The method of manufacturing a non-circular shape

 

(57) Abstract:

Summary of the invention according to the method of manufacturing a non-circular shape having at least one surface parallel to their axis, they produce molding with at least one inclined surface component with the axis product an acute angle. The projection of the contour of the smallest cross-section of this surface onto a plane perpendicular to the axis of the product is inside the contour of the cutting path obecniho tool. A trim scrap is produced sequentially in two steps: first, the pressure at the above-mentioned inclined surface of the cutting edge product turn so that said projection is parallel to the contour of the cutting edge, and the second - produce cutting excess material. The use of the invention is an improved surface quality of products and increase the resistance of the trim tool. 2 Il.

The invention relates primarily to the field of manufacturing technologies core products with versatile heads, for example, a terminal and cage bolts, landing on the machines.

In the manufacture of core products with multi-faceted heads has come of ADCI head on a trim her fin as that the cutting edges of the trim tool embedded in the faces of the formed polyhedron head (which is unacceptable) because of the rotation of the workpiece around its own axis (if pulling and pushing in landing positions, as well as in carrying legs).

There is a method of manufacturing a non-circular shape having at least one surface parallel to their axis, including molding and trim excess material products cutting edge of the trim tool.

The disadvantages of this method consist in the increased load on strippers and poor surface quality due to the digging and burrs on it because of the great height of the Burr, is equal to the height of the cylindrical part of the head at the beginning of the cutting process.

The purpose of the invention, the implementation of the orientation of the workpieces products non-circular shape when transferring them from the operation of forming on a trim excess material (scrap) at small angles of rotation of the workpiece about its own axis arising from this transfer.

The aim is achieved by a process of manufacturing a non-circular shape, including molding and trim excess material products cutting edge cutting tools what about the at least one inclined surface, component with the axis product an acute angle whose value on the contour of this surface may change somewhat, with the projection of the contour of the smallest cross-section of this surface onto a plane perpendicular to the axis of the product is inside the contour of the cutting edge, and a trim produced sequentially in two stages the first of which the pressure on said inclined surface of the cutting edge product turn so that the said projection path of least cross-section is parallel to the contour of the cutting edge, and the second - produce cutting excess material.

In Fig. 1 shows a scrap scrap pre-planted head terminal screws, the initial moment; Fig.2 is the same, the final moment. Landing heads made with obtaining inclined faces F and G.

Z-Z the horizontal projection of the vertical plane of symmetry of the head,

P-P the contour of the cutting edges of the trim tool,

a-a horizontal axis of symmetry of the cutting edges

about cutting the amount of Burr,

the angle of rotation of the head around its own axis during the cutting operation of the Burr,

PoP point of contact of the cropped head with cutting R>
The pressure of the cutting edges p-p on preformed face ABEF and CDHG (Fig.1) create a torque applied to the head, due to the fact that the horizontal axis of symmetry of the head Z-Z before cutting it cutting edges offset from the horizontal axis of symmetry of the cutting edges and the angle g. Under the action of this torque is the turning of the bolt head on the corner of g, resulting in the axis of the head and becomes parallel cutting edges p-p, then start trimming of excess material in the volume of the overflow Of Fig.2 presents the final trimming head terminal screws.

Thanks to this solution of the technical problem orientation of the cropping of the head is achieved by parallel side faces cropped heads product with the side surfaces neobitaemoe part of the product.

To improve the surface quality of the product contributes to the uniformity of cutting excess material trimmed volume of product in his path is provided by the mentioned rotation of the product at the desired angle to parallelism with the cutting edges of its side path before trimming excess material.

Thanks to the uniform application Oceanie of the invention is an improved surface quality of the product and increase the resistance of the trim tool.

The method of manufacturing a non-circular shape having at least one surface parallel to their axis, including molding and trim excess material products on the cutting edge of the cutting tool, characterized in that the moulding is produced with at least one inclined surface component with the axis product an acute angle whose value on the contour of this surface may change somewhat, with the projection of the contour of the smallest cross-section of this surface onto a plane perpendicular to the axis of the product is inside the contour of the cutting edge, and a trim produced sequentially in two stages the first of which the pressure on said inclined surface of the cutting edge product turn so that the said projection path of least cross-section is parallel to the contour of the cutting edge, and the second to perform surgery cutting excess material.

 

Same patents:

The invention relates to the production of core products with head

FIELD: plastic working of metals, possibly manufacture of rod like fastening articles with heads having curvilinear supporting surface, such as clamp bolts for joining rails of railway road.

SUBSTANCE: cutting off operation is realized by means of tool having die, punch and knocking out member. Rod portion of blank of rod article is placed in hole of die having recess. At initial stage of cutting off operation by action of punch upon end face of head the last is embedded into cut-off die. Then simultaneously punch and cutting edges of die are cut into body of head at clamping cut-off metal between end surfaces of punch and die. Said cut-off metal is separated from head by pushing rod article through opening of punch. Cutting edges of die are cut into bode of head by depth consisting of 0.65 - 0.80 of height of article head while preventing contact of faces of head part placed between cutting edges of die with die surface. Distance between cutting edges of die providing cutting-off of mutually opposite faces of head consists of 0.95 - 0.99 of similar distance between cutting edges of punch. Height of die recess consists of 0.65 - 0.80 of head height.

EFFECT: improved quality of articles, enhanced strength of tool.

2 cl, 4 dwg

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