A pipe expanding die and a pipe forming apparatus

Abstract

The present application belongs to the field of pipeline processing, and particularly relates to a pipe fitting flaring punch die, which comprises a die front section, a flaring section and an insertion section are arranged on the die front section, a locking section is arranged between the flaring section and the insertion section, the size of the flaring section is larger than the internal size of the pipeline, the size of the locking section is smaller than the internal size of the pipeline, and the pipeline is sequentially guided through the insertion section, the locking section and the flaring section, and the flaring operation is performed on the pipeline by the flaring section. The flaring die of the present application effectively improves the pipeline consistency and positioning accuracy when the flared pipeline is connected with the normal pipeline.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of pipe processing, in particular, relates to a pipe fitting flaring punch die and pipe forming equipment. BACKGROUND

[0002] At present, the flared pipe fitting produced by the flaring die in the pipe workshop directly connects a large angle transition part between the flared section and the unflared section. Thus, the copper pipe matched therewith is prone to loosening or copper pipe ejection under external force, which affects the pipe consistency, positioning accuracy and subsequent process operation. Such phenomenon not only reduces the production efficiency, but also easily causes appearance defects and quality problems of the product.

[0003] In view of this, the present application is proposed. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a punch die for flaring pipe, which can improve the pipe consistency and positioning accuracy of the flared pipe and normal pipe.

[0005] To solve the above technical problem, the present application provides a punch die for pipe flaring, which comprises a die front section, wherein a flaring part and an insertion part are arranged on the die front section, a locking part is arranged between the flaring part and the insertion part, the size of the flaring part is larger than the internal size of the pipe, and the size of the locking part is smaller than the internal size of the pipe to be flared. During the pipe flaring process, the pipe to be flared passes through the insertion part, the locking part and the flaring part in sequence, and the flaring operation is performed on the pipe to be flared by the flaring part.

[0006] Further preferably, the die front section is a first cylinder, the flaring part is a flaring straight section located on the first cylinder, the insertion part comprises a tapered head arranged at the end of the first cylinder, the tapered head is formed by extending from the edge of the end of the first cylinder to the middle part, the locking part is a concave ring located between the flaring straight section and the tapered head, the cross-sectional diameter of the flaring straight section is larger than the inner diameter of the pipe, and the cross-sectional diameter of the concave ring is smaller than the inner diameter of the pipe.

[0007] Further preferably, the flaring straight section and the concave ring further have a transition part, the transition part is a tapered surface formed by extending from the edge of one end of the flaring straight section close to the concave ring to the concave ring.

[0008] Further preferably, the flaring straight section, the concave ring and the tapered surface are integrally formed.

[0009] Further preferably, the punch die further comprises a middle die section connected to the front die section, the middle die section is provided with an oil inlet hole, the tapered head is provided with an oil nozzle on the tapered surface, and the front die section and the middle die section are provided with an oil channel connecting the oil inlet hole and the oil nozzle.

[0010] Further preferably, the middle die section is a second cylinder, the diameter of the second cylinder is greater than the diameter of the first cylinder, the oil inlet hole is located on the side wall of the second cylinder, and the oil groove extends inside the first cylinder and the second cylinder to communicate the oil inlet hole and the oil nozzle.

[0011] Further preferably, the tapered head is provided with a plurality of oil nozzles, the plurality of oil nozzles are arranged around the tapered surface of the tapered head, and the oil channel is in communication with the plurality of oil nozzles respectively.

[0012] Further preferably, the punch die is arranged on a pipe forming device, the punch die comprises a rear die section, the middle die section is located between the front die section and the rear die section, the rear die section is provided with a positioning groove, and the punch die is installed on the pipe forming device through the positioning groove.

[0013] Further preferably, at least the front die section is coated with a DLC metal coating.

[0014] The application further provides a pipe forming device of a punch die.

[0015] Compared with the prior art, the application has the following beneficial effects:

[0016] (1) The flaring punch die of the application realizes one-step pipe fitting and solves the problem of pipe springback.

[0017] (2) The flaring punch die of the application avoids the situation that excess solder flows into the copper pipe to cause welding blockage.

[0018] (3) The flaring punch die of the application ensures the pipe fitting depth and effectively solves the problem of insufficient weld penetration.

