JP5250878B2 - Tubular member processing method and tubular member processing apparatus - Google Patents

Description

  The present invention relates to a method for processing a tubular member and a tubular member processing apparatus that make the tubular member thin while deforming the cross-sectional shape of the tubular member without using a die.

  As a conventional method for thinning a tubular member, there is a dieless drawing without using a die. Dieless drawing is a method in which a tubular member is drawn out while being uniformly induction-heated in the circumferential direction so that the tubular member is drawn at a high-temperature portion to form a thin tube (see, for example, Patent Document 1).

JP 2004-332107 A (6th paragraph)

  According to the conventional dieless drawing, the tubular member before drawing and the tubular member after drawing have substantially the same cross-sectional shape, and the cross-sectional shape is deformed, for example, a cylindrical tube is hollow with a square cross-section. It could not be transformed into a tube.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a tubular member that can be thinned while deforming the cross-sectional shape of the tubular member without using a die. It is in providing a processing method and a tubular member processing apparatus.

  In order to solve the above-mentioned problems, a method for processing a tubular member according to the present invention includes: heating the tubular member locally in the circumferential direction and pulling out the tube without a die while giving a difference in deformation resistance in the circumferential direction. In this method, the member is thinned while changing the cross-sectional shape.

  The tubular member before processing has a cylindrical shape, and when the tubular member is heated at n positions spaced apart from each other in the circumferential direction during drawing, the sectional shape of the tubular member after drawing is a hollow n-gonal shape. is there. The n-gon shape here includes a case where a circular portion remains in the corner portion. n is a natural number.

  It is preferable to pull out the tubular member while cooling the atmosphere located around the portion of the tubular member that is locally heated in the circumferential direction. You may pull out the said tubular member, cooling the area | region located between the area | regions heated locally among the said tubular members locally.

The tubular member processing apparatus according to the present invention includes a first heating means for locally heating the tubular member in the circumferential direction;
A drawing means for drawing out in a longitudinal direction the tubular member that is locally heated in the circumferential direction;
It comprises.
The first heating means irradiates, for example, a heating laser locally in the circumferential direction of the tubular member.

  You may comprise the 2nd heating means which heats another part in the longitudinal direction from the part heated with the said 1st heating means among the said tubular members.

  According to the present invention, since the tubular member is locally heated in the circumferential direction at the time of drawing, the tubular member can be thinned while deforming the cross-sectional shape without using a die.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1A is a cross-sectional view for explaining a method of processing a tubular member according to the first embodiment of the present invention. This figure has shown the cross section of the longitudinal direction of a tubular member. 1B is a cross-sectional view taken along the line AA ′ in FIG. 1A, and FIG. 1C is a cross-sectional view taken along the line BB ′ in FIG.

The processing method of the tubular member shown in these drawings is that the tubular member 10 is locally heated in the circumferential direction by irradiating a part of the tubular member 10 in the longitudinal direction with a laser locally in the circumferential direction. This is a method of manufacturing a tubular member 11 having a narrower tube than the tubular member 10 without a die by drawing the tubular member 10 in a state. The local heating temperature of the tubular member 10 varies depending on the material of the tubular member 10, but is preferably equal to or higher than a temperature that can provide a necessary deformation resistance difference in the circumferential direction of the tubular member 10. The drawing speed V ₁ of the tubular member 11 is faster than the supply speed V ₂ of the tubular member 10.

  Since the tubular member 10 is locally heated in the circumferential direction at the time of drawing, a difference in deformation resistance is given to the tubular member 10 in the circumferential direction, and the sectional shape of the tubular member 11 is different from the sectional shape of the tubular member 10. become. In the example shown in this figure, the tubular member 10 is irradiated with laser at four locations spaced apart by 90 ° in the circumferential direction, and the cylindrical tubular member 10 is turned into the tubular member 11 having a hollow square cross-sectional shape. Pulled out. In addition, the case where the circular part remains in a corner | angular part is also included in the square here. Applications of the tubular member 11 include painless injection needles, MEMS parts, μ-TAS parts, micro heat exchangers, electrode tubes for electric discharge machining, micro nozzles, nozzles, headrests, laser accelerators, and the like.

