JP3685958B2 - Nut molding method and molding apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a molding method and a molding apparatus for metal products, particularly nuts.
[0002]
[Prior art]
Conventionally, as shown in FIG. 5, the nut has a problem that wrinkles are generated in the portion A because the material is inflated while pushing down the lower mold in the first step.
In the second step, the lower mold used in the first step cannot be used, and there is a problem that the semi-finished product must be turned upside down when transported to the second step.
Therefore, there are problems that the number of processes is large, time is required, and the price is increased.
Further, even in the first half of the first step, when a space was previously provided in the lower mold, there was a problem that the material first inflated at the R portion of the lower mold and the A portion did not swell as shown in FIG. .
[0003]
[Problems to be solved by the invention]
The invention of the present application solves such problems of the prior art, is finished well, and can be manufactured in a short time at a low cost with a metal product, preferably a metal product having a flange, particularly preferably a nut molding method and molding apparatus. The purpose is to provide.
[0004]
[Means for Solving the Problems]
The claimed invention is in the upper mold having a space which extends below the bottom, and pressed with a pin inserted metal rods into the upper mold from above, by pressing on pin of the upper mold while controlling the lower die pins The present invention relates to a metal product molding method and a molding apparatus in which a lower portion of a metal rod is expanded, by pressing down to generate a space in a lower mold and expanding the diameter of the metal rod.
[0005]
[Action]
According to this invention, it is possible to produce a metal product with a clean finish, preferably with a flange, particularly preferably a nut, in a short process and at low cost.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The expanded space of the upper mold is preferably tapered, and the space in the lower mold is particularly preferably provided by pushing down the lower mold pin whose movement is controlled.
[0007]
The lower mold pin is particularly preferably controlled by a pressing device. The lower mold pin is pressed to suppress the downward movement of the pin, and the lower mold pin is pressed by the upper mold pin (molding load). It is particularly preferable to generate a space in the lower mold by lowering the height.
After molding, it is particularly preferable to release the control of the lower pin so that the pin can be moved upward.
[0008]
The lower mold pin preferably has a convex portion on the upper surface of the pin.
[0009]
In addition, it is particularly preferable to mold the upper part of the metal material into the flange by changing the upper mold and pressing the upper part of the metal product whose diameter of the lower part of the metal bar is increased with a pin.
[0010]
The metal product having a flange is particularly preferably provided with a recess by changing the lower mold and pressing the lower part of the metal product against the pin of the lower mold.
The lower die is particularly preferably provided with a die cushion.
It is particularly preferable that the metal product having the recess is tubular by penetrating the recess by changing the upper mold and further pressing with a pin.
The lower die is particularly preferably provided with a die cushion.
The tubular metal product having a flange is particularly preferably a through nut.
[0013]
The invention of the present application also relates to a molding apparatus, and in particular, a lower mold pin is pressed by a pressing apparatus to control the downward movement of the pin, and the lower mold pin is lowered by a molding load to lower the lower mold. The present invention relates to a molding apparatus or the like that generates a space in the interior and releases the pressing of the pressing device after the molding so that the pin can be moved upward.
[0014]
Hereinafter, the present invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing the movement of the mold in the first half of the first step of the present invention. FIG. 2 is a schematic cross-sectional view showing the movement of the mold in the second half of the first step of the present invention. Yes, FIG. 3 is a schematic cross-sectional view showing the movement of the mold in the second step of the present invention. FIG. 4 is a schematic cross-sectional view showing the movement of the mold in the third step of the present invention. FIG. 5 is a schematic cross-sectional view showing the movement of the mold in the conventional first step, FIG. 6 is a schematic cross-sectional view showing the former half of the conventional first step, and FIG. FIG. 8 is a sectional view showing the movement of the molding device in the first half of the first step of the invention, FIG. 8 is a sectional view showing the movement of the molding device in the second half of the first step of the invention of this application, and FIG. FIG. 10 is a sectional view showing the movement of the molding device in the second step of the invention, and FIG. 10 is a sectional view showing the movement of the molding device in the third step of the invention of this application. A.
7 to 10, the left side of the XX line shows a state before molding, and the right side of the XX line shows a state after molding.
[0015]
The molding process will be specifically described with reference to FIGS.
