Forming method and mould for inner riveting collar for boxcar

Abstract

The invention discloses a method and a die for forming an internally-riveted lantern ring for a boxcar. The lantern ring is composed of a sleeve with a large inner hole and a flange with a small inner hole. The procedures of cropping, 1-5 station cold-upsetting, punching and the like are adopted. The two end surfaces of a cold-upsetting blank are smoothed and an upper chamfering outer conical surface and a lower chamfering outer conical surface are cold-upset at stations 1 to 2. The flange, a sleeve blank, a pre-formed hole in the formed flange, the sleeve and three inner holes are formed through cold-upsetting at stations 3 to 5. Waste in the three inner holes is eliminated through punching and the lantern ring is formed. Each of dies at the stations 3 to 5 is provided with an upper pipe driven by a punching core. The product can be prevented from retreating upwards during return, and is directly ejected out by a lower ejection needle or ejected out by the ejection needle and an outer push pipe. Existing turning machining is replaced by the cold-upsetting, so that the product is high in strength; and the volume of each blank is reduced by 3 times, the utilization rate of materials is increased by 3 times, and the usage amount of the materials is reduced to be 1 / 3. The cold-upsetting blank is machined on a cold-upsetting forming machine of a six-station die equipped with an automatically-running clamp, at least 30 products can be cold-upset in one minute, and at least five minutes of existing turning machining needs to be carried out for forming one product, so that the efficiency is increased by more than 150 times. The method and the die can be used for the internally-riveted lantern ring for the boxcar.

Description

[0001] (1) Technical field: The present invention relates to a cold heading forming technology of a rivet collar, belonging to connectors (E06B) and metal forgings (B21J). (two) background technology: [0002] The shape of the finished product 7 of the inner riveting rivet collar used in the railway boxcar (truck) see Figure 7 with Figure 8 , The finished collar is composed of a sleeve 7B and a flange 7A (also known as a collar head). The sleeve 7B includes two sections: the hook section of the thin-walled cylinder whose inner hole is a large hole 7.2 and the locking section of a thick-walled cylinder whose inner hole is a small hole 7.1. (For details, please refer to the Chinese invention patent <Detachable Double Locking Riveting Disassembly Method and Pull Rivet> Patent No. ZL201410650279.8). The inner hole of the flange is also a small hole 7.1, which is called the small hole 7.1 in the flange, and the large hole 7.2 is called the large hole 7.2 in the sleeve, bot...

AI Technical Summary

Problems solved by technology

[0004] The manufacturing method and mold of the inner riveting collar for boxcars provided by the present invention is to solve the problems of low raw material utilization rate, low processing efficiency, and low strength when the traditional inner riveting rivet collars for boxcars are formed by turning method.

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