CN105499504B - A process of lost foam casting wear-resistant parts - Google Patents

Abstract

The invention discloses a process for casting a wear-resistant part by using a lost foam, and belongs to the field of lost foam casting processes. The process for casting the wear-resistant part by using the lost foam comprises the following steps of ST 1: the white mold comprises a cross gate, an inner gate and a casting lost foam; step ST2, assembling the white mold: vertically arranging the two cross runners to enable the inserting grooves on the two cross runners to be opposite to each other, enabling the casting lost foam to be located between the two cross runners, and enabling the ingates on two sides of the casting lost foam to be respectively matched with the cross runners on the corresponding sides to obtain a white mould assembly; step ST3, preparing a coating; step ST4, brushing paint; step ST5, dip coating; step ST6, modeling; step ST7, casting; ST8, recycling molding sand; ST9, cleaning castings; step ST10, heat treatment. The invention mainly realizes the function of improving the casting quality of the wear-resistant part.

Description

A process of lost foam casting wear-resistant parts

technical field

The invention relates to a process of lost foam casting, more specifically, to a process of lost foam casting of wear-resistant parts.

Background technique

The lost foam casting technology is to bond and combine foamed plastic models with the same size and shape as the castings to form a model cluster, brush the refractory coating and dry it, bury it in dry quartz sand for vibration molding, and pour liquid metal under certain conditions. The method of vaporizing the model and occupying the position of the model, solidifying and cooling to form the required casting. Compared with the traditional casting technology, due to the use of highly gasified foam plastics to make the model, there is no need to take the mold and make the mold core, and there is no parting surface, so there is no flash or burr. This process completely abandons the traditional process. The unfavorable factors of large pollutant discharge and high labor intensity of workers in the working process realize a clean production with simple process, high efficiency and almost pollution-free.

In the field of lost foam casting, runners and inner runners are needed in the casting process. The inner runners are connected to the lost foam of castings and used to drain liquid metal into the lost foam of castings to form castings; runners are used for Connect multiple castings with lost foam, so that multiple castings can be cast in one pour. However, in order to save trouble, the manufacturers of the lost foam casting process in the prior art often purchase the foam sheet separately and cut it to form the runner, so that the runner and the inner runner are split, and the runner and the inner runner need to be separated before casting. The sprue is glued together by glue, which is laborious and invisibly increases the production cost, and the runner and the inrunner are often not bonded firmly. It is easy to fall off, which reduces the casting quality. At the same time, the runner is generally a rectangular long plate, which is not conducive to the flow of liquid metal. Secondly, in the prior art, the inrunner is often designed as a small rectangular block connected to the lost foam of the casting. When cleaning the formed casting after pouring, it is necessary to knock out the solidification of the inrunner connected to the casting. , grinding, but because the solidification of the inner runner and the casting body are co-shaped during pouring, it often results in knocking out the solidification of the inner runner during the solidification process, either the solidification of the inner runner leaves a section on the casting body that is difficult to remove, or the casting The part near the connection between the main body and the ingate solidification is also knocked off, which is not only time-consuming and labor-intensive, but also seriously affects the quality of the casting and increases the defective rate of the casting.

Regarding the lost foam casting process, related technical solutions have been disclosed in the prior art, such as patent publication number: CN104690225A, publication date: June 10, 2015, and the name of the invention is: a lost foam casting process with good mechanical properties of castings , the application discloses a lost foam casting process with good mechanical properties of castings, which includes the following steps: using foaming materials to form the main parts in blocks, and bonding the made main parts to make the lost foam of the casting; Bond the sprue for the lost foam of the casting, and coat the refractory material on the outside of the lost foam of the casting and the sprue to make the final model; put the final model into the sand box, fill it with dry sand, and vibrate it with a three-dimensional vibrating table. The sand box is covered with plastic film; the negative pressure air flow is evenly introduced into the sand box from top to bottom until the negative pressure reaches -0.04～-0.08MPa. The negative pressure air flow uses a mixed gas of oxygen, nitrogen, and carbon dioxide; the molten The metal is poured into the sand box corresponding to the area where the final model is located, the final model gasifies and disappears, the metal replaces the final model, and the casting is obtained after cooling. However, in this application, the lost foam of the casting and the runner are also bonded together by glue, and there are still problems affecting the time of forming the mold and the quality of casting.

The process of lost foam casting process includes white area, black area and yellow area process. In the existing lost foam casting technology, the black area is the process of sand treatment. After the used sand well sand treatment system is screened, dust removed, etc. After treatment, it can be regenerated and reused. Its main functions are: screening out impurities in the molding sand (sand blocks, iron slag, paint dust and other sundries), cooling, conveying and storing the molding sand. From the perspective of the lost foam casting process and equipment requirements, it is inevitable that the dry sand will be broken and pulverized during the molding process and circulation process. At the same time, the decomposed paint dust during the casting process will also be mixed into it, which will deteriorate the performance of the molding sand. Reduce the air permeability and consume more binder, so it is necessary to remove the dust formed by the crushing and pulverization of the molding sand and the decomposition of the coating. In addition, the initial temperature of the molding sand after demoulding is very high, usually 200-500°C. In the production of lost foam, when the sand temperature is too high, the film will be scalded or warped during the molding process. Therefore, before molding, the sand temperature It should be controlled below 55°C as much as possible before it can be reused, so efficient cooling equipment is needed to achieve it. Therefore, the lost foam casting process without a sand treatment system is difficult to show the excellent characteristics of the lost foam casting production environment and ensure the stability of product quality. A sand treatment system is generally configured in the existing lost foam casting process, but the existing sand treatment system often has a complex structure and high manufacturing and operating costs.

After retrieval, the application publication number: CN 103909216 A, publication date: July 9, 2014, the name of the invention is: a sand processing system for lost foam casting production line, the application discloses a lost foam sand processing system, including Shaking sand cleaning system, ash removal cooling system, sand selection system, sand conveying system, central sand warehouse, intermediate sand warehouse, sand filling molding system, dust removal system, control system, sand conveying system consists of four conveying devices, sand falling cleaning The system is connected to the intermediate sand warehouse through the first conveying device, the intermediate sand warehouse is connected to the ash removal cooling system through the second conveying device, the ash removal cooling system is connected to the sand selection system through the third conveying device, and the sand selection system is connected through the fourth The conveying device is respectively connected with the central sand storage and sand filling molding system, the dust removal system and control system are connected with the falling sand cleaning system, ash removal cooling system, sand selection system, sand conveying system, central sand storage, intermediate sand storage, sand filling molding system, connected separately. However, the sand treatment system of this application has a complex structure and high manufacturing and operating costs.

The mixer is widely used, and can be used in the field of construction, environmental protection, etc. The essential components of the mixer include scrapers and stirring blades (the mixing blades generally include side blades and middle blades used in combination), which play an important role in the mixer. Function, scrapers and stirring blades are generally manufactured by lost foam casting process and used as wear-resistant parts. In engineering applications, because the existing scraper and mixing blade have great resistance to mixing with the concrete during the concrete mixing process, there will be a lot of wear and tear during work, especially on the scraper and mixing blade. At the installation hole, the bolts in the installation hole will be damaged. In actual engineering applications, it is often easy to cause the scraper and stirring blade to be installed insecurely or even fall off directly, which reduces the service life of the scraper and stirring blade, thereby increasing the wear-resistant parts. loss.

After retrieval, Chinese patent application number: 2010201484235, publication date: December 1, 2010, the name of the invention is: a scraper, the application discloses a scraper, including a scraper body, one end of the scraper body is provided with a scraper mouth , the other end is provided with a knife handle, the outer surface of the scraper mouth is welded with a layer of composite chromium carbide and niobium carbide alloy, the scraper mouth is completely wrapped in the alloy layer, the scraper body and both sides of the knife handle are welded with a grid-like alloy, the grid The metal-shaped alloy and the alloy of the scraper edge are connected to each other, and the material of the scraper body is manganese steel or ordinary carbon steel; compared with the prior art, this application uses manganese steel or ordinary carbon steel as the substrate of the scraper, and welds composite carbonization on the surface of the substrate. Chromium and niobium carbide alloys are used as the wear-resistant layer, which improves the wear resistance of the traditional cast scraper by 2 to 3 times and prolongs the service life of the scraper. However, the through hole on the surface of the handle in this application is still easy to wear and tear It will lead to accidents such as the scraper is not installed firmly or falls off from the stirring arm, which reduces the service life of the scraper and increases the wear and tear of the wear parts.

Chinese patent application number: 2010206563252, publication date: August 24, 2011, the name of the invention is: mixing blade of concrete mixer, the application discloses a mixing blade of concrete mixer, including a T-shaped blade, on the blade There are two strip-shaped slideways, installation holes are respectively arranged between the two strip-shaped slideways, and grooves are respectively arranged on the outer sides of the two strip-shaped slideways. The stirring blade of the application has reasonable structural design, light weight, convenient installation with other parts, and improves stirring efficiency. However, the mounting holes provided between the two strip-shaped slides in this application are still easy to be worn and worn, which will lead to accidents such as the installation of the stirring blades is not firm or directly falls off, reducing the service life of the stirring blades, thereby increasing The loss of wear parts is reduced.

Contents of the invention

1. The technical problem to be solved by the invention

The purpose of the present invention is to overcome the above-mentioned shortcomings in the prior art, and provide a process for casting wear-resistant parts by lost foam, which mainly realizes the function of improving the casting quality of wear-resistant parts.

2. Technical solution

In order to achieve the above object, the technical scheme provided by the invention is:

The process of the lost foam casting wear-resistant part of the present invention comprises the following steps,

Step ST1, preparing a white mold;

Using expandable polystyrene as the raw material, put the raw material into the pre-foaming machine, and let steam at 70-100°C for 2-5 minutes for pre-foaming, so that the volume of the foam obtained after pre-foaming increases to the pre-foaming 5-10 times of that before foaming;

Use compressed air to flush the foam obtained after pre-foaming into the mold, pass steam at 50-100°C into the mold, and foam to obtain a white mold;

Pass cooling water into the mold from top to bottom, open the upper mold of the mold after the mold is cooled, and then pass compressed air into the mold from bottom to top, and eject the white mold from the mold;

Wherein, the white mold includes runner, inner runner and casting lost mold.

