CN103920809B - Microwave energy is utilized uniformly to heat the device producing arc part - Google Patents

Abstract

The invention discloses a device for uniformly heating and producing arc-shaped parts by using microwave energy, which comprises a waveguide, which is an arc-shaped groove with a rectangular cross section. The waveguide has a width of 25 cm and a height of 12 cm. The top plate and the The upper and lower support frames are respectively arranged on the base plate, and the upper and lower support frames are also arc-shaped blocks in the same bending direction as the waveguide, and the thickness of the upper and lower support frames near the microwave entrance of the waveguide is smaller than that near the microwave exit of the waveguide. Thickness, a mold is installed in the arc cavity between the upper and lower support frames, and the mold is also an arc block with the same bending direction as the waveguide. The mold is equipped with a cavity of the material to be processed that is the same as the bending arc of the waveguide. Arc-shaped waveguide blocks are respectively arranged on the two ends. The invention can effectively solve the problem of microwave energy attenuation in traditional devices, and meanwhile, the device is also suitable for the preparation of arc-shaped parts.

Description

A device for uniform heating and production of arc-shaped parts using microwave energy

technical field

The invention relates to a device for uniformly heating arc-shaped materials to be processed by using microwaves in a microwave manufacturing process.

Background technique

Chinese patent application number 201220349243.2 discloses a device for uniform heating using microwave energy, including a waveguide (1) and a mold (4), and upper and lower support frames are respectively fixed on the top and bottom plates in the waveguide (1) (2,3), the left and right side plates of the mold (4) are respectively provided with Mitsubishi cylindrical waveguide blocks (4a), and the middle part of the mold (4) is provided with a placement cavity (4b) for materials to be processed ), the upper and lower support frames (2,3) are wedge-shaped blocks, a wedge cavity is formed between the upper and lower support frames (2,3), and the mold (4) is a wedge cavity Wedge blocks of the same size, the mold (4) is installed in the wedge cavity between the upper and lower support frames (2, 3). The two supporting frames and the mold are both supported in a wedge shape, so that the microwave enters from the thicker end of the mold, which is equivalent to the widening of the entrance of the microwave and the narrowing of the exit. Although the microwave energy will be attenuated due to the absorption of the material to be processed, due to the The mold gradually narrows, and the microwave energy is gathered together in the mold, which can reduce the attenuation of the microwave energy, and even increase the microwave energy, improve the utilization efficiency of the microwave, and make the physical properties of the processed material uniform.

But the above-mentioned device is only applicable to the material to be processed which is a rectangular material. When the material to be processed becomes an arc-shaped material, such as automobile shock-absorbing spring steel, uniform heating cannot be guaranteed with the above device, because the propagation characteristic of microwave energy is that the energy in the center is the largest and gradually decreases to both sides. Therefore, the arc-shaped parts Uniform heating is not obtained in this device.

Contents of the invention

In order to solve the above-mentioned technical problems, the present invention provides a device that uses microwave energy to uniformly heat and produce arc-shaped parts. uniform.

In order to achieve the above object, the technical solution of the present invention is as follows: a device for uniformly heating and producing arc-shaped parts using microwave energy, including a waveguide (1), characterized in that: the waveguide (1) is an arc-shaped groove, and its transverse The cross-section is rectangular, the length a of the waveguide (1) is 12cm, and the width b is 25cm. The top and bottom plates in the waveguide (1) are respectively provided with upper and lower support frames (2, 3). The lower support frames (2, 3) are all arc-shaped blocks having the same bending radian as the waveguide (1), and the upper and lower support frames (2, 3) are close to the waveguide (1), and the thickness of the microwave inlet is smaller than that close to the waveguide (1). The thickness of the microwave outlet of the waveguide (1), a mold (4) is installed in the arc cavity between the upper and lower support frames (2, 3), and the mold (4) is also in the direction of bending of the waveguide (1). The same arc-shaped block, the mold (4) is provided with a cavity (4b) of the material to be processed that is the same as the curvature of the waveguide (1), and the two ends of the mold (4) are respectively provided with an arc-shaped waveguide block (4a), the cross-section of the arc-shaped waveguide block (4a) is a triangle in which two sides are arc-shaped sides.

In the above technical solution: the frequency of the microwave is 915MHz.

