Pipe expanding device

Abstract

The utility model discloses a pipe expanding device which comprises a machine frame, and a positioning and pressing mechanism and a punching mechanism are arranged on the machine frame. The device is characterized in that the positioning and pressing mechanism comprises a lower die, an upper die and a vertical pressing cylinder, and a lower groove is formed in the upper surface of the lower die; an upper groove is formed in the lower surface of the upper die; the upper groove and the lower groove correspond to each other up and down; the lower die and the rack are relatively fixed; the output end of the vertical pressing cylinder is connected with the upper die; the lower groove comprises a front transverse pipe section lower part positioning and clamping groove and a middle longitudinal pipe section lower part positioning and clamping groove; the upper groove comprises a front transverse pipe section upper part positioning and clamping groove and a middle longitudinal pipe section upper part positioning and clamping groove; the punching mechanism comprises a punch and a horizontal pressing cylinder, and the output end of the horizontal pressing cylinder is connected with the punch. The pipe expanding device can be used for automatically positioning, pressing and expanding the front end of the bent pipe during pipe expanding processing, can prevent a workpiece from moving or rotating, can improve production efficiency, saves time and labor, and ensures processing precision.

Description

Technical Field

[0001] The utility model relates to a tube expansion device. Background Art

[0002] The automobile air conditioning piping system is also a core component of the automobile. With the development of the market, due to the increasing requirements for automobile space utilization, the connection degree of air conditioning pipes has become more and more stringent, and various types have emerged. Figure 1 , and for an existing elbow joint, the elbow joint includes a front transverse pipe section N-1, a middle longitudinal pipe section N-2 and a rear transverse pipe section N-3, and its overall appearance is Z-shaped. In the production process, there is a process that requires processing a front interface N-11 with a larger inner diameter at the end of the front transverse pipe section N-1, which is called the expansion process.

[0003] The elbow joint has a special-shaped structure, and the original fixture uses two V-shaped blocks for symmetrical clamping (refer to CN204354005U, CN209424581U, etc.). Since the expansion process is an axial impact, the workpiece will easily become loose in the axial direction and in the direction of rotation after being subjected to force, and the clamping point will slip, which will seriously affect the molding quality and dimensional accuracy, and cause surface scratches. Utility Model Content

[0004] The utility model provides a tube expansion device to solve the problem that the existing elbow joint will loosen in the axial direction and in the rotation direction during tube expansion processing and the clamping part will slip.

[0005] In order to achieve the above-mentioned purpose, the technical scheme of the utility model is a tube expansion device, including a frame, on which a positioning and clamping mechanism and a punching mechanism are arranged; characterized in that: the positioning and clamping mechanism includes a lower die, an upper die and a vertical pressure cylinder, the upper surface of the lower die is provided with a lower groove; the lower surface of the upper die is provided with an upper groove; the upper groove and the lower groove correspond to each other up and down; the lower die is relatively fixed to the frame; the output end of the vertical pressure cylinder is connected to the upper die; the lower groove includes a positioning and clamping groove at the lower part of the front transverse tube section and a positioning and clamping groove at the lower part of the middle longitudinal tube section; the upper groove includes a positioning and clamping groove at the upper part of the front transverse tube section and a positioning and clamping groove at the upper part of the middle longitudinal tube section;

[0006] The punching mechanism comprises a punch and a horizontal pressure cylinder, and the output end of the horizontal pressure cylinder is connected to the punch.

[0007] Furthermore, the output end of the horizontal pressure cylinder is fixedly connected to the slide seat; a punch is fixedly installed on the slide seat;

[0008] A horizontal guide rail is fixedly arranged on the frame; the slide seat is slidably matched with the horizontal guide rail; and the horizontal pressure cylinder is fixedly installed on the frame.

[0009] Furthermore, there are two horizontal guide rails which are spaced apart and arranged in parallel.

