Manufacturing method of titanium-steel-copper-steel-titanium five-layer composite kitchen pot

Abstract

The method for preparing a titanium-steel-copper-steel-titanium five-layer composite cooking pot comprises the following steps: obtaining a titanium-steel-copper-steel-titanium five-layer blank plate; selecting an elongation; firstly subjecting the blank plate to a first step of three stamping and stretching on a stamping and stretching machine, wherein each step results in an elongation of 23.33%, and then subjecting the blank plate to a second step of three stamping and stretching, wherein each step results in an elongation of 8.33%, to obtain a stretched pot body; and subjecting the stretched pot body to a spinning process at a temperature of -20°C to 45°C to obtain a titanium-steel-copper-steel-titanium five-layer composite cooking pot body, annealing, grinding, and polishing the cooking pot body, and installing a pot handle. The present invention adopts a method of first stamping and stretching to shape and then spinning to shape to manufacture a cooking pot body. During the stamping and stretching, a two-step stamping and stretching process with multiple passes and a small deformation rate in each pass is adopted, and then spinning to shape is added to ensure that the titanium layer in the titanium-steel-copper-steel-titanium five-layer composite plate will not have defects, so that the titanium-steel-copper-steel-titanium five-layer composite cooking pot has a high yield.

Description

Technical Field

[0001] The invention relates to a method for manufacturing a cooking pot, in particular to a method for manufacturing a titanium-steel-copper-steel-titanium five-layer composite cooking pot body. Background Art

[0002] A kitchen pot is a utensil used for frying, stir-frying, cooking, deep-frying, steaming, boiling, stewing and other cooking processes. The kitchen pot has a pot body made of metal plates. In order to adapt to different stoves and different cooking methods for ingredients, the pot body shape can be spherical, flat-bottomed spherical, flat-bottomed or barrel-shaped.

[0003] The body of a kitchen pot is made of metal sheets. The metal material of the kitchen pot is required to have high strength, good rigidity, high temperature resistance, good thermal conductivity, resistance to corrosion from the surrounding environment, beautiful appearance, and no production of substances that affect human health during use. Some also require good magnetic conductivity and other comprehensive properties.

[0004] When the kitchen pot is in use, the outside of the pot body contacts the heating stove and the external environment, and the inside of the pot body contacts the processed food. Therefore, the outside of the pot body is required to be resistant to high temperature corrosion and corrosion from the surrounding environment, and to maintain its beautiful appearance after long-term use; the inside of the pot body contacts food materials with different acidity and alkalinity, so the inside of the pot body is required to be resistant to acid and alkali corrosion and not produce substances that affect human health.

[0005] At present, the pot body of the kitchen pot is mostly made of a single material such as steel, stainless steel, aluminum, copper, etc. The comprehensive performance of the kitchen pot body made of a single material is not good, and the requirements for the use of the outside and inside of the kitchen pot body are very different. Especially when used in an environment surrounded by the ocean, the concentration of salt spray in the environment is high. The outside of the kitchen pot body is easily corroded by the salt spray in the salt spray environment, which affects the appearance.

[0006] In the prior art, the steps of making a kitchen pot body by stamping and stretching are as follows:

[0007] 1. Take the metal plate and cut out the blank according to the size of the pot body;

[0008] 2. Place the blank on the punching and stretching machine and apply a blank holding force to the periphery of the blank;

[0009] 3. Select the elongation of the blank;

[0010] 4. At room temperature, stamp and stretch the pot once to the selected elongation to form a stamped and stretched pot body;

[0011] 5. The stamped and stretched kitchen pot body is then trimmed, ground and polished, and finally a pot handle is installed on the ground and polished kitchen pot body.

[0012] Since the requirements for the outside and inside of a cooking pot are very different, a single-material metal plate is not suitable for making a cooking pot used in a marine environment.

