Method for reducing stamping fracture of voice diaphragm

Abstract

The invention relates to the technical field of voice diaphragm preparation. The invention discloses a method for reducing stamping rupture of a voice diaphragm. The method comprises a primary vacuum annealing process and a secondary vacuum annealing process, the first vacuum annealing process comprises the following steps: step 1, putting the voice diaphragm strip into a vacuum annealing furnace; 2, setting the working vacuum degree of the vacuum annealing furnace; 3, heating to a primary temperature value, preserving heat for 3-4 hours, cooling to 100 DEG C or below, opening a furnace door, and naturally cooling to room temperature; the secondary vacuum annealing process comprises the following steps: step 1, setting the working vacuum degree of the vacuum annealing furnace; and 2, heating to a secondary temperature value, preserving heat for 6-7 hours, cooling to 100 DEG C or below, opening a furnace door, naturally cooling to room temperature, and taking out a product. According to the method, traditional primary annealing is changed into secondary annealing, so that the voice diaphragm strip can obtain excellent flexibility, the poor stamping fracture in the stamping process is completely avoided, the voice diaphragm yield is improved, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of preparation of sound membranes, and in particular to a method for reducing stamping cracking. Background Art

[0002] The diaphragm is an important material for making loudspeakers. Sound is amplified and emitted to the outside through the diaphragm. The base material of the diaphragm is an ultra-thin titanium strip. The traditional diaphragm preparation method often uses a single annealing process, such as the titanium diaphragm for loudspeakers with publication number CN101478713A.

[0003] Due to its thin thickness, the strip is prone to stamping cracks during the process of stamping into sound membranes, and cannot be repaired and can only be scrapped, with a defective rate of more than 20%. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a method for reducing the punching and cracking of the sound membrane, which solves at least one of the above-mentioned technical problems.

[0005] The technical solution of the present invention is: a method for reducing the punching cracking of a sound film, characterized by comprising a primary vacuum annealing process and a secondary vacuum annealing process performed successively;

[0006] The first vacuum annealing process, the steps are as follows:

[0007] Step 1: placing the sound film strip into a vacuum annealing furnace;

[0008] Step 2, setting the working vacuum degree of the vacuum annealing furnace;

[0009] Step 3: Heat to the primary temperature value for 2-3 hours, keep warm for 3-4 hours, cool to below 100°C, open the furnace door, cool naturally to room temperature, and place for 1-3 hours;

[0010] The second vacuum annealing process, the steps are as follows:

[0011] Step 1, setting the working vacuum degree of the vacuum annealing furnace;

[0012] Step 2: Heat to the secondary temperature value for 3-4 hours, keep warm for 6-7 hours, cool to below 100°C, open the furnace door, cool naturally to room temperature, and take out the product;

[0013] The primary temperature value is lower than the secondary temperature value.

[0014] The present invention changes the traditional single annealing into a double annealing, so that the sound film strip can obtain excellent softness, completely avoid the poor stamping cracking in the stamping process, improve the sound film yield rate, and reduce the production cost.

[0015] More preferably, the primary temperature value is 500-510°C.

[0016] Further preferably, the vacuum degree of the vacuum annealing furnace is 5.0×10 -3 Pa.

[0017] More preferably, the secondary temperature value is 530-540°C.

[0018] Further preferably, after the secondary vacuum annealing process, a sound film product stamping process is performed.

[0019] Further preferably, the diaphragm strip is a titanium strip.

[0020] Further preferably, first, the titanium strip is processed by a multi-roll foil rolling mill and rolled to a thickness of 0.02 mm-0.1 mm for more than two times, straightened and leveled, and then cleaned to remove grease, and then subjected to a primary vacuum annealing process and a secondary vacuum annealing process.

[0021] A method for reducing punching cracking of a sound film, characterized by comprising a primary vacuum annealing process and a secondary vacuum annealing process performed successively;

[0022] The first vacuum annealing process, the steps are as follows:

[0023] Step 1: placing the sound film strip into a vacuum annealing furnace;

[0024] Step 2: Set the vacuum degree of the vacuum annealing furnace to 5.0×10 -3 Pa;

[0025] Step 3: Heat to 500-510°C for 2-3 hours, keep warm for 3-4 hours, cool to below 100°C, open the furnace door, cool naturally to room temperature, and place for 1-3 hours;

[0026] The second vacuum annealing process, the steps are as follows:

[0027] Step 1: Set the vacuum degree of the vacuum annealing furnace to 5.0×10 -3 Pa;

[0028] Step 2: Heat to 530-540°C for 3-4 hours, keep warm for 6-7 hours, cool to below 100°C, open the furnace door, cool naturally to room temperature, and take out the product.

[0029] Beneficial effects:

[0030] 1. The sound film strip is changed from the traditional single vacuum annealing process to a double vacuum annealing process, which significantly improves the sound film stamping damage.

