The A-shaped arc forming device and the angle forming device are ideal for making signs with materials such as acrylic. Based on the previous generation of hot bending tools, these two devices have been innovatively upgraded and use PTC heating elements to ensure safety, better heating efficiency, lower energy consumption, faster heating speed and longer service life. The heating temperature is automatically controlled, eliminating the trouble of turning on any thermostat, so it is very easy to use. The heat-conducting aluminum plate ensures that the processed material is heated evenly and stably, and the material is in good contact with the heating plate. Plastic materials with a thickness of 1.5mmdash4mm can be processed with this device. No smoke or steam is generated during heating, the softening speed is very fast, and the heating plate is oxidized and will not stick to the processed material. The device also has a simple and easy-to-use design, and the housing is made of heat-resistant ABS. The bottom, edges and heating plates of the heating part are flat and even, so the device can directly process plates with a maximum width of nearly 100mm.