Production process for copper pipe fitting, and copper pipe fitting

Abstract

Disclosed in the present invention are a production process for a copper pipe fitting, and a copper pipe fitting. The production process comprises: providing a pipe fitting raw material; providing a main cylinder mold, wherein a cavity of the main cylinder mold comprises: a pipe channel used for accommodating the pipe fitting raw material, a first annular groove arranged around the pipe channel, and second annular grooves arranged around the pipe channel; providing side cylinder core rods, wherein the side cylinder core rods each comprise a plurality of compressing structures, and the side wall of each compressing structure is provided with a first inclined portion, a second straight portion and a third inclined portion which are sequentially connected; and placing the pipe fitting raw material in the pipe channel for compression molding, so that the side cylinder core rods move in an axial direction of the pipe fitting raw material, extend into the interior of the pipe fitting raw material, and compress the inner wall of the pipe fitting raw material, thereby causing part of the pipe fitting raw material to enter and accumulate in the first and second annular grooves. According to the present invention, copper is used as the raw material, and one-step molding is achieved by means of the cooperation of the main cylinder mold and the side cylinder core rods, and compared with the turning and molding method using brass, the material yield is improved by 20% or more, and good plasticity and reduced risk of cracking are achieved.

Description

A production process for copper pipe fittings and copper pipe fittings Technical Field

[0001] The present invention relates to the technical field of copper pipe fittings, and in particular to a production process of copper pipe fittings and the copper pipe fittings produced by the process. Background Art

[0002] PEX pipes are widely used in indoor water supply pipes, food industry pipelines, water heating systems, central air conditioning pipeline systems, floor radiant heating systems, etc. due to their non-toxic and odorless, hygienic, non-corrosive, non-bacterial, and smooth inner walls.

[0003] Existing pipe fittings for PEX pipe connections are primarily made of brass and machined using CNC or specialized machines. However, these fittings present several challenges: First, brass fittings contain numerous impurities and a certain amount of lead, which poses a health hazard and does not meet increasingly stringent environmental protection requirements. Furthermore, the CNC turning process results in a very low yield rate.

[0004] Summary of the Invention

[0005] In view of this, an object of the present invention is to provide a production process for copper pipe fittings and the copper pipe fittings produced by the process.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A production process for copper pipe fittings, comprising:

[0008] Provide raw materials for pipe fittings;

[0009] A master cylinder mold is provided, wherein the master cylinder mold has a mold cavity, wherein the mold cavity at least includes: a tube groove for accommodating the tube material, a first annular groove arranged around the tube groove, and a second annular groove arranged around the tube groove;

[0010] A side cylinder core rod is provided, wherein the side cylinder core rod comprises at least a plurality of extrusion structures, and a side wall of each of the extrusion structures comprises at least a first inclined portion and a third inclined portion connected to each other;

[0011] The pipe raw material is placed in the pipe groove and extrusion molding is carried out, wherein the extrusion molding includes: the side cylinder core rod moves along the axial direction of the pipe raw material, extends into the interior of the pipe raw material, and squeezes the inner wall of the pipe raw material so that part of the material of the pipe raw material enters and accumulates in the first annular groove and / or the second annular groove to obtain an intermediate product.

[0012] In the above-mentioned production process of copper pipe fittings, the side wall of each of the extruded structures has a first inclined portion, a second straight portion, and a third inclined portion connected in sequence.

[0013] In the above-mentioned production process of copper pipe fittings, a first gap is formed between the outer surface of the extruded structure and the pipe groove, and the width of the first gap is smaller than the thickness of the pipe fitting raw material;

[0014] Each of the extrusion structures provides extrusion force and / or friction force to the inner wall of the pipe material, so as to move part of the inner wall material of the pipe material and simultaneously move the entire pipe material in the direction of the extrusion force and / or friction force.

[0015] In the above-mentioned production process of copper pipe fittings, the side cylinder core rod further comprises:

[0016] A first columnar structure connected to the extrusion structure forms a second gap between the first columnar structure and the tube groove, the second gap is larger than the first gap, and the first columnar structure provides an air avoidance function.

