CN107538006B - Machining device and method for hard alloy valve core of throttle valve - Google Patents
Machining device and method for hard alloy valve core of throttle valve Download PDFInfo
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- CN107538006B CN107538006B CN201710353944.0A CN201710353944A CN107538006B CN 107538006 B CN107538006 B CN 107538006B CN 201710353944 A CN201710353944 A CN 201710353944A CN 107538006 B CN107538006 B CN 107538006B
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Abstract
The invention provides a processing device and a processing method for a hard alloy valve core of a throttle valve, wherein the processing device comprises an outer sleeve, an outer sleeve leakage-proof plate, a partition plate, an inner sleeve leakage-proof plate, a punching rod, a working box, a lower extrusion block and an upper extrusion block; an outer sleeve, an outer sleeve leakage-proof plate, a baffle plate, an inner sleeve and an inner sleeve leakage-proof plate are sequentially arranged on the lower extrusion block from outside to inside, and the upper extrusion block is aligned with the axis of the inner sleeve and is arranged above the inner sleeve; the work box is the heat insulation box, and inside below is equipped with the base, and extrusion piece under the base mid-mounting, the base side is equipped with the tongs telescopic link to be equipped with the tongs that extend to extrusion piece top down at the tongs telescopic link top, the work box top is equipped with the slide rail, installs extrusion piece telescopic link in the slide rail below, goes up extrusion piece telescopic link and can follow the slide rail and slide, goes up extrusion piece telescopic link below and connects extrusion piece. The invention achieves the purpose of manufacturing the double-layer hard alloy valve core by designing the valve core processing device which is suitable for the hard alloy valve core structure of the throttle valve and providing a method.
Description
Technical Field
The invention relates to the technical field of cemented carbide, in particular to a processing device and a processing method for a cemented carbide valve core of a throttle valve.
Background
In the exploitation process of natural gas wells, throttle valves are required to be installed on a gas exploitation wellhead and various manifolds and other high-pressure pipelines for adjusting the natural gas exploitation flow. The core component of the throttle valve is a valve core, the purpose of adjusting flow is achieved by arranging a plurality of small holes on the valve core and adjusting the position of the valve core in a flow channel, at present, the valve core of a certain throttle valve used in a certain domestic oil field is of a hollow tubular structure composed of hard alloy (the main components are WC and Co) as shown in figure 1, a plurality of small holes which are spirally arranged are arranged on the valve core, the installation mode of the throttle valve is as shown in figure 2, the valve core can move up and down in the flow channel, and at present, the processing method of the hard alloy valve core of the structure is as follows: the method comprises the steps of compacting in a mould, sintering at high temperature and high pressure in a furnace, annealing in a tempering furnace, cooling to normal temperature, taking out and clamping on a machine tool for grinding, wire cutting or electric spark machining, wherein the method is time-consuming and labor-consuming, particularly in the process of final drilling, the angle of a valve core is required to be continuously changed in the process of machining, a clamp can generate certain abrasion and internal stress concentration on the surface of the hard alloy, so that potential safety hazards are left on the valve core of the hard alloy, the valve core can move up and down in a flow passage in use of a throttle valve, the number of throttle holes for circulating gas in the flow passage is regulated, the valve core is eroded by natural gas flowing at high speed for a long time, damage easily occurs, particularly, the part of a small hole is the most serious part of natural gas erosion, the later machining often causes the surface roughness of the small hole, burrs can exist on the edge, and the problem occurs easily under the condition of natural gas erosion.
Meanwhile, the hard alloy valve core adopted at present is mainly formed by mixing WC and Co with partial other metal elements, compacting and sintering after raw materials are mixed, the valve core prepared by adopting the formula and the method has the same hardness from inside to outside, the valve core is arranged in a valve body flow channel, the best structure is in an outer hard and inner soft state, the outer part is made of harder materials, the valve core can have better erosion resistance when being eroded, the inner part is made of softer materials, the valve core body can keep better toughness, the valve core structure is kept stable when being subjected to external force, and the valve core is not easy to be broken integrally.
At present, there is a study on double-layer hard alloy structures at home and abroad, such as a method for preparing particles of hard alloy/steel laminated composite material by melt-dipping and casting in China patent (application number 201110374632.0), the method is that steel balls are placed inside, then the steel balls are processed on the outer valve cover hard alloy, the ball processed in the method can meet the requirement of abrasion, but the anti-scouring effect of hollow cylinder is difficult to realize, and the hollow cylinder cannot be processed in the same way, so that small holes on the hollow cylinder cannot be processed. In chinese patent (application No. 201310724238.4) & ltdouble-layer cemented carbide substrate and preparation method thereof & ltdouble-layer cemented carbide substrate & gt, a method of preforming the cemented carbide of the outer layer into a U-shape and then using it as a container to place the cemented carbide of the inner layer and sintering, but this method can only produce solid cemented carbide of the U-shape structure, and cannot be used for manufacturing the valve core structure. Therefore, the device and the method for achieving the deep processing of the valve core of the throttle valve can overcome the problems, and have great significance for improving the use effect of the valve core.
