Accurate positioning device for symmetrical welding points of copper pipe

Abstract

The utility model discloses a copper pipe symmetrical welding point accurate positioning device which comprises an inner die and an outer die, the outer die comprises two half female dies, the two half female dies move relatively and are close to each other and spliced, inner groove faces of the two half female dies are spliced to form a ring face, the ring face is attached to the outer wall face of a pipe fitting, and the inner groove faces of the two half female dies are connected with the inner die. Forming concave holes are formed in the inner groove surfaces of the half concave dies, and the two forming concave holes are symmetrical relative to the pipe fitting; the inner die comprises two half male dies, the two half male dies are pushed by a driving structure to be relatively far away from each other, the two half male dies correspond to the two half female dies respectively, forming protrusions are arranged on the outer circle faces of the half male dies, and the forming protrusions are aligned to the corresponding forming concave holes in the moving direction of the forming protrusions. When the forming protrusions are matched with the corresponding forming concave holes in an inserted mode, the outer circle faces of the half male dies are attached to the inner wall face of the pipe fitting. The two welding points which are absolutely symmetrical on the copper pipe are machined and formed at a time, and the precision and the efficiency are high.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe fitting welding point processing, in particular to a precise positioning device for symmetrical welding points of copper pipes. Background Art

[0002] Welding bumps are often used to improve welding efficiency and quality. They require pre-processing on pipe fittings. To form bumps on the wall of a copper pipe, a punch is often used to push a steel ball against the inner wall of the pipe, creating the bumps. However, using this method to create a symmetrical bump structure on the pipe wall requires forming two bumps in sequence. Before processing the second bump, the copper pipe must be rotated and clamped again to ensure symmetry between the two processed bumps. Repeated debugging and measurement are required to ensure absolute symmetrical processing accuracy. Therefore, using common pipe bump forming equipment to create symmetrical bumps is difficult, resulting in poor precision and low efficiency. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the utility model provides a precise positioning device for symmetrical welding points on copper tubes, which can realize one-time processing and forming of two absolutely symmetrical welding points on the copper tube with high precision and efficiency.

[0004] Technical solution: To achieve the above purpose, the utility model provides a device for accurately positioning symmetrical welding points of a copper tube, comprising an inner mold and an outer mold, wherein the outer side of the inner mold is sleeved with a tube fitting, and the outer side of the tube fitting is sleeved with the outer mold;

[0005] The outer mold includes two half-die molds, the two half-die molds are relatively moved close to each other and spliced, the inner groove surfaces of the two half-die molds are spliced ​​to form an annular surface, the annular surface is attached to the outer wall surface of the pipe fitting, and the inner groove surface of the half-die mold is provided with a forming concave hole, and the two forming concave holes are symmetrical with respect to the pipe fitting;

[0006] The inner mold includes two half-punches, which are pushed away from each other by a driving structure. The two half-punches correspond to the two half-concave molds respectively. A forming protrusion is provided on the outer circular surface of the half-punch, and the forming protrusion is aligned with the corresponding forming concave hole along its own moving direction. When the forming protrusion is inserted into the corresponding forming concave hole, the outer circular surface of the half-punch fits with the inner wall surface of the pipe fitting.

[0007] Furthermore, the driving structure includes a punch block, the two half punches are respectively attached to the two driving surfaces of the punch block, the punch block is movably arranged along the axis of the pipe fitting, and the half punches are movably arranged in a direction perpendicular to the axis of the pipe fitting.

[0008] Furthermore, the two half-punches are both slidably arranged in the guide groove, and the half-punches are elastically connected to the groove end faces of the guide groove via a reset member.

[0009] Furthermore, when the two half-convex molds are fitted together, the ends of the two forming protrusions can just contact the inner wall surface of the pipe at the same time.

[0010] Furthermore, a limiting piece is provided at the root of the semi-convex mold, and the limiting piece is fitted with the end face of the pipe fitting.

