Method for casting and forming middle cross-bracing two-axle bogie adapter and manufacturing technique

Abstract

The invention discloses a casting mould for an adapter of a middle-crossing supporting two-axle truck, which comprises a left half sand box, a right half sand box, a cambered surface sand core, and sand mould positioning pins, wherein the left half sand box and the right half sand box which take an axial symmetrical plane of the adapter as a parting surface; the cambered surface sand core is arranged along the axial direction of the adapter and is used for forming an inner cambered surface of the adapter, wherein the end part of the core head of the cambered surface sand core is exposed out of the casting mould, and the matching parts between the core head of the cambered surface sand core and a left half sand box base and a right half sand box base are step-shaped and are used for positioning the cambered surface sand core relative to the left half sand box and the right half sand box; and the sand mould positioning pins are connected with positioning pin sleeves or pin holes of the left half sand box and the right half sand box and are used for positioning the left half sand box and the right half sand box. The casting mould without sand boxes is convenient for vertical moulding, has simple and convenient operation, solves the problem of difficult cooperation in the operation of a plurality of people, ensures that the mould assembly is smooth, and is advantageous to keep the dimensional precision of the casting mould and improve the quality of cast parts. On the basis, the invention also discloses a method for assembling moulds of the casting mould for the adapter of the middle-crossing supporting two-axle truck and a process for producing the adapter of the middle-crossing supporting two-axle truck.

Description

technical field [0001] The invention relates to the connection between the underframe and the bogie, in particular to the casting mold, assembly method and production process of the bearing saddle of the two-axle bogie with the middle cross support. Background technique [0002] The railway freight car of the wheel-rail vehicle generally includes a car body, a bogie, a brake device, a coupler buffer device and other parts. Among them, the function of the bogie is to support the car body, guide the vehicle to run along the track, and bear various loads from the car body and the line. Bogies are divided into two-axle bogies, three-axle bogies, etc. The two-axle bogie is divided into lower cross-braced bogie, middle cross-braced bogie, etc. The middle cross-braced two-axle bogie is mainly composed of bolsters, side frames, bearing saddles, axles, wheels, braking devices, and cross-bracing devices. The load-bearing saddle is a part between the axle and the side frame, which b...

AI Technical Summary

Problems solved by technology

[0025] There are obvious defects in the production process of the above-mentioned bearing saddle, which is because: in the production process of the existing bearing saddle, the three links of turning over the mold, casting mold blowing CO2 gas hardening, and closing the box are affected by equipment status, tooling accuracy, CO2 pressure, blowing pressure, etc. Many factors, such as CO2 time, tacit cooperation between the modeler and the driver, etc., have a great influence, and the change of each factor will lead to fluctuations in the quality of castings

[0026] For example, in the process of flipping the mold: if the equipment is not in good condition, it will cause vibration or impact when flipping the mold, causing the cavity to become larger; if the sand box is deformed or the box cover is worn, it will cause the casting to be wrongly boxed, resulting in an increase in the total size of the casting

[0027] Another example is blowing CO2 gas hardening of the mold: If the CO2 pressure is insufficient, the hardening depth of the hardened layer of the mold will not be enough, and the size of the casting box will increase after pouring; if the CO2 blowing time is too long, the mold will be too large Blowing makes the surface of the mold crisp and causes sand washing during pouring

[0028] For another example, in the box closing process: the technical level of the driver and the tacit understanding with the box closing personnel are not enough, which will lead to wrong boxes; or, the uneven box closing will produce floating sand, resulting in sand hole defects in castings

[0029] In addition, the existing process uses a special sand box for ductile iron, metal templates, and metal patterns, and there are still problems of complicated tooling and high cost.

[0030] The existing technology inevitably has the above-mentioned many defects, which lead to the bearing saddle products not fully meeting the technical requirements, so it needs to be solved by improving the process. Among them, the first thing to solve is that the bearing saddle castings are unstable in size and the dimensional tolerance cannot reach CT10 precision. question

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