Disclosure of Invention
In view of the above problems, the present invention provides a processing device and method for a cemented carbide valve core of a throttle valve, which is adapted to a cemented carbide valve core structure of the throttle valve, and provides a specific operation method thereof, so as to achieve the purpose of manufacturing a double-layer cemented carbide valve core.
The technical scheme of the invention is as follows:
the processing device for the hard alloy valve core of the throttle valve consists of an outer sleeve, an outer sleeve leakage-proof plate, a partition plate, an inner sleeve leakage-proof plate, a punching rod, a working box, a lower extrusion block and an upper extrusion block; an outer sleeve, an outer sleeve leakage-proof plate, a baffle plate, an inner sleeve and an inner sleeve leakage-proof plate are sequentially arranged on the lower extrusion block from outside to inside, and the upper extrusion block is aligned with the axis of the inner sleeve and is arranged above the inner sleeve;
the outer sleeve is a hollow cylinder, the height is 150mm, and the inner diameter is 60mm; the inner sleeve is a solid cylinder, the height is 150mm, and the outer diameter is 45mm; the partition board is a metal thin circular ring, the height is 160mm, the inner diameter is 55mm, the thickness is 0.2mm, and a crisscrossed thin rod is arranged above the partition board and used as a partition board hanging frame;
the outer sleeve leakage-proof plate is a metal thin circular ring, the height is 180mm, the outer diameter is 60mm, the thickness is 0.1mm, and a crisscrossed thin rod is arranged above the outer sleeve leakage-proof plate and used as a leakage-proof plate hanging frame; the inner sleeve leakage-proof plate is a metal thin circular ring, the height is 180mm, the inner diameter is 45mm, the thickness is 0.1mm, and the upper part of the inner sleeve leakage-proof plate is also connected to the leakage-proof plate hanger;
the lower extrusion block is of a disc structure, the middle part of the lower extrusion block is provided with a circular boss, the height of the circular boss is 30mm, the outer diameter of the circular boss is identical to the inner diameter of the outer sleeve, the inner diameter of the circular boss is identical to the outer diameter of the inner sleeve, the circular boss of the lower extrusion block can be clamped between the inner sleeve and the outer sleeve, the middle part of the circular boss is provided with a slot which is used as a 1# slot, the inner diameter of the slot is 55mm, the depth of the slot is 30mm, and the width of the slot is 0.2mm, so that the partition plate can be placed in the 1# slot;
the upper extrusion block is of a hollow cylindrical boss structure, the height of the hollow cylindrical boss is 70mm, the outer diameter of the hollow cylindrical boss is the same as the inner diameter of the outer sleeve, the inner diameter of the hollow cylindrical boss is the same as the outer diameter of the inner sleeve, so that the hollow cylindrical boss of the upper extrusion block can be clamped between the inner sleeve and the outer sleeve, a thin groove is formed in the middle of the hollow cylindrical boss, the hollow cylindrical boss is used as a No. 2 thin groove, the inner diameter of the hollow cylindrical boss is 55mm, the width of the hollow cylindrical boss is 0.2mm, the depth of the hollow cylindrical boss is 70mm, and meanwhile 4 crisscrossed thin slits are formed in the hollow cylindrical boss, so that the thin groove can penetrate through a crisscrossed baffle hanger and an outer sleeve hanger;
the outer sleeve is provided with outer sleeve holes, the partition plate is provided with partition plate holes, the inner sleeve is provided with inner sleeve counter bores, the outer sleeve holes and the partition plate holes are of a through hole structure, the diameter is 8mm, the inner sleeve counter bores are of a counter bore structure, the diameter is 8mm, the depth is 5mm, the outer sleeve holes, the partition plate holes and the inner sleeve holes are 12, the outer sleeve holes are divided into 3 rows with the same interval, each row is 4 of an axial array, the outer sleeve holes of the lower row and the upper row are of an angle difference of 5 degrees anticlockwise in the axial direction, the arrangement method of the partition plate holes and the inner sleeve holes is the same as that of the outer sleeve holes, and the heights are kept consistent;
the outer diameter of the perforating rod is 8mm, and the perforating rod horizontally penetrates through the outer sleeve small hole and the baffle small hole from outside to inside and abuts against the inner sleeve counter bore under the condition that the outer sleeve leakage-proof plate and the inner sleeve leakage-proof plate are not used.
Further, the work box is the heat insulation box, and inside below is equipped with the base, and extrusion piece under the base mid-mounting, the base side is equipped with the tongs telescopic link to be equipped with the tongs that extend to extrusion piece top down at the tongs telescopic link top, the work box top is equipped with the slide rail, and extrusion piece telescopic link is installed to the slide rail below, goes up extrusion piece telescopic link and can follow the slide rail and slide, goes up extrusion piece telescopic link below and connects extrusion piece, makes it on the slide rail with extrusion piece axial alignment down.