[0013] The titanium-steel-copper-steel-titanium five-layer composite plate made of industrial pure titanium plate, low carbon steel plate, pure copper plate, low carbon steel plate and industrial pure titanium plate produced by Liaoning Xinhuayang Weiye Equipment Manufacturing Co., Ltd. in China is an ideal plate for making kitchen pots. The kitchen pot made of titanium-steel-copper-steel-titanium five-layer composite plate has titanium layers inside and outside, and a steel-copper-steel composite layer in the middle.

[0014] Titanium has good thermal conductivity and poor magnetic conductivity, but it has high strength, beautiful appearance, stable performance, corrosion resistance, strong resistance to salt spray corrosion, and good affinity with the human body. It can be made into medical devices or substitute organs for use in the human body. It is an ideal material for the inside of a kitchen pot and the outside of a pot when used in a marine environment. Steel has good magnetic conductivity, and copper has good thermal conductivity. Although it has poor corrosion resistance, it is in the middle layer that is not exposed.

[0015] In the kitchen pot body made of titanium-steel-copper-steel-titanium five-layer composite plates, various plates complement each other in performance, producing a synergistic effect, so that the comprehensive performance of the composite plate is better than that of a single material plate, better meeting the requirements of the kitchen pot body.

[0016] The titanium-steel-copper-steel-titanium five-layer composite plate is composed of plates with different physical properties, and the physical properties are not uniform. When the pot body is made by the one-time stamping and stretching method in the above-mentioned prior art, the one-time stamping and stretching deformation rate is very large, which will cause the titanium layer with higher strength and poor ductility in the titanium-steel-stainless steel three-layer composite plate to have local fracture defects. The yield rate of titanium-steel-copper-steel-titanium five-layer composite kitchen pots made by this method is low.

[0017] In the prior art, there is no method for manufacturing a titanium-steel-copper-steel-titanium five-layer composite cooking pot with a high yield. Summary of the invention

[0018] The purpose of the present invention is to overcome the above-mentioned shortcomings and to provide a method for manufacturing a titanium-steel-copper-steel-titanium five-layer composite cooking pot with a higher yield.

[0019] The present invention is implemented by the following method.

[0020] In order to prevent the titanium layer and the stainless steel layer with higher strength and poor ductility in the titanium-steel-copper-steel-titanium five-layer composite metal plate from having local fracture defects during stamping and stretching, when making a cooking pot body, the present invention adopts a method of first stamping and stretching the titanium-steel-copper-steel-titanium five-layer composite metal plate and then spinning to shape it. During the stamping and stretching shaping, a two-step stamping and stretching method with multiple passes and a small deformation rate in each pass is adopted.

[0021] To realize the above invention, the method for making the titanium-steel-stainless steel three-layer composite cooking pot has the following steps:

[0022] 1. Take the titanium-steel-copper-steel-titanium five-layer composite plate and cut out the blank plate according to the size of the kitchen pot body;

[0023] 2. Place the blank on the punching and stretching machine and apply a blank holding force to the periphery of the blank;

[0024] 3. Perform two-step stamping and stretching processing on the blank.

[0025] 3.1 In the first step, the blank is subjected to three passes of stamping and stretching in sequence, each pass stretching an elongation of 23.2-23.4%, to obtain the first step stretched blank;

[0026] 3.2 In the second step, the blank plate obtained in the first step is subjected to three passes of stamping and stretching in sequence, each pass stretching the blank plate to an elongation of 8.2-8.4%, thereby obtaining a stretched pot body;

[0027] 4. The stretched pot body is spun at a temperature of -20℃~45℃, with a spinning wheel arc of R20 and a spinning line speed of 80 m / min to obtain a spun pot body;

[0028] 5. Place the spinning pot body in a furnace at 550°C for 60 minutes for stress relief annealing to obtain an annealed pot body;

[0029] 6. The annealed pot body is trimmed, ground and polished, and then a pot handle is installed on the titanium-steel-copper-steel-titanium five-layer composite kitchen pot body after trimming, grinding and polishing.

