JP4592152B2 - Method of providing a processed part on a metal member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of providing a processed portion on a metal member.
[0002]
[Prior art]
At present, a great number of products, especially casing members, are made of resin by injection molding. From the viewpoint of environment and resource saving, it is desirable to make the casing from recyclable materials rather than difficult-to-recycle resins. ing. Therefore, the use of magnesium alloys is attracting attention. If magnesium alloy is used, it can be recycled, and it can be made thinner because it is stronger than resin, so it can be manufactured with a weight that is not much different from that of resin, especially when used for electronic equipment parts. Has the advantage of improving the electromagnetic shielding properties, so that the use of magnesium alloys for electronic device parts has attracted particular attention.
[0003]
By the way, it is often required to provide a processed part such as a screw hole in the housing or to perform processing. In the case of plastic, such a request can be met by heating and inserting a member having a screw hole into a previously formed insert hole.
However, in the case of a magnesium alloy, since the melting temperature is high, such a method cannot be taken, and conventionally, screw holes and the like have been processed by machining after casting.
However, in order to machine a large number of screw holes, complex and precise machining equipment with rotation is required, and chip treatment is also required, and tool replacement is also required, which takes a long time and machining costs are high. There is a problem.
[0004]
[Problems to be solved by the invention]
An object of this invention is to provide the method which can form a process part in a metal member easily in a short time in view of the said problem.
[0005]
[Means for Solving the Problems]
According to the first aspect of the present invention, the step of forming the insert hole in the metal member, the processed portion processed into a desired shape, the tooth tip radius slightly larger than the radius of the insert hole, and inclined with respect to the axis. Forming a pre-processed part having an insert portion having inclined teeth on the outer peripheral surface thereof from a metal of the same kind or different from the metal member, and forming the axis of the insert part of the pre-processed part with the metal member While aligning with the axis of the insert hole, press the pre-processed part toward the metal member and the inclined teeth of the insert part of the pre-processed part bite into the wall surface of the insert hole of the metal member to make the pre-processed part into the metal member. and step fit while twisting, Ri consists of,
The insert hole of the metal member is formed in a boss formed in advance in the metal member, the pre-processed part is a member having a screw hole, and the toothed insert part is formed on the outer surface in the radial direction of the screw hole,
The screw hole is a right-hand thread, and the inclined tooth of the insert part is formed downwardly to the axis of the machining part.
A method is provided.
According to this method, it is Rukoto attached to hardly metal member easily leaves the prefabricated screw holes.
[0006]
According to the second aspect of the present invention, there is provided the method according to the first aspect of the present invention, wherein the inclination angle of the insert portion of the pre-machined part with respect to the axis of the inclined tooth is 45 degrees or less.
According to the invention of claim 3, in the invention of claim 1, there is provided a method in which the step of attaching the pre-processed part to the metal member is performed in a heated state.
[0007]
According to the invention of claim 4, there is provided a method according to the invention of claim 1, wherein the metal of the metal member is aluminum, magnesium, titanium, beryllium, or an alloy containing any of them as a main component.
According to a fifth aspect of the present invention, there is provided a method according to the fourth aspect of the present invention, wherein the metal of the pre-processed part is a metal composed of a metal contained in the metal of the metal member.
According to the invention of claim 6, there is provided a method according to the invention of claim 4, wherein the metal of the metal member is an alloy mainly composed of magnesium and the metal of the pre-processed part is brass or an aluminum alloy.
According to the invention of claim 7, in the invention of claim 6, the radius of the tip circle of the inclined tooth of the insert portion formed in the pre-processed part is 0.1 mm to 0 than the radius of the insert hole formed in the metal member. A method is provided that is 2 mm larger.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention applied when a screw hole is provided in a boss formed on a flat portion of a magnesium alloy casing will be described with reference to the accompanying drawings.
FIG. 1 is an assembly diagram for explaining the method of the present invention. First, those shown in the lower part and the upper part of FIG.
[0010]
Shown in the lower part of FIG. 1A is a boss 20 having an insert hole 21 formed by casting integrally with the main body portion 10 of the housing 1. In this embodiment, the radius of the insert hole 21 is 1.6 mm, and the outer diameter of the upper surface 22 of the boss 20 is 2.75 mm.
[0011]
On the other hand, the upper stage of (A) shows a pre-processed part 30 having a screw hole 31 having a desired specification and having an insert portion 32 formed of a plurality of inclined teeth 33 inclined outward. The radius of the cutting edge circle of the inclined tooth 33 is 1.75 mm, and the radius of the insert hole 21 is 0.15 mm larger than 1.6 mm. As shown in FIG. 2, the inclined teeth 33 are inclined to the lower right with respect to the axis 35, and the inclination angle θ is preferably 30 degrees or more and 45 degrees or less.
[0012]
Next, at least the casing 1 is heated to about 150 ° C., and the axis 35 of the pre-processed component 30 is aligned with the axis 25 of the boss 20 as shown in FIG. Then, the pre-processed component 30 is placed on the boss 20, and the pressing force F is applied straight along the direction of the axis 25 of the boss 20 (= the axis 35 of the pre-processed component 30) from the upper surface 34 of the pre-processed component 30. . Then, the inclined teeth 33 of the insert portion 32 of the pre-processed component 30 advance obliquely while cutting the wall surface of the insert hole 21 of the boss 20, and the pre-processed component 30 is inserted into the boss 20 while being twisted.
FIG. 1C shows a completed state in which the pre-processed component 30 is pushed in until the upper surface 34 of the pre-processed component 30 coincides with the upper surface 22 of the boss 20.
[0013]
As described above, in this embodiment, the screw 31 is provided on the boss 20 simply by placing the pre-processed component 30 on which the screw 31 has been processed in advance on the boss 20 of the housing 1 and applying a straight pressing force. It is done. That is, the screw 31 can be provided on the boss 20 without machining, and the number of steps for providing the screw 31 can be greatly reduced.
[0014]
And while the screw hole 31 formed inside the insert portion 32 is a right-hand thread, the inclined teeth 33 of the insert portion 32 are formed downwardly and are bolts that are screwed into the screw hole 31 ( The insert 32 is prevented from being pulled out when it is pulled out counterclockwise.
[0015]
Further, the magnesium alloy as the material of the housing 1 is an alloy composed of 90% magnesium, 10% aluminum, and 1% zinc, while the pre-processed component 30 is made of brass or aluminum alloy. And when it is set as a waste product, if the pre-processed part 30 is melted together without removing it and the components of the alloy are adjusted, a magnesium alloy having the same composition ratio can be obtained.
[0016]
As described above, the case where the screw is provided on the boss has been described as an example. However, as long as the insert hole and the insert portion are formed as described above, the present invention can be applied to the case where other types of processed portions are provided.
[0017]
【The invention's effect】
The present invention is a method of providing a machined part in a metal member, and has a step of forming an insert hole in the metal member, a machined part machined into a desired shape, and a tooth tip radius slightly larger than the radius of the insert hole. Forming a pre-processed component having an insert portion having inclined teeth inclined with respect to the outer axis on the outer peripheral surface separately from the same or different metal as the metal member; and insert of the pre-processed component While aligning the axis of the part with the axis of the insert hole of the metal member, press the pre-processed part toward the metal member and cause the inclined teeth of the insert part of the pre-processed part to bite into the wall surface of the insert hole of the metal member. formed a pre workpiece to boss the steps of fitting while twisting the metal member, an insert hole adult Ri metal member from a previously formed on the metal member, pre workpiece screw holes A member toothed insert portion radially outward of the outer surface of the threaded hole with is formed,
The screw hole is a right-hand thread, and the inclined teeth of the insert part are formed to be lowered to the right with respect to the axis of the processed part.
Therefore, since the member having a screw hole can be attached to the metal member only by pressing, the screw hole can be provided in the metal member without machining the metal member directly. Moreover, the member having the screw hole is not pulled out when a bolt screwed into the screw is pulled out. And the member which has a screw hole can be formed separately, without waiting for completion | finish of the operation | work to a metal member, Moreover, since it can attach with simple press, working time can be shortened significantly. Moreover, when it becomes a waste product, it can melt together without removing the pre-processed parts.
In particular, if the metal of the pre-processed part is a metal made of a metal contained in the metal of the metal member as in the fifth aspect, recycling is easy.
[Brief description of the drawings]
FIG. 1 is an assembly diagram illustrating the present invention.
FIG. 2 is a diagram for explaining an inclination angle of an inclined tooth of an insert portion.
[Explanation of symbols]
20 ... Boss 21 ... Insert hole 30 ... Pre-processed product 31 ... Screw hole 32 ... Insert part 33 ... Teeth