Step ST2, assembling the white mold;

Step ST3, preparing coating;

Step ST4, brush paint;

Step ST5, dipping paint;

Step ST6, modeling;

Step ST7, pouring;

Step ST8, molding sand recycling;

Step ST9, casting cleaning;

Step ST10, heat treatment.

As a further improvement of the present invention, in the white mold prepared in step ST1, the runner is in the shape of a long strip, the runner includes a runner main body, and the upper middle of the runner main body is provided with drainage ribs along the length direction , the upper part of the main body of the runner is also provided with a number of insertion grooves at equal intervals along the length direction, and the two sides of the drainage rib are symmetrically provided with weight-reducing grooves;

The lost foam of the casting and the inner runner are integrally formed, and the two sides of the lost foam of the casting are symmetrically provided with the inner runner, and the inner runner includes a drainage block and a plug-in block, and the drainage block and the plug-in block are perpendicular to each other Together they form an L-shaped structure, the thickness of the drainage block is smaller than the thickness of the insertion block, the drainage block is fixedly connected with the lost foam of the casting, and the insertion block is used to cooperate with the above-mentioned insertion groove;

The junction of the weight-reducing groove and the insertion groove adopts a circular arc transition; the upper part of the runner main body is provided with 3 to 8 insertion grooves at equal intervals along the length direction; the thickness of the drainage block is the thickness of the insertion block 1/4~1/2 of the thickness;

The length direction of the insertion groove is parallel to the width direction of the main body of the runner, and the insertion groove is composed of two side walls and a rear wall; the drainage block and the insertion block are both rectangular blocks, and the insertion groove is an open end rectangular slot;

The width of the plug-in block is equal to the width of the drainage block, the width of the plug-in block is 2-3mm greater than the width of the plug-in slot, and the thickness of the plug-in block is equal to the depth of the plug-in slot;

The two sides of one end of the drainage rib are provided with connecting blocks, and the connecting block connects the side surface of the end of the drainage rib with the main body of the runner.

As a further improvement of the present invention, in step ST2, the two runners are vertically arranged so that the insertion grooves on the two runners are facing each other, and 3 to 8 lost foam castings are located between the two runners The distance between the lost foams of adjacent castings is at least 5 mm, and the inrunners on both sides of the lost foams of the castings are respectively matched with the runners on the corresponding sides to obtain a white mold assembly.

As a further improvement of the present invention, in step ST3, the refractory aggregate, organic binder, anhydrous binder, suspending agent, thickening stabilizer, defoamer and preservative are evenly mixed to obtain a coating, wherein: refractory Aggregate accounts for 17-18% of the total mass of the coating. The refractory aggregate is a mixture of brown corundum powder and quartz powder. The particle diameters of the brown corundum powder and quartz powder are both above 300 mesh; the organic binder is carboxymethyl fiber A mixture of plain sodium and white latex, the sodium carboxymethyl cellulose accounts for 0.2 to 0.6% of the total mass of the paint, the white latex accounts for 3 to 6% of the total mass of the paint, and the white latex contains 20% by mass of poly Vinyl alcohol; the anhydrous binder is silica sol, and the silica sol accounts for 3-8% of the total mass of the paint; the suspending agent is sodium-based bentonite, and the sodium-based bentonite accounts for 1-4% of the total mass of the paint; the thickening is stable The agent is polyacrylamide, and the polyacrylamide accounts for 0.1-0.2% of the total mass of the paint.

As a further improvement of the present invention, in step ST4, brush a layer of paint with a thickness of 2 to 3 mm on the surface of all grooves and through holes on the lost foam of the casting with a brush, and dry it;

In step ST5, the white mold assembly is prepared, and the runners vertically arranged on both sides of the lost foam of the casting are respectively tied to the arms on both sides of the fixing frame by ropes. The fixing frame is a rectangular frame; Immerse in the coating pool, take out the fixing frame and dry; then immerse the fixing frame as a whole in the coating pool, take out the fixing frame and dry again;

In step ST6, first lay a layer of molding sand on the bottom of the sand box, use a three-dimensional vibrating table to vibrate and level off, remove the white mold assembly from the fixing frame, and then hang the white mold assembly into the sand box In the middle part, sand is added to the lower sand box through the sand bed at a constant speed and the sand box is vibrated. The amplitude of the sand box is 0.2-0.4mm. Stop adding sand when the molding sand is 10-20mm away from the upper mouth of the sand box. Stop adding sand for 30~ Stop the vibration after 45s, then lay a plastic film on the top of the sand box, cover the plastic film with dry sand, place the sprue cup, and wait for pouring;

In step ST7, the pouring temperature is controlled at 1350-1400°C, and the negative pressure in the sand box is controlled to be 0.015-0.025 MPa during pouring, and the vacuum is removed after 6-7 minutes after pouring;

In step ST9, the molding sand on the surface of the casting is removed, and the solidified ingate solidified on both sides of the casting is knocked off and polished.

As a further improvement of the present invention, in step ST8, the sand processing system is used to recover the molding sand, the sand box is moved to the fence and turned over, the casting is intercepted by the fence, and the molding sand falls to the upper vibrating screen plate through the through hole on the fence, With the vibration of the upper vibrating sieve plate, the molding sand with qualified size falls into the lower vibrating sieve plate through the through holes on the upper vibrating sieve plate, and the impurities and unqualified molding sand are left on the upper vibrating sieve plate; the lower vibrating sieve plate The molding sand on the top is lifted to the entrance of the cooling cylinder by the first hoist, and undergoes magnetic separation treatment at the entrance of the cooling cylinder. After the magnetic separation treatment, the molding sand enters the cooling cylinder to cool and remove dust. The cooled and dust-removed molding sand passes through the second The hoist and conveyor belt are transported to each sand bed to complete the molding sand recycling process;

Wherein, the sand treatment system includes a fence, a vibrating screen, a first hoist, a cooling cylinder, a dust hood, a second hoist, a conveyor belt, a sand bed, and a sand box, and a vibrating screen is arranged below the fence. The sieve includes an upper vibrating sieve plate and a lower vibrating sieve plate connected to the vibrating motor, and the upper vibrating sieve plate and the lower vibrating sieve plate are arranged in parallel; Both ends of the vibrating sieve plate are provided with a baffle plate; one end of the lower vibrating sieve plate is provided with a baffle plate, and the other end is inclined downward in the direction of the first elevator; the first elevator is located on one side of the lower vibrating sieve plate, The first hoist is used to lift the molding sand flowing down from the lower vibrating sieve plate to the inlet of the cooling cylinder, and a dust cover is provided above the outlet of the cooling cylinder; the second hoist is located on the side of the outlet of the cooling cylinder, and the first The second hoist is used to lift the molding sand flowing down from the outlet of the cooling cylinder to the conveyor belt; the conveyor belt is located above at least three sand beds, and the conveyor belt is used to transport the molding sand into the sand bed, and a sand bed is arranged below the sand bed. box;

The sand processing system also includes a vacuum distributor, the vacuum distributor is provided with a plurality of inlets, and the inlets are connected to the vacuum port on the sand box through pipelines; the vacuum distributor is connected to the vacuum equipment;

A magnetic separator is provided at the entrance of the cooling cylinder, and the magnetic separator is used for magnetically separating the molding sand entering the cooling cylinder;

The bottom surface of the cooling cylinder is respectively connected with three air supply pipes, and the above three air supply pipes are equally spaced along the length direction of the cooling cylinder and are all connected with the air outlet of the high-pressure fan; the inner wall of the cooling cylinder is surrounded by Cooling water coil, a spiral cooling water pipe is erected at the central axis inside the cooling cylinder;

Above the fence, above the vibrating screen, and above each sand bed, a dust suction cover is arranged;

The dust collection hoods are all connected with the dust removal equipment. The dust removal equipment includes a cyclone dust collector, a bag filter and a dust removal fan. Connected with the dust removal fan;

The included angle between the lower vibrating sieve plate and the horizontal plane is 4-5°;

The diameter of the through hole on the upper vibrating sieve plate gradually decreases from one end to the other end where the first elevator is located;

There is a track for the sand box to slide between the bottom of each sand bed and the fence;

A three-dimensional vibrating table is provided below each sand bed.

As a further improvement of the present invention, in step ST10, the casting is put into the heating furnace, heated to 945-950°C at a constant speed for 4.5-5 hours, then kept for 2-3 hours, and then cooled to 860-865°C after 1-2 hours, Out of the furnace, it is air-cooled. During air cooling, the casting is placed on a vibrating table to vibrate, and the air is blown to the vibrating table along the horizontal direction. The surface of the vibrating table is evenly distributed with through holes, and the vibration height of the casting is 15-25mm.

In the process of casting wear-resistant parts for scrapers using the above-mentioned technology for casting wear-resistant parts of lost foam of the present invention, in the white mold prepared in step ST1, the lost foam of the casting is a lost foam of a scraper, and the lost foam of a scraper includes a scraper body and a scraper The scraper mouth is located on one side of the scraper body, and two scraper installation holes are symmetrically arranged on the scraper body. The scraper installation holes are waist-shaped holes; there is a wear-resistant protective layer around the scraper installation hole. The wear-resistant protective layer is higher than the upper surface of the scraper body, and the connection between the wear-resistant protective layer and the scraper body adopts a circular arc transition;

The outer surface of the scraper mouth includes a first inclined surface, a second inclined surface, a third inclined surface and a fourth inclined surface, the first inclined surface is the upper surface of the scraper mouth, the first inclined surface is upwardly inclined, and the second inclined surface The inclined surface is connected with the first inclined surface, and the second inclined surface is inclined downward, the fourth inclined surface is the lower surface of the scraper mouth, and the third inclined surface connects the second inclined surface with the fourth inclined surface;

The front and rear ends of the scraper body are symmetrically provided with scraper weight-reducing grooves;

The included angle between the first inclined surface and the horizontal line is 30-35°, the included angle between the second inclined surface and the vertical line is 50-55°; the wear-resistant protective layer is 5-6mm higher than the upper surface of the scraper blade .