[0017] a second columnar structure connected to the first columnar structure, wherein the second columnar structure is coaxially arranged with the first columnar structure, the outer diameter of the second columnar structure matches the inner diameter of the tube groove, and an annular step portion is formed between the second columnar structure and the first columnar structure, and the step portion extrude the end face of the product;

[0018] The step portion abuts against the end of the pipe material and applies an axial thrust to the pipe material, so that the entire pipe material moves in the direction of the thrust;

[0019] The directions of the extrusion force, the friction force and the thrust are the same.

[0020] The above-mentioned production process of copper pipe fittings, wherein the pipe groove has two or more openings, and each of the openings is provided with a side cylinder core rod;

[0021] Each of the side cylinder core rods moves synchronously toward the middle of the pipe stock, causing each end of the pipe stock to move toward the middle of the pipe stock, so that part of the material of the pipe stock bulges and enters the first annular groove.

[0022] Alternatively, one or more of the plurality of side cylinder core rods move synchronously toward the middle of the pipe stock, and the rest of the plurality of side cylinder core rods remain fixed, so that part of the material of the pipe stock bulges and enters the first annular groove.

[0023] In the above-mentioned production process of copper pipe fittings, the side cylinder core rod further comprises:

[0024] A third columnar structure connected to the second columnar structure, wherein the outer diameter of the third columnar structure is larger than the inner diameter of the tube groove.

[0025] In the above-mentioned production process of copper pipe fittings, after the extrusion molding is carried out, the intermediate product is processed to meet the size of the drawing to obtain the finished product.

[0026] In the above-mentioned production process of copper pipe fittings, after the extrusion molding is carried out, the end face of the intermediate product is processed to meet the drawing size to obtain the finished product.

[0027] In the above-mentioned production process of copper pipe fittings, the pipe groove is a curved pipe groove;

[0028] Providing the pipe raw material, bending the pipe raw material, placing the bent pipe raw material in the pipe bend groove, and performing extrusion molding.

[0029] The above-mentioned production process of copper pipe fittings, wherein the pipe groove is a three-way pipe groove;

[0030] Providing the pipe fitting raw material, shaping the pipe fitting raw material into a tee raw material, removing excess accumulated raw material of the tee raw material, placing the tee raw material in the tee pipe groove, and performing extrusion molding.

[0031] The above-mentioned production process of copper pipe fittings, wherein the second straight portion is parallel to the axis of the side cylinder core rod;

[0032] There is an arc portion between the second straight portion and the first inclined portion, and between the second straight portion and the third inclined portion.

[0033] In the above-mentioned production process for copper pipe fittings, a V-shaped groove is formed between every two adjacent extruded structures, and between the first inclined portion of one extruded structure and the third inclined portion of the other extruded structure.

[0034] In the above-mentioned production process of copper pipe fittings, the first inclined portion and the third inclined portion are inclined surfaces or arc surfaces.

[0035] In the above-mentioned production process of copper pipe fittings, the first inclined portion of the extrusion structure located at the end of the side cylinder core rod is an arc surface, the third inclined portion of the extrusion structure located at the end of the side cylinder core rod is an inclined surface, and the first inclined portion and the third inclined portion of the remaining extrusion structures are all inclined surfaces.

[0036] A copper pipe fitting is obtained by any one of the above-mentioned production processes for the copper pipe fitting.

[0037] Due to the adoption of the above technology, the present invention has the following positive effects compared with the prior art:

[0038] (1) The present invention uses red copper as raw material, and forms the main cylinder mold and the side cylinder core rod in one step. The yield rate is increased by more than 20% compared with the brass turning forming method. It has good plasticity and is not easy to crack. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] FIG1 is a schematic diagram of the production process of the copper pipe fittings of the present invention.

[0040] FIG2 is a partially enlarged schematic diagram of FIG1 showing the production process of the copper pipe fittings of the present invention.

[0041] FIG3 is a schematic diagram of a side cylinder core rod in the production process of copper pipe fittings of the present invention.

[0042] FIG4 is a partially enlarged schematic diagram of FIG3 showing the production process of the copper pipe fittings of the present invention.

[0043] FIG5 is a schematic diagram of a main cylinder mold of the production process of copper pipe fittings of the present invention.

