How does casting cast iron choose the right cutting fluid?
How does casting cast iron choose the right cutting fluid?
The definition of chilled cast iron
Chilled cast iron is placed in the mold cold iron to speed up the casting cooling rate and get, also known as chilled cast iron. With the cold iron in contact with the cast iron surface layer due to the cooling rate is faster, so the cast iron in a certain thickness of the white mouth, so the hardness is high, good wear resistance; and away from the cold iron deep parts, The resulting organization is gray; in the white and gray between the transition area was Ma mouth.
(B) the characteristics of chilled cast iron
1. External hard internal toughness, the surface part of the white mouth, hardness and wear resistance greatly improved, the internal still maintain the gray mouth tissue, to prevent the overall embrittlement.
2. Chilled cast iron for friction under the conditions of non-abrasive role of the parts, parts in addition to sliding also includes varying degrees of rolling motion. Requirements parts of the work surface has a higher hardness, good wear resistance, but also requires the workpiece has a high enough strength and toughness, it is generally used in the manufacture of rollers, wheels and other parts.
(C) cold cast iron difficult to process features:
1. Chilled cast iron is a typical hard and brittle material, the surface hardness is very high. Roughing, the unit cutting force of 3000MPa, a strong impact can easily lead to vibration, aggravating the wear of the tool.
2. Chilled cast iron with high hardness and high thermal strength. In particular, large, cutting tool for a long time, the tool temperature is very high, prone to deformation of the blade or welding blade welding phenomenon caused by the tool damage.
3. Chilled cast iron surface structure for the white mouth, the nature of hard and brittle, when the cutter cut or cut out, prone to collapse edge phenomenon, resulting in waste or damage to the tool.
4. Chilled cast iron is often used to make a variety of rolls, structural size, processing margin is also large, turning to use a larger depth of cutting and feed, the strength of the tool and process system requirements are higher rigidity.
(D) chilled cast iron cutting fluid choice:
1. Cast iron organization is uneven, the internal containing flake graphite and sand, in the water conditions are easy to form micro-batteries and rapid corrosion. Cast iron processing cast iron cutting fluid should not use more oil cutting fluid (such as emulsion cutting fluid), because the cast iron parts and chips in the graphite composition of the cast iron cutting fluid in the oil leaching, resulting in the actual concentration of cast iron cutting fluid , Easily lead to corrosion and corrosion of cast iron cutting fluid.
2. Cast iron processing and more produce broken chips, processing tool flank wear. Therefore, cast iron cutting fluid should be used for cooling and cleaning performance better water-based cutting fluid. Cast iron in the graphite has a certain role in lubrication, to a certain extent, make up for water-based cast iron cutting fluid lubrication shortcomings.
Cracking of cast iron will produce a large number of chip powder, easy with the cast iron cutting fluid in some chemical substances react and generate iron oxide, the impact of cast iron cutting fluid stability caused by deterioration. Therefore, the cast iron cutting fluid should have a better sedimentation and cleaning performance of the chip, at the same time, the machine should be equipped with chip separator and filter, in order to remove and remove the cast iron cutting fluid chips.
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The definition of chilled cast iron
Chilled cast iron is placed in the mold cold iron to speed up the casting cooling rate and get, also known as chilled cast iron. With the cold iron in contact with the cast iron surface layer due to the cooling rate is faster, so the cast iron in a certain thickness of the white mouth, so the hardness is high, good wear resistance; and away from the cold iron deep parts, The resulting organization is gray; in the white and gray between the transition area was Ma mouth.
(B) the characteristics of chilled cast iron
1. External hard internal toughness, the surface part of the white mouth, hardness and wear resistance greatly improved, the internal still maintain the gray mouth tissue, to prevent the overall embrittlement.
2. Chilled cast iron for friction under the conditions of non-abrasive role of the parts, parts in addition to sliding also includes varying degrees of rolling motion. Requirements parts of the work surface has a higher hardness, good wear resistance, but also requires the workpiece has a high enough strength and toughness, it is generally used in the manufacture of rollers, wheels and other parts.
(C) cold cast iron difficult to process features:
1. Chilled cast iron is a typical hard and brittle material, the surface hardness is very high. Roughing, the unit cutting force of 3000MPa, a strong impact can easily lead to vibration, aggravating the wear of the tool.
2. Chilled cast iron with high hardness and high thermal strength. In particular, large, cutting tool for a long time, the tool temperature is very high, prone to deformation of the blade or welding blade welding phenomenon caused by the tool damage.
3. Chilled cast iron surface structure for the white mouth, the nature of hard and brittle, when the cutter cut or cut out, prone to collapse edge phenomenon, resulting in waste or damage to the tool.
4. Chilled cast iron is often used to make a variety of rolls, structural size, processing margin is also large, turning to use a larger depth of cutting and feed, the strength of the tool and process system requirements are higher rigidity.
(D) chilled cast iron cutting fluid choice:
1. Cast iron organization is uneven, the internal containing flake graphite and sand, in the water conditions are easy to form micro-batteries and rapid corrosion. Cast iron processing cast iron cutting fluid should not use more oil cutting fluid (such as emulsion cutting fluid), because the cast iron parts and chips in the graphite composition of the cast iron cutting fluid in the oil leaching, resulting in the actual concentration of cast iron cutting fluid , Easily lead to corrosion and corrosion of cast iron cutting fluid.
2. Cast iron processing and more produce broken chips, processing tool flank wear. Therefore, cast iron cutting fluid should be used for cooling and cleaning performance better water-based cutting fluid. Cast iron in the graphite has a certain role in lubrication, to a certain extent, make up for water-based cast iron cutting fluid lubrication shortcomings.
Cracking of cast iron will produce a large number of chip powder, easy with the cast iron cutting fluid in some chemical substances react and generate iron oxide, the impact of cast iron cutting fluid stability caused by deterioration. Therefore, the cast iron cutting fluid should have a better sedimentation and cleaning performance of the chip, at the same time, the machine should be equipped with chip separator and filter, in order to remove and remove the cast iron cutting fluid chips.
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