WO2017166290A1 - Method for extruding and connecting aluminium pipe and steel shaft end piece - Google Patents

Abstract

Disclosed is a method for extruding and connecting an aluminium pipe and a steel shaft end piece. The method comprises the following steps: A, a step of reaming the end part of an aluminium pipe in a stepped manner; B, a step of preparing a steel shaft end piece, in which the steel shaft end piece prepared in this step is separated in a stepped manner into at least two cylindrical sections along the axial direction, including a cylindrical section having a larger diameter and a cylindrical section having a smaller diameter, so as to form a stepped shaft, the diameter of the cylindrical section having a larger diameter is slightly larger than the aperture of an end hole newly formed in step A, and an inner groove which is sunk inwards is formed in a shoulder root part of the shaft; and C, a step of extruding and connecting. Using this method to connect the aluminium pipe and the steel shaft end piece can form an interference fit therebetween. The aluminium material at the corner of the stepped hole of the aluminium pipe can be fed into the inner groove in the steel shaft end piece to form an inverted connection, so that the connection firmness between the aluminium pipe and the steel shaft end piece can be further enhanced, and therefore the connected piece has the characteristics of firm connection and not loosening with an exterior force.

Description

Squeeze joint method of aluminum pipe fitting and steel shaft end piece Technical field

The present invention relates to a method of producing a metal joint, and more particularly to a method of extrusion joining of an aluminum pipe member and a steel shaft end member.

Background technique

In the printer, copier and other equipment need to use a large number of roll core, taking into account the manufacturing cost, service life, weight and other factors of the roll core, the structure of the existing roll core is generally in the form of aluminum pipe fittings and steel shaft end pieces.

Referring to Figures 1 and 2, the joining method of the existing aluminum pipe fittings and the steel shaft end pieces is to directly press the steel shaft end pieces into the hollow holes of the aluminum pipe fittings to form an interference fit, thereby completing the aluminum pipe fittings. Engagement with steel shaft end pieces.

According to the above joining method, the aluminum pipe fitting and the steel shaft end piece can be joined together by the interference fit, but there is always a phenomenon of looseness and falling off, and although the probability of occurrence is not high, the negative influence is large.

Summary of the invention

The technical problem to be solved by the present invention is to provide a method of extrusion bonding of an aluminum pipe member and a steel shaft end member, which can improve the joint fastness of the aluminum pipe member and the steel shaft end member.

In order to solve the above technical problem, the technical solution adopted by the present invention is: a method for extrusion bonding of an aluminum pipe member and a steel shaft end member, comprising the following steps:

A. Step step of reaming the end of the aluminum pipe fitting, the step of reaming the hollow hole of the aluminum pipe member at the end thereof, so that the hole diameter of the newly formed end hole is larger than the hole diameter of the hollow hole to form a stepped hole;

B. The preparation step of the steel shaft end piece, the steel shaft end piece prepared in this step is divided into at least two cylinders by the step in the axial direction, one section is a cylinder with a larger diameter section, and one section is a cylinder of a smaller diameter section. Forming a stepped shaft, the diameter of the larger diameter cylinder is slightly larger than the diameter of the newly formed end hole in the step A, and the inner groove recessed inward is provided at the root of the shoulder;

C. Squeeze bonding step, which presses the steel shaft end piece prepared in step B into the aluminum pipe fitting through the step A reaming in step A, so that the steel shaft end piece has a larger diameter cylindrical body and an aluminum pipe fitting The end holes form an interference fit and cause the shoulder of the steel shaft end piece to press against the corner of the stepped hole of the aluminum pipe, forcing the aluminum material at the corner to deform into the inner groove of the steel shaft end piece.

Further, the step B prepares the inner groove of the steel shaft end piece to be inclined inwardly.

Further, the step B prepares the shoulder top of the steel shaft end piece as a sharp angle toward the direction of the smaller diameter cylinder.

Further, in the step B, the inner groove of the steel shaft end piece is prepared to be inclined inwardly, and the inner circumferential surface of the inner groove is in the direction of the cylinder from the smaller diameter cylinder to the larger diameter cylinder, horizontally The angle of the downward inclination ranges from 10 degrees to 20 degrees, and the outer circumferential surface of the inner groove and the circumferential surface of the larger diameter cylinder form a sharp angle toward the top of the cylinder of the smaller diameter at the top of the shoulder, the sharp angle The angle ranges from 20 degrees to 40 degrees.

