CN85200419U - Household multifunctional body-building amusement instrument - Google Patents

Abstract

The utility model discloses an integral type centrifugal pump casing with plastic inner lining and the corresponding compression moulding tool as well as compression moulding process which relate to the non-positive-displacement pump casing. The pump body has a large chamber and a small opening. The plastic inner lining can adopt fluoroplastics which is strong acid corrosion resistant. The moulding tool utilizes the original pump casing as the external mould. The mould core can be made into decomposing blocks which can be assembled into an integral. The decomposing blocks can be conveniently loaded into the pump casing and assembled into an integral internal mould. After compression moulding and decomposition, the moulding tool is taken out, adopting compression moulding process or transfer moulding process. The pump is anti-deep-etching and has a low coefficient of friction on medium. The efficiency of the pump reaches up to 66%. The pump has a low cost, and can replace acid-resisting pumps which are made of stainless steel and titanium alloy.

Description

Monoblock type centrifugal pump casing and its compression tool with plastic inner lining

The utility model relates to non-positive-displacement pump cases, relate more particularly to centrifugal pump casing.

Pump is industrial widely applied machinery, is widely used in the industries such as chemical industry, metallurgy, chemical fertilizer, pesticide, petrochemical industry, and centrifugal pump usage amount is more huge, and the output value of centrifugal pump ranks first in pump class product.In these industries, many centrifugal pump contact corrosion liquid solve the problem of that the corrosion-resistant of centrifugal pump is vast to be related to great economic benefit using factory, pump manufacturer and research unit's institute's questions of common interest and one.There are many method of the existing corrosion resistance for improving pump, example manufactures pump using corrosion resistant metals such as titanium alloy, stainless steels, though the corrosion resistance of pump increases, and it is expensive, especially stainless steel to the very strong liquid of certain corrosivity, such as dilute hydrochloric acid corrosion stability with regard to very poor.It is that pump is manufactured using corrosion resistant engineering plastics there are also a kind of solution, although this plastic pump has the ability of stronger antiacid alkali, but mechanical strength is low, cannot for a long time at high temperature, such as work at 100 DEG C, still not be able to satisfy industrial needs.In recent years, a kind of fluoroplastics of development, this plastics have extremely strong corrosion resistance, and at high temperature, also there is certain mechanical strength and service life, it is the ideal material for manufacturing noncorrosive pump, but it is difficult to form, currently fluoroplastics are used to the method gone on centrifugal pump casing as resistant material first is that spraying the internal layer of one layer of fluoroplastics in the shell of cast iron, though the internal layer of this spraying has certain corrosion-resisting function, but tissue looseness, mechanical strength is low, is easy to peel off.Method second is that in the shell of cast iron in fitted lining, because the small inner cavity of outer faucal of centrifugal pump is big, the way of the prior art is that one layer of belt is first wound in interior cavity mold type with the turning book film strips of fluoroplastics, then molding is re-sintered, and cast iron housing is made into can divide half-and-half open type, the winding of sinter molding is packed into the shell being separated in half with chamber lining shell, then is clamped with fastener.The centrifugal pump casing of this form manufactures time-consuming, and at high cost, structure is complicated for shell, and volume is big, and cavity wall smoothness difference causes the increase of frictional resistance and reduces the efficiency of pump.

One purpose of the utility model is to produce a kind of centrifugal pump housing with fluoroplastics liner, this small inner cavity of outer faucal is big, the liner has certain thickness and density to guarantee enough intensity, and the shell is whole rather than is separated in half.

The further object of the utility model is to design a kind of novel transfer modling or molding die, it can be in the small centrifugal pump housing of the big mouth of chamber using this mold, one layer of fluoroplastics liner with certain thickness and intensity is molded in pump case using transfer moudling or method of molding, without shell to be separated in half.

Another purpose of the utility model is to propose a kind of novel technique for successfully shaping liner with transfer moudling or method of molding in centrifugal pump shell body.