[0031] 2. The stamping yield of the sound film increased from 80% to 99.9%, and the monthly production cost decreased. DETAILED DESCRIPTION

[0032] Specific embodiment 1, a method for reducing punching cracks of a sound film, comprising a primary vacuum annealing process and a secondary vacuum annealing process performed successively;

[0033] The first vacuum annealing process, the steps are as follows:

[0034] Step 1: placing the sound film strip into a vacuum annealing furnace;

[0035] Step 2, setting the working vacuum degree of the vacuum annealing furnace;

[0036] Step 3: Heat to the primary temperature value for 2-3 hours, keep warm for 3-4 hours, cool to below 100°C, open the furnace door, cool naturally to room temperature, and place for 1-3 hours;

[0037] The second vacuum annealing process, the steps are as follows:

[0038] Step 1, setting the working vacuum degree of the vacuum annealing furnace;

[0039] Step 2: Heat to the secondary temperature value for 3-4 hours, keep warm for 6-7 hours, cool to below 100°C, open the furnace door, cool naturally to room temperature, and take out the product;

[0040] The primary temperature value is lower than the secondary temperature value.

[0041] The present invention changes the traditional single annealing into a double annealing, so that the sound film strip can obtain excellent softness, completely avoid the poor stamping cracking in the stamping process, improve the sound film yield rate, and reduce the production cost.

[0042] The primary temperature is 500-510°C and the secondary temperature is 530-540°C.

[0043] After the secondary vacuum annealing process, the sound film stamping process is carried out.

[0044] The sound membrane strip is a titanium strip.

[0045] First, the titanium strip is processed by a multi-roll foil rolling mill and rolled to a thickness of 0.02mm-0.1mm for more than two times. After straightening and leveling, it is cleaned to remove grease, and then a vacuum annealing process and a secondary vacuum annealing process are performed.

[0046] Comparative Example 1:

[0047] The traditional primary annealing process is:

[0048] Step 1: placing the sound film strip into a vacuum annealing furnace;

[0049] Step 2: Set the vacuum degree of the vacuum annealing furnace to 5.0×10 -3 Pa;

[0050] Step 3: Heat to 500-510°C for 2-3 hours, keep warm for 3-4 hours, cool to below 100°C, open the furnace door, cool naturally to room temperature, and take out the product.

[0051] Supplementary, performance comparison between comparative example 1 and embodiment 1:

[0052] Example 1 Comparative Example 1 Impact resistance 360mpa 420mpa Punching depth mm 12mm 8mm

[0053] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for reducing the punching and cracking of a sound film, characterized in that: It includes a primary vacuum annealing process and a secondary vacuum annealing process that are carried out successively; The first vacuum annealing process, the steps are as follows: Step 1: placing the sound film strip into a vacuum annealing furnace; Step 2, setting the working vacuum degree of the vacuum annealing furnace; Step 3: Heat to the primary temperature value for 2-3 hours, keep warm for 3-4 hours, cool to below 100°C, open the furnace door, cool naturally to room temperature, and place for 1-3 hours; The second vacuum annealing process, the steps are as follows: Step 1, setting the working vacuum degree of the vacuum annealing furnace; Step 2: Heat to the secondary temperature value for 3-4 hours, keep warm for 6-7 hours, cool to below 100°C, open the furnace door, cool naturally to room temperature, and take out the product; The primary temperature value is lower than the secondary temperature value.

2. A method for reducing the punching and cracking of a sound film according to claim 1, characterized in that: The primary temperature value is 500-510°C.

3. A method for reducing the punching cracking of a sound film according to claim 1, characterized in that: The working vacuum value of the vacuum annealing furnace is 5.0×10 -3 Pa.

4. A method for reducing the punching and cracking of a sound film according to claim 1, characterized in that: The secondary temperature value is 530~540℃.

5. A method for reducing punching and cracking of a sound film according to claim 1, characterized in that: After the secondary vacuum annealing process, the sound film stamping process is carried out.

6. A method for reducing punching and cracking of a sound film according to claim 1, characterized in that: The sound membrane strip is a titanium strip.

7. A method for reducing punching and cracking of a sound film according to claim 1, characterized in that: First, the titanium strip is processed by a multi-roll mill and rolled more than twice to a thickness of 0.02mm-0.1mm, straightened and leveled, cleaned and degreased, and then subjected to a primary vacuum annealing process and a secondary vacuum annealing process.

8. A method for reducing the punching and cracking of a sound film, characterized in that: It includes a primary vacuum annealing process and a secondary vacuum annealing process that are carried out successively; The first vacuum annealing process, the steps are as follows: Step 1: placing the sound film strip into a vacuum annealing furnace; Step 2: Set the vacuum degree of the vacuum annealing furnace to 5.0×10 -3 Pa; Step 3: Heat to 500-510°C for 2-3 hours, keep warm for 3-4 hours, cool to below 100°C, open the furnace door, cool naturally to room temperature, and place for 1-3 hours; The second vacuum annealing process, the steps are as follows: Step 1: Set the vacuum degree of the vacuum annealing furnace to 5.0×10 -3 Pa; Step 2: Heat to 530-540°C for 3-4 hours, keep warm for 6-7 hours, cool to below 100°C, open the furnace door, cool naturally to room temperature, and take out the product.