Further, after the upper extrusion block telescopic rod is retracted, the distance between the upper extrusion block telescopic rod and the top of the inner sleeve is larger than 300mm. The design ensures that the gripper can have enough space to grasp and lift the outer sleeve leakage-proof plate and the inner sleeve leakage-proof plate.
Furthermore, the punching rod is of a hollow cylindrical structure, and the front end of the punching rod is provided with an inwardly convergent cutting edge.
A processing method of a hard alloy valve core for a throttle valve comprises the following steps:
s1, sequentially mounting an inner sleeve, a baffle plate and an outer sleeve on a circular boss and a No. 1 slot of a lower extrusion block, wherein corresponding inner sleeve small holes, baffle plate small holes and outer sleeve counter bores are required to be ensured to be in the same straight line in the mounting process, a punching rod can be adopted for insertion to ensure that three holes are aligned in a straight line, then an outer sleeve leakage-proof plate and an inner sleeve leakage-proof plate are respectively mounted on the inner side of the outer sleeve and the outer side of the inner sleeve by being tightly stuck, and the crisscross structure of a leakage-proof plate hanger and the crisscross structure of the baffle plate hanger are required to be ensured to be in a longitudinal alignment state in the mounting process;
s2, hard alloy particles used for manufacturing the valve core are divided into two types, the first hard alloy particles are filled between the inner sleeve leakage-proof plate and the partition plate, the filling is stopped after the filling is carried out to a required height, the second hard alloy particles are filled between the outer sleeve leakage-proof plate and the partition plate, and the filling is stopped after the filling is carried out to the required height;
s3, operating the upper extrusion block telescopic rod to move right above the inner sleeve on the sliding rail, axially aligning the upper extrusion block telescopic rod, downwards stretching the upper extrusion block telescopic rod until the upper extrusion block telescopic rod just contacts the upper side of the leak-proof plate hanging frame, rotating and adjusting the upper extrusion block to align a thin seam of the upper extrusion block telescopic rod with the leak-proof plate hanging frame and the partition plate hanging frame, continuing to operate the upper extrusion block telescopic rod to descend, respectively starting to compress the first hard alloy particles and the second hard alloy particles on the inner side and the outer side of the partition plate, wherein the pressure is 2T, so that the two hard alloy particles can achieve the effect of compressing to a certain degree but not compressing, and then recovering the upper extrusion block telescopic rod to the top end;
s4, operating a gripper telescopic rod to enable the gripper to move to the upper portion of the leakproof plate hanging frame, grabbing the leakproof plate hanging frame, then slowly moving upwards to lift the leakproof plate hanging frame, driving the outer sleeve leakproof plate and the inner sleeve leakproof plate to be pulled out together, and then enabling the gripper to move to the side face, so that the upper extrusion block is not hindered;
s5, inserting a punching rod into the small hole of the outer sleeve, penetrating the punching rod inwards until the punching rod is inserted into the counter bore of the inner sleeve to be abutted against, then stretching the telescopic rod of the upper extrusion block downwards again, enabling the upper extrusion block to compress the first hard alloy particles and the second hard alloy particles on the inner side and the outer side of the partition plate again, enabling the pressure to be 5T, thoroughly compressing the two hard alloy particles, initially shaping the hard alloy particles at the moment, keeping the structure stable, then extracting the punching rod outwards, moving the telescopic rod of the upper extrusion block upwards, and taking out the partition plate by using a gripper;
s6, reinserting the punching rod, propping against the counter bore of the inner sleeve, then using the upper extrusion block to compress the hard alloy again, so that gaps between two hard alloy particles caused by the partition plates are filled, and after the hard alloy particles are compressed, sequentially pulling out the punching rod, lifting the upper extrusion block telescopic rod, taking out the outer sleeve and taking out the inner sleeve, and leaving a valve core pressed compact;
s7, performing vacuum sintering on the valve core pressed compact, heating the furnace temperature to 1500 ℃, then performing annealing treatment, performing linear cutting on two ends of the treated valve core to remove the part exceeding the length, and simultaneously removing protruding lines on the upper surface and the lower surface of the valve core, which are caused by the 1# slot, the 2# slot and the fine seam of the upper extrusion block and the lower extrusion block; obtaining the final hard alloy valve core finished product.
Further, in the step S2, the first cemented carbide grain is a cemented carbide grain with a grade of 50 mesh YG6, and the formulation thereof is 94% WC, 5% Co, 0.5% Ni, 0.5% Cr, and the hardness thereof after sintering is HRA91;
the second hard alloy particle is a 50-mesh YG10 hard alloy particle, and the formula of the second hard alloy particle comprises 90% of WC, 9% of Co, 0.5% of Ni and 0.5% of Cr, and the hardness of the second hard alloy particle after sintering processing is HRA88;
further, in the step S2, the heights of the two added cemented carbide particles are required to exceed the actual requirements, so as to compensate for the small amount of cemented carbide particles which are inserted into the hole punching rod to be brought into the counter bore of the inner sleeve and pulled out of the hole of the outer sleeve in the process of S5.