The utility model is achieved like this:

One centrifugal pump casing, it is made of casting of metals, such as cast iron, cast steel or stainless steel, with a flat circular shell of snail, it is stretched to center one end face of the shell, define the hole for being less than spiral case outer dimension, also stretching, extension forms a circle inward flange to the inner wall of the other end of the shell inwards, side wall between inward flange and other end be a curvilinear plane for example: the shape with an involute or Archimedes's helical line, side with holes, the side wall and inward flange of involute or Archimedes's helical line collectively define an inner cavity, housing side tangential direction stretches out a hollow outlet and communicates with inner cavity, the end of hollow circuit cylinder is surrounded with a circle flange.It is all molded with one layer of uniform, close, such as 3 to 6 millimeters of fluorine-type material coating with certain thickness and intensity in the inner wall i.e. outside of the inner face with hole end surface, inward flange, involute or Archimedes's helical line side wall and outside, inward flange with hole end surface of the shell, the plastic coating of fluoride has closely combination with the matrix such as cast iron matrix of metal.The fluoroplastics can be ultra-high molecular weight poly-fep, perfluoroethylene-propylene, polytrifluorochloroethylene, Kynoar, polyvinyl fluoride, vinylidene/chlorotrifluoroethylene, chlorotrifluoroethylene/ethylene copolymer, tetrafluoroethylene/ethylene copolymer, Meltability polytetrafluorethyletubular respectively, also other plastics can be used, such as polypropylene, polyethylene, modified polystyrene, polystyrene, polyamide, chlorinated polyether, polysulfones.As a variation, carbon fiber or 15% alkali-free neutral density glass fiber that the weight ratio containing inches long same plastics is 7% can also be equably blended in above-mentioned fluoroplastics and other plastics, can greatly improve the intensity and rotproofness of liner in this way.

The utility model has the whole centrifugal pump housing of fluoroplastics or other plastic inner linings compared with prior art, its advantage is that significantly.Liner is done due to using fluoroplastics, so having very strong wear-corrosion resistance, can be suitably used for various strong acid and strong bases, while it also can chronically be worked normally at a high temperature of up to 250 DEG C；Due to the shell with metal, thus have very high intensity, can use in various pressure pipings；Since the thickness of liner has 3 to 6 millimeters and forms a continuous shell, so liner layer itself has enough intensity and rigidity, liner will not fall off or wear out of shell；Since liner and metal shell are all whole, so transported medium will not leak between liner and shell and corrode metal shell；Because the surface smoothness of liner is higher, and plastics are very low to the adhesiveness of acid or liquid, therefore there is lesser coefficient of friction, to improve the efficiency of pump, according to surveying and determination, the efficiency of centrifugal pump with fluoroplastics liner may be up to for 66.9% (the general efficiency of pump is difficult beyond 65%), test measurement test report such as table through Shanghai Water Pump Plant.

The monoblock type of the utility model has the transfer modling of its liner of the centrifugal pump casing of plastic inner lining or molding is completed using pump housing pressing mold of the invention, the pump housing pressing mold has a pedestal, the pedestal is equipped with one and can be properly positioned at the positioning device at pump housing convex shoulder end and have a protrusion to stretch into pump case therebetween, described raises into multi-diameter shaft, one fixed trap, therewith at dynamic cooperation, then with screw is fixed the two in the maximum one section of outer circle of multi-diameter shaft base diameter；One there is the porose insert of housing cavity formed profiles Intermediate Gray to cover among the multi-diameter shaft on one section of lesser column of diameter, insert has the annular groove limited between the embeddable retainer plate of a convex shoulder and multi-diameter shaft close to retainer plate on one side, insert is broken down into several pieces radially towards inner extraction, such as six pieces, every piece is removably linked with screw with retainer plate, and one of insert and multi-diameter shaft key link and prevent insert from rotating relative to multi-diameter shaft；It is aligned on the insert side for the hollow outlet tube that tangent line stretches away on the shell and defines a positioning hole, the one elongated one outlet core rod with positioning pin is inserted into outlet, location hole in the positioning pin insertion of the one head insert, the other end protrusion of plug is outside outlet pipe flange, one protruding end and dynamic cooperation therewith with porose outlet cap sleeve-board in plug, the Outlet cover plate and outlet pipe flange are detachably connected, and outer end is pushed down with the boring cover that same Outlet cover plate is detachably connected again.

It the pedestal, retainer plate, insert and exports the shape of assembly of core rod and constitutes the cavity shape of pump case, and the assembly shape and surround its inner face of metal shell and collectively define the shape of molding layer.

The feed compartment of one hollow cylinder is covered is incorporated with a solid compression leg in the periphery that the pump case has lesser end face, feed compartment, and charging chamber is at dynamic cooperation.

