Changeable built-in live center

Abstract

The invention provides a replaceable built-in movable tip, comprising a base shell, a front end cover, a rear end cover, a tip shaft arranged in the base shell and a tip head arranged on the tip shaft, wherein, a cylindrical ball bearing is arranged between the front end of the tip shaft and the base shell; the rear end of the tip shaft is provided with a needle roller bearing and a deep groove sealing bearing; one side of the cylindrical ball bearing is provided with an adjusting cushion; a pushing force centering ball bearing is arranged between the step surface of the middle part of the tipshaft and the step surface matched with the internal side of the base shell; the rear end surface of the pushing force centering ball bearing is uniformly provided with at least three groups of elastic components; the tip head is a replaceable and movable component and fixed on the tip shaft by tightening screws. The replaceable built-in movable tip has an extension end with short cantilever, good rigidity, long service life, large bearing weight, high precision, good processing technology and replaceable tip head, facilitates the replacement and maintenance, saves the middle bracket, greatlyreduces the production cost, and improves the market competitiveness of the enterprises.

Description

technical field [0001] The invention relates to heavy-duty roll machinery and equipment, in particular to a replaceable built-in live top used for heavy-duty roll machinery and equipment. technical background [0002] At present, most of the centers used on heavy machine tools such as roll machinery in the market are dead centers. During the grinding process, the two center holes of the workpiece are easily damaged, the bracket is worn, the processing standard is lost, and the processing accuracy cannot be guaranteed. The existing The live center is mostly used in small equipment due to limited load-bearing and difficult support. The live center usually adopts rolling bearings. The clearance of the rolling bearing makes the rotation accuracy of the live center itself unable to meet the processing accuracy requirements. In addition, its parts are easy to wear and tear. Short life and low cutting efficiency lead to high production costs, which cannot meet the needs of enterpri...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the centers used on heavy machine tools such as roll machinery in the market are dead centers. During the grinding process, the two center holes of the workpiece are easily damaged, the bracket is worn, the processing standard is lost, and the processing accuracy cannot be guaranteed. The existing The live center is mostly used in small equipment due to limited load-bearing and difficult support. The live center usually adopts rolling bearings. The clearance of the rolling bearing makes the rotation accuracy of the live center itself unable to meet the processing accuracy requirements. In addition, its parts are easy to wear and tear. Short life and low cutting efficiency lead to high production costs, which cannot meet the needs of enterprise production and restrict the development of enterprises

In the prior art, the shaft arm at the tip is relatively long, and generally the shaft arm is set at the outer end of the equipment, which increases the force on the shaft arm and cannot withstand the use of large-tonnage equipment; the top head cannot be replaced, and its bearing capacity Small, when the bearing capacity is greater than 50 tons, the damage rate of the tip increases, which cannot meet the normal production needs

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