A multi-stage sizing device for automobile exhaust system pipes

Abstract

The utility model discloses a kind of automobile exhaust system pipe fitting multistage sizing device, comprising: sizing die holder, which is provided with circular recess and mounting groove that are interconnected on it;Die sleeve, its outer surface is provided with stepped forming section, internally is provided with cavity, the die sleeve includes multiple petal dies, the bottom of any petal die is limited in the circular recess by annular cover plate;Multiple limiting grooves are provided on the outer wall of the die sleeve, and the limiting groove is provided with elastic rubber ring;Inner cone stick, which is inverted polygonal pyramid structure, the inner cone stick is located in the cavity of the die sleeve, and the inner cone stick moves along the axial direction of the die sleeve under the drive of hydraulic drive system.The utility model can realize the purpose of sizing and rounding of pipe fitting with different diameters at one time by setting stepped forming section on the outer surface of die sleeve, solve the problem of needing to disassemble and assemble multiple times during sizing process when pipe fitting has different diameter sections, and reduce the labor intensity of operator.

Description

Technical Field

[0001] This utility model relates to the field of automotive exhaust system pipe fitting processing equipment. More specifically, this utility model relates to a multi-stage sizing device for automotive exhaust system pipe fittings. Background Technology

[0002] In the production and manufacturing of automotive exhaust system pipes and various other pipe fittings, sizing is a crucial process. Sizing dies are used to calibrate the dimensions of metal pipes. Traditional sizing dies can often only calibrate a single dimension, meaning that one set of dies can only calibrate a fixed diameter of the pipe fitting. If the pipe fitting has a stepped multi-diameter design, multiple sets of sizing dies are required, and the pipe fitting is sizing by changing the dies multiple times in a step-by-step manner. This process requires multiple disassembly and replacement of dies, making the operation cumbersome, the production efficiency low, and the labor intensity of the operators high. Summary of the Invention

[0003] Another objective of this invention is to provide a multi-stage sizing device for automotive exhaust system pipes, in order to solve the problems of different diameters at different locations of the same pipe, repeated installation and disassembly required during multiple sizing processes, low production efficiency, and high labor intensity for operators.

[0004] To achieve these objectives and other advantages according to this utility model, a multi-stage sizing device for automotive exhaust system pipes is provided, comprising:

[0005] A sizing die holder has a circular groove on its top surface and a mounting groove on its bottom surface that communicates with the circular groove. The diameter of the circular groove is larger than the diameter of the mounting groove.

[0006] The mold sleeve is a sleeve structure with an inverted T-shaped axial section. The outer surface of the sleeve is provided with stepped forming sections and the interior is provided with cavities. The mold sleeve includes multiple petal molds, which are spaced apart along the circumference of the circular groove. The bottom of any petal mold is limited within the circular groove by an annular cover plate, which is detachably installed on the top surface of the sizing mold base. Multiple limiting grooves are provided at intervals along the axial direction on the outer wall of the mold sleeve. Each limiting groove is opened along the circumference of the mold sleeve, and an elastic rubber ring is sleeved inside the limiting groove.

[0007] The inner conical rod has an inverted polygonal pyramidal structure. The inner conical rod is located in the cavity of the mold sleeve and is coaxially arranged with the mold sleeve. The outer wall of the inner conical rod is clearance-fitted with the inner wall of the mold sleeve. The inner conical rod moves along the axial direction of the mold sleeve under the drive of the hydraulic drive system.

[0008] Preferably, a guide rail is embedded in the inner wall of any of the valves along its axial direction, and a sliding key block is embedded in the conical surface corresponding to the inner conical rod, the sliding key block being slidably disposed on the guide rail.

[0009] Preferably, the upper part of the inner conical rod is provided with a first oil injection hole and a plurality of second oil injection holes. The oil inlet of the first oil injection hole penetrates through the top surface of the inner conical rod, and the oil outlet communicates with the oil inlets of the plurality of second oil injection holes. The oil outlets of the plurality of second oil injection holes respectively penetrate through a plurality of conical surfaces of the inner conical rod.

[0010] Preferably, an oil-draining groove is provided on any conical surface of the inner conical rod, and the oil-draining groove is connected to the oil outlet of the second oil injection hole on the corresponding conical surface.

[0011] Preferably, the bottom of the inner cone rod is connected to the free end of the hydraulic drive system via a first nut, and a second nut is provided in the mounting groove. The outer diameter of the first nut is larger than the inner diameter of the second nut, and the first nut is located above the second nut.

[0012] Preferably, the first nut, the inner conical bar, and the second nut are coaxially arranged, and the inner circumference of the second nut is clearance-fitted with the outer circumference of the free end of the hydraulic drive system.

