SU129138A1 - The method of making tubes - Google Patents

Description

This invention relates to tube manufacturing methods, nair.m-op. type of piston fingers, extrusion using solid process lubricants, including the operation of making the original billet in the form of a sleeve, and is aimed at improving the number of elements of the extrusion extrusion, the positive features of which are:

a) the introduction of solid particles, the role of lubricant when expired) metal P1, by means of specially designed recesses, the location and shape of which ensure the gradual pulling of lubricant embedded in the recess onto the surface of the friction by the metal itself;

b) the npouuiBHoro eggamia design with a hole to remove an otter, the diameter of which is smaller than the diameter of the piercing, which causes the extrusion of the otter, due to which there is a high pressure on the metal with a large reverse extrusion of the metal during the piercing:

c) making a stamp for extruding two workpieces deeply and with a groove in the lower part, which makes it possible to carry out the process with a continuous supply of workpieces one after the other.

FIG. Figure 1 shows a piercing stamp for making the initial billet in the form of a sleeve: on (eig. 2 stamp for extrusion.

The operation of making the initial billet in the form of is carried out using a piercing die, in which

No. 129138-2, the metal flow directions and the diameter of the hole / for removal of the otter during piercing is 2 smaller than the diameter of piercing 3.

Ptai billet lubricant is placed in the recess 4 saroTdBknjS podsuschayaschaya in the extrusion process in the matrix 6. Upper binder 7 serves as a cushion for the needle holder 8 when extruding the bottom: zagotyvki 5. When the edge 9 of the needle holder 8 begins to press on the upper end of the 10 blanks 7. that is the result a recess 4 is formed on it, which serves to insert the lubricant used in the extrusion of the subsequent billet, and also reduces the inner diameter to the diameter of the needle.

The process of lubrication during extrusion proceeds as follows, (the lubricant embedded in the recess 4 simultaneously enters the upper part 12 of the workpiece 5, and this part 12 corresponds to the depression 13 of the needle holders 8. Due to the difference in the diameters D and Di of the matrix, the lubricant containing the recess 4 gradually rises along the periphery of the workpiece 7 as it descends. The pressure created on the upper part of the end 10 of the workpiece 7 also contributes to squeezing the lubricant into the annular cavity between the needle 11 and the inner surface of the workpiece 7. Thus, the workpiece is lubricated from the outside and inside.

The length of the well of matrix 6 allows laying two blanks in it simultaneously.

When a punch is opened (removing the needle) to feed the next billet, the bottom billet is held by dimpling a matrin 1 6 with a diameter D.

P r with d m with m (1 3 about b e te e and n

1. Method of manufacturing tubes, for example, the type of piston fingers, by extrusion using solid process lubricants, including the operation of making the original billet in the form of a sleeve, o t-. characterized by the fact that, in order to supply lubricant directly to the rubbing surfaces during the expiration of the metal, recesses of various shapes are stamped on the workpieces, into which lubricant is then inserted.

2. Method 1 and 2, so that, for the purpose of expediently guiding the flow of the metal during the manufacture of the original billet by piercing, the diameter of the hole to remove the otter in the solid stamp is taken less than the diameter of the pierced.

3. Method but paragraphs 1 and 2, from the point of view of the fact that, for the purpose of continuous development of the process, the extrusion matrix is made with the possibility of placing two blanks into it at the same time and is provided with a groove holding the bottom blank when the stamp is opened (needle removal) to feed the next billet.