The pump housing pressing mold of the utility model is compared with prior art, is had the advantages that outstanding.Because of the particular geometry that pump case has the big mouth of chamber small, so the pressing mold of prior art can not be put into or take out, pump case can only be thus separated in half rear lining, and the bright pump housing pressing mold of the utility model dexterously separates pressing mold, piecemeal is packed into pump case, they are then connected into solid mandrel again, mould is disassembled again after the completion of transfer modling formula model, block-by-block takes out, and this addresses the problem the technical problems that prior art cann't be solved.The pump housing pressing mold of the utility model also has the advantages of structure is simple, decomposition and combination is convenient, and positioning accuracy high energy is reused.

The pump case with fluoroplastics liner and other plastic inner linings of the utility model is carried out with the technique of the transfer modling of the utility model or molding, the technique is first in the type cavity portion of mold part coating release agent, then pump case pressing mold is assembled in the pump housing, the plastics of requirement or fluoroplastics are added to the feed compartment of mold, close compression leg, the weight of compression leg is precharge force value, then by fluoroplastics or plastic heating to melting temperature, applying pressure to compression leg on press again makes the material of melting state enrich the intracavitary each part of type, it is cooling that pressure maintaining is carried out to the mold of moulded products, if product need to increase toughness, then it is quenched with water, if product needs intensity, then use air into slow cooling, it is demoulded after intracavitary product sizing, take out product, fissureless inspection has been carried out to product again, it is examined for example, by using megameter exhausted Edge has measured free from flaw or has measured free from flaw with electric spark method, and tint various existing technologies, the products after examining such as display of others can also be used certainly and carry out ageing treatment again to eliminate internal stress to prevent from cracking.

Equipment required for the processing technology of the utility model is simple, and the product liner bubble-free processed, surface are smooth, transparent color and luster, liner is well combined with casing metal base, the cementability of example ultra-high molecular weight poly-fep and metal, and 45 steel are 141.5kg/cm²Stainless steel (1Cr18N9Ti) is 131.6kg/cm², aluminium (CD) is 133.6kg/cm²。

Illustrate a most preferred embodiment of the utility model below in conjunction with attached drawing,

Fig. 1 is the monoblock type of the utility model with the sectional front view of the centrifugal pump casing of plastic inner lining

Fig. 2 is the cross-sectional view along the direction Figure 1A-A,

Fig. 3 is that clamping enters to be intended to by the sectional front view of the pump case of compression moulding liner on the pump case pressing mold of the utility model,

Fig. 4 is the cross-sectional view along B-B direction shown in Fig. 3,

Such as Fig. 1, shown in 2, the pump housing [4] be by casting of metals at, the e.g. castings such as cast iron and steel, the pump housing [4] has flat snail round, the side wall [6] of pump has a curved shape face such as involute at Archimedes's spiral line shape curvilinear plane, one end face [13] of the pump case [4] is stretched radially inwards, define the hole [15] for being less than spiral case outer dimension, also stretching, extension forms flange [11] to the inner wall of the other end [10] of pump case [4] radially inwards, flange [11], pump side wall [6], end face [13] collectively defines chamber, pump case [4] side tangential direction tangentially flexes outward out a hollow cylindrical exit pipe [3], its inner duct can slightly have taper, flange [2] of the ring around outlet is radially outward extended into the end of outlet [3] , it is described by metal end face [13], pump side wall [6], 3-6 millimeters bigger than the size of the inner cavity after machine-shaping of the size of the inner cavity for the pump case [4] that end face [10] and outlet [3] limit jointly for compression moulding liner [14] use, end face [13] is lower than desired size 3-6 millimeters, end face [10] and flange [2] end face form the pit [1] lower than transverse plane 3-6 millimeters all for compression moulding liner layer [14], liner [14] on the inner wall of the cavity of metal and on end face [13] [10] face with one layer of plastic layer in pit [1] inner all compression moulding, the liner [14] and metallic matrix secure bond are integral, the plastics can be general engineering plastics, it is also possible to fluoroplastics, such as ultra-high molecular weight poly-fep, perfluoroethylene-propylene , polytrifluorochloroethylene, Kynoar, polyvinyl fluoride, vinylidene/chlorotrifluoroethylene, chlorotrifluoroethylene/ethylene copolymer, tetrafluoroethylene/ethylene copolymer, Meltability polytetrafluorethyletubular, be also possible to polypropylene, polyethylene, modified polystyrene, polystyrene, polyamide, chlorinated polyether, polysulfones.It can also equably be mixed in fluoroplastics and other plasticsThe glass fibre that the carbon fiber or inches of long weight ratios that the weight ratio of the long same fluoroplastic layer of inch is 7% are 15%, can greatly improve the intensity and wearability of liner in this way.

