An inner core for producing an internally threaded aluminum pipe

Abstract

The application relates to the technical field of aluminum pipe processing, and particularly discloses an inner core for producing an internally threaded aluminum pipe, which comprises a floating core head and a threaded core head, the floating core head comprises an integrally formed working part and a connecting part, the outer diameter of the connecting part is smaller than that of the working part, the threaded core head is sleeved outside the connecting part, a reduced diameter section and a fixed diameter section are arranged on the working part, and the outer diameter of the fixed diameter section is smaller than that of the threaded core head. The application cancels the structure for connecting and fixing the core rod, redesigns the structures of the original floating core head and the threaded core head, thereby shortening the length of the internally threaded forming assembly, additionally, through the structural design of the floating core head, the overall stress state of the floating core head can be cancelled, the purpose of releasing the toughness of the spinning forming material by reducing the deformation amount of the locally formed internally threaded pipe is achieved, the spinning forming speed and the product quality are further improved, and the production efficiency and the production capacity of the internally threaded pipe are increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aluminum pipe processing, in particular to an inner core for inner threaded aluminum pipe production. BACKGROUND

[0002] The mainstream inner thread forming method on the market at present includes cold forming spinning method, the spinning method mainly is that extruded pipe blank is roughly drawn to semi-finished product (the drawing speed can reach 1000 m / min at the fastest), after online annealing (the speed can reach 300 m / min at the fastest), the semi-finished product is subjected to spinning forming (the mainstream speed on the market is 20-40 m / min) inner threaded pipe material, and the spinning forming speed is too low mainly because the length of the inner thread forming assembly is too long (the length is about 200 mm, which is composed of pre-drawing device + spinning device + sizing device, wherein the movable core head is connected with the threaded core head through the connecting fixed core rod, the connecting fixed core rod is a consumable part, and the length of the connecting fixed core rod leads to poor straightness), and the cold deformation of the inner threaded pipe material is too large during the spinning process, which causes the ductility of the annealed pipe material to rapidly decrease, so that the spinning forming speed cannot be too fast, and the speed that is too fast can cause the pipe material to be broken during forming.

[0003] Although the previous process technology is very mature, the low speed and low yield of the final forming stage determine that the product price is too high, which is not conducive to batch production, and the traditional inner thread forming assembly is too long, which leads to a long preparation time of the inner thread assembly (a skilled worker needs about 20 min to assemble once), and the normal spinning process is prone to unpredictable pipe breakage, which leads to frequent disassembly and assembly, long invalid preparation time, and greatly increased labor intensity of the workers, so that the production capacity of the inner threaded pipe cannot be mass produced due to low speed, low yield and low efficiency. SUMMARY

[0004] The purpose of the present application is to provide an inner core for inner threaded aluminum pipe production, which can adjust the structure of the original inner thread forming assembly (pre-drawing device + spinning device + sizing device) to the structure of the new inner thread forming assembly (spinning combination device + sizing device) through the structure of the present application, cancel the structure of the connecting fixed core rod, and redesign the structure of the original movable core head and threaded core head, thereby shortening the length of the inner thread forming assembly, and further improving the spinning forming speed and the production capacity of the inner threaded pipe by canceling the stress state of the movable core head through the structure design of the movable core head to release the toughness of the spinning formed material by reducing the deformation of the inner threaded pipe material.

[0005] To solve the above technical problems, the application provides an inner core for producing an internally threaded aluminum pipe, which comprises a floating core head and a threaded core head, the floating core head comprises an integrally formed working part and a connecting part, the outer diameter of the connecting part is smaller than that of the working part, the threaded core head is sleeved on the outer side of the connecting part, the working part is provided with a reduced diameter section and a fixed diameter section, and the outer diameter of the fixed diameter section is smaller than that of the threaded core head.

[0006] Further, the outer side of the connecting part is provided with external threads, the inner side of the threaded core head is provided with internal threads, and the connecting part is threadedly connected with the threaded core head.

[0007] Further, the length of the threaded core head is smaller than that of the connecting part, and the end of the connecting part is provided with a fixing member.

[0008] Further, the fixing member is a clamping sleeve type bolt and nut assembly, the clamping sleeve type bolt and nut assembly comprises a clamping sleeve type fixing bolt and a nut, one end of the clamping sleeve type fixing bolt passes through the working part and the connecting part and is fixed by the nut, the other end is provided with a sleeve joint part and the sleeve joint part is sleeved on the outer side of the connecting part.

[0009] Further, one end of the clamping sleeve type fixing bolt is provided with a first gasket and the first gasket is located between the nut and the working part, and the connecting part is provided with a second gasket and the second gasket is located between the sleeve joint part and the connecting part.

[0010] Further, the fixing member is a locking nut, the locking nut is sleeved on the outer side of the connecting part and a gasket is arranged therebetween.

