃, the extrusion speed at 30-32mm/s, and the front forming speed being greater than the tail forming speed;
(2) and carrying out artificial aging treatment on the formed aluminum profile to obtain an aluminum profile finished product, wherein the aging temperature of the artificial aging treatment is 190 ℃ and the aging time is 5 h.
The production process of the frequency-stabilizing medium-strength aluminum profile has no limitation on the type of the aluminum profile, is suitable for various types of aluminum profiles including 6063-T5, and the finished aluminum profile can be used for manufacturing keys of a harmonica.
The aluminum profiles produced in the examples 1 to 5 were tested and all had stable audio frequency and stable hardness, and when applied to keys of a chime, the chime had a stable sounding effect.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (4)
1. A production process of a frequency-stabilized medium-strength aluminum profile is characterized by comprising the following steps:
(1) forming an aluminum alloy rod into an aluminum profile through an extrusion die, wherein the temperature of an extrusion outlet of the extrusion die is controlled to be 515-525 ℃, the temperature of the aluminum alloy rod is controlled to be 450-470 ℃, the extrusion speed is controlled to be 30-35mm/s, the temperature of the extrusion die is 420 ℃, and the extrusion die is only provided with one die hole;
(2) carrying out artificial aging treatment on the formed aluminum profile to obtain an aluminum profile finished product, wherein the aging temperature of the artificial aging treatment is 195 ℃ and the aging time is 3.5 h;
the aluminum alloy bar is 6063-T5 in model, and when the length of the aluminum alloy bar is 113.5 +/-0.1 mm, the audio frequency can be controlled between 1708Hz and 1712Hz, and the hardness is 74.7Hv to 78.8 Hv.
2. The production process of the frequency-stabilized medium-strength aluminum profile according to claim 1, wherein in the step (1), the forming speed of each aluminum profile is that the forming speed of the front part is greater than that of the tail part.
3. The production process of the frequency-stabilized medium-strength aluminum profile according to claim 1, wherein in the step (2), the audio frequency difference between the front end and the rear end of the finished aluminum profile is less than or equal to 4 Hz.
4. The aluminum profile produced by the production process according to any one of claims 1 to 3, wherein the aluminum profile is used for producing keys of a chime.
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Denomination of invention: Production process and application of aluminum profile with stable frequency and medium strength Effective date of registration: 20210617 Granted publication date: 20201124 Pledgee: Science City (Guangzhou) Finance Leasing Co.,Ltd. Pledgor: GUANGYA ALUMINIUM Co.,Ltd. Registration number: Y2021980004850 |