[0010] Furthermore, the lower mold is fixedly mounted on the frame; a vertical guide column is fixedly arranged on the lower mold;

[0011] The upper die is slidably matched with the vertical guide column; and the vertical pressure cylinder is fixedly mounted on the frame.

[0012] Furthermore, there are two vertical guide columns which are spaced apart and distributed in parallel.

[0013] Furthermore, a rear transverse pipe section support platform is also provided on the lower mold.

[0014] Beneficial effects of the utility model:

[0015] First, the utility model adopts horizontal tube expansion processing, which can realize automatic positioning and pressing of the workpiece, as well as automatic tube expansion processing, which is simple to operate, saves time and effort, can reduce labor intensity, improve production products, and also ensure the processing quality of the workpiece;

[0016] Second, when the workpiece of the utility model is subjected to axial impact during tube expansion processing, the workpiece will not loosen in the axial direction or in the rotation direction after being subjected to force, and the clamping part will not loosen and slip, thereby ensuring the molding quality and dimensional accuracy, and the surface will not be scratched;

[0017] Third, during stamping, the horizontal pressure cylinder drives the slide to move along the horizontal guide rail, and the punch moves linearly during stamping and resetting, thereby ensuring processing accuracy;

[0018] Fourthly, in the utility model, since the vertical pressure cylinder drives the upper die to move up and down along the vertical guide column, the upper die moves linearly, so that the workpiece is symmetrically positioned and clamped by the upper groove and the lower groove, thereby improving the positioning accuracy of the workpiece and fully clamping it in place, while avoiding misalignment, crushing the workpiece and preventing loosening;

[0019] Fifth, the utility model further provides a rear transverse tube section support platform on the lower die, and the rear transverse tube section support platform horizontally supports the rear transverse tube section of the workpiece, which is beneficial to prevent the workpiece from rotating and loosening, and at the same time, the vibration and displacement of the rear transverse tube section of the workpiece can be easily observed during stamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a comparison diagram of an existing elbow joint before and after expansion processing.

[0021] Figure 2-4 It is a structural schematic diagram of a tube expansion device in the utility model.

[0022] Figure 5-6 The utility model is a schematic structural diagram of a tube expansion device when a workpiece is placed.

[0023] Figure 7 yes Figure 5 Enlarged view of point A in the middle.

[0024] Figure 8-10 The utility model is a structural schematic diagram of a tube expansion device when a workpiece is positioned, pressed and expanded into place. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0026] Example 1: See Figure 2-4 A tube expansion device comprises a frame 1, on which a positioning and clamping mechanism 2 and a punching mechanism 3 are arranged; the positioning and clamping mechanism 2 comprises a lower die 2-1, an upper die 2-2 and a vertical pressure cylinder 2-3, the upper surface of the lower die 2-1 is provided with a lower groove 2-11; the lower surface of the upper die 2-2 is provided with an upper groove 2-21; the upper groove 2-21 corresponds to the lower groove 2-11 up and down; the lower die 2-1 is relatively fixed to the frame 1; the output end of the vertical pressure cylinder 2-3 is connected to the upper die 2-2; the lower groove 2-11 comprises a lower positioning and clamping groove 2-111 of the front transverse tube section and a lower positioning and clamping groove 2-112 of the middle longitudinal tube section; the upper groove 2-21 comprises an upper positioning and clamping groove 2-211 of the front transverse tube section and an upper positioning and clamping groove 2-212 of the middle longitudinal tube section;

[0027] The punching mechanism 3 includes a punch 3-1 and a horizontal pressing cylinder 3-2, and the output end of the horizontal pressing cylinder 3-2 is connected to the punch 3-1.

[0028] When this embodiment is used, the workpiece (i.e., the elbow joint) is first positioned and pressed, and then the tube expansion process is performed.

