Cope Part. |llne

mold Drag ]_

5 B

F I -! Fig. 2 Fig. 1 Fig. 1. Placing of the Washburn r i s e r in the mold: 1) r i s e r ; 2) Washburn r i s e r plate; 3) portion being filled. Fig. 2. C o r e box for production of e a s y - t o - r e m o v e r i s e r s . TABLE 1 Diam.ofthepor- tDiam, ofthe hole in ]Diam. oftheintion being filled D,[ the Washburnriser Dl,[sert D2, mm mnm I mm , I 60 90 120

16 32 48

32 48 64

r i s e r s the r e q u i r e d d i m e n s i o n s of the holes in the Washburn r i s e r plates in relation to the d i a m e t e r of the portion being filled w e r e established. To p r e p a r e the Washburn r i s e r s the i n s e r t s 2, the dimensions of which a r e given in T a b l e 1, w e r e placed in the c o r e box 1 (Fig. 2). Introduction of this method of producing pipefitting p a r t castings of 10KhlSN9TL s t e e l has lowered the l a b o r r e q u i r e m e n t f o r the r e m o v a l of the r i s e r s , reduced the a r e a of the portion of the r i s e r to be cut by two to t h r e e t i m e s , and has d e c r e a s e d the l o s s of liquid m e t a l .

IMPROVING HOUSING N.

PRODUCTION

OF

GATE-VALVE

CASTINGS M.

Krendelev

UDC 621.646.5.002.2

High r e q u i r e m e n t s f o r density of the m e t a l a r e specified for g a t e v a l v e s produced f r o m 10Kh18N9TL s t e e l and designed f o r operation in c o r r o s i v e media. After casting, the g a t e - v a l v e casing (ends for welding) a r e tested f o r defects with x r a y and f l u o r e s c e n t p e n e t r a n t s (transition a r e a s ) . P r e v i o u s l y at Aleksin Heavy Industrial Fitting Plant g a t e - v a l v e casings with nominal p a s s a g e d i a m e t e r s of 250-800 r a m (Fig. la) w e r e c a s t with f a l s e flanges on the ends of the main openings on which w e r e placed r i s e r s . A f t e r casting of the housings the flanges w e r e cut off. However, x - r a y inspection showed that t h e r e a r e many defects in such castings. To eliminate d e f e c t s , the housing casting production operation was changed (Fig. lb). The castings w e r e designed to e n s u r e that the principle of s u c c e s s i v e solidification was o b s e r v e d . This principle holds that an i n c r e a s e in the r a t e s of s u c c e s s i v e l a t e r a l hardening along the casting o c c u r s so that the points located on t h e a x i a l line of the casting n e a r the ends f o r welding harden e a r l i e r than the points located close to the feeding head above the packing r i n g s ; in other w o r d s , a t a p e r e d feed channel of liquid m e t a l , tending to m o v e in the direction toward the head, is f o r m e d . It should be noted that at the s a m e t i m e l a t e r a l hardening develops at points located close to the head. T h e r e f o r e , d e n s e casting depends upon whether the tip of the tapered channel r e a c h e s t h e s e points before s o l i dification is completed. In the l a t t e r c a s e d e l i v e r y of feed m e t a l stops and axial shrinkage porosity is f o r m e d . T r a n s l a t e d f r o m K h i m i c h e s k o e i Neftyanoe M a s h i n o s t r o e n i e , No. 6, pp. 32-33, June, 1979.

0009-2355/79/0506-0467507.50

01980 Plenum Publishing C o r p o r a t i o n

467

Points for risers

..

Poin.tsfor _ tiers

a)

b) Fig. 1. Gate valve casings cast u s i n g t h e old (a) and new (b) methods. The introduction of this casting method for g a t e - v a l v e housings has made it possible to i m p r o v e their quality significantly (in x - r a y inspection the number of defects did not exceed the allowable}, to i n c r e a s e the output of acceptable p a r t s , and to d e c r e a s e a s - c a s t weight and machining of the housing. The annual savings f r o m the introduction of this method into production is 20,000 r u b l e s .

SEMIGANTRY CAPACITY P.

Y.

CRANE

OF FIVE Zakrevskii

WITH A CARRYING TONS and

I.

F.

Yatsevskii

UDC 621.873.2

In the F a s t o v "Red October" Chemical Machine Building Plant a s e m i g a n t r y c r a n e with one cantilever with a c a r r y i n g capacity of 5 tons has been developed and manufactured. A short,flexible c r a n e support is t r a n s p o r t e d along an overhead t r a c k , whose railhead level is located at a height of 5.5 m. The rigid support is t r a n s p o r t e d along a ground t r a c k whose raflhead level coincides with the level of the platform. The c r a n e c a n t i l e v e r makes it possible for the telpher to be t r a n s p o r t e d on a highway. The c r a n e is s e r v i c e d by a depot platform placed along the walls of the shop. f r o m the ground.

The crane is controlled

The advantage of the s e m i g a n t r y c r a n e , as compared to a g a n t r y c r a n e , is that since it has no ground supports next to the building where the exits on the depot platform a r e , it can be used without hindrance and the entire s u r f a c e in the a r e a below the c r a n e can be used efficiently. Besides, the c r a n e is simple to manuf a c t u r e : The bridge is built f r o m pipes of a d i a m e t e r 426 x 8 m m , H - b e a m s , and s t r i p s ; and the supports a r e built of channels and plates. Technical

Characteristics

Carrying capacity, tons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Span of the c r a n e , m . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cantilever boom, m . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lifting height, m . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lifting r a t e , m / m i n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transport rate, m/min: bridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . telpher . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Weight of c r a n e , kg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 7.3 2.7 6 8 22 20 7850

Translated f r o m Khimicheskoe i Neftyanoe Mashinostroenie, No. 6, p. 33, June, 1979.

468

0009-Z355/79/0506- 0468 $07.50 9 1980 Plenum Publishing Corporation