SU1205998A1 - Arrangement for taper compacting of flat powder blanks - Google Patents

Description

The invention relates to powder metallurgy, in particular, to devices, which have the following properties: for sealing flat sintered billets with transverse dynamic hot pressing.

The purpose of the invention is to increase labor productivity and product quality.

FIG. 1 shows the proposed device, a general view; in Fig.2, section A-A in Fig.1; in fig. 3 - constructive execution of the forming tool; in fig. 4 - the main geometrical parameters of the punch.

The device consists of a forming tool 1, sliding plates 2 and 3, made in the form of sliders, and a matrix 4. The forming tool is a composite structure consisting of a guide rod 3 stops 6 fixed on the gear with screws 7 and interchangeable wedge-shaped punches 8, which are fastened to the guide rod with screws 7 and 9. The matrix 4 is made of a composite of two semi-matrix 10 and two inserts 11 installed in the housing 12. In order to manufacture flat products of various thickness, the measuring plates 13 are mounted, which are fixed in n- Tammy 14 to the inserts 11. Thrust plates 2 and 3 are set to prevent the axial flow of material sealed proxy blanks.

The device works as follows.

With the open cavities of the matrix 4 (the slides 3 are moved apart, and the sliders 2 are shifted to the axis of the matrix) heated porous billets 15 are placed into it.

Then the cavities are closed.

matrix, moving the sliders 3 to the center of the matrix. When wedge-shaped punches enter the die cavity, their intake part seals the blanks 15 in the transverse direction. The forming tool 1 provides for the sequential compaction of small volumes of powder material of the workpieces in the presence of friction forces on the contact surfaces, transverse sealing stresses, as well as shear axial forces. The presence of the latter contributes to an increase in the quality of high-density flat products due to the uniform distribution of the powder material. After the extrusion is completed (additional sealing), the forming tool 1 is removed from the cavity of the matrix 4, the slides 5 are moved apart and the blanks are removed.

The residual porosity of the blanks does not exceed 1.5%, the unevenness of the density distribution But it does not exceed 2.5%.

The proposed design of the forming tool permits the production of a press slide at the same time by two and more highly dense powder products, which significantly increases the productivity of the device. The use of symmetrically located punches on the guide rod ensures that the forming tool does not skew when the sintered porous blanks are laterally hot-sealed. As a consequence, the friction loss between the rod and the die is reduced, which contributes to a reduction in energy consumption during pressing.

Y4M.

W

2

2 (raka)

Fkg

Compiled by L.Gamayunova Editor N. Bobkova Tehred Z.Kastelevich Proofreader M.Maksimishinets

Order 8601/11 Circulation Subscription

VNIIPI USSR State Committee

for inventions and discoveries .113035, Moscow,, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, Proektna St., 4

Claims (1)

DEVICE FOR WEDGE PRESSING OF PLANE POWDER PREPARATIONS, mainly for transverse dynamic pressing, including a die, thrust plates and a forming tool, characterized in that, in order to increase labor productivity and product quality, the matrix is made with a guide hole, and the forming tool - in in the form of a rod and wedge-shaped punches symmetrically fixed on the axis and installed with the possibility of movement along the matrix hole.