Tool for clamping large Venturi tube free forging blank vertical lathe

Abstract

The invention discloses a tool for clamping a large Venturi tube free forging blank vertical lathe. The tool comprises a hoisting pre-positioning clamp and a vertical lathe clamping jaw, wherein the hoisting pre-positioning clamp is used for hoisting a Venturi tube forging blank and pre-positioning the Venturi tube forging blank to a vertical lathe workbench, and the vertical lathe clamping jaw isinstalled on the vertical lathe workbench and used for clamping the outer circle of the Venturi tube free forging blank; the vertical lathe clamping jaw comprises a clamping jaw base used for being connected with the vertical lathe workbench and a clamping jaw body which is arranged on the clamping jaw base and can conduct movable clamping; the milling and jacking assembly used for cutting into the surface of the Venturi tube free forging blank in a milling mode and jacking the surface of the blank is arranged at the front end of the clamping jaw body; the milling and jacking assembly comprises a milling cutter disc; and the milling cutter disc is driven by a motor and a self-locking type speed reducing mechanism to rotate. By means of the tool, the clamping alignment and cutting efficiency is improved, the machining quality is improved, and the machining safety is improved.

Description

technical field [0001] The invention relates to the technical field of mechanical processing equipment, in particular to a tooling for vertical lathe clamping of a large Venturi tube free forging blank. Background technique [0002] Venturi tubes are widely used as flowmeters in the field of fluid measurement. The high-precision Venturi tube flowmeter used in a large-scale advanced pressurized water reactor and high-temperature gas-cooled reactor nuclear power plant is used in a major national project due to high pressure and strict reliability requirements. It is made of stainless steel forging blanks (such as figure 2 shown in item 1). The stainless steel forging belongs to the multi-variety and small-batch manufacturing mode. The blank is manufactured by free forging. After the blank is forged, it needs to be machined into finished parts of the Venturi tube. [0003] In the prior art, since the rough surface of the large venturi tube manufactured by free forging is extr...

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Problems solved by technology

[0003] In the prior art, since the rough surface of the large venturi tube manufactured by free forging is extremely uneven, when using conventional vertical lathe jaws for clamping, the contact between the vertical lathe jaws and the outer circle of the workpiece is mostly Local point contact, its clamping is very unstable; the instability of this clamping will lead to the following problems:

[0004] One is that it is easy to cause the workpiece to be shifted twice when it is clamped after alignment, which requires repeated alignment, thereby reducing the efficiency of clamping

[0005] The second is that due to the clamping and displacement factors, the workpiece cannot be accurately aligned. On the one hand, the variation in the local machining allowance of the outer circle of the forging is relatively large, which prolongs the number of tool passes and increases the cutting time of the fur. Increased tool loss; on the other hand, there are also cases where less fur is cut off in the outer circle of the forging, which is likely to cause defects on the shallow surface of the blank that should have been turned off to remain on the workpiece, thus affecting the quality of the product

[0006] The third is that due to the unstable contact between the jaws and the workpiece, the clamping force is small, and only a small amount of cutting can be used for processing, resulting in a decrease in processing efficiency, and the workpiece is prone to loosening due to the influence of cutting force changes during processing. Security risks

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