JPS59120357A - Casting method of wear resistant pipe - Google Patents

Abstract

PURPOSE:To permit easy machining by setting annular metallic members which are relatively easy to machine in the prescribed parts of a casting mold and performing casting thereby melt-sticking the cast metal to the metallic members, in casting of a wear resistant pipe. CONSTITUTION:Metallic members 4 for flange parts which are easy to machine are incorporated in a casting mold and wear-resistant castings 1, 2 are cast. The molten metal and the metallic members are melt-stuck in the parts where they contact with each other. If many waste bars, etc. are disposed in the meltstuck parts, the much securer bond is obtd. The joint surfaces, assembling bolt holes, etc. of the flanges 4 of such bent pipe are machined. The machining of the wear- resistant pipe is made easy and the cost thereof is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the method for casting pipes with one side wear, such as vent pipes and pulverized coal supply pipes.

Fig. 1 shows the shape of a general vent pipe P. The vent pipe P is formed of a thin inner part 1 and a thick outer part 2.
The outer part 2, which is subject to a lot of wear, is made thicker. MaL-
The seven-rank portions 6 at both ends must be precisely machined to ensure accurate connections to other pipes.

However, the L-shaped abrasion resistant pipe of the bent pipe is cast 1~ using high chromium cast iron or 2-1 inch cast iron, and the flange part 6 is also cast from the same material.
The mechanical finishing process T requires a large number of man-hours and has the drawback of increasing costs.

The present invention eliminates the drawbacks of the conventional wear-resistant pipes mentioned above, and provides a method for casting wear-resistant pipes that makes it possible to obtain wear-resistant pipes that are easy to reduce the mechanical strength of the flange part and are inexpensive. In order to cast a wear-resistant outer tube by injecting molten wear-resistant cast iron into a mold, relatively machining is required at a predetermined location of the mold. Pre-caulking a ring-shaped member formed of a metal material that is easy to process and casting 1-1 to cast a wearable tube in which the ring-shaped member is integrally fused to both ends. The present invention relates to a method for casting a wear-resistant pipe characterized by:

The present invention will be specifically explained below with reference to FIGS. 2 to 4. The illustrated example shows a case where the present invention is applied to casting of a vent pipe. In Figure 2, P
This is a vent pipe consisting of a thin interior part 1 and a thick outside part 2.The vent pipe P is made of 11-mm cast iron with a height of 11 mm, like the previous vent pipe. Cast using cast iron. , (equal parts have the same code ηdoki1
It is 7. ) 4 is a flange portion formed at both ends of the vent pipe P during casting, and the flange portion 4 is relatively machined ((-1
The flange portion 4 is formed as shown in FIGS. 6 and 4 by ring pieces 4a and 4b made of a fully bendable material, such as a steel root, that can be easily bent, and an outer peripheral plate 4c. When making the vent pipe P, I set it at a predetermined point (C pre-gage y) in the mold and poured the elution of surface 1 worn cast iron into the mold. It is formed by attaching the L and both ends of the vent pipe P in one piece 4). In order to facilitate this fusion, there is a 5
A large number of stem rods 5 with a diameter of about r + r are arranged, and the stems (
It is desirable that the molten metal be wrapped around 5.

In summary, the present invention provides a method for injecting molten metal of cast iron with one side of wear into a mold to cast a wear-resistant pipe, and to apply mechanical processing to a predetermined portion of the mold with a relatively easy right-click T. )jf Ring-shaped part molded from metal material, ('' is pre-set and cast 1
2. In both cases, the ring-shaped member 4' is integrally fused to the HM part to provide wear resistance (abrasion resistance characterized by casting 1 tube of 4 tubes + 1 tube vj manufacturing method ρ). Because it is intended to be
According to the present invention, a practical effect can be mentioned in that an abrasive tube having flange portions 4 which can be easily machined at both ends can be easily cast.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical side view of a conventional vent pipe, FIG. 2 is a schematic vertical side view of a wear-resistant pipe according to the present invention, FIG. 6 is an enlarged view of section A in FIG. 2, and FIG. is a BB line arrow diagram in FIG. 6. 1: Inner thin wall part, 2: Outer wall 1!2 part, 4: Flange part, 5: Stay rod. Sub-agent Patent attorney Teru Ito (and 2 others) Procedural amendment dated 11126/1980 Kazuhiro Wakasugi, Commissioner of the Patent Office 1. Indication of the case 3. Person making the amendment Relationship with the case Patent applicant office 2-15 Marunouchi, Chiyo ITI-ku, Tokyo 100
Number 1 Name (620) Tamabishiju] Ding: Industry Co., Ltd. Representative Isao Yano 4, Sub-Agent Address 1-12-29 Toranomon-Chome, Minato-ku, Tokyo 105
No. 6, Specification to be amended 7 Description of the amendment 1! IHI, page 5, bottom line ``Insert the following text between lines 1 and 2. Bolt holes can be easily machined by drilling them.''

Claims (1)

[Claims] Pour 1 molten iron into the casting pan, and then...
When casting 1 millimeter 1/1 tube, the predetermined number of pieces of the mold
First, a ring-shaped part (A) molded from a metal material that is relatively easy to machine is cast in advance, and the rick-shaped parts (() are fused to an integral surface at both ends. A method for casting a wear-resistant tube, which has a characteristic of reducing wear resistance.