A method of making holes in the elongated parts

 

The invention relates to the field of metal forming and can be used, for example, in the manufacture of barrels of weapons and gunpowder Assembly tools. In detail, elongated in shape, make holes with a sharp increase in diameter or blind holes. On the workpiece with prior longitudinal hole formed tapered sections at locations corresponding sharp increase in the diameter of the hole or the bottom of a blind hole. To do this, change the outer diameter of the workpiece and the inner diameter of the hole. Then the workpiece mounted on the frame and produce a comprehensive pulsating lateral compression using hammers. Conic sections can be performed with a tilt angle to the longitudinal axis of the hole of the workpiece, comprising from 10 to 20o. Conic sections can be formed by reducing the outer diameter of the workpiece in a location corresponding to the smaller diameter of the hole or its absence, in the case of a blind hole, and increasing the inner diameter of the hole of the workpiece in place, following the increase in the diameter of the hole or the bottom of a blind hole. The result is the expansion of technological capabilities of the method. 3 Lisovets, for example, in the manufacture of barrels of weapons and gunpowder Assembly tools.

A known method of making holes by drilling (see Trinity N. D. Deep drilling. - L.: engineering, 1971, S. 142 and 143, Fig. 81, RF patent 2176176, class 23 In 35/00, 51/00, publ. 27.11.01, BI 33).

There is a method allows to obtain a cylindrical hole of a given diameter, however, with increasing depth of the hole occurs tapered and reduced the percentage of yield of products.

Another disadvantage of this method is the low quality of the surface of the hole, namely a high degree of roughness.

The closest in technical essence of the prototype is a method of making holes in a stretched form, namely, that set the workpiece with the longitudinal bore of the mandrel and implement a comprehensive side pulse compression using Molotov (see Forging and stamping on specialized equipment /B. P. Rudakov, A. N. Ilichev, E. C. Stepanov and others /edited Ed. P. C. Kamneva and A. P. Atroshenko. - 3rd ed., revised and enlarged extra - Leningrad: Mashinostroenie, Leningrad branch, 1982, pp. 22-36).

There is a method allows to get the details with the inner surface VII texture and hardening of metal provide high performance products while ensuring high performance and efficiency in the production of great length.

The disadvantage of this method is the inability to obtain parts with holes abrupt change in diameter, in particular blind holes with a flat bottom, so as squeezing compressing the metal to wrap around the corners of the profile of the mandrel without providing contact current metal with the surface of the mandrel, forming a cavity. As a result, the hole parts on a transitional site in a place that follows a sharp increase in the diameter of the mandrel has a diameter greater than the diameter of the mandrel in this section. This disadvantage reduces the scope of application of the known method.

The objective of the invention is to improve the application by providing the possibility of obtaining parts with holes abrupt change in diameter, including blind holes with a flat bottom.

The technical result is the elimination of lack of fit of the inner surface of the mandrel in places increase diameter hole parts during compression of the workpiece.

To solve the problem in a known method of making holes in a stretched form, including the installation of a billet with the longitudinal bore of the mandrel and comprehensive pulsating lateral compression salehie holes, before installing the blanks with the longitudinal bore of the mandrel in the places of the workpiece, corresponding to a sharp increase in the diameter of the hole or the bottom of a blind hole, form a cone plots by changing an external workpiece diameter and the inner diameter of the hole.

In addition, form a conical sections with an angle of 10 to 20oto the longitudinal axis of the hole of the workpiece - shape cone areas by reducing the outer diameter of the workpiece in a location corresponding to the smaller diameter of the hole or its absence, in the case of a blind hole, and increasing the inner diameter of the hole in place, following the increase in the diameter of the hole or the bottom of a blind hole, reducing the outer diameter of the workpiece in a location corresponding to the smaller diameter of the hole of the workpiece or its absence in the case of a blind hole is carried out until the diameter of the compression of the workpiece.

The invention is illustrated with drawings, where Fig.1 shows a drawing of the workpiece with the generated plots in locations corresponding to the change of the diameter of the through hole mounted on the mandrel of Fig.2 - billet with a blind hole.