[0019] (4) The flaring section locking structure of the flaring punch die of the application ensures the accuracy of pipe fitting and the consistency of the position and angle of the pipe fitting.

[0020] (5) The flaring punch die of the application effectively improves the work efficiency of pipe fitting operation.

[0021] (6) The lubrication of the die top end of the flaring punch die of the application reduces the abnormal rate of copper pipe cracking and flattening during flaring.

[0022] (7) The flared punch die of the present invention improves the self-lubricating and wear-resistant properties of the die, thereby increasing the service life of the die.

[0023] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0024] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0025] Figure 1 This is a schematic diagram of the structure of the mold punch according to an embodiment of the present invention.

[0026] Figure 2 for Figure 1 A cross-sectional view of the die punch.

[0027] Figure 3 for Figure 1 Side view from direction A.

[0028] Figure 4 This is a diagram showing the piping effect after the die punch is flared using an embodiment of the present invention.

[0029] Among them, 1. front section of mold; 11. flared section; 12. locking section; 13. transition section; 14. insertion section; 141. oil nozzle; 15. positioning section; 2. middle section of mold; 21. oil inlet hole; 3. rear section of mold; 31. positioning groove; 4. oil channel.

[0030] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] In the description of this invention, it should be noted that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this 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 limiting this invention.

[0033] In the description of the present application, it should be noted that unless specifically defined and limited, the terms "mounting", "connecting", "connecting", "contacting", "communication" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] As shown in Figures 1-3 A punch die for pipe flaring, the punch die comprises a die front section 1, the die front section 1 is provided with a flaring part 11 and an insertion part 14, a locking part 12 is arranged between the flaring part 11 and the insertion part 14, the size of the flaring part 11 is larger than the internal size of the pipe, the size of the locking part 12 is smaller than the internal size of the pipe, and during the pipe flaring process, the pipe passes through the insertion part 14, the locking part 12 and the flaring part 11 in sequence, and the flaring operation is performed on the pipe by the flaring part 11. The punch die of the embodiment is suitable for flaring operation of pipes made of different materials, such as copper pipes and PVC pipes, and can also be used for flaring operation of pipe fittings of other specifications and for other purposes. In this embodiment, a locking part 12 is formed on the flared pipe by adding a locking part 12 at one end, and the normal pipe is locked by the locking part 12 after being inserted into the flared pipe, thereby ensuring the consistency and positioning accuracy of the flared pipe and the normal pipe.

[0035] In actual operation, the punch die of the embodiment is installed on an automatic (semi-automatic) pipe forming equipment, and the pipe fitting flaring operation is performed according to the production process. During the flaring process, the locking part 12 of the die front section reshapes the pipe fitting, and the produced pipe fitting flaring part will have the locking part 12. During pipe fitting, inserting the pipe into the flared locking part 12 will position and lock the two pipe fittings that cooperate with each other, achieving the purpose of preventing pipe fitting from rebounding, improving the consistency and positioning accuracy of pipe fitting.

[0036] Further preferably, the die front section 1 is a first cylindrical body, the flaring part 11 is a flaring straight section located on the first cylindrical body, which is better adapted to the internal shape of the pipe, the insertion part 14 is a tapered head formed by extending the edge of the end of the first cylindrical body to the middle, and the locking part 12 is a concave ring located between the flaring straight section and the tapered head. The cross-sectional diameter of the flaring straight section is greater than the internal diameter of the pipe, and the cross-sectional diameter of the concave ring is less than the internal diameter of the pipe.

[0037] The pipe fitting after being flared by the punch die of the embodiment is matched with a normal pipe fitting, the normal pipe fitting, i.e. the inner pipe, is inserted into the flared pipe fitting, i.e. the outer pipe, and the inner pipe inserted is tightly clamped by the concave ring locking portion 12 at the bottom end of the flared pipe fitting, and there is no gap between the two (as shown in Figure 4 Thus, in the subsequent welding process, the solder melted during welding cannot flow into the pipe, and the welding blockage is avoided. Since no excess solder flows into the pipe, the solder is entirely left in the pipe gap, thereby ensuring the penetration depth. Further, Figure 4 The outer pipe further has a positioning portion 15 formed by another process, i.e. a necking process, i.e. the diameter of a section of the pipe is reduced to form a positioning ring, the inner diameter of the positioning portion 15 is smaller than the outer diameter of the inner pipe, the inner pipe is inserted into the outer pipe and stopped when reaching the positioning portion 15, and the positioning portion 15 functions to ensure the pipe depth (i.e. the weld depth, which directly affects the welding quality of the pipe fitting).