In the process of casting the wear-resistant part of the side blade by using the above-mentioned process of casting the wear-resistant part of the lost foam casting of the present invention, in the white mold prepared in step ST1, the lost foam of the casting is the lost foam of the side blade, and the lost foam of the side blade includes the side blade The body, the first use part and the second use part, the first use part and the second use part are respectively located on two adjacent side surfaces of the side blade body, and the second use part is higher than the upper surface of the side blade body , the outer wall of the second use part is a curved surface; two side blade installation holes are arranged symmetrically front and back on the side blade body, and the side blade installation holes are waist-shaped holes; a layer of side blade resistance is provided around the side blade installation hole Wear protection layer, the side blade wear protection layer is higher than the upper surface of the side blade body, and the connection between the side blade wear protection layer and the side blade body adopts a circular arc transition;

The outer surface of the first use portion includes a first inclined surface of the side vane, a second inclined surface of the side vane, a third inclined surface of the side vane and a fourth inclined surface of the side vane, and the first inclined surface of the side vane is the first inclined surface of the side vane. The upper surface of the part, the first inclined surface of the side vane is inclined downward, the fourth inclined surface of the side vane is the lower surface of the first use part, the fourth inclined surface of the side vane is inclined downward, the third inclined surface of the side vane is inclined to the fourth inclined surface of the side vane The surfaces are connected, and the third inclined surface of the side blade is inclined upward, and the second inclined surface of the side blade connects the third inclined surface of the side blade with the first inclined surface of the side blade;

The side of the side blade body that is not the first use part and the second use part is provided with a weight-reducing gap; the side blade body is provided with a baffle, which is higher than the upper surface of the side blade body, and the baffle Set opposite to the second use part;

The angle between the third inclined surface of the side blade and the horizontal line is 50-55°, the angle between the second inclined surface of the side blade and the third inclined surface of the side blade is 90°; the wear-resistant protective layer of the side blade is high The upper surface of the blade body on the outlet side is 5-6mm.

In the process of casting the wear-resistant part of the middle blade by using the above-mentioned process of casting the wear-resistant part of the lost foam of the present invention, in the white mold prepared in step ST1, the lost foam of the casting is the lost foam of the middle blade, and the lost foam of the middle blade includes the middle blade The body and the use part, the middle blade body is a T-shaped structure, the use part is provided on the rear side of the middle blade body, the use part is higher than the upper surface of the middle blade body, and the connection between the use part and the middle blade body is Arc transition; two middle blade installation holes are arranged symmetrically front and back on the middle blade body, and the middle blade installation holes are circular holes; a layer of middle blade wear-resistant protective layer is provided around the middle blade installation hole, and the middle blade is durable The wear protection layer is higher than the upper surface of the middle blade body, and the connection between the wear protection layer of the middle blade and the middle blade body adopts a circular arc transition;

Both the upper surface and the lower surface of the front part of the middle blade body are inclined between the two, and the angle between the upper surface and the lower surface of the front part of the middle blade body is α;

The α is 10-11°; the wear-resistant protective layer of the middle blade is 5-6mm higher than the upper surface of the side blade body;

Two weight-reducing grooves of the middle blade are symmetrically arranged on the body of the middle blade.

3. Beneficial effect

Compared with the prior art, the technical solution provided by the invention has the following remarkable effects:

(1) The sand treatment system in the present invention has ingenious structural design, lower manufacturing and operating costs, and mainly includes the following beneficial effects:

1) The upper vibrating sieve plate and the lower vibrating sieve plate are inclined. After the molding sand to be processed falls on the upper vibrating sieve plate, it moves slowly towards the direction of the first elevator under the action of vibration. Spread out to avoid the problem that the filtering efficiency of the upper vibrating sieve plate is affected because the molding sand is always accumulated directly under the fence, and the large particles of impurities and unqualified molding sand are automatically sent to the baffle on the upper vibrating sieve plate, which is convenient centralized recycling;

2) The cooling water coil and the spiral cooling water pipe enclose the molding sand together, so that the molding sand can be fully exchanged when blown in any direction in the cooling cylinder, which greatly improves the cooling effect of the cooling cylinder;

3) In order to improve the working environment on site and avoid dust pollution, a dust collection cover is installed above the fence, vibrating screen and each sand bed to remove dust in the air;

4) Dust removal equipment includes cyclone dust collector, bag filter and dust removal fan. The dust removal fan provides suction. The dusty air absorbed in the dust collection hood first passes through the cyclone dust collector to remove large particles of dust, and at the same time avoids large particles of dust on the bag dust collector. The wear of the bag on the filter protects the bag; then the small particles of dust are removed by the bag filter, and the air after dust removal is finally discharged by the dust removal fan. The dust removal equipment adopts two-stage dust removal, and the dust removal effect is better;

5) On the upper vibrating sieve plate, the closer to the direction of the first hoist, the longer the material is vibrated on it. Therefore, the closer to the direction of the first hoist on the upper vibrating sieve plate, the larger particles Impurities and unqualified molding sand are more likely to be crushed into small particles and fall into the lower vibrating sieve plate below. In the present invention, the through hole on the upper vibrating sieve plate is directed from one end to the direction of the first elevator. The other end is designed to be gradually reduced, which can effectively avoid the above-mentioned problems.

(2) In the present invention, through the cooperation of the plug-in block and the plug-in groove, a plurality of lost foam castings can be conveniently installed between two runners at equal intervals, and a plurality of lost foam castings can be poured at one time, which improves the Productivity.

(3) The coating prepared in the present invention has low cost and can be firmly bonded on the surface of the white mold assembly. Compared with the coating used in the prior art, the coating in the invention is adopted, so that the coating layer of the finished casting is once The percentage of permanent shedding is further increased, the surface of the casting is smooth after molding, and the qualified rate of the finished casting is also significantly increased.

(4) In the present invention, in step ST4, use a brush to brush a layer of 2-3 mm thick paint on all the groove surfaces and through-hole surfaces on the lost foam of the casting, which can slow down the formation of the grooves and through holes on the lost foam of the casting. The coagulation speed of the molten iron keeps the coagulation speed of the molten iron in the grooves and through holes on the lost foam of the casting synchronized with the coagulation speed of the molten iron in other places on the lost foam of the casting during pouring, effectively eliminating the internal stress formed inside the casting after the casting is formed.

(5) In the present invention, the casting is placed on a vibrating table for vibration air quenching, and the casting can leave the vibrating table during air quenching, so that the entire outer surface of the casting is uniformly quenched, which can solve the uneven quenching that exists in the current wear-resistant castings during air quenching question.

(6) The technology of the lost foam casting wear-resistant part of the present invention can greatly improve the casting quality of the wear-resistant part, and the one-time qualified rate of the casting product reaches about 98%.

Description of drawings

Fig. 1 is the front view structural representation of runner in the present invention;

Fig. 2 is the top view structural representation of runner in the present invention;

Fig. 3 is the schematic diagram of the front view structure of the white mold assembly bound on the fixing frame in the present invention;

Fig. 4 is a top view structural schematic diagram of the scraper lost foam in the present invention;

Fig. 5 is a schematic diagram of the front view structure of the scraper lost foam in the present invention;

Fig. 6 is a schematic diagram of the structure of the left view at place A in Fig. 4;

Fig. 7 is a top view structural schematic diagram of the lost mode of the side blade in the present invention;

Fig. 8 is a schematic diagram of the left view structure at B in Fig. 7;

Fig. 9 is a schematic diagram of the front structure of the lost mode of the side blade in the present invention;

Fig. 10 is a top view structural schematic diagram of the lost mode of the middle blade in the present invention;

Fig. 11 is a schematic diagram of the front view structure at C in Fig. 10;

Fig. 12 is a schematic cross-sectional structure diagram along line D-D in Fig. 10;

Fig. 13 is a schematic structural view of the sand processing system of the present invention;

Fig. 14 is a process flow chart of the lost foam casting scraper wear part of the present invention.

Explanation of the symbols in the accompanying drawings:

1. Runner; 101. Drainage rib; 102. Insertion groove; 103. Weight reduction groove; 104. Main body of runner; 2. Inner runner; 201. Drainage block; 202. Insertion block; 3. Casting Lost foam; 4, fixed frame;

13. Scraper lost foam; 1301, scraper mouth; 13011, first inclined surface; 13012, second inclined surface; 13013, third inclined surface; 13014, fourth inclined surface; 1302, scraper blade body; 1303, scraper installation hole ; 13031, wear-resistant protective layer; 1304, scraper weight-reducing groove;

23. Evaporative mold of the side blade; 2301. The first use part; 23011. The first inclined surface of the side blade; 23012. The second inclined surface of the side blade; 23013. The third inclined surface of the side blade; 23014. The fourth inclined surface of the side blade; 2302, side blade body; 2303, side blade installation hole; 23031, side blade wear protection layer; 2304, weight-reducing gap; 2305, second use part; 2306, baffle plate;

33. The lost mold of the middle blade; 3301. The use part; 3302. The body of the middle blade; 3303. The installation hole of the middle blade; 33031. The wear-resistant protective layer of the middle blade; 3304. The weight-reducing groove of the middle blade;

1-1, fence; 1-2, upper vibrating sieve plate; 1-3, lower vibrating sieve plate; 1-4, first elevator; 1-5, magnetic separator; 1-6, high-pressure fan; 1- 7. Cooling cylinder; 1-8, air supply pipe; 1-9, dust cover; 1-10, second hoist; 1-11, conveyor belt; 1-12, sand bed; 1-13, sand box ; 1-14, vacuum distributor.

detailed description

In order to further understand the content of the present invention, the present invention will be described in detail in conjunction with the accompanying drawings and embodiments.

