SU1657394A1 - Drill for treating composite materials - Google Patents

Abstract

The invention relates to the processing of materials by cutting and can be used for drilling composite polymeric composite materials. The purpose of the invention is to increase the productivity and quality of processing of composite materials with fibrous filler. For this, the cutting part is made in the form of a plate, the length of which in the diametral plane is larger than the diameter of the screw section. The auxiliary undercutting edges are located on the end of the plate opposite to the transverse cutting edge and are directed toward the shank. When drilling, cutting is done at the main cutting edges, and during the reverse course of the drill, the cutting edges eliminate shrinkage of the hole and cut the fibrous filler. 4 or №

Description

The invention relates to mechanical engineering, and more specifically to methods for processing materials by cutting, and can be used for drilling composite polymer composite materials (PCCM), consisting, for example, of successively alternating layers of various fillers, for example, fiberglass-organoplastic.

The aim of the invention is to increase the productivity and quality of processing of composite materials with fibrous filler.

1 shows a drill, a general view; figure 2 is a view of And figure 1; FIG. 3 shows the drilling process; figure 4 - the process of trimming.

The drill bit consists of a shank 1, the working part is a steel screw section 2 with chip grooves and a cutting part made in the form of a carbide plate 3. The carbide plate 3 is bonded by soldering (or glue) to a steel screw section 2 of a smaller diameter The cutting part of the drill has two main straight cutting edges 4, two auxiliary undercutting edges 5 (podreateli) and one transverse cutting edge 6 In this case, the auxiliary undercutting edges 5 are located on the opposite of the popper ary end cutting edge 6 of the plate 3 and directed towards the shank 1. The vertex podrezatelem offset from the drill shank axially to the amount used. The undercutting cutting edges are directed in the direction opposite to the main cutting edges.

ABOUT

ate VI

CJ

about

four

The drill works as follows.

Initially, with conventional feeding (FIG. 3), the material is drilled with the main cutting edges 4 with alternate cutting of layers, for example, fiberglass and organoplastic. The main cutting edges 4 have a rational sharpening geometry as applied to the processing of fiberglass. Auxiliary cutting edges 5 are not involved in the work. At the same time the layers formed by the organic filler, shrink and have a fleecy surface. During the reverse feed (Fig. 4), only auxiliary cutting edges 5, having a rational sharpening geometry in relation to the treatment of organoplastic, work. Sharp undercutters remove the areas of organoplastic layers that have been worn out and protrude beyond the surface of the treated surface without affecting the bulk of the glass filler.

Drill holes D 10 mm on a vertical drilling machine model 2H118 at a processing speed of V - 1.57 m / s and feed S 0.3 mm / rev. As a material to be processed, a combined fabric-woven PCM with a thickness of 40 mm, consisting of glass and organoplastic layers successively arranged in thickness, is used.

The PCCP tool is manufactured from high speed steel P6M5. The cutting part of which is made in the form of a plate of a hard alloy VK8, is sunk into a steel screw section.

When using the proposed design, the cutting speed and feed can be increased to the values of-Zm / s, .2 0.4 mm / rev, as in the first drill (with a straight tool feed, Fig 3), the entire load is perceived by the main cutting edges 4, the cutters practically do not contact with the abrasive layers of the glass filler and the preservation

their high cutting properties throughout the period of operability of the main cutting edges (30-40 min and more). During the reverse movement of the tool (Fig. 4), the cutters, without affecting the high abrasive layers of the material with glass filler, eliminate all shrinkage of the hole in the area of the non-abrasive material - organoplastic, perform the function of an additional drilling operation. accuracy and surface roughness,

In this way, the throughput performance of the holes in the PKKM is improved.

The optimal geometric ratios of the drill design elements are defined by D. e o

divided by the expression: - 1.5 - 2; d

at

5 B

11 -1.3: where b is the value

D 4

but

mixing, D is the nominal diameter of the hole; d is the outer diameter of the steel screw section of the working part, and the thickness of the carbide plate.

Claims (1)

Invention Form Composite Drill materials comprising a shank and a working part consisting of a screw section with chip grooves and a cutting part with two main straight cutting edges, two auxiliary undercutting edges and a transverse cutting edge, characterized in that. in order to increase productivity and quality of processing of composite materials with fibrous filler, The cutting part is made in the form of a plate, the length of which in the diametral plane is larger than the diameter of the screw section, while the auxiliary undercutting edges are located on the end of the plate opposite to the popgular cutting edge and are directed toward the shank.