Further, the diameter of the smaller diameter cylinder of the steel shaft end piece prepared in the step B is equivalent to the diameter of the hollow hole of the aluminum pipe fitting, so that the diameter of the steel shaft end piece is smaller in the step C in the step C The body forms a transitional fit with the hollow holes of the aluminum pipe.

Further, the step height of the stepped hole formed by the step A ranges from 0.3 mm to 1 mm.

By combining the aluminum pipe fitting and the steel shaft end piece by the method of the invention, the steel shaft end piece and the aluminum pipe piece can be formed into an interference fit, and the aluminum material at the corner hole of the aluminum pipe fitting can enter the steel shaft. The inner groove of the end piece forms an inverted joint to further strengthen the joint fastness of the aluminum pipe member and the steel shaft end piece, so that the joint member manufactured by the method of the invention has the characteristics of strong joint and non-external force and does not fall off.

DRAWINGS

Figure 1 is a schematic view showing the structure of a prior art aluminum pipe fitting and a steel shaft end piece;

2 is a schematic structural view of a conventional aluminum pipe fitting joined to a steel shaft end piece;

3 is an aluminum pipe fitting after the first step and the second step in the first embodiment of the present invention; Schematic diagram of the steel shaft end piece;

4 is a schematic view showing the joint structure of an aluminum pipe member and a steel shaft end member after the third step in the first embodiment of the present invention;

Figure 5 is a schematic view showing the structure of an aluminum pipe member and a steel shaft end member after the first step and the second step in Embodiment 2 of the present invention;

Figure 6 is a schematic view showing the joint structure of the aluminum pipe fitting and the steel shaft end piece after the third step in the second embodiment of the present invention;

7 is a schematic structural view of an aluminum pipe member and a steel shaft end member after the first step and the second step in Embodiment 3 of the present invention;

Figure 8 is a schematic view showing the joint structure of the aluminum pipe fitting and the steel shaft end piece after the third step in the third embodiment of the present invention;

9 is a schematic structural view of an aluminum pipe member and a steel shaft end member after the first step and the second step in Embodiment 4 of the present invention;

Figure 10 is a schematic view showing the joint structure of an aluminum pipe member and a steel shaft end member after the third step in the fourth embodiment of the present invention.

The labels in the figure are:

(1) Aluminum pipe fittings, (10) stepped holes, (11) hollow holes, (12) end holes;

(2) Steel shaft end piece, (20) stepped shaft, (21) larger diameter cylindrical body, (211) circumferential surface of larger diameter cylinder, (22) smaller diameter cylinder, (23) ) the shoulder, the inner groove of (24), the inner circumferential surface of the groove in (241), the outer circumferential surface of the groove in (242), and the sharp corner of (25).

detailed description

The detailed description of the technical contents, structural features, and the objects and effects of the present invention will be described in detail below with reference to the embodiments.

Example 1:

Referring to Figures 3 and 4, the extrusion joining method of the aluminum pipe fitting 1 of the grade A6063 and the steel shaft end piece 2 of the grade SUS416 or SUM23 or SUM24L comprises the following steps:

In the first step, the aluminum pipe fitting 1 having a diameter of 8 mm and a hollow hole diameter of 5 mm is subjected to end step reaming. This step passes through the two ends of the processing machine, and adopts a processing parameter of a spindle rotation speed of 4000 rpm and a feed amount of 0.02 mm. An end hole 12 having a diameter of 6 mm coaxial with the hollow hole 11 is newly formed at the end of the hollow hole 11 of the aluminum pipe member 1, thereby forming a stepped hole 10 having a step height of 0.5 mm.

In the second step, the steel shaft end piece 2 is prepared by using a numerical control lathe and using a machining parameter of a spindle rotation speed of 3,500 rpm and a feed rate of 0.03 mm. The steel shaft end piece 2 prepared in this step is divided into two by the step in the axial direction. Segment cylinder, the right segment is the larger diameter cylinder 21, the left segment is the smaller diameter cylinder 22, forming the stepped shaft 20, the diameter of the larger cylinder 21 is 6.03 mm, slightly larger than the first step The diameter of the newly formed end hole 12, the diameter of the smaller diameter cylinder 22 is 5 mm, which is equivalent to the diameter of the hollow hole 11 of the aluminum pipe member 1, and this step is also on the shoulder of the steel shaft end piece 2. At the root of the 23rd, through the numerical control lathe, using the machining parameters of the spindle rotation speed of 3500 rpm and the feed amount of 0.02 mm, an inner groove 24 recessed inward in the vertical direction is formed, and the inner groove 24 has a concave depth and inner portion. The concave width is 0.7 mm.