[0011] Furthermore, the limiting member is movably arranged along the axis of the pipe.

[0012] Beneficial effects: The utility model provides a precise positioning device for symmetrical welding points of copper tubes, which realizes the centering of the tube fittings through the inner support of the inner mold and the clamping cooperation of the outer mold, and realizes the axial forming position positioning of the convex points through axial limitation; the driving structure drives the two half-punches to move synchronously to realize the synchronous forming of the two convex points, and realizes the one-time processing and forming of two absolutely symmetrical welding points on the copper tube, with high precision and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the three-dimensional structure of an embodiment of the utility model;

[0014] Figure 2 This is a schematic structural perspective view of the inner mold and outer mold of an embodiment of the present utility model. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings.

[0016] As attached Figure 1-2 The device for accurately positioning symmetrical welding points of a copper tube comprises an inner mold and an outer mold, wherein the outer side of the inner mold is sleeved with a tube 1, and the outer mold is sleeved with the outer side of the tube 1. During processing, the tube is sleeved between the inner and outer molds.

[0017] The outer mold includes two half-die 2, which are relatively moved and close to each other for splicing. The inner groove surfaces of the two half-die 2 are spliced ​​to form an annular surface, which fits on the outer wall of the pipe 1. The inner groove surface of the half-die 2 is provided with a forming concave hole 3, and the two forming concave holes 3 are symmetrical with respect to the pipe 1; the position of the pipe is fixed by clamping the two half-die so that the position of the two forming concave holes 3 is fixed relative to the pipe, so as to ensure that the processed convex points are symmetrical with respect to the pipe.

[0018] The inner mold includes two half-punches 4, which are pushed away from each other by a driving structure. The two half-punches 4 correspond to the two half-die 2, respectively. The outer circumferential surfaces of the half-punches 4 are provided with forming protrusions 6, which align with the corresponding forming recesses 3 along their own moving direction. When the forming protrusions 6 are inserted and matched with the corresponding forming recesses 3, the outer circumferential surfaces of the half-punches 4 fit the inner wall surface of the pipe 1. Through the radial impact of the two half-punches, the forming protrusions 6 and the forming recesses 3 are pressed together to form a convex point structure. After complete pressing, the inner arc groove surface of the half-die 2 and the outer circumferential surface of the half-punch 4 clamp the pipe wall, thereby shaping the pipe wall after stamping, ensuring the shape and size quality of the processed pipe.

[0019] The driving structure includes a punch 5, and the two half-punches 4 are respectively attached to the two driving surfaces of the punch 5. The punch 5 is arranged to move along the axis of the pipe 1, and the half-punches 4 are arranged to move in a direction perpendicular to the axis of the pipe 1. Through the sliding cooperation between the punch and the half-punches, the axial impact of the punch is converted into a radial impact of the half-punches, and the two half-punches can be driven to move simultaneously, thereby achieving the simultaneous formation of two convex points, eliminating the need for two consecutive forming steps and the step of adjusting the pipe and re-clamping in the middle. The two simultaneously formed convex points can maintain absolute symmetry.

[0020] The two half-punches 4 are both slidably disposed within the guide groove 41, and the half-punches 4 are elastically connected to the groove end faces of the guide groove 41 via reset members. The elastic reset members allow the two half-punches 4 to fit together in the initial state, and form a cavity between the two half-punches that fits the punch block. The punch block is a strip-shaped block with a pointed cone at the front end. It impacts along its own length and includes two symmetrical inclined driving surfaces at the front end. When the punch block performs an impact motion, the driving surfaces at the front end slide relative to the mating surfaces on the half-punches, thereby synchronously pushing the two half-punches apart until the two half-punches fit together with the two parallel side faces of the punch block, thereby achieving the formation of the convex point.