Inner liner portion on the inner wall of end face [13] and it preferably has 6 °~10 ° of pattern draft relative to vertical plane.

Flange [11] one end of shell [4] has a finished positioning cylindrical surface [12], and diameter and tolerance are depending on the design of the shape of product and pressing mold.

Such as Fig. 3, pedestal shown in 4 [21] has flat circle round-bottomed, an in-between upward step-like axis [33], stairstepping axis [33] is by three Duan Zucheng, the upper end section with such as 3 ° tapered of bullet section as pump housing pore size among the cylindrical section of nethermost major diameter, keyway [26] are had in conical section, the upper surface of bottom and a round-bottomed annular positioning groove [17] annular groove [17] coaxially recessed down, big diameter is that the size of the positioning cylindrical surface [14] of pump case [4] moves cooperation therewith, retainer plate [19], which covers to move therewith on the large-diameter circular shell of column of multi-diameter shaft [33], is higher by cylindrical section with merging, the raised area and the circular conical surface of intermediate cone section collectively define locating slot [20], with fastener such as screw by retainer plate and pedestal detachably connected one Body.Insert [16] has shape identical with pump case [4] chamber and the intermediate intermediate conical section for having hole that can be inserted in multi-diameter shaft [33], hole taper having the same simultaneously moves cooperation therewith, the side of the close locating slot [20] of insert [16] is protruding with positioning convex shoulder [18], and just movingly insertion locating slot [20] is interior, the insert [6] is radially resolved into several pieces, such as six pieces, (as listed by Fig. 4), wherein three pieces are identical sectors, three pieces are with tapered bar shaped, it is major part close to stepped shaft end, it is microcephaly close to pump case [4] inner wall end, the gradient on its every side can be tg3 °~tg8 °, the block of decomposition of one of insert has keyway, and inside load key [27] corresponding with the keyway [26] on multi-diameter shaft.It is defined location hole [28] in the side of the block of decomposition of the fan-shaped insert at outlet, each piece point of Jie's block all uses screw and retainer plate detachably connected.There is the positioning pin [29] of protrusion to be inserted into location hole [28] for one elongated outlet core rod [30] one end, plug [30] has the curvature as with insert at this with closely sealed with the shape for exporting lumen and with insert junction, plug [30], which stretches out a shape with cylinder of outlet end surfaces and accounts at center, to be tapped with internal screw thread and can be inserted into deep hole [31] Outlet cover plate [24] of thermoelectricity occasionally thermometer to be a flat annulus, garden ring inner hole is inserted in plug [30] cylindrical end and matched, the outer circle of annulus is identical with flange, position on ring corresponding to flange screw is also provided with the road hole [32] with counterbore, it is positioned again by the way that the same flange of fastener such as hexagon socket head cap screw [2] is fixed, bored plate [25] has also been screwed on Outlet cover plate [24] to push down plug.

In the end face of pump case [4], [13] one put on feed compartment [22] outside, the raw material for being intended to the liner of compression moulding can be added in its chamber, compression leg [23] with same feed compartment [22] chamber same shape is inserted into feed compartment [22] and therewith at very loose dynamic cooperation, compression leg [23] needs the precompression applied identical after there is certain weight and the mould to be put into furnace.

The pump housing pressing mold of the utility model uses 45 steel makings, and conditioned processing can also use 40Cr or other alloy steel makings.

The pump housing pressing mold of the utility model uses in this way, disassemble six pieces of insert [16] block-by-block sequences are first put into the interior intracavitary of the pump case for being intended to compression moulding liner, it is then placed in the positioning convex shoulder [18] that retainer plate [19] cutting ferrule enters insert [36], the two is fixed with screw again, it again will be in the hole of the multi-diameter shaft insertion insert of pedestal [21] by the keyway of key [27] alignment insert [16] on pedestal [21] multi-diameter shaft, plane positioning groove [17] set of pedestal is caught in the positioning external cylindrical surface [12] of shell, pedestal [21] and retainer plate [19] are integrally connected with screw again, outlet core rod [30] insertion is exported into lumen, its positioning pin [29] is inserted into location hole [28], Outlet cover plate [24] be inserted in outlet core rod [30] cylindrical end and and flange [ 2] it is fixed with bolt, along with bored plate [25] are fixed with the same cover board of bolt [24], after the completion of molding liner, the method for disassembly and the taking-up of pressing mold is just opposite with above-mentioned charging method sequence.

