SU1152794A1 - Broaching tool for working openings - Google Patents

Abstract

.THE SURFACE TREATMENT, including a front guide, on which a tapered lead-in part with chip-making grooves, and a cutting part with rough, finishing and calibrating teeth, are made, in order to improve the accuracy and quality of machining of holes with internal rings grooves, chip-making grooves of the tapered lead-in part are made longitudinal, while the draft teeth are grouped into two sections with the same number of them in each, with equal lift and diameters of the first teeth, with the first section having chip breaking grooves matching the direction from the chip cutting grooves of the lead-in part located on the same diameter and equal in width to them, calculated by the formula b

Description

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The invention relates to metalworking and can be used when machining holes with internal annular grooves.

Surface treatments are known, including the front guide, on which the lead-in part with the longitudinal chip grooves and the cutting part 1 are made.

The disadvantages of these grooves are the low accuracy and quality of the machining of holes with internal annular grooves, since no direction is provided for the first roughing teeth.

The purpose of the invention is to improve the accuracy and quality of machining holes with internal annular grooves.

Delivered del is achieved by the fact that in the surface treatment, including the front guide, on which there is a tapered feedthrough with chip-making grooves, and a cutting blade with rough, finishing and calibrating teeth, the chip-making grooves of the tapered feedthrough are longitudinal, the draft teeth are grouped into two sections with the same number of them in each, with equal elevation and diameters of the first teeth, with the chip section grooves in the first section coinciding in the direction with chipbreaker grooves of the lead-in part, located on the same diameter and equal to them in width b, calculated by the formula

B (0.8-1) 1, where b is the width of the chip separating grooves;

-the length of the cutting edge of the tooth.

FIG. 1 shows a hole for machining holes with internal annular grooves, a general view; in fig. 2 is a section A-A in FIG. one; in fig. 3 is a section BB in FIG. one; in FIG. 4 a section BB of FIG. one.

The stretch 1 consists of a shank 2, a front guide 3 with a tapered lead-in part 4 and longitudinal grooves 5, a cutting part 6 consisting of two sections 7 and 8 of roughing teeth, finishing 9 and calibrating teeth 10, a rear guide 11 and deforming ring 12.

On the section 7 of the roughing teeth there are chip breaking grooves 13, the depressions of which are located on the same diameter Dan, with grooves 13 being made without displacement relative to the grooves 5. In addition, the width and number of grooves 5 and 13 are equal. On section 8, the draft teeth are made solid, without chip breaking grooves.

The number of draft teeth on sections 7 and 8 is made equal, with the diameters of the first teeth of each section and the raising of the teeth also made the same.

The width of the chip separating grooves 5 and 13 is calculated using the formula 0b (0.8-1).

where b is the width of the chip breakers;

 - the length of the cutting edge of the tooth. Finishing teeth 9 are separated by chip codes 5, staggered 14.

The process works as follows.

By pulling the hole, the front guide 3 of the draw 1 pushes the holes in the walls of the grooves, which serve as guides for the teeth of the cutting part 6. The draft teeth of the sections 7 during the cutting process remove the chips, and the chip grooves 13 on the surface of the hole constitute stiffeners axial bores that prevent lateral displacement of the bore when the draft tooth hits the annular groove of the hole.

Draft teeth of section 8 of the cutting part

0 b cut the stiffeners formed by the teeth of section 7, since the total width of the chip grooves on each of the roughing teeth of the first section of the cutting part is related to the length of the cutting edge

the interval is 1-0.8, the volumes of the chips cut by the sections of the teeth 7 and 8 of the cutting part 6 are approximately the same, which ensures the same load of the teeth of the cutting part 6.

Further machining of the hole is carried out by finishing 9 and calibrating 11) teeth and a deforming ring 12, which provide the required cleanliness of the hole being machined.

The proposed design of the spigot pvsvllyaet sharply reduce the magnitude of the bending stresses in the body of the spindles, and also provides direction for the first roughing teeth, which improves the accuracy and quality of processing

0 holes with internal annular grooves.

Fig-5

8-B

FIG L

Claims (1)

. SURFACE HANDLING, including the front guide, on which the conical entry part with chip-cutting grooves is made, and the cutting part with rough, finishing and calibrating teeth, characterized in that, in order to improve the accuracy and quality of processing holes with internal annular grooves, chip control grooves of the tapered lead-in part are made longitudinal, while the rough teeth are grouped in two sections with the same number of them in each, with equal elevations and diameters of the first teeth , Wherein the first sections are made struzhkodelitelnye grooves coinciding with the direction of grooves struzhkodelitelnymi filar portions disposed on the same diameter and equal to them in shirine, calculated according to the formula B = (0.8-1) 8, where C is the length of the cutting edge of the tooth.