[0021] During the process, the elastic reset parts on both sides play a certain buffering role. After the stamping is completed, as the punch block is recovered, the half punches on both sides are restored to their initial state under the action of the elastic reset parts, so that the forming protrusions 6 are separated from the forming convex points. Then the half concave molds on both sides are moved to both sides away from the pipe fittings, and the processed pipe fittings can be removed from the inner mold.

[0022] When the two half-punches 4 are fitted together, the ends of the two forming protrusions 6 can just contact the inner wall of the pipe 1 at the same time. Because the two half-punches are radially constrained by the punch block, the inner mold is relatively centered. Therefore, the inner mold in the initial state supports the inner wall of the pipe, and the clamping of the two half-die achieves the central positioning of the pipe during loading, avoiding eccentric clamping of the pipe and the resulting processing errors.

[0023] And because the copper tube has good ductility, when stamping, the forming protrusion 6 directly contacts the inner wall of the copper tube and realizes the forming of the bulge by rapid pressing rather than rapid frontal impact, which can make the formed surface quality better and the transition between the bulge surface and the tube wall surface smoother and rounder.

[0024] A limiter is provided at the base of the semi-punch 4, which mates with the end face of the pipe 1. Based on the aforementioned centering and positioning of the pipe, the limiter mates with the end face of the pipe, thereby achieving axial constraint on the pipe and positioning the protrusion in the axial forming position of the pipe. The limiter is arranged by moving it along the axis of the pipe 1. Adjustments can be made based on the different axial processing positions of the protrusion. During installation, it is sufficient to ensure that the pipe cross-section mates with the limiter.

[0025] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A device for accurately positioning symmetrical welding points of copper tubes, characterized by: It comprises an inner mold and an outer mold, wherein the outer side of the inner mold is provided with a pipe (1), and the outer side of the pipe (1) is provided with the outer mold; The outer mold comprises two half-die molds (2), the two half-die molds (2) are relatively moved and close to each other, the inner groove surfaces of the two half-die molds (2) are spliced ​​together to form an annular surface, the annular surface is attached to the outer wall surface of the pipe (1), the inner groove surface of the half-die mold (2) is provided with a forming concave hole (3), and the two forming concave holes (3) are symmetrical with respect to the pipe (1); The inner mold includes two half-convex molds (4), and the two half-convex molds (4) are pushed away from each other by a driving structure. The two half-convex molds (4) correspond to the two half-concave molds (2) respectively. A forming protrusion (6) is provided on the outer circular surface of the half-convex mold (4). The forming protrusion (6) is aligned with the corresponding forming concave hole (3) along its own moving direction. When the forming protrusion (6) is inserted into the corresponding forming concave hole (3), the outer circular surface of the half-convex mold (4) fits the inner wall surface of the pipe (1).

2. The device for accurately positioning symmetrical welding points of a copper tube according to claim 1, characterized in that: The driving structure includes a punch (5), and the two half-punches (4) are respectively attached to the two driving surfaces of the punch (5). The punch (5) is arranged to move along the axis of the pipe (1), and the half-punches (4) are arranged to move in a direction perpendicular to the axis of the pipe (1).

3. The device for accurately positioning symmetrical welding points of a copper tube according to claim 2, characterized in that: The two semi-punches (4) are both slidably arranged in the guide groove (41), and the semi-punches (4) are elastically connected to the groove end surface of the guide groove (41) through a reset member.

4. The device for accurately positioning symmetrical welding points of a copper tube according to claim 3, characterized in that: When the two half-convex molds (4) are fitted together, the ends of the two forming protrusions (6) can just contact the inner wall surface of the pipe (1) at the same time.

5. The device for accurately positioning symmetrical welding points of a copper tube according to claim 4, characterized in that: A limiting piece is provided at the root of the semi-convex die (4), and the limiting piece is fitted with the end face of the pipe (1).

6. The device for accurately positioning symmetrical welding points of a copper tube according to claim 5, characterized in that: The limiting member is arranged to move along the axis of the pipe (1).

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