SU1349975A1 - Lapping device for machining holes - Google Patents

Abstract

The invention relates to the field of metalworking, namely to an instrument for lapping high-precision o-. Versions. The aim of the invention is to improve the processing quality of small-diameter holes by increasing the stiffness of the lap in the transverse direction. On the outer surface of the sleeve 1 priter, mounted on a conical mandrel, make an even number of grooves. The cut and grooves are evenly distributed in the sections of the lap with the greatest thickness of the wall and with the smallest of its thickness. Two slots 4 and 5 extend from one point T located diametrically. opposite to the section in section with the greatest wall thickness. 4 il. p p - / OE Gt / A / CD D cl

Description

The invention relates to the field of metal working, namely to a tool for machining high-precision holes, and can be used for abrasive and electrochemical grinding of cylindrical holes.

The purpose of the invention is the superior quality of machining of small-diameter holes by increasing the stiffness of the lap in the transverse direction.

FIG. 1 shows the lap, general view; - FIG. 2 is a section A-A in FIG. one; in fig. 3 - section BB on

FIG. one; in fig. 4 - sweep outer 5 bone sections of the shirt, for example

and grooves, i.e. with equal groove 4 and 5, 20

25

surface lapping.

The lap for machining the holes contains a sleeve 1 mounted on a conical mandrel 2. On the sleeve 1, the cut is made 3 evenly, in angular steps. The two oppositely incised sections extend from one point T, which is diametrically opposite to section 3, and are inclined in different directions. The remaining grooves 6 and 7 are also inclined,

Consider the lateral deformation of the lap during unclamping during its operation. Sections of the inner surface of the priter near the cut under the grooves tightly in contact with the mandrel. In the extreme sections, the lap is divided into equal length segments: in section A-A - into four 5B section B-B - on five. In any other section there are five segments, for example in section Sh (Fig. 4) .

Consider the shirt stiffness in cross sections x.a-a and bb. Taking into account that these sections are divided into equal segments, consider one of them - DC and EF (Fig. 4). The DC segment has a greater wall thickness H ,, than the thickness H of the EF segment. But due to the fact

thirty

40

,, what

the number of segments in the cross section is less than in the section B-B and due to the small amount of taper, the length of the DC segment is significantly greater than the length of the EF segment. Consequently, the rigidity of the latter is increased compared to the lapings, which have the same number of grooves or segments in the outer sections of the shirt.

Consider an intermediate section

45

50

The CEFDs located between the groove incisions are almost identical.

The proposed instrument is a region of increased rigidity. Known prichiry with high hardness, for example, solid, provide high accuracy of processing and in the intensity of the correction of landings of geometric shape. Poe proposed grounding ensured accuracy and performance.

The proposed design is most efficient in the use of abrasive grinding of deep psionic holes of small diameter (5,., 20 mm). This is due to the processing of this range of holes, forced to use thin-walled lap, possessing a low and variable length of bone.

Claims (1)

Formula inventions Lapping for machining a hole containing a sleeve installed on a mandrel with a section not intersecting obliquely tangent outer surface is paralleled so as to improve the quality of small diameter holes, an even number of grooves are implemented in the sections of the lapping with the least groove wall thickness are evenly spaced peri, and in section from the largest wall, diametrically opposed priter, for example .MN (FIG. 4), Section, there are two slots. MP, PQ, LR and RN ki have equal lengths. The lengths of these sections are less than the length of the corresponding segment segments in the AA section, for example, CD. Therefore, these sections are also significantly different from the stiffness of the pritier sections in section A – A. The QL section is shorter than other sections of the MNj section, so its rigidity is also high. Thus, as a result of the proposed implementation of inclined grooves on the outer surface of the shirt, gesture 0 five 0 The CEFD, located between the grooves, and the cuts is almost the same. The proposed tool has increased rigidity. It is known that prichiry with high rigidity, such as solid, provide high precision machining and high intensity correcting errors of geometric shape. Therefore, the proposed priter provides increased accuracy and performance. The proposed lapping design is most efficiently used for abrasive lapping of deep precision holes of small diameter (5,., 20 mm). This is due to the fact that for processing this range of hole diameters forced to use thin-walled laps, having low and variable stiffness along the length. Invention Formula A lapping for machining of holes, containing a sleeve mounted on a conical mandrel with a cut and with not intersecting slots inclined to the generatrix of the outer surface, is similar to the fact that, in order to improve the quality of machining of small-diameter holes, an even number of slots is filled on the sleeve, while the lapping sections with the smallest and largest walls are grooves and a cut evenly spaced around the perimeter, and in the section with the largest wall diametrically opposite cut, there are two slots. fpu2.2 X Fi.Z