Forging strengthening and shaping process for nodular iron castings

A technology for ductile iron and iron castings, applied in the field of forging, can solve the problems of complex casting process control, infeasible forging process, shrinkage holes, etc., and achieve the effect of eliminating internal defects and reducing machining costs.

Active Publication Date: 2021-02-05
SHANDONG GUOMING DUCTILE IRON PIPES TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ductile iron is a high-strength cast iron material with higher strength than carbon steel. Therefore, casting is generally used to produce ductile iron parts in industry. However, the shape accuracy and dimensional accuracy of the products manufactured by the casting process are low, and the casting process control is complex. Casting Products generally have unavoidable defects, mainly shrinkage cavities, shrinkage porosity, etc., which affect the casting yield
[0003] The forging process is to use forging press

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027]Example 1

[0028]Step 1. The ductile iron castings are demoulded directly at about 300°C after casting;

[0029]Step 2. Put the nodular cast iron after demolding in step 1 into a heating furnace, and after heating to 850°C, insert it into a closed forging die sprayed with mold release agent for forging to strengthen the shape with a deformation of 5%, and hold the pressure for 1.5 minutes , The mold release agent is a Mg-containing mold release agent, which is made by adding magnesium powder to the boron nitride-graphite colloidal mold release agent (graphite content ≤30%). The magnesium powder is added to the Mg-containing mold release agent The amount is 5%;

[0030]Step 3. After the pressure holding is over, the mold is opened and the ductile iron parts are taken out;

[0031]Step 4. Annealing the ductile iron castings.

Example Embodiment

[0032]Example 2

[0033]Step 1. The ductile iron castings are demoulded at about 300℃ directly after casting;

[0034]Step 2. Put the nodular cast iron after demolding in step 1 into a heating furnace, heat it to 950°C, insert it into a closed forging die sprayed with mold release agent, and carry out forging strengthening and shaping with a deformation of 8%, and hold for 1.5 min , The mold release agent is a Mg-containing mold release agent, which is made by adding magnesium powder to the boron nitride-graphite colloidal mold release agent (graphite content ≤30%). The magnesium powder is added to the Mg-containing mold release agent The amount is 7%;

[0035]Step 3. After the pressure holding is over, the mold is opened and the ductile iron parts are taken out;

[0036]Step 4, annealing the nodular cast iron.

Example Embodiment

[0037]Example 3

[0038]Step 1. The ductile iron castings are demoulded at about 300℃ directly after casting;

[0039]Step 2. Put the nodular cast iron after demolding in step 1 into a heating furnace, and after heating to 1050°C, insert it into a closed forging die sprayed with mold release agent for forging strengthening and shaping with a deformation of 10%, and hold the pressure for 1.5 minutes , The mold release agent is a Mg-containing mold release agent, which is made by adding magnesium powder to the boron nitride-graphite colloidal mold release agent (graphite content ≤ 30%), and the magnesium powder is added to the Mg-containing mold release agent The amount is 7%;

[0040]Step 3. After the pressure holding is over, the mold is opened to take out the ductile iron parts;

[0041]Step 4. Annealing the ductile iron castings.

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PUM

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Abstract

The invention discloses a forging strengthening and shaping process for nodular iron castings. The forging strengthening and shaping process for the nodular iron castings comprises the following stepsthat the cast nodular iron castings are heated to the temperature of 800 DEG C or above, forging strengthening and shaping with the deformation not lower than 1% and not larger than 15% is conductedin a closed forging die sprayed with a release agent, a nodular iron casting part blank is obtained through a casting process, a forging process is used for carrying out final near-net shaping on thepart blank, the machining cost can be reduced, the nodular cast iron part can be further compactly reinforced, internal defects are eliminated, by reasonably controlling the forging deformation amountand release agent components, it is guaranteed that spherical graphite inside the nodular cast iron part does not deform, the surface nodular cast iron structure does not degrade, at a higher forgingtemperature, the internal performance is not reduced, and the surface strength and corrosion resistance are not reduced.

Description

technical field [0001] The invention relates to the technical field of forging, in particular to a forging strengthening and setting process for ductile iron castings. Background technique [0002] Ductile iron is a high-strength cast iron material with higher strength than carbon steel. Therefore, casting is generally used to produce ductile iron parts in industry. However, the shape accuracy and dimensional accuracy of the products manufactured by the casting process are low, and the casting process control is complex. Casting Products generally have unavoidable defects, mainly shrinkage cavities, shrinkage porosity, etc., which affect the yield of castings. [0003] The forging process is to use forging pressure processing equipment to apply pressure to the metal blank to cause plastic deformation to obtain forgings with a certain shape and size. In forging, the internal defects of the product are eliminated, the grains are refined, and the mechanical properties are impro...

Claims

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Application Information

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IPC IPC(8): C21D7/13C21D5/00
CPCC21D7/13C21D5/00
Inventor 张希营孙昌智柴成林王浩方素娥张学来
Owner SHANDONG GUOMING DUCTILE IRON PIPES TECH CO LTD
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