CN107052226A

CN107052226A - A kind of end cap casting technique

Info

Publication number: CN107052226A
Application number: CN201710420890.5A
Authority: CN
Inventors: 孔晓静
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-06-07
Filing date: 2017-06-07
Publication date: 2017-08-18

Abstract

The present invention relates to a kind of end cap casting technique, described technique comprises the following steps：Mulling, uses resin sand for raw material, proportionally configures the molding sand of casting；Molding, makes end cover die according to the size shape of end cap, mould is placed on to the inside of molding sand box, end cover die sand mold is obtained；Melting, raw material is placed in electric furnace and is heated to smelting temperature, is added refining agent refining, is made alloy fully melt to form molten iron；Cast, molten iron is poured into sand mold by the sprue gate of the rapid two end cover die sand molds manufactured；Cooling, is cooled to normal temperature；Cleaning, after the completion of cooling, opens moulding box, takes out the end cap of shaping, end cover surface is cleaned up and is processed by shot blasting；Heat treatment, is carried out after Quenching Treatment, Quenching Treatment to end cap using tempering process progress surface peening；Have the advantages that process is reasonable, save material, cost-effective, simple to operate, working stability, production efficiency are high, product qualification rate is high, Forming Quality is good.

Description

A kind of end cap casting technique

Technical field

The invention belongs to casting technology field, and in particular to a kind of end cap casting technique.

Background technology

Casting is a kind of ancient manufacture method, with the development of industrial technology, and the quality of casting heavy castings is directly affected The quality of product, therefore, be cast in machinery manufacturing industry and occupy an important position, the development of foundry engieering also rapidly, In heavy mechanical equipment, end cap is one of most commonly seen part, the casting technique of end cap, be by molten iron casting into sand mold, Casting is obtained after cooling, and due to the characteristic of iron casting, cooled and solidified is that it is fast that outside is cooled down externally to solidified inside, Internal cooling it is slow, after cooled and solidified process, easily making the wall thickness part of casting becomes loose, produce discard, in addition, existing The smelting technology and pouring technology of end cap casting are more unreasonable, cause casting in the property such as tensile strength, elongation percentage and yield strength Can on it is more unsatisfactory, common molding sand it is main by roughing sand, be stained with class binding agent, water and coal dust etc. and constitute, it is often not Can have the above-mentioned requirement to molding sand well, because of the poor quality of molding sand and caused by casting wasted product ratio compare Greatly, not enough, not only casting process is more for the finished product cast hardness being made, and production capacity is influenceed, while the precision of casting can not be had Effect ensures that percent defective is higher, thus design a kind of process rationally, save material, pour into a mould uniform, simple to operate, working stability, The end cap casting technique that production efficiency is high, product qualification rate is high, Forming Quality is good is necessary, for improving end cap Production efficiency and service life have important effect.

The content of the invention

A kind of process is reasonable, save material, pour into a mould uniform, operation to overcome the deficiencies in the prior art to provide by the present invention Simply, working stability, production efficiency height, the end cap casting that obtained product surface is smooth, product qualification rate is high, Forming Quality is good Technique.

The technical scheme is that：A kind of end cap casting technique, described technique comprises the following steps：

Step one：Mulling, uses resin sand for raw material, proportionally configures the molding sand of casting；

Step 2：Molding, makes end cover die according to the size shape of end cap, mould is placed on to the inside of molding sand box, held Box cover die sand mold；

Step 3：Melting, raw material is placed in electric furnace and is heated to smelting temperature, 1300 are reached when the temperature in smelting furnace~ At 1400 DEG C, refining agent refining is added, makes alloy fully melt to form molten iron；

Step 4：Cast, the molten iron that step 3 is obtained is poured into sand by the sprue gate of the rapid two end cover die sand molds manufactured In type；

Step 5：Cooling, is cooled to normal temperature；

Step 6：Cleaning, after the completion of cooling, opens moulding box, takes out the end cap of shaping, end cover surface is cleaned up and thrown Light processing；

Step 7：Heat treatment, the end cap obtained to step 6 is carried out after Quenching Treatment, Quenching Treatment using tempering process progress table Surface strengthening.

The constituent of molding sand in described step one is：5~10 parts of resin, 15~20 parts of water, bentonite 15~20 Part, 10~15 parts of waterglass, 5~10 parts of ends of graphite powder, 3~5 parts of silicone oil, remaining is calcite sand.

Smelting temperature in described step three is 1600~1700 DEG C,.

Pouring temperature control in described step four is at 1600~1800 DEG C, and the duration of pouring is 30 seconds, after casting complete Insulation 30 minutes.

The composition of described molten steel is, 1~2% carbon, 0.1~0.2% silicon, 0.5~0.8% nickel, 0.4~0.6% Manganese, 0.15~0.3% boron, 0.03~0.06% sulphur, 0.4~0.7% copper, 0.05~0.06% magnesium, remaining is iron.

