Tapered eight-petal die for flaring of automobile exhaust elbow

Abstract

The utility model provides a conical eight-petal die for flaring an automobile exhaust elbow, which comprises a flaring die installed in an exhaust pipe flaring machine, the front end part of the flaring die is provided with a flaring section, the rear end of the flaring die is provided with a clamping section, the flaring section is conical, the clamping section is cylindrical, the flaring die is composed of eight equant and coaxial flaring units, and the flaring units are connected with the flaring die. Two elastic belts are arranged in the clamping section of the flaring die in a sleeved mode, the eight flaring units move in the radial direction along the axis and are attached to one another through the elastic belts, and a conical extrusion groove penetrating through the flaring die is formed in the flaring die along the axis. A plurality of friction strips surrounding the flaring section by a circle are arranged on the outer surface of the conical flaring section of the flaring die at equal intervals. The elbow pipe flaring device has the advantages of facilitating flaring at the end opening of the elbow pipe, being good in flaring efficiency and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts processing, in particular to a conical eight-petal die for expanding an automobile exhaust elbow. Background Art

[0002] The automobile exhaust pipe is installed in the exhaust pipe between the engine exhaust branch pipe and the muffler, making the entire exhaust system flexibly connected, thereby reducing vibration and noise, facilitating installation and extending the life of the exhaust muffler system. During the processing of the automobile exhaust pipe, after the exhaust pipe is formed, one end of the automobile exhaust pipe needs to be expanded.

[0003] The patent website discloses an exhaust pipe expansion device (Announcement No.: CN 220144554 U), including an expansion end head with an overall circular columnar structure, and also including a machine base, a base is provided on the machine base, and a pressure plate is detachably installed on the base, and an oil cylinder is also provided on the machine base, and a cone rod is provided at the end of the piston rod of the oil cylinder. The utility model adopts an expansion end head divided into a plurality of equally divided expansion units. When the exhaust pipe is expanded, its expansion section can first extend into the exhaust pipe, and then the cone rod is inserted into the conical hole to prop up each expansion unit, so as to expand the exhaust pipe from the inside to the outside along the radial direction of the exhaust pipe. During the expansion process, the expansion unit is uniformly expanded along the radial direction, so it can be automatically centered and positioned. After expansion, the transition section between the expansion end and the original exhaust pipe is relatively straight, which is convenient for subsequent welding processing, and during the expansion process, there is no axial friction between the expansion unit and the exhaust pipe wall, and the energy saving effect and expansion effect are better.

[0004] It can be seen from the above technology that the flaring end molds currently used in the market are divided into several flaring units, and they are all straight. The straight flaring end has a better effect when flaring the straight pipe port, but when flaring the port of the bent pipe, due to the curvature of the port of the bent pipe, it is easy to cause the flaring to be flat, thereby affecting the flaring effect. For this reason, we propose a conical eight-petal mold for flaring the automobile exhaust bent pipe. Utility Model Content

[0005] The utility model provides a conical eight-petal die for expanding an automobile exhaust elbow, so as to solve the problems raised in the background technology.

[0006] In order to solve the above problems, the utility model provides a conical eight-petal die for expanding an automobile exhaust elbow, comprising a expanding die installed in an exhaust pipe expanding machine, the front end of the expanding die is set as a expanding section, and the rear end is set as a clamping section, the expanding section is conical, and the clamping section is cylindrical, the expanding die is composed of eight equally divided and coaxial expanding units, two elastic bands are sleeved in the clamping section of the expanding die, and the elastic bands enable the eight expanding units to move radially along the axis and fit each other, and a conical extrusion groove that runs through the expanding die is opened inside the expanding die along the axis.

[0007] Preferably, the outer surface of the tapered expanding section of the expanding die is provided with a plurality of friction strips equidistantly surrounding the expanding section.

[0008] Preferably, two annular grooves are provided in the clamping section of the expansion die, and the two elastic bands are respectively arranged in one annular groove, and the elastic bands fit in the annular grooves.

[0009] The beneficial effects of adopting the above technical solution are:

[0010] 1. Through the conical design of the flaring section of the flaring mold, the port of the bent pipe can be flared in a conical shape, so that the port of the bent pipe is flared smoothly, which is convenient for subsequent welding.

[0011] 2. By providing a plurality of friction strips on the outer surface of the tapered expansion section, the friction between the expansion section and the inner wall of the elbow port can be increased, thereby making the expansion more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0013] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model.

[0014] Among them: 1-expanding die; 11-expanding section; 111-friction strip; 12-clamping section; 13-conical extrusion groove; 2-expanding unit; 3-elastic band; 31-annular groove. DETAILED DESCRIPTION

[0015] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0016] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, a movable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] like Figure 1-2 In the present embodiment, a conical eight-petal die for expanding an automobile exhaust elbow comprises a expanding die 1 installed in an exhaust pipe expanding machine, wherein the front end of the expanding die 1 is set as a expanding section 11, and the rear end is set as a clamping section 12, wherein the expanding section 11 is conical, and the clamping section 12 is cylindrical, and the expanding die 1 is composed of eight equally divided and coaxial expanding units 2, and two elastic bands 3 are sleeved in the clamping section 12 of the expanding die 1, and the elastic bands 3 make the eight expanding units 2 move radially along the axis and fit each other, and a conical extrusion groove 13 penetrating the expanding die 1 is opened inside the expanding die 1 along the axis.

[0019] Through the above technical scheme, when in use, the expanding die 1 is placed in the expanding machine, connected to the expanding machine through the clamping section 12, and then the expanding die 1 is inserted into the port of the exhaust elbow to position the exhaust elbow. Then, the expanding machine squeezes the expanding die 1 from the inside to the outside through the conical extrusion groove 13, so that the eight expanding units 3 move radially along the axis, thereby expanding the expanding section 11, and performing conical expansion on the port of the exhaust elbow. By dividing the expanding die 1 into eight expanding units 3, the force inside the port is more uniform, and the stability during expansion is increased. Since the expanding section 11 is conical, the curvature at the port of the elbow has less effect on the conical surface, so that the expansion is uniform and smooth, and the expansion efficiency is improved. After the expansion is completed, under the action of the elastic band 2, the eight expanding units 3 are gathered and fit together, which is convenient for removing the elbow from the expanding die and facilitating the next expansion work.

[0020] Preferably, a plurality of friction strips 111 surrounding the expanding section 11 are equidistantly disposed on the outer surface of the tapered expanding section 11 of the expanding die 1 .

[0021] Through the above technical solution, the setting of the friction strip 111 can increase the friction between the surface of the expansion section 11 and the inner wall of the elbow port, thereby increasing the stability during expansion and not easily causing deviation and affecting the expansion effect.

[0022] Preferably, two annular grooves 31 are formed in the clamping section 12 of the expansion die 1 , and the two elastic bands 3 are respectively disposed in one annular groove 31 , and the elastic bands 3 fit in the annular groove 21 .

[0023] Through the above technical solution, the annular groove 31 is provided to limit the elastic band 3 to prevent the elastic band 3 from deviating, thereby ensuring that the eight expansion units 2 can stably move radially along the axis and fit each other.

[0024] Finally, it should be noted that the above implementation cases are only used to illustrate the present invention, rather than to limit the technical solutions described in the present invention; therefore, although this specification has described the present invention in detail with reference to the above-mentioned embodiments, ordinary technicians in this field should understand that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention; technologies not described in detail in the present invention are implemented with existing technologies.

Claims

1. A conical eight-petal die for expanding an automobile exhaust elbow, comprising an expanding die installed in an exhaust pipe expanding machine, wherein the front end of the expanding die is set as an expanding section, and the rear end is set as a clamping section, characterized in that: The expanding section is conical, the clamping section is cylindrical, the expanding die is composed of eight equally divided and coaxial expanding units, two elastic bands are sleeved in the clamping section of the expanding die, the elastic bands enable the eight expanding units to move radially along the axis and fit each other, and a conical extrusion groove that runs through the expanding die is opened inside the expanding die along the axis.

2. The tapered eight-petal die for expanding the exhaust elbow of an automobile according to claim 1, characterized in that: The outer surface of the conical expanding section of the expanding die is provided with a plurality of friction strips which surround the expanding section at equal intervals.

3. The tapered eight-petal die for expanding the exhaust elbow of an automobile according to claim 1, characterized in that: Two annular grooves are provided in the clamping section of the expansion die, and the two elastic bands are respectively arranged in one annular groove, and the elastic bands fit in the annular grooves.

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