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CN-122007337-A - Integrated casting method for steering yoke

CN122007337ACN 122007337 ACN122007337 ACN 122007337ACN-122007337-A

Abstract

The invention discloses an integrated casting method for a steering yoke, which belongs to the technical field of ball milling cast iron casting and comprises the following steps of S1 preparing a die sand mold for casting a steering yoke casting, S2 preparing molten metal for casting the steering yoke, pouring the molten metal into a riser cavity, entering a casting cavity through a riser neck and a reinforcing rib cavity for casting molding, S3 cooling the die sand mold for casting molding, taking out a casting in the die sand mold, S4 cutting and removing parts, corresponding to the riser cavity, the riser neck and the reinforcing rib cavity, on the taken-out casting, then performing shot blasting and polishing, integrally molding in a casting mode, improving the utilization rate of materials, and limiting the modulus of the riser cavity and the modulus of the riser neck by adding the reinforcing rib cavity, so that effective feeding can be realized during casting, and the quality of the final casting is ensured.

Inventors

  • YUE SHUAI
  • Yi Miansen
  • WANG YINGLIN

Assignees

  • 苏州石川制铁有限公司

Dates

Publication Date
20260512
Application Date
20260125

Claims (10)

  1. 1. An integrated casting method for a steering yoke, comprising the steps of: the method comprises the following steps of S1, preparing a die sand mold for casting a steering yoke casting, wherein the die sand mold comprises a riser cavity, a riser neck, a reinforcing rib cavity and a casting cavity which are sequentially communicated from top to bottom, the casting cavity comprises a yoke part cavity corresponding to a steering yoke part (1), a sleeve part cavity corresponding to a sleeve part (2) and a groove key part cavity corresponding to a groove key part (3), the reinforcing rib cavity is arranged on one side, away from the groove key part cavity, of the sleeve part cavity along the axial extending direction of the sleeve part cavity, and extends from the joint yoke part cavity and sleeve part cavity joint part to the sleeve part cavity and groove key part cavity joint part; S2, preparing molten metal for casting the steering yoke, pouring the molten metal into the riser cavity, and entering the casting cavity through a riser neck and a reinforcing rib cavity to mold a casting; s3, cooling the die sand mould after casting molding is completed, and then taking out castings in the die sand mould; and S4, cutting and removing the parts, corresponding to the riser cavity, the riser neck and the reinforcing rib cavity, of the cast, and then performing shot blasting and polishing on the cut cast to form the final steering yoke.
  2. 2. The integrated casting method for a steering yoke as claimed in claim 1, wherein the cross section of the rib cavity in the extending direction is rectangular, the minimum width in the rectangle is 7mm or more, and the riser cavity modulus is And (2) and Wherein Is the standard modulus coefficient of the ball-milling cast iron Is in the range of 0.8 to 1.0, For the reinforcing rib cavity modulus, the reinforcing rib cavity modulus Wherein For the volume of the casting corresponding to the casting cavity, The riser neck modulus is as follows, which is the surface area of the casting corresponding to the casting cavity And (2) and 。
  3. 3. The integrated casting method for a steering yoke, as set forth in claim 1, characterized in that Fe, C, si, mn, S, P is included in the molten metal, wherein the molten metal has a mass ratio of C of 3.7% -3.9%, a mass ratio of Si of 1.8% -2.4%, a mass ratio of Mn of 0.3% or less, a mass ratio of S of 0.015% or less, a mass ratio of P of 0.05% or less, and a residual mass ratio element of Fe.
  4. 4. The integrated casting method for a steering yoke as defined in claim 3, wherein the casting of the molten metal in the riser cavity through the riser neck and the reinforcing rib cavity into the casting cavity in the S2 specifically comprises: Pouring the molten metal into a spheroidizing ladle for spheroidizing, wherein the molten metal amount of each spheroidizing ladle is 800kg-1200kg, the adding amount of each spheroidizing ladle is 8kg-15kg, transferring the spheroidized molten metal from the spheroidizing ladle to a pouring ladle, and pouring the molten metal in the pouring ladle into a riser cavity to enter a casting cavity through a riser neck and a reinforcing rib cavity for casting molding when the molten metal temperature is 1330-1400 ℃.
  5. 5. The integrated casting method for a steering yoke as claimed in claim 4, wherein the molten metal is melted at 1480-1540 ℃.
  6. 6. The integrated casting method for a steering yoke according to claim 1, wherein the cooling of the mold sand mold for which casting molding is completed in S3 specifically comprises: And cooling the die sand mould after the casting is formed, wherein the cooling time is more than or equal to 1 hour.
  7. 7. The integrated casting method for a steering yoke according to claim 6, wherein the step of removing the casting from the mold sand mold in S3 comprises: And taking out the castings in the mould sand mould, wherein the taking-out temperature is less than or equal to 200 ℃.
  8. 8. The integrated casting method for a steering yoke, as set forth in claim 1, characterized in that the mold sand mold is manufactured by molding, the molding machine sand injection pressure is 0.2Bar-0.4Bar, the extrusion pressure is 8Bar-12Bar, and the target compaction ratio is 23% -30%.
  9. 9. The integrated casting method for the steering yoke, as set forth in claim 1, characterized in that the shot blasting is performed by a shot blasting machine, the shot blasting time of the shot blasting machine is 8-10 min, and the shot blasting diameter of the shot blasting machine is 1.2-1.8 mm.
  10. 10. An integrated casting method for a steering yoke as defined in claim 9, wherein said grinding grinds said casting to remove flash.

