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Special-shaped stretch-formed heat insulation lunch box and preparation method thereof

A stretch forming and special-shaped technology, which is applied to the special-shaped stretch-formed thermal insulation lunch box and its preparation field, can solve the problems of many defective products, the special-shaped thermal insulation lunch box is prone to defects, and the plate is broken.

Active Publication Date: 2020-05-22
浙江安胜科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Stainless steel insulated lunch boxes are generally made by stretching, but in order to enrich the style of insulated lunch boxes, most of the current insulated lunch boxes are round and special-shaped structures, and special-shaped insulated lunch boxes formed by traditional stretching processes are prone to defects
During the stretching process, the straight sides and corners of the insulated lunch box formed by one-time special-shaped stretching are unevenly deformed, and the forces on each part of the insulated lunch box are different, and the thickness of each side is different, which leads to the rupture of the side wall near the corner. As a result, the processing quality of special-shaped insulated lunch boxes is low, and there are many defective products
At the same time, after the special-shaped stretching treatment, the corners and right-angled parts of the thermal insulation lunch box are unevenly stressed, and cracks are prone to appear in the later processing process. In order to solve the above problems, methods such as increasing the thickness of the plate and replacing the mold can be used, but increasing The thickness method will increase the weight of the thermal insulation lunch box, which does not meet the requirements of light weight. If the mold is replaced frequently, the production cost of the enterprise will be increased. A thermal insulation lunch box formed by special-shaped stretching, which is used to solve the problem of cracking the side wall of the lunch box during stretching, and at the same time eliminate the stress generated during the stretching process, improve its processing performance, and improve the intergranular corrosion of the thermal insulation lunch box

Method used

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  • Special-shaped stretch-formed heat insulation lunch box and preparation method thereof
  • Special-shaped stretch-formed heat insulation lunch box and preparation method thereof
  • Special-shaped stretch-formed heat insulation lunch box and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Embodiment 1: Insulation lunch box preparation one:

[0077] The preparation method of the 18Cr-8Ni stainless steel doped acicular zinc oxide whisker powder that present embodiment uses is as follows:

[0078] Add 12g of zinc powder and 10g of hydrogen peroxide into distilled water, stir with a stirring rate of 700rpm for 2h, then let it stand at room temperature for 36h, and obtain the pretreated zinc powder after filtering. Zinc powder, 30g of 15wt% citric acid solution, 2g of nano After mixing 18Cr-8Ni stainless steel powder, use a 500W mercury lamp as a light source, and after irradiating for 20 minutes, adjust the pH to 7.7±0.3 with sodium hydroxide solution, then continue to irradiate for 40 minutes to obtain 18Cr-8Ni stainless steel doped with needle-shaped zinc oxide crystals beard powder.

[0079] The thermal insulation lunch box prepared in this embodiment is as figure 1 As shown, the following process steps are included:

[0080] Shaped and constant temper...

Embodiment 2

[0117] Embodiment 2: Insulation lunch box preparation two:

[0118] The preparation method of the 18Cr-8Ni stainless steel doped acicular zinc oxide whisker powder that present embodiment uses is identical with embodiment 1;

[0119] Shaped and constant temperature stretching molding process of shell:

[0120] Blanking is identical with embodiment 1 operation;

[0121] Stretching for the first time: heat the heating ring of the stretching machine to 100°C, the pressure of the main cylinder of the stretching machine is 20Mpa, and the pressure of the lower cylinder is 12Mpa, and the rest of the operations are the same as those in Example 1;

[0122] The second stretching: heat the heating ring of the stretching machine to 90°C, the pressure of the main cylinder of the stretching machine is 13Mpa, and the pressure of the lower cylinder is 8Mpa, and the rest of the operations are the same as in Example 1;

[0123] Stretching for the third time: heat the heating ring of the stret...

Embodiment 3

[0141] Embodiment 3: Insulation lunch box preparation three:

[0142] The preparation method of the 18Cr-8Ni stainless steel doped acicular zinc oxide whisker powder that present embodiment uses is identical with embodiment 1;

[0143] Shaped and constant temperature stretching molding process of shell:

[0144] Blanking is identical with embodiment 1 operation;

[0145] Stretching for the first time: heat the heating ring of the stretching machine to 90°C, the pressure of the main cylinder of the stretching machine is 15Mpa, and the pressure of the lower cylinder is 10Mpa, and the rest of the operations are the same as those in Example 1;

[0146] The second stretching: heat the heating ring of the stretching machine to 70°C, the pressure of the main cylinder of the stretching machine is 10Mpa, and the pressure of the lower cylinder is 5Mpa, and the rest of the operations are the same as in Example 1;

[0147] Stretching for the third time: heat the heating ring of the stre...

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Abstract

The invention discloses a special-shaped stretch-formed heat insulation lunch box and a preparation method thereof, and belongs to the technical field of heat insulation lunch boxes. The preparation method includes an outer shell special-shaped constant-temperature stretch-forming process, an inner container special-shaped constant-temperature stretch-forming process, an outer shell inner container special-shaped welding process, an interlayer vacuum process and a lunch box surface treatment process; the outer shell special-shaped constant-temperature stretch-forming process includes the following steps of three times of stretching, vacuum solid solution stress relief, shaping, pre-edge trimming, laser opening flatting and other steps; and the inner container special-shaped constant-temperature stretch-forming process includes the following steps of three times of stretching, secondary vacuum solid solution stress relief, secondary shaping, secondary pre-edge trimming, secondary laseropening flatting, special-shaped rotating opening flattening and other steps. The process mass production processability of products is met through multiple times of special-shaped stretch-forming, side walls are prevented from cracking, meanwhile, thick and big internal molecular lattice of a material after multiple times of forming is improved through vacuum solid solution stress relief treatment, stress relief in steps is not needed, and the outline smoothness and heat insulation effectiveness of the products are improved.

Description

technical field [0001] The invention relates to the technical field of thermal insulation lunch boxes, in particular to a thermal insulation lunch box formed by special-shaped stretching and a preparation method thereof. Background technique [0002] In modern life, the pace of life is getting faster and faster. For reasons of thrift and sanitation, many people choose to bring lunch boxes with them. Among them, the materials of thermal insulation lunch boxes are relatively diverse. The exterior materials are divided into stainless steel thermal insulation materials and PP materials, and the inner tank materials are divided into stainless steel materials, ceramic materials, and glass materials. In terms of practicality, stainless steel thermal insulation lunch boxes are resistant to falling and have a long service life. It is long and has high safety, so it becomes the first choice for insulated lunch boxes. [0003] Stainless steel insulated lunch boxes are generally made b...

Claims

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Application Information

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IPC IPC(8): B21D51/18B21D22/20B21D35/00B23P15/00
CPCB21D22/20B21D22/201B21D22/208B21D35/002B21D51/18B23P15/00
Inventor 罗秋霞刘力刘成钢陈德福
Owner 浙江安胜科技股份有限公司
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