Hardware Silica Sol Investment Casting

After more than ten years of precipitation, Qinhuangdao Zhongwei Precision Machinery Co., Ltd. has rich production experience in water glass lost wax precision casting, lost foam precision casting technology, silica sol precision casting technology, and shell sand casting technology. We expect manufacturers from all over the world to consult and negotiate business

The Origin Of Hardware Investment Castings

Lost wax casting is now called investment casting. It is a casting process with little or no cutting. It is an excellent process technology in the foundry industry and is widely used. It is not only suitable for casting of various types and alloys, for example, it can be used in Hardware Silica Sol Investment Casting, but also produces castings with higher dimensional accuracy and surface quality than other casting methods, and even other casting methods are difficult to cast. The complex, high temperature resistant and difficult to process castings can be cast by investment casting.

Investment casting is developed on the basis of ancient wax casting. As an ancient civilization, China is one of the countries that used this technology earlier. As far back as hundreds of BC, the ancient working people of our country created this lost wax casting technology, which is used to cast various fine patterns and characters. The bells, tripods and utensils and other products, such as the tomb of Zeng Houyi in the Spring and Autumn Period, etc. The base of Zenghouyi's tomb is a plurality of intertwined dragons. They are connected end to end and staggered up and down to form a multi-layered moiré-like pattern hollowed out in the middle. These patterns are difficult to produce by ordinary casting techniques, and are cast by lost wax method. Craftsmanship can take advantage of the fact that paraffin has no strength and is easy to carve, and ordinary tools can be used to carve the same paraffin material as the tomb plate of Zenghou Yi, and then add a pouring system, paint, dewax, pour, You can get the exquisite memorial plate of the tomb of Marquis Yi of Zeng.

The practical application of modern investment casting methods in industrial production was in the 1940s. The development of aviation jet engines at that time required the manufacture of heat-resistant alloy parts with complex shapes, precise dimensions and smooth surfaces, such as blades, impellers, and nozzles. Since the heat-resistant alloy materials are difficult to machine and the shapes of the parts are so complex that they cannot or are difficult to manufacture by other methods, it is necessary to find a new precise molding process, so the lost wax casting handed down from ancient times is used for reference. With the improvement of modern investment casting methods, important development has been achieved on the basis of ancient craftsmanship. Therefore, the development of the aviation industry has promoted the application of investment casting, and the continuous improvement and perfection of investment casting has also created favorable conditions for the aviation industry to further improve its performance.

my country began to apply investment casting to industrial production in the 1950s and 1960s. Since then, this advanced casting process has been greatly developed, and has been widely used in aviation, automobiles, machine tools, ships, internal combustion engines, gas turbines, telecommunication equipment, weapons, medical equipment and cutting tools and other manufacturing industries. Manufacture of works of art.

The so-called investment casting process, simply put, is to use fusible materials (such as wax or plastic) to make a fusible model (referred to as investment mold or model), and apply several layers of special refractory coatings on it, which are dried and hardened. After forming an integral mold shell, the mold is melted from the mold shell with steam or hot water, and then the mold shell is placed in a sand box, filled with dry sand molding around it, and finally the mold is placed in a roasting furnace for high temperature. Roasting (for example, when a high-strength mold is used, the mold shell after demolding can be directly fired without molding), after the mold or mold is fired, molten metal is poured into it to obtain a casting.

The dimensional accuracy of investment castings is relatively high, generally reaching CT4-6 (CT10~13 for sand casting and CT5~7 for die casting). Of course, due to the complex process of investment casting, there are many factors that affect the dimensional accuracy of castings, such as mold The shrinkage of the material, the deformation of the investment mold, the linear change of the shell during the heating and cooling process, the shrinkage rate of the alloy, and the deformation of the casting during the solidification process, etc., so the dimensional accuracy of ordinary investment castings is high, but its Consistency still needs to be improved (castings with medium and high temperature waxes are much more dimensionally consistent).

