CN105964912A

CN105964912A - Crankshaft casting technology

Info

Publication number: CN105964912A
Application number: CN201610538173.8A
Authority: CN
Inventors: 娄土岭
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-06-30
Filing date: 2016-06-30
Publication date: 2016-09-28

Abstract

The invention relates to a crankshaft casting technology. The technology comprises following steps of sand mixing, wherein resin sand is adopted as a raw material; modeling, wherein resin is used for manufacturing a sand mould, and a chilling block is embedded and placed in a casting mould; melting, wherein the raw material is put into an electric furnace to be heated to the melting temperature, and after the temperature rises to 1500 DEG C to 1600 DEG C, a refining agent is added for refining, molten steel is obtained, and an alloy is fully melted to form molten iron; casting, the molten iron is poured into a sprue in the resin sand mould, and after solidification, a crankshaft casting is formed; cooling, wherein the casting is cooled to the room temperature, the casting is taken out to form a crankshaft, and the surface of the crankshaft is cleaned; forging, wherein after cooling is completed, a mould box is opened, the casting is taken out, and the casting is cleaned and then forged; and machining, wherein a forge piece obtained after forging is placed on a lathe to be turned. The technology has the beneficial effects of being reasonable in working procedure, easy to operate, stable in work, high in production efficiency, high in product yield and good in molding quality, and saving raw materials and cost.

Description

A kind of crankshaft casting technique

Technical field

The invention belongs to casting technology field, be specifically related to a kind of crankshaft casting technique.

Background technology

Casting is a kind of ancient manufacture method, before China can trace back to 6000, along with the development of industrial technology, The quality of heavy castings directly affects the quality of product, therefore, is cast in machinery manufacturing industry and occupies an important position, casting The development of technology the most rapidly, owing to now castability, casting accuracy, casting cost and requirement such as casting automatization etc. being carried Height, foundry engieering develops towards precise treatment, maximization, high-quality, automatization and the direction cleaned, and such as China these several years exists Precision casting technology, continuous foundry engieering, Special Processes of Metal Castings technology, the casting aspect such as automatization and casting simulation technology development Rapidly, bent axle is the strength member in electromotor, work under bad environment, for transportation diesel, bent axle Machining accuracy and toughness, requirement of strength is all high than general part, it is known that bent axle is one of important machine parts, its knot Structure and stress are complicated, and workload is big, require the highest to internal metallurgical material and castability and formed precision, current In the casting technique of bent axle, the finished product cast hardness made is inadequate, and not only casting process is more, affects production capacity, simultaneously foundry goods Precision cannot be effectively ensured, and percent defective is higher, therefore a kind of operation of design rationally, save material, cost-effective, operation Simply, working stability, production efficiency are high, conforming product rate high, Forming Quality is good crankshaft casting technique be necessary, For improving the production efficiency of bent axle and there is service life important effect.

Summary of the invention

The present invention provide for overcoming the deficiencies in the prior art a kind of operation rationally, save material, cost-effective, operation Simply, working stability, production efficiency is high, conforming product rate high, Forming Quality is good crankshaft casting technique.

The technical scheme is that a kind of crankshaft casting technique, described technique comprises the following steps:

Step one: mulling, employing resin sand is raw material, proportionally the molding sand of configuration casting, the one-tenth subpackage of resin sand Include the resin of 1.5%, the firming agent of 0.6% and molding sand；

Step 2: moulding, uses described resin to make sand mold, forms resin bonded sand mould, and making after joining mould mould assembling The axial line of the resin bonded sand mould of Shi Suoshu is paralleled with horizontal plane, and the axial line of described resin bonded sand mould is perpendicular with horizontal plane, Placement chill is inlayed in mold；

Step 3: melting, uses the method for smelting of the additional pre-desulfurization of duplex, uses cupola melting molten iron, is put by raw material In electric furnace, it is being heated to smelting temperature, after temperature rises to 1500～1600 DEG C, adds refining agent refine and obtain molten steel, make conjunction Gold fully fusing forms molten iron；

Step 4: cast, pours into a mould described molten iron in the cast gate in described resin bonded sand mould, form bent axle casting after solidification Part, pouring temperature controls at 1600～1700 DEG C, and the duration of pouring is one minute, when keeping the insulation of half an hour after casting complete Between；

Step 5: cooling, is cooled to room temperature, takes out the bent axle shaped, is carried out the surface of bent axle；

Step 6: forging, after having cooled down, opens moulding box, takes out foundry goods, cleaned up by foundry goods, then forge；

Step 7: machining, the forging after having forged is placed on numerically controlled lathe and carries out turnery processing；

Step 8: heat treatment, uses normalized treatment, uses quenching technical to carry out surface peening after normalized treatment.

The constituent of described molding sand be 8% the graphite powder of the graphite powder of bentonite, 8～10%, 8～10%, 2～ The water of the stalk powder of plant ash, 2～4%, 10～15% of 5%, remaining is calcite sand.

Described sculpting method is air-impulse moulding.

The thickness of described chill is the 1/3～1/2 of automatic modeling crankshaft casting wall thickness.