[0038] Further preferably, the flared straight portion and the concave ring further have a transition portion 13, which is a tapered surface formed by extending the edge of the end of the flared straight portion close to the concave ring towards the concave ring. In the embodiment, the tapered surface is used to transition and connect the concave ring locking portion 12 (as shown in Figure 1 Thus, the pipe flared portion gradually transitions from the normal pipe diameter to the pipe diameter of the locking portion 12, which ensures the effectiveness and reliability of the pipe locking and the smoothness and simplicity of the pipe operation.

[0039] Further preferably, the flared straight portion, the concave ring and the tapered surface are integrally formed, which makes the structure of the punch die smooth and ensures the quality of the flaring operation.

[0040] Further preferably, the punch die further comprises a middle die section 2 connected to the front die section, the middle die section 2 is provided with an oil inlet hole 21, the tapered surface of the tapered head is provided with an oil nozzle 141, and the front die section 1 and the middle die section 2 are provided with an oil channel 4 connecting the oil inlet hole 21 and the oil nozzle 141. In the embodiment, the volatile oil channel 4 is designed inside the die (as shown in Figure 2 Before the flaring operation, the volatile oil is sprayed in a mist form from the oil nozzle at the insertion end through the internal oil channel 4 to lubricate the pipe opening, thereby avoiding the cracking or flattening of the pipe opening during the flaring process due to the dryness of the pipe.

[0041] Further preferably, the middle section 2 of the die is a second cylinder, the diameter of the second cylinder is greater than the diameter of the first cylinder, the oil inlet hole 21 is located on the side wall of the second cylinder, and the oil groove extends in an L shape inside the first cylinder and the second cylinder to communicate the oil inlet hole 21 and the oil injection nozzle 141. The cross-sectional diameter of the middle section 2 of the die is greater than the cross-sectional diameter of the front section of the die, which on the one hand prolongs the stroke of the oil channel 4, increases the oil storage space, and can ensure that the pipe port is sufficiently lubricated by one-time oil injection, and on the other hand, can also play a limiting role during the pipe flaring process to prevent the pipe flaring length from being too long. The L-shaped design of the oil channel 4 plays a buffering role during oil injection.

[0042] Further preferably, the conical head is provided with a plurality of oil injection nozzles 141, and the plurality of oil injection nozzles 141 are arranged around the conical surface of the conical head. In this embodiment, the plurality of conical heads are arranged in a circular shape around the conical surface of the conical head. Of course, other shapes such as an oval shape, a square shape, etc. are also possible. The oil channel 4 is in communication with the plurality of oil injection nozzles 141 (as shown in FIG. 4). Figure 3 The design of the oil injection nozzles 141 in this embodiment can make the volatile oil in the oil channel 4 sprayed in various directions on the inner wall of the pipe through the circularly arranged oil injection nozzles 141, ensuring the uniformity of oil injection lubrication of the inner wall of the pipe, thereby ensuring the flaring quality.

[0043] In this embodiment, a volatile oil inlet hole is designed in the middle section 2 of the punch die, and an atomizing oil injection nozzle 141 is designed on the conical head of the front section 1 of the punch die (as shown in FIG. 4 and FIG. 5). Figure 2 Figure 3 and Before the die is installed, a gas pressure pump and a volatile oil pipe are added to the pipe forming equipment, the volatile oil is connected to the punch oil channel 4, a sensing device is installed in conjunction with the volatile oil gas pressure pump, and the power supply and gas source are connected. In this way, the pipe port can be automatically lubricated with oil when the pipe approaches the punch, avoiding pipe port cracking or flattening due to dry copper pipe during flaring, and reducing the production failure rate.

[0044] Further preferably, the punch die is installed on the pipe forming equipment, the punch die includes a rear section 3, the middle section 2 is located between the front section and the rear section 3 of the die, a positioning groove 31 is formed on the rear section 3 of the die, and the punch die is installed on the pipe forming equipment through the positioning groove 31. In actual operation, first, the gas pressure oil circuit is connected to the oil inlet hole 21, the flaring die is installed and fixed to the pipe forming equipment through the positioning groove 31 (the installation and positioning method of the punch die designed in this embodiment is matched with the pipe forming equipment used in the market, so the die can be interchangeable with the conventional die), the gas source and power supply are turned on, and the pipe part flaring operation can be performed. The use method of this flaring die is the same as that of a general flaring die.