[0013] This utility model has at least the following beneficial effects:

[0014] 1. This utility model can achieve the purpose of sizing and rounding different diameter pipe fittings in one go by setting a stepped forming section on the outer surface of the mold sleeve. This solves the problem that multiple disassembly and assembly are required during the sizing process when the pipe fittings have different diameters, and reduces the labor intensity of operators.

[0015] 2. This utility model embeds a guide rail on the mold and a sliding key block on the inner cone rod. The sliding key block is slidably connected to the guide rail, so that when the inner cone rod moves axially in the cavity of the mold sleeve, it plays a guiding role. The inner cone rod can uniformly expand the mold sleeve outward, ensuring the sizing and rounding accuracy.

[0016] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a multi-stage sizing device for automotive exhaust system pipes according to an embodiment of the present invention;

[0018] Figure 2 This is a cross-sectional view of the multi-stage sizing device for automotive exhaust system pipes described in the above embodiments;

[0019] Figure 3 This is a schematic diagram of the structure of the mold described in the above embodiments;

[0020] Figure 4This is a schematic diagram of the inner conical rod described in the above embodiments;

[0021] Explanation of reference numerals on the accompanying drawings:

[0022] 1. Sizing mold base; 101. Circular groove; 102. Mounting groove; 103. Cover plate; 2. Mold sleeve; 201. Petal mold; 202. Stepped forming section; 203. Limiting groove; 204. Guide rail; 3. Inner cone bar; 301. Sliding key block; 302. First oil injection hole; 303. Second oil injection hole; 304. Oil drainage groove; 4. First nut; 5. Second nut. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0024] It should be noted that in the description of this utility model, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] like Figure 1-4 As shown, this utility model provides a multi-stage sizing device for automotive exhaust system pipes, comprising:

[0026] The sizing mold base 1 has a circular groove 101 on its top surface and a mounting groove 102 on its bottom surface that communicates with the circular groove 101. The diameter of the circular groove 101 is larger than the diameter of the mounting groove 102.

[0027] The mold sleeve 2 is a sleeve structure with an inverted T-shaped axial section. The outer surface of the sleeve is provided with a stepped forming section 202 and the inside is provided with a cavity. The mold sleeve 2 includes a plurality of petal molds 201, which are spaced apart along the circumference of the circular groove 101. The bottom of any petal mold 201 is limited within the circular groove 101 by an annular cover plate 103. The annular cover plate 103 is detachably installed on the top surface of the sizing mold base 1. A plurality of limiting grooves 203 are spaced apart along the axial direction on the outer wall of the mold sleeve 2. Any limiting groove 203 is opened along the circumference of the mold sleeve 2, and an elastic rubber ring is sleeved inside the limiting groove 203.

[0028] The inner conical rod 3 has an inverted polygonal pyramidal structure. The inner conical rod 3 is located in the cavity of the mold sleeve 2 and is coaxially arranged with the mold sleeve 2. The outer wall of the inner conical rod 3 is clearance-fitted with the inner wall of the mold sleeve 2. The inner conical rod 3 moves along the axial direction of the mold sleeve 2 under the drive of the hydraulic drive system.

