CN111036853A

CN111036853A - Size control method for 8MW fan base casting

Info

Publication number: CN111036853A
Application number: CN201911231119.9A
Authority: CN
Inventors: 陆志刚; 赵栋; 赵龙; 季虎; 王卫国; 王强
Original assignee: Jiangsu Jixin Wind Energy Technology Co Ltd
Current assignee: Jiangsu Jixin Wind Energy Technology Co Ltd
Priority date: 2019-12-05
Filing date: 2019-12-05
Publication date: 2020-04-21
Anticipated expiration: 2039-12-05
Also published as: CN111036853B

Abstract

The invention relates to a size control method of an 8MW fan base casting, which is characterized in that through reasonable design, parting surfaces of an upper mold and a lower mold are arranged in a motor hole of a fan base and are parallel to a yaw flange; compared with the traditional parting method, the design greatly reduces the quantity of mud cores; the internal shape and size of the fan base can be formed by only two mud cores; wherein the lower part is completely formed by the mud core 3, and the upper part is completely formed by the mud core 4; the surface of a cavity formed by assembling a plurality of mud cores is not formed; the accumulated errors generated in the assembly process of the mud cores are reduced, the accuracy of the size of the casting is guaranteed, and the operation difficulty of operators during assembly of the mud cores is reduced.

Description

Size control method for 8MW fan base casting

Technical Field

The invention relates to the field of casting processing, in particular to a size control method of an ultra-large casting, and more particularly relates to a size control method of an 8MW fan base casting.

Background

The wind power base (base) is a core component for receiving a main shaft and a yaw system of a fan in fan equipment, and mainly comprises structural characteristics of a main shaft hole, a motor hole rib plate, a yaw flange, a bottom rib plate and the like as shown in figures 1-3. At present, wind power bases of industrial-grade wind power equipment are all made of nodular cast iron materials through casting and machining. Wherein, 8MW wind power equipment is the very large-scale wind power equipment who just puts into practical application in recent years, and its base size can reach length wide height: 6710mm 6356mm 5362mm, 58 tons of finished product, 65.5 tons of blank and 95 tons of cast iron.

When the 8MW wind power base is cast by the traditional process, in order to reduce the depth of the cavity as much as possible, a parting surface is arranged in the middle of the cavity (see fig. 4), and under the parting mode, 8 mud cores are adopted to be matched with an upper mold and a lower mold to form a casting cavity of the fan base (see fig. 5-6); in the actual casting process, the fact that the number of the mud cores is large is found that 8 mud cores in the traditional parting mode cause large accumulated errors during assembly; in addition, because the huge self quality of 8MW wind-powered electricity generation base, and the both sides bottom gusset area of this type of base is great, and does not design the strengthening rib, and the casting mould both sides will bear great expansion box power, and then lead to the foundry goods great dimensional deviation to appear.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a size control method of an 8MW fan base casting.

Specifically, the method of the invention comprises the following steps:

a size control method of an 8MW fan base casting is characterized in that the 8MW fan base casting is cast by adopting a sand casting process, and a casting mold consists of an upper mold, a lower mold and a mud core; the upper and lower parting surfaces pass through a motor hole rib plate of the fan base and are parallel to the yaw flange; the number of the mud cores is 4, and the mud cores are 1-4 respectively; wherein, the mud core 3 is positioned below the mud core 4, and an assembly gap is formed between the mud core and the mud core 4; casting gaps are reserved between the mud cores 3 and 4 and the upper and lower molds, and the mud cores 3 and 4 are used for forming the internal shape and size of the fan base; the mud cores 1 and 2 are positioned on the lower side of a main shaft hole of the fan base, and a casting gap is reserved between the mud cores 3 and 4; the mud cores 1 and 2 and the upper and lower molds jointly limit the external shape and size of the fan base.

Preferably, only assembly gaps exist between the mud cores 1 and 2 and between the mud cores and the upper and lower molds; the upper end surfaces of the mud cores 1 and 2 are flush with the maximum cross section of a main shaft hole of the fan base, so that the mud cores 1 and 2 are smoothly removed from the fan base model in the molding process, and the fan base model is smoothly taken out from an upper mold after the mud cores 1 and 2 are removed.

Preferably, the upper end surfaces of the mud cores 3 are flush with the upper end surfaces of the mud cores 1 and 2, so that the collision probability of the mud cores in the assembling process is reduced.

Compared with the prior art, the invention can at least obtain the following beneficial effects: the number of mud cores is greatly reduced by reasonably designing the position of a parting surface; the internal shape and size of the fan base can be formed by only two mud cores; wherein the lower part is completely formed by the mud core 3, and the upper part is completely formed by the mud core 4; the surface of a cavity formed by assembling a plurality of mud cores is not formed; the accumulated errors generated in the assembly process of the mud cores are reduced, the accuracy of the size of the casting is guaranteed, and the operation difficulty of operators during assembly of the mud cores is reduced.

Drawings

FIG. 1 is a schematic diagram of the form and related parameters of a certain type of 8MW wind power base;

FIG. 2 is a front view of the 8MW wind power base of FIG. 1;

FIG. 3 is a bottom view of the 8MW wind base of FIG. 1;

FIG. 4 is a schematic diagram of a conventional parting surface of an 8MW wind power base;

FIG. 5 is a mud core construction of an 8MW base using a conventional parting surface;

FIG. 6 is a perspective view of the mud core configuration of FIG. 5 in a top-bottom configuration;

FIG. 7 is a schematic diagram of a parting surface of an 8MW wind power base of the present invention;

FIG. 8 is a mud core configuration of an 8MW base employing the parting surfaces of the present invention;

fig. 9 is a perspective view of the mud core configuration of fig. 8 in a top-bottom configuration.

Detailed Description

Claims

1. A size control method of an 8MW fan base casting is characterized in that the 8MW fan base casting is cast by adopting a sand casting process, and a casting mold consists of an upper mold, a lower mold and a mud core; the method is characterized in that: the upper and lower parting surfaces pass through a motor hole rib plate of the fan base and are parallel to the yaw flange; the number of the mud cores is 4, and the mud cores are 1-4 respectively; wherein, the mud core 3 is positioned below the mud core 4, and an assembly gap is formed between the mud core and the mud core 4; casting gaps are reserved between the mud cores 3 and 4 and the upper and lower molds, and the mud cores 3 and 4 are used for forming the internal shape and size of the fan base; the mud cores 1 and 2 are positioned on the lower side of a main shaft hole of the fan base, and a casting gap is reserved between the mud cores 3 and 4; the mud cores 1 and 2 and the upper and lower molds jointly limit the external shape and size of the fan base.

2. The method for controlling the size of the 8MW fan base casting as claimed in claim 1, wherein: only assembly gaps exist between the mud cores 1 and 2 and between the mud cores and the upper and lower molds; the upper end surfaces of the mud cores 1 and 2 are flush with the maximum cross section of a main shaft hole of the fan base.

3. The method of controlling the size of an 8MW blower base casting of claim 2, wherein: the upper end surfaces of the mud cores 3 are flush with the upper end surfaces of the mud cores 1 and 2.