A method of making holes in parts of the extended f the third side pulsating compression with Molotov 4. When you do this before installing the workpiece 1 is formed with a tapered sections 5, 6 on the workpiece 1 in 7 places, corresponding to a sharp increase in the diameter of the hole or the bottom 8 (Fig. 2) blind hole by changing an external workpiece diameter and the inner diameter of its holes. The tapered sections 5 form an angle of from 10 to 20oto the longitudinal axis of the hole 2 of the workpiece 1 by reducing the outer diameter of the workpiece in place 9 corresponding to the smaller diameter of the hole or its absence, in the case of a blind hole, and increasing the inner diameter of the holes in the seat 10, the corresponding large-diameter holes or deaf hole. This increases the diameter of the holes in place, following the change in the diameter or the beginning of a blind hole, in the direction of metal flow (indicated by arrows).

Reducing the outer diameter of the workpiece at site 9 is carried out until the diameter of the compression of the workpiece.

Side comprehensive (radial) compression of the workpiece is performed using Molotov 4 on the machine by mechanical means. When this hammer 4 has an angle of approach within 10 to 20o.

Imaginary 11 perpendicular to the plane of call of the hammer 4 is built from the start point ment, which determines the location of the beginning of the compression.

Example. In the manufacture of powder barrel Assembly gun you need to get a cylindrical part with a blind hole having a flat bottom and a smooth surface of high quality.

To obtain the required details in a cylindrical workpiece, in which a pre-made blind hole with a diameter equal to the diameter of the mandrel, which, in turn, corresponds to the diameter of the holes of the future of the barrel, by means of mechanical processing increase the diameter of the hole of the workpiece at site 10 (Fig.2). In this form the tapered section 7 of transition from the smaller diameter to the larger diameter hole of the workpiece with an angle of inclination corresponding to the angle of approach of the hammer 4, i.e. in the range from 10 to 20oto the longitudinal axis of the hole 2 of the workpiece 1. Increasing the diameter of the hole 2, form the technological gap between the mandrel and the walls of the hole.

Then by imaginary build 11 perpendicular to the plane of call of the hammer 4 find the point of intersection with the center line of surface 12 of the required details, which form the tapered section 6 of the transition from the larger diameter of the workpiece to less at the same angle equal to the angle of approach of the hammer.

and using Molotov 4. When this compression is carried out until the diameter of the compression details i.e. to line surface 12.

In the process of compression provides more uniform metal flow along the surface of the mandrel, which prevents the formation of cavities in places of abrupt changes in diameter of the mandrel or in place of the flat bottom of a blind hole.

Thus, the proposed method provides a wider scope of its application compared to the prototype due to the possibility of receiving holes from the abrupt change in the diameter of the hole, including blind holes with a flat bottom, which achieves a more uniform fit the inner surface obitaemoj details to the surface of the mandrel in changes in its diameter.

Claims

1. A method of making holes in a stretched form, including the installation of a billet with the longitudinal bore of the mandrel and comprehensive pulsating lateral compression of the workpiece using hammers, characterized in that made the holes with a sharp increase in diameter or blind holes, and before installing the blanks with the longitudinal bore of the mandrel in the places of the workpiece, corresponding to a sharp increase in the diameter of the CTE the morning of the diameter of the hole.

2. The method according to p. 1, characterized in that the tapered sections is formed with an angle to the longitudinal axis of the hole of the workpiece, comprising from 10 to 20o.

3. The method according to any of paragraphs. 1 and 2, characterized in that the tapered sections formed by reducing the outer diameter of the workpiece with longitudinal hole in the location corresponding to the smaller diameter of the hole or its absence, in the case of a blind hole, and increasing the inner diameter of the hole of the workpiece in place, following the increase in the diameter of the hole or the bottom of a blind hole.

4. The method according to p. 3, characterized in that the reduction of the outer diameter of the workpiece with longitudinal hole in the location corresponding to the smaller diameter of the hole or its absence, in the case of a blind hole, is carried out until the diameter of the workpiece after compression.

 

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SUBSTANCE: apparatus includes supporting plate and housing with openings and duct. Punch, upper and lower stops are mounted in housing. Said stops may be in contact with blank by their flat notched surface. Movable lower stop is arranged in openings of housing and on supporting plate; it engages with said plate by its smooth surface. Hydraulic cylinder joined by its rod with lower stop is mounted on supporting plate. Upper stop is in the form of cylinder mounted in housing in such a way that it restricts together with punch inner cylindrical cavity of hydraulic system providing motion of lower stop. Said hydraulic system also includes duct of housing and hydraulic cylinder.

EFFECT: enlarged manufacturing possibilities of apparatus due to increased range of changing relation of shear deformation to compression deformation of blank.

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