  The atmosphere located around the portion where the tubular member 10 is heated by the laser is cooled using a cooling means (for example, a cooler). Thereby, it can suppress that the temperature of the area | region located between the parts heated among the tubular members 10 rises.

It should be noted that the time from when the processing of the tubular member 10 is started until the pulling speed of the tubular member 11 and the supply speed of the tubular member 10 are set to V ₁ and V ₂ , which are steady states, is preferably longer to some extent. Thereby, it can suppress that the cross-sectional shape of the tubular member 11 becomes unstable immediately after the drawing start. Further, the smaller the crystal grain of the tubular member 10, the smaller the surface roughness of the tubular member 11.

  FIG. 2 is a diagram illustrating an example of a laser irradiation system of a tubular member processing apparatus used in the tubular member processing method described with reference to FIG. The tubular processing apparatus shown in this figure has a moving means (not shown) for moving (pulling out) the tubular members 10 and 11 in the longitudinal direction, and a laser irradiation system shown in FIG. The laser irradiation system shown in FIG. 2 divides a laser emitted from one laser light source 20 into four lasers using three half mirrors 21, and the divided four lasers are a plurality of total reflection mirrors 22. 1 is used to irradiate the position shown in FIG.

  As described above, according to the present embodiment, since the tubular member 10 is locally heated in the circumferential direction at the time of drawing, the cross-sectional shape of the tubular member 11 formed by drawing is different from the cross-sectional shape of the tubular member 10. Can be.

  Incidentally, the laser irradiation system is not limited to the irradiation system shown in FIG. 2, and for example, four lasers irradiated from four laser light sources may be irradiated directly to the position shown in FIG. Good. In this case, it is preferable to control the output of each laser light source, the spot system, and the irradiation position using a control unit (not shown). For example, the laser irradiation position can be appropriately controlled by moving the laser light source, or by moving or changing the angle of the member constituting the optical system disposed between the laser light source and the tubular member 10. It can be moved.

  In addition, the shape of the tubular member 11 is not limited to the above-described shape, and when the tubular member 10 is heated at n places spaced apart from each other in the circumferential direction, the cross-sectional shape of the tubular member 11 is a hollow n-gon. However, n is a natural number. For example, as shown in FIG. 3 (A), when the tubular member 10 is heated at three locations that are spaced apart from each other in the circumferential direction, the cross-sectional shape of the tubular member 11 is hollow as shown in FIG. 3 (B). It becomes a triangle. Here, the n-gon shape includes a case where a circular portion remains in the corner portion.

  FIG. 4 is a cross-sectional view for explaining a method for processing a tubular member according to the second embodiment of the present invention. Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the processing method shown in this figure, the tubular member 10 is manufactured by drawing the tubular member 12 in a dieless manner while heating a part of the longitudinal direction of the tubular member 12 having a larger cross-sectional shape than the tubular member 10 over the entire circumference. Immediately thereafter, the tubular member 11 is manufactured by performing the processing method shown in the first embodiment. The supply speed V ₃ of the tubular member 12 is slower than the supply speed of the tubular member 10, that is, the drawing speed V ₂ .

  The tubular member processing apparatus used in the present embodiment has a configuration in which means for heating a part of the tubular member 12 over the entire circumference is added before the tubular member processing apparatus used in the first embodiment. A means for heating a part of the tubular member 12 over the entire circumference is an induction heating means using, for example, an induction heating coil 23 and a cooling means 24 (for example, a water cooling means or an air cooling means). In this case, the laser spot diameter may be increased.

