CN210548085U

CN210548085U - Double-layer or multilayer refractory metal composite pipe preparation mold

Info

Publication number: CN210548085U
Application number: CN201920890072.6U
Authority: CN
Inventors: 张晓�; 安耿; 卜春阳; 赵虎; 刘仁智; 朱琦; 何凯; 庄飞
Original assignee: Jinduicheng Molybdenum Co Ltd
Current assignee: Jinduicheng Molybdenum Co Ltd
Priority date: 2019-06-13
Filing date: 2019-06-13
Publication date: 2020-05-19
Anticipated expiration: 2029-06-13

Abstract

The utility model discloses a compound tubular product preparation mould of double-deck or multilayer refractory metal specifically is: the core mould comprises a core mould, a rubber cylinder and a fixed cylinder which are sequentially sleeved from inside to outside, a cavity is formed between the rubber cylinder and the core mould, and end plugs are arranged at two ends of the cavity to form a sealed forming cavity. The utility model discloses can realize that the pipe is from interior to outer successive layer press forming, the interior size precision that has improved tubular product simultaneously is high, reduced and reserved the processingquantity, improved former material powder utilization ratio, not only is suitable for the preparation of refractory metal bilayer or multilayer composite metal tubular product outside, still can be applied to the composite forming of other bilayer or multilayer metal tubular products.

Description

Double-layer or multilayer refractory metal composite pipe preparation mold

Technical Field

The utility model belongs to the technical field of the metal composite pipe material, a double-deck or multilayer refractory metal composite pipe material preparation mould is related to.

Background

The refractory metal and the refractory metal alloy have the advantages of high melting point, high-temperature strength and the like, and are important high-temperature structural materials. The use temperature of refractory metals and their alloys is directly related to their melting points, and molybdenum alloys, tungsten alloys, niobium alloys, and the like are used in many cases. The molybdenum alloy has the defects of low-temperature brittleness, welding brittleness, difficult processing, poor high-temperature oxidation resistance and the like, so that the application range of the molybdenum alloy is limited. Mo-Nb, Mo-W, Mo-Ta and the like are infinite solid solution alloys, and the problems of high-temperature phase transformation, brittleness and the like do not exist, so that the addition of W, Nb and Ta in a certain proportion to Mo is one of effective ways for improving the performance of the molybdenum-based alloy. Meanwhile, a proper amount of second-phase reinforcing particles (rare earth oxide or ceramic phase) are introduced into the refractory metal matrix, and the performance of the refractory metal matrix composite is obviously higher than that of the refractory alloy.

In consideration of the specificity of the requirements on the material properties in practical application, the double-layer or multi-layer pipe can meet the functional realization of refractory metals.

The existing double-layer or multi-layer pipe is generally obtained by sintering after pressure forming, and the pressure forming is carried out after the pipe is assembled. Through the respective certain amount of deformation of the interface areas of the steel pipes, the interface metallurgical bonding of the fresh surfaces of the steel pipes and the fresh surfaces of the steel pipes is realized under the action of higher temperature and higher pressure stress, and the bonding rate is higher. The deformation of the tube cannot be accurately controlled in the pressure forming process, so that the wall thickness, the roundness of the inner hole, the coaxiality of the inner hole and other dimensional deviations of the tube are caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a compound tubular product preparation mould of double-deck or multilayer refractory metal has solved among the prior art problem that tubular product size deformation that double-deck or multilayer tubular product press forming obtained can not accurate control.

The utility model discloses the technical scheme who adopts is, a compound tubular product preparation mould of double-deck or multilayer refractory metal, include by interior and the mandrel, packing element and the fixed section of thick bamboo that establish is overlapped outward in proper order, form the die cavity between packing element and the mandrel, and the die cavity both ends are provided with the end plug, form sealed die cavity.

The utility model is also characterized in that,

the core mould (2) is tubular, and anti-skid structures (2-1) are arranged on the periphery of the core mould (2) close to two ends.

The anti-skid structure (2-1) is a plurality of groove rings (2-2) arranged on the outer wall of the core mould (2).

The outer diameter of the core mould close to the two ends is slightly smaller than that of other parts.

The longitudinal section of the fixed cylinder is convex, and the diameter of the cylinder body of the fixed cylinder close to the lower end is larger than the diameter of the rest part of the cylinder body.

