A kind of preparation method and device of cup-shaped flexspline

Abstract

The invention discloses a preparation method of a cup-shaped flexible wheel and a device thereof. A circular slab is tightened at the end of a core die by a tail top. A positive wire of a pulse powersupply is connected with the core die, and a negative wire is directly connected with each rotary wheel of a rotary wheel assembly. The circular slab is first spun and deformed into a cup-shaped workpiece with both inner and outer walls being straight walls by one rotary wheel. Then the cup-shaped workpiece is spun and deformed into two thickened cup-shaped workpieces with different straight wallthickness by another two rotary wheels, and a thicker smooth section is used as a tooth profile reserved section. Finally, the tooth profile reserved section is spun by one toothed rotary wheel to form a circle tooth profile around the outer circumference. At last, a small amount of cutting process is carried out to complete the processing process from the circular slab to the cup-shaped flexiblewheel workpiece. According to the cup - shaped flexible wheel manufacturing process based on plastic forming, streamline formed in the process of deformation can be completely retained, and the service life of parts is prolonged advantageously. The advantage of the method is more obvious for flexible wheels with an extremely small thickness.

Description

technical field [0001] The invention relates to the processing of harmonic flexible gears (flex splines for short), in particular to a method for preparing a cup-shaped flex spline and a device thereof. Background technique [0002] Harmonic gear reducers have been used in a wide range of fields such as aviation, aerospace, robots, etc., and the flexible gears are basically cut by bar to obtain blanks, and then cut gears. Because the wall thickness of the cup-shaped blank is very thin, the toothless part is even only 0.4mm, and the tooth bottom wall thickness of the toothed part is often only 0.7mm. Therefore, the cutting process is used to process this thin-walled cup-shaped blank, and then cutting The method cuts out the tooth profile, which not only cuts off the internal fibers of the material, thereby reducing the strength and fatigue life of the workpiece, but also because the rigidity of the blank is too low, it is not easy to be firmly clamped on the machine tool, and...

AI Technical Summary

Problems solved by technology

Because the wall thickness of the cup-shaped blank is very thin, the toothless part is even only 0.4mm, and the tooth bottom wall thickness of the toothed part is often only 0.7mm. Therefore, the cutting process is used to process this thin-walled cup-shaped blank, and then cutting The method cuts out the tooth profile, which not only cuts off the internal fibers of the material, thereby reducing the strength and fatigue life of the workpiece, but also because the rigidity of the blank is too low, it is not easy to be firmly clamped on the machine tool, and the cutting process can easily cause the size of the part to be out of tolerance, resulting in High scrap rate and high processing cost

[0003] In terms of electroplastic spinning forming devices, either the two poles of the power supply are respectively loaded on the blank and the tail ejector rod, and the closed-loop loop of power supply formed cannot make the point contact area between the spinning wheel and the blank a strong electroplastic area, and more Spinning is performed by using the electrothermal effect instead of the electroplastic effect, so it cannot fully exert the effect of improving the plasticity of the material

Either the two poles of the power supply are respectively loaded on the mandrel (or chuck) and the wheel arm (or handle), and the space between the wheel and the wheel arm is usually lubricated by various greases, and its insulation effect will inevitably lead to narrow current channels In turn, the local contact resistance increases, resulting in an increase in the temperature of the internal bearing of the rotary wheel and a sharp shortening of the life, that is, the electrothermal effect is not applied to the blank but is mistakenly applied to the bearing of the rotary wheel

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