Example 1

With reference to Figures 1-6 and Figures 13-14, the process of the lost foam casting scraper wear-resistant part of this embodiment includes the following steps,

Step ST1, preparing a white mold;

Using expandable polystyrene as the raw material, put the raw material into the pre-foaming machine, and let steam at 70-100°C for 2-5 minutes for pre-foaming, so that the volume of the foam obtained after pre-foaming increases to the pre-foaming 5-10 times of that before foaming;

Use compressed air to flush the foam obtained after pre-foaming into the mold, pass steam at 50-100°C into the mold, and foam to obtain a white mold;

Pass cooling water into the mold from top to bottom, open the upper mold of the mold after the mold is cooled, and then pass compressed air into the mold from bottom to top, and eject the white mold from the mold; in this embodiment, Using compressed air to eject the white mold from the mold can avoid the problem of easy damage to the white mold when taking the mold manually, and improve the qualified rate of white mold preparation.

Wherein, the white mold includes runner 1, inner runner 2 and casting lost mold 3.

The runner 1 is in the shape of a long strip. The runner 1 includes a runner main body 104. The upper middle of the runner main body 104 is provided with drainage ribs 101 along the length direction. The upper part of the runner main body 104 is equally spaced along the length direction. There are 3 to 8 insertion slots 102 (specifically, 3 in this embodiment); the length direction of the insertion slots 102 is parallel to the width direction of the runner main body 104, and the insertion slots 102 are composed of two side walls and a rear Composed of walls, a rectangular groove with an opening at one end is formed, so that the plug-in block 202 on the inner runner 2 can be inserted into the rectangular groove along the opening of the rectangular groove to cooperate with it; both sides of the drainage rib 101 are symmetrically provided with weight-reducing grooves 103.

The lost foam 3 of the casting and the ingate 2 are integrally formed to ensure that the molten iron can flow smoothly into the lost foam 3 of the casting through the ingate 2, and there is no need to glue the lost foam 3 and the ingate 2 of the casting, saving time Labor-saving; the two sides of the lost foam 3 of the casting are symmetrically provided with inrunners 2, and the inrunners 2 include a drainage block 201 and a plug-in block 202, both of which are rectangular blocks, and the plug-in block 202 The width of the drainage block 201 is equal to the width of the drainage block 201. The drainage block 201 and the plug-in block 202 are perpendicular to each other to form an L-shaped structure. The drainage block 201 is fixedly connected with the lost foam 3 of the casting. /4 to 1/2 (1/4 in this embodiment); the plugging block 202 is used to cooperate with the above-mentioned plugging slot 102 .

In order to ensure that the inserting block 202 can be firmly fixed in the inserting groove 102, the width of the inserting block 202 is greater than the width of the inserting groove 102 by 2 to 3 mm (specifically 2 mm in this embodiment), so that the inserting block 202 squeezes Inserting into the insertion slot 102, the insertion slot 102 squeezes the insertion block 202 within it so that the insertion block 202 and the insertion slot 102 are fixed more firmly. The thickness of the plug-in block 202 is equal to the depth of the plug-in slot 102, so that the plug-in block 202 can be inserted into the plug-in slot 102 completely, so that there is no gap between the plug-in block 202 and the plug-in slot 102, which is beneficial to the molten iron Flows smoothly.

In the prior art, the runner and the inner runner are split, and the runner and the inner runner need to be glued together before casting. This design is laborious and laborious, and the production cost is high and the casting quality is reduced. At the same time, the runner is generally a rectangular long plate, which is not conducive to the flow of molten iron; in order to overcome the above shortcomings, the following improvements are made in this embodiment: (1) Through the cooperation of the plug block 202 and the plug slot 102, it can be conveniently A plurality of casting lost foams 3 are installed between two runners 1 at equal intervals, and multiple castings 3 are poured at one time, which improves production efficiency; the runners 1 and the inner runners are connected by plugging 2. Compared with the way of glue bonding, the operation is more convenient, so it saves time and effort, avoids the use of glue, and thus reduces the production cost; and the way of plugging is more firm, and it can be used in the process of transportation or sand filling and vibration of the sand box. It is not easy to fall off in the center, which greatly improves the casting quality; (2) the upper middle position of the runner main body 104 is provided with a drainage rib 101 along the length direction, and the drainage rib 101 plays a drainage effect on the molten iron, and the molten iron flows along the direction of the drainage rib 101 The length direction can be quickly and timely drained into each ingate 2, so that the temperature of the molten iron is uniform at each position, which is easy to form the casting and improves the yield; There are weight-reducing grooves 103 symmetrically on both sides. The design of weight-reducing grooves 103 not only reduces the residue after pouring, but also reduces the resistance to the flow of molten iron, improves the flow speed of molten iron, is beneficial to the uniform cooling of molten iron, and improves the casting forming process. the quality of.

In order to make the molten iron flow more smoothly along the length direction of the runner 1, a circular arc transition (instead of a right-angle structure) is adopted at the junction of the weight-reducing groove 103 and the insertion groove 102. Compared with the streamlined structure design of the circular arc transition Based on the design of the right-angle structure, the resistance to the flow of molten iron is reduced, and the quality of casting molding is improved.

Both sides of one end of the drainage rib 101 are provided with connecting blocks, which connect the side of the end of the drainage rib 101 with the runner main body 104. The setting of the connecting block expands the cross section of the end of the drainage rib 101, and the molten iron is self-drained The entry of the end of the rib 101 expands the flow area of the molten iron entering the end of the drainage rib 101, which is conducive to the smooth flow of molten iron.

In the prior art, the ingate is often designed as a small rectangular block connected to the casting model. When cleaning the molded casting after pouring, it is necessary to knock out and polish the solidified ingate connected to the casting. , but because the solidification of the ingate and the casting body are co-molded during pouring, it often results in the process of knocking out the solidification of the inrunner. Either the solidification of the inrunner leaves a section on the casting body that is difficult to remove, or the casting The part near the connection between the main body and the ingate solidification is also knocked off, which is not only time-consuming and labor-intensive, but also seriously affects the quality of the casting and increases the defective rate of the casting. In order to overcome the above shortcomings, the following improvements are made in this embodiment: the ingate 2 includes a drain block 201 and a plug-in block 202, the drain block 201 is fixedly connected with the lost foam 3 of the casting, and the plug-in block 202 is used to connect with the above-mentioned plug-in groove 102, the thickness of the drainage block 201 is 1/4 to 1/2 of the thickness of the plug-in block 202, and the thickness of the drainage block 201 in this embodiment is relatively small, which greatly facilitates the process of knocking out the solidification of the inner runner, that is, The thickness of the part where the inrunner solidification is connected to the casting body is relatively small, and it is easier to knock off the casting body and not stick to the casting body part. The knocked off part is more neat, easy to polish, saves time and labor, and improves The appearance quality of the casting; in this embodiment, the ingate 2 is designed to be L-shaped, so that the L-shaped structure of the ingate solidification is easy to be stressed, and it is convenient for the knock-out operation.

Specifically, in this embodiment, the casting lost foam 3 is a scraper lost foam 13. The scraper lost foam 13 includes a scraper body 1302 and a scraper opening 1301. The scraper opening 1301 is located on one side of the scraper body 1302, and the scraper body 1302 is symmetrical front and back. There are two scraper installation holes 1303 on the ground, and the scraper installation holes 1303 are waist-shaped holes for installing the scraper body 1302 on the mixing arm through bolts; a layer of wear-resistant protective layer 13031 is provided around the scraper installation hole 1303, The wear-resistant protective layer 13031 is 5-6mm higher than the upper surface of the scraper blade body 1302 (5mm is used in this embodiment), and the connection between the wear-resistant protective layer 13031 and the scraper blade body 1302 adopts a circular arc transition, and the circular arc transition The unique design can reduce the wear of the connection and enhance the use effect of the wear-resistant protective layer 13031. The outer surface of the scraper opening 1301 includes a first inclined surface 13011, a second inclined surface 13012, a third inclined surface 13013 and a fourth inclined surface 13014, the first inclined surface 13011 is the upper surface of the scraper opening 1301, and the first inclined surface 13011 is upward Inclined, the angle between the first inclined surface 13011 and the horizontal line is 30-35° (30° in this embodiment), the second inclined surface 13012 is connected to the first inclined surface 13011, and the second inclined surface 13012 is inclined downward , the angle between the second inclined surface 13012 and the vertical line is 50-55° (50° in this embodiment); the fourth inclined surface 13014 is the lower surface of the scraper mouth 1301, and the third inclined surface 13013 tilts the second inclined surface. The surface 13012 is connected with the fourth inclined surface 13014; in this embodiment, the outer surface of the scraper opening 1301 is composed of multiple inclined surfaces, and the unique structure of the scraper opening 1301 in this embodiment can significantly improve the corresponding position of the cast scraper wear-resistant parts performance and service life. Secondly, in order to reduce the weight of the wear-resistant part of the scraper after casting and reduce the manufacturing cost, there are symmetrical scraper weight-reducing grooves 1304 at the front and rear ends of the scraper body 1302 .