Although not shown, a metal rod is cut into a predetermined length to produce a metal rod.
First half of the first step In the first half of the first step shown in FIG. 1, the lower die controlled by pressing (molding load) of the upper die 3 by inserting the metal rod 1 into the upper die 2 having the space 4 in the lower part. The pin 6 is pushed down to generate a space 7 in the lower mold, and the metal rod 1 is expanded and expanded in the space 7.
As shown in FIG. 2 in the second half of the first step, the lower part of the metal bar 1 manufactured in FIG. 1 is pressed with a pin 3 by another upper mold 2 and the upper part of the metal bar 1 is flanged 8. To mold.
Second Step As shown in FIG. 3, the metal rod 1 formed in the first step and having a flange having an enlarged diameter at the lower portion is conveyed to another lower mold, and the metal rod is pressed by a pin and pressed. A recess 9 is formed in
3rd process As shown in FIG. 4, the metal rod which has the flange 8 shape | molded by the 2nd process, and has the recessed part 9 is mounted, and another upper type | mold is mounted and pressed, and the through-hole 11 is shape | molded.
[0016]
The apparatus of the present invention will be specifically described with reference to FIGS.
FIG. 7 is a schematic cross-sectional view showing the movement of the apparatus that performs the first half of the first step of the present invention. FIG. 8 is a schematic cross-sectional view showing the movement of the apparatus that performs the second half of the first step of the present invention. FIG. 9 is a schematic cross-sectional view showing the movement of the apparatus for performing the second step of the present invention, and FIG. 10 is a schematic cross-sectional view showing the movement of the apparatus for performing the third step of the present invention.
[0017]
In FIG. 7, reference numeral 1 denotes a metal rod, which is inserted into the upper mold 2. The upper mold 2 has a space 4 that expands in a tapered shape at the bottom, and a pin 3 for pressing from above is a metal. It is placed on the rod 1.
The lower mold 4 is disposed below the upper mold 2, and pins 6 are disposed on the lower mold.
The movement of the pin 6 of the lower mold is controlled by a pressing device 12 from the side. The pin 6 is lowered downward in conjunction with the movement of the pin 3 for pressing from above, and the lower mold space (the space of FIG. 1). 7) can be formed.
As shown on the left side, the metal rod 1 is inserted into the upper die 2 having a space 4 that expands in a tapered shape while the downward movement of the pin 6 is suppressed by the pressing device 12. As shown on the right side, the lower portion of the metal rod 1 is expanded by pressing with a pin 3 provided inside the upper mold 2.
[0018]
In FIG. 8, reference numeral 1 denotes a metal rod having an enlarged diameter at the bottom, which is inserted into the lower mold 5, and the upper mold 2 is placed on the lower mold 5. The lower part of this is expanded so as to form a flange, and a pin 3 for pressing from the upper part is arranged on the metal rod 1.
As shown on the left side, reference numeral 1 denotes a metal rod having an enlarged diameter at the bottom, which is inserted into the lower die 5 and, as shown on the right side, is pressed by the pin 3 of the upper die 2 different from that shown in FIG. Form a flange on top of 1.
[0019]
In FIG. 9, the metal rod 1 whose lower diameter is enlarged and the flange is molded is inserted into the upper mold 2 and the lower mold 5 having a die cushion 13 different from that in FIG. 8.
By pressing the pin 3, the concave portion 9 is formed in the metal rod 1.
The metal rod 1 on the left side shows a state in which the bottom after molding is completed in FIG. 8 has an enlarged diameter, has a flange and a recess, and is transported, inserted, and pressed into the lower die 5 while being inserted into the upper die 2. .
The right side shows a state in which the molding of the concave portion 9 is completed at the same time as the insertion is completed because the pin 6 for molding the concave portion on the metal rod is disposed below the metal rod 1 in the lower mold 5.
[0020]
In FIG. 10, reference numeral 1 denotes a metal rod having a lower diameter and a flange and a recess, and is inserted into a lower mold 5 having an upper mold 2 and a die cushion 13 different from those in FIG.
By pressing the upper mold 2, the through hole 11 is formed in the metal rod 1.
As shown on the left side, reference numeral 1 denotes a metal rod having a lower diameter and a flange and a recess, which