[0044] FIG6 is a partially enlarged schematic diagram of FIG5 showing the production process of the copper pipe fittings of the present invention.

[0045] In the accompanying drawings: 1. Main cylinder mold; 10. Tube groove; 11. First annular groove; 12. Second annular groove; 2. Side cylinder core rod; 21. First inclined portion; 22. Second straight portion; 23. Third inclined portion; 24. Arc portion; 25. First columnar structure; 26. Second columnar structure; 27. Step portion; 28. Third columnar structure; 3. Pipe fitting; 31. First annular structure; 32. Second annular structure; A. First gap; B. Second gap. DETAILED DESCRIPTION

[0046] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0047] In the description of the present invention, it should be understood that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “inside”, “outside”, “front”, “back”, “horizontal” and “vertical” are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or component referred to must have a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0048] It should be noted that the terms “horizontal” and “vertical” in the present invention are used to illustrate a rough positional relationship, rather than a strict “horizontal plane” or “vertical plane”.

[0049] 1 to 6 , a preferred embodiment of a production process for copper pipe fittings is shown, comprising: providing pipe raw material; providing a main cylinder mold 1, the main cylinder mold 1 having a cavity, the cavity comprising at least: a pipe groove 10 for accommodating the pipe raw material, a first annular groove 11 arranged around the pipe groove 10, and a second annular groove 12 arranged around the pipe groove 10; providing a side cylinder core rod 2, the side cylinder core rod 2 comprising at least a plurality of extrusion structures, the side wall of each extrusion structure having a first inclined portion 21, a second straight portion 22, and a third inclined portion 23 connected in sequence (in other embodiments, it may also have only the first inclined portion 21 and the third inclined portion 23 connected to each other); placing the pipe raw material in the pipe groove 10 and performing extrusion molding, wherein the extrusion molding comprises: the side cylinder core rod 2 moving along the axial direction of the pipe raw material, extending into the interior of the pipe raw material, and extruding the inner wall of the pipe raw material so that part of the material of the pipe raw material enters and accumulates in the first annular groove 21 and / or the second annular groove 22 to obtain an intermediate product.

[0050] In this embodiment, the raw material is guided to flow for forming by an extrusion structure, and the raw material is guided to perform secondary accumulation by multiple extrusion structures.

[0051] Specifically, the extrusion structure applies extrusion force and frictional force to the inner wall of the pipe stock. The extrusion force refers to the force applied to a portion of the inner wall of the pipe stock during feeding, due to the extrusion structure's larger outer diameter than the inner wall of the pipe stock. This forces the portion of the inner wall of the pipe stock to undergo plastic deformation and movement. Specifically, the extrusion force is typically applied via the first inclined portion 21.

[0052] The friction force refers to the friction force between the outer wall of the extrusion structure and the new inner wall of the pipe material after the extrusion structure has extruded the inner wall of the pipe material. Specifically, the friction force is usually provided by the second straight portion 22.

[0053] Furthermore, due to the plasticity and elasticity of the pipe raw material, after the first extrusion structure located at the end passes through a certain cross-section of the pipe raw material, the inner wall of the pipe raw material rebounds. At this time, the rebounded material of the pipe raw material is extruded for the second time through the second extrusion structure, and the rebounded material is deposited for the second time in the first annular groove 21 and / or the second annular groove 22.

[0054] Furthermore, multiple extrusion structures are arranged to implement multiple extrusions and stacking.

[0055] It should be noted that the first inclined portion 21, the second straight portion 22, and the third inclined portion 23 of the extrusion structure are formed into a spherical or approximately spherical shape, which is used to extrude the raw material into the cavity groove. Each extrusion structure has a second straight portion for increasing friction.

[0056] Preferably, the width of the second straight portion 22 is 0-1 mm.

[0057] Specifically, in some embodiments, the width of the second straight portion 22 may be 0 mm.

[0058] Preferably, the advancing speed of the side cylinder core rod 2 remains consistent.

[0059] More preferably, the forward speed of the side cylinder core rod 2 is 1 mm / s to ensure uniform molding of the finished product.