Description

Integrated casting method for steering yoke Technical Field The invention relates to the technical field of ball-milling cast iron casting, in particular to an integrated casting method for a steering knuckle. Background With the advanced development of the automobile industry in the direction of automation, intellectualization and light weight, automobile steering systems are facing higher technical requirements and performance challenges. In this context, there is a need for innovative manufacturing processes for steering yoke and sleeve assemblies in conventional steering systems. The existing mainstream technology adopts split type manufacturing, namely the yoke part is usually formed by forging, and has the limitations that the product is heavy and complex structural design is difficult to realize, and the sleeve part adopts a seamless steel tube. The two are finally assembled by a welding process. The integrated cast molding technique presents significant advantages over the traditional approach of "forging+welding" described above. The process can mold the open slot of the steering yoke, the spline bottom hole and the internal cavity designed for light weight at one time in one casting process. The technical path brings direct benefit improvement, the weight of a single blank can be greatly reduced to 0.5kg through technical optimization, and the material utilization rate is improved to more than 85%. However, since the thickness difference of the castings of different specifications is large, the riser cannot effectively feed the thickness position of the steering yoke, so that the quality of the final casting is affected, and therefore, it is highly desirable to design an integrated casting method for the steering yoke so as to solve the above problems. Disclosure of Invention The invention aims to solve the technical problems that the material utilization rate is improved by adopting a casting mode for integrated molding, and the riser cavity modulus and the riser neck modulus are limited by additionally arranging the reinforcing rib cavity, so that effective feeding can be realized during casting, and the quality of a final casting is ensured. An integrated casting method for a steering yoke, comprising the steps of: The method comprises the following steps of S1, preparing a die sand mold for casting a steering yoke casting, wherein the die sand mold comprises a riser cavity, a riser neck, a reinforcing rib cavity and a casting cavity which are sequentially communicated from top to bottom, the casting cavity comprises a yoke part cavity corresponding to a steering yoke part, a sleeve part cavity corresponding to a sleeve part and a groove key part cavity corresponding to a groove key part, the reinforcing rib cavity is arranged on one side of the sleeve part cavity away from the groove key part cavity along the axial extending direction of the sleeve part cavity, and extends from the joint yoke part cavity and sleeve part cavity joint part to the sleeve part cavity and groove key part cavity joint part; S2, preparing molten metal for casting the steering yoke, pouring the molten metal into the riser cavity, and entering the casting cavity through a riser neck and a reinforcing rib cavity to mold a casting; s3, cooling the die sand mould after casting molding is completed, and then taking out castings in the die sand mould; and S4, cutting and removing the parts, corresponding to the riser cavity, the riser neck and the reinforcing rib cavity, of the cast, and then performing shot blasting and polishing on the cut cast to form the final steering yoke. As a preferable technical scheme of the invention, the section of the reinforcing rib cavity along the extending direction is rectangular, the minimum width in the rectangle is more than or equal to 7mm, and the modulus of the riser cavity is thatAnd (2) andWhereinIs the standard modulus coefficient of the ball-milling cast ironIs in the range of 0.8 to 1.0,For the reinforcing rib cavity modulus, the reinforcing rib cavity modulusWhereinFor the volume of the casting corresponding to the casting cavity,The riser neck modulus is as follows, which is the surface area of the casting corresponding to the casting cavityAnd (2) and。 As a preferable technical scheme of the invention, fe, C, si, mn, S, P is included in the molten metal, wherein the mass ratio of C in the molten metal is 3.7% -3.9%, the mass ratio of Si is 1.8% -2.4%, the mass ratio of Mn is less than or equal to 0.3%, the mass ratio of S is less than or equal to 0.015%, the mass ratio of P is less than or equal to 0.05%, and the rest mass ratio element in the molten metal is Fe. As a preferable technical scheme of the invention, the casting molding of casting by pouring the molten metal into the riser cavity and entering the casting cavity through the riser neck and the reinforcing rib cavity in the S2 specifically comprises the following steps: Pouring the molten metal into a spheroidizing