SU599904A1 - Method of manufacturing components with deep narrow blind cavities - Google Patents

Description

one

The invention relates to the processing of metals by pressure and can be used in the manufacture of parts with deep, narrow, blind and hollow stones.

A known method of manufacturing parts with deep, narrow, hollow cavities, containing oieracine shaping a cavity by deaf piercing, as well as the design of the outer surface of the part 1.

The disadvantage of the known method is that, when the cavity is manufactured by successive insertions of the firmware, the latter works in extremely severe engineering and thermal conditions, since it is not always possible to create effective cooling, moreover, the greater the depth of the floor and what it should already be the more likely the deviation of the firmware from the axis of the firmware, resulting in a poor product quality from the point of view of manufacturing accuracy.

The aim of the invention is to increase tool life and manufacturing accuracy.

This is achieved due to the fact that at first a pre-shaping of the outer surface of the part is carried out, with a hollow firmware in the workpiece, a cavity is made with a diameter and depth larger than the diameter and depth of the finished product, and then the production of the workpiece is reduced to the end.

the sides of the cavity to obtain its diameter and depth equal to the diameter and depth of the cavity of the finished product, while at the same time making up the outer surface.

FIG. 1 shows the initial moment of the process; on fng. 2 - the final moment.

The workpiece I is laid in the die 2, stitched with the force P by the punch 3 with the pierce 4, and the workpiece is backed up by the bottom of the ejector 5.

As a result, the blank 6 is pre-stitched. The relatively large width of the preliminary cavity allows for an efficient design and durability of the preliminary piercing punch.

Preliminary billet 6 is placed in the die 2, and the correction 7 of the final punch 8 is inserted into its cavity, which

located in the pre-cavity with a gap over the entire surface. Due to the increased dimensions of the cavity, the height of the pre-workpiece 6 is larger than that of the finished part 9, therefore, the workpiece is deformed by

its sediments in the butt between the end of the punch 8

and the bottom of the ejector 5. Iri this flow

metal billet and directed radially to

the center, i.e., to the piercing-mandrel 7 and under it.

Due to this, piercer-mandrel 7 practically during the whole time of the punch is not in contact with the metal of the workpiece and comes into contact only at the very end of the working stroke. Therefore, element 7 plays a role not on stitching, but onravki. The scheme of its mechanical immersion is favorable - mainly radial biaxial compression. Its heating is due only to the radiation component of the Yush (in no heat transfer), and this provides it with good thermal conditions. Before radiation heating is applied, it is not necessary to fill up the billet of workpiece 6 before inserting the firmware 7 in it into a certain amount of thermal insulation material 10 in the form of powder, for example, flake graphite, refractory clay, boron nitride, etc.

At the moment of the punch, a teplpzol cyopic material with a solid and sufficiently thick layer is placed in the gap between the workpiece 6 and pierced-mandrel 7 and shields the latter from thermal radiation, and subsequently from direct contact.

An example of a drying process.

With the stamping of a mandrel of a bore mill with an outer diameter of 77 mm and a length of 205 mm, having the shape of FIG. 2, it is necessary to obtain a deaf cavity (conical) with a diameter at the base of 062, at the top of 0 10 with a depth of 176 mm.

This part is molded from a solid cylindrical billet of 075 mm and a length of 108 mm.

At first, the heated billet is “crushed (pressed) in the matrix with the formation of a nose at the blind end.

Then, the billet is stitched with a preliminary stitching with the formation of a con fi nal cavity with a diameter at the base of 063, at the top of 0 15 and a depth of 181 mm.

After that, 30-50 g of flake graphite are poured into the bottom of the intermediate billet, the final piercing mandrel is pushed into the cavity until the punch stops at the end of the bung, and the end of the punch is applied to the end of the billet, crimping the last from all sides around the tailoring, selecting The gap between the pin and the cavity and the image is final both of the cavity and of the pair of the product.

The proposed method allows to significantly increase tool life and precision in the manufacture of parts.

Claims (1)

1. Forging and die forging. Ed. L. V. Storozheva, “Mechanical Engineering, Vol. 2, 1968, p. 42 I.i iO- -