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Large arc casting calibrating method

A calibration method and an arc-shaped technology are applied in the field of calibration of large arc-shaped castings, which can solve the problems of complex tooling equipment, potential safety hazards, and difficult tooling, etc., and achieve the effects of low cost, no potential safety hazards, and convenient operation.

Inactive Publication Date: 2011-06-22
衡阳中钢衡重铸锻有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is difficult to install and has potential safety hazards. It is necessary to prevent the weight iron on the large wedge-shaped iron from toppling over; the tooling equipment is complicated, and special stoppers (21, 25) and wedge iron 23 are required; high energy consumption

Method used

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  • Large arc casting calibrating method

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Such as Figure 1-2 As shown, a kind of rotary kiln half gear casting, material ZG35SiMn, blank weight 20500kg, surface hardness requirement is HB190~230, inner circle size Φ7220mm, wheel flange thickness 190mm, the design requires that the wheel flange thickness should be uniform after processing, and its opening deviation should not be allowed If it exceeds 5% of the design size on the drawing, it is found that the opening size is about 30mm away from the cross-line measurement and needs to be corrected.

[0039] First cut one end of the brace 11, leaving a gap of 50-60mm. The whole is heated to 500-550℃ for 8h, then it is quickly hung out of the furnace and placed on a flat plate. figure 1 The shown inner zone 13 is evenly blown and cooled, and the size of the opening is measured to find that the size is shrinking (that is, the size becomes smaller). When the size is reduced to about 38mm (including the linear expansion size), the gap 12 is filled with wedge iron or thin...

Embodiment 2

[0041] Such as Figure 1-2 As shown, a rotary kiln half gear casting is made of ZG42CrMo, the rough weight is 20500kg, the surface hardness is required to be above HB200, the outer circle size is Φ7600mm, and the rim thickness is 180mm. The design requires that the thickness of the rim after processing should be uniform, and the opening deviation should not be allowed. It is more than 5% of the size shown in the figure; the opening size of the rotary kiln half-gear castings is found to be shrunk by about 60mm after the crossed measurement, and correction is needed.

[0042] First cut one end of the lacing bar 11, heat the whole into the furnace and heat it to 500~550℃ for 8.5h and then hung it off quickly. At the same time, put a pile of coke on the flat ground and ignite it with an oxygen-propane flame, insert a duct for ventilation to keep burning ;will figure 1 The inner zone 13 shown is placed flat on the burning coke and heated, and the movable air pipe pair is held manually...

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Abstract

The invention discloses a large arc casting calibrating method, which comprises the following process steps: 1, measuring the size of the opening of a large arc casting (1); 2, cutting the tie bar (11) of the large arc casting (1) to form a gap (12); 3, heating the entire large arc casting (1) to 500 to 550 DEG C in a furnace, keeping temperature for 8 to 8.5 hours and removing the large arc casting (1) out of the furnace; 4, performing local cooling on an inner side area (13) or an outer side area (14); and 5, when the size of the opening of the large arc casting (1) reaches a design size ofthe opening, fully filling the gap (12) in the tie bar (11) with a weldable material, and firmly welding quickly; and performing distressing and annealing treatment. The method has high calibration precision, adopts simple process steps, requires low process equipment conditions and requires low energy consumption. The method is particularly suitable for calibrating semicircle gears of rotary cement kilns.

Description

technical field [0001] The invention relates to a method for correcting large castings, in particular to a method for correcting large arc castings. Background technique [0002] For the large gear of the cement rotary kiln, its size is large, and it is often difficult to cast it at one time. When casting, generally two semi-circular arc-shaped castings (hereinafter referred to as semi-circular gears) are cast separately. The openings of the semi-circular arc-shaped castings are generally It is cast with tie bars to limit the size of the opening, that is, the large gear of the cement rotary kiln is composed of two semicircular gears. However, the structure of the semicircular casting is complex, even if a tie bar is cast between the openings of the semicircular casting, it is still difficult to prevent the semicircular casting from being deformed. The common deformation conditions of semi-circular arc castings are that the opening size becomes larger (that is, the size runs...

Claims

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Application Information

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IPC IPC(8): C21D8/00
Inventor 谢驰中刘友成刘文军刘振王灿
Owner 衡阳中钢衡重铸锻有限公司
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