Using the above technical solution, the waveguide is designed in an arc shape, and the length a of the waveguide is 12 cm, and the width b is 25 cm. It can ensure that the microwave of this frequency enters the waveguide, and the radian design of the waveguide device is conducive to the continuous reflection of the microwave into the mold, so there is no dissipation. Similarly, the support frame is set, the support frame is also an arc frame, and the thickness of the entrance of the support frame is relatively narrow, that is to say, the thickness of the mold at this place is large, the entrance width of the microwave is large, and the exit width is small, although the microwave energy It will attenuate due to the absorption of the material to be processed, but due to the gradual narrowing of the mold, the microwave energy is gathered together in the mold, which can reduce the attenuation of microwave energy, and even increase the microwave energy, improving the utilization efficiency of microwave According to measurements, when the device heats the arc-shaped part, the temperature at the beginning, middle and end of the arc-shaped part is basically the same, so that the physical properties of the processed material are uniform.

As a preference: the mold (4) is made of silica glass, and the upper and lower support frames (2, 3) are made of honeycomb polyethylene. The material of the mold has a strong ability to absorb microwaves.

As preferably: the thickness of the thicker end of the mold (4) is 7-11 times the height of the cavity (4b), and the thickness of the thinner end of the mold (4) is 1-3 times the height of the cavity (4b) . In this way, the attenuation rate of the microwave energy can be reduced to the minimum, and even the attenuation rate of the microwave energy can become a negative value.

Beneficial effects: the invention has reasonable design, simple structure, low manufacturing cost, can effectively solve the problem of microwave energy attenuation in traditional devices, and meanwhile, the device is also suitable for the preparation of arc-shaped parts.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a sectional view along line A-A of Fig. 1 .

detailed description

Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

Embodiment 1, as shown in Fig. 1-Fig. 2, the device for uniformly heating and producing arc-shaped parts using microwave energy of the present invention consists of a waveguide 1, upper and lower support frames 2, 3 and a mold 4 and other components.

The waveguide 1 is an arc-shaped groove with a rectangular cross section. The length a of the waveguide 1 is 12 cm, and the width b is 25 cm. The frequency of the microwave suitable for the device is 915 MHz. Microwave energy of this frequency enters the waveguide 1 . The top and bottom plates in the waveguide 1 are respectively provided with upper and lower support frames 2, 3, and the upper and lower support frames 2, 3 are also arc-shaped blocks in the same bending direction as the waveguide 1, and the The thickness of the upper and lower support frames 2, 3 near the microwave entrance of the waveguide 1 is smaller than the thickness of the microwave exit of the waveguide 1, and a mold 4 is installed in the arc cavity between the upper and lower support frames 2, 3, and the mold 4 is also an arc-shaped block in the same bending direction as the waveguide 1 (the mold 4 is composed of an upper mold and a lower mold, and the upper mold and the lower mold are curved as a whole after being molded), and the mold 4 is provided with a curved arc that is in line with the waveguide 1. For the same cavity 4b of the material to be processed, the thickness of the mold 4 near the microwave inlet end of the waveguide 1 is relatively large, and the thickness of the end near the microwave outlet of the waveguide 1 is small. The thickness of the thicker end of the mold 4 is 7-11 times the height of the cavity 4b, and the thickness of the thinner end of the mold 4 is 1-3 times the height of the cavity 4b. The two ends of the mold 4 are provided with arc-shaped waveguide blocks 4a respectively. The shape of the arc-shaped waveguide blocks 4a is similar to that of a Mitsubishi column. The triangle of shape side, and these two arc-shaped sides are the side that does not contact with the end face of mold 4.

Claims (2)

1. A device that utilizes microwave energy to uniformly heat and produce arc-shaped parts, comprising a waveguide (1), is characterized in that: the waveguide (1) is an arc-shaped groove, and its cross-section is rectangular, and the waveguide (1) The length a is 12cm, and the width b is 25cm. The top and bottom plates in the waveguide (1) are respectively provided with upper and lower support frames (2, 3), and the upper and lower support frames (2, 3) are an arc-shaped block having the same bending radian as the waveguide (1), and the thickness of the upper and lower support frames (2, 3) close to the microwave entrance of the waveguide (1) is smaller than the thickness close to the microwave exit of the waveguide (1). A mold (4) is installed in the arc-shaped cavity between the upper and lower support frames (2, 3), and the mold (4) is also an arc-shaped block in the same bending direction as the waveguide (1), and the mold (4) ) is provided with a material cavity (4b) to be processed that is the same as the bending arc of the waveguide (1), and the two ends of the mold (4) are respectively provided with arc-shaped waveguide blocks (4a), and the arc-shaped waveguide The cross-section of the block (4a) is a triangle whose two sides are arc edges, and the thickness of the thicker end of the mold (4) is 7-11 times of the height of the cavity (4b), and the mold (4) is relatively The thickness of the thin end is 1-3 times the height of the cavity (4b), and the frequency of the microwave is 915MHz. 2. The device for uniformly heating and producing arc-shaped parts using microwave energy according to claim 1, characterized in that: the mold (4) is made of silica glass, and the upper and lower support frames (2, 3) Made of cellular polyethylene.