When pressing the investment mold, a mold with a high surface finish of the cavity is used, so the surface finish of the investment mold is also relatively high. In addition, the shell is made of high temperature-resistant special binder and refractory paint prepared from refractory materials, which is coated and hung on the investment mold, and the inner surface of the cavity that is in direct contact with the molten metal has a high smoothness. Therefore, the surface finish of investment castings is higher than that of general castings, generally reaching Ra.1.6~3.2μm.

The biggest advantage of investment casting is that investment castings have high dimensional accuracy and surface finish, so machining work can be reduced, just leave a little machining allowance on parts with higher requirements, and even some castings only Leave grinding, polishing allowance, can be used without machining. It can be seen that the use of investment casting method can save a lot of machine tool equipment and processing time, and greatly save metal raw materials.

Another advantage of the investment casting method is that it can cast complex castings of various alloys, especially superalloy castings. For example, the blade of a jet engine has a streamlined outline and an inner cavity for cooling, which can hardly be formed by machining. The investment casting process can not only achieve mass production and ensure the consistency of castings, but also avoid the stress concentration of residual knife lines after machining.

Product Category

Lost wax casting of metal pipe fittings can be divided into: hardware tools, hardware accessories, construction hardware, daily hardware, locks and abrasives, kitchen and bathroom hardware, furniture hardware, hardware materials, welding materials for welding machines, electrical appliances, wires and cables , Lighting appliances, instrumentation, security equipment and supplies, mechanical and electrical equipment, mechanical equipment and hardware materials.

1. Hardware tools: refers to the general term for various metal devices made of iron, steel, aluminum and other metals through physical processing such as forging, rolling, and cutting. There is a wide range and numerous products, which are divided into 12 major categories according to use and material category.

Hardware tools include various manual, electric, pneumatic, cutting tools, auto maintenance tools, agricultural tools, lifting tools, measuring tools, tool machinery, cutting tools, fixtures, knives, molds, cutting tools, grinding wheels, drills, polishing machines, Tool accessories, measuring tools and cutting tools, abrasives, etc.

2. Hardware accessories: Hardware accessories refer to machine parts or components made of hardware, as well as some small hardware products. It can be used alone or as an aid. Such as hardware tools, hardware parts, daily hardware, construction hardware and security supplies. Most hardware products are not final consumer goods. Instead, it is used as ancillary products for industrial manufacturing, semi-finished products, and tools used in the production process. Only a small number of daily hardware products (accessories) are tool consumer goods that people must live with.

3. Architectural hardware: architectural hardware is the general term for metal and non-metallic products and accessories used in buildings or structures. Generally, it has a dual effect of practicality and decoration.

4. Daily hardware: Daily hardware is a hardware product used in daily life such as eating, wearing, living, and using. Made of metal materials. Pots, pots, knives, scissors, needles, oil lamps, etc. made of iron and bronze are the daily hardware product system.

5. Kitchen and bathroom hardware: including rice tubes, metal baskets, hinges, slide rails, aircraft hinges, handles

6. Furniture hardware: Furniture hardware refers to the hardware components of hardware furniture or the sliding rails, hinges, sofa feet, lifters, backrest frames, springs, gun nails, foot codes, connections, activities, and fastenings used on furniture. , pull basket, decoration and other functions of metal parts, also known as furniture accessories. As early as the Spring and Autumn Period and the Warring States Period in China, there were copper hinges for cabinets, corners for lacquer cases, gold-plated copper pieces for feet, and copper case rings.

7. Hardware materials: including non-ferrous metals, steel, tape, etc.

8. Electrical and electrical: including various low and high voltage switches, electrical appliances, communication equipment, etc.

9. Lighting appliances: including lighting appliances, lamps, etc.

10. Security equipment and supplies: including labor insurance, security equipment, etc.

11. Electromechanical equipment: motors, generators, etc.

12. Mechanical equipment and hardware materials: various machine tools, construction machinery, various processing machinery, conveyor belts, etc.

Post Casting Process

1. Heat treatment: annealing, carbonization, tempering, quenching, normalizing, surface tempering

2. Processing equipment: CNC, WEDM, lathe, milling machine, drilling machine, grinder, etc.;

3. Surface treatment: powder spraying, chrome plating, painting, sandblasting, nickel plating, galvanizing, blackening, polishing, bluing, etc.