[0029] When positioning and pressing, first position the workpiece into the lower groove 2-11 (visible Figure 5-7 ), so that the front transverse tube section N-1 of the workpiece is located in the lower positioning and clamping groove 2-111 of the front transverse tube section, wherein the longitudinal tube section N-2 is located in the lower positioning and clamping groove 2-111 of the front transverse tube section, and then the vertical pressure cylinder 2-3 is started to work, and the vertical pressure cylinder 2-3 drives the upper mold 2-2 to move downward into position and maintain the pressure state (the upper mold 2-2 and the lower mold 2-1 are combined to position and clamp the workpiece); at this time, the upper positioning and clamping groove 2-211 of the front transverse tube section and the lower positioning and clamping groove 2-111 of the front transverse tube section are combined to position and clamp the front transverse tube section N-1 of the workpiece, and the upper positioning and clamping groove 2-212 of the middle longitudinal tube section and the lower positioning and clamping groove 2-112 of the middle longitudinal tube section are combined to position and clamp the middle longitudinal tube section N-2 of the workpiece (it can be seen that Figure 8-10 ). Then the tube expansion process can be carried out.

[0030] During the tube expansion process, the horizontal pressure cylinder 3-2 is started to work, and the horizontal pressure cylinder 3-2 drives the punch 3-1 to punch toward the front transverse tube section N-1 port. The front transverse tube section N-1 port expands and deforms under the action of the punch 3-1 to obtain a front interface N-11 with an enlarged inner diameter (see Figure 8-10 ).

[0031] Since the front transverse tube section N-1 and the middle longitudinal tube section N-2 of the workpiece are combined, positioned and clamped during the tube expansion process, the front transverse tube section N-1 and the middle longitudinal tube section N-2 are L-shaped; when the front transverse tube section N-1 of the workpiece is subjected to axial force at its end (i.e., when the punch 3-1 is punching), the longitudinal tube section N-2 cannot move along the axial direction of the front transverse tube section N-1 in the upper positioning and clamping groove 2-212 of the middle longitudinal tube section and the lower positioning and clamping groove 2-112 of the middle longitudinal tube section, thereby generating a blocking effect and preventing the front transverse tube section N-1 from axially loosening;

[0032] When the workpiece's front transverse tube section N-1 port is subjected to axial force (i.e. when the punch 3-1 is punching), the longitudinal tube section N-2 is clamped in the upper positioning clamping groove 2-212 and the lower positioning clamping groove 2-112 of the middle longitudinal tube section and is constrained by the lower die 2-1 and the upper die 2-2 and cannot swing up and down, thereby producing an anti-rotation effect and preventing the front transverse tube section N-1 from rotating and loosening.

[0033] Therefore, in this embodiment, when the workpiece is subjected to axial impact during the tube expansion process, the workpiece will not loosen in the axial direction or in the rotation direction after being subjected to the force, and the clamping part will loosen and slip, thereby ensuring the molding quality and dimensional accuracy, and the surface will not be scratched. At the same time, this embodiment adopts horizontal tube expansion processing (different from conventional vertical processing), which can realize automatic positioning and clamping of the workpiece, as well as automatic tube expansion processing, which is simple to operate, saves time and effort, can reduce labor intensity, improve production products, and also ensure the processing quality of the workpiece.

[0034] See also Figure 2-4 , further, the output end of the horizontal pressure cylinder 3-2 is fixedly connected to the slide 3-3; the punch 3-1 is fixedly installed on the slide 3-3; the horizontal guide rail 3-4 is fixedly arranged on the frame 1; the slide 3-3 and the horizontal guide rail 3-4 are slidably matched; the horizontal pressure cylinder 3-2 is fixedly installed on the frame 1. Further, the horizontal guide rail 3-4 has two and is distributed in parallel and spaced apart.

[0035] In this way, during operation, the horizontal pressure cylinder 3-2 drives the slide 3-3 to move along the horizontal guide rail 3-4, and the punch 3-1 moves linearly during punching and resetting, thereby ensuring processing accuracy.

