Knocking type double-point incremental forming device and method combined with induction heating

Abstract

The invention discloses a knocking type double-point incremental forming device and method combined with induction heating. The knocking type double-point incremental forming device comprises a passive tool head capable of conducting induction heating, an active tool head capable of conducting high-frequency knocking and a water cooling device. The driven tool head and the driving tool head are located on the two side faces of a to-be-machined plate, and the driven tool head can move along with the driving tool head. The passive tool head is subjected to induction heating through an induction coil, and the temperature of one side of the to-be-machined plate is increased; the driving tool head can knock one side of a to-be-machined plate at high frequency, and the forming performance of the to-be-machined plate is improved under the knocking action of certain amplitude and frequency. The impact tool head is adopted on one side, the forming performance of the plate can be improved under certain amplitude and frequency, meanwhile, water is sprayed to an impact point for cooling, creep deformation of the plate due to overheating is prevented, and induction heating is adopted on the other side, so that the plasticity of the material is improved.

Description

Technical Field

[0001] The invention relates to the technical field of sheet metal parts forming, and in particular to a percussion-type double-point progressive forming device and method combined with induction heating. Background Art

[0002] With the rapid development of the manufacturing industry, the demand for efficient, flexible and low-cost manufacturing of complex-shaped parts is becoming more and more urgent. Personalized customization has become the mainstream trend. Whether it is automotive parts, special components in the aerospace field, or creative works in the field of art and design, consumers are increasingly pursuing unique products, and there is an urgent need for manufacturing technologies that can quickly respond to diverse needs. Although traditional sheet metal forming methods, such as stamping and stretching, are highly efficient in large-scale production, they have high mold costs and long manufacturing cycles in the context of small batches and diversified product demands. With the continuous evolution of science and technology, double-point incremental forming technology has emerged. It can flexibly adjust the processing path according to different design requirements, and can efficiently manufacture various complex-shaped parts without relying on complex molds. It originates from single-point incremental forming technology. Although single-point incremental forming has the advantage of processing complex-shaped parts without or with only simple molds, it still has certain shortcomings in terms of processing accuracy, efficiency, and mechanical properties of parts.

[0003] At the same time, the lightweight design of complex structures is of great significance. It is difficult to efficiently produce complex-shaped thin-walled parts using traditional manufacturing methods for a variety of common engineering materials such as aluminum alloys and stainless steel. However, the double-point incremental forming technology can produce high-precision parts with good mechanical properties without significantly increasing costs, opening up a new way to reduce weight and improve performance. In addition, in the global environment of advocating energy conservation and emission reduction, the double-point incremental forming technology reduces energy consumption and material waste in the mold manufacturing process because it does not require or requires only a small number of molds, which is in line with the concept of sustainable development.

[0004] However, materials such as titanium alloys have high deformation resistance and severe springback when formed at room temperature, resulting in low forming accuracy. In addition, due to the large friction between tools, it is easy to cause deviations between the actual shape of the part and the designed shape.

[0005] Therefore, the prior art has defects and needs to be improved. Summary of the invention

[0006] The technical problem to be solved by the present invention is to address the problems of poor forming performance and severe springback during forming of high-strength materials such as titanium alloy plates. A knocking-type double-point progressive forming device and method combined with induction heating is proposed, which can ensure the forming quality of titanium alloy plates, reduce springback, and improve forming accuracy.

[0007] The present invention adopts the following technical solution:

[0008] A percussion-type double-point progressive forming device combined with induction heating comprises a passive tool head (3) capable of induction heating, an active tool head (6) capable of high-frequency percussion, and a water cooling device (5); the passive tool head (3) and the active tool head (6) are located on two sides of a sheet material (4) to be processed, and the passive tool head (3) can move with the active tool head (6); the passive tool head (3) uses an induction coil (2) to perform induction heating on the passive tool head (3) to increase the temperature of one side of the sheet material (4) to be processed; the active tool head (6) can percuss one side of the sheet material (4) to be processed at a high frequency, and the sheet material (4) to be processed improves its forming performance under the percussion action of a certain amplitude and frequency.

[0009] The device controls the knocking amplitude of the active tool head (6) to be 5-15 mm and the knocking vibration frequency to be 4-8 Hz. Within this range, vibration control is performed according to the principle of using a higher frequency for a small amplitude and a lower frequency for a large amplitude.

[0010] In the device, the striking tool head is used as an active working component, and the heating tool head is used as an auxiliary working component.

[0011] The device adopts vertical processing to stand up the sheet material and perform progressive forming from both sides.

[0012] The device can control the knocking amplitude and frequency by controlling the pneumatic knocking system. The pneumatic knocking system is rigidly connected to the robot, and the tool head is driven by the cylinder and the robot to realize knocking-type progressive forming.

[0013] In the device, the passive tool head (3) adopts electromagnetic induction heating, controls the temperature by changing the magnitude of the induced current, and measures the temperature using a thermometer.

[0014] In the device, the passive tool head (3) is made of red hard alloy and has a diameter of 20 mm.

[0015] The device, the water cooling device, is arranged on one side of the active tool head (6), rigidly connected to the active tool head (6), and the water spray port is aimed at the striking point of the tool head to cool down.

[0016] According to the double-point progressive forming method of any of the above devices, one side of the sheet material (4) to be processed is formed by tapping by the active tool head (6), while the other side is induction heated by the passive tool head (3).

