The method of forming helical surfaces of constant pitch for products with feasibility heart

 

(57) Abstract:

The invention relates to mechanical engineering and can be used for processing spiral surfaces of constant pitch for products with feasibility core, for example, tassonyi drills. The product reported a helical movement. The tool rotate simultaneously moved away from the axis of the product. Making the surface of the tool is made in the form of a sphere. The tool away from the axis of the product by rotating around the center of the producing spherical surface. Thus the coordinates of the points of the cutting edge for screw front surface should satisfy the condition:

< / BR>
where m0- the shortest distance between the axes Z and Zandmmz- the rotation angle of the coordinate system Xand, Yand, Zandaround the axis of the piece, glad, RSFis the radius of the manufacturing sector, mm; r0polar coordinate of the calculated point of the cutting edge, mm; is the polar angle calculated point of the cutting edge, I am glad; Z0the calculated coordinate point of the cutting edge Zandmm; half angle at the apex of the conical core details, glad; R - helical option /p = P/2, where R - step helical surface, mm; X, Y, Z - coordinates of the points p is tion core with big differences in the diameters of the desired front corners and the front screw surface receive one tool with a spherical profile. In addition, the invention makes it possible to calculate the coordinates X, Y, Z points Rioja edge products with feasibility core. 2 Il.

The invention relates to the field of engineering, namely, the processing spiral surfaces on the product, the feasibility of the core, for example, shaped countersinks with helical chip grooves.

A method of processing spiral surfaces of constant pitch on the product, the feasibility of the core, in which the rotating tool and the workpiece and progressively move the product along its axis in concert with the removal of the tool from the workpiece and is moved by turning it about the axis passing through the center of the arc of a circle approximating theoretical profile of the disk tool and perpendicular to the plane lying on the axis of the above-mentioned tool and on the line of the shortest axial distance [1].

The disadvantage of this method is the inability to handle a large number of teeth products with small steps helical surface due to cutting tools of the backrest adjacent teeth due to the lack of additional turning movements of products, providing accurate is the train method of processing spiral surfaces on products with feasibility core on which the processing tool and product inform rotation and the exercise of their relative movement along the axis of the product, consistent with the removal of the tool from the workpiece and its rotation, and the rotation of tool carry around an axis, the component forming tool angle equal to the front corner of the product, and intersecting at a point spaced from the edge of the tool at a distance [2].

The disadvantage of this method is to obtain enough accurate profile of the helical surface due to the continuous changes of the settings of the tool during its removal from the workpiece in accordance with the change of the bottom of the groove. Another drawback of this method is the low processing performance spiral surfaces, because the additional movement of retraction and rotation of the instrument will fluctuate because of changes in the profile of the bottom of the grooves and angles of the cutting edge products are communicated to the tool with greater speed, and the addition of these movements leads to low performance.

In addition, to implement the method, which describes the movement of retraction and rotation are performed by the tool requires banking entities to the invention is a method of processing spiral surfaces on products with feasibility core which instrument in the process tell rotational movement, and the product - translational and rotational about its axis and agreed with the screw turning movement around the center of the spherical surface [3].

The disadvantage of this method is the necessity of designing and manufacturing special tools for the implementation of the morphogenetic movements during the formation of the screw of the front surface and the cutting edge.

The technical problem on which the invention is directed, is that for products with the feasibility Serafini with big differences in the diameters of the desired front corners and the front screw surface receive one tool (grinding wheel) with the profile belonging to the field. Circle after the edits only changes its diameter, and the profile it belongs to the same sphere, it does not change the conditions of formation of the helical surface and allows for the re-save (restore) screw the front surface and the cutting edge.

The problem is solved in that the tool and the product reported by the rotation and the exercise of their relative movement along the axis of the product, sagastume.

In Fig. 1 shows a diagram of the installation tool, for example, grinding wheel, when the processing of the front helical surface, for example, shaped diverticulum, with feasibility core and a method of removal of the tool from the axis of the product by the rotation of the tool around the center of the sphere, which belongs to his profile.

In Fig. 2 shows the coordinate system of the instrument and articles and the settings of the tool relative to the product during the formation of the helical surface with feasibility core.

When a small drop diameters shaped diverticulum and a cylindrical core when forming screw the front surface of each point of the cutting tool forms a respective point of the profile of the helical surface. Therefore, the shape of the cutting tool can be calculated.

In large variations of the diameters of the core shaped diverticulum is feasibility. Therefore, when forming the screw surface is continuously changing installation settings grinding wheel diversion from the axis of the countersink. The same area of a circle when you want to obtain different sites helical surface. In this regard, the profile tool (milling cutter is lagueny the method is as follows: take the tool 1 with producing surface, belonging to the sphere 2 (Fig. 1). Product 3 and the tool 1 is reported rotation and the exercise of their relative movement. Due to the fact that the core product is the feasibility, the formation of the helical surface is continuously changing parameters setting tool 1 moved away from the axis of the product 3. The removal tool is implemented by its rotation around the center of the sphere OSF. The use of the tool with producing spherical surface has the following advantages.

1. The shape tool manufacturable, playing with the edit, the edit tool does not change the conditions of forming the helical surface on the product feasibility core as producing spherical surface remains the same, it just changes the diameter of the tool (shown in dashed lines).

2. To install the tool with producing spherical surface relative to the product is required to withstand only two installation option -zand m0(Fig.2), where m0- the shortest distance;z- the rotation axis Xandthe X-axis, provided that the axis of Xandmanufacturing sector is in the plane isDeleted solution of equations of the envelope of the family of spheres surface and the helical surface of the equation (1), enable us to calculate the coordinates X, Y, Z of the points of the cutting edge products with the feasibility core (considered as conical)

< / BR>
where

m0- the shortest distance between the axes Z and Zandmm;

z- the rotation angle of the coordinate system Xand, Yand, Zandaround the axis of the piece, glad;

RSFis the radius of the manufacturing sector, mm;

r0polar coordinate of the calculated point of the cutting edge, mm;

polar angle calculated point of the cutting edge, I am glad;

Z0the calculated coordinate point of the cutting edge Zandmm;

- half the angle at the vertex of the conical core details, glad;

p - helix

< / BR>
where

P - step helical surface, mm;

X, Y, Z - coordinates of the points of the cutting edge part, mm

The equation do not expect the entire surface, the envelope of the family of spheres as it moves along a helical line of the cone part, and only those points on the envelope, which contacts the cutting edge.

The method of processing spiral surfaces of constant pitch for products with feasibility core, wherein the product reported a helical movement, and the tool rotation with simultaneous instrument away from the axis of the product by rotation around the centre of the sphere, moreover, the calculation of the coordinates of the points of the cutting edge for screw front surface is calculated by the formula

< / BR>
where mabout- the shortest distance between the axes Z and Zandmm;

z- the rotation angle of the coordinate system Xand, Yand, Zandaround the axis of the piece, glad;

RSFis the radius of the manufacturing sector, mm;

raboutpolar coordinate of the calculated point of the cutting edge, mm;

polar angle calculated point of the cutting edge, rad.;

Zaboutthe calculated coordinate point of the cutting edge Zandmm;

the half angle at the vertex of the conical core parts, rad.;

p - screw option ( where P - step helical surface, mm);

X, Y, Z - coordinates of the points of the cutting edge details, mm.

 

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