In the third step, press-bonding is performed by a press-in machine using a processing parameter of a cylinder thrust of 6000 N. This step presses the steel shaft end piece 2 prepared in the second step into the aluminum stepped by the first step. The pipe fitting 1 is such that the larger diameter cylindrical body 21 of the steel shaft end piece 2 forms an interference fit with the end hole 12 of the aluminum pipe member 1, and the steel shaft end piece 2 has a smaller diameter cylinder 22 and aluminum. The hollow hole 11 of the pipe fitting 1 forms a transition fit, and the shoulder 23 of the steel shaft end piece 2 is pressed against the corner of the stepped hole 10 of the aluminum pipe member 1, forcing the aluminum material at the corner to be deformed into the steel shaft end. Inner groove 24 of piece 2.

By joining the aluminum pipe member 1 and the steel shaft end member 2 by the above three steps, not only can the steel shaft end piece 2 be formed into an excessive fit with the aluminum pipe member 1, but also the aluminum pipe member 1 stepped hole 10 can be formed. The aluminum material at the corner enters the inner groove 24 of the steel shaft end piece 2 to form an inverted joint, which greatly enhances the joint fastness of the aluminum pipe member 1 and the steel shaft end piece 2.

Example 2:

Referring to Figures 5 and 6, this embodiment differs from Embodiment 1 in that, in the second step, the inner groove 24 of the steel shaft end piece 2 is prepared to be inclined downward by 45 degrees.

The inclined inner groove 24 is prepared in the second step, which facilitates the entry of the aluminum material into the inner groove 24 in the third step to form an inverted joint.

Example 3:

Referring to Figures 7 and 8, the difference between this embodiment and the embodiment 1 is that, in the second step, the top of the shoulder 23 of the steel shaft end piece 2 is prepared as a sharp angle 25 having an angle of 30 degrees. The angle 25 is oriented in the direction of the smaller diameter cylinder 22 of the diameter.

In the second step, the top of the shoulder 23 of the steel shaft end piece 2 is formed into a sharp corner 25, which is advantageous for forming a pressing at the corner of the stepped hole 10 of the aluminum pipe member 1 in the third step.

Example 4:

Referring to Figures 9 and 10, this embodiment differs from Embodiment 1 in that the second step prepares the inner groove 24 of the steel shaft end piece 2 to be inclined inwardly, and the inner circumferential surface 241 of the inner groove. Tilting 15 degrees horizontally downward from left to right, the outer peripheral surface 242 of the inner groove and the circumferential surface 211 of the larger diameter cylinder form a sharp corner 25 toward the top of the shoulder 23, the angle of the sharp corner 25 being 30 degrees.

In the second step, the inner groove 24 of the steel shaft end piece 2 is prepared to be inclined, and the top of the shoulder 23 is prepared as a sharp corner 25, which is advantageous for forming a squeeze at the corner of the stepped hole 10 of the aluminum pipe member 1 in the third step. The pressure is also favorable for the aluminum material to enter the inner groove 24 to form an inverted joint.

The method of the above embodiment is used to join the aluminum pipe member 1 and the steel shaft end member 2, and in particular, the tensile strength of the joint member can be enhanced, and the tensile strength is increased by 200 to 350 kg force compared with the joint member manufactured by the prior art method. The joints are no longer loose or fall off during normal circulation, installation and use.

The above is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention. Any minor modifications, equivalent changes, and modifications made to the above embodiments in accordance with the technical spirit of the present invention are still Within the scope of the present technology.

Claims (3)

The method of extrusion joining of any of the aluminum pipe fittings and the steel shaft end piece according to any one of claims 1 to 4, wherein the steel shaft end piece prepared in the step B has a smaller diameter cylinder. The diameter of the hole is equivalent to the diameter of the hollow hole of the aluminum pipe member, so that the smaller diameter cylinder of the steel shaft end piece in step C forms a transition fit with the hollow hole of the aluminum pipe member. A method of extrusion joining of an aluminum pipe member and a steel shaft end member according to claim 5, wherein the step height of the stepped hole formed by the step A ranges from 0.3 mm to 1 mm. A method of press-joining an aluminum pipe member and a steel shaft end member according to any one of claims 1 to 4, wherein the step height of the stepped hole formed by the step A ranges from 0.3 mm to 1 mm.

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