The addition of refining agent in described step three is the 0.6~1% of Metal Weight.

Sprue gate in described step four is internally provided with Honeycombed filtering sieve.

The beneficial effects of the invention are as follows：15~20 parts of 15~20 parts of 5~10 parts of resin, water, bentonite that the present invention is used, 10~15 parts of waterglass, 5~10 parts of ends of graphite powder, 3~5 parts of silicone oil, remaining be calcite sand as molding sand, Forming Quality is good, End cap is cleaned out conveniently；Caused using gas shock, moulding is quick and easy, and Forming Quality is poured into a mould well uniformly, in casting process The bubble of generation is few, improves the quality of end cap, reduces waste product；Placement chill is inlayed in mold, the thickness of chill is cast for bent axle The loss of the 1/3~1/2 of part wall thickness, effectively reduction runner system, improves Forming Quality；The composition of water is, 1~2% carbon, 0.1~0.2% silicon, 0.5~0.8% nickel, 0.4~0.6% manganese, 0.15~0.3% boron, 0.03~0.06% sulphur, 0.4 ~0.7% copper, 0.05~0.06% magnesium, remaining is iron, improves the intensity and hardness of end cap, and service life is long；Sprue gate Honeycombed filtering sieve is internally provided with, cast is uniform, and obtained product surface is smooth, improves the Forming Quality of product；The present invention With process rationally, save material, cost-effective, simple to operate, working stability, production efficiency are high, product qualification rate high, into The measured advantage of type matter.

Embodiment

Embodiment 1

Step 5：Cooling, is cooled to normal temperature；

10~15 parts of 15~20 parts of 15~20 parts of 5~10 parts of resin, water, bentonite, waterglass, graphite that the present invention is used 5~10 parts of ends of powder, 3~5 parts of silicone oil, remaining be calcite sand as molding sand, Forming Quality is good, end cap clean out conveniently；Adopt Caused with gas shock, moulding is quick and easy, and Forming Quality is poured into a mould well uniformly, and the bubble produced in casting process is few, improve end The quality of lid, reduces waste product；Placement chill is inlayed in mold, the thickness of chill is the 1/3~1/2 of automatic modeling crankshaft casting wall thickness, is had The loss of effect reduction runner system, improves Forming Quality；The composition of water is, 1~2% carbon, 0.1~0.2% silicon, 0.5~ 0.8% nickel, 0.4~0.6% manganese, 0.15~0.3% boron, 0.03~0.06% sulphur, 0.4~0.7% copper, 0.05~ 0.06% magnesium, remaining is iron, improves the intensity and hardness of end cap, and service life is long；Sprue gate is internally provided with cellular mistake Filter screen, cast is uniform, and obtained product surface is smooth, improves the Forming Quality of product；The present invention have process rationally, save former The advantage that material, cost-effective, simple to operate, working stability, production efficiency are high, product qualification rate is high, Forming Quality is good.

Embodiment 2

Step 5：Cooling, is cooled to normal temperature；

Smelting temperature in described step three is 1600~1700 DEG C,.

Claims

1. a kind of end cap casting technique, it is characterised in that：Described technique comprises the following steps：

Step 5：Cooling, is cooled to normal temperature；

2. a kind of end cap casting technique as claimed in claim 1, it is characterised in that：The composition of molding sand in described step one Composition is：5~10 parts of resin, 15~20 parts of water, 15~20 parts of bentonite, 10~15 parts of waterglass, 5~10 parts of ends of graphite powder, 3~5 parts of silicone oil, remaining is calcite sand.

3. a kind of end cap casting technique as claimed in claim 1, it is characterised in that：Smelting temperature in described step three is 1600~1700 DEG C,.

4. a kind of end cap casting technique as claimed in claim 1, it is characterised in that：Pouring temperature control in described step four System is at 1600~1800 DEG C, and the duration of pouring is 30 seconds, and 30 minutes are incubated after casting complete.

5. a kind of end cap casting technique as claimed in claim 1, it is characterised in that：The composition of described molten steel is, 1~2% Carbon, 0.1~0.2% silicon, 0.5~0.8% nickel, 0.4~0.6% manganese, 0.15~0.3% boron, 0.03~0.06% sulphur, 0.4~0.7% copper, 0.05~0.06% magnesium, remaining is iron.

6. a kind of end cap casting technique as claimed in claim 1, it is characterised in that：Refining agent in described step three plus It is the 0.6~1% of Metal Weight to enter amount.

7. a kind of end cap casting technique as claimed in claim 1, it is characterised in that sprue gate in described step four it is interior Portion is provided with Honeycombed filtering sieve.