Manufacturing method of titanium-steel-stainless steel three-layer composite kitchen pot

Abstract

The method for making a titanium-steel-stainless steel three-layer composite kitchen pot comprises the following steps: taking a titanium-steel-stainless steel three-layer blank plate; selecting a stretching amount; firstly performing a first step of three passes of stamping and stretching on the blank plate on a stamping and stretching machine, wherein each pass stretches a deformation of 23.33%, and then performing a second step of three passes of stamping and stretching, wherein each pass stretches a deformation of 8.33%, to obtain a stretched pot body; after heating the stretched pot body to 80-120° C., spinning processing is performed on a spinning machine to obtain a titanium-steel-stainless steel three-layer composite kitchen pot body, and the kitchen pot body is polished and polished, and a pot handle is installed. The present invention adopts a method of first stamping and stretching and then spinning and shaping to make a kitchen pot body. When stamping and stretching, a two-step stamping and stretching with multiple passes and a small deformation rate in each pass is adopted, and then heating and spinning shaping is performed to ensure that the titanium layer in the titanium-steel-stainless steel three-layer composite plate will not have defects, so that the yield rate of the titanium-steel-stainless steel three-layer composite kitchen pot is high.

Description

Technical Field

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

[0002] A kitchen pot is a kitchen 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 and a pot handle installed on the pot body. In order to adapt to different stoves and different cooking methods for ingredients, the shape of the kitchen pot body 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 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 maintain its beautiful appearance after long-term use; the inside of the pot body contacts food with different acidity and alkalinity, so the inside of the pot body is required to be corrosion-resistant and will 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 kitchen pot are very different, a single metal sheet is not an ideal material for making a kitchen pot.

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

[0014] The thermal conductivity of stainless steel is not very good, but it has good corrosion resistance. Long-term use can keep the appearance of the kitchen pot beautiful, and it is suitable as the material for the outside of the kitchen pot. The thermal conductivity of titanium is not very good either, and its magnetic conductivity is not good, but it has high strength, beautiful appearance, stable performance, strong corrosion resistance, 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. Steel has good thermal conductivity and magnetic 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-stainless steel three-layer composite plate, 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-stainless steel three-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 forming 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-stainless steel three-layer composite kitchen pots made by this method is low.

[0017] In the prior art, there is no method for manufacturing a titanium-steel-stainless steel three-layer composite cooking pot with a high yield rate. 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-stainless steel three-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-stainless steel three-layer composite metal plate from having local fracture defects during stamping and stretching, when making a kitchen pot body, the present invention adopts a method of first stamping and stretching the titanium-steel-stainless steel three-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-stainless steel three-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 of which is stretched to an elongation of 8.2-8.4%, thereby obtaining a stretched pot body;

[0027] 4. After heating the stretched pot body to 80-120°C, spin it on a spinning machine at a line speed of 60 m / min to obtain a titanium-steel-stainless steel three-layer composite kitchen pot body;

[0028] 5. The titanium-steel-stainless steel three-layer composite cooking pot body is subjected to trimming, grinding and polishing treatments, and then a pot handle is installed on the titanium-steel-stainless steel three-layer composite cooking pot body after trimming, grinding and polishing.

[0029] The present invention adopts a method of first stamping and stretching to shape and then spinning to shape to manufacture a titanium-steel-stainless steel three-layer composite cooking pot body. During the stamping and stretching, a two-step stamping and stretching with multiple passes and a small elongation in each pass is adopted, and then spinning to shape under heating conditions is adopted, which can ensure that the titanium layer with higher strength and poor ductility in the titanium-steel-stainless steel three-layer composite plate will not have the defect of local fracture, so that the yield of the titanium-steel-stainless steel three-layer composite cooking pot body is higher.

[0030] The present invention will be further described below in conjunction with embodiments. DETAILED DESCRIPTION

[0031] The manufacturing method of the titanium-steel-stainless steel three-layer composite kitchen pot has the following steps:

[0032] 1. Take a titanium-steel-stainless steel three-layer composite plate with an industrial pure titanium layer thickness of 0.20 mm, a low carbon steel layer thickness of 1.00 mm, and a martensitic stainless steel layer thickness of 0.30 mm, and cut out the blank plate according to the size of the kitchen pot body;

[0033] 2. Place the blank on the corresponding forming die of the stamping and stretching machine, and apply the corresponding blank holding force to the periphery of the blank;

[0034] 3. Perform two-step stamping and stretching processing on the blank.

[0035] 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;

[0036] 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;

[0037] 4. After heating the stretched pot body to 80-120°C, spin it on a spinning machine at a line speed of 60 m / min to obtain a titanium-steel-stainless steel three-layer composite kitchen pot body;

[0038] 5. The titanium-steel-stainless steel three-layer composite cooking pot body manufactured by the following method is trimmed, ground and polished, and then a pot handle is installed on the ground and polished titanium-steel-stainless steel three-layer composite cooking pot body.

Claims

1. A method for making a titanium-steel-stainless steel three-layer composite kitchen pot comprises the following steps: include: first (1) Take a titanium-steel-stainless steel three-layer composite plate and cut it into a blank plate according to the size of the kitchen pot body; (2) Place the blank on a punching and stretching machine and apply a blank holding force to the periphery of the blank; Then The titanium-steel-stainless steel three-layer composite cooking pot body manufactured by the following method is subjected to trimming, grinding and polishing treatment, and then a pot handle is installed on the titanium-steel-stainless steel three-layer composite cooking pot body after trimming, grinding and polishing; (3) The blank is then subjected to two-step stamping and stretching processes; (4) Finally, the stretched pot body is heated to 80-120°C and then spun on a spinning machine at a line speed of 60 m / min to obtain a titanium-steel-stainless steel three-layer composite kitchen pot body. The invention is characterized in that: in step (3), the steps of performing two-step stamping and stretching processing on the blank plate 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 rotational stretching in sequence, each pass stretching an elongation of 8.2-8.4%, thereby obtaining a stretched pot body.

2. The method for making the titanium-steel-stainless steel three-layer composite cooking pot according to claim 1 is characterized by: The inner layer of the titanium-steel-stainless steel three-layer composite plate is an industrial pure titanium plate layer with a thickness of 0.20 mm, the middle layer is a low carbon steel plate layer with a thickness of 1.00 mm, and the outer layer is a martensitic stainless steel plate layer with a thickness of 0.30 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.