CN107999701B

CN107999701B - Casting core splitting process for side frame of railway wagon

Info

Publication number: CN107999701B
Application number: CN201711057106.5A
Authority: CN
Inventors: 陈祖华; 宋仲明; 何氢玲
Original assignee: CRRC Yangtze Tongling Co Ltd
Current assignee: CRRC Yangtze Tongling Co Ltd
Priority date: 2017-11-01
Filing date: 2017-11-01
Publication date: 2020-08-28
Anticipated expiration: 2037-11-01
Also published as: CN107999701A

Abstract

The invention discloses a casting core splitting process for a side frame of a railway wagon, which comprises the following steps of: firstly, flatly placing a side frame in a sand core box, and designing a central square frame core according to an internal square frame of the side frame; then, designing a middle frame core, sleeving the middle frame core on the central square frame core, and fixing the middle frame core; and finally, designing triangular elbow cores at two ends of the middle frame core, and splicing the triangular elbow cores with the middle frame core. The core splitting process provided by the invention has reasonable design, realizes the integration of the sand core in the cavity of the side frame, improves the core setting precision and efficiency, and can play a role in stabilizing the product quality and improving the safe and reliable operation of the product.

Description

Casting core splitting process for side frame of railway wagon

Technical Field

The invention relates to the technical field of casting of side frames of railway wagons, in particular to a casting core splitting process of the side frames of the railway wagons.

Background

Along with the rapid development of railway transportation equipment, the quality of the casting parts of the railway freight car is continuously improved, the models are continuously changed, the casting production technology, the production mode and the production efficiency are required to meet the market requirements, the large-scale production requirements of the current market are obviously insufficient, and the casting parts are basically in the production patterns of multiple varieties and small batches, so that higher requirements are provided for the production combination of enterprises, the quality and the production progress of the casting parts are ensured, meanwhile, the benefits of the enterprises are met, and the production enterprises are required to continuously excavate the production potential, optimize the production process and improve the production technology.

The production requirements of various varieties and small batch are low, the investment is required to be low, the quality is good, and the effect is fast. The key parts of the swing bolster side frame on the truck bogie are produced by adopting a split core structure, and although the split core is less in investment and short in production preparation time, the core making and core setting workload is large, the production efficiency is low, the labor intensity is high, and the quality stability is poor, so that the product quality and the efficiency are directly influenced by the core dividing process, the core dividing process needs to be reasonably designed, optimized and innovated, the integrity and the matching precision of a sand core are improved, and the production efficiency and the product quality are promoted.

At present, in side frame casting production, inner cavity sand cores are more in sections, the number of the sand cores is large, the integrity is poor, the core assembly precision is low, seams are large, the wall thickness of an inner cavity of a casting is inconsistent, fash is large, and the quality of the inner cavity is poor.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a casting core splitting process for a side frame of a railway wagon, which solves the problem of excessive core splitting quantity in the traditional side frame casting core splitting process, improves the integrity of an inner cavity of the side frame, reduces splicing fash, improves the quality of the inner cavity, and realizes the integral consistency of the quality of the inner cavity of the side frame.

The technical problem to be solved by the invention is realized by adopting the following technical scheme:

a casting core splitting process for a side frame of a railway wagon comprises the following steps:

firstly, flatly placing a side frame in a sand core box, and designing a central square frame core according to an internal square frame of the side frame;

then, designing a middle frame core, sleeving the middle frame core on the central square frame core, and fixing the middle frame core;

and finally, designing triangular elbow cores at two ends of the middle frame core, and splicing the triangular elbow cores with the middle frame core.

The further improvement lies in that the middle frame core is formed by integrally forming an upper beam core, a belly core and a part of large triangular core.

The further improvement lies in that the fit clearance of the middle frame core and the central square frame core is set to be 0.5 mm.

The further improvement lies in that the triangular elbow core and the middle frame core share the core base when being spliced, and a deviation angle is formed between the triangular elbow core and the middle frame core.

The further improvement is that the triangular elbow core is formed by integrally forming part of a large triangular core and the elbow core.

The invention has the beneficial effects that: the core splitting process has reasonable design, realizes the integration of the sand core of the inner cavity of the side frame, improves the core setting precision and efficiency, and can play the roles of stabilizing the product quality and improving the safe reliability of the product operation.

Drawings

FIG. 1 is a schematic structural view of a core separation process;

wherein, 1-side frame, 2-central square frame core, 3-middle frame core, 4-triangular elbow core and 5-core seat.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.

As shown in FIG. 1, a core casting and splitting process for a side frame 1 of a railway wagon comprises the following steps: firstly, flatly placing a side frame 1 in a sand core box, and designing a central square frame core 2 according to an internal square frame of the side frame 1; then, designing a middle frame core 3, sleeving the middle frame core 3 on the central square frame core 2, and fixing the middle frame core 3; and finally, designing triangular elbow cores 4 at two ends of the middle frame core 3, and splicing the triangular elbow cores 4 and the middle frame core 3 together. The stability of the precision of core setting size has been guaranteed, has avoided unnecessary auxiliary stay, and once only accurate the target in place that falls has reduced core setting number of times and adjustment work load, has improved production efficiency.

Preferably, the middle frame core 3 is formed by integrally molding an upper beam core, a belly core and a part of a large triangle core. The middle part of the inner cavity of the side frame 1 is formed by an integral sand core, so that the number of the sand cores is reduced, the possibility of splicing fash and core staggering of the sand cores is avoided, the size precision of the inner cavity is ensured, and the quality of the inner cavity is improved.

Preferably, the fit clearance between the middle frame core 3 and the central square frame core 2 is set to be 0.5mm, so that the core setting precision is ensured.

Preferably, the triangular elbow core 4 and the middle frame core 3 share the core base 5 when being spliced, and a deviation angle is formed between the triangular elbow core 4 and the middle frame core 3. Play fine screens restriction effect each other, reduce and remove the dislocation, improve the concatenation quality, avoided 4 closed angles sand of triangle elbow core, problem that intensity is low again simultaneously.

Preferably, the triangular elbow core 4 is formed by integrally forming a part of a large triangular core and an elbow core. The elbow cores at the two ends are supported after the core is placed, the supporting structure is more reasonable and stable, the sand core is more balanced, the accuracy of the core placement is improved, and the size precision is guaranteed.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A core splitting process for casting a side frame of a railway wagon is characterized by comprising the following steps of:

firstly, flatly placing a side frame (1) in a sand core box, and designing a central square frame core (2) according to an internal square frame of the side frame (1);

then, designing a middle frame core (3), wherein the middle frame core (3) is formed by integrally forming an upper crossbeam core, a belly core and a part of large triangular core, the middle frame core (3) is sleeved on the central square frame core (2), the middle frame core (3) is fixed, and the middle frame core (3) is in clearance fit with the central square frame core (2);

finally, design triangle elbow core (4) at the both ends of middle part frame core (3), triangle elbow core (4) are by the big triangle core of part and elbow core integrated into one piece, triangle elbow core (4) are in the same place with middle part frame core (3) concatenation, sharing core base when triangle elbow core (4) and middle part frame core (3) splice to be formed with the skew angle between triangle elbow core (4) and middle part frame core (3).

2. The process of claim 1, wherein the casting of the core of the side frame of the rail wagon is as follows: the fit clearance between the middle frame core (3) and the central square frame core (2) is set to be 0.5 mm.