[0036] See also Figure 2-4, further, the lower mold 2-1 is fixedly mounted on the frame 1; the lower mold 2-1 is fixedly provided with a vertical guide column 2-4; the upper mold 2-2 is slidably matched with the vertical guide column 2-4; the vertical pressure cylinder 2-3 is fixedly mounted on the frame 1. Further, the vertical guide column 2-4 has two and is parallel and spaced apart.

[0037] In this way, when working, the vertical pressure cylinder 2-3 drives the upper mold 2-2 to move up and down along the vertical guide column 2-4, and the upper mold 2-2 moves linearly, so that the workpiece is symmetrically positioned and clamped by the upper groove 2-21 and the lower groove 2-11, thereby improving the positioning accuracy of the workpiece and fully clamping it in place, while avoiding misalignment and crushing the workpiece and preventing loosening.

[0038] Preferably, the horizontal pressure cylinder 3-2 and the vertical pressure cylinder 2-3 are telescopic cylinders driven by hydraulic medium.

[0039] Embodiment 2: This embodiment is based on Embodiment 1: Figure 8-10 Furthermore, a rear transverse pipe section support platform 2-12 is provided on the lower die 2-1. The rear transverse pipe section support platform 2-12 horizontally supports the rear transverse pipe section N-3 of the workpiece, which is beneficial to prevent the workpiece from rotating and loosening, and at the same time, the vibration and displacement of the rear transverse pipe section N-3 of the workpiece can be easily observed during stamping.

[0040] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A tube expansion device, comprising a frame (1), on which a positioning and pressing mechanism (2) and a punching mechanism (3) are arranged; characterized in that: The positioning and clamping mechanism (2) comprises a lower die (2-1), an upper die (2-2) and a vertical pressure cylinder (2-3); the upper surface of the lower die (2-1) is provided with a lower groove (2-11); the lower surface of the upper die (2-2) is provided with an upper groove (2-21); the upper groove (2-21) and the lower groove (2-11) correspond to each other in upper and lower directions; the lower die (2-1) is relatively fixed to the frame (1); the output end of the vertical pressure cylinder (2-3) is connected to the upper die (2-2); The lower groove (2-11) includes a positioning and clamping groove (2-111) at the lower part of the front transverse pipe section and a positioning and clamping groove (2-112) at the lower part of the middle longitudinal pipe section; the upper groove (2-21) includes a positioning and clamping groove (2-211) at the upper part of the front transverse pipe section and a positioning and clamping groove (2-212) at the upper part of the middle longitudinal pipe section; The punching mechanism (3) comprises a punch (3-1) and a horizontal pressing cylinder (3-2), and the output end of the horizontal pressing cylinder (3-2) is connected to the punch (3-1).

2. A tube expansion device according to claim 1, characterized in that: The output end of the horizontal pressure cylinder (3-2) is fixedly connected to the slide seat (3-3); a punch (3-1) is fixedly mounted on the slide seat (3-3); A horizontal guide rail (3-4) is fixedly arranged on the frame (1); the slide seat (3-3) is slidably matched with the horizontal guide rail (3-4); and the horizontal pressure cylinder (3-2) is fixedly mounted on the frame (1).

3. A tube expansion device according to claim 2, characterized in that: The horizontal guide rails (3-4) are provided in two pieces and are distributed in parallel and at intervals.

4. A tube expansion device according to any one of claims 1 to 3, characterized in that: The lower mold (2-1) is fixedly mounted on the frame (1); a vertical guide column (2-4) is fixedly arranged on the lower mold (2-1); The upper die (2-2) is slidably matched with the vertical guide column (2-4); and the vertical pressure cylinder (2-3) is fixedly mounted on the frame (1).

5. A tube expansion device according to claim 4, characterized in that: The vertical guide columns (2-4) are provided in two and are distributed in parallel and at intervals.

6. A tube expansion device according to claim 1, characterized in that: The lower die (2-1) is also provided with a rear transverse pipe section support platform (2-12).

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