Cast-iron examine platform casts medium quality to control detail

Flat of cast-iron riveting solder uses casting pig normally or nodular cast iron undertakes casting. Grey iron is called be pregnant with is cast-iron, its with low cost, good damping sex, wearability, mechanical function and in casting function to be applied extensively at casting an industry. Want to use what casting pig obtains qualification to cast blank, must pass grind arenaceous - modelling - fusion - pouring - clear - the numerous link such as the examination, want to make sure the quality of cast must have controlled each segment in casting a process. 1.

Examine the quality that platform casts the controls molding sand function that grinds arenaceous process to will affect cast directly, accordingly, molding sand should have good permeability, wet intensity, fluidity, plasticity and concede sex. Wet molding sand should use granuality to be in of 55/100, 75/150, 100/200 polygonal or natural stone of the circle is arenaceous, the exterior strength with can be obtained better so and fight clip arenaceous sex. When argillaceous content is identical, the hot Shi Lajiang that Peng embellish earth compares common clay is spent tall. In wet model right amount coal fines, wood chip is joined to wait in clay-bonded sand, can rise fight clip arenaceous ability, can prevent clip arenaceous, stick arenaceous and receive the cast with bright and clean surface. The moisture of molding sand is 6 ％ to control surely, in order to make its have better integral performance. Strict according to order of feed in raw material: Floor sand - new arenaceous - clay - coal fines - water. Mix grind time to be in surely 6 ～ 7min, mix after grinding, undertake 5h is controlled agreement smooth. The sift out of smooth and junior travel, reoccupy after hitting a pine, make molding sand has inattentive sex, wait in order to increase permeability, liquidity. 2.

Examine the control that platform casts fusion process produces casting pig when, must control person furnace and the quality that the person includes material strictly, to its composition, piece degree reach manage to change function to must undertake check and be checkinged and accept by the requirement. Be pregnant with is cast-iron the casting pig that is a kind of flake graphite, just make a principle be the same as common and cast-iron different, increased process of be pregnant with. Agent of the person's right amount be pregnant with is added in the molten iron of component of low carbon, silicon, in order to restrain its excessive graphitization. Generally speaking, the quantity containing carbon of raw molten iron is in 2.

8 ～ 3.

Between 0 ％ , because be pregnant with is cast-iron,contain carbon inferior, the useless steel that measures with person sufficient sufficient in quantity is being increased in charging more. The content of silicon is in 0.

9 ～ 1.

Between 5 ％ , so that increase the amount adding a person of agent of be pregnant with, in order to improve casting machine performance. Contain quantity of sulfur, manganese to be in respectively 0.

08 ～ 0.

12 ％ and 0.

9 ～ 1.

When 2 ％ limits, if contain manganese the quantity is exorbitant, cast-iron medium an occurrence cementite. The quantity that contain phosphor is less than 0.

12 ％ , if its content is high, can affect cast intensity. 3.

Examine the control of control molding process that platform casts molding process is the crucial course that builds cast, affect the quality of cast directly. Basically note the following respects: 1) about: About is to cast the tooling with main production, also be the first working procedure that casts production, in assure geometrical dimension while. Also should consider scale of production to reach use convenient sex. What want a consideration above all in the process that make is its craft structure and function. Improve productivity on one hand, want to assure quality on the other hand. Using the integrality that about should examine in the process, assure flawless use. If have,blemish should pass the ability after repairing to be used quite. Knock strength should notice when having a model, aluminous model should fill up block to have beat, reduce the damage rate of aluminous model. The technology with sound 2) : Handlers should undertake strictly operating by process, all previous begs cast structure to make about is made go to the lavatory simply, make cent face amount little, have unplug modular rake, arenaceous core amount wants little, have reasonable wall thick, joint should have transfer. Select sound gating system, make cast order caky, in order to receive the cast with even organization. 3) closes case: Closing case is an important segment that cannot ignore, the float of casting mould surface is arenaceous should clear clean, be opposite by impress close, notice complex case is measured, it is to reduce cast to slant the important step of box. 4) issues core: Want when next core smooth, clear float is arenaceous. The position of arenaceous core should have been placed slant in case the generation of core. 5) drying: To doing craft of modular model drying, want to undertake operating by operating rules, stoving time is 8h above, be not appeared because of stoving in case and cause the defect such as arenaceous, stoma. 4.

Examine platform is cast pouring the preparation that the control of the process carries above segment, can undertake pouring. Pouring before should undertake to casting water be pregnant with is mixed gather up broken bits processing. In pouring should flow ceaselessly in the process, smooth, rush in order to avoid arenaceous and form sand holes. Run want to stem in time when fire the place of leakage casting water, water of complemental casting, in order to decrease cold lie between, irrigate the blemish such as inadequacy. 5.

Examine cast-iron flat is cast clear the control of the process clears the process is cast clear from inside casting mould after refrigeration cast, in order to win the cast with flawless surface. 1) falls arenaceous: Cast must gather up through sufficient cooling ability a casting mould, general requirement is not less than 3h. If time is too short, can produce the surface to stimulate cold and it is difficult to make hardness causes cutting higher. Internal stress of hot tearing, cast may arise when cast is bigger bigger, easy cause be out of shape and affect cast over all dimension. 2) Qing Dynasty is arenaceous: Should gain the face bright and clean the cast that has spent, little work the sand that can pass surface of tumbling barrel purify. Live greatly a sand that undertakes bolus handles purify appearance casting. Be not those who machine the surface to stick arenaceous must clear clean, bearing is entered in order to prevent after when loading the motion inside finished product, falling off indoor, to bearing use cause undesirable effect. 3) ageing treatment: General cast should have ageing treatment, acquire good property in order to reduce cast internal stress. 4) examines the control of the process: Through examining, the blemish of feedback cast, search and analyse a reason, take step in time, in order to reduce the generation of cast blemish. CNC Milling