The height of the small diameter part of the fixed cylinder is slightly higher than the height of the forming cavity.

And an injection hole is formed in the position of the forming cavity on the fixed cylinder.

The diameter of the injection hole is 10-15 mm.

The height of the core mould and the height of the rubber cylinder are both higher than that of the fixed cylinder.

The height of the end plug is 40-100 mm, the thickness of the rubber cylinder (5) is 5-10 mm, and the thickness of the fixed cylinder (6) is 5-10 mm.

The beneficial effects of the utility model are that, the utility model discloses a rigidity mandrel, pipe inner wall size precision is high, directly passes through substrate inside pipe wall location, has realized that the pipe is followed interior to outer successive layer press forming, and the size and the form and position tolerance of the tubular product of acquisition are compared skew little before sintering. Meanwhile, the internal dimensional accuracy of the tube blank is improved, the reserved processing amount is reduced, and the utilization rate of raw material powder is improved. The utility model discloses the mould not only is suitable for the preparation of refractory metal bilayer or multilayer composite metal tubular product, still can be applied to the compound shaping of other bilayer or multilayer metal tubular products.

Drawings

FIG. 1 is a schematic structural view of an isostatic pressing mold used in the present invention;

fig. 2 is a schematic view of the anti-slip structure on the core mold.

In the figure, 1-1 is an upper end plug, 1-2 is a lower end plug, 2 is a core die, 2-1 is an anti-skid structure, 2-2 is a groove ring, 3 is a core blank, 4 is a cavity, 5 is a rubber cylinder, and 6 is a fixed cylinder.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

The utility model relates to a compound tubular product preparation mould of double-deck or multilayer refractory metal, its structure is shown in figure 1, include by interior and outer mandrel 2, packing element 5 and the solid fixed cylinder 6 of establishing of overlapping in proper order, form die cavity 4 between packing element 5 and the solid fixed

cylinder

6, 4 both ends in die cavity are provided with end plug 1-1 and lower end plug 1-2 respectively, form sealed one-tenth die cavity.

Wherein the core mould 2 and the fixed cylinder 6 are both rigid moulds.

The core mould 2 is tubular, the outer diameter of the core mould 2 close to two ends is 0.02-0.05mm smaller than that of other parts, the outer wall forming cavity of the core mould 2 is smooth, and anti-skid structures 2-1 are arranged on the periphery close to two ends, as shown in figure 2, the anti-skid structures 2-1 are a plurality of groove rings 2-2 arranged on the outer wall of the core mould 2.

The fixed cylinder 6 is a convex cylinder, namely the longitudinal section is convex, and the diameter of the cylinder body close to the lower end is larger than that of the rest part of the cylinder body. The bottom of the convex cylinder is ensured to be level with the bottoms of the core mould 2 and the rubber cylinder 5, so that the rubber cylinder can be fixed to ensure the overall dimension.

And the fixed cylinder 6 is provided with an injection hole for injecting a cold isostatic pressing medium between the fixed cylinder 6 and the rubber cylinder 5, and the injection hole is positioned at the position of the forming cavity.

The heights of the core mold 2 and the rubber cylinder 5 are higher than that of the fixed cylinder 6, and the height of the part with the small diameter of the fixed cylinder 6 is slightly higher than that of the molding cavity.

The height of the upper end plug 1-1 and the height of the lower end plug 1-2 are both 40-100 mm, the thickness of the rubber cylinder 5 is 5-10 mm, the thickness of the fixing cylinder 6 is 5-10 mm, and the aperture of the injection hole is 10-15 mm.

The end plug, the rubber cylinder and the fixed cylinder need to be matched with the core mould 2 and other structures to be replaced according to different structural layers of the pipe.

The process of carrying out the press blank forming of the refractory metal pipe by adopting the die specifically comprises the following steps:

1. selecting a core mould 2 according to the requirement of the inner diameter size of the composite pipe, placing a lower end plug 1-2, an external rubber cylinder 5 and the bottom of the contact part of the external rubber cylinder 5 and the core mould 2 on the lower part of the core mould 2 in a manner of clinging to the outer wall, and installing a fixed cylinder 6 outside the rubber cylinder 5; and (3) filling the first layer of refractory metal granulation powder A in the tube blank obtained in the step (1) into the cavity (4), and installing and sealing an end plug 1-1 at the upper part of the rubber cylinder 5.