The main body of the existing scraper is designed as a plane body. During the concrete mixing process, there is great resistance to the mixing with the concrete, and there will be a lot of wear and tear during work, especially at the installation hole on the scraper. The bolts in the mounting holes are damaged. In actual engineering applications, it is easy to cause accidents such as the scraper is not installed firmly or falls off from the mixing arm, which reduces the service life of the scraper and increases the wear of the scraper wear parts. In order to overcome the above shortcomings, the following improvements are made in this embodiment: a wear-resistant protective layer 13031 is provided around the scraper installation hole 1303, and the wear-resistant protective layer 13031 is higher than the upper surface of the scraper blade body 1302 and has a certain thickness. It plays a significant role in protecting the scraper mounting hole 1303. When the scraper is working, when the wear-resistant protective layer 13031 is completely worn out, the scraper mounting hole 1303 will be worn away. This design greatly protects the scraper mounting hole 1303 and its The internal fixing bolts increase the service life of the scraper, thereby reducing the wear and tear of the scraper wear parts.

Step ST2, assembling the white mold;

In step ST2, the two runners 1 are vertically arranged so that the insertion grooves 102 on the two runners 1 face each other, and the three lost foams 3 of the casting are located between the two runners 1, and at the same time, The inventor has concluded through a large number of experiments that the final molding quality of the casting can be guaranteed only if the distance between the lost foam 3 of adjacent castings is at least 5 mm (10 mm in this embodiment); The runners 1 are matched to obtain a white mold assembly. Since the sprue 1 is equidistantly distributed on the sprue 102 , the adjacent lost foams 3 are equally spaced, which is conducive to the uniform flow of molten iron in the length direction of the runner 1 and improves the quality of casting molding.

Step ST3, preparing coating;

In step ST3, the refractory aggregate, organic binder, anhydrous binder, suspending agent, thickening stabilizer, defoamer and preservative are evenly mixed to obtain a coating, wherein: refractory aggregate accounts for 17% of the total mass of the coating. ~18% (17% is taken in the specific embodiment), the refractory aggregate is a mixture of brown corundum powder and quartz powder, and the particle diameters of brown corundum powder and quartz powder are more than 300 mesh; the organic binder is carboxymethyl fiber The mixture of plain sodium and white latex, sodium carboxymethyl cellulose accounts for 0.2～0.6% (0.2% in the specific present embodiment) of the total mass of the paint, and white latex accounts for 3～6% of the total mass of the paint (specifically this embodiment Get 3% in), contain the polyvinyl alcohol of mass percentage 20% in the white latex; The agent is sodium bentonite, and sodium bentonite accounts for 1% to 4% of the total mass of the coating (1% is taken in the specific embodiment); the thickening stabilizer is polyacrylamide, and polyacrylamide accounts for 0.1% to 0.2% of the total mass of the coating (Get 0.1% in the specific present embodiment).

In this embodiment, the coating prepared by using the above ingredients has low cost and can be firmly bonded to the surface of the white mold assembly. Compared with the coating used in the prior art, the coating in this embodiment makes the finished casting The one-time shedding percentage of the coating layer is further improved, the appearance of the casting is smooth after molding, and the qualified rate of the finished casting is also significantly increased.

Step ST4, brush paint;

The grooves and through holes on the lost foam 3 of the casting will have the following two problems during the pouring process: (1) The grooves and through holes on the lost foam 3 of the casting are very easy to be sanded after the casting is formed, which is not convenient for subsequent Sand cleaning operation; (2) Since the grooves and through holes on the lost foam 3 of the castings are at the slow flow of molten iron during pouring, the temperature of the molten iron here is relatively low during pouring, so that the condensation speed of the molten iron here is different from that of other castings during pouring. The condensation speed of the molten iron in the local area is not synchronized (that is, the condensation degree of the molten iron in the groove and through hole on the lost foam 3 of the casting is inconsistent with other places at the same time), and after the casting is formed, it is easy to form a large internal stress inside the casting, seriously Some even form cracks on the surface of castings. This problem has been a technical problem that has plagued the field of lost foam casting for many years. Aiming at the above technical problems in the prior art, the general solution is "post-processing". When a large internal stress is formed inside the casting due to the above reasons, it can be eliminated through the subsequent heat treatment process, but this increases the subsequent heat treatment process. , increasing the manufacturing cost. How to improve the construction process of a certain step before pouring or pouring, so as to achieve "pre-prevention", there has been no relevant technical solution or related technical solution that constitutes technical inspiration in the prior art.

In step ST4, brush a layer of 2-3 mm (2 mm in this embodiment) thick paint on all the groove surfaces and through-hole surfaces on the lost foam 3 of the casting with a brush, and dry; Brush a layer of 2-3mm thick paint on all the groove surfaces and through-hole surfaces on the lost foam 3 of the casting, relatively speaking, the coating thickness of all the groove surfaces and through-hole surfaces on the lost foam 3 of the casting is greater than that of the lost foam of the casting 3, therefore, the thermal conductivity between the grooves and through holes on the lost foam 3 of the casting and the surrounding molding sand is smaller than other parts on the lost foam 3 of the casting during pouring, so it can slow down the lost foam of the casting The coagulation speed of the molten iron at the groove on the 3 and the through hole makes the condensing speed of the molten iron at the groove and the through hole on the lost foam 3 of the casting keep in sync with the condensing speed of the molten iron at other places on the lost foam 3 of the casting during pouring, effectively eliminating The internal stress formed inside the casting after the casting is formed; at the same time, the thickness of the coating on the surface of the groove and the surface of the through hole on the lost foam 3 of the casting is relatively thick, and it is extremely difficult to get sand here after the casting is formed, which facilitates the subsequent sand cleaning operation. It should be noted that the inventor concluded through a large number of on-site experiments that the above-mentioned technical effect can only be guaranteed when the surface of the groove and the surface of the through hole on the lost foam 3 of the casting are pre-painted with a layer of 2-3 mm thick paint. When it is too thin, it cannot effectively ensure that the coagulation speed of the molten iron at the grooves and through holes on the lost foam 3 of the casting is kept in sync with the coagulation speed of the molten iron at other places on the lost foam 3 of the casting during pouring.

Step ST5, dipping paint;

In step ST5, the white mold assembly is prepared, and the runners 1 vertically arranged on both sides of the lost foam 3 of the casting are respectively tied to the arms on both sides of the fixing frame 4 through ropes, and the fixing frame 4 is a rectangular frame; The frame 4 is immersed in the paint pool as a whole, and the fixed frame 4 is taken out to dry; then the fixed frame 4 is immersed in the paint pool as a whole, and the fixed frame 4 is taken out and dried again. In this embodiment, when the whole white mold assembly is coated with paint, it is necessary to fix the white mold assembly through the fixing frame 4 to protect the overall structure of the white mold assembly.

Step ST6, modeling;

In step ST6, first lay a layer of molding sand on the bottom of the sand box 1-13, use a three-dimensional vibrating table to vibrate and level off, remove the white mold assembly from the fixing frame 4, and then hang the white mold assembly Put it into the middle of the sand box 1-13, add sand to the lower sand box 1-13 through the sand bed 1-12 and vibrate the sand box 1-13, the amplitude of the sand box 1-13 is 0.2-0.4mm, until Stop adding sand when the molding sand is 10-20mm away from the upper mouth of the sand box 1-13, stop the vibration after 30-45s, then lay a plastic film on the top of the sand box 1-13, cover the plastic film with dry sand, and place it well. Cup, ready to pour.

Step ST7, pouring;

In step ST7, the pouring temperature is controlled at 1350-1400° C., and the negative pressure in the flask 1-13 is controlled to be 0.015-0.025 MPa during pouring. After pouring, the vacuum is removed after 6-7 minutes.

Step ST8, molding sand recovery;

In step ST8, the sand processing system is used to recover the molding sand, the sand box 1-13 is moved to the fence 1-1 and turned over, the casting is intercepted by the fence 1-1, and the molding sand to be processed falls through the through hole on the fence 1-1. On the upper vibrating sieve plate 1-2, with the vibration of the upper vibrating sieve plate 1-2, the qualified molding sand falls on the lower vibrating sieve plate 1-3 through the through holes on the upper vibrating sieve plate 1-2, and the large particles Impurities and unqualified molding sand are left on the upper vibrating screen plate 1-2; the molding sand on the lower vibrating screen plate 1-3 is lifted to the entrance of the cooling cylinder 1-7 by the first elevator 1-4, and cooled The magnetic separation treatment is carried out at the entrance of cylinder 1-7, and the molding sand after magnetic separation treatment enters the cooling cylinder 1-7 for cooling and dedusting, and the cooled and dedusting molding sand is conveyed by the second hoist 1-10 and the conveyor belt 1-11 in turn to each sand bed 1-12 to complete the molding sand recovery process;