The beneficial effects of the invention are as follows:
1. according to the invention, the small holes are prepared before sintering by combining the mode of punching the hole rod for multiple times, so that the mode of post-processing the small holes is not needed, the processing time is saved, the processing difficulty is reduced, and the clamping damage to the valve core during post-processing of the small holes is avoided;
2. by arranging the partition plate, hard alloy particles of the valve core can be composed of two different materials and are divided into an inner layer and an outer layer, different hardness is formed after sintering, the valve core has an outer layer to ensure scouring strength, an inner layer to improve bending resistance, and the service life of the valve core is greatly prolonged
3. Through multiple experiments, the pressure values of 2T and 5T are determined to be the data most suitable for the early-stage pressing of the hard alloy, and the mold and the punching rod can be prevented from being damaged on the premise of compacting the hard alloy with the thickness.
Drawings
FIG. 1 is a schematic diagram of a valve core structure;
FIG. 2 is a block diagram of the installation of a valve element in a valve seat;
FIG. 3 is a half cross-section of a cemented carbide core machining device body structure at a first stage;
FIG. 4 is a top view of the cemented carbide core machining device body configuration at a first stage;
FIG. 5 is a half cross-section of the body structure of the cemented carbide core machining device in a second stage;
FIG. 6 is a top view of the cemented carbide core machining device body configuration in a second stage;
FIG. 7 is a half cross-section of the cemented carbide core machining apparatus in use at a second stage;
fig. 8 is a perspective view of the outer sleeve;
fig. 9 is a front view of the outer sleeve;
FIG. 10 is a semi-sectional view of the hole drilling rod;
FIG. 11 is a perspective view of the upper squeeze block;
FIG. 12 is a perspective view of a lower squeeze block;
fig. 13 is a schematic view of the overall structure of the present invention.
The figure shows:
1. the outer sleeve, 2, the outer sleeve leakage-proof plate, 3, the partition plate, 4, the inner sleeve leakage-proof plate, 5, the inner sleeve, 6, the punching rod, 7, the working box, 8, the upper extrusion block, 9, the lower extrusion block, 10, the valve core,
11. the anti-leakage plate comprises an outer sleeve small hole, 21, an anti-leakage plate hanging frame, 31, a baffle hanging frame, 32, a baffle small hole, 51, an inner sleeve counter bore, 71, a base, 72, a gripper telescopic rod, 73, a gripper, 74, a sliding rail, 75, an upper extrusion block telescopic rod, 101 and an orifice.
Detailed Description
The invention will be further described with reference to the drawings and examples.
As shown in fig. 1-13, a processing device for a hard alloy valve core of a throttle valve consists of an outer sleeve 1, an outer sleeve leakage-proof plate 2, a partition plate 3, an inner sleeve 5, an inner sleeve leakage-proof plate 4, a punching rod 6, a working box 7, a lower extrusion block 9 and an upper extrusion block 8; an outer sleeve 1, an outer sleeve leakage-proof plate 2, a partition plate 3, an inner sleeve 5 and an inner sleeve leakage-proof plate 4 are sequentially arranged on a lower extrusion block 9 from outside to inside, and an upper extrusion block 8 is aligned with the axis of the inner sleeve 5 and is arranged above the inner sleeve 5; the jacket 1 is a hollow cylinder, the height is 150mm, and the inner diameter is 60mm; the inner sleeve 5 is a solid cylinder, the height is 150mm, and the outer diameter is 45mm; the partition plate 3 is a metal thin circular ring, the height is 160mm, the inner diameter is 55mm, the thickness is 0.2mm, and a crisscrossed thin rod is arranged above the partition plate 3 and used as a partition plate hanging frame 31; the outer sleeve leakage-proof plate 2 is a metal thin circular ring, the height is 180mm, the outer diameter is 60mm, the thickness is 0.1mm, and a crisscrossed thin rod is arranged above the outer sleeve leakage-proof plate and is used as a leakage-proof plate hanging frame 21; the inner sleeve leakage-proof plate 4 is a metal thin circular ring, the height is 180mm, the inner diameter is 45mm, the thickness is 0.1mm, and the upper part of the inner sleeve leakage-proof plate 4 is also connected to the leakage-proof plate hanger 21; the lower extrusion block 9 is of a disc structure, a circular boss is arranged in the middle of the lower extrusion block 9, the