The composition of described molten iron is, 1～the nickel of the silicon of the carbon of 1.5%, 0.1～0.2%, 0.4～0.6%, 0.6% Manganese, the boron of 0.15%, the sulfur of 0.06%, the copper of 0.7%, 0.05～the magnesium of 0.06%, remaining is ferrum.

There was added refining agent in described molten iron, refining agent is 1: 60 with the ratio of molten iron.

The invention has the beneficial effects as follows: the resin of the 1.5% of present invention employing, the resin sand of the firming agent composition of 0.6% As molding sand, Forming Quality is good；Employing gas shock causes, and quickly and easily, Forming Quality is good in moulding；Placement is inlayed in mold Chill, the thickness of chill is the 1/3～1/2 of automatic modeling crankshaft casting wall thickness, effectively reduces the loss of runner system, improves Forming Quality； The composition of molten iron is, 1～the nickel of the silicon of the carbon of 1.5%, 0.1～0.2%, 0.4～0.6%, the manganese of 0.6%, the boron of 0.15%, The sulfur of 0.06%, the copper of 0.7%, 0.05～the magnesium of 0.06%, remaining is ferrum, improves intensity and the service life of bent axle；This Bright have operation rationally, save material, cost-effective, simple to operate, working stability, production efficiency high, conforming product rate is high, The advantage that Forming Quality is good.

Detailed description of the invention

Embodiment 1

A kind of crankshaft casting technique, described technique comprises the following steps:

Step 7: machining, the forging after having forged prevents from carrying out on lathe turnery processing；

Embodiment 2

Described sculpting method is air-impulse moulding.

The composition of described molten iron is 1～the nickel of the silicon of the carbon of 1.5%, 0.1～0.2%, 0.4～0.6%, 0.6% Manganese, the boron of 0.15%, the sulfur of 0.06%, the copper of 0.7%, the magnesium of 0.05-0.06%, remaining is ferrum.

The resin of the 1.5% of present invention employing, the resin sand of the firming agent composition of 0.6% is as molding sand, and Forming Quality is good； Employing gas shock causes, and quickly and easily, Forming Quality is good in moulding；Inlaying placement chill in mold, the thickness of chill is bent The 1/3～1/2 of axle casting section thickness, effectively reduces the loss of runner system, improves Forming Quality；The composition of molten iron is, 1～ The nickel of the silicon of carbon, 0.1～0.2%, 0.4～0.6% of 1.5%, the manganese of 0.6%, the boron of 0.15%, the sulfur of 0.06%, 0.7% The magnesium of copper, 0.05～0.06%, remaining is ferrum, improves intensity and the service life of bent axle；The present invention have operation rationally, joint About raw material, cost-effective, simple to operate, working stability, production efficiency are high, conforming product rate is high, Forming Quality is good advantage.

Claims

1. a crankshaft casting technique, it is characterised in that: described technique comprises the following steps:

Step one: mulling, employing resin sand is raw material, proportionally the molding sand of configuration casting, and the composition of resin sand includes The resin of 1.5%, the firming agent of 0.6% and molding sand；

Step 2: moulding, uses described resin to make sand mold, forms resin bonded sand mould after joining mould mould assembling, and in making time institute The axial line of the resin bonded sand mould stated is paralleled with horizontal plane, and the axial line of described resin bonded sand mould is perpendicular with horizontal plane, in casting Placement chill is inlayed in mould；

Step 3: melting, uses the method for smelting of the additional pre-desulfurization of duplex, uses cupola melting molten iron, is placed on by raw material It is heated to smelting temperature in electric furnace, after temperature rises to 1500～1600 DEG C, adds refining agent refine and obtain molten steel, make alloy fill Fractional melting forms molten iron；

Step 4: cast, pours into a mould described molten iron in the cast gate in described resin bonded sand mould, form automatic modeling crankshaft casting after solidification, Pouring temperature controls at 1600～1700 DEG C, and the duration of pouring is one minute, keeps the temperature retention time of half an hour after casting complete；

Step 7: machining, the forging after having forged is placed on lathe and carries out turnery processing；

2. a kind of crankshaft casting technique as claimed in claim 1, it is characterised in that: the composition of described molding sand is divided into 8% The water of the stalk powder of the plant ash of the graphite powder of bentonite, 8～10%, 2～5%, 2～4%, 10～15%, remaining side of being Solve stone sand.

3. a kind of crankshaft casting technique as claimed in claim 1, it is characterised in that: described sculpting method is that gas shock is made Type.

4. a kind of crankshaft casting technique as claimed in claim 1, it is characterised in that: the thickness of described chill is automatic modeling crankshaft casting The 1/3～1/2 of wall thickness.

5. crankshaft casting technique as claimed in claim 1 a kind of, it is characterised in that: the composition of described molten iron is, 1～ The nickel of the silicon of carbon, 0.1～0.2%, 0.4～0.6% of 1.5%, the manganese of 0.6%, the boron of 0.15%, the sulfur of 0.06%, 0.7% The magnesium of copper, 0.05～0.06%, remaining is ferrum.

6. such as claim 1 crankshaft casting technique, it is characterised in that: there was added refining agent, refining agent in described molten iron It is 1: 60 with the ratio of molten iron.