[0029] In the above technical solutions, such as Figure 1 , Figure 2As shown, the multi-stage sizing device for automotive exhaust system pipes consists of a sizing mold base 1, an inner cone rod 3, and a mold sleeve 2. The sizing mold base 1 has interconnected circular grooves 101 and mounting slots 102. The circular grooves 101 are used for limiting the installation of the mold sleeve 2. The mold sleeve 2 is composed of multiple petal molds 201, which are evenly spaced in a ring and installed within the circular grooves 101. An annular cover plate 103 is installed on the top surface of the circular grooves 101. The annular cover plate 103 is detachably installed on the top surface of the sizing mold base 1 by bolts. The annular cover plate 103 is used to limit the bottom of the petal molds 201 within the circular grooves 101. The inner cone rod 3 is located within the cavity of the mold sleeve 2. The free end of the hydraulic drive system... The bottom of the mounting groove 102 extends into and connects to the bottom of the inner cone rod 3. The inner cone rod 3 is driven to rise or fall axially along the mold sleeve 2 via a hydraulic drive system. An elastic rubber ring is fitted on the outer wall of the mold sleeve 2. The elastic contraction force of the elastic rubber ring can reduce the distance between multiple mold segments 201, causing the mold sleeve 2 to be in a contracted state, achieving the purpose of pre-tightening the mold. The multi-stage sizing device is mounted above the hydraulic drive system via a mounting bracket. The free end of the hydraulic drive system is connected to the bottom of the inner cone rod 3. The sizing process of the pipe fitting to be sizing using the multi-stage sizing device of this utility model is as follows: During sizing, the hydraulic drive system is first activated to push the inner cone rod 3 upwards. Since the inner cone rod 3 has an inverted polygonal pyramidal structure, it... During the upward movement, the diameter of the contact surface between the inner conical rod 3 and the multiple petal molds 201 gradually decreases. The mold sleeve 2 is in a tightened state under the action of the elastic rubber ring. The diameter of the mold sleeve 2 is smaller than the diameter of the pipe to be sized. The pipe to be sized is placed on the mold sleeve 2. Then, the hydraulic drive system is driven to move the inner conical rod 3 downward. Under the action of the inner conical rod 3, the diameter of the contact surface between the inner conical rod 3 and the multiple petal molds 201 gradually expands. The multiple petal molds 201 and the elastic rubber ring expand outward at the same time, and the diameter gradually increases. Under the pushing action of the petal molds 201, the pipe to be sized is subjected to outward tension and changes shape to match the expanded mold sleeve 2, finally achieving the purpose of sizing and rounding. The outer surface of the mold sleeve 2 is provided with steps. After the corresponding positions of the pipe fitting and the mold sleeve 2 are formed in the forming section 202, the pipe fitting reaches the transition of different diameters, that is, different pipe fitting sections have different diameters. After the sizing and rounding are completed, the inner cone bar 3 moves upward again under the lifting action of the hydraulic drive system. The mold sleeve 2 gradually returns to the contracted state under the action of the rebound force of the rubber ring. The operator takes out the pipe fitting. Thus, a complete sizing and rounding process is completed. This utility model can achieve the purpose of sizing and rounding different diameter pipe fittings in one go by setting the stepped forming section 202 on the outer surface of the mold sleeve 2. It solves the problem that multiple disassembly and assembly are required during the sizing process when there are different diameter pipe fittings, and reduces the labor intensity of the operators.Eight ferrules 201 are provided. The inner cone rod 3 is an inverted octagonal pyramid. The hydraulic drive system is a hydraulic cylinder. The initial state of the sizing device is when the mold sleeve 2 is in a tightened state. When the mold sleeve 2 is expanded, it is in a working state. In the initial state, the pipe to be sizing is directly placed on the mold sleeve 2. Then, the hydraulic drive system is activated to lower the inner cone rod 3 until the mold sleeve 2 is in the working state to round the pipe. After rounding, the hydraulic drive system moves the inner cone rod 3 back up to the initial state of the mold sleeve 2, removes the pipe, and waits for the next rounding. The hydraulic cylinder can be set with corresponding lifting and lowering strokes according to the sizing conditions.

[0030] In another technical solution, a guide rail 204 is embedded in the inner wall of any of the flap molds 201 along its axial direction, and a sliding key block 301 is embedded in the conical surface corresponding to the inner cone rod 3. The sliding key block 301 is slidably disposed on the guide rail 204.

[0031] In this technical solution, such as Figure 2 , Figure 3 As shown, each petal mold 201 is fitted with a guide rail 204, and each conical surface of the inner conical rod 3 is fitted with a sliding key block 301. The sliding key block 301 is slidably connected to the guide rail 204, so that when the inner conical rod 3 moves axially in the cavity of the mold sleeve 2, it plays a guiding role. The inner conical rod 3 can uniformly expand the mold sleeve 2 outward to ensure the sizing and rounding accuracy.

[0032] In another technical solution, the upper part of the inner conical rod is provided with a first oil injection hole 302 and a plurality of second oil injection holes 303. The oil inlet of the first oil injection hole 302 penetrates through the top surface of the inner conical rod, and the oil outlet is connected to the oil inlet of the plurality of second oil injection holes 303. The oil outlets of the plurality of second oil injection holes 303 respectively penetrate through a plurality of conical surfaces of the inner conical rod. An oil drainage groove 304 is provided on any conical surface of the inner conical rod, and the oil drainage groove 304 is connected to the oil outlet of the second oil injection hole 303 on the corresponding conical surface.

[0033] In this technical solution, such as Figure 2 , Figure 4 As shown, by providing a first oil injection hole 302, a second oil injection hole 303, and an oil drain groove 304, lubricating oil can be injected from the top of the inner cone rod 3 into the first oil injection hole 302. The lubricating oil flows into the oil drain groove 304 through the second oil injection hole 303, thereby achieving lubrication between the flap mold 201 and the inner cone rod 3, reducing the friction between the inner cone rod 3 and the mold sleeve 2, preventing relative wear, and improving the service life of the device. The oil drain groove 304 is X-shaped. The X-shaped oil drain groove 304 can make the lubricating oil form a multi-directional oil film distribution on the surface of the inner cone rod 3 and the mold sleeve 2, avoiding the occurrence of lubrication blind spots when the inner cone rod 3 moves up or down. Multiple oil drain grooves 304 are provided, which are spaced apart along the axial direction of the corresponding cone surface.

[0034] In another technical solution, the bottom of the inner cone rod 3 is connected to the free end of the hydraulic drive system through a first nut 4, and a second nut 5 is provided in the mounting groove 102. The outer diameter of the first nut 4 is larger than the inner diameter of the second nut 5, and the first nut 4 is located above the second nut 5.

[0035] In this technical solution, such as Figure 2 As shown, an external thread can be machined on the outer periphery of the free end of the hydraulic drive system. The bottom of the inner cone bar 3 is welded with a first nut 4. The free end of the hydraulic drive system is connected to the first nut 4 by screwing. The second nut 5 is set below the first nut 4. The free end of the hydraulic drive system extends out of the top of the second nut 5 and connects with the first nut 4. The second nut 5 is used to limit the downward stroke of the inner cone bar 3. When the pipe to be sized is sleeved on the mold sleeve 2, the hydraulic drive system drives the inner cone bar 3 to descend. When it descends to the point where the first nut 4 and the second nut 5 abut, the pipe to be sized completes the sizing and rounding operation.

[0036] In another technical solution, the first nut 4, the inner cone bar 3, and the second nut 5 are coaxially arranged, and the inner circumference of the second nut 5 is clearance-fitted with the outer circumference of the free end of the hydraulic drive system.

[0037] In this technical solution, the second nut 5 is clearance-fitted with the free end of the hydraulic drive system. The second nut 5 can be used to laterally limit the free end of the hydraulic drive system, preventing the free end of the hydraulic drive system from swaying during the lifting or lowering process, which would cause the inner cone bar 3 to not move axially along the central axis of the mold sleeve 2, thus resulting in poor sizing and rounding accuracy.

[0038] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A multi-stage sizing device for automotive exhaust system pipe fittings, characterized in that, include: A sizing die holder has a circular groove on its top surface and a mounting groove on its bottom surface that communicates with the circular groove. The diameter of the circular groove is larger than the diameter of the mounting groove. The mold sleeve is a sleeve structure with an inverted T-shaped axial section. The outer surface of the sleeve is provided with stepped forming sections and the interior is provided with cavities. The mold sleeve includes multiple petal molds, which are spaced apart along the circumference of the circular groove. The bottom of any petal mold is limited within the circular groove by an annular cover plate, which is detachably installed on the top surface of the sizing mold base. Multiple limiting grooves are provided at intervals along the axial direction on the outer wall of the mold sleeve. Each limiting groove is opened along the circumference of the mold sleeve, and an elastic rubber ring is sleeved inside the limiting groove. The inner conical rod has an inverted polygonal pyramidal structure. The inner conical rod is located in the cavity of the mold sleeve and is coaxially arranged with the mold sleeve. The outer wall of the inner conical rod is clearance-fitted with the inner wall of the mold sleeve. The inner conical rod moves along the axial direction of the mold sleeve under the drive of the hydraulic drive system.

2. The multi-stage sizing device for automotive exhaust system pipes as described in claim 1, characterized in that, The inner wall of any of the valves is fitted with a guide rail along its axial direction, and a sliding key block is fitted on the conical surface corresponding to the inner conical rod. The sliding key block is slidably mounted on the guide rail.

3. The multi-stage sizing device for automotive exhaust system pipes as described in claim 1, characterized in that, The upper part of the inner conical rod is provided with a first oil injection hole and a plurality of second oil injection holes. The oil inlet of the first oil injection hole penetrates through the top surface of the inner conical rod, and the oil outlet is connected to the oil inlet of the plurality of second oil injection holes. The oil outlets of the plurality of second oil injection holes respectively penetrate through the plurality of conical surfaces of the inner conical rod.

4. The multi-stage sizing device for automotive exhaust system pipes as described in claim 3, characterized in that, An oil-draining groove is provided on any conical surface of the inner conical rod, and the oil-draining groove is connected to the oil outlet of the second oil injection hole on the corresponding conical surface.

5. The multi-stage sizing device for automotive exhaust system pipes as described in claim 1, characterized in that, The bottom of the inner cone rod is connected to the free end of the hydraulic drive system via a first nut. A second nut is provided in the mounting groove. The outer diameter of the first nut is larger than the inner diameter of the second nut, and the first nut is located above the second nut.

6. The multi-stage sizing device for automotive exhaust system pipes as described in claim 5, characterized in that, The first nut, the inner conical bar, and the second nut are coaxially arranged, and the inner circumference of the second nut is clearance-fitted with the outer circumference of the free end of the hydraulic drive system.

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