height of the circular boss is 30mm, the outer diameter of the circular boss is identical to the inner diameter of the outer sleeve 1, the inner diameter of the circular boss is identical to the outer diameter of the inner sleeve 5, the circular boss of the lower extrusion block 9 can be clamped between the inner sleeve 5 and the outer sleeve 1, a slot is formed in the middle of the circular boss, the circular boss is used as a 1# slot, the inner diameter of the slot is 55mm, the depth of the slot is 30mm, and the width of the slot is 0.2mm, so that the partition plate 3 can be placed in the 1# slot; the upper extrusion block 8 is of a hollow cylindrical boss structure, the height of the hollow cylindrical boss is 70mm, the outer diameter of the hollow cylindrical boss is the same as the inner diameter of the outer sleeve 1, the inner diameter of the hollow cylindrical boss is the same as the outer diameter of the inner sleeve 5, so that the hollow cylindrical boss of the upper extrusion block 8 can be clamped between the inner sleeve 5 and the outer sleeve 1, a slot is formed in the middle of the hollow cylindrical boss, the slot is used as a No. 2 slot, the inner diameter of the slot is 55mm, the width of the slot is 0.2mm, the depth of the slot is 70mm, and meanwhile, the hollow cylindrical boss is also provided with 4 crisscrossed slots, so that the slot can pass through a crisscrossed baffle hanger 31 and an outer sleeve 1 plate hanger; the outer sleeve 1 is provided with an outer sleeve small hole 11, the partition plate 3 is provided with a partition plate small hole 32, the inner sleeve 5 is provided with an inner sleeve counter bore 51, the outer sleeve small hole 11 and the partition plate small hole 32 are of a through hole structure, the diameter is 8mm, the inner sleeve counter bore 51 is of a counter bore structure, the diameter is 8mm, the depth is 5mm, the outer sleeve small hole 11, the partition plate small hole 32 and the inner sleeve 5 small hole are 12, the outer sleeve small hole 11 is divided into 3 rows with the same interval, each row is 4 of an axial array, the outer sleeve small hole 11 of the lower row and the upper row are of an angle difference of 5 degrees in an anticlockwise direction in the axial direction, and the arrangement method of the partition plate small hole 32 and the inner sleeve 5 small hole is the same as that of the outer sleeve small hole 11, and the heights are kept consistent; the outer diameter of the perforating rod 6 is 8mm, and the perforating rod 6 horizontally penetrates through the outer sleeve small hole 11 and the baffle small hole 32 from outside to inside and abuts against the inner sleeve counter bore 51 under the condition that the outer sleeve leakage preventing plate 2 and the inner sleeve leakage preventing plate 4 are not used; the work box 7 is the heat insulation box, inside below is equipped with base 71, extrusion piece 9 under the base 71 mid-mounting, the base 71 side is equipped with tongs telescopic link 72 to be equipped with the tongs 73 that extend to extrusion piece 9 top down on tongs telescopic link 72 top, work box 7 top is equipped with slide rail 74, and extrusion piece telescopic link 75 is installed to slide rail 74 below, goes up extrusion piece telescopic link 75 and can follow slide rail 74, goes up extrusion piece 8 in connection below extrusion piece telescopic link 75, makes it on slide rail 74 with extrusion piece 9 axial alignment down, go up extrusion piece telescopic link 75 and retract the back, its interval with endotheca 5 top is greater than 300mm, perforating rod 6 is the cavity tubular structure, and perforating rod 6 front end is equipped with the blade of inside convergence.
The perforated rod 6 is made of metal material, such as stainless steel, the wall thickness is 0.5mm, the cutting edge is sharp, the perforated rod can not be clamped in the process of inserting hard alloy particles, and the throttle hole 101 can be effectively cut off after the perforated rod is inserted.
The cross thin rods of the leak-proof plate hanging frame 21 and the baffle plate hanging frame 31 are round rods, and the diameter of the thin rods is 1mm, so that the thin slits of the upper extrusion block 8 are also 1mm wide.
The inner and outer matching is clearance matching, if the inner diameter of the outer sleeve 1 is the same as the outer diameter of the circular boss, the inner diameter of the outer sleeve 1 is slightly larger than the outer diameter of the circular boss in actual processing, so that the inner diameter and the outer diameter can be clamped into matching.