[0060] Furthermore, as a preferred embodiment, a first gap A is formed between the outer surface of the extrusion structure and the tube groove 10, and the width of the first gap A is less than the thickness of the pipe material; each extrusion structure provides an extrusion force and / or friction force to the inner wall of the pipe material, so that part of the material of the inner wall of the pipe material moves, and at the same time, the entire pipe material moves in the direction of the extrusion force and / or friction force.

[0061] Furthermore, as a preferred embodiment, the side cylinder core rod 2 also includes: a first columnar structure 25 connected to the extrusion structure, a second gap B is formed between the first columnar structure 25 and the tube groove 10, the second gap B is larger than the first gap A, and the first columnar structure 25 mainly provides an air avoidance function.

[0062] Furthermore, as a preferred embodiment, the side cylinder core rod 2 also includes: a second columnar structure 26 connected to the first columnar structure 25, wherein the second columnar structure 26 is coaxially arranged with the first columnar structure 25, the outer diameter of the second columnar structure 26 matches the inner diameter of the tube groove, and an annular step portion 27 is formed between the second columnar structure 26 and the first columnar structure 25, the step portion 27 is used to extrude the end face of the product, and the second columnar structure 26 plays a guiding role.

[0063] Furthermore, as a preferred embodiment, the step portion 27 abuts against the end of the pipe material and applies an axial thrust to the pipe material, so that the entire pipe material moves in the direction of the thrust.

[0064] Furthermore, as a preferred embodiment, the directions of the extrusion force, the friction force, and the thrust are the same.

[0065] Specifically, please refer to Figure 1. The extrusion force, friction force and thrust provided by the side cylinder core rod 2 on the left are all to the right, and the extrusion force, friction force and thrust provided by the side cylinder core rod 2 on the right are all to the left.

[0066] Specifically, in other embodiments, especially the key embodiments for forming three-way and four-way joints, it may also include one or two of the upper side cylinder core rod 2 and the lower side cylinder core rod 2. The extrusion force, friction force and thrust provided by the corresponding side cylinder core rod 2 are all in the axial direction and toward the inner side of the main cylinder mold 1.

[0067] The key of this embodiment is not limited to three-way and four-way, and there may be more passages.

[0068] Furthermore, as a preferred embodiment, the tube groove 10 has two or more openings, and a side cylinder core rod 2 is arranged at each opening; each side cylinder core rod 2 moves synchronously toward the middle of the tube raw material, so that each end of the tube raw material moves toward the middle of the tube raw material, so that part of the material of the tube raw material bulges and enters the first annular groove 11.

[0069] Of course, in other embodiments, one or more of the multiple side cylinder core rods 2 move synchronously toward the middle of the pipe raw material, and the rest of the multiple side cylinder core rods 2 remain fixed, so that part of the material of the pipe raw material bulges and enters the first annular groove 11.

[0070] Specifically, because the side cylinder mandrel 2 is positioned within the tubular stock, the center of the tubular stock tends to bulge outward. More specifically, because the first annular groove 11 does not exert pressure on the outer wall of the tubular stock, the center of the tubular stock tends to bulge toward the interior of the first annular groove 11. As the ends of the tubular stock move further toward the center of the tubular stock, the outer wall of the bulged portion of the tubular stock conforms to the inner wall of the first annular groove 11, forming the tubular body.

[0071] Furthermore, as a preferred embodiment, the inner wall of the pipe material at the first annular groove 11 forms a hollow structure.

[0072] Specifically, because the structure at the first annular groove 11 is formed by bulging of the tubular stock, the inner wall of the first annular groove 11 naturally forms a hollow structure. More specifically, if the side cylinder mandrel 2 has a large designed feed rate, this hollow structure may also be reduced or even eliminated in some embodiments due to the bulging and filling of the tubular stock. More specifically, those skilled in the art can adjust the feed rate of the side cylinder mandrel according to actual needs to form a hollow or solid structure at the first annular groove 11.

[0073] Furthermore, as a preferred embodiment, the side cylinder core rod 2 further includes: a third columnar structure 28 connected to the second columnar structure 26 , and the outer diameter of the third columnar structure 28 is greater than the inner diameter of the tube groove 10 .

[0074] Specifically, the third columnar structure 28 is used to limit the feeding depth of the side cylinder core rod 2. More specifically, when the end surface of the third columnar structure 28 abuts against the side surface of the main cylinder mold 1, the side cylinder core rod 2 stops feeding.

