CN102434665A - Light gradient hard-alloy sealing ring and manufacture method thereof - Google Patents

Abstract

The invention discloses a light gradient hard-alloy sealing ring and a manufacture method thereof. The light gradient hard-alloy sealing ring is characterized by comprising a working part and a non-working part, wherein the working part comprises 90-94 percent by weight of tungsten carbide and 6-10 percent by weight of nickel or cobalt and has a layer thickness of 1.0-2.5mm, and the non-working part comprises 40-60 percent by weight of titanium carbide powder, 10-18 percent by weight of nickel powder and 22-50 percent by weight of tungsten carbide powder. The manufacture method comprises the steps of: during pressing, firstly, weighing a hard alloy material for the working part, adding in a steel die for calibrating, weighing a light hard alloy material for the non-working part, adding in the steel die for calibrating, and applying pressure for pressing and forming, then placing into a furnace for sintering to obtain two parts of hard alloy sealing rings made from different components. The light gradient hard-alloy sealing ring has the advantages of reduced density, tungsten resource saving and low cost in comparison with the hard alloy sealing ring produced by integrally adopting tungsten carbide, nickel or cobalt, and can be used in a seal or shaft sleeve of pumps or kettles.

Description

Lightweight gradient hard alloy seal ring and production method thereof

Technical field

The present invention relates to seal ring that a kind of lightweight gradient hard alloy material makes and hard with the lightweight gradient

The matter alloy is made the method for seal ring.

Background technique

At number of patent application is in the patent documentation of 200610155270.5 " light hard alloy seal ring and production methodes thereof ", discloses a kind of light hard alloy seal ring, and sealing material is made up of titanium carbide, nickel, Tungsten carbite and titanium.Though this method has reached the saving tungsten resource, reduce the cost of raw material, and in the high temperature use occasion, can reach the purpose that improves high temperature resistance, decay resistance, increases the service life.But the sealing and the axle sleeve that are used for various pump classes or still class, most situation are to use in low temperature (≤800 ℃) occasion, and the material that is adopted is the cemented carbide that is the basis with Tungsten carbite, nickel or cobalt, does not hope to occur elements such as titaniferous.Too much Ti content can make the Hardmetal materials of Tungsten carbite, nickel or cobalt become fragile and the polishing machine variation, shortens seal ring working life widely.

Summary of the invention

The objective of the invention is provides a kind of and does not contain practicing thrift tungsten resource and reducing under the cost of raw material condition

Titanium can not make the Hardmetal materials of Tungsten carbite, nickel or cobalt become fragile and the polishing machine variation, shortens seal ring the lightweight gradient hard alloy seal ring and the production method thereof in working life.

To achieve these goals, technological scheme of the present invention is that a kind of lightweight gradient hard alloy seal ring is characterized in that the sealing ring is made up of working position and inoperative position; Said working position is a Hardmetal materials, is made up of by weight percentage Tungsten carbite, nickel or cobalt: Tungsten carbite is 90-94%, and nickel or cobalt are that 6-10% evenly mixes, and bed thickness is 1.0-2.5mm; Said inoperative position is the light hard alloy material, is made up of by weight percentage titanium carbide, Tungsten carbite, nickel: carbonized titanium powder is a 40-60% weight, and nickel powder is a 10-18% weight, and tungsten carbide powder is 22-50%; During compacting; The Hardmetal materials that elder generation uses the weighing working position, add draw together in the punching block flat, the light hard alloy material used of weighing inoperative position again; Draw together flat in the adding punching block; The compression moulding of exerting pressure is put into the stove sintering with the goods of moulding, the sintered article that obtains form the different gradient hard alloy seal ring of two-part composition.

A kind of production method of lightweight gradient hard alloy seal ring may further comprise the steps:

A. prepare the Tungsten carbite nickel or the cobalt mixture of working position:

A) be 90-94% with Tungsten carbite, nickel or cobalt by Tungsten carbite, nickel or cobalt are that the 6-10% weight percent evenly mixes;

B) above-mentioned even mixture is put into the pebble mill wet-milling, ratio of grinding media to material is 4:1, and solid-to-liquid ratio is 1kg/300ml, normal temperature ball milling 24 hours;

The wet feed that c) will grind with the vacuum drier recovered alcohol after, dry with the vapour seasoning case again;