[0011] The application has the following beneficial effects:

[0012] 1. The structure of the application can adjust the original internal thread forming assembly structure (pre-stretching device + spinning device + whole diameter device) to the new internal thread forming assembly structure (spinning combination device + whole diameter device), the application cancels the structure of connecting and fixing the core rod, and redesigns the structure of the original floating core head and threaded core head, thereby shortening the length of the internal thread forming assembly, in addition, through the structural design of the floating core head, the stress state of the floating core head can be cancelled, the purpose of releasing the toughness of the spinning forming material by reducing the deformation amount of the internal thread forming pipe material is achieved, the spinning forming speed and product quality are further improved, and the production efficiency and capacity of the internal thread pipe are increased.

[0013] 2. The present application can solve the technical problems of the background art, such as the long assembly and disassembly time of the inner thread forming assembly, and the poor straightness caused by the length of the inner thread forming assembly. The structure of the present application shortens the overall length of the inner thread forming assembly, improves the speed of spinning production of inner threads, increases the strength and durability of the inner thread forming assembly, reduces the assembly and disassembly time of the inner thread forming assembly, improves production efficiency, production capacity and product quality, and reduces the labor intensity of workers.

[0014] 3. The present application designs the state of the original spinning assembly in which the movable core head and the threaded core head are jointly stressed into a state in which only the movable core head plays a role in fixing and positioning in the inner hole of the pipe material through its reduced diameter section conical surface. The structure can ensure that the threaded core head is independently rotated and stressed. The influence of the overall deformation force is reduced at the local position of the pipe material, and the toughness and ductility of the spinning section pipe material are released. According to the theoretical cold deformation reduction calculation, the spinning speed can be increased from the original 20-40 m / min to 40-80 m / min under the condition of independent deformation of the threaded core head, thereby achieving the purpose of improving the spinning forming speed. In addition, the reduction of the overall cold deformation amount reduces the influence on the number of spinning pipe breaks, which can greatly reduce the labor intensity of workers.

[0015] 4. The inner threaded pipe produced by the present application can greatly increase the production speed and efficiency, break through the low-speed and low-yield processing technical barriers of the original design of the inner thread forming assembly in the manufacture of inner threaded pipes, and greatly reduce the manufacturing cost of enterprises, which is conducive to mass production and promotion. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 is a simplified schematic diagram of the original design of the inner thread forming device;

[0018] Figure 2 is a partial structure diagram of the original design of the inner thread forming assembly;

[0019] Figure 3 is a simplified schematic diagram of the inner thread forming device of the present application;

[0020] Figure 4 is a partial structure diagram of the inner thread forming assembly of the present application;

[0021] Figure 5 is a structural schematic diagram of a floating core head of the present application;

[0022] Figure 6 is a structural schematic diagram of a threaded core head of the present application;

[0023] Figure 7 is a structural schematic diagram of a clamping sleeve type fixing bolt of the present application;

[0024] wherein, Figure 1 in which: a-pre-stretching device, b-spinning device, c-diameter sizing device, d-cooling and lubricating device, e-winding device;

[0025] Figure 2 in which: a1-floating core head, a2-connected fixed core rod, b1-threaded core head, b2-spun steel ball, 100-pipe blank;

[0026] Figure 3 in which: f-spinning combined device, g-diameter sizing device, h-cooling and lubricating device, i-winding device;

[0027] Figures 4-7 in which: 1-floating core head, 2-threaded core head, 3-clamping sleeve type fixing bolt, 4-nut, 5-first gasket, 6-second gasket, 7-spun steel ball, 11-working part, 12-connecting part, 111-reducing section, 112-diameter sizing section, 31-one field, 32-sleeved part, 100-pipe blank. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the specification of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] In one specific embodiment of the present application, as shown in Figures 3-7 an inner core for producing an internally threaded aluminum pipe, comprising a floating core head 1 and a threaded core head 2, the floating core head 1 comprising an integrally formed working part 11 and a connecting part 12, the outer diameter of the connecting part 12 being smaller than the outer diameter of the working part 11, the threaded core head 2 being sleeved on the outside of the connecting part 12, the working part 11 being provided with a reducing section 111 and a diameter sizing section 112, the outer diameter of the diameter sizing section 112 being smaller than the outer diameter of the threaded core head 2;

[0030] The outer side of the connecting part 12 is provided with external threads, and the inner side of the threaded core head 2 is provided with internal threads, the connecting part 12 is threadedly connected with the threaded core head 2, the length of the threaded core head 2 is less than the length of the connecting part 12, the end of the connecting part 12 is provided with a fixing part, the fixing part is a sleeve type bolt and nut assembly, the sleeve type bolt and nut assembly comprises a sleeve type fixing bolt 3 and a nut 4, one end of the sleeve type fixing bolt 3 passes through the working part 11 and the connecting part 12 and is fixed by the nut 4, the other end is provided with a sleeving part 32 which is sleeved on the outer side of the connecting part 12, one end of the sleeve type fixing bolt 3 is provided with a first washer 5 which is located between the nut 4 and the working part 11, and the connecting part 12 is provided with a second washer 6 which is located between the sleeving part 32 and the connecting part 12.

