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Device and method for full mold centrifugal casting of double-plate flange straight tube and wall flange straight tube

A technology of centrifugal casting and flange, which is applied in the field of centrifugal casting, can solve the problems that cannot be completely eliminated, the welding quality cannot be evaluated by users, and the stress concentration in the welding area can achieve the same overall metallographic structure, which is conducive to protecting the environment and alloy The effect of tissue densification

Inactive Publication Date: 2017-09-05
营口经济技术开发区爱维尔铸业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of welding double-disk flange pipes: (1) The material of the weld seam is inconsistent with that of the cast pipe body, and the strength of the "heterogeneous" weld seam is low
(2) Stress concentration in the welding area cannot be completely eliminated
(3) The flanges at both ends of the pipe are manually assembled before welding, and the size error is large; it is difficult to ensure the concentricity of the two flange holes and the parallelism of the disk surface due to the influence of thermal stress during the welding process
(4) At present, there is no evaluation standard for cast iron welds at home and abroad, so users cannot evaluate the welding quality
Among them, the main problems of ordinary sand casting are uneven wall thickness and bending deformation; the main problems of lost foam casting are slag inclusion, many pores, and high water leakage rate in hydraulic test.
In particular, it should be pointed out that the smaller the pipe diameter and the longer the length, the greater the probability of the above-mentioned defects. It is difficult to form a flange pipe with a length of less than DN200 and a length of more than 2 meters. Even if it is formed, the pass rate is very low. , unable to meet market demand

Method used

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  • Device and method for full mold centrifugal casting of double-plate flange straight tube and wall flange straight tube
  • Device and method for full mold centrifugal casting of double-plate flange straight tube and wall flange straight tube
  • Device and method for full mold centrifugal casting of double-plate flange straight tube and wall flange straight tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] PN16, length 1.8 meters, DN800 double disc flange straight pipe, 3 pieces of one-type centrifugal casting method with solid type centrifugal centrifugal casting are:

[0072] (1) Model preparation

[0073] A. Prepare DN800, PN16 foam plastic molds 4-5 according to user needs. Foam plastic mold 4-5 is that EPS beads pass through pre-foaming, and in special-purpose molding machine, pass through solid type centrifugal casting mold 4 thermoplastic molding. The straight pipe section and the flange are split molded. The characteristic of foam plastic mold 4-5 is that it can be cut and assembled at will, and the PN16 flange and straight pipe are spliced ​​into two semicircles according to the length of 1.8 meters, and three pieces are manufactured respectively;

[0074] B. Install the prepared 3 pieces of foam plastic mold 4-5 on the positioning steel pipe skeleton 4-9. When assembling, pay attention to the distance between the end faces of the 3 pieces of flanges not less t...

Embodiment 2

[0093] Casting PN16, DN200 single-disc wall-through flange straight pipe with a length of 4 meters by using the real-type centrifugal casting method, and the length of the wall-through flange from the flange sealing end is 2 meters. The centrifugal casting method is:

[0094] (1) Model preparation

[0095] A. Prepare DN200, PN16 foam plastic molds 4-5 according to user needs. Foam plastic mold 4-5 is that EPS beads pass through pre-foaming, and in special-purpose molding machine, pass through solid type centrifugal casting mold 4 thermoplastic molding. The straight pipe part is molded with the flange and the through-wall flange. The characteristic of the foam plastic mold 4-5 is that it can be cut and assembled at will. The PN16 flange and the straight pipe are spliced ​​into two semicircles according to the length of 4 meters, and the wall-through flange is fixed at 2 meters from the end face of the flange;

[0096] B. Install the prepared foam plastic mold 4-5 on the posit...

Embodiment 3

[0116] The centrifugal casting method of PN10 with solid type centrifugal centrifugal casting, length 2.5 meters, specifications are DN350, DN400 double-disc flange straight pipe, 2 pieces, one type centrifugal casting method is:

[0117] (1) Model preparation

[0118] A. Prepare DN350, PN10, 2.5 meters in length and 4-5 foam plastic molds in DN400, PN10, 2.5 meters in length according to user requirements. Foam plastic mold 4-5 is that EPS beads pass through pre-foaming, and in special-purpose molding machine, pass through solid type centrifugal casting mold 4 thermoplastic molding. The straight pipe section and the flange are split molded. The characteristic of foam plastic mold 4-5 is that it can be cut, assembled and bonded arbitrarily. The PN10 flange and straight pipe are spliced ​​into two semicircles according to the length of 2.5 meters, and two pieces are manufactured respectively;

[0119] B. Install the prepared 2 pieces of foam plastic mold 4-5 on the positionin...

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Abstract

The invention relates to a device and method for full mold centrifugal casting of a double-plate flange straight tube and a wall flange straight tube. The device comprises a centrifugal machine system, a quantitative pouring system, a dust removal system and a full mold centrifugal casting die, wherein a base is a steel plate formed by casting; a centrifugal machine supporting wheel assembly, a catch wheel assembly and a direct-current speed regulation motor assembly are respectively mounted on the base; the centrifugal machine supporting wheel assembly is fastened on the base through bolts and is connected with the direct-current speed regulation motor assembly through a transmission triangular belt; the catch wheel assembly is arranged below the center of a pipe die and is fastened on the base; a catch wheel rotating plate is arranged on the catch wheel assembly; bearings are mounted at two ends of a supporting wheel, and the supporting wheel and the bearings are mounted on a supporting wheel bearing block together; and bearing caps are mounted on the supporting wheel bearing block. Flexibility of the full mold casting is high, various workpieces can be casted by a die, the full mold casting meets requirements of different length specifications, different flange pressure grades and different wall flange positions, the molding yield is increased, the production efficiency is high, and batch production is realized. The device is applied to the technical field of centrifugal casting.

Description

technical field [0001] The present invention relates to a kind of equipment and method for centrifugal casting of double-disc flange straight pipe and wall-through flange straight pipe in the field of centrifugal casting technology, in particular to double-disk flange and wall-through flange straight pipe centrifugal one-type multiple piece casting. Background technique [0002] At present, most of the pressure-bearing water pipelines in the domestic and foreign markets use centrifugal ductile iron pipes. Due to the limitation of the difficulty of demoulding the double-disc flange and the through-wall flange in the metal mold, there are the following production methods for the double-disc flange and through-wall flange tubes supplied to the market: [0003] One, welded double disc flange pipe. The main problems of welding double-disk flange pipes: (1) The material of the weld seam is inconsistent with that of the cast pipe body, and the strength of the "heterogeneous" weld...

Claims

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Application Information

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IPC IPC(8): B22D13/02B22D13/10
CPCB22D13/023B22D13/10B22D13/101B22D13/107
Inventor 孙辉李会谦
Owner 营口经济技术开发区爱维尔铸业有限公司
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