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1、Spindle headstockInventors:Vasilchenko, Georgy A.Abstract:：A spindle headstock of a multiple-operation machine tool, whose housing accommodates, in a coaxial and rotatable arrangement, a spindle kinematically coupled to a rotary drive, a tie rod carrying members intended for connection to the shank

2、of a boring head having a swivel carriage, which tie rod is axially adjustable in relation to the spindle, and a bar carrying toothed members for meshing with toothed members mounted on an end of a slide bar whose opposite end serves for radial displacement of the carriage. The bar is kinematically

3、coupled to a drive whereby it is displaced in the axial direction in relation to the spindle. The members of the tie rod, which serve for connection to the shank of the boring head, are mounted on the tie rod so that they can radially reciprocate during location of the tie rod. For radial adjustment

4、 of the bar, a bushing is provided on the tie rod, which is axially stationary in relation to the tie rod and kinematically coupled to the spindle and bar. FIELD OF THE INVENTION The present invention relates to the manufacture of machine tools and is more specifically concerned with spindle headsto

5、cks. The spindle headstock in accordance with the invention is best applicable to the machining of holes of complicated cross-sectional shapes on multiple-operation machine tools with automatic tool changers. BACKGROUND OF THE INVENTION There is known a spindle headstock of a multiple-operation mach

6、ine tool, comprising a housing which accommodates in a coaxial and rotatable arrangement, a spindle, a tie rod, and a bar. The spindle is hollow and kinematically coupled to a main drive. It accommodates a shank of a mandrel of a boring head. The shank is provided with an external tooth rim at one o

7、f its ends, which is intended to mesh with an internal tooth rim provided at the end of the tie rod. The tie rod is kinematically coupled to a drive by means of which it is axially located and the tooth rims of the shank of the boring head and of the tie rod mesh with each other. The tie rod can be

8、turned for location relative to the spindle through an angle such that the teeth of the tooth rims are brought to a position one opposite another. Inside the tie rod there is a bar kinematically coupled to a drive which moves it in the axial direction. At one end of the bar there is an internal toot

9、h rim which serves to mesh with an external tooth rim at one end of a slide bar whose opposite end serves to convert the translation motion of the bar in the axial direction to radial motion of the carriage.In order to bring the teeth of the tooth rims of the bar and slide bar in a position opposite

10、 one another, the bar is kinematically coupled to the tie rod so that the two can rotate simultaneously for location （cf. USSR Inventors Certificate No. 933,290）.In this spindle headstock, the shank of the mandrel of the boring head is coupled to the tie rod by means of a spline joint. This joint ca

11、nnot provide for an accurate location of the boring head, because it is impossible to eliminate clearances between the teeth. The resultant bending moment causes deformation of the mandrel of the boring head and of the spindle, which affects the machining accuracy. A removal or loosening of the shan

12、k may disturb the correct angular positioning of its teeth, which, in turn, may be the cause of an accident. The manufacture of a tooth rim for the shank, which would always provide for an accurate angular orientation, involves a number of serious difficulties. SUMMARY OF THE INVENTION It is an obje

13、ct of the present invention to improve the accuracy of location of the mandrel of the boring head in the spindle and make its clamping more secure. It is another object of the invention to provide for a longer service life of spindle headstocks. It is a further object of the invention to expand the

14、range of application of machine tools.The invention provides a spindle headstock of a multiple-operation machine tool, comprising a housing which accommodates, in a coaxial and rotatable arrangement, a spindle kinematically coupled to a main drive, a tie rod carrying members for connection to a shan

15、k of a boring head having a swivel carriage, the tie rod being adjustable in the axial direction in relation to the spindle, and a bar carrying toothed members intended to mesh with toothed members mounted on an end of a slide bar whose opposite end serves for radial displacement of the carriage, th

16、e bar being kinematically coupled to a drive which moves it in the axial direction in relation to the spindle, the spindle headstock being characterized, according to the invention, in that the members of the tie rod, which are intended for connection to the shank of the boring head, are mounted on the tie rod so that they can reciprocate in the radial direction during location of the tie rod, and in that a bushing is mounted on the ti