Pipe bending die and machining method thereof

Abstract

The pipe bending die comprises a wheel die, a clamping die and a guide die, the wheel die is provided with a first-layer clamping groove and a second-layer clamping groove which are distributed in the axial direction of the wheel die, the clamping die is provided with a lower-layer clamping groove and an upper-layer clamping groove, and the clamping die can move in the direction close to or away from the wheel die; the first-layer clamping groove and the lower-layer clamping groove can form a first machining cavity for machining a second bent pipe section, and the second-layer clamping groove and the upper-layer clamping groove can form a second machining cavity for machining a first bent pipe section; a first guide groove and a second guide groove are formed in the guide die so that the first guide groove or the second guide groove can abut against the thin pipe section, close to the clamping part, of the reducer pipe. A positioning block is installed on the wheel die and used for positioning the position of the reducer pipe. The pipe fitting can be accurately positioned through the arrangement of the positioning block, and the machining precision is improved and the die cost is reduced by turning around the pipe fitting and machining the symmetrical bent pipe sections of the pipe fitting.

Description

Technical Field

[0001] This invention relates to the field of pipe bending and forming technology, and in particular to a pipe bending mold and its processing method. Background Technology

[0002] Motorcycle handlebar reducers are a type of motorcycle modification part. Their diameter varies in different areas and they undergo a bending process, resulting in better strength, shock absorption, and ergonomic design compared to ordinary straight handlebars. They are a crucial component of the motorcycle's control system, and their shape precision directly affects the motorcycle's handling performance (e.g., ...). Figure 1 The process includes, in sequence, a thin tube section 1, a first bend section 2, a reducing section 3, a second bend section 4, and a thicker tube section 5. On the other side of the thicker tube section 5 are symmetrically located bend sections 4, 3, 2, and 1. Bending is a critical process in the manufacturing of motorcycle handlebars. Traditional bending dies suffer from inaccurate positioning and poor bending consistency, leading to unstable product quality and low production efficiency.

[0003] A search revealed that Chinese patent application number CN201911152267.1, entitled "A Forming Method for an Elliptical Bending Tube with Complex Cross-Sectional Perimeter Variation," discloses a bending mold that uses a small-diameter pipe base to expand and form a larger-diameter section. The shortcoming of this patent is that it is easy to achieve a single bend for a single pipe, but it is inconvenient to process pipes with multiple bends. Summary of the Invention

[0004] To address the technical problems existing in the background art, this invention proposes a pipe bending mold and its processing method.

[0005] The present invention proposes a pipe bending mold, which includes a wheel mold, a clamping mold and a guide mold. Unlike the prior art, this mold is used to process the first and second pipe bending sections on a variable diameter pipe with a thicker pipe section.

[0006] The wheel mold has a first layer of clamping grooves and a second layer of clamping grooves distributed along its axial direction. The clamping mold has a lower layer of clamping grooves and an upper layer of clamping grooves. The clamping mold can move towards or away from the wheel mold.

[0007] The first layer clamping groove and the lower layer clamping groove can form a first processing cavity for processing the second bent pipe section, and the second layer clamping groove and the upper layer clamping groove can form a second processing cavity for processing the first bent pipe section.

[0008] The guide mold has a first guide groove and a second guide groove. The guide mold can move towards or away from the wheel mold so that the first guide groove or the second guide groove can press against the thin tube section of the variable diameter tube near the clamping part.

[0009] The wheel mold is equipped with a positioning block, which is used to position the variable diameter pipe.

[0010] As a further optimization of the present invention, the positioning block has a first positioning opening for positioning with the thicker section of the variable diameter pipe.

[0011] As a further optimization of the present invention, the positioning block has a second positioning opening for positioning the second bent pipe section for forming on one side.

[0012] As a further optimization of the present invention, the positioning block is used to assist in positioning the variable diameter tube in the first processing cavity.

[0013] A pipe bending process, using the aforementioned mold, includes the following steps:

[0014] S1. The first end of the variable diameter tube is clamped, and the clamping mold and guide mold move toward the wheel mold, so that the variable diameter tube has a portion located in the first processing cavity and the first guide groove;

[0015] S2. The wheel mold and clamping mold rotate synchronously to achieve the processing of the second bend section of the variable diameter pipe;

[0016] S3. Move the clamping mold, guide mold, and wheel mold to separate them from the reducing tube. Rotate the reducing tube and then move the clamping mold, guide mold, and wheel mold again to position the reducing tube within the second processing cavity and the second guide groove.

