Lower base plate of double-layer turnout vibration damping fastener and manufacturing method of lower base plate

Abstract

The invention discloses a lower base plate of a double-layer turnout vibration damping fastener and a manufacturing method of the lower base plate. The manufacturing method comprises the following steps that a, a steel plate is cut into a target size to obtain a substrate; b, a through hole is formed in the substrate, a first annular step is arranged at the top end of the through hole, and a firstannular chamfer or a first annular rounding corner is arranged at the bottom end of the through hole; c, a locking boss is prepared through a precision casting process, a second annular step matchedwith the first annular step is arranged on the locking boss, the bottom end of the locking boss is inserted into the through hole in the substrate, and the second annular step is tightly attached to the first annular step; and d, the locking boss and the substrate are fixed through a tool, joint filling and welding operation is carried out between the first annular chamfer or the first annular rounding corner at the bottom end of the through hole and the locking boss, and welding scar polishing operation is carried out after full welding. The lower base plate of the double-layer turnout vibration damping fastener comprises the substrate and the locking boss, wherein the substrate and the locking boss are connected in a welding mode.

Description

Technical field [0001] The application relates to but not limited to the field of rail transit, and specifically relates to a bottom plate of a double-layer turnout damping fastener and a manufacturing method thereof. Background technique [0002] Turnout is a line connecting device that allows rolling stock to transfer from one track to another. It consists of a switch, a connecting part, a frog and a guard rail. It is an important part of the track structure, which is to bear and transmit. Various loads caused by train operation and important structures that guide train wheels forward. Due to the complexity of structure and force conditions, turnouts are always the weak link of the track system. In urban rail transit, turnouts are usually laid in parking lots, car depots, and other areas close to residential areas, which require high vibration and noise reduction performance. In the aspect of turnout vibration and noise reduction, the academic and engineering circles have don...

AI Technical Summary

Problems solved by technology

[0008] 1. After the locking boss casting is surfacing with the upper and lower sides of the substrate, a large weld scar will be formed. On the one hand, the existence of the weld scar will cause abnormal contact with the locking nylon sleeve, the middle elastic pad and the coupling backing plate, resulting in The abnormal wear of these key parts will reduce the service life of the double-layer turnout vibration-damping fastener system. On the other hand, large welding scars will cause the locking nylon sleeve and the middle elastic pad to be unable to be installed smoothly, affecting the upper and lower backing plates. The normal locking and damping performance of the middle elastic pad

[0009] 2. Grinding of welding scars destroys the microstructure of the substrate structure at the welding part to a certain extent, forming microcracks, reducing the welding strength and increasing the risk of desoldering of the locking boss under repeated lateral force

[0010] 3. Using the existing welding technology, the compressive strength of the locking boss and the base plate after welding is low, and the locking boss is under a greater pressure from the tightening of the anchor bolts, which increases the locking boss. The risk of desoldering due to high pressure

[0011] 4. The locking boss is a cast steel casting with limited dimensional accuracy, and the radial dimension of the welding part fluctuates greatly. In order to fit smoothly, the through hole of the base plate is placed larger, so that on the one hand, the welding strength is brought Adverse effects, on the other hand, the dimensional accuracy of the locking boss after welding cannot be guaranteed, which makes it difficult to install the upper backing plate and the locking nylon sleeve in the later stage

[0012] In the actual application process of double-layer turnout vibration-damping fasteners, quality problems at the welding seam of the locking boss of the lower backing plate occur from time to time, and even cracking of the welding seam occurs, which seriously affects the safety of train operation and promotes the market of the product. brought great difficulties

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