RU38667U1 - SPLITTED FIRMWARE - DRAWER REMOVAL - Google Patents

Abstract

A slotted broach for deburring on the profile of a splined hole, containing a guide and cutting parts made with cutting lateral edges, having at least one tooth with a front angle γ of the plane of symmetry of the tooth, characterized in that the guide and cutting parts are made with deformation slots filled with a dense flexible mass, the angle of inclination of the cutting lateral edge is greater than the front angle γ of the plane of symmetry of the tooth used for this material, and the front angle γ along the normal to the cutting sides the edge is expressed by the relation tgγ = tgγ · sinω, where γ is the rake angle normal to the cutting lateral edge; γ is the rake angle in the plane of symmetry of the tooth; ω is the profile angle.

Description

The utility model relates to mechanical engineering and can be used to remove burrs on the profile of a spline hole formed when cutting annular internal grooves after the operation of pulling a spline hole or after chamfering from the end profile of the spline hole.

Known spline broach (and.with. No. 1547976, M CL B 23 D 43/00, Bull. No. 9, 03/07/1990) containing inclined cutting teeth designed for precision processing of the side surfaces of the splined hollows.

A design drawback is that a semi-automatic broaching machine is required for broaching, while the broaching should be with shanks, which unnecessarily lengthens the tool and increases its costs, and for complete deburring without resizing the finished machined splined hole, several broaches made with different thickness of the tooth in the range; tolerance fields for the tooth thickness of the part.

Slotted firmware is known (see the Handbook of a designer-toolmaker. M., "Mechanical Engineering", 456 pp., S. P. 366, 1975) used to calibrate and eliminate various deformations

holes containing a spline guide, cutting and gauge parts, while the guide and the cutting parts made with cutting side edges have at least one tooth with a rake angle y in the plane of symmetry of the tooth.

A disadvantage of the known design is that for complete deburring without resizing the finished machined spline hole, it is necessary to use several firmwares made with different tooth thicknesses within the tolerance range for the tooth thickness of the part.

The problem to be solved: improving the quality of processing of splined holes and providing the possibility of processing them with one tool without changing the dimensions of the part.

This problem is solved in that in the specified slotted broaching firmware for deburring, comprising a guide and cutting parts made with cutting lateral edges, having at least one tooth with a rake angle γ in the plane of symmetry of the tooth, the guide and cutting parts are made with deformation slots filled with a dense flexible mass, the angle of inclination of the lateral edge of the cutting part of the tooth is greater than the rake angle γ in the plane of symmetry of the tooth used for this material, and the rake angle γ 'is normal to the cutting the side edge is expressed by the dependence:

tgγ '= tgγ · sinω,

where: γ 'is the rake angle normal to the cutting side edge;

γ is the rake angle in the plane of symmetry of the tooth;

ω is the angle of the profile.

Distinctive features of the proposed broach firmware from the one closest to the above are the presence of deformation slots made in the guide and cutting parts, which are filled with a dense flexible mass to increase the stability of their own dimensions and the result of processing, as well as the implementation of the cutting side edge intended for better cutting of burrs, with an increased angle of inclination compared with the rake angle y in the plane of symmetry of the tooth used for this material.

The applicant does not know the broach firmware designed to remove burrs on the profile of the splined hole formed when cutting the annular internal grooves after pulling the splined hole or after chamfering from the end of the profile of the splined hole, with the indicated combination of essential features and the claimed combination of essential features does not explicitly follow from the modern level of technology, which confirms the compliance of the proposed technical solution to the condition of "novelty."

The claimed technical solution is illustrated by drawings, where:

figure 1 is a main view of the proposed slotted firmware broach for deburring;

figure 2 - section aa in figure 1;

figure 3 is a section bB in figure 1;

figure 4 - section bb in figure 3;

5 is a section GG in figure 3;

6 is a workpiece;

Fig.7 is a section DD in Fig.6;

A slotted broach firmware for deburring consists of a mandrel 1 and the firmware 2 itself, attached to it with screws 3. Firmware 2 contains a guide part 4 and a cutting part 5, and has deformation slots 6, which are filled with a dense flexible mass 7.

The guide part 4 and the cutting part 5 have at least one tooth 8 with a rake angle γ in the plane of symmetry of the tooth. The angle of inclination of the cutting lateral edge 8 is greater than the rake angle γ in the plane of symmetry of the tooth used for this material. The rake angle γ 'normal to the cutting side edge (in the case of involute splines, it will be variable) is expressed by the dependence:

tgγ '= tgγ · sinω,

where: γ 'is the rake angle normal to the cutting side edge;

γ is the rake angle in the plane of symmetry of the tooth;

ω is the angle of the profile.

Consider the process of processing parts 9 of the inventive slotted firmware broach for deburring 10.

The broaching firmware is inserted by the guide part 4 into the workpiece 9 and is compressed due to the presence of deformation slots 6 to the thickness of the slots of the workpiece installed on the press table (not shown). Further, during the working progress of the broaching-pulling down, the cutting part 5, compressed to the thickness of the slots of the workpiece by means of the guide part 4, tightly adhering to the side surfaces of the slots, completely removes burrs 10 along the profile of the slots. To increase the stability of the intrinsic dimensions of the slotted broaching firmware and the processing result, the deformation slots 6 are filled with a dense flexible mass 7.

The claimed technical solution provides high-quality processing of splined holes with one tool without changing the size of the workpiece.

Slot-flashing firmware for deburring can be performed on standard equipment using modern materials and technologies.

Claims (1)

A slotted broach for deburring on the profile of a splined hole, containing a guide and cutting parts made with cutting lateral edges, having at least one tooth with a front angle γ of the plane of symmetry of the tooth, characterized in that the guide and cutting parts are made with deformation slits filled with a dense mass of flexible, the angle of inclination of the cutting edge of the longer lateral rake angle γ plane of symmetry of the tooth to be used for a given material and a rake angle γ ^'normal to the cutting side howling edge expressed by the relation tgγ ^' = tgγ · sinω, where γ ^' is the rake angle normal to the cutting side edge; γ is the rake angle in the plane of symmetry of the tooth; ω is the angle of the profile.