The processing method of the hard alloy valve core 10 for the throttle valve comprises the following steps:
s1, sequentially mounting an inner sleeve 5, a baffle plate 3 and an outer sleeve 1 on a circular boss and a No. 1 slot of a lower extrusion block 9, wherein corresponding small holes of the inner sleeve 5, small holes 32 of the baffle plate and counter holes of the outer sleeve 1 are required to be ensured to be in the same straight line in the mounting process, a punching rod 6 can be adopted to insert the holes to ensure that three holes are aligned in a straight line, then an outer sleeve leakage-proof plate 2 and an inner sleeve leakage-proof plate 4 are respectively mounted on the inner side of the outer sleeve 1 and the outer side of the inner sleeve 5, and the crisscross structure of a leakage-proof plate hanger 21 and the crisscross structure of the baffle plate hanger 31 are required to be ensured to be in a longitudinal alignment state in the mounting process;
s2, the hard alloy particles used for manufacturing the valve core 10 are divided into two types, the first hard alloy particles are filled between the inner sleeve leakage-proof plate 4 and the partition plate 3, the filling is stopped after the filling is carried out to a required height, the second hard alloy particles are filled between the outer sleeve leakage-proof plate 2 and the partition plate 3, and the filling is stopped after the filling is carried out to the required height;
the first hard alloy particle is a 50-mesh YG6 hard alloy particle, and the formula of the first hard alloy particle is 94% WC, 5% Co, 0.5% Ni and 0.5% Cr; the second hard alloy particle is a 50-mesh YG10 hard alloy particle, and the formula of the second hard alloy particle comprises 90% of WC, 9% of Co, 0.5% of Ni and 0.5% of Cr;
s3, operating the upper extrusion block telescopic rod 75 to move right above the inner sleeve 5 on the sliding rail 74, axially aligning the sliding rail 74, stretching the upper extrusion block telescopic rod 75 downwards until the upper extrusion block telescopic rod is just contacted with the upper side of the leak-proof plate hanging frame 21, rotating and adjusting the upper extrusion block 8 to align a fine seam of the upper extrusion block 8 with the leak-proof plate hanging frame 21 and the partition plate hanging frame 31, then continuing to operate the upper extrusion block telescopic rod 75 downwards, respectively starting to compress the first hard alloy particles and the second hard alloy particles on the inner side and the outer side of the partition plate 3, wherein the pressure is 2T, so that the two hard alloy particles can achieve the effect of compressing to a certain extent but not compressing, and then recovering the upper extrusion block telescopic rod 75 to the top end;
s4, operating the gripper telescopic rod 72 to enable the gripper 73 to move to the upper side of the leakage-proof plate hanging frame 21, grabbing the leakage-proof plate hanging frame 21, then slowly moving upwards, lifting the leakage-proof plate hanging frame 21, driving the outer sleeve leakage-proof plate 2 and the inner sleeve leakage-proof plate 4 to be pulled out together, and then enabling the gripper 73 to move to the side without obstructing the operation of the upper extrusion block 8; during the extraction process, a small amount of carbide particles are extracted along with the outer sleeve leakage preventing plate 2 and the inner sleeve leakage preventing plate 4, and a small amount of carbide particles can flow out along the outer sleeve small hole 11 and fall into the inner sleeve counter bore 51, and as the allowance of the part is considered in S2, and enough carbide particles are added, the loss of the part is negligible;
s5, inserting the punching rod 6 into the small hole 11 of the outer sleeve, penetrating inwards through the small hole 32 of the partition plate until the inner sleeve counter bore 51 is abutted, then stretching the upper extrusion block telescopic rod 75 downwards again, enabling the upper extrusion block 8 to compress the first hard alloy particles and the second hard alloy particles on the inner side and the outer side of the partition plate 3 again, enabling the pressure to be 5T, thoroughly compressing the two hard alloy particles, enabling the hard alloy particles to be primarily shaped at the moment, keeping the structure stable, then extracting the punching rod 6 outwards, moving the upper extrusion block telescopic rod 75 upwards, and taking out the partition plate 3 by using the gripper 73;
s6, reinserting the punching rod 6, abutting against the inner sleeve counter bore 51, and then compressing the hard alloy again by using the upper extrusion block 8, wherein in order to increase the compaction efficiency of the step, a circular metal sheet can be used for covering and fixing the upper extrusion block 8, so that the entry of hard alloy particles in the fine slits and the No. 2 fine grooves on the upper extrusion block 8 during extrusion is avoided; gaps between two hard alloy particles, which are generated by the partition plate 3, are filled, after the two hard alloy particles are compressed, the punching rod 6 is sequentially pulled out, the upper extrusion block telescopic rod 75 is lifted, the outer sleeve 1 is taken out, the inner sleeve 5 is taken out, and a valve core 10 pressed blank is left;
s7, performing vacuum sintering on the valve core 10 pressed compact, heating the furnace temperature to 1500 ℃, then performing annealing treatment, performing linear cutting on two ends of the treated valve core 10 to remove the excess length part, and simultaneously removing protruding lines on the upper surface and the lower surface of the valve core 10, which are caused by the 1# slot, the 2# slot and the slot of the upper extrusion block 8 and the lower extrusion block 9; obtaining the final hard alloy valve core 10 finished product.
During pressing, the prior art can provide 100T pressure, and according to multiple experiments, the pressures of 2T and 5T can be most suitable for the processed valve core, and pollution can be achieved
The throttle valve hard alloy valve core 10 manufactured by the method can be formed at one time, and various problems caused by secondary small hole machining in the later stage are avoided; in the process of compacting, as the upper extrusion block 8 and the lower extrusion block 9 are provided with the slots, certain flaws are formed on the upper end face and the lower end face, but as the hard alloy valve core 10 is always left with a certain margin in the process of processing, the hard alloy valve core can be cut off once in the process of later cutting off the margin, the later work is not hindered, no new problem is added, in fact, the bottom is provided with redundant slender protrusions, the compacting in the sintering process is enabled to be less in contact with the placing surface, the heat received by the bottom is more sufficient, the hardness of the whole valve core 10 is more uniform, and the problem that the bottom is worse in heating condition due to contact with the placing surface in the prior processing is well avoided.
The present invention is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalents and modifications can be made to the above-mentioned embodiments without departing from the scope of the invention.
