WO2013127219A1

WO2013127219A1 - Bolster sand core for intersecting rod-type bogie frame and manufacturing method

Info

Publication number: WO2013127219A1
Application number: PCT/CN2012/086124
Authority: WO
Inventors: 宋仲明; 何氢玲; 严建军; 旷丹峰; 王连华; 苟春林; 汪焱; 熊火顺; 张厚胜; 郑志坚; 吴文俊
Original assignee: 南车长江车辆有限公司
Priority date: 2012-03-01
Filing date: 2012-12-07
Publication date: 2013-09-06
Also published as: CN102527946A

Abstract

Disclosed is a bolster sand core for an intersecting rod-type bogie frame. A fish belly inner cavity structure (6) below a central plate face (8), a water leak-hole structure (7), a lightening hole structure (4), a pull rod hole structure (5), an inner cavity structure with a splayed face (2) and an end structure (1) of the bolster sand core are moulded in one as a whole sand core. The method of manufacturing the bolster sand core for an intersecting rod-type bogie frame comprises, according to bolster casting technique requirements, fabricating the fish belly inner cavity structure, the water leak-hole structure, the lightening hole structure, the pull rod hole structure, the inner cavity structure with a splayed face and the end structure in one as a whole core box; fitting a core shooter with the whole core box and clamping the mould, adding sand, shooting sand, hardening, opening the mould, and ejecting the core, and ejecting the whole sand core from the mould in one; and processing the surface of the whole core manually. The bolster sand core obtained has a smooth surface, can effectively avoid the casting burrs and seams produced when combining multiple components to form a sand core, the intrinsic quality of the casting piece is improved, and the intensity of work is lightened.

Description

Cross rod type bogie bolster sand core and manufacturing method thereof

The invention relates to the technical field of manufacturing a bolster sand core for a crossbar type bogie for a railway wagon. Background technique

The bolster is an important part of the railway wagon. It is a thin-walled shell structure and is made of low alloy steel. In the design of railway freight car bogies, bolsters and bolsters are the main components and the main force parts. Railway trucks are operating under different conditions, and the bolsters have to withstand various tests.

With the development of China's railway freight cars in the direction of high-speed and heavy-duty, the quality and comprehensive performance requirements of important parts such as bolsters are higher. Therefore, in order to meet the development needs of railway wagons in the future, it is necessary to improve the quality of important parts such as bolsters. Comprehensive performance to ensure the reliability and safety of high-speed and heavy-duty operation of railway wagons.

The bolsters for railway wagons at home and abroad use sand cores as mold casting production. At present, the split core casting process is adopted in foreign countries. The domestic manufacturing enterprises produce the bolsters using the integral core casting process. Each manufacturing enterprise forms the fish belly structure, the drawbar hole structure and the splayed surface structure from a whole sand core, but the overall core of each enterprise The end sand core is divided into two parts or three parts, so that the integral core and the end sand core are combined to form the bolster inner cavity structure. The inner cavity of the bolster cannot be formed by a sand core, and the core and the sand core are combined. It is prone to casting defects such as crevices, cracks, and blisters, increasing the amount of finishing work, reducing production efficiency, reducing product quality, and posing safety hazards. Casting defects such as crevices, cracks, and blisters have been plaguing bolster manufacturers. Therefore, it is necessary to improve the manufacturing technology of bolster cores in bolster casting to find a more reasonable manufacturing technique. Summary of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the existing bolster casting technology, and to provide a cross-bar bogie bolster sand core and a manufacturing method thereof, thereby effectively improving the quality and comprehensive performance of the bolster product. In order to solve the above technical problem, the present invention provides a cross-bar type bogie bolster sand core, which is characterized in that it comprises a fish belly inner cavity structure under the surface of the core disk, a water leakage hole structure, a relief hole structure, a drawbar hole structure, and a figure surface. The inner cavity structure and the end structure, the fish belly inner cavity structure, the water leakage hole structure, the relief hole structure, the tie rod hole structure, the figure-shaped inner cavity structure and the end structure are integrally formed integral sand cores.