[0075] Furthermore, as a preferred embodiment, after the extrusion molding is carried out, the intermediate product is processed to meet the drawing size (i.e., flat edge) to obtain the finished product.

[0076] Specifically, when providing pipe fittings raw materials, a saw blade cutting machine is selected to cut the copper pipe fittings raw materials into raw material lengths that meet the drawings.

[0077] Specifically, the extrusion molding includes: the main cylinder mold 1 is closed, the side cylinder core rod 2 moves along the axial direction of the pipe raw material, extends into the interior of the pipe raw material, and squeezes the inner wall of the pipe raw material so that part of the material of the pipe raw material enters and accumulates in the first annular groove 21 and the second annular groove 22, the side cylinder core rod 2 withdraws, and the main cylinder mold 1 is opened.

[0078] In the prior art, brass raw materials are formed through high-temperature heating, shot blasting, annealing, and numerical control processes, which are complex and have low production efficiency. In contrast, in this embodiment, copper raw materials are formed in one step, with the main processes only involving extrusion and flattening, resulting in fast forming and high production efficiency.

[0079] Preferably, the second annular groove 12 is located on one side or both sides of the first annular groove 11 .

[0080] Preferably, in one embodiment, one first annular groove 11 may be included, or a plurality of first annular grooves 11 may be included, and a second annular groove 12 is arranged on one side or both sides of each first annular groove 11 .

[0081] Preferably, the depth of the first annular groove 11 is greater than the depth of the second annular groove 12 .

[0082] Preferably, the first annular groove 11 is used to form a blocking portion of the copper pipe fitting, and the second annular groove 12 is used to form a fixing ring or a sealing ring of the copper pipe fitting.

[0083] Preferably, the outermost side of the second annular groove 12 is provided with an inclined surface facing outward, and the inclined surface is used for forming a chamfer. In this embodiment, the outermost side refers to the position closest to the end of the copper pipe.

[0084] Furthermore, as a preferred embodiment, the pipe groove 10 is a straight pipe two-way pipe groove.

[0085] Specifically, for the straight pipe two-way pipe groove, the production process of this embodiment is specifically as follows: providing pipe raw materials, extrusion molding, and processing to meet the drawing size.

[0086] Furthermore, as a preferred embodiment, the pipe groove 10 is a curved pipe groove.

[0087] Specifically, for the bent pipe groove, the production process of this embodiment is as follows: providing pipe raw materials, bending the pipe raw materials, placing the bent pipe raw materials in the bent pipe groove, and performing extrusion molding and processing to meet the drawing size.

[0088] More specifically, when bending is performed, a 180° straight tube is deformed into 90° or 45°.

[0089] Furthermore, as a preferred embodiment, the pipe groove 10 is a two-way pipe groove with straight pipes and reducing diameters.

[0090] Specifically, for the straight pipe reducing two-way pipe groove, the production process of this embodiment is specifically as follows: providing pipe raw materials, extrusion molding, and processing to meet the drawing size.

[0091] Furthermore, as a preferred embodiment, the pipe groove 10 is a three-way pipe groove.

[0092] Specifically, for the tee pipe groove, the production process of this embodiment is as follows: providing pipe raw materials, forming the pipe raw materials into tee raw materials, removing excess accumulated raw materials of the tee raw materials (i.e., boring holes), placing the tee raw materials in the tee pipe groove, and performing extrusion molding.

[0093] Furthermore, as a preferred embodiment, the second straight portion 22 is parallel to the axis of the side cylinder core rod 2 .

[0094] Furthermore, as a preferred embodiment, there is an arc portion 24 between the second straight portion 22 and the first inclined portion 21 and between the second straight portion 22 and the third inclined portion 23 to increase fluidity and prevent material from falling off.

[0095] Preferably, the radius of the arc portion 24 is 0.5-2 mm.

[0096] Furthermore, as a preferred embodiment, between every two adjacent extrusion structures, a V-shaped groove is formed between the first inclined portion 21 of one extrusion structure and the third inclined portion 23 of the other extrusion structure.