[0031] As Figures 1-2 , it can be seen that the original internal thread forming device comprises a pre-stretching device a, a spinning device b, a sizing device c, a cooling and lubricating device d and a winding device e; wherein the original movable core head a1 and the threaded core head b1 are connected by a connecting fixed core rod a2, and the two ends of the connecting fixed core rod a2 are fixed with the movable core head a1 and the threaded core head b1 by a plurality of nuts; the original internal thread forming assembly is too long, which leads to too long preparation time of the internal thread assembly, and unpredictable pipe breakage in the normal spinning process, frequent assembly and disassembly process, too long invalid preparation time, and greatly increased labor intensity of the staff, and the production capacity of the internal thread pipe is unable to mass produce due to low speed, low yield and low efficiency.

[0032] In addition, the installation mode between the movable core head a1, the threaded core head b1 and the connecting fixed core rod a2 is not convenient, the assembly and disassembly time is long, and the length of the internal thread forming assembly leads to poor straightness, and the connecting fixed core rod is a consumable, which greatly increases the manufacturing cost.

[0033] And through the structure of the application, Figure 3 It can be seen that the design of the application can greatly shorten the internal thread forming assembly, and the assembly mode of the movable core head 1 and the threaded core head 2 is fast, only needs to be fixed by the sleeve type fixing bolt 3 and the nut 4, compared with the original assembly mode, the assembly mode between the movable core head 1 and the threaded core head 2 of the application greatly improves the spinning speed of the internal thread, increases the strength and durability of the internal thread forming assembly, reduces the assembly and disassembly time of the internal thread forming assembly, improves the production efficiency, production capacity and product quality, and reduces the labor intensity of the workers.

[0034] This invention redesigns the original spinning assembly, where both the floating mandrel and the threaded mandrel were subjected to force, so that only the floating mandrel, through its reduced-diameter conical surface, serves to fix and position itself within the inner hole of the tube. Because the outer diameter of the working part of the floating mandrel is approximately 1mm smaller than that of the threaded mandrel, the structure ensures that the threaded mandrel rotates and is subjected to force independently. This reduces the impact of overall deformation force in a localized area of ​​the tube, releasing the toughness and ductility of the spun section of the tube. Based on the theoretical reduction in cold deformation, the rotation speed can be increased from the original 20-40m / min to 40-80m / min when the threaded mandrel is subjected to force and deformation alone, thereby achieving the goal of increasing the spinning forming speed. In addition, the reduction in overall cold deformation reduces the number of tube breaks during spinning, which can greatly reduce the labor intensity of employees.

[0035] In another embodiment of the present invention, the fixing member is a locking nut, which is sleeved on the outside of the connecting part 12 and a washer is provided between them.

[0036] The above-disclosed embodiments are merely two preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. An inner core for producing internally threaded aluminum tubes, characterized in that, The device includes a movable mandrel (1) and a threaded mandrel (2). The movable mandrel (1) includes an integrally formed working part (11) and a connecting part (12). The outer diameter of the connecting part (12) is smaller than the outer diameter of the working part (11). The threaded mandrel (2) is sleeved on the outside of the connecting part (12). The working part (11) is provided with a reducing section (111) and a sizing section (112). The outer diameter of the sizing section (112) is smaller than the outer diameter of the threaded mandrel (2). The outer side of the connecting part (12) is provided with an external thread, and the inner side of the threaded core (2) is provided with an internal thread. The connecting part (12) is threadedly connected to the threaded core (2). The length of the threaded core (2) is less than the length of the connecting part (12). The end of the connecting part (12) is provided with a fixing member. The fastener is a ferrule bolt and nut assembly, which includes a ferrule fixing bolt (3) and a nut (4). One end of the ferrule fixing bolt (3) passes through the working part (11) and the connecting part (12) and is fixed by the nut (4). The other end is provided with a sleeve part (32) and the sleeve part (32) is sleeved on the outside of the connecting part (12).

2. The inner core for producing internally threaded aluminum tubes according to claim 1, characterized in that, One end of the ferrule-type fixing bolt (3) is provided with a first washer (5) and the first washer (5) is located between the nut (4) and the working part (11). The connecting part (12) is provided with a second washer (6) and the second washer (6) is located between the sleeve part (32) and the connecting part (12).

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