SU1357111A2 - Arrangement for stamping parts - Google Patents

Abstract

This invention relates to the field of metal forming. The aim of the invention is the expansion of technological capabilities by adjusting the speed of movement of the die during stamping. The device contains a movable in the axial direction of the con. a teyner with radial rods in the lower part and a stepped inner surface forming a cavity under a high pressure liquid. A punch associated with the plunger is placed in a cavity of a smaller diameter container connected to a cavity of a larger diameter container. The support for the workpiece is rigidly connected to the ejector, and its surface forms an annular cavity with the container wall and guiding plunger. In the cavity there is an adjusting sleeve, made with longitudinal grooves, in which rods are installed, ensuring its axial movement. When extruding, the rods move along the grooves of the sleeve, engage it and move up, changing the area of the annular cavity and thereby adjusting the speed of movement of the container. As a result, the power characteristics of the pressing process are reduced, which ensures a reduction in the material consumption and power consumption of the equipment used. 1 il. Ooh ate v |

Description

one . 13

The invention relates to the field of metal forming and is an improvement of the device according to the author. St. No. 1082537.

The purpose of the invention is the expansion of technological capabilities by adjusting the speed of movement of the die during the stamping process.

The drawing shows the device (to the left of the axis is the initial state, to the right, during the mounting process).

The device contains a container 1, a guide plunger 2, a support 3 for the workpiece to be processed, a tiller 4. The container 1 is made in the lower part with a large bottom cavity, meter, and is installed along it on the guide plunger 2 to form an annular cavity 5, which is connected by channels 6 with cavity 7 of the container. The working fluid is poured into the container, which freely passes through the channels 6 into the cavity 5. The step punch 8 is connected with the plunger 9. The sleeve H, made with longitudinal recesses 11, is installed on the guide plunger 2 with the possibility of movement in the axial direction. Radial rods 12 located in the lower part of container 1 are installed with internal ends in longitudinal recesses 11 of sleeve 10. Preparation 13 is made with collar 14, which, when installed in the internal channel of the container, rests on a step in channel 6.

The device works in the following way.

When a load is applied to the step punch 8, it is inserted into the workpiece 13. At the same time, the plunger 9 displaces the liquid from the cavity 7 of a smaller container diameter through the channels 6 into the annular cavity 5..

Since the volume of liquid in the cavity of a smaller diameter of the container decreases as the first stage of the punch 8 is inserted into the workpiece 13, the liquid flowing into the cavity 5 moves the container 1 upwards. The latter, due to the engagement with the workpiece blank, stretches the deformable material, resulting in a reduction in the specific pressing force on the punch 8.

During the extrusion of the cavity of the second stage, which has a larger diameter compared with the first stage, the flow rate of the deformable metal

in the axial direction along the container wall increases, and in order to ensure the engagement of the billet of the workpiece with the container moving in the axial direction upwards, it is necessary to increase the speed of movement of the container, which is done by reducing the cross section area of the annular cavity in the direction of the plunger, it starts from the moment of the beginning of the mounting of the cavity of the second stage due to the engagement of the radial rods of the container, which are located in the longitudinal recesses of the sleeve.

The dimensions of the sleeve are selected from the following considerations. The speeds of movement of the container during the formation of cavities of two stages are from the equations of instantaneous flow rates, which for the formation of the first cavity have the form

n S VM-SM V, 3 „; Sj SJ, V,

where v is the speed of the punch (plunger) y, v is the speed of movement of the container;

vT - metal flow rate during first extrusion

Cavities}

S is the cross-sectional area of the plunger} S ,. - cross-sectional area

the first step of the punch; S is the annular area of the displaced metal from the first cavity j

Sjj - the area of the lower chamber of the container.

The condition of the constant engagement of the billet billet

.

Solving a system of equations obtained with respect to the area 5 „,

Vn-S + v, -S, Si-v

Vn- S,

M

yl vl

M k

we get

SM (g + 1).

313571

Vafazha area through radii, we get

  (R, -RVCH -), 5

where RH is the radius of the lower chamber; R is the radius of the product; i R J is the radius of the first stage;

R is the plunger radius. Similar equations are made to inflate the second cavity.

Vn-S + (,);

vn s;

, 0.5 (6)

/ and "

where V - is the flow rate of the metal when the second is pressed

cavities;

S is the area of the displaced metal during the extrusion of the second cavity; V - - container speed at

Inserting the second cavity S | - adjustment area

rings.

Using the condition v - v, we solve the system of equations for S.

Area expressions through radii and substitutions

S. (R ;, - RL).

fc / f. u

where the inner radius of the sleeve, Cc is the outer radius of the sleeve, equal to the radius of the lower chamber, we find

ai

(1 |) (R ;; - R ;.),

four

radius of the second stage of the punch.

Thus, the size of the sleeve is equal to

K „V (Rj, -Rp (HRVRp,

0

five

five

0

So, for example, for the following

) K-R) if

A hook, for example, for trace data: R 80 mm, mm, mm, mm, we find R 116.2 mm; Rgj, 800 mm.

The application of the invention provides a reduction in the power characteristics of the process of extrusion, which reduces the consumption of materials and energy consumption of the equipment.

Claims (1)

Invention Formula Device for stamping parts according to ed. St. No. 1082537, characterized in that, in order to expand technological capabilities by adjusting the speed of movement of the die during the stamping process, it is provided with a sleeve installed with limited axial movement between the outer surface of the guide plunger and the inner surface of the cavity of the larger diameter container and radial walls mounted outer ends in the zone of the lower end of the container, while on the outer surface of the sleeve there are longitudinal recesses under the inner the ends of the radial rods.