D) will dryly cross powder, and add SD glue or gasoline rubber liquid forming agent to stir 2 minutes, adding the glue amount is 90ml glue/1kg material, and the 60-100 order sieves;

B. prepare the light hard alloy mixture at inoperative position

A) will be 40-60% by carbonized titanium powder by titanium carbide, Tungsten carbite, nickel, nickel powder be 10-18%, and tungsten carbide powder is that the 22-50% weight percent evenly mixes;

B) add the SD glue or gasoline rubber liquid moulding dosage is 120ml glue/1kg material;

The wet feed that c) will grind with the vacuum drier recovered alcohol after, dry with the vapour seasoning case again;

D) will dryly cross powder, and add SD glue or gasoline rubber liquid forming agent to stir 2 minutes, adding the glue amount is 90ml glue/1kg material, and the 60-100 order sieves;

C. compression moulding

A) because two kinds of mixture shrinkage coefficients have certain difference; In order to prevent to deform behind the seal ring sintering, its tolerance of size does not meet usage requirement, should process the pressed compact that a kind of above and below is the trapezoidal ring bodies on parallel inclined-plane earlier; As shown in Figure 1, and characterize by following parameter; Straight when meeting size requirement lightweight gradient hard alloy seal ring working position thickness h at 1.0-2.5mm when obtaining behind the sintering, as shown in Figure 2, each dimensional parameters meets following relation: , , D _{Pressed compact}=(1.22-1.24) D, d _{Pressed compact}=(1.22-1.24) d, h _{Pressed compact}=(1.22-1.24) h, H _{Pressed compact}=(1.22-1.24) H;

Each parameter is in the formula:

d _{Pressed compact}Mean inside diameter for trapezoidal ring bodies pressed compact;

h _{Pressed compact}Thickness for pressed compact working position materials;

H _{Pressed compact}Be trapezoidal ring bodies vertical height;

α 1 is the angle between trapezoidal ring bodies pressed compact outer surface and the vertical surface;

α 2 is the angle between trapezoidal ring bodies pressed compact end face and the horizontal plane;

α 3 is the angle between trapezoidal ring bodies pressed compact internal surface and the vertical surface;

D is the external diameter of lightweight gradient hard alloy seal ring;

D is the internal diameter of lightweight gradient hard alloy seal ring;

H is the thickness of lightweight gradient hard alloy seal ring;

H is for being lightweight gradient hard alloy seal ring working position thickness;

B) first weighing adds Tungsten carbite, nickel or the cobalt mixture of working position in the punching block chamber, draws together flatly, and then weighing adds the light hard alloy mixture at inoperative position, draws together flatly, applies 60-100MPa/cm ³Pressure forming;

D. sintering processing

A) stampings of above-mentioned machine shaping are put into the vacuum furnace sintering, temperature is controlled at 1420-1500 ℃ in the stove, is incubated 2-3 hour;

B) product surface of sintering is by the dimension precision requirement abrasive machining, and warehouse-in is up to the standards.

The described Tungsten carbite of inoperative part is meant electrolysis Tungsten carbite or the broken powder material of scrap hard alloy after scrap hard alloy reclaims.

Because in the compositing formula of the present invention, working portion has adopted conventional Tungsten carbite, nickel or cobalt class hard to close

Gold copper-base alloy; The material prescription similar with light hard alloy adopted at the inoperative position; Therefore adopt above-mentioned prescription with the advantage of the seal ring of technological method preparation to be: compare with the hard alloy seal ring that integral body adopts Tungsten carbite, nickel or cobalt class to produce, density is from 14.5-15.0g/cm ³Reduce to 7.8-9.5 g/cm ³, practice thrift more than the tungsten resource 50% (weight) conservation cost 30-60%; Compare, do not change routine (low temperature environment) and be used for the sealing of pump class or still class or the usage requirement and the capability and performance of axle sleeve with the described seal ring of number of patent application 200610155270.5 " slight hard alloy seal ring and production method thereof ".

Description of drawings

Fig. 1 is a lightweight gradient hard alloy seal ring pressed compact shape schematic representation;

Fig. 2 is a lightweight gradient hard alloy seal ring sinter schematic representation;

Fig. 3 is a lightweight gradient hard alloy seal ring schematic representation behind embodiment's 1 sintering;

Fig. 4 is embodiment's 1 lightweight gradient hard alloy seal ring pressed compact schematic representation;

Fig. 5 is a lightweight gradient hard alloy seal ring schematic representation behind embodiment's 2 sintering;

Fig. 6 is embodiment's 2 lightweight gradient hard alloy seal ring pressed compact schematic representation.

