SU1313557A1 - Method of producing commutators of electric machine - Google Patents

Description

one

The invention relates to powder metallurgy, in particular, to methods for producing collectors of electrical machines from copper-based powders, and can be used in electrical engineering, automotive industry, instrument engineering and other industries of national economy.

The purpose of the invention is to increase productivity and provide savings for non-ferrous metals in the manufacture of collectors, as well as improving the mechanical properties of products. Compared with the known method, the performance of the proposed method is improved by reducing the number of operations, reducing their labor intensity and automation capabilities. Economy of non-ferrous metals is achieved by reducing waste during final machining of collectors. The improvement of the mechanical properties of the collectors occurs due to an increase in the density of the product during installation.

Figures 1 and 2 depict an annular billet after pressing and sintering, in FIGS. 3 and 4 is the same after the extrusion operation in the matrix with a core rod; in FIG. 3, the same, after extruding the radial grooves on the flange, in FIG. 6 is a view along arrow A in FIG. 3; Fig.7 is a view along arrow B in Fig.Z; on Fig and 9, the workpiece after flaring the inner ends of the segments; figure 10 is the same, after plastic crimping.

The method is carried out as follows.

Example .. Production of a starter collector CT230-37013220.

PMS-1 powder (GOST 4960-73) was pressed into annular blanks with internal grooves parallel to the ring and the ledge on the inner surface from one and two sides with a height of ledges 0.5-1 of the tooth height of the segment- (3.3 mm) and a pressure of 3.3 t / cm. Pressing

133572.

(Fig. 1) was sintered in an endogas medium at 1020–10 ° C for 1.3 h, while in the temperature range of 360–400 0 the billet was held for 1 h. The finished billets were placed in a stamp and deformed by extrusion in the annular gap between the matrix and the core punch with the formation of a flange with a height of 7 mm with an outer

 About 60 mm diameter. With this degree

the deformation was 40-83%, and the thickness of the jumper between the segments was 0.3-1 mm (figure 2).

Flange annealed at 300-400 ° C

 - on the HDTV unit and squeezed out on it radial grooves coinciding with the grooves on the inner surface of the workpiece (Fig. 3), then the ends of the segments were flared (Fig. 4) and

 opressovyvali plastic AG-4s

(GOST 20437-73; Fig. 3), then the jumpers between the segments were removed, machined on a lathe.

Modes of obtaining the collector and its properties are presented in the table. For comparison, the table shows the production modes and properties of the collectors manufactured by a known method.

As follows from the above data, the collector obtained by the proposed method has a tensile strength of 294-382 MPa and a hardness of 108-147 HB, and the collector,

35 obtained by a known method - 189-237 MPa and 89-93 HB, respectively. When removing jumpers between segment-. mi after crimping plastic on the proposed method in the waste goes

 12.8-41.3 g of copper, and according to the known - 129.6-163 g.

For the manufacture of collectors of this type according to the proposed method, it is necessary 42.778 h per 1000 pcs., And

 according to the known - 176.986 hours per 1000pcs. Thus, the proposed method, in comparison with the known method, allows to increase productivity, reduce metal consumption and improve fur 25

thirty

50

nical properties of reservoirs.

cornfield npec with a MPa

90.3 7 90.0 7 91, Q 7

40 70 85

The known method Calibration in the 95.7 3.4 237.0

95

129.62

89

1–5.09

FIG. g

,five

/eleven

15

 chg

F.63

,five

FZh5

6

0.5

Ф46.5

4S

F63

5

the form

.five

FIG. 7

FBZ

Fig 8

,five

FIG. 9

,five

Remove me / lag l

(rig.Y.

Editor A. Ogar

Compiled by V.Solrpov

Tehred M. Khodanich - Proofreader S. Shekmar

Order 2160/10 Circulation 741 Subscription

VNIIPI USSR State Committee for Inventions and Discoveries 4/5, Moscow, Zh-35, Raushsk nab. 113035

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

METHOD FOR MANUFACTURING COLLECTORS OF ELECTRIC MACHINES, including pressing powder of a copper-based annular blank with internal grooves parallel to the forming of the annular blank, sintering, manufacturing on the flange of radial grooves coinciding with the internal grooves of the annular blank, flaring of the inner ends of the grooves removal of metal jumpers between segments, characterized in that, in order to increase productivity. mechanical properties of products and non-ferrous metal economy, pressing is carried out with a step on the inner surface on one or two sides, after sintering, extrusion of the workpiece is additionally carried out in a matrix with a profile rod with an annular gap between them of 0.3-1 mm with a degree of deformation 4085% with the formation of a flange, annealed at 300-400 C, and the radial grooves on the flange are made by extrusion. SU „„ 1313557 Figure 1