[0045] Further preferably, at least the front section 1 of the die is coated with a DLC metal coating, and the entire punch die can also be coated with a DLC metal coating. In this embodiment, the entire punch die surface is coated with a DLC metal coating to achieve self-lubrication by utilizing the friction between the inner wall of the pipe and the punch during the flaring operation. This reduces the friction between the punch and the pipe, improves the smoothness of the flared inner wall, and thus reduces the number of abnormal conditions such as flaring burrs and pipe scratches. In addition, the DLC coating also improves the surface hardness and wear resistance of the punch, thereby effectively prolonging the service life of the punch.

[0046] The above description is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications to the above-mentioned technical content within the scope of the technical solution of the present application to obtain equivalent embodiments with equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application shall still fall within the scope of the present application.

Claims

1. A punch die for pipe flaring, characterized by, The punch die comprises a die front section (1), a flaring section (11) and an insertion section (14) are arranged on the die front section (1), a locking section (12) is arranged between the flaring section (11) and the insertion section (14), the size of the flaring section (11) is larger than the internal size of the pipeline, the size of the locking section (12) is smaller than the internal size of the pipeline to be flared, during the pipeline flaring process, the pipeline to be flared passes through the insertion section (14), the locking section (12) and the flaring section (11) in sequence, and the flaring operation is performed on the pipeline to be flared by the flaring section (11); The die front section (1) is a first cylinder, the flaring section (11) is a flaring straight section arranged on the first cylinder, the insertion section (14) comprises a tapered head arranged at the end of the first cylinder, the tapered head is formed by extending from the edge of the end of the first cylinder to the middle part, the locking section (12) is a concave ring arranged between the flaring straight section and the tapered head, the cross-sectional diameter of the flaring straight section is larger than the internal diameter of the pipeline, and the cross-sectional diameter of the concave ring is smaller than the internal diameter of the pipeline; the locking section (12) is used for shaping the inner wall of the pipeline to be flared during the pipeline flaring process, so that the inner wall of the flared pipeline forms a convex structure matched with the concave ring; The punch die further comprises a die middle section (2) connected with the die front section, an oil inlet hole (21) is arranged on the die middle section (2), an oil injection nozzle (141) is arranged on the tapered surface of the tapered head, and an oil channel (4) connected with the oil inlet hole (21) and the oil injection nozzle (141) is arranged in the die front section (1) and the die middle section (2).

2. A punch die for flaring a tube as defined in claim 1, wherein, A transition section (13) is further arranged between the flaring straight section and the concave ring, the transition section (13) is a tapered surface formed by extending from the edge of one end of the flaring straight section close to the concave ring to the concave ring.

3. A punch die for flaring a tube as defined in claim 2, wherein, The flaring straight section, the concave ring and the tapered surface are integrally formed.

4. The punch die for pipe flaring according to claim 1, characterized by, The die middle section (2) is a second cylinder, the diameter of the second cylinder is larger than that of the first cylinder, the oil inlet hole (21) is arranged on the side wall of the second cylinder, and the oil channel (4) extends in the first cylinder and the second cylinder to communicate the oil inlet hole (21) and the oil injection nozzle (141).

5. The punch die for pipe flaring according to claim 4, characterized in that, A plurality of oil injection nozzles (141) are arranged on the tapered head, the plurality of oil injection nozzles (141) are arranged around the tapered surface of the tapered head, and the oil channel (4) is connected with the plurality of oil injection nozzles (141) respectively.

6. The punch die for pipe flaring according to claim 1, wherein The punch die is arranged on a pipeline forming device, the punch die further comprises a die rear section (3), the die middle section (2) is arranged between the die front section and the die rear section (3), a positioning groove (31) is arranged on the die rear section (3), and the punch die is installed on the pipeline forming device through the positioning groove (31).

7. The punch die for pipe flaring according to claim 1, wherein At least the die front section (1) is coated with a DLC metal coating.

8. A pipeline forming device comprising the punch die according to any one of claims 1-7.

Images