Dimensional units represented among Fig. 3-Fig. 6 is represented with mm.

Embodiment

Embodiment 1

Lightweight gradient hard alloy seal ring divides two-part to form the composition of working position: Tungsten carbite 94%

Weight, nickel 6% weight; The composition at inoperative position: titanium carbide 52% weight, Tungsten carbite 32% weight, nickel 16% weight; The blank behind the sintering that requires see shown in Figure 3.Technology goes on foot to gather and is summarized as follows: the weighing by weight proportion of above-mentioned various compositions is mixed; The working position is respectively charged into wet-milling in the different pebble mill with inoperative position mixture, and ratio of grinding media to material is 4:1, and solid-to-liquid ratio is that 1kg/300ml carried out the normal temperature ball milling 24 hours; After ball milling is good working position and inoperative position wet feed used vacuum drier (Z type mixer) recovered alcohol respectively, dry with the Steam dry case again; The dry powder of crossing is added SD glue (or gasoline rubber liquid) forming agent stir (2 minutes), it is 90ml/1kg that the working position powder adds the glue amount, and the glue amount that adds at inoperative position is 120ml/1kg, and the 60-100 order sieves; Claim that earlier working portion powder 99g puts into punching block and draws together flatly, the powder 226g that claims the inoperative position again adds and draws together flatly in the punching block, and 60-100MPa/cm exerts pressure ³Compression moulding; The pressed compact shape of being suppressed is as shown in Figure 4; Angle

,

Above-mentioned compression and moulding goods are put into the vacuum furnace sintering, and temperature control is 1470-1490 ℃ in the stove, is incubated 2-3 hour, and the sinter shape and size that obtain are seen Fig. 3; With bad skiving of the hair processing of sinter molding, make dimensional accuracy reach usage requirement, after the assay was approved warehouse-in; It is following that said products is measured the result with sample mode: comprehensive density 8.06g/cm ³, working position hardness 90.5HRA, comprehensive resistance to flexure (graded alloy calibrated bolck, working position thickness 2.5mm) 1860MPa, working position porosity A02, B02, C00.

Embodiment 2

Lightweight gradient hard alloy seal ring divides two-part to form the composition of working position: Tungsten carbite 92%

Weight, nickel 8% weight; The composition at inoperative position: titanium carbide 44% weight, Tungsten carbite 44% weight, nickel 12% weight, the blank behind the sintering that requires see shown in Figure 5.Technology goes on foot to gather and is summarized as follows: the weighing by weight proportion of above-mentioned various compositions is mixed; The working position is respectively charged into wet-milling in the different pebble mill with inoperative position mixture; Ratio of grinding media to material is 4:1, and solid-to-liquid ratio is 1kg/300ml, carries out the normal temperature ball milling 24 hours; After ball milling is good working position and inoperative position wet feed used vacuum drier (Z type mixer) recovered alcohol respectively, dry with the Steam dry case again; The dry powder of crossing is added SD glue (or gasoline rubber liquid) forming agent stir (2 minutes), the working position powder adds glue amount 90ml/1kg, and the glue amount that adds at inoperative position is 120ml/1kg, and the 60-100 order sieves; Claim earlier working position powder 35g, put into punching block and draw together flatly that the powder 106g that claims the inoperative position again adds and draws together flatly in the punching block, 60-100MPa/cm exerts pressure ³Compression moulding; The pressed compact shape of being suppressed is as shown in Figure 6; Angle

,

Above-mentioned compression and moulding article are put into the vacuum furnace sintering, and temperature control is 1420-1460 ℃ in the stove, is incubated 2-3 hour, and the sinter shape and size that obtain are seen shown in Figure 5; With the blank skiving processing of sinter molding, make dimensional accuracy reach usage requirement, after the assay was approved warehouse-in; It is following that said products is recorded the result with sample mode: comprehensive density 8.85g/cm ³, working position hardness 89.5HRA, comprehensive resistance to flexure (graded alloy calibrated bolck, working position thickness 1.5mm) 1950MPa, working position porosity A02, B02, C00.