Among them, the sand processing system includes a fence 1-1, a vibrating screen, a first hoist 1-4, a cooling cylinder 1-7, a dust collection cover 1-9, a second hoist 1-10, a conveyor belt 1-11, a sand Bed 1-12 and sand box 1-13, vibrating screen is arranged below fence 1-1, and this vibrating screen includes upper vibrating sieve plate 1-2, lower vibrating sieve plate 1-3 all connected with vibrating motor, and upper vibrating sieve The plate 1-2 and the lower vibrating sieve plate 1-3 are set up and down in parallel; the upper vibrating sieve plate 1-2 is evenly distributed with through holes, and both ends of the upper vibrating sieve plate 1-2 are equipped with baffles; One end of the sieve plate 1-3 is provided with a baffle plate, and the other end is inclined downward in the direction of the first elevator 1-4, so that the angle between the lower vibrating sieve plate 1-3 and the horizontal plane is 4-5° (specifically, in this implementation In the example, be 4 °); In the present embodiment, owing to the inclined setting of last vibrating screen plate 1-2 and following vibrating screen plate 1-3, after making the molding sand to be treated fall on the last vibrating screen plate 1-2, after vibrating sieve plate 1-2, Under the action, it will slowly move towards the direction of the first hoist 1-4. During the moving process, the molding sand is filtered and spread out at the same time, avoiding the impact on the upper vibrating screen due to the accumulation of molding sand directly under the fence 1-1. 1-2 The problem of filtration efficiency, and the large particles of impurities and unqualified molding sand left after being filtered by the upper vibrating sieve plate 1-2 are automatically sent to the upper vibrating sieve plate 1-2 close to the first elevator 1- The baffle plate at one end of 4 is convenient for centralized recovery and treatment of large particles of impurities and molding sand with unqualified size; the molding sand with qualified size is sent to the first elevator 1-4 at a uniform speed on the lower vibrating screen plate 1-3; among them, the inventor After many times of on-site practice, it is found that the angle between the lower vibrating screen plate 1-3 and the horizontal plane is designed to be 4-5° (that is, the angle between the upper vibrating screen plate 1-2 and the horizontal plane is 4-5°), ensuring The molding sand on the upper vibrating sieve plate 1-2 can be flattened at a uniform speed to ensure its filtering effect, and the molding sand with a qualified size on the lower vibrating sieve plate 1-3 can be moved to the first hoist 1-4 at a uniform speed and gently. It is compatible with the sand processing capacity per unit time of the sand processing system in this embodiment. The first hoist 1-4 is located on one side of the lower vibrating sieve plate 1-3, and the first hoist 1-4 is used to lift the molding sand flowing down the lower vibrating sieve plate 1-3 to the inlet of the cooling cylinder 1-7, A magnetic separator 1-5 is provided at the entrance of the cooling cylinder 1-7, and the magnetic separator 1-5 is used to magnetically separate the molding sand entering the cooling cylinder 1-7. In this embodiment, the molding sand to be processed first passes through After the upper vibrating sieve plate 1-2 filters out large-grained impurities (including large-grained iron impurities) and unqualified molding sand, the magnetic separation process is carried out through the magnetic separator 1-5. This design greatly reduces the pressure of the magnetic separator 1. The workload of -5 is beneficial to improve the treatment effect and efficiency of molding sand. Above the outlet of the cooling cylinder 1-7, a dust collection cover 1-9 is provided. The dust collection cover 1-9 not only absorbs the dust-laden air at the outlet of the cooling cylinder 1-7, but also absorbs dusty air at the outlet of the cooling cylinder 1-7. Partial negative pressure is formed at the outlet of 7, so that a pressure difference is formed at the inlet and outlet of the cooling cylinder 1-7, and the molding sand at the inlet of the cooling cylinder 1-7 moves into the cooling cylinder 1-7 under the action of the pressure difference.

From the perspective of the lost foam casting process and equipment requirements, it is inevitable that the molding sand will be broken and pulverized during the molding process and sand treatment process. At the same time, the decomposed paint dust during the casting process will also be mixed into it, which will deteriorate the performance of the molding sand. Reduce its gas permeability and consume more paint in the paint step, so it is necessary to remove the dust formed by the crushing and pulverization of the molding sand and the decomposition of the paint.

In this embodiment, the cooling cylinder 1-7 mainly plays the role of cooling the molding sand and removing dust in the molding sand. The bottom surface of the cooling cylinder 1-7 is respectively connected with three air supply pipes 1-8, and the above three air supply pipes 1-8 8 are distributed at equal intervals along the length direction of the cooling cylinder 1-7 and are all connected to the air outlet of the high-pressure fan 1-6; the inner wall of the cooling cylinder 1-7 is surrounded by a cooling water coil, and the middle of the cooling cylinder 1-7 A spiral cooling water pipe is erected at the position of the axis. The molding sand in the cooling cylinder 1-7 is blown up by the high-pressure gas fed by the three air supply pipes 1-8, and the blown molding sand is mainly exchanged with the spiral cooling water pipe erected at the central axis of the cooling cylinder 1-7. At the same time, the molding sand also exchanges heat with the cooling water coil installed on the inner wall of the cooling cylinder 1-7 during the blowing process. The molding sand is rapidly cooled after the heat exchange between the spiral cooling water pipe and the cooling water coil. The partial negative pressure formed at the outlet of the cooling cylinder 1-7 moves to the outlet of the cooling cylinder 1-7. In this embodiment, the cooling water coil and the spiral cooling water pipe enclose the molding sand together, so that the molding sand can be fully exchanged in any direction in the cooling cylinder 1-7, which greatly improves the cooling capacity of the cooling cylinder 1-7. cooling effect. In this embodiment, the molding sand is blown up by the high-pressure gas fed by the three air supply pipes 1-8 in the cooling cylinder 1-7, which not only can fully diffuse the molding sand to improve its heat exchange effect, but also fully dissipate the dust in the molding sand. Raise, help the dust suction hood 1-9 that the cooling cylinder 1-7 exit top is provided with all the dust in the molding sand is sucked away.

The second hoist 1-10 is located at the side of the outlet of the cooling cylinder 1-7, and the second hoist 1-10 is used to lift the molding sand flowing down from the outlet of the cooling cylinder 1-7 to the conveyor belt 1-11; the conveyor belt 1-11 is located above at least three sand beds 1-12, and the conveyor belt 1-11 is used to transport the molding sand to each sand bed 1-12. The cost of using the conveyor belt 1-11 to transport the molding sand is low, and can be used according to specific needs. The molding sand is transported to a specific sand bed 1-12, and a sand box 1-13 is arranged below the sand bed 1-12; in order to facilitate the transportation of the sand box 1-13, a pulley is provided at the bottom of the sand box 1-13, and each A track for the sand box 1-13 to slide is provided between the bottom of each sand bed 1-12 and the fence 1-1. The bottom of each sand bed 1-12 is provided with a three-dimensional vibrating table, and in the molding process, the sand box 1-13 is fixed with the three-dimensional vibrating table, and the three-dimensional vibrating table is used for vibrating the sand box 1-13, because The three-dimensional vibrating table can vibrate in three mutually perpendicular directions, so the vibration effect of the three-dimensional vibrating table is more obvious, which is conducive to improving the quality of the final molding of the casting.

The sand processing system also includes a vacuum distributor 1-14, which is provided with multiple inlets, and the inlets are connected to the vacuum ports on the sand box 1-13 through pipelines; the vacuum distributor 1-14 14 links to each other with vacuuming equipment, and this vacuumizing equipment comprises vacuum pump, air tank and water tank; In the present embodiment, the setting of vacuum distributor 1-14 makes one vacuumizing equipment can carry out pumping to a plurality of sandboxes 1-13 simultaneously. Vacuum treatment improves the working efficiency of the vacuum equipment and reduces the production cost.

In this embodiment, in order to improve the working environment on site and avoid dust pollution, a dust suction device is provided above the fence 1-1, above the vibrating screen (not shown), and above each sand bed 1-12 (not shown). Hoods 1-9 to remove dust from the air.

In this embodiment, the dust collection covers 1-9 are all connected with the dust removal equipment, and the dust removal equipment includes a cyclone dust collector, a bag filter and a dust removal fan, and the dust collection covers 1-9 are connected with the entrance of the cyclone dust collector, and the cyclone dust collector The outlet of the dust collector is connected with the dust removal fan through the bag filter; among them, the dust removal fan provides suction, and the dusty air absorbed in the dust collection cover 1-9 first passes through the cyclone dust collector to remove large particles of dust, and at the same time avoids the impact of large particles of dust on the air. The wear of the bag on the bag filter protects the bag; then the small particles of dust are removed by the bag filter, and the dedusted air is finally discharged by the dust removal fan; in this embodiment, the dust removal equipment adopts two-stage dust removal, and the dust removal effect is better.

In this embodiment, on the upper vibrating sieve plate 1-2, the closer to the position where the first elevator 1-4 is located, the longer the material is vibrated on it, so on the upper vibrating sieve plate 1-2, the closer At the position in the direction of the first hoist 1-4, the molding sand with large particles of impurities and unqualified sizes is more likely to be crushed into small particles and fall into the lower vibrating screen plate 1-3 below, and in the present embodiment will The through-hole diameter on the upper vibrating screen plate 1-2 is designed to gradually decrease from one end to the other end where the first elevator 1-4 is located, which can effectively avoid the occurrence of the above-mentioned problems.

To sum up, the sand treatment system in this embodiment has an ingenious structural design and low manufacturing and operating costs.

Step ST9, casting cleaning;

In step ST9, the molding sand on the surface of the casting is removed, and the solidified ingate solidified on both sides of the casting is knocked off and polished.

Step ST10, heat treatment;

In step ST10, put the casting into the heating furnace, heat it to 945°C at a constant speed for 4.5 hours, then keep it warm for 2 hours, then cool it down to 865°C after 1 hour, and then air-cool it. Blow air to the vibrating table along the horizontal direction, the surface of the vibrating table is evenly distributed with through holes, and the vibration height of the casting is 15-25mm.

In this embodiment, the casting is placed on a vibrating table for air quenching, and the casting can leave the vibrating table during air quenching, so that the entire outer surface of the casting can be uniformly quenched, which can solve the problem of uneven quenching that exists in the current air quenching of wear-resistant castings Among them, through holes are evenly distributed on the surface of the vibrating table, forming air passages through up and down, ensuring the effect of air quenching on multiple sides of the casting.

Compared with the heat treatment process in the prior art, the heat treatment process in this embodiment can significantly improve the hardness of the casting. After the casting is processed by the heat treatment process in this embodiment, its HRC hardness is increased to 60-65, and the surface hardness of the casting is Uniform, better able to adapt to actual use needs.

The process of the lost foam casting scraper wear-resistant part of this embodiment can greatly improve the casting quality of the scraper wear-resistant part, and the one-time qualified rate of the casting product reaches about 98%.

Example 2

The process of the lost foam casting scraper wear-resistant part of this embodiment is basically the same as that of embodiment 1, the difference is that:

The upper part of the runner main body 104 is provided with 8 insertion slots 102 at equal intervals along the length direction; the thickness of the drainage block 201 is 1/2 of the thickness of the insertion block 202; the width of the insertion block 202 is greater than the width of the insertion slot 102 3mm.

The wear-resistant protective layer 13031 is 6mm higher than the upper surface of the scraper body 1302; the angle between the first inclined surface 13011 and the horizontal line is 35°; the angle between the second inclined surface 13012 and the vertical line is 55°.

In step ST3, refractory aggregate accounts for 18% of the total mass of the coating, sodium carboxymethylcellulose accounts for 0.6% of the total mass of the coating, white latex accounts for 6% of the total mass of the coating, silica sol accounts for 8% of the total mass of the coating, and sodium Base bentonite accounts for 4% of the total mass of the paint, and polyacrylamide accounts for 0.2% of the total mass of the paint.

In step ST4, brush a layer of 3 mm thick paint on all the groove surfaces and through hole surfaces on the lost foam 3 of the casting with a brush; in step ST8, the angle between the lower vibrating sieve plate 1-3 and the horizontal plane is 5°; In step ST10, the casting is put into the heating furnace, heated to 950° C. at a constant speed for 5 hours, then kept for 3 hours, cooled to 860° C. after 2 hours, and then air-cooled after being released from the furnace.

Example 3

Combining with Figures 7-9, the process of casting the wear-resistant part of the side blade in this embodiment is basically the same as that of Embodiment 1, the difference is that in the white mold prepared in step ST1, the casting lost pattern 3 is the disappearance of the side blade mold 23, the side vane evaporative mold 23 includes a side vane body 2302, a first use part 2301 and a second use part 2305, and the first use part 2301 and the second use part 2305 are respectively located on two adjacent sides of the side vane body 2302 Above, during the concrete mixing process, the first use part 2301 is in contact with the side liner, and the second use part 2305 is in contact with the inner wall of the mixing tank; the second use part 2305 is higher than the upper surface of the side blade body 2302, and the second use part 2305 The outer wall of the outer wall is a curved surface, and the design of the curved surface reduces the resistance on the outer wall of the second use part 2305 during the concrete mixing process, reduces the wear of the second use part 2305, and improves the service life of the side blades; the side blade body Two side vane installation holes 2303 are symmetrically arranged on the front and back of the 2302, and the side vane installation holes 2303 are waist-shaped holes, which are used to install and fix the side vane body 2302 by bolts; Wear-resistant protective layer 23031, the side blade wear-resistant protective layer 23031 is higher than the upper surface of the side blade body 2302 by 5-6mm (specifically 5mm in this embodiment), and the side blade wear-resistant protective layer 23031 and the side blade body 2302 The connection adopts circular arc transition, and the design of circular arc transition can reduce the wear of the joint and enhance the use effect of the wear-resistant protective layer 23031.

The outer surface of the first use portion 2301 includes a first inclined surface 23011 of a side blade, a second inclined surface 23012 of a side blade, a third inclined surface 23013 of a side blade and a fourth inclined surface 23014 of a side blade, and the first inclined surface 23011 of the side blade is the first inclined surface 23014 of the side blade. On the upper surface of the use part 2301, the first inclined surface 23011 of the side blade is inclined downward, the fourth inclined surface 23014 of the side blade is the lower surface of the first use part 2301, the fourth inclined surface 23014 of the side blade is inclined downward, and the fourth inclined surface 23014 of the side blade is inclined downward. The three inclined surfaces 23013 are connected to the fourth inclined surface 23014 of the side blade, and the third inclined surface 23013 of the side blade is inclined upward, and the included angle between the third inclined surface 23013 of the side blade and the horizontal line is 50-55° (specifically, 50° is taken in this embodiment. °); the second inclined surface 23012 of the side blade connects the third inclined surface 23013 of the side blade with the first inclined surface 23011 of the side blade, and the included angle between the second inclined surface 23012 of the side blade and the third inclined surface 23013 of the side blade is 90°. In this embodiment, the outer surface of the first use part 2301 is composed of a plurality of inclined surfaces, and the use performance and service life of the first use part 2301 with the unique structure in this embodiment can be significantly improved. Secondly, in order to reduce the weight of the cast rear side blade body 2302 and lower the manufacturing cost, an arc-shaped weight-reducing notch 2304 is provided on the side of the side blade body 2302 that is not the first use part 2301 and the second use part 2305 . In order to improve the stirring effect of the side blades and shorten the stirring cycle, a baffle 2306 is provided on the side blade body 2302, the baffle 2306 is higher than the upper surface of the side blade body 2302, and the baffle 2306 is set opposite to the second use part 2305 , during the concrete mixing process, the setting of the baffle plate 2306 increases the mixing amount of the side blades, so that one mixing can drive more concrete movement. In the same mixing time, the concrete is mixed more evenly, thus shortening the mixing time of the concrete cycle, reducing production costs.

Example 4

The process of casting the side blade wear parts of this embodiment is basically the same as that of embodiment 3, the difference is that: the side blade wear protection layer 23031 is 6mm higher than the upper surface of the side blade body 2302; the side blade third The included angle between the inclined surface 23013 and the horizontal line is 55°.

Example 5

Combining with Figures 10-12, the process of casting the wear-resistant part of the middle blade in this embodiment is basically the same as that of Embodiment 1, the difference is that in the white mold prepared in step ST1, the casting lost pattern 3 is the disappearance of the middle blade mold 33, the middle vane lost mold 33 includes a middle vane body 3302 and a use part 3301, the middle vane body 3302 is a T-shaped structure, and the rear side of the middle vane body 3302 is provided with a use part 3301, during the concrete mixing process, use Part 3301 is in contact with the inner wall of the mixing tank; the use part 3301 is higher than the upper surface of the middle blade body 3302, and the connection between the use part 3301 and the middle blade body 3302 is a circular arc transition, and the design of the circular arc transition reduces the concrete mixing process. The resistance received by the outer wall of the use part 3301 reduces the wear of the use part 3301 and improves the service life of the middle blade; the middle blade body 3302 is symmetrically provided with two middle blade installation holes 3303, and the middle blade installation holes 3303 are circular shaped hole, used to install and fix the middle blade body 3302 by bolts; a layer of middle blade wear protection layer 33031 is provided around the middle blade installation hole 3303, and the middle blade wear protection layer 33031 is higher than the upper surface of the middle blade body 3302 5-6mm (specifically, 5mm is taken in this embodiment); and the connection between the middle blade wear-resistant protective layer 33031 and the middle blade body 3302 adopts a circular arc transition, and the design of the circular arc transition can reduce the wear of the joint and strengthen the middle blade. The use effect of wear-resistant protective layer 33031.

The upper surface and the lower surface of the front part of the middle blade body 3302 are all inclined between the two, and the angle between the upper surface and the lower surface of the front part of the middle blade body 3302 is α=10～11 ° (in this embodiment, 10 ° ); adopting the middle blade body 3302 of the unique structure in this embodiment can significantly improve its performance and service life. Secondly, in order to reduce the weight of the middle blade body 3302 after casting and reduce the manufacturing cost, the middle blade body 3302 is designed as a T-shaped structure in this embodiment, and two middle blade weight-reducing grooves are symmetrically arranged on the middle blade body 3302 3304, on the premise of ensuring the structural strength of the middle blade body 3302, the weight of the middle blade body 3302 is reduced.

During the concrete mixing process, the existing middle blade has great resistance to the mixing with the concrete, and there will be a lot of wear and tear during work, especially at the installation hole on the middle blade, which will make the installation hole Bolt damage, in actual engineering applications, often easily leads to accidents such as the installation of the middle blade is not firm or directly falls off, which reduces the service life of the middle blade, thereby increasing the loss of wear-resistant parts. In order to overcome the above-mentioned shortcomings, in this embodiment: a middle blade wear-resistant protective layer 33031 is provided around the middle blade installation hole 3303, and the middle blade wear-resistant protective layer 33031 is higher than the upper surface of the middle blade body 3302 and has a certain thickness. , the installation hole 3303 of the middle blade plays a significant role in protection. When the middle blade is working, the wear-resistant protective layer 33031 of the middle blade will be completely worn out before the installation hole 3303 of the middle blade will be worn. This design greatly protects the middle blade. The blade mounting hole 3303 and the bolts therein increase the service life of the middle blade, thereby reducing the loss of wear parts.

Example 6

The process of casting the wear-resistant part of the middle blade in this embodiment is basically the same as that of Embodiment 5, the difference is that: the wear-resistant protective layer 33031 of the middle blade is 6mm higher than the upper surface of the middle blade body 3302; the middle blade body 3302 The angle between the upper surface and the lower surface of the front part is 11°.

The above schematically describes the present invention and its implementation, which is not restrictive, and what is shown in the drawings is only one of the implementations of the present invention, and the actual structure is not limited thereto. Therefore, if a person of ordinary skill in the art is inspired by it, without departing from the inventive concept of the present invention, without creatively designing a structural mode and embodiment similar to the technical solution, it shall all belong to the protection scope of the present invention .

Claims (6)

1. a kind of technique of lost foam casting wearing piece, it is characterised in that：Comprise the following steps,

Step ST1, prepare white mould；

With expandable polystyrene as raw material, raw material is put into pre-foaming machine, the steam for being passed through 70~100 DEG C enters for 2~5 minutes Row prefoam so that the foam volume obtained after prefoam increases to 5~10 times before prefoam；

The foam obtained after prefoam is rushed in mould using compressed air, to the steam that 50~100 DEG C are passed through in mould, hair Bubble obtains Bai Mo；

To being passed through cooling water from top to bottom in mould, the upper mould of mould is opened after after mould cooling, then in mould from lower On be passed through compressed air, white mould is ejected from mould；

Wherein, the white mould includes cross gate (1), ingate (2) and casting evaporative pattern (3)；

Step ST2, the white mould of assembling；

Step ST3, prepare coating；

Step ST4, swabbing；

Step ST5, dip-coating material；

Step ST6, moulding；

Step ST7, cast；

Step ST8, molding sand are reclaimed；

Step ST9, casting cleaning；

Step ST10, heat treatment；

Bai Mozhong prepared by step ST1, the cross gate (1) is strip, and cross gate (1) includes cross gate main body (104), should Cross gate main body (104) upper middle position is provided with drainage muscle (101) along its length, and cross gate main body (104) top is along length Degree direction is also equally spacedly provided with 3~8 inserting grooves (102), and the both sides of the drainage muscle (101) symmetrically offer lightening grooves (103)；

The casting evaporative pattern (3) and ingate (2) are integrally formed, and the both sides of casting evaporative pattern (3) are symmetrically provided with interior Running channel (2), the ingate (2) includes drainage block (201) and grafting block (202), the drainage block (201) and grafting block (202) Be mutually perpendicular to collectively form L-shaped structure, the thickness of the thickness less than grafting block (202) of drainage block (201), drainage block (201) with Casting evaporative pattern (3) is connected, and grafting block (202) with above-mentioned inserting groove (102) for being engaged；

The lightening grooves (103) use arc transition with the intersection of inserting groove (102)；The thickness of the drainage block (201) is The 1/4~1/2 of grafting block (202) thickness；

, parallel to cross gate main body (104) width, the inserting groove (102) is by two for the length direction of the inserting groove (102) Side wall and rear wall are constituted；Drainage block (201) and grafting block (202) are rectangular block, and the inserting groove (102) is one end open Rectangular channel；

The width of the grafting block (202) is equal with the width of drainage block (201), and the width of grafting block (202) is more than inserting groove (102) 2~3mm of width, the thickness of grafting block (202) is equal to the depth of inserting groove (102)；

The both sides of drainage muscle (101) one end are provided with contiguous block, the contiguous block by the side of drainage muscle (101) end with it is horizontal Runner body (104) is connected.

2. the technique of lost foam casting wearing piece according to claim 1, it is characterised in that：In step ST2, by two horizontal strokes Running channel (1) is vertically arranged so that the inserting groove (102) on two cross gates (1) is facing each other, 3~8 casting evaporative patterns (3) Between two cross gates (1), and at least at a distance of 5mm between adjacent casting evaporative pattern (3), casting evaporative pattern (3) both sides Ingate (2) is engaged with the cross gate (1) of respective side respectively, obtains white mould assembly.

3. the technique of lost foam casting wearing piece according to claim 1, it is characterised in that：In step ST3, by fire resisting bone Material, organic binder, anhydrous adhesive, suspending agent, thickening stabilizing agent, defoamer and preservative are well mixed to be applied Material, wherein：Refractory aggregate accounts for the 17~18% of coating gross mass, and refractory aggregate is the mixture of brown alundum powder and silica flour, institute The particle diameter for stating brown alundum powder and silica flour is more than 300 mesh；Organic binder is the mixed of sodium carboxymethylcellulose and white glue with vinyl Compound, the sodium carboxymethylcellulose accounts for the 0.2~0.6% of coating gross mass, and white glue with vinyl accounts for the 3~6% of coating gross mass, institute State the polyvinyl alcohol containing mass percent 20% in white glue with vinyl；Anhydrous adhesive is Ludox, and it is total that the Ludox accounts for coating The 3~8% of quality；Suspending agent is sodium bentonite, and the sodium bentonite accounts for the 1~4% of coating gross mass；Thickening stabilizing agent It is polyacrylamide, the polyacrylamide accounts for the 0.1~0.2% of coating gross mass.

4. the technique of lost foam casting wearing piece according to claim 2, it is characterised in that：

It is with writing brush that one layer of 2~3mm of all of groove surfaces on casting evaporative pattern (3) and through-hole surfaces brush is thick in step ST4 Coating, drying；

In step ST5, prepare white mould assembly, the cross gate (1) that casting evaporative pattern (3) both sides are vertically arranged is respectively by rope Son is bundled in the two side arms of fixed mount (4), and the fixed mount (4) is rectangular frame；Then by fixed mount (4), integrally immersion is applied In material pond, fixed mount (4) drying is taken out；Again by fixed mount (4) integrally immersion coating pond, take out fixed mount (4) and dry again；

In step ST6, first sandbox (1-13) bottom spread a stratotype sand, using three-dimensional vibrating-compaction table jolt ramming, shake it is smooth, by white module Dress body is removed from fixed mount (4), then white mould assembly is hung into middle part in sandbox (1-13), downward by casting bed (1-12) At the uniform velocity add sand in the sandbox (1-13) of side and vibrate sandbox (1-13), the amplitude of sandbox (1-13) is 0.2~0.4mm, until type Stop plus sand when sand is from sandbox (1-13) 10~20mm suitable for reading, stop stopping vibration after adding 30~45s of sand, then in sandbox (1- 13) top laying plastic sheeting, and with dry sand gland plastic sheeting, sprue cup is placed, it is to be cast；

In step ST7, pouring temperature is controlled to 1350~1400 DEG C, and control negative pressure value 0.015 in sandbox (1-13) during cast~ 0.025MPa, after being poured, crosses 6~7min removal vacuum；

In step ST9, the molding sand of cast(ing) surface is removed, and the ingate coagulum that casting both sides are connected is knocked out, polishing is done Only.

5. the technique of lost foam casting wearing piece according to claim 2, it is characterised in that：

In step ST8, molding sand recovery is carried out using sand preparing system, sandbox (1-13) is moved on fence (1-1) and mould turnover, casting Part is intercepted by fence (1-1), and molding sand is dropped down onto on upper oscillating screen plate (1-2) by the through hole on fence (1-1), with upper vibratory sieve The vibration of plate (1-2), the molding sand of size qualification is fallen on lower oscillating screen plate (1-3) by the through hole on upper oscillating screen plate (1-2), Impurity and out-of-size molding sand are left on oscillating screen plate (1-2)；Molding sand on lower oscillating screen plate (1-3) passes through first Elevator (1-4) is promoted to cooling cylinder (1-7) porch, and carries out magnetic separation treatment, magnetic separation treatment in cooling cylinder (1-7) porch Molding sand afterwards enters cooling, dedusting in cooling cylinder (1-7), cooling, the molding sand after dedusting pass sequentially through the second elevator (1-10), Conveyer belt (1-11) is delivered in each casting bed (1-12), completes molding sand removal process；

Wherein, the sand preparing system includes fence (1-1), vibratory sieve, the first elevator (1-4), cooling cylinder (1-7), dust suction Cover (1-9), the second elevator (1-10), conveyer belt (1-11), casting bed (1-12) and sandbox (1-13), the fence (1-1) Lower section sets vibratory sieve, and the vibratory sieve includes the upper oscillating screen plate (1-2), the lower oscillating screen plate (1-3) that are connected with vibrating motor, Upper oscillating screen plate (1-2) and lower oscillating screen plate (1-3) is upper and lower be arranged in parallel；It is evenly equipped with the upper oscillating screen plate (1-2) logical Hole, the two ends of upper oscillating screen plate (1-2) are equipped with baffle plate；One end of the lower oscillating screen plate (1-3) is provided with baffle plate, the other end to The inclined downward in direction where first elevator (1-4)；First elevator (1-4) is located at the one of lower oscillating screen plate (1-3) Side, the first elevator (1-4) is used to for the molding sand flowed down on lower oscillating screen plate (1-3) to be promoted to cooling cylinder (1-7) porch, cold But it is provided with dust shield (1-9) above cylinder (1-7) exit；Second elevator (1-10) exports positioned at cooling cylinder (1-7) The side at place, the second elevator (1-10) is used to for the molding sand that cooling cylinder (1-7) exit flows down to be promoted to conveyer belt (1-11) On；The conveyer belt (1-11) is located at least three casting beds (1-12) top, and conveyer belt (1-11) is used to for molding sand to be delivered to sand In bed (1-12), sandbox (1-13) is provided with below casting bed (1-12)；

The sand preparing system also includes vacuum distribution (1-14), and the vacuum distribution (1-14) is provided with multiple access ports, The access port is connected by pipeline with the vacuum orifice on sandbox (1-13)；The vacuum distribution (1-14) and vaccum-pumping equipment It is connected；

Cooling cylinder (1-7) porch is provided with magnetic separator (1-5), and the magnetic separator (1-5) is used for will be interior into cooling cylinder (1-7) Molding sand carry out magnetic separation treatment；

Cooling cylinder (1-7) bottom surface is connected with three ajutages (1-8) respectively, and above three ajutage (1-8) is along cooling Cylinder (1-7) length direction equidistantly distributed and the air outlet with high pressure positive blower (1-6) be connected；The cooling cylinder (1-7) Cooling water coil is surrounded with inwall, being set up at the internal axis line position of cooling cylinder (1-7) has helical form cooling water pipe；

Fence (1-1) top, vibratory sieve top, each casting bed (1-12) top are provided with dust shield (1-9)；

The dust shield (1-9) is connected with cleaner, and the cleaner includes cyclone dust collectors, sack cleaner and removes Dirt blower fan, the dust shield (1-9) is connected with the entrance of cyclone dust collectors, and the outlet of cyclone dust collectors passes through sack cleaner It is connected with dedusting fan；

The lower oscillating screen plate (1-3) is 4~5 ° with the angle of horizontal plane；

Through-hole aperture on the upper oscillating screen plate (1-2) from the other end from certain one end to direction where the first elevator (1-4) It is gradually reduced；

The track that a sand supplying case (1-13) is slided is equipped between the lower section of each casting bed (1-12) and fence (1-1)；

Three-dimensional vibrating-compaction table is equipped with below each casting bed (1-12).

6. the technique of lost foam casting wearing piece according to claim 2, it is characterised in that：In step ST10, by casting It is put into heating furnace, by 4.5~5h constant-speed heatings to 945~950 DEG C, is then incubated 2~3h, then be cooled to by 1~2h 860~865 DEG C, air cooling of coming out of the stove, wherein, casting is put during air cooling is vibrated on a vibration table, and in the horizontal direction to shake table drum Wind, the uniform through hole in shake table surface, the height of casting vibration is 15~25mm.