Claims (4)
1. The processing device for the hard alloy valve core of the throttle valve is characterized by comprising an outer sleeve, an outer sleeve leakage-proof plate, a partition plate, an inner sleeve leakage-proof plate, a punching rod, a working box, a lower extrusion block and an upper extrusion block; an outer sleeve, an outer sleeve leakage-proof plate, a baffle plate, an inner sleeve and an inner sleeve leakage-proof plate are sequentially arranged on the lower extrusion block from outside to inside, and the upper extrusion block is aligned with the axis of the inner sleeve and is arranged above the inner sleeve;
the outer sleeve is a hollow cylinder, the height is 150mm, and the inner diameter is 60mm; the inner sleeve is a solid cylinder, the height is 150mm, and the outer diameter is 45mm; the partition board is a metal thin circular ring, the height is 160mm, the inner diameter is 55mm, the thickness is 0.2mm, and a crisscrossed thin rod is arranged above the partition board and used as a partition board hanging frame;
the outer sleeve leakage-proof plate is a metal thin circular ring, the height is 180mm, the outer diameter is 60mm, the thickness is 0.1mm, and a crisscrossed thin rod is arranged above the outer sleeve leakage-proof plate and used as a leakage-proof plate hanging frame; the inner sleeve leakage-proof plate is a metal thin circular ring, the height is 180mm, the inner diameter is 45mm, the thickness is 0.1mm, and the upper part of the inner sleeve leakage-proof plate is also connected to the leakage-proof plate hanger;
the lower extrusion block is of a disc structure, the middle part of the lower extrusion block is provided with a circular boss, the height of the circular boss is 30mm, the outer diameter of the circular boss is identical to the inner diameter of the outer sleeve, the inner diameter of the circular boss is identical to the outer diameter of the inner sleeve, the circular boss of the lower extrusion block can be clamped between the inner sleeve and the outer sleeve, the middle part of the circular boss is provided with a slot which is used as a 1# slot, the inner diameter of the slot is 55mm, the depth of the slot is 30mm, and the width of the slot is 0.2mm, so that the partition plate can be placed in the 1# slot;
the upper extrusion block is of a hollow cylindrical boss structure, the height of the hollow cylindrical boss is 70mm, the outer diameter of the hollow cylindrical boss is the same as the inner diameter of the outer sleeve, the inner diameter of the hollow cylindrical boss is the same as the outer diameter of the inner sleeve, so that the hollow cylindrical boss of the upper extrusion block can be clamped between the inner sleeve and the outer sleeve, a thin groove is formed in the middle of the hollow cylindrical boss, the hollow cylindrical boss is used as a No. 2 thin groove, the inner diameter of the hollow cylindrical boss is 55mm, the width of the hollow cylindrical boss is 0.2mm, the depth of the hollow cylindrical boss is 70mm, and meanwhile 4 crisscrossed thin slits are formed in the hollow cylindrical boss, so that the thin groove can penetrate through a crisscrossed baffle hanger and an outer sleeve hanger;
the outer sleeve is provided with outer sleeve holes, the partition plate is provided with partition plate holes, the inner sleeve is provided with inner sleeve counter bores, the outer sleeve holes and the partition plate holes are of a through hole structure, the diameter is 8mm, the inner sleeve counter bores are of a counter bore structure, the diameter is 8mm, the depth is 5mm, the outer sleeve holes, the partition plate holes and the inner sleeve holes are 12, the outer sleeve holes are divided into 3 rows with the same interval, each row is 4 of an axial array, the outer sleeve holes of the lower row and the upper row are of an angle difference of 5 degrees anticlockwise in the axial direction, the arrangement method of the partition plate holes and the inner sleeve holes is the same as that of the outer sleeve holes, and the heights are kept consistent;
the outer diameter of the perforating rod is 8mm, and the perforating rod horizontally penetrates through the outer sleeve small hole and the baffle small hole from outside to inside and abuts against the inner sleeve counter bore under the condition that the outer sleeve leakage-proof plate and the inner sleeve leakage-proof plate are not used;
the working box is a heat insulation box body, a base is arranged below the inside of the working box, a lower extrusion block is arranged in the middle of the base, a gripper telescopic rod is arranged on the side face of the base, a gripper extending to the upper side of the lower extrusion block is arranged at the top end of the gripper telescopic rod, a sliding rail is arranged at the top of the working box, an upper extrusion block telescopic rod is arranged below the sliding rail, and the upper extrusion block telescopic rod can slide along the sliding rail, and the upper extrusion block is connected below the upper extrusion block telescopic rod so as to be axially aligned with the lower extrusion block on the sliding rail;
after the upper extrusion block telescopic rod is retracted, the distance between the upper extrusion block telescopic rod and the top of the inner sleeve is larger than 300mm;
the punching rod is of a hollow cylindrical structure, and the front end of the punching rod is provided with an inwardly convergent cutting edge;
the perforating rod is made of metal, the wall surface thickness of the perforating rod is 0.5mm, the cutting edge is sharp, the perforating rod cannot be clamped in the process of inserting hard alloy particles, and the orifice is cut after the perforating rod is inserted;
the thin rods of the cross of the leak-proof plate hanging frame and the baffle hanging frame are round rods, the diameter of the thin rods is 1mm, and the width of the thin slits of the upper extrusion block is also 1 mm.
2. A method for processing a hard alloy valve core for a throttle valve, characterized in that the processing device for the hard alloy valve core for the throttle valve according to claim 1 is adopted, and comprises the following steps:
s1, sequentially mounting an inner sleeve, a baffle plate and an outer sleeve on a circular boss and a No. 1 slot of a lower extrusion block, wherein corresponding inner sleeve small holes, baffle plate small holes and outer sleeve counter bores are required to be ensured to be in the same straight line in the mounting process, a punching rod is adopted to insert so as to ensure that three holes are aligned in a straight line, then an outer sleeve leakage-proof plate and an inner sleeve leakage-proof plate are respectively mounted on the inner side of the outer sleeve and the outer side of the inner sleeve, and the crisscross structure of a leakage-proof plate hanger and the crisscross structure of the baffle plate hanger are required to be ensured to be in a longitudinal alignment state in the mounting process;
s2, hard alloy particles used for manufacturing the valve core are divided into two types, the first hard alloy particles are filled between the inner sleeve leakage-proof plate and the partition plate, the filling is stopped after the filling is carried out to a required height, the second hard alloy particles are filled between the outer sleeve leakage-proof plate and the partition plate, and the filling is stopped after the filling is carried out to the required height;
s3, operating the upper extrusion block telescopic rod to move right above the inner sleeve on the sliding rail, axially aligning the upper extrusion block telescopic rod, downwards stretching the upper extrusion block telescopic rod until the upper extrusion block telescopic rod just contacts the upper side of the leak-proof plate hanging frame, rotating and adjusting the upper extrusion block to align a thin seam of the upper extrusion block telescopic rod with the leak-proof plate hanging frame and the partition plate hanging frame, continuing to operate the upper extrusion block telescopic rod to descend, respectively starting to compress the first hard alloy particles and the second hard alloy particles on the inner side and the outer side of the partition plate, wherein the pressure is 2T, so that the two hard alloy particles can achieve the effect of compressing to a certain degree but not compressing, and then recovering the upper extrusion block telescopic rod to the top end;
s4, operating a gripper telescopic rod to enable the gripper to move to the upper portion of the leakproof plate hanging frame, grabbing the leakproof plate hanging frame, then slowly moving upwards to lift the leakproof plate hanging frame, driving the outer sleeve leakproof plate and the inner sleeve leakproof plate to be pulled out together, and then enabling the gripper to move to the side face, so that the upper extrusion block is not hindered;
s5, inserting a punching rod into the small hole of the outer sleeve, penetrating the punching rod inwards until the punching rod is inserted into the counter bore of the inner sleeve to be abutted against, then stretching the telescopic rod of the upper extrusion block downwards again, enabling the upper extrusion block to compress the first hard alloy particles and the second hard alloy particles on the inner side and the outer side of the partition plate again, enabling the pressure to be 5T, thoroughly compressing the two hard alloy particles, initially shaping the hard alloy particles at the moment, keeping the structure stable, then extracting the punching rod outwards, moving the telescopic rod of the upper extrusion block upwards, and taking out the partition plate by using a gripper;
s6, reinserting the punching rod, propping against the counter bore of the inner sleeve, then using the upper extrusion block to compress the hard alloy again, so that gaps between two hard alloy particles caused by the partition plates are filled, and after the hard alloy particles are compressed, sequentially pulling out the punching rod, lifting the upper extrusion block telescopic rod, taking out the outer sleeve and taking out the inner sleeve, and leaving a valve core pressed compact;
s7, performing vacuum sintering on the valve core pressed compact, heating the furnace temperature to 1500 ℃, then performing annealing treatment, performing linear cutting on two ends of the treated valve core to remove the part exceeding the length, and simultaneously removing protruding lines on the upper surface and the lower surface of the valve core, which are caused by the 1# slot, the 2# slot and the fine seam of the upper extrusion block and the lower extrusion block; obtaining the final hard alloy valve core finished product.
3. The method according to claim 2, wherein in the step S2, the first cemented carbide particles are cemented carbide particles of the model YG6 with a particle size of 50 mesh, the formulation of which is 94% WC, 5% Co, 0.5% Ni, 0.5% Cr, and the hardness after sintering is HRA91;
the second hard alloy particle is a 50-mesh YG10 hard alloy particle, and the formula of the second hard alloy particle is 90% WC, 9% Co, 0.5% Ni and 0.5% Cr, and the hardness of the second hard alloy particle after sintering is HRA88.
4. A method for manufacturing a cemented carbide valve core for a throttle valve according to claim 3, characterized in that in step S2, both cemented carbide particles added are required to have a height exceeding the actual requirement to compensate for the small amount of cemented carbide particles that are inserted into the counterbore of the inner sleeve and extracted from the counterbore of the outer sleeve during S5.
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