[0030] The present invention adopts a method of first stamping and stretching to shape and then spinning to shape to manufacture a titanium-steel-copper-steel-titanium five-layer composite cooking pot body. During the stamping and stretching, a two-step stamping and stretching with multiple passes and a small deformation rate in each pass is adopted, and then spinning to shape, which can ensure that the titanium layer with higher strength and poor ductility in the titanium-steel-copper-steel-titanium five-layer composite plate will not have the defect of local fracture, so that the titanium-steel-copper-steel-titanium five-layer composite cooking pot body has a higher finished product rate.

[0031] The present invention will be further described below in conjunction with embodiments. DETAILED DESCRIPTION

[0032] The manufacturing method of the titanium-steel-copper-steel-titanium five-layer composite kitchen pot has the following steps:

[0033] The method comprises grinding and polishing the pot body of the kitchen pot made by the following method, and then installing a pot handle on the ground and polished pot body.

[0034] 1. Take a titanium-steel-copper-steel-titanium five-layer composite plate with an industrial pure titanium layer thickness of 0.10 mm, a low carbon steel layer thickness of 0.50 mm, and a copper layer thickness of 0.20 mm, and cut out the blank plate according to the size of the kitchen pot body;

[0035] 2. Place the blank on the punching and stretching machine and apply a blank holding force to the periphery of the blank;

[0036] 3. Perform two-step stamping and stretching processing on the blank.

[0037] 3.1 In the first step, the blank is subjected to three passes of stamping and stretching in sequence, each pass stretching an elongation of 23.33% to obtain the first step stretched blank;

[0038] 3.2 In the second step, the blank plate obtained in the first step is subjected to three passes of stamping and stretching in sequence, each pass stretching the blank plate to an elongation of 8.33%, thereby obtaining a stretched pot body;

[0039] 4. The stretched pot body is spun at a temperature of -20℃~45℃, with a spinning wheel arc of R20 and a spinning line speed of 80 m / min to obtain a spun pot body;

[0040] 5. The spinning pot body is placed in a furnace at 550°C for 60 minutes for stress relief annealing to obtain a titanium-steel-copper-steel-titanium five-layer composite kitchen pot body.

Claims

1. A method for making a titanium-steel-copper-steel-titanium five-layer composite cooking pot comprises the following steps: (1) Take a titanium-steel-copper-steel-titanium five-layer composite plate and cut it into a blank plate according to the size of the cooking pot body; (2) Place the blank on a punching and stretching machine and apply a blank holding force to the periphery of the blank; (3) Performing two-step stamping and stretching processing on the blank; (4) spinning the stretched pot body at a temperature of -20°C to 45°C, with a spinning wheel arc of R20 and a spinning line speed of 80 m / min to obtain a spinning shaped pot body; (5) The spinning pot body is kept in a furnace at 550°C for 60 minutes for stress relief annealing to obtain a titanium-steel-copper-steel-titanium five-layer composite kitchen pot body; Then, the titanium-steel-copper-steel-titanium five-layer composite cooking pot body is trimmed, ground and polished, and then a pot handle is installed on the titanium-steel-copper-steel-titanium five-layer composite cooking pot body after trimming, grinding and polishing. Features: The steps of performing the two-step stamping and stretching processing on the blank in step (3) are as follows: (3.1) In the first step, the blank is subjected to three passes of punching and stretching in sequence, each pass stretching an elongation of 23.2 to 23.4%, thereby obtaining the first step stretched blank; (3.2) In the second step, the blank is subjected to three passes of stamping and stretching in sequence, each of which is stretched to an elongation of 8.2-8.4%, thereby obtaining a stretched pot body.

2. The method for making the titanium-steel-copper-steel-titanium five-layer composite cooking pot according to claim 1 is characterized by: The titanium-steel-copper-steel-titanium five-layer composite plate is a titanium-steel-copper-steel-titanium five-layer composite plate with an industrial pure titanium layer thickness of 0.10 mm, a low carbon steel layer thickness of 0.50 mm, and a copper layer thickness of 0.20 mm. In the three-pass stamping and stretching process of the first step of the stamping and stretching process, each pass is stretched by 23.3% to obtain the first step stretched blank. In the three-pass stamping and stretching process of the second step of the stamping and stretching process, 8.33% of the elongation is drawn out in each pass to obtain a stretched pot body.