Moulds and Inspection Fixtures

1. Mold service life: usually semi-permanent. (except for lost foam).

2. Mold delivery time: 10-25 days, (according to product structure and product size).

3. Tooling and mold maintenance: Zhongwei is responsible for precision parts.

Quality Control

1. Quality control: the defective rate is less than 0.1%.

2. Samples and trial run will be 100% inspected during production and before shipment, sample inspection for mass production according to ISDO standards or customer requirements

3. Testing equipment: flaw detection, spectrum analyzer, golden image analyzer, three-coordinate measuring machine, hardness testing equipment, tensile testing machine;

4. Provide after-sales service.

5. The quality can be traced back.

Application

Hardware accessories refer to the use of hardware to make machine parts or components and some hardware products solely used as auxiliary tools. Hardware products such as hardware tools, hardware components, general hardware, construction hardware and security products are ultimately consumed as industrial manufacturing supporting products and semi-finished products. and labor tools, etc.

Hardware accessories are complex, only in the industry accessories have actually involved various needs of all walks of life: kitchen hardware accessories, furniture hardware accessories and so on.

Hardware accessories:

Hardware accessories: handles, doors and windows, home decoration, plumbing, construction, decoration, tools, bathroom, kitchen, home appliances.

Furniture hardware accessories: wood screws, hinges, handles, slides, partition pins, hanging parts, nails, punching machines, tooth rolling machines, workstation machines.

Cabinet hardware accessories: hinges, drawers, guide rails, steel drawers, pull baskets, hangers, sinks, pull baskets, spotlights, skirting boards, cutlery trays, hanging cabinet pendants, functional columns, cabinet body combiners.

Mold hardware accessories: punching needle, punching, guide post, guide sleeve, thimble, cylinder, steel ball sleeve, ball sleeve, cage, outer guide post, independent guide post, self-lubricating plate, self-lubricating guide sleeve, oil supply guide sleeve , oil supply slide plate, outer guide column assembly

Marine hardware accessories: shackles, turnbuckles, clips, swivels, rings, pulleys, cable bolts, pipe bases, fairleads, bollards.

Clothing hardware accessories: buttons, wire buckles, hook buckles, claw nails, rope buckles, pin buckles, military buckles, zippers, five-claw buttons, buttons, rope loops, shaped buckles, glue buckles, stone buckles, zippers , Belt buckle, empty nail, alloy buckle, alloy pull card. .

Luggage hardware accessories: rivets, aluminum bars, chains, steel rings, buttons, rings, snap buttons, mushroom nails, empty nails, wire rings, backpack racks, triangular rings, pentagonal rings, three-section rivets, luggage handles.

Door and window hardware accessories: handrails, handles, hinges, latches, handles, hinges, wind braces, pulleys, door flowers, throat hoop, lock boxes, touch beads, crescent locks, point locks, transmitters, lifters, door locks device, glass glue, Samsung lock

Photo frame hardware accessories: hooks, shrapnel, blades, painting brackets, feet, brackets, pressing sheets, corner wrapping, straight nails, corner flowers, corner machines, code nails, corner nails, flannel.

Metal stamping accessories: flat gasket, disc, spring, shrapnel, cover, shell, sign, nameplate, marking, wire, fork, end, stamping part, pull arm, T-plate.

Curtain wall hardware accessories: hanging clips, rigging, AB glue, connecting claw, curtain wall claw, glass claw, connecting, glass clip, glass glue, marble glue, foam strip, planting glue, adapter, dry pendant, Railings, bolts, glass curtain walls, non-standard products.

General hardware accessories: valves, bearings, springs, pulleys, casters, pipe clamps, idlers, shackles, nozzles, sprays, hooks, grapples, steel balls, balls, clamps, hoops, bearing bushes, rigging, rollers, Universal wheel, oil seal, etc.

Hardware Silica Sol Investment Casting is used in many fields.