Claims (7)

Forming an insert hole in the metal member;
A pre-machined part having a machined part machined into a desired shape and an insert part having a tooth tip radius slightly larger than the radius of the insert hole and having inclined teeth inclined with respect to the axis on the outer peripheral surface is a metal member. Forming the metal member separately from the same or different type of metal, and
While aligning the axis of the insert part of the pre-processed part with the axis of the insert hole of the metal member, the pre-processed part is pressed toward the metal member, and the inclined teeth of the insert part of the pre-processed part are inserted into the insert hole of the metal member. Inserting the pre-processed part into the metal member while twisting it into the wall; and
Ri consists of,
The insert hole of the metal member is formed in a boss formed in advance in the metal member, the pre-processed part is a member having a screw hole, and the insert portion is formed on the outer peripheral surface of the screw hole in the radial direction,
The screw hole is a right-hand thread, and the inclined tooth of the insert part is inclined downward to the right with respect to the axis of the machining part.
A method characterized by that.   2. The method according to claim 1, wherein an inclination angle of the insert portion of the pre-processed part with respect to the axis of the inclined tooth is set to 30 degrees or more and 45 degrees or less.   The method according to claim 1, wherein the step of attaching the pre-processed part to the metal member is performed in a heated state.   2. The method according to claim 1, wherein the metal of the metal member is aluminum, magnesium, titanium, beryllium, or an alloy containing any of them as a main component.   The method according to claim 4, wherein the metal of the pre-processed part is a metal composed of a metal included in the metal of the metal member.   The method according to claim 4, wherein the metal of the metal member is an alloy containing magnesium as a main component, and the metal of the pre-processed part is brass or an aluminum alloy.   The radius of the tip circle of the inclined tooth of the insert portion formed in the pre-processed part is 0.1 mm to 0.2 mm larger than the radius of the insert hole formed in the metal member. the method of.

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