Describe the process of the pump housing lining pressing mold manufacture plastic pump casing lining using the utility model in detail again below,

1. high molecular weight perfluoroethylene-propylene pump case liner manufacturing process of example.

1. coating the 295 of such as one layer of release agent very book in the cavity portion of mold^#Or 293^#Silicone grease can also coat 956 after benzene dilutes^#Resin, but coast of paint film need to be formed through 300 DEG C of sintering.

2. then mold is integrally assembled and is finished as described above, assembling six pieces of inserts in pump case.

3. by the high molecular weight perfluoroethylene-propylene of requirement be added after weighing material room, after close compression leg.Required doses can be calculated as follows:

Doses material cavity volume × material specific gravity × 105%.

4. by it is assembled and be added material unitary mould be put into sintering furnace be heated to 280 DEG C keep the temperature 30~45 minutes, it is warming up to 310~320 DEG C again, heat preservation 30~45 minutes, the time of heating be best, the 30kg/cm for expecting compression column always in material room during heating in half flow regime with the F-46 material in feed compartment²Pressure, so that semifluid material is filled with type chamber.

5. by equipped with material mold taken out out of baking oven, be placed on above press and carry out pressure forming, the intracavitary semifluid material of type by unit pressure controlled in 80-120 kilograms per centimeter²(pressure that press machine should add is 80-120 kilograms per centimeter²Multiplied by the horizontal projected area of the compression moulding layer of product), the material of molten condition is enriched into the intracavitary each part of type under stress.

6. the mold of pair moulded products carries out pressure maintaining cooling, i.e., the pressure on the intracavitary material of the type of being applied to is not cancelled, mould is cooled down, if liner needs to increase toughness, can be quenched with water；If liner needs to increase intensity, air slow cooling can be used, until mould temperature is lower than 180 DEG C, the liner of compression moulding has been formed, and can be demoulded later.

7. the liner of pair compression moulding carries out quality examination, fluoroplastics should be translucent state, flawless and obvious steam bubble in appearance.Megaohm table look-up is used again, and megameter one end connects the metal shell of the pump housing, and the other end presss from both sides the cotton ball of dipped alcohol, clamps cotton ball with insulating bar, wipes inner lining surface, while shaking megameter, if occurring without breakdown, then it represents that do not have crack.

8. qualified product on inspection, then artificial aging processing is carried out, it is put into baking oven and is heated to 120 DEG C, 6 hours are kept the temperature, to eliminate the internal stress of inside liner.

The pump case liner manufacturing process of other several typical plastics of example 2., their technique are different only in that molding temperature and pressure difference, are now described below substantially as the processing technology of high molecular weight perfluoroethylene-propylene casing lining described in example 1:

Plastics title molding temperature DEG C molding pressure kg/cm ²160~190 120~160 polytrifluorochloroethylene 200-250 100-400 vinylidene of perfluoroethylene-propylene 280~350 40~100 Kynoar/chlorotrifluoroethylene 180-230 60-300 polytrifluorochloroethylene and vinylidene/chlorotrifluoroethylene 190-240 80-350 hybrid resin (the ratio between the former and the latter are 2: 1 or 1: 1) four Vinyl fluoride/ethylene copolymer 240-300 250-500

Chlorinated polyether 85-110 15-60 Fluoroine-containing plastic alloy 310-380 70-130 press machine should add to the power of compression leg are as follows:

Molding pressure × product compression moulding layer horizontal projected area

Table

Pump type	Flow Q		Lift H (rice)	Revolving speed n (rev/min)	Power N		Efficiency eta (%)	Impeller diameter D (millimeter)	Allow suction vacuum Hs (rice)
										(rice3/ when)	(liter/second)	Shaft power (kilowatt)	Motor power (output) (kilowatt)
	IP-50-40-140 type strong corrosion-resistant pump	14.4  20  23.4			4    5.6    6.5	29  26  24								2950  2950  2950	1.762.142.28	3    3    3	63.6  66.9  66.5	140    140    140	6.5    6.5    6.5

Claims (13)

1. a kind of centrifugal pump casing of the metal for the monoblock type for being related to non-positive-displacement pump case, with a flat circular shape of snail, it is stretched to center one end face, define the hole for being less than spiral case outer dimension, other end is also extended into a circle inward flange inwards, side wall between both ends of the surface is a curvilinear plane, the curvilinear plane can be involute face or Archimedes's helical line face, the tangential direction of the curved surface sidewall stretches out a hollow hollow cylinder communicated with inner cavity, the end circumferentially extending of hollow cylinder goes out the flange that a circle surrounds, it is characterized in that the cavity wall as defined by the end face and curved surface, tangentially extending hollow cylinder cavity wall and its end face of flange, there is one layer of uniform and parent metal good bond plastic layer on the outside of the outside with hole end surface and inward flange end face.

