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Mold core for solving breakage of core head thereof, and preparation method of precision cast component

A technology of core and core head, applied in the direction of core, casting molding equipment, casting mold, etc., can solve the problems of easy fracture and high rejection rate of castings, and achieve the effect of preventing cracks

Active Publication Date: 2020-10-02
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The blade top cover plate, dust removal hole and blade body air-cooling channel are generally integrally formed with a ceramic core, and the dust removal hole is generally directly formed on the ceramic core with a quartz glass rod / ceramic core slurry to reduce production costs, such as Image 6 As shown, with this kind of dumbbell-shaped structure design, in the manufacturing process, the forming of the ceramic core is very easy to form cracks in the forming part of the dust removal hole structure. And during the molten steel filling process after the ceramic shell is formed, the ceramic core is prone to breakage at the dust removal hole, resulting in a high casting rejection rate

Method used

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  • Mold core for solving breakage of core head thereof, and preparation method of precision cast component
  • Mold core for solving breakage of core head thereof, and preparation method of precision cast component
  • Mold core for solving breakage of core head thereof, and preparation method of precision cast component

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 , figure 2 , image 3 As shown, in this embodiment, a core that solves the fracture of the core core head includes a blade root core head 2, a core blade body 3, and several core rods 4 arranged in sequence from bottom to top. The mandrel 4 extends beyond the designed end of the hollow blade 1 .

[0029] Such as Figure 4 As shown, the design length of the core rod 4 is increased, the traditional tip core head 7 is omitted, and the pressure or bending moment on the core rod 4 can be reduced when manufacturing the core, thereby ensuring that the core rod 4 The quality of the molding can be improved, and problems such as bending, cracking, and fracture of the core rod 4 during the molding process can be avoided, and the quality factors of the core can be avoided from affecting the subsequent casting work.

Embodiment 2

[0031] As shown in FIG. 5 , on the basis of the above embodiments, in this embodiment, the free end of the mandrel 4 is connected with a mold insert block 6 .

[0032] After the core preparation is completed, the core is used to cast the wax pattern 5 of the hollow blade 1, and the end face of the hollow blade 1 and the core rod 4 at the same end is provided with a mold groove, and the mold inlaid block with the same profile as the groove is used 6 can make the groove shape.

[0033] After the preparation of the core is completed, the core rod 4 has sufficient strength to avoid bending and breaking due to the pressure of the mosaic block 6 .

[0034] The core rod 4 is detachably connected to the mold inlay block 6, and the mold inlay block 6 can be quickly removed after the wax mold 5 is formed.

Embodiment 3

[0036] Such as figure 1 , figure 2 , image 3 As shown, in this embodiment, a method for preparing precision casting parts that solves the fracture of the core core head includes the following steps:

[0037] Step S1: Design the casting rough drawing, design and manufacture the core according to the casting rough drawing, so that the length of the core rod 4 exceeds the designed end surface of the hollow blade 1 . The design length of the core rod 4 is increased, and the traditional tip core head 7 is omitted. When the core is manufactured, the pressure or bending moment on the core rod 4 can be reduced and avoided, thereby ensuring that the core rod 4 The quality of the molding can be improved, and problems such as bending, cracking, and fracture of the core rod 4 during the molding process can be avoided, and the quality factors of the core can be avoided from affecting the subsequent casting work. This solution does not use the traditional blade top core 7, and can als...

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Abstract

The invention discloses a mold core for solving breakage of a core head thereof, and a machining method. The machining method comprises the following steps of: designing a cast blank drawing; designing and manufacturing a mold core according to the cast blank drawing, wherein the mold core comprises a vane root core head, a mold core vane body and a mold core rod that are sequentially arranged from bottom to top, and the mold core rod extends out of the designed end part of a hollow vane; designing and manufacturing a wax pattern mold and a mold insert according to the cast blank drawing, wherein the mold insert is provided with a hole which is installed in a manner of being matched with the mold core rod; putting the mold core into the wax pattern mold and then connecting the mold insertwith the mold core rod of the mold core; pressing a wax pattern inside the wax pattern mold; and taking out the wax pattern after the wax pattern is pressed. The machining method disclosed by the invention has the beneficial effects that a long core rod is adopted to save a core head at the top of the vane, so that the bending torque and pressure applied to the mold core in a manufacturing processof the mold core can be reduced; crack formation, deformation or inclination of the mold core rod in a molding process can be beneficially prevented; and thus the molding precision and percent of pass of cast pieces in the later period are not affected.

Description

technical field [0001] The invention relates to the technical field of investment precision casting of blades, in particular to a core and a processing method for solving the fracture of the core head. Background technique [0002] Heavy-duty gas turbine blades are cast by investment casting. The investment casting process is as follows, "preparation of core → pressing wax pattern → wax pattern tree → preparation of ceramic shell → shell dewaxing → shell roasting → shell preheating → molten steel smelting and pouring → shell cleaning → post-processing". [0003] The hollow moving blade contains an air-cooling channel. A cover plate is arranged on the top of the blade to form a closed space for the cooling channel of the blade body. A dust removal hole is provided on the cover plate to remove impurities in the cooling gas. The blade top cover plate, dust removal hole and air-cooling channel of the blade body are generally integrally formed with a ceramic core, and the dust r...

Claims

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Application Information

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IPC IPC(8): B22C9/10B22C9/04
CPCB22C9/10B22C9/04
Inventor 赵代银何建王海洋伍林曾洪杨照宏杨功显贺群功李林蓄李海松贺兵叶丽付萃莲蔡江
Owner DONGFANG TURBINE CO LTD
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