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Bend forming method for exhaust manifold

An exhaust manifold, bending and forming technology, applied in the field of exhaust manifold bending tools, can solve the problems of reducing the ability of pipe fittings to withstand internal pressure, scrapping the exhaust pipe, reducing the bending process accuracy, etc., to ensure stable performance, The effect of avoiding scrap and increasing practicality

Inactive Publication Date: 2015-07-22
CHENGDU LINGCHUAN SPECIAL IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of bend defects can have a large negative impact on the quality of bent pipe fittings
The thinning of the pipe wall will inevitably reduce the ability of the pipe to withstand internal pressure and affect its practical performance; on the one hand, the distortion of the cross-sectional shape of the curved pipe may cause the reduction of the cross-sectional area, thereby increasing the resistance of fluid flow, and on the other hand, it will also affect the pipe fittings. The functional effect in the structure; the wrinkling of the inner wall of the pipe will not only weaken the strength of the pipe, but also easily cause the uneven velocity of the flowing medium, generate eddy currents and accumulate dirt in the bending part, which will affect the normal use of the bent pipe fittings; the rebound phenomenon will inevitably make the bending of the pipe The angle is greater than the predetermined angle, thereby reducing the precision of the bending process
In order to meet the processing requirements of the exhaust pipe, the staff also need to proofread the bent pipe fittings. During the proofreading process, due to the low precision of manual operation, it is easy to cause the pipe fittings to break directly, or there will be obvious cracks at the bend of the pipe fittings. Depression or cracks will lead to the scrapping of the exhaust pipe, and in the process of operation, it takes a long time, the waste of materials is serious, and the labor intensity of workers is greatly increased

Method used

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  • Bend forming method for exhaust manifold
  • Bend forming method for exhaust manifold
  • Bend forming method for exhaust manifold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as Figure 1 to Figure 4 As shown, this embodiment includes the following steps:

[0030] (A) Pass the exhaust pipe through the gap formed by the trapezoidal groove and the elbow groove, and fix one end of the exhaust pipe with the exhaust pipe clamp;

[0031] (B) The end of the connecting rod on the rotating handle matches the trapezoidal groove on the roller seat. When the rotating handle is pressed down, the connecting rod will slide a certain distance in the trapezoidal groove to ensure that the force on the roller seat is even. The multiple rollers installed on the top increase the contact area between the guide groove and the bend of the exhaust pipe, and ensure that the force on the bend is uniform to reduce the direct breakage of the exhaust pipe or the obvious cracking at the bend of the exhaust pipe. The phenomenon of depression or crack occurs;

[0032] (C) The fixed part is installed on the rotating disk through the rotation of the rotating shaft. The...

Embodiment 2

[0038] Such as Figure 1 to Figure 2 As shown, on the basis of Embodiment 1, this embodiment further includes a plurality of torsion springs 12 , and the two ends of the torsion springs 12 are respectively connected to the rotating disk 1 and the rotating handle 6 . The two ends of the installed torsion spring 12 are respectively connected to the rotary disk 1 and the rotary handle 6. After the exhaust manifold 13 is bent, the torsion spring 12 returns to its elasticity, driving the lower pressure seat 8 to return to its original position, so that the device can continue to perform new operations. Exhaust manifold 13 pipe bending process.

Embodiment 3

[0040] Such as Figure 5 to Figure 7 As shown, in this embodiment, on the basis of Embodiment 1, the fixed part is the superior arc groove 21, the movable part is the inferior arc groove 24, and the vertical side and the end point of the inferior arc groove 24 The angle formed by the tangent to the arc surface is 50°, 60° or 85°. Since the bending angle of the exhaust manifold 13 changes little, the lower pressure seat 8 faces the elbow part of the exhaust manifold 13 during operation, and the movable part is a inferior arc groove 24, so that the exhaust manifold 13 acts as a push force on the cylinder 4. Bending within a small range can be realized to ensure the strength of the bending place, avoid obvious depressions at the bending place due to concentrated force, and ensure the quality of the bend pipe of the exhaust manifold 13; as a preference, when the inferior arc is concave When the angle formed by the vertical side of the groove 24 and the tangent line from the end p...

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PUM

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Abstract

The invention discloses a bend forming method for an exhaust manifold. The bend forming method for the exhaust manifold comprises a rotating disk. A pipe bending groove is formed in the rotating disk. Multiple pressing blocks are arranged in a pressing seat. The lower pressing blocks are provided with guide grooves matched with the pipe bending groove. Blind holes are formed in the guide grooves. Rollers are arranged in the blind holes in a rotating mode. Through holes are formed in the two inner side walls of each blind hole. A rotating shaft of each roller is in clearance fit with the corresponding through hole. A rubber mat is installed between each roller and the bottom of the corresponding blind hole. The pipe bending groove is composed of a movable portion and a fixed portion, wherein the fixed portion is arranged on the rotating disk in a rotating mode, the movable portion is provided with a protrusion, the fixed portion is provided with a groove, and the protrusion is matched with the groove. According to the bend forming method, the blind holes are formed in the guide grooves, the rollers are installed in the blind holes and higher than the bottoms of the guide grooves, the protruding round faces of the rollers can eliminate gathering wrinkling of the exhaust manifold at an inwards bending position, metal is promoted to extend, so that it is guaranteed that the bent portion is flat, and the phenomena that the arc inner side wrinkles and bending springback is generated are avoided.

Description

technical field [0001] The invention relates to an exhaust manifold bending tool, in particular to a method for bending and forming the exhaust manifold. Background technique [0002] The exhaust angle of motor vehicle exhaust pipes has always been a difficult problem for professional manufacturers. According to the survey, the angle direction of the exhaust pipes of cars and light family cars is generally backward and parallel to the ground, while the angle of the exhaust pipes of high-power transport vehicles and agricultural vehicles is bent to the ground. From the perspective of environmental protection, according to the current angular direction design and mechanical design principles of motor vehicle exhaust pipes, no new angular discharge design method has been stipulated. [0003] In the process of processing the exhaust pipes of high-power transport vehicles, the pipe benders on the market are usually used to bend the exhaust pipes. However, most of the pipe bender...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D7/03B21D7/16B21D53/88
CPCB21D7/03B21D7/16B21D53/88
Inventor 张军叶维敏汪庭文何晓鸣杨军
Owner CHENGDU LINGCHUAN SPECIAL IND