Claims (2)

1. a lightweight gradient hard alloy seal ring is characterized in that, the sealing ring is made up of working position and inoperative position; Said working position is a Hardmetal materials, is made up of by weight percentage Tungsten carbite, nickel or cobalt: Tungsten carbite is 90-94%, and nickel or cobalt are that 6-10% evenly mixes, and bed thickness is 1.0-2.5mm; Said inoperative position is the light hard alloy material, is made up of by weight percentage titanium carbide, Tungsten carbite, nickel: carbonized titanium powder is a 40-60% weight, and nickel powder is a 10-18% weight, and tungsten carbide powder is a 22-50% weight; During compacting; The Hardmetal materials that elder generation uses the weighing working position, add draw together in the punching block flat, the light hard alloy material used of weighing inoperative position again; Draw together flat in the adding punching block; The compression moulding of exerting pressure is put into the stove sintering with the goods of moulding, the sintered article that obtains form the different gradient hard alloy seal ring of two-part composition.

2. the production method of a lightweight gradient hard alloy seal ring may further comprise the steps:

A. prepare Tungsten carbite, nickel or the cobalt mixture of working position:

A) be 90-94% with Tungsten carbite, nickel or cobalt by Tungsten carbite, nickel or cobalt are that the 6-10% weight percent evenly mixes;

B) above-mentioned even mixture is put into the pebble mill wet-milling, ratio of grinding media to material is 4:1, and solid-to-liquid ratio is 1kg/300ml, normal temperature ball milling 24 hours;

The wet feed that c) will grind with the vacuum drier recovered alcohol after, dry with the vapour seasoning case again;

D) will dryly cross powder, and add SD glue or gasoline rubber liquid forming agent to stir 2 minutes, adding the glue amount is 90ml glue/1kg material, and the 60-100 order sieves;

B. prepare the light hard alloy mixture at inoperative position

A) will be 40-60% by carbonized titanium powder by titanium carbide, Tungsten carbite, nickel, nickel powder be 10-18%, and tungsten carbide powder is that the 22-50% weight percent evenly mixes;

B) add the SD glue or gasoline rubber liquid moulding dosage is 120ml glue/1kg material;

The wet feed that c) will grind with the vacuum drier recovered alcohol after, dry with the vapour seasoning case again;

D) will dryly cross powder, and add SD glue or gasoline rubber liquid forming agent to stir 2 minutes, adding the glue amount is 90ml glue/1kg material, and the 60-100 order sieves;

C. compression moulding

A) because two kinds of mixture shrinkage coefficients have certain difference, and in order to prevent to deform behind the seal ring sintering, its tolerance of size does not meet usage requirement, and should process a kind of above and below earlier is the trapezoidal ring bodies on parallel inclined-plane, and the pressed compact that characterizes with following parameter; Straight when meeting size requirement lightweight gradient hard alloy seal ring working position thickness h at 1.0-2.5mm when obtaining behind the sintering, each dimensional parameters meets following relation:

, , D _{Pressed compact}=(1.22-1.24) D, d _{Pressed compact}=(1.22-1.24) d, h _{Pressed compact}=(1.22-1.24) h, H _{Pressed compact}=(1.22-1.24) H;

Each parameter is in the formula:

d _{Pressed compact}Mean inside diameter for trapezoidal ring bodies pressed compact;

h _{Pressed compact}Thickness for pressed compact working position materials;

H _{Pressed compact}Be trapezoidal ring bodies vertical height;

α ₁Be the angle between trapezoidal ring bodies pressed compact outer surface and the vertical surface;

α ₂Be the angle between trapezoidal ring bodies pressed compact end face and the horizontal plane;

α 3 is the angle between trapezoidal ring bodies pressed compact internal surface and the vertical surface;

D is the external diameter of lightweight gradient hard alloy seal ring;

D is the internal diameter of lightweight gradient hard alloy seal ring;

H is the thickness of lightweight gradient hard alloy seal ring;

H is a lightweight gradient hard alloy seal ring working position thickness;

B) first weighing adds Tungsten carbite, nickel or the cobalt mixture of working position in the punching block chamber, draws together flatly, and then weighing adds the light hard alloy mixture at inoperative position, draws together flatly, applies 60-100MPa/cm ³Pressure forming;

D. sintering processing

A) stampings of above-mentioned machine shaping are put into the vacuum furnace sintering, temperature is controlled at 1420-1500 ℃ in the stove, is incubated 2-3 hour;

B) product surface of sintering is by the dimension precision requirement abrasive machining, and warehouse-in is up to the standards.

Images