The sealing mode can be realized by installing a binding structure outside the cylinder body, for example, a metal wire is wound around and fastened at the position to be sealed. The seal is wound around the periphery of the rubber tube 5 where the end plug is located.

2. And (4) putting the filled die into a cold isostatic press for pressing and releasing pressure.

In the pressing process, cold isostatic pressing medium enters a gap between the rubber cylinder 5 and the fixed cylinder 6 of the die through the injection hole, and acts on the rubber cylinder 5 to enable the rubber cylinder 5 to be compressed inwards and form a tube blank.

3. Lifting the mould from the cold isostatic press, removing the fixed cylinder 6 and the rubber cylinder 5, exposing the core blank 3 formed in the cavity 4, finishing the core blank 3 with the core mould 2 to ensure the regular appearance of the core blank 3, then replacing the end plug, the rubber cylinder 5 and the fixed cylinder 6 with corresponding sizes according to the thickness of the next layer of the pipe to be pressed, reassembling the end plug, the rubber cylinder 5 and the fixed cylinder 6 with the core blank with the core mould 2, and filling the second layer of refractory metal granulation powder B of the pipe into the isostatic press mould for pressing;

and 2.4, repeating the step 2.3, and pressing the pipe blank layer by layer from inside to outside until the last layer of refractory metal granulated powder is pressed, trimming the pipe blank, and removing the core mold 2 to obtain the double-layer or multi-layer refractory metal pipe blank.

Through adopting the utility model discloses mould preparation double-deck or multilayer refractory metal composite billet has guaranteed that the pressed compact inner chamber size is accurate, directly fixes a position through the substrate tube hole, has reduced and has reserved the work load, has obtained the double-deck or multilayer refractory metal pipe that the pressed compact density uniformity is good simultaneously.

Claims

1. The utility model provides a double-deck or multilayer refractory metal composite pipe preparation mould, its characterized in that includes mandrel (2), rubber tube (5) and a fixed section of thick bamboo (6) that from interior to exterior overlaps in proper order and establishes, forms die cavity (4) between rubber tube (5) and mandrel (2), and die cavity (4) both ends are provided with the end plug, form sealed die cavity.

2. The mold for manufacturing the double-layer or multi-layer refractory metal composite pipe according to claim 1, wherein the core mold (2) is tubular, and anti-skid structures (2-1) are arranged around the core mold (2) near two ends.

3. The mould for the production of a double-layer or multi-layer refractory metal composite pipe according to claim 2, wherein the anti-slip structure (2-1) is a plurality of groove rings (2-2) formed on the outer wall of the core mould (2).

4. The mold for manufacturing double-layer or multi-layer refractory metal composite pipes according to claim 1, wherein the outer diameter of the core mold (2) near two ends is slightly smaller than the outer diameter of other parts.

5. The mold for manufacturing the double-layer or multi-layer refractory metal composite pipe according to claim 1, wherein the longitudinal section of the fixed cylinder (6) is convex, and the diameter of the cylinder body of the fixed cylinder (6) close to the lower end is larger than that of the rest part of the cylinder body.

6. The mould for the production of double-or multilayer refractory metal composite tubes as claimed in claim 5, wherein the small diameter part of the fixed cylinder (6) has a height slightly higher than the height of the forming cavity.

7. The mould for preparing the double-layer or multi-layer refractory metal composite pipe according to claim 1, wherein the position of the forming cavity on the fixed cylinder (6) is provided with an injection hole.

8. The mold for manufacturing the double-layer or multi-layer refractory metal composite pipe according to claim 7, wherein the diameter of the injection hole is 10-15 mm.

9. The mould for making double-layer or multi-layer refractory metal composite pipes according to claim 1 is characterized in that the height of the core mould (2) and the height of the rubber cylinder (5) are both higher than that of the fixed cylinder (6).

10. The mold for preparing the double-layer or multi-layer refractory metal composite pipe according to claim 1, wherein the height of the end plug is 40-100 mm, the thickness of the rubber tube (5) is 5-10 mm, and the thickness of the fixed tube (6) is 5-10 mm.