[0017] S4. The wheel mold and clamping mold rotate synchronously to process the first bend section of the variable diameter pipe;

[0018] S5. Move the clamping mold, guide mold and wheel mold to separate the three from the reducer tube, remove the reducer tube, and reverse and clamp the second end of the reducer tube.

[0019] S6. Move the clamping mold, guide mold, and wheel mold so that the variable diameter tube has a portion located in the first processing cavity, and the positioning block positions the variable diameter tube.

[0020] S7. The wheel mold and clamping mold rotate synchronously to achieve the processing of the second bend section at the second end of the variable diameter pipe;

[0021] S8. Move the clamping mold, guide mold, and wheel mold to separate them from the reducing tube. Rotate the reducing tube and then move the clamping mold, guide mold, and wheel mold again to position the reducing tube in the second processing cavity and the second guide groove.

[0022] S9. The wheel mold and clamping mold rotate synchronously to process the first bend section of the second end of the variable diameter pipe;

[0023] Then move the clamping mold, guide mold, and wheel mold to detach them from the reducer, and remove the reducer.

[0024] This method involves initial positioning and machining of the second bend, adjusting the position and machining the first bend, removing the part, turning it around, and repositioning it. A positioning block is used to assist in positioning and machining the second bend at the other end. Then, the position is adjusted and the first bend at the other end is machined. The resulting variable-diameter bend, after inspection, meets the process standards for bending angles and pipe diameter deformation in each section.

[0025] As a further optimization of the present invention, the thicker section of the reducing pipe in step S1 contacts the positioning block.

[0026] As a further optimization of the present invention, the movable clamping mold, guide mold and wheel mold include moving the clamping mold, guide mold and wheel mold in the vertical and horizontal directions.

[0027] As a further optimization of the present invention, the clamping mold and the guide mold move synchronously in the horizontal direction.

[0028] As a further optimization of the present invention, in step S6, the moving wheel mold is used to make the first layer clamping groove contact the variable diameter pipe, and at the same time the variable diameter pipe is manually adjusted so that the second bend pipe section and the thick pipe section processed in step S2 contact the positioning block.

[0029] The bending mold and its processing method proposed in this invention can be used to process motorcycle variable diameter handlebars. The bending of the variable diameter tube by the mold can better clamp the variable diameter tube and effectively ensure the bending dimensional accuracy.

[0030] By using positioning blocks to position the reducer tube, efficient and precise bending processing is achieved. This effectively ensures the consistency of bending of the symmetrical parts at both ends, improving product quality. At the same time, the device is easy to operate, increasing production efficiency, and the adjustable auxiliary positioning block assembly can adapt to different specifications of motorcycle reducers, enhancing the device's versatility.

[0031] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may become apparent by practice of the invention. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a motorcycle handlebar structure in the prior art;

[0033] Figure 2 This is a schematic diagram of the mold structure for pipe bending processing according to the present invention;

[0034] Figure 3 For the present invention Figure 2 Another structural diagram;

[0035] Figure 4 This is a schematic diagram of the positioning block structure of the present invention;

[0036] Figure 5 This is a schematic diagram of the first side of the bend in the present invention.

[0037] Figure 6 This is a schematic diagram of the structure when processing the second side of the bend in this invention;

[0038] In the diagram: 1. Thin pipe section; 2. First bend pipe section; 3. Variable diameter section; 4. Second bend pipe section; 5. Thick pipe section; 6. Wheel mold; 60. First layer clamping groove; 61. Second layer clamping groove; 7. Clamping mold; 70. Lower layer clamping groove; 71. Upper layer clamping groove; 8. Positioning block; 80. First positioning opening; 81. Second positioning opening; 9. Guide mold; 90. First guide groove; 91. Second guide groove. Detailed Implementation

[0039] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0040] like Figure 2 - Figure 6 The illustrated pipe bending die includes a wheel mold 6, a clamping mold 7, and a guide mold 9, used for processing a first bend section 2 and a second bend section 4 on a reducing pipe having a thicker pipe section 5. Figure 1 As shown, the reducing pipe includes a thick pipe section 5 in the middle, and symmetrical second bend pipe section 4, reducing pipe section 3, first bend pipe section 2 and thin pipe section 1 on both sides of the thick pipe section 5; the mold is used to process the first bend pipe section 2 and the second bend pipe section 4 on both sides of the thick pipe section 5.

[0041] The wheel mold 6 has a first layer of clamping grooves 60 and a second layer of clamping grooves 61 distributed along its axial direction. Both the first layer of clamping grooves 60 and the second layer of clamping grooves 61 have a positioning part and an arc-shaped forming part. The clamping mold 7 is provided with a lower layer of clamping groove 70 and an upper layer of clamping groove 71. The clamping mold 7 can move towards or away from the wheel mold 6.

