阅读说明：本技术 透平叶片新型加工工艺 (Novel machining process for turbine blade ) 是由 江涛 钟苏 戴琳 叶寒 李莉 吴志川 刘华 胡友宝 于 2019-08-30 设计创作，主要内容包括：本发明公开一种透平叶片新型加工工艺,该工艺方案可减少叶片刚性不足带来的加工误差,可提高其加工效率和精度,同时该工艺装夹方案只需要一个补块,可以减少材料损耗。它包括如下方法：a.将透平叶片坯件采用立式固定方式进行单端固定；b.对透平叶片坯件进行五轴铣加工,铣加工时对透平叶片坯件留存一定余量后进行精加工,c.在留存余量之上进行铣削一次精加工成型。(The invention discloses a novel processing technology of a turbine blade, which can reduce processing errors caused by insufficient rigidity of the blade and improve the processing efficiency and precision of the blade, and meanwhile, the clamping scheme of the technology only needs one patch, so that the material loss can be reduced. The method comprises the following steps: a. carrying out single-end fixing on the turbine blade blank in a vertical fixing mode; b. and c, carrying out five-axis milling on the turbine blade blank, reserving a certain allowance in the milling process, carrying out finish machining on the turbine blade blank, and carrying out milling one-time finish machining on the reserved allowance to form.)

1. A novel processing technology of a turbine blade is characterized by comprising the following steps:

a. carrying out single-end clamping and fixing on a turbine blade blank in a vertical fixing mode;

b. carrying out five-axis milling on the turbine blade blank, and stopping after a certain margin is reserved for the turbine blade blank during milling;

c. and milling and performing one-time finish machining on the retained allowance.

2. The novel process for machining a turbine blade as claimed in claim 1, wherein: the allowance in the step b refers to the standard thickness of the turbine blade standard part is increased by 0.5mm to 2.0 mm.

3. The value of the margin increases from the top to the bottom of the turbine blade blank.

4. The novel process for machining a turbine blade as claimed in claim 1, wherein: in the step a, only the bottom patch of the turbine blade blank is fixed when the turbine blade blank is vertically fixed, and the top of the turbine blade blank is in a free state.

Technical Field

The invention relates to the technical field of turbine blade processing, in particular to a novel processing technology of a turbine blade.

Background

Turbine blades are important components of turbomachinery (e.g., steam turbines, gas turbines, water turbines, etc.) for directing fluid flow in a certain direction and for propelling a rotor to rotate. The blades attached to the casing are called stationary blades or guide vanes, and the blades attached to the rotor are called moving blades. The main body of a turbine blade is the blade body, the dimensions of which are related to the flow capacity of the turbine. The turbine blade is a thin-walled part and has a complex shape, poor workpiece rigidity, difficult material cutting, extremely high requirement on surface quality and high processing difficulty.

The rigidity of a part is increased by adding auxiliary supports in the conventional turbine blade 1, referring to fig. 1, namely, two auxiliary devices 2 are respectively used at two ends of a blank or a workpiece in numerical control machining to fixedly support and then machine the two-end patches of the workpiece, the turbine blade is a thin-walled workpiece, stress is easily generated on the workpiece when a milling cutter machines the workpiece, the stress of the blade cannot be released due to the fixing mode at the two ends, the stress is released and redistributed after the machining is finished, the workpiece is slightly deformed, the workpiece precision and the surface roughness are difficult to guarantee, and meanwhile, the conventional finishing allowance is small and the machining time is long. In addition, the added patch is larger in blade material, the price of the blade material is high, and the cost of the blade material is improved.

In view of the above, the present invention discloses a novel machining process for a turbine blade, which can ensure the machining error of the turbine blade, improve the rigidity of the machined part, improve the machining efficiency and save the expensive materials.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, adapt to practical requirements, and discloses a novel machining process for a turbine blade, which can reduce machining errors caused by insufficient rigidity of the blade and improve the machining efficiency and precision of the blade.

In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:

a novel processing technology of a turbine blade is designed, and comprises the following steps:

a. the turbine blade blank is subjected to single-end clamping and fixing in a vertical fixing mode, and only one patch is arranged at the blade root of the blade blank;

b. and carrying out five-axis milling on the turbine blade blank, and stopping carrying out finish machining after a certain margin is reserved on the turbine blade blank during milling.

c. And milling and performing one-time finish machining on the retained allowance.

The allowance in the step b refers to the standard thickness of the turbine blade standard part is increased by 0.5mm to 2.0 mm.

The value of the margin increases from the top to the bottom of the turbine blade blank.

In the step a, only the bottom patch of the turbine blade blank is fixed when the turbine blade blank is vertically fixed, and the top of the turbine blade blank is in a free state.

The implementation of the above methods is carried out by using a numerical control machine tool.

The invention has the beneficial effects that:

1. adopt vertical one end fixed mode to compare with the fixed mode in current horizontal both ends, change fixedly, processing blank stress is on erectting the orientation, for horizontal middle part mode of sinking easier processing, the error is littleer, and the machining error that can reduce the not enough bringing of blade rigidity adds man-hour can improve its machining efficiency and precision, and this technology clamping scheme only needs a filling block simultaneously, can reduce the material loss.

2. Compared with the prior art, the method for milling and forming the blank at one time by adopting allowance can reduce the influence of the cutter on the machined blank during machining, and the rigidity of the machined blank is easier to maintain.

Drawings

FIG. 1 is a schematic view of a prior art turbine blade attachment;

FIG. 2 is a schematic view of a turbine blade attachment of the present invention;

FIG. 3 is a schematic cross-sectional view of a turbine blade and its remaining features in accordance with the present invention;

FIG. 4 is a schematic diagram of simulation of a cylindrical slender part by the process of the present invention;

FIG. 5 shows a workpiece (left side in the figure) and a test chart (right side in the figure) after a cylindrical slender part is machined by the process of the present invention.

Detailed Description

The invention is further illustrated with reference to the following figures and examples: