Manufacturing method of wear-resistant round roller distributor lining plate

Abstract

The present application relates to the technical field of metallurgical equipment wear resistance, in particular to the processing technology of the lining plate of the circular roller distributor of the sintering machine head material distribution system, in particular to a manufacturing method of a wear-resistant circular roller distributor lining plate. The preparation steps include blanking of the mother plate, positioning tempering, slotting, drilling, bending, special bolt sleeve assembly, mold assembly, pretreatment spraying, surface spraying, surface polishing, laser cutting, mold disassembly and box assembly, etc. The lining plate of the present application adopts Haxdox500 wear-resistant plate as the base plate, slots are formed at the weak positions of the lining plate, WC-50Cr3C2-30NiCr coating is made instead of the traditional stainless steel circular roller distributor lining plate, and the service life of the lining plate is prolonged from less than 8 months to more than 36 months.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgical equipment wear resistance, in particular to the processing technology of the lining plate of the circular roller distributor of the sintering machine head material distribution system, and more particularly to a manufacturing method of a wear-resistant circular roller distributor lining plate. BACKGROUND

[0002] In the sintering production process, iron ore powder, flux, coal powder or coke powder, and returned ore are mixed according to a certain proportion to form a mixture, which is uniformly distributed on the sintering machine trolley through the circular roller distributor and then is roasted.

[0003] The main task of the circular roller distributor is to uniformly and continuously distribute the mixed material to the sintering machine trolley plane in a regular manner. The stability of the circular roller distributor equipment operation and the uniformity of the mixed material surface distribution have a direct impact on the permeability of the mixed material and the yield of the sintered ore. The original circular roller distributor lining plate is not wear-resistant, which will cause unstable discharging on the surface of the lining plate, causing the mixed material on the sintering machine trolley to pile up or interrupt, and resulting in short circuit of the air extraction on the trolley.

[0004] In order to prevent the lining plate surface from sticking material, the current domestic sintering machine circular roller distributor lining plate is made of stainless steel or ceramic lining plate. The traditional stainless steel lining plate has high manufacturing cost, soft hardness, and poor wear resistance, and the service life is generally 6-8 months. If it is not replaced in time, the lining plate will be worn out or rolled up, affecting the sintering segregation distribution and causing the sintered ore quality to fluctuate. The curvature of the ceramic lining plate is not easy to control, and it is easy to be crushed or fall off during operation, affecting the sintering machine distribution. SUMMARY

[0005] The present application provides a manufacturing method of a circular roller distributor lining plate with high hardness and good wear resistance to solve the problem of the current sintering machine circular roller distributor lining plate not being wear-resistant, and more particularly to a manufacturing method of a wear-resistant circular roller distributor lining plate. The lining plate has high hardness and excellent wear resistance, and the manufacturing method is relatively simple.

[0006] The technical scheme adopted by the present application is as follows:

[0007] A manufacturing method of a wear-resistant circular roller distributor lining plate uses Hardox500 wear-resistant plate as a base plate composite plate.

[0008] Further, the manufacturing method of the wear-resistant circular roller distributor lining plate of the present application comprises the following steps:

[0009] (1) Mother plate blanking: Hardox500 wear-resistant plate with δ=20mm is used as the lining plate body, and a flame cutting machine is used to cut according to the drawing size, and the cutting surface burrs are polished and cleaned.

[0010] (2) Positioning tempering: first, the opening position and the opening along the radial direction width of 60mm are tempered, the surface hardness of the opening and the slot position is reduced, and the drilling and slotting processing is prepared.

[0011] (3) Slotting: a shallow slot with a depth of 0.4mm is planed in the tempered area using a planer, and the surrounding burrs are cleaned, so as to prepare for increasing the thickness of the local sprayed layer.

[0012] (4) Drilling: first, a common Φ20mm magnetic drill bit is used for drilling, then a round table-shaped counterbore cutter is used for boring the lining plate, the bottom hole size is Φ24mm, a Φ52mm drill bit is used to expand the upper surface of the counterbore, and if burrs are found, a sander is used to polish them smooth.

[0013] (5) Bending: according to the size of the drawing, under the premise of preferentially ensuring the size of the inner arc, the lining plate is bent by using a plate bender, and after the bending is completed, the drawing size is reviewed, so as to facilitate the installation of one circle every two pieces, and the number of counterbores of each lining plate is 24.

[0014] (6) Special bolt set for matching: the lining plate uses a matching round roller material distributor bolt set, the special-shaped bolt is made of 40Cr forged, and the head is subjected to high-temperature quenching heat treatment.

[0015] (7) Mould installation: the lining plate is installed on the pre-prepared mould, all the bolts are tightly installed in place, and the outer diameter size of the mould is consistent with the surface size of the round roller material distributor body and the bolt positioning size.

[0016] (8) Surface spraying pretreatment: the lining plate and the bolt surface are subjected to oil removal and rust removal pretreatment, and then the surface is subjected to sand blasting.

[0017] (9) Surface spraying: the WC-50Cr3C2-30NiCr coating is prepared on the lining plate surface by using the supersonic flame spraying process, and after the processing is completed, the average thickness of the sprayed layer is not less than 0.2mm, and the thickness around the shallow groove and the bolt hole is not less than 0.6mm.

[0018] (10) Surface polishing: the polishing machine sand belt is used to polish the surface of the lining plate sprayed layer, and the lining plate surface is required to be smooth and the surface roughness is ≤0.8μm.

[0019] (11) Laser cutting: the laser cutting equipment is used to cut the sprayed layer at the joint of the bolt and the lining plate.

[0020] (12) Demoulding and boxing: the round roller lining plate bolt is removed, the lining plate is removed piece by piece, packaged and boxed.

[0021] The characteristics of the present application are:

[0022] The wear-resistant plate used in step (1) is a Hardox500 wear-resistant plate with a diameter of 20 mm, which is produced in Sweden.

[0023] The flame cutting machine used in step (1) is a semi-automatic flame cutting machine.

[0024] In step (6), the bolt head is provided with a straight slot for convenient installation, and the bolt head is subjected to surfacing treatment, so that the bolt realizes a composite structure, and the circumferential position is free of protrusions. In order to prevent the liner bolt from falling off, a M20 alloy AIGI20813 spring pre-tightening disc spring, a M20 hexagonal locking nut and a nut anti-loosening device are used in a matched manner.

[0025] The WC-50Cr3C2-30NiCr coating in step (9) is prepared by using a spraying material with the following components: tungsten carbide WC 20% (wt%), chromium carbide Cr3C2 50%, and nickel-chromium alloy NiCr 30%.

[0026] The preparation method of the spraying material is as follows: the tungsten carbide, chromium carbide and nickel-chromium alloy powders are introduced into a ball mill in the above weight percentages, the ball mill medium is a hard alloy ball and high-purity alcohol, and after ball milling for 24 hours, a uniformly mixed alcohol slurry is obtained; the slurry is input into the rotating spray nozzle in the spray drying tower through a high-pressure pump to form mist droplets, high-temperature nitrogen gas at 70-90 DEG C is introduced into the drying tower, so that the alcohol in the mist droplets is rapidly evaporated, and dry spherical material particles are obtained; the dried spherical material particles are loaded into a graphite box and sent into a sintering furnace at 1400 DEG C with hydrogen protection for sintering for 30-40 minutes, and a WC-50Cr3C2-30NiCr spraying powder material with good sphericity is obtained.

[0027] The preparation method of the WC-50Cr3C2-30NiCr coating in step (9) is as follows: the spraying powder material obtained in the above step is used as a raw material, a JP8000 type HVOF supersonic flame spraying device is used as a coating preparation device, aviation kerosene is used as a main fuel, oxygen is used as a combustion-supporting gas, nitrogen is used as a powder feeding carrier gas, the process parameters are as follows: aviation kerosene 6.2 GPH, oxygen 1920 SCFH, nitrogen 23 SCFH, spraying distance 380 mm, powder feeding speed 45 g / min, and tube length 6 cm.

[0028] The beneficial effects of the present application are as follows:

[0029] By changing the thickness of the mother plate and increasing the local thickness of the wear-resistant layer, the strength of the surrounding part of the bolt hole of the original liner plate is strengthened, and the overall service life of the liner plate is prolonged.

[0030] The surface of the liner plate is polished by a polishing machine sand belt, and the surface roughness is less than or equal to 0.8 microns, so that the surface of the liner plate is smooth and does not stick to the material due to the stickiness of the uniformly mixed material.

[0031] The WC-50Cr3C2-30NiCr coating used in this invention has high hardness and density, thus possessing excellent wear resistance and corrosion resistance. Its manufacturing cost and production efficiency are superior to those of the WC-10Co-4Cr coating.

[0032] Because the NiCr binder phase in this powder has a mass fraction of 30%, higher than the CoC binder phase mass fraction of 16% in the WC-10Co-4Cr powder, the higher binder phase ratio can better encapsulate the carbide particles in the powder, reducing unmelted carbides during high-speed deposition. Due to the high deposition rate of the WC-50Cr3C2-30NiCr powder, production efficiency is also improved, resulting in a lower preparation cost for the WC-50Cr3C2-30NiCr coating compared to the WC-10Co-4Cr coating.

[0033] In summary, the liner prepared by this invention uses Haxdox 500 wear-resistant steel plate as the base material, grooves are cut into the weak areas of the liner, and a WC-50Cr3C2-30NiCr coating is applied to replace the traditional stainless steel circular roller feeder liner. The service life of the liner is extended from less than 8 months to over 36 months, more than 4.5 times the original lifespan. This liner manufacturing method is simple and easy to install, avoiding fluctuations in the lateral feeding of the sintering machine trolley due to inconsistent axial wear of the liner over a long period, which affects the quality of the sinter. Furthermore, it has a long service life and low economic cost, saving on labor replacement costs and economic investment, thus demonstrating good economic and social benefits. Attached Figure Description

[0034] Fig. 1 This is an unfolded view of the roller feeder liner of the present invention.

[0035] Fig. 2 This is a partial view of the roller feeder liner of the present invention.

[0036] Fig. 3 This is a partial assembly drawing of the roller feeder liner.

[0037] Among them, 1. Liner body; 2. Shallow groove; 3. Liner countersunk hole; 4. WC-50Cr3C2-30NiCr coating; 6. Alloy stamping pre-tightened disc spring; 7. Hexagonal lock nut; 8. Nut anti-loosening device; 9. Bolt. Detailed Implementation

[0038] The technical solution of the present invention will be described in detail below with reference to specific embodiments.

[0039] Example 1

[0040] Combination Figs. 1 to 3It can be seen that the round roller distributor liner plate of the application,

[0041] A manufacturing method of a wear-resistant round roller distributor liner plate, steps include:

[0042] (1) blanking of the mother plate: adopt the original imported δ=20mm Hardox500 wear-resistant plate produced in Sweden as the liner plate body 1, use a semi-automatic flame cutting machine to blank according to the drawing size, and polish and clean the burrs on the cutting surface.

[0043] (2) positioning annealing: considering the bolt hole position of the circular arc development surface and the weak position prone to wear during the operation of the liner plate, first anneal the hole position and the width of 60mm in the radial direction, reduce the surface hardness of the hole and the slot position, and prepare for drilling and slotting processing.

[0044] (3) slotting: use a planer to plane a 0.4mm deep slot 2 in the annealed area, and clean the burrs around it to prepare for increasing the thickness of the local sprayed layer.

[0045] (4) drilling: first drill using a common Φ20mm magnetic drill bit, then bore the liner plate using a round-tapered counterbore cutter, the bottom hole size is Φ24mm, use a Φ52mm drill bit to expand the upper surface of the counterbore, and if burrs are found, polish them smooth using a sander.

[0046] (5) bending: according to the drawing size, under the premise of preferentially ensuring the inner arc size, use a plate bender to bend the liner plate, recheck the drawing size after bending is completed, splice one circle by every two pieces for easy installation, and the number of counterbores 3 in each liner plate is 24.

[0047] (6) special bolt set for matching: design a bolt set for matching the round roller distributor liner plate, the special-shaped bolt is made of 40Cr forged and the head is high-temperature quenched and heat treated.

[0048] For easy installation, the bolt head is designed as a straight slot, the bolt head is subjected to surfacing treatment, the bolt is realized as a composite structure bolt, the circumferential direction position is ensured without protrusion, M20 AIGI20813 alloy stamping pre-tightening disc spring 6 and M20 hexagonal locking nut 7 and nut anti-loose device are used in matching to prevent the liner plate bolt from falling off.

[0049] (7) mold mounting: mount the liner plate to the pre-prepared mold, all bolts 9 are fully installed and fastened in place, the mold outer diameter size is consistent with the liner plate body surface size and the bolt positioning size.

[0050] (8) pretreatment for spraying: pretreat the surface of the liner plate and the bolt for oil removal and rust removal, and then sandblast the surface.

[0051] (9) Surface spraying: using supersonic flame spraying process to prepare WC-50Cr3C2-30NiCr coating 4 on the surface of the lining plate. After processing, the average thickness of the coating is not less than 0.2 mm, and the thickness around the groove and bolt hole is not less than 0.6 mm, so as to strengthen the local position.

[0052] (10) Surface polishing: using polishing machine sand belt to polish the surface of the lining plate, and the surface roughness of the lining plate is required to be ≤0.8 μm.

[0053] (11) Laser cutting: using laser cutting equipment to accurately position and cut the spraying layer at the joint of the bolt and the lining plate to ensure the separation of the bolt and the lining plate.

[0054] (12) Demolding and boxing: the round roller lining plate bolt is taken off from the mold, the lining plate is taken off piece by piece, packed and boxed, and used as a sintering machine maintenance spare part.

Claims

1. A method for manufacturing a wear-resistant circular roller fabric feeder liner, characterized in that, Use Hardox500 wear plate as substrate composite plate The steps include: (1) blanking of the base plate: adopt Hardox500 wear plate with δ=20mm as the lining plate body, use a flame cutting machine to blank according to the drawing size, and polish and clean the cutting surface burrs; (2) positioning tempering: first, temper the hole position and the radial direction width of 60mm along the hole to reduce the surface hardness of the hole and the slot position, and prepare for drilling and slotting processing; (3) slotting: use a planer to plane a 0.4mm deep slot in the tempered area, and clean the surrounding burrs to prepare for increasing the thickness of the local sprayed layer; (4) drilling: first, drill using a common Φ20mm magnetic drill bit, then use a reverse cone-shaped counterbore tool to bore the lining plate, the bottom hole size is Φ24mm, use a Φ52mm drill bit to expand the upper surface of the counterbore, and if burrs are found, polish them smooth using a sander; (5) bending: according to the drawing size, under the premise of preferentially ensuring the inner arc size, use a plate bender to bend the lining plate, after bending, recheck the drawing size, splice one circle every two pieces, and the number of counterbores for each lining plate is 24; (6) make special bolt sets: use a matching round roller material distributor lining plate bolt set, special-shaped bolts are made of 40Cr forged, and the head is high-temperature quenched and heat treated; (7) mold loading: load the lining plate into the pre-prepared mold, and all bolts are fully installed and fastened in place, the mold outer diameter size is consistent with the round roller material distributor body surface size and bolt positioning size; (8) surface spraying pretreatment: pretreat the lining plate and bolt surface to remove oil and rust, and then sandblast the surface; (9) surface spraying: use supersonic flame spraying process to prepare WC-50Cr3C2-30NiCr coating on the lining plate surface, after processing, the average thickness of the sprayed layer is not less than 0.2mm, and the thickness around the shallow groove and bolt hole is not less than 0.6mm; (10) surface polishing: use a polishing machine sand belt to polish the lining plate sprayed layer surface, and the lining plate surface is required to be smooth and the surface roughness is ≤0.8μm; (11) laser cutting: use laser cutting equipment to cut the sprayed layer at the joint of the bolt and the lining plate; (12) mold unloading and packaging: unload the round roller lining plate bolt, unload the lining plate piece by piece, package and pack; Step (6): the bolt head adopts a straight slot, the bolt head is subjected to surfacing treatment, the bolt realizes a composite structure, and at the same time, the position in the circumferential direction is free of protrusions, and M20 AIGI20813 alloy stamping pre-tightening disc springs, M20 hexagonal locking nuts and nut anti-loose devices are used in matching.

2. The method of claim 1, wherein the wear plate is made of a material selected from the group consisting of: a high chromium white cast iron, a high chromium ductile iron, a high chromium compacted graphite iron, a high chromium alloyed steel, and a high chromium stainless steel. The wear plate used in step (1) is δ=20mm Hardox500 wear plate produced in Sweden.

3. The method of claim 1, wherein the wear plate is made of a material selected from the group consisting of: a high chromium white cast iron, a high chromium ductile iron, a high chromium compacted graphite iron, a high chromium alloy steel, and a high chromium stainless steel. The flame cutting machine used in step (1) is a semi-automatic flame cutting machine.

4. The method for manufacturing the wear-resistant circular roller feeder liner according to claim 1, characterized in that, The WC-50Cr3C2-30NiCr coating in step (9) uses spraying material with the following composition: tungsten carbide WC 20% (weight percentage), chromium carbide Cr3C2 50%, and nickel-chromium alloy NiCr 30%.

5. The method of claim 4, wherein the wear plate is made of a material selected from the group consisting of: a high chromium white cast iron, a high chromium ductile iron, a high chromium compacted graphite iron, a high chromium alloyed steel, and a high chromium stainless steel. The preparation method of the spraying material is as follows: the tungsten carbide, chromium carbide and nickel-chromium alloy powder is introduced into a ball mill in the above weight percentage, the ball mill medium is hard alloy ball and high-purity alcohol, and the mixed alcohol slurry is obtained after ball milling for 24 hours; the slurry is input into the rotating spray nozzle in the spray drying tower through a high-pressure pump to form mist droplets, high-temperature nitrogen gas of 70-90℃ is introduced into the drying tower, so that the alcohol in the mist droplets is rapidly evaporated, and dry spherical material particles are obtained; the dried material spherical particles are loaded into a graphite box and sent into a sintering furnace with hydrogen protection at 1400℃ for sintering for 30-40 minutes, and a WC-50Cr3C2-30NiCr spraying powder material with good sphericity is obtained.

6. The method of claim 1, wherein the wear plate is made of a material selected from the group consisting of: steel, stainless steel, and a combination thereof. The preparation method of the WC-50Cr3C2-30NiCr coating in step (9) is as follows: the spraying powder material obtained in the above step is used as raw material, JP8000 type HVOF supersonic flame spraying is used as the coating preparation equipment, aviation kerosene is used as the main fuel, oxygen is used as the combustion-supporting gas, nitrogen is used as the powder feeding carrier gas, the process parameters are as follows: aviation kerosene 6.2 GPH, oxygen 1920 SCFH, nitrogen 23 SCFH, spraying distance 380 mm, powder feeding speed 45 g / min, and tube length 6 cm.

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