[0042] The first layer clamping groove 60 and the lower layer clamping groove 70 can form a first processing cavity for processing the second bent pipe section 4, and the second layer clamping groove 61 and the upper layer clamping groove 71 can form a second processing cavity for processing the first bent pipe section 2.

[0043] The guide mold 9 has a first guide groove 90 and a second guide groove 91. The guide mold 9 can move closer to or away from the wheel mold 6 so that the first guide groove 90 or the second guide groove 91 can press against the thin tube section 1 of the variable diameter tube near the clamping part.

[0044] A positioning block 8 is installed on the wheel mold 6. The positioning block 8 is used to position the variable diameter pipe. Specifically, the positioning block 8 is used to assist in positioning the variable diameter pipe in the first processing cavity. When processing the second bend section 4 at one end of the variable diameter pipe, the positioning block 8 is used to contact the coarse pipe section 5. When processing the second bend section 4 at the other end of the variable diameter pipe, the positioning block 8 is used to position the coarse pipe section 5 and the already processed second bend section 4.

[0045] Specifically, the positioning block 8 has a first positioning opening 80 for positioning the thicker section of the reducing pipe, and a second positioning opening 81 for positioning the second bent pipe section 4 formed on one side.

[0046] A pipe bending process, using the aforementioned mold, includes the following steps:

[0047] S1. The first end of the thin tube segment 1 on one side of the variable diameter tube is clamped. The clamping mold 7 and the guide mold 9 move towards the wheel mold, so that the variable diameter tube has a part located in the first processing cavity and the first guide groove 90. At this time, the first positioning opening 80 of the positioning block 8 contacts the thick tube segment 5 to achieve precise positioning of it.

[0048] S2, wheel mold 6 and clamping mold 7 rotate synchronously to process the second bend section 4 of the variable diameter pipe;

[0049] S3. Move the clamping mold 7, guide mold 9 and wheel mold 6 to separate them from the reducing tube, rotate the reducing tube, move the clamping mold 7, guide mold 9 and wheel mold 6, so that the reducing tube is located in the second processing cavity and the second guide groove 91.

[0050] S4, wheel mold 6 and clamping mold 7 rotate synchronously to process the first bend section 2 of the variable diameter pipe;

[0051] S5. Move the clamping mold 7, guide mold 9 and wheel mold 6 to separate the three from the reducer tube, remove the reducer tube, and reverse and clamp the second end of the other thin tube segment 1 of the reducer tube.

[0052] S6, the moving clamping mold 7, the guide mold 9 and the wheel mold 6, so that the variable diameter tube has a part located in the first processing cavity, and the positioning block 8 positions the variable diameter tube. At this time, the first positioning opening 80 of the positioning block 8 contacts the coarse tube section 5, and the second bend section 4 on the already processed side has a part located in the second positioning opening 81. When the second bend section 4 is processed, the positioning relative to the first bend section is completed to ensure processing accuracy.

[0053] S7, wheel mold 6 and clamping mold 7 rotate synchronously to process the second bend section 4 at the second end of the variable diameter pipe;

[0054] S8. Move the clamping mold 7, guide mold 9 and wheel mold 6 to separate them from the reducing tube. Rotate the reducing tube and move the clamping mold 7, guide mold 9 and wheel mold 6 so that the reducing tube is located in the second processing cavity and the second guide groove 91.

[0055] S9, wheel mold 6 and clamping mold 7 rotate synchronously to process the first bend section 2 at the second end of the reducing pipe.

[0056] Then, move the clamping mold 7, guide mold 9, and wheel mold 6 to detach them from the reducer and remove the reducer, thus achieving the desired result for the reducer.

[0057] This method involves initial positioning and machining of the second bend segment 4, adjusting the position and machining the first bend segment 2, removing the part, turning it around, and repositioning it. Using positioning block 8 as an aid, the second bend segment 4 at the other end is machined, and then the position is adjusted again to machine the first bend segment 2 at the other end. The resulting variable diameter bend fitting, after inspection, meets the process standards for bending angles and pipe diameter deformation in each section. Furthermore, machining of all four bends can be achieved using a single mold, and the machining of the symmetrical second bend segment 4 serves as a reference, further increasing machining accuracy.

[0058] The movable clamping mold 7, guide mold 9, and wheel mold 6 include the ability to move the clamping mold 7, guide mold 9, and wheel mold 6 in the vertical and horizontal directions to ensure that the variable diameter tube is located in or out of the first processing cavity, the first guide groove 90, the second processing cavity, and the second guide groove 91.

