RU67906U1 - FINGER FINGER PROFILE - Google Patents

Abstract

Profile finger milling cutter is designed for machining the face surfaces of gear teeth, gearing and deburring and chamfering. The mill contains a housing (1) with a shank (2) and a cutting part (3) made on it. The cutting part includes teeth (4), separated by chip grooves (5). The teeth (4) are made with a straight sharpened cutting edge (6) having an inclination angle λ, which is determined by the following relationship: λ = arctan (a cos φ / h ₃ ), where φ is the plane angle defined by the formula: φ = arctg ((bd _1/2 ) / h ₃ , a, b are auxiliary parameters, which are determined by the following relationships: d ₁ , d ₂ , d ₃ - the diametrical dimensions of the profile points, mm; h ₂ , h ₃ - axial dimensions of profile points, mm. 4 ill.

Description

The utility model relates to metalworking and can be used for machining the end surfaces of gear teeth, gearing and deburring and chamfering.

A finger profile milling cutter is known, comprising a housing with a shank and a cutting part made thereon, including teeth separated by chip grooves, the profile of which is formed by a flat curved line, the teeth being made backed up (Ordinartsev I.A., Filippov G.V., Shevchenko A .N., Onishko A.V., Sergeev A.K. Handbook of the toolmaker / Under the general editorship of I.A.Ordinartsev.M .: Mashinostroenie, 1987, p. 680).

These milling cutters are used to process the ends of the teeth of gears, namely gearing and deburring and chamfering.

A disadvantage of the known milling cutter is the low-tech design. The cutter contains backed teeth with a curved profile, which is difficult to ensure on a small diameter. This leads to difficulties in providing optimal rear angles. In this regard, these cutters are performed with a small number of teeth, which negatively affects the cutting conditions and the quality of processing.

The technical problem to which the utility model is directed is to increase the manufacturability of the cutter design, to provide optimal trailing angles and to increase the number of teeth, which allows to increase its durability.

This problem is solved by the fact that in the milling cutter finger profile containing the housing, with a shank and a cutting part made thereon, including teeth separated by chip grooves, the teeth are made with a straight sharpened cutting edge,

made with an angle of inclination λ, which is determined by the following relationship:

λ = arctan (a cos φ / h ₃ ),

where φ is the angle in the plan, determined by the formula:

φ = arctan ((bd _1/2 ) / h ₃ ),

a, b - auxiliary parameters, which are determined by the following dependencies:

d ₁ , d ₂ , d ₃ - the diametrical dimensions of the profile points, mm;

h ₂ , h ₃ - axial dimensions of profile points, mm.

The implementation of the milling finger profile teeth with straight sharpened cutting edges will simplify the processing of the rear surfaces of the teeth of the cutter by replacing the back of the curved profile with a flat sharpening. This will ensure a stable value of the rear angle and increase the number of teeth of the cutter. In turn, this will positively affect the processing conditions and will allow to increase the resistance period of the cutter. The implementation of the cutting edges rectilinear at an angle λ, determined by the given dependencies, will ensure the placement of points of the rectilinear cutting edge on the curved surface to be machined.

The applicant is not aware of finger profile milling cutters with the indicated combination of essential features and the claimed combination of essential features does not follow explicitly from the state of the art, which confirms the conformity of the claimed technical solution to the “novelty” condition.

The claimed technical solution is illustrated by drawings, where:

figure 1 - mill finger profile (General view);

figure 2 - design scheme;

figure 3 - diagram of the processing of the workpiece;

figure 4 - mill finger profile (the closest analogue).

A finger profile mill comprises a housing 1 with a shank 2 and a cutting part 3 made thereon. The cutting part includes teeth 4 separated by chip grooves 5. The teeth 4 are made with a straight sharpened cutting edge 6, which allows the rear surfaces of the cutter teeth to be machined by flat grinding. This will ensure a stable value of the rear angle and increase the number of teeth of the cutter, which in turn will positively affect the processing conditions and will increase the durability of the cutter.

The cutting edges of the 6 teeth of the cutter are made rectilinear at an angle of inclination λ, which is determined by the following relationship:

λ = arctan (a cos φ / h ₃ ),

where φ is the angle in the plan, determined by the formula:

φ = arctan ((bd _1/2 ) / h ₃ ),

a, b - auxiliary parameters, which are determined by the following dependencies:

d ₁ , d ₂ , d ₃ - the diametrical dimensions of the profile points, mm;

h ₂ , h ₃ - axial dimensions of profile points, mm.

Consider an example of determining the angle of inclination of the cutting edge. Let the profile of the surface to be machined be given the dimensions:

d1 = 8 mm

d2 = 10.94 mm

d3 = 16 mm

h2 = 6 mm

h3 = 12 mm

This profile can be provided with a finger profile mill with a radius cutting edge with a radius of R40.

We calculate the angle of inclination of the straight cutting edge, providing the specified profile, first determining the auxiliary parameters:

b = (February ⁸ (6 / 12-1) ^{2 2} 6 16 ^{2/12 2} -10.94 ²⁾ 12 / (4x6x8 (6 / 1.12) = 4.96;

φ = arctg ((4.96-8 / 2) / 12) = 4.576 °;

λ = arctan (6.276 cos (4.576 °) / 12) = 27.536 °.

The implementation of the cutting edges rectilinear at an angle λ, determined by the given dependencies, will ensure the placement of points of the rectilinear cutting edge on a curved surface to be machined.

The process of operation of the mill finger profile is as follows. The cutter is installed in the spindle of the gear-cutting machine, by means of the mandrel 7. The workpiece 8 is attached in a clamping device. After turning on the main cutting movement - the rotation of the cutter, she is informed of the feed movement along its axis. The teeth of the 4 cutters come into contact with the end edges of the teeth of the workpiece. Due to the inclination of the cutting edges 6 of the cutter during its rotation, they describe not a conical, but a curved surface, thereby removing the allowance along the profile of the depression between two adjacent teeth of the workpiece. After processing one cavity, the cutter is retracted, the workpiece makes a discrete rotation by one angular step, and the cutter is fed to process the next cavity. After machining the bevels on all the teeth, the workpiece is removed.

Claims (1)

Profile finger mill, comprising a body with a shank and a cutting part made thereon, including teeth separated by chip grooves, characterized in that the teeth have a straight sharpened cutting edge made with an inclination angle λ, which is determined by the following relationship: λ = arctan (a cos φ / h ₃ ), where φ is the angle in the plan, determined by the formula: φ = arctan ((bd _1/2 ) / h ₃ ), a, b - auxiliary parameters, which are determined by the following dependencies:

d ₁ , d ₂ , d ₃ - the diametrical dimensions of the profile points, mm; h ₂ , h ₃ - axial dimensions of profile points, mm.