SU997993A2 - Boring bar - Google Patents

Description

The invention relates to metal working, in particular, to finishing boring of holes and trimming of end surfaces.

According to the main auth. No. 677818 is a known boring bar consisting of a housing in which the toolholder and the balance bar are mounted with the possibility of radial movement from the central KOSOV slaughter rail in opposite directions. In addition, the boring bar is provided with a discharge device for balancing the centrifugal force arising during operation. The unloading device is made in the form of two elastic elements, one of which is equipped with the ability to interact with the boring body and the tool holder, and the other with the boring body and the balance bar l.

However, this design has drawbacks.

When processing wide end surfaces, i.e. when the toolholder and balance bar are moved by a large amount, which usually leads to the transfer of the toolholder and balance bar's center of gravity through the axis

twelve bolts, the centrifugal force Rc changes its direction, i.e. vector sum Pi ipp Ap-icons-t. This leads to the fact that when the centering point of the toolholder and balance bar moves through the rotation bar oqb, the total force DR changes its sign, which leads to a shock bulkhead of the gaps in the gear rack,

10 jump toolholder and balancer.

This, in turn, leads to the formation of risks on the treated surface, i.e., to a reduction in the quality of processing, and in some cases such a jump leads to breakage of the tool. Moreover, the jump occurs the faster, the load on the slats and the cutter are the higher, the greater the force of the elastic element.

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The aim of the invention is the expansion of technological capabilities,. improving the accuracy and quality of processing wide end surfaces.

The goal is achieved by the fact that the boring bar is equipped with movable

Claims (2)

perpendicular to the direction of movement of the toolholder and balancer by spring-loaded sliders, one of which is installed with the possibility of interaction with the central radial-travel axle rail and the tool holder, and the other with the central rail and balance bar. The flat slats, rigidly fixed on the balance bar, are made of a squint and have a triangular profile in cross section. The said central rail of the radial displacement gear is made with the possibility of self-installation in the direction parallel to the action of the elastic elements. Figure 1 shows the described borax, a longitudinal section; in Figure 2, an incision L-A in figure 1 along the engagement of oblique slats; in FIG. 3, section B-B in FIG. 1, in FIG. 4, section B-B in FIG. 3. FIG. In case 1, the boring bars are positioned with the possibility of radial movement of the tool holder 2 with the cutter 3 and the balance bar 4 with flat helical helical teeth fixed in them having a triangular profile in cross section, the rails 5 and 6. These rails interact with the central rod 7 of the radial movement actuator (not shown). In the tool holder 2 and the balancer 3, sliders 8 are mounted, which cooperate with elastic elements 9. A groove 10 is made in the housing 1, in which the central rail 7 is mounted with the possibility of self-alignment in the direction of the elastic elements 9. The cover 11 is rigidly fixed in the housing 1. In the cover 11 mounted boring cutter 12. The device operates as follows. -, -, After the end of the bore produced by the cutter 12 fixed in the cover 11, a radial movement drive is activated which moves the central rail 7 along the axis of the boring bar. The flat oblique rails 5 and 6 interacting with it overlap together with the tool holder 2 and the balance rum 4 in opposite directions. The cutter 3 performs processing. Since the teeth of the rails have a triangular profile in the transverse section, the elastic element, by moving the center rail 7, provides contact on both sides of the profile. The central rail 7 is located in the groove 10, which does not allow it to-. move in the direction of the centrifugal force. The forces of the elastic elements 9 are perceived by the back of a triangular tooth. In the event that the centers of gravity of the toolholder and balance bar go over the axis of rotation of the boring bar and the centrifugal force changes its direction, the elastic elements 9 maintain contact in the teeth x along two planes, which leads to the absence of a gap in the teeth x, and therefore eliminates the impact bulkhead of the gaps in the pinion gearing and the jump of the cutter 3. The technical and economic effect of using the invention is to improve the accuracy and quality of processing of wide end surfaces. The invention claims 1. Borstanga auth.St. No. 677818, characterized in that, in order to diversify technological capabilities, it is equipped with movable perpendicular to the direction of movement of the toolholder and the balancer under the spring-loaded sliders, one of which is installed with the possibility of interaction with the central rail of the drive of the radial movement and the cutter holder, the other is with a de-neutral rail and balance bar. 2. Borstanga, according to claim 1, about tl and chaiyu and d so that the flat slats, rigidly fastened on the balancer, are kosozubymi and having in cross section a triangular profile. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 677818, cl. B 23 B 29/03, 1977. f 7 1 / / / l ± 1 5 10 jig (Fig.