[0059] To further increase processing efficiency, clamping mold 7 and guide mold 9 move synchronously in the horizontal direction.

[0060] In step S6, the moving wheel mold 6 is moved so that the first layer clamping groove 60 contacts the variable diameter pipe, and at the same time the variable diameter pipe is manually adjusted so that the second bend section 4 and the thick section 5 processed in step S2 contact the positioning block 8.

[0061] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention 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 the present invention.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0063] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature.

[0065] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A pipe bending mold, comprising a wheel mold (6), a clamping mold (7), and a guide mold (9), characterized in that, Used for processing the first bend (2) and the second bend (4) on a reducing pipe with a thicker pipe section (5); The wheel mold (6) has a first layer of clamping grooves (60) and a second layer of clamping grooves (61) distributed along its axial direction. The clamping mold (7) has a lower layer of clamping grooves (70) and an upper layer of clamping grooves (71). The clamping mold (7) can move towards or away from the wheel mold (6). The first layer clamping groove (60) and the lower layer clamping groove (70) can form a first processing cavity for processing the second bent pipe section (4), and the second layer clamping groove (61) and the upper layer clamping groove (71) can form a second processing cavity for processing the first bent pipe section (2). The guide mold (9) has a first guide groove (90) and a second guide groove (91). The guide mold (9) can move towards or away from the wheel mold (6) so that the first guide groove (90) or the second guide groove (91) can press against the thin tube section (1) of the variable diameter tube near the clamping part. The wheel mold (6) is equipped with a positioning block (8), which is used to position the variable diameter pipe.

2. The pipe bending mold according to claim 1, characterized in that, The positioning block (8) has a first positioning opening (80) for positioning with the thicker section of the reducing pipe.

3. The pipe bending mold according to any one of claims 1-2, characterized in that, The positioning block (8) has a second positioning opening (81) for positioning the second bent pipe section (4) formed on one side.

4. The pipe bending mold according to claim 1, characterized in that, The positioning block (8) is used to assist in positioning the variable diameter tube in the first processing cavity.

5. A method for processing pipe bending, characterized in that, The application of the mold as described in any one of claims 1-4 includes the following steps: S1. The first end of the variable diameter tube is clamped, and the clamping mold (7) and the guide mold (9) move toward the wheel mold so that the variable diameter tube has a portion located in the first processing cavity and the first guide groove (90); S2, the wheel mold (6) and the clamping mold (7) rotate synchronously to realize the processing of the second bend section (4) of the variable diameter pipe; S3. Move the clamping mold (7), guide mold (9) and wheel mold (6) to separate them from the reducing tube. Rotate the reducing tube and move the clamping mold (7), guide mold (9) and wheel mold (6) so that the reducing tube is located in the second processing cavity and the second guide groove (91). S4, the wheel mold (6) and the clamping mold (7) rotate synchronously to process the first bend section (2) of the variable diameter pipe; S5. Move the clamping mold (7), guide mold (9) and wheel mold (6) to separate the three from the reducer tube, remove the reducer tube, and reverse and clamp the second end of the reducer tube; S6, moving the clamping mold (7), guide mold (9) and wheel mold (6) so that the variable diameter tube has a part located in the first processing cavity, and the positioning block (8) positions the variable diameter tube; S7, the wheel mold (6) and the clamping mold (7) rotate synchronously to realize the processing of the second bend section (4) at the second end of the variable diameter pipe; S8. Move the clamping mold (7), guide mold (9) and wheel mold (6) to separate them from the reducing tube. Rotate the reducing tube and move the clamping mold (7), guide mold (9) and wheel mold (6) so that the reducing tube is located in the second processing cavity and the second guide groove (91). S9, the wheel mold (6) and the clamping mold (7) rotate synchronously to process the first bend section (2) of the second end of the variable diameter pipe.

6. The pipe bending method according to claim 5, characterized in that, In step S1, the thicker section (5) of the reducing pipe comes into contact with the positioning block (8).

7. The pipe bending method according to claim 5, characterized in that, The movable clamping mold (7), guide mold (9) and wheel mold (6) include the movable clamping mold (7), guide mold (9) and wheel mold (6) in the vertical and horizontal directions.

8. The pipe bending method according to claim 7, characterized in that, The clamping mold (7) and the guide mold (9) move synchronously in the horizontal direction.

9. The pipe bending method according to claim 5, characterized in that, In step S6, the moving wheel mold (6) makes the first layer clamping groove (60) contact the variable diameter pipe, and at the same time, the variable diameter pipe is manually adjusted so that the second bend pipe section (4) and the thick pipe section (5) processed in step S2 contact the positioning block (8).

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