The invention also provides a method for manufacturing the crossbar type bogie bolster core, comprising the following steps:

According to the requirements of the bolster casting process, the inner core cavity structure, the water leakage hole structure, the relief hole structure, the drawbar hole structure, the splayed cavity structure and the end structure integrated core core box under the core plate surface are prepared, and the core shooting machine is assembled. Cooperate with the integral core box to perform mold clamping, sanding, sand shooting, hardening, mold opening, and top core, and shoot the sand core in one shot.

Manually process the entire core surface.

In order to ensure a uniform cooling effect of the overall core, when the core shooter cooperates with the integral core box, the outer cold iron, the chromite ore and the reinforcing core are placed in the upper and lower core boxes to have a thickness greater than the average thickness. Locally.

The method of the invention adopts an integral one-time forming process, and the core making process has a high degree of automation, which can effectively reduce the influence of human factors on the quality of the core. The surface of the prepared bolster sand core is smooth, avoiding the casting flash and the quilting caused by the diversified combined sand core, and the surface of the casting cavity is smooth and smooth, and the sand, pores and crack defects on the inner cavity surface of the casting are greatly reduced. Reduce the strength of casting cleaning and improve the quality of castings

DRAWINGS

The technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

1 is a schematic structural view of an integral core of a bolster made in accordance with the present invention. detailed description

The manufacturing method of the present invention is as follows: First, according to the requirements of the bolster casting process, the surface of the core plate is made Fish core inner cavity structure, water leakage hole structure, lightening hole structure, drawbar hole structure, splayed cavity structure and end structure integrated core core box,

Then, the integral core box is combined with the core shooting machine, and the outer cold iron, the chromite ore and the reinforcing core are placed in a portion of the upper and lower core boxes having a thickness greater than the average thickness.

Then, the mold is clamped, sanded, shot, hardened, opened, and cored, and the sand core is shot at once. The core shooter uses triethylamine hardened resin sand.

Finally, the overall core surface treatment is performed manually, and the treatment includes overall inspection and partial grinding. The overall core of the bolster is as shown in Fig. 1. The fish belly core 6 under the heart plate surface 8, the upper leakage hole 7, the lower leakage hole 3, the relief hole core 4, the tie rod hole core 5, the end sand The core 1, the splayed sand core 2 is joined to form a bolster integral sand core. The mutual combination of the plurality of split sand cores of the prior art is avoided, resulting in casting defects such as crevices, cracks, and blisters.

The scope of the present invention is not limited to the embodiments described above, and it is obvious that those skilled in the art can make various modifications and changes to the invention without departing from the scope and spirit of the invention. Such changes and modifications are intended to be included within the scope of the appended claims.

Claims

Claim

A cross-bar type bogie bolster core characterized by comprising: a fish belly inner cavity structure under the surface of the core disk, a relief hole structure, a drawbar hole structure, a splayed cavity structure and an end structure, the fish The abdominal cavity structure, the leaky pore structure, the relief pore structure, the drawbar hole structure, the splayed cavity structure and the end structure are integrally formed integral sand cores.

2. A method of manufacturing a crossbar type bogie bolster core according to claim 1, further comprising the steps of:

According to the requirements of the bolster casting process, an integrated integrated core box including a fish belly inner cavity structure, a water leakage hole structure, a relief hole structure, a drawbar hole structure, a splayed inner cavity structure and an end structure is prepared;

The integral core box and the core shooting machine are combined to perform mold clamping, sanding, sand shooting, hardening, mold opening, and top core, and the sand core is integrally shot out at one time;

Finally, the overall core surface treatment is performed manually.

The method for manufacturing a bolster sand core of a cross-bar type bogie according to claim 2, wherein when the core shooter cooperates with the integral core core box, the outer cold iron, the chromite ore and the reinforcement are strengthened. The acting core is placed in a portion of the upper and lower core boxes having a thickness greater than the average thickness.