[0097] Furthermore, as a preferred embodiment, the tube groove 10 has two or more openings, and a cylinder core rod 2 is arranged at each opening.

[0098] Furthermore, as a preferred embodiment, the first inclined portion 21 and the third inclined portion 23 are inclined surfaces or arc surfaces.

[0099] Furthermore, as a preferred embodiment, the first inclined portion 21 of the extrusion structure located at the end of the side cylinder core rod 2 is an arc surface, the third inclined portion 23 of the extrusion structure located at the end of the side cylinder core rod 2 is an inclined surface, and the first inclined portion 21 and the third inclined portion 23 of the remaining extrusion structures are all inclined surfaces.

[0100] Furthermore, as a preferred embodiment, the pipe groove 10 is a PEX groove, and its size is in accordance with the ASTM 1807 standard size.

[0101] Furthermore, as a preferred embodiment, it includes a main cylinder for providing pressure to the main cylinder mold 1 and also includes a side cylinder for providing pressure to the side cylinder core rod 2.

[0102] Furthermore, as a preferred embodiment, preferably, 3 / 4 and below models use a 63T extruder, and the side cylinder extrusion pressure is 10Mpa. Preferably, 3 / 4 and above models to 2 inches models use a 100T extruder, and the side cylinder pressure is 15Mpa.

[0103] Specifically, the minimum pressure of the main cylinder of the equipment is 20 MPa to prevent the side cylinder core rod 2 from entering the workpiece and causing the cylinder to lift.

[0104] Furthermore, as a preferred embodiment, a copper pipe fitting is provided, characterized in that it is obtained by the above-mentioned production process of the copper pipe fitting.

[0105] Specifically, referring to FIG. 7 to FIG. 9 , three types of copper pipe fittings 3 are shown respectively. The copper pipe fittings 3 include a straight pipe coupling, an elbow pipe, and a straight pipe coupling with a reducing diameter.

[0106] Specifically, the copper pipe fittings 3 of this embodiment each include a first annular structure 31 and a second annular structure 32 , wherein the first annular structure 31 is formed by the first annular groove 11 , and the second annular structure 32 is formed by the second annular groove 12 .

[0107] More specifically, the first annular structure 31 and the second annular structure 32 can be obtained by completely filling the first annular groove 11 with the material of the pipe raw material.

[0108] More specifically, as shown in FIG. 7 , the first annular structure 31 can be formed by the extrusion force applied by the extrusion structures at both ends of the tubular material, causing it to move toward the center of the first annular groove 11 and deform, causing the outer wall of the tubular material to bulge outward while simultaneously conforming to the inner wall of the first annular groove 11. In this embodiment, the inner wall of the first annular structure 31 may have a hollow structure.

[0109] Furthermore, as a preferred embodiment, the outer diameter of the first annular structure 31 is greater than the outer diameter of the second annular structure 32 .

[0110] Furthermore, as a preferred embodiment, each end of the copper pipe 3 has a second annular structure 32 , and the second annular structure 32 has a chamfer for guiding the insertion of the PEX pipe.

[0111] Furthermore, as a preferred embodiment, the copper pipe fitting 3 can be operably assembled with the PEX pipe.

[0112] Specifically, the end of the copper pipe 3 is inserted into the interior of the PEX pipe, forming a closed and surrounding sealing structure with the inner wall of the PEX pipe through multiple second ring structures 32. The end of the PEX pipe abuts against the first ring structure 31, and the first ring structure 3 is used to implement positioning.

[0113] The above description is only a preferred embodiment of the present invention and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A production process for copper pipe fittings, characterized in that: include: Provide raw materials for pipe fittings; A master cylinder mold is provided, wherein the master cylinder mold has a mold cavity, wherein the mold cavity at least includes: a tube groove for accommodating the tube material, a first annular groove arranged around the tube groove, and a second annular groove arranged around the tube groove; A side cylinder core rod is provided, wherein the side cylinder core rod comprises at least a plurality of extrusion structures, and a side wall of each of the extrusion structures comprises at least a first inclined portion and a third inclined portion connected to each other; The pipe raw material is placed in the pipe groove and extrusion molding is carried out, wherein the extrusion molding includes: the side cylinder core rod moves along the axial direction of the pipe raw material, extends into the interior of the pipe raw material, and squeezes the inner wall of the pipe raw material so that part of the material of the pipe raw material enters and accumulates in the first annular groove and / or the second annular groove to obtain an intermediate product.

