In the field of heat treatment and processing technology, a device and method for preventing heat treatment deformation of workpieces are provided, which solves the problem that the existing technology cannot effectively prevent heat treatment deformation of workpieces flange. A device for preventing workpiece from heat treatment deformation, the device includes a base for placing workpiece, a support frame fixedly connected with the base, the support frame is provided with a flange shaped cover for preventing workpiece flange from heat treatment deformation, the outer contour of the flange shaped cover is consistent with the inner shape of the workpiece flange, and the flange shaped cover is also provided with an upper and lower end faces of the workpiece flange to match A flange that limits the change in relative position of the flange. In the process of heat treatment of workpiece, the use of setting cover to prevent flange deformation can control the deformation of workpiece in heat treatment to a large extent.
Several methods to prevent heat treatment deformation
Heat treatment deformation is one of the main defects in the process of heat treatment. For some precision parts, tools and moulds, they are often scrapped because of the over tolerance of heat treatment deformation. Therefore, the heat treatment plant summarizes several methods to prevent heat treatment deformation.
(1) Reasonable material selection. The micro deformation die steel with good material (such as quenched steel) should be selected. The die steel with serious carbide segregation should be forged reasonably and quenched and tempered Shunde heat treatment should be carried out. The large and non forging die steel can be treated by solution refining heat treatment.
(2) The die structure design should be reasonable, the thickness should not be too different, the shape should be symmetrical, and the deformation law should be mastered for the large deformation die, and the machining allowance should be reserved.
(3) Carry out pre heat treatment to eliminate the residual stress produced in the machining process.
(4) Reasonable selection of heating temperature, control of heating speed, slow heating, preheating and other balanced heating methods to reduce the deformation of the mold heat treatment.
(5) On the premise of ensuring the hardness, pre cooling, staged cooling and quenching or temperature quenching processes shall be adopted as far as possible.
(6) If conditions permit, vacuum heating quenching and cryogenic treatment after quenching shall be adopted as far as possible.
On 2018-08-08 11:45:46