2. centrifugal pump casing as described in claim 1, it is characterised in that the plastic layer [14] with a thickness of 3-6 millimeters.

3. centrifugal pump casing as claimed in claim 1 or 2, it is characterised in that the material of the plastic layer [14] is ultra-high molecular weight poly-fep, poly(perfluoropropene), polychlorodifluoroethylene, Kynoar, polyvinyl fluoride, vinylidene/chlorotrifluoroethylene, chlorotrifluoroethylene/ethylene copolymer, tetrafluoroethylene/ethylene copolymer, Meltability polytetrafluorethyletubular is also possible to polypropylene, polyethylene, modified polystyrene, polystyrene, polyamide, chlorinated polyether, polysulfones.

4. centrifugal pump casing as claimed in claim 3, it is characterised in that the plastic layer [14] is inner, and can also to be equably blended with carbon fiber that inches long same plastic layer weight ratio is 7% or inches of long weight ratios be 15% alkaline glass fiber.

5. the centrifugal pump casing as described in claims 1 or 2 or 4, it is characterised in that the end face [13] and the inner liner portion above it have 6 °~10 ° pattern drafts.

6. centrifugal pump casing as claimed in claim 3, it is characterised in that the end face (13) and the inner liner portion above it have 6 °~10 ° pattern drafts

7. a kind of centrifugal pump casing plastic inner lining pressing mold, it is characterized in that it has a pedestal [21], the bottom surface of the pedestal [21] is equipped with a positioning groove [17] that can be located on shell, centre has a ladder crown of roll to play [33], retainer plate [19] covers on the garden multi-diameter shaft [33] base diameter maximum Duan Wai and therewith at dynamic cooperation, the two screw is detachably connected, one there is the porose insert of centrifugal pump casing cavity shape Intermediate Gray [16] to cover on the intermediate one section of lesser column of diameter of multi-diameter shaft [33], insert [16] is close to retainer plate [19] on one side with the annular groove [20] limited between a convex shoulder [18] insertion retainer plate [19] and multi-diameter shaft [33], insert [16] resolves into can be radially towards several pieces of inner extraction, such as six pieces, every piece of insert Removably linked with screw and retainer plate [19], a positioning hole [28] are defined on the insert side for the hollow outlet tube [3] that tangent line stretches away on alignment shell, one elongated one outlet core rod [30] the insertion outlet with positioning pin [29] is intracavitary, its positioning pin [29] insertion location hole [28], one covers the other end and the dynamic cooperation therewith in plug [30] with porose Outlet cover plate [24], Outlet cover plate [24] is detachably connected with outlet pipe flange [2] and is pushed down with boring cover [25], the feed compartment [22] of one hollow cylinder covers on the end face [13] of the centrifugal pump casing, equipped with solid a compression leg [23] and material room [22] at dynamic cooperation in feed compartment.

8. pressing mold as claimed in claim 7, it is characterised in that six pieces of inserts disassembled wherein three pieces be it is fan-shaped, three pieces be with tapered bar shaped, close to multi-diameter shaft [33] end be major part, close to shell ends be microcephaly.

9. pressing mold as claimed in claim 8, it is characterised in that the gradient with tapered bar shaped is tg3 °~tg8 °

10. pressing mold as claimed in claim 7, it is characterised in that the intermediate ends of multi-diameter shaft [33] are the conical sections with keyway [26], and insert hole is the taper hole with identical taper, is also provided with corresponding keyway on the block of decomposition of one of insert.

11. pressing mold as claimed in claim 10, it is characterised in that the taper of the conical bore of the interlude and insert of the circular cone is 2tg3 °.

12. pressing mold as claimed in claim 7, it is characterised in that there is a deep hole that can be inserted into thermometer or thermocouple at the center of the outlet core rod [30].

13. pressing mold as claimed in claim 7, it is characterised in that the compression leg [23] required identical weight of operation pressure applied after there is mould to be put into furnace.

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