2. The production process of copper pipe fittings according to claim 1, characterized in that: Each side wall of the extruded structure comprises a first inclined portion, a second straight portion, and a third inclined portion which are connected in sequence.

3. The production process of copper pipe fittings according to claim 1, characterized in that: A first gap is formed between the outer surface of the extruded structure and the tube groove, and the width of the first gap is smaller than the thickness of the tube raw material; Each of the extrusion structures provides extrusion force and / or friction force to the inner wall of the pipe material, so as to move part of the inner wall material of the pipe material and simultaneously move the entire pipe material in the direction of the extrusion force and / or friction force.

4. The production process of copper pipe fittings according to claim 3, characterized in that: The side cylinder core rod also includes: A first columnar structure connected to the extrusion structure forms a second gap between the first columnar structure and the tube groove, and the second gap is larger than the first gap. A second columnar structure connected to the first columnar structure, wherein the second columnar structure is coaxially arranged with the first columnar structure, and the outer diameter of the second columnar structure is equal to the inner diameter of the tube groove. Matching, an annular step portion is formed between the second columnar structure and the first columnar structure; The step portion abuts against the end of the pipe material and applies an axial thrust to the pipe material, so that the entire pipe material moves in the direction of the thrust; The directions of the extrusion force, the friction force and the thrust are the same.

5. The production process of copper pipe fittings according to claim 4, characterized in that: The pipe groove has two or more openings, and each opening is provided with a side cylinder core rod; Each of the side cylinder core rods moves synchronously toward the middle of the pipe raw material, causing each end of the pipe raw material to move toward the middle of the pipe raw material, so that part of the material of the pipe raw material bulges and enters the first annular groove; or, one or more of the multiple side cylinder core rods move synchronously toward the middle of the pipe raw material, and the rest of the multiple side cylinder core rods remain fixed, so that part of the material of the pipe raw material bulges and enters the first annular groove.

6. The production process of copper pipe fittings according to claim 4, characterized in that: The side cylinder core rod also includes: A third columnar structure connected to the second columnar structure, wherein the outer diameter of the third columnar structure is larger than the inner diameter of the tube groove.

7. The production process of copper pipe fittings according to claim 1, characterized in that: After the extrusion molding is carried out, the intermediate product is processed to meet the size of the drawing to obtain a finished product.

8. The production process of copper pipe fittings according to claim 1, characterized in that: The pipe groove is a curved pipe groove; Providing the pipe raw material, bending the pipe raw material, placing the bent pipe raw material in the pipe bend groove, and performing extrusion molding.

9. The production process of copper pipe fittings according to claim 1, characterized in that: The pipe groove is a three-way pipe groove; Providing the pipe fitting raw material, shaping the pipe fitting raw material into a tee raw material, removing excess accumulated raw material of the tee raw material, placing the tee raw material in the tee pipe groove, and performing extrusion molding.

10. The production process of copper pipe fittings according to claim 2, characterized in that: The second straight portion is parallel to the axis of the side cylinder core rod; There is an arc portion between the second straight portion and the first inclined portion, and between the second straight portion and the third inclined portion.

11. The production process of copper pipe fittings according to claim 1, characterized in that: Between every two adjacent extrusion structures, a V-shaped groove is formed between the first inclined portion of one extrusion structure and the third inclined portion of the other extrusion structure.

12. The production process of copper pipe fittings according to claim 1, characterized in that: The first inclined portion and the third inclined portion are inclined surfaces or arc surfaces.

13. The production process of copper pipe fittings according to claim 12, characterized in that: The first inclined portion of the extrusion structure located at the end of the side cylinder core rod is an arc surface, the third inclined portion of the extrusion structure located at the end of the side cylinder core rod is an inclined surface, and the first inclined portion and the third inclined portion of the remaining extrusion structures are all inclined surfaces.

14. A copper pipe fitting, characterized in that: Obtained by the production process of the copper pipe fittings described in any one of claims 1 to 9.

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