[0017] The present invention uses an impact tool head on one side, which can improve the forming performance of the sheet metal under a certain amplitude and frequency. At the same time, water is sprayed on the impact point to cool it down to prevent the sheet metal from overheating and creeping. The other side uses induction heating to improve the plasticity of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a tapping double-point incremental forming device combined with induction heating;

[0019] 1. Machine tool connecting plate, 2. Induction coil, 3. Passive tool head, 4. Sheet material to be processed, 5. Water cooling device, 6. Active tool head, 7. Cylinder, 8. Machine tool connecting plate, 9. Air pump; DETAILED DESCRIPTION

[0020] The present invention is described in detail below in conjunction with specific embodiments.

[0021] like Figure 1 As shown, a percussion-type double-point progressive forming device combined with induction heating includes a passive tool head 3 capable of induction heating, an active tool head 6 capable of high-frequency percussion, and a water cooling device 5; the passive tool head 3 and the active tool head 6 are located on the two sides of the sheet material 4 to be processed, and the passive tool head 3 can move with the active tool head 6. The passive tool head 3 uses an induction coil 2 to perform induction heating on it, and can increase the temperature of one side of the sheet material 4 to be processed during operation, and achieve the purpose of controlling the temperature by controlling the current size, thereby improving the plasticity of the sheet material 4 to be processed; the active tool head 6 can percuss one side of the sheet material 4 to be processed at a high frequency under the control of the pneumatic system and the robot, and the sheet material 4 to be processed can improve the forming performance under a certain amplitude and frequency; one side of the sheet material is percussion-formed, and the other side is induction-heated at the same time. During the forming process, the non-percussion side is more deformed and more prone to rupture, so the sheet material on this side is heated to improve the forming limit of the material.

[0022] A water cooling device 5 is also provided to spray water on the struck part of the sheet material 4 to be processed when the sheet material 4 is overheated, so as to cool down the sheet material on one side and prevent the sheet material 4 from overheating and creeping.

[0023] Preferably, the knocking amplitude of the active tool head 6 is controlled to be 5-15 mm, and the knocking vibration frequency is controlled to be 4-8 Hz. Within this range, vibration control is performed according to the principle of using a higher frequency for a small amplitude and a lower frequency for a large amplitude.

[0024] When in use, the sheet is clamped vertically, the induction coil is energized first, and the working temperature is monitored by an infrared thermometer. When the required temperature is reached, the sheet is formed. The air pump is turned on, and the passive tool head 3 and the active tool head 6 on both sides approach the sheet according to the forming trajectory. The active tool head 6 acts as the active side and performs non-continuous contact tapping to reduce friction. The movement of the tool head is controlled by the mechanical arm, and the tool head is controlled by the pneumatic system to perform tapping and forming. At the same time, the water cooling device is turned on, and when the sheet 4 to be processed is overheated, water is sprayed on the tapped part to perform local cooling on one side of the sheet to prevent the material from overheating and creeping. The induction heating tool head on the other side is used as an auxiliary to increase the processing temperature on one side of the sheet, improve the forming performance of the material, and reduce rebound.

[0025] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A percussion double-point progressive forming device combined with induction heating, characterized in that: The invention comprises a passive tool head (3) capable of induction heating, an active tool head (6) capable of high-frequency knocking, and a water cooling device (5); the passive tool head (3) and the active tool head (6) are located on two sides of a sheet material (4) to be processed, and the passive tool head (3) can move with the active tool head (6); the passive tool head (3) uses an induction coil (2) to perform induction heating on the passive tool head (3) to increase the temperature of one side of the sheet material (4) to be processed; the active tool head (6) can knock one side of the sheet material (4) to be processed at a high frequency, and the sheet material (4) to be processed has improved forming performance under the knocking action of a certain amplitude and frequency.

2. The device according to claim 1, characterized in that The knocking amplitude of the active tool head (6) is controlled to be 5-15 mm, and the knocking vibration frequency is controlled to be 4-8 Hz. Within this range, vibration control is performed according to the principle of using a higher frequency for a small amplitude and a lower frequency for a large amplitude.

3. The device according to claim 1, characterized in that During operation, the striking tool head serves as an active working part, and the heating tool head serves as an auxiliary working part.

4. The device according to claim 1, characterized in that The vertical processing is adopted to stand the sheet upright and perform progressive forming from both sides.

5. The device according to claim 1, characterized in that: The knocking amplitude and frequency can be controlled by controlling the pneumatic knocking system. The pneumatic knocking system is rigidly connected to the robot, and the tool head is driven by the cylinder and the robot together to realize knocking-type progressive forming.

6. The device according to claim (1), characterized in that The passive tool head (3) adopts an electromagnetic induction heating method, controls the temperature by changing the magnitude of the induced current, and measures the temperature using a thermometer.

7. The device according to claim 1, characterized in that The passive tool head (3) is made of red hard alloy and has a diameter of 20 mm.

8. The device according to claim 1, characterized in that The water cooling device is arranged on one side of the active tool head (6) and is rigidly connected to the active tool head (6). The water spray port is aimed at the striking point of the tool head to cool the temperature.

9. The double-point incremental forming method according to any one of claims 1 to 8, characterized in that: One side of the sheet material (4) to be processed is hammered and formed by an active tool head (6), while the other side is induction heated by a passive tool head (3).

Images