According to this embodiment, since the tubular member 11 is manufactured by pulling out the tubular member 12 in two steps, the area reduction rate of the tubular member 11 with respect to the tubular member 12 can be increased. The removal speed V ₁ of the tubular member 11 can be increased. The number of drawing stages of the tubular member is not limited to two, but may be three or more. In this case, at least one drawing process is the drawing process described in the first embodiment.

  FIG. 5 is a cross-sectional view for explaining a method of processing a tubular member according to the third embodiment of the present invention. Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The processing method shown in the present embodiment is the first implementation except that the region located between the portions of the tubular member 10 heated by the laser is locally cooled using the cooling means 25. It is the same as the form. The cooling unit 25 has substantially the same configuration as the cooling unit 24 in the second embodiment, except that the cooling unit 25 is arranged not in the circumferential direction but in the longitudinal direction of the tubular member 10. In this embodiment, the atmosphere located around the portion where the tubular member 10 is heated by the laser need not be cooled.

  According to this embodiment, the same effect as that of the first embodiment can be obtained. Moreover, it suppresses that the temperature of the area | region located among the heated parts among the tubular members 10 suppresses, the cross-sectional shape of the tubular member 11 formed by drawing, and the cross-sectional shape of the tubular member 10 The difference can be further increased.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

(A) is sectional drawing for demonstrating the processing method of the tubular member which concerns on 1st Embodiment, (B) is AA 'sectional drawing of (A), (C) is BB of (A). 'Cross sectional view. The figure which shows an example of the laser irradiation system of the tubular member processing apparatus used for the processing method of the tubular member demonstrated using FIG. (A) And (B) is a figure for demonstrating the modification of 1st Embodiment. Sectional drawing for demonstrating the processing method of the tubular member which concerns on 2nd Embodiment. Sectional drawing for demonstrating the processing method of the tubular member which concerns on 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 11, 12 ... Tubular member, 20 ... Laser light source, 21 ... Half mirror, 22 ... Total reflection mirror, 23 ... Induction heating coil, 24, 25 ... Cooling means

Claims (7)

The heating member that locally heats the tubular member in the circumferential direction and pulls the tubular member at a pulling speed V1 while giving a deformation resistance difference in the circumferential direction, and the tubular member is heated by the heating member. in by being fed at a feed rate V2, the tubular member, and tubules of while deforming the cross-sectional shape, wherein a pulling speed V1 the feed speed V2 is in the processing method of the tubular member satisfy the relation of the following formula (1) There,
The tubular member before processing is cylindrical,
The tubular member is heated at n points spaced apart from each other in the circumferential direction during pulling,
The cross-sectional shape of the tubular member after pulling is a hollow n-gonal tubular member processing method (where n is a natural number). V2 <V1 (1)   The method of processing a tubular member according to claim 1, wherein the supplying is performed by fixing the heating means and moving the tubular member, or by moving the heating means in a direction opposite to a pulling direction. The method for processing a tubular member according to claim 1 or 2 , wherein the tubular member is pulled while cooling an atmosphere located around a portion of the tubular member that is locally heated in the circumferential direction. The tubular member according to any one of claims 1 to 3 , wherein the tubular member is pulled while the regions located between the regions that are locally heated among the tubular members are locally cooled. Processing method. First heating means for locally irradiating a heating laser in the circumferential direction of the tubular member to heat the tubular member;
Tension means for pulling the tubular member locally heated in the circumferential direction with respect to the first heating means in the longitudinal direction at a pulling speed V1;
Supply means for supplying the tubular member to the first heating means at a supply rate V2,
Comprising
A tubular member processing apparatus in which the pulling speed V1 and the supply speed V2 satisfy the relationship of the following formula (1).
V2 <V1 (1) The supply means fixes the first heating means and moves the tubular member, or
6. The tubular member processing apparatus according to claim 5 , wherein the first heating unit is a unit that moves the first heating unit in a direction opposite to a pulling direction. 7. The tubular member processing apparatus according to claim 5 , further comprising a second heating unit that heats a portion of the tubular member that is different from the portion heated by the first heating unit in a longitudinal direction.

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