SU761109A1 - Method of stamping flanged parts - Google Patents

Description

The invention relates to the processing of metals by pressure, and in particular to methods of sequential volumetric stamping of parts with a flange.

A known method of stamping parts with 5 flange from a rod with the design of the flange and a preliminary set of metal under the boss when flattening the bar, preliminary and final forming of the boss and cutting the details [1]. YU

However, this method does not provide a wide range of products due to the insufficient height of the boss when stamping flange nuts.

The aim of the invention is the expansion of the 15 nomenclature of manufactured products by increasing the height of the boss when stamping flange nuts.

This goal is achieved by the fact that during preforming the lugs in it break the hole with a diameter smaller than the final one, and during the final molding they produce a drill with the specification of the lug wall.

FIG. 1 is a diagram of the stamping 25 ki, side view; in fig. 2 - the same, top view.

The stamping of the proposed method is as follows.

The bar is served in the working area of the stamp 30

2

consistent action until it stops. When moving the press ram down a bar with a diameter of Ώ is accelerated by a die, forming a nut flange to a predetermined thickness 5 and pre-picking up a metal under the boss (threaded portion) with a height H, which is less than the diameter specified for the hole with a bore for the thread diameter άι (position I).

Considering that thinning of the wall of the threaded part in one operation is possible in

1.5-2.5 times, you can withdraw:

2 & '_ & - & ι

’2 - 2

from where

(one)

where ά _α is the diameter of the hole for the thread;

ά - outer diameter of the threaded part of the nut.

Height / g is determined from the condition of equality of the volumes of the threaded part in the second and third positions.

=

from where

$ 76110

After substituting formula (1) into formula (2) and simple transformations, we get:

__ Λ) (, ά + άρ)

- 4ά „

(3)

where But is the height of the threaded part of the nut.

After that, the bar moves one step. At the next course of the press (position II), by punching, a hole for a thread with a diameter of άι, determined from relation (1), is pre-formed.

At the subsequent filing of the rod per step (position III), a hole for the thread to the specified diameter yo is finalized by thinning the wall of the threaded part of the previously punched hole with a diameter of άι. The height of the threaded portion is increased to a predetermined size H _o .

Next, the resulting part is cut down (position I).

Example. In laboratory conditions, an approbation of the method of stamping flange nuts No. 5 from a wire with a diameter of 6.5 mm of grade Art. 10. Stamping was carried out on the stamp of a sequential action.

The wire was manually fed into the stamp to a temporary stop, after which the matrix was dispersed by moving the press ram down. The matrix accelerated the wire to form a flange of the nut to a predetermined thickness of 1.2 mm and preliminarily typing metal under the threaded part 3.3 mm high with a bore hole

2.1 mm.

The height H was determined from the relation (3)

K _ _M £ ± _4) _ _ 5.5 (6.3 + _4 _, _ 2 _) _ _ _{3 3 mm} 4th? ₀ 4 · 4.2

The diameter _{f was} determined by the formula (1) d _g - 2.y _d - d ~ 2-4.2-6.3 = 2.1 mm,

where lo = 5.5 mm; b? o = 4.2 mm;

with £ = 6.3 mm, the parameters of the part given by the construction figure. After that the wire was moved one step. At the next press run, a hole with a diameter of 2.1 mm was punched. Then, after moving to the pitch, the hole diameter is 4.2 mm due to wall thinning of the threaded part, while the height of the threaded part increases to a predetermined height of 5.5 mm.

Then the resulting item is cut down. The manufactured part meets the technical requirements for flange nuts.

The proposed method provides for obtaining parts with a flange of various nomenclature by increasing the height of the bulls.

Claims (1)

Claim The method of stamping parts with a flange of 25 bars with a flange design and a preliminary set of metal · under the boss when flattening the bar, preliminary and final molding of the boss and cutting the part, characterized in that 30, in order to expand the range of manufactured products by increasing the height of the boss during stamping flange nuts, when preforming the lugs in it, punch a hole with a diameter of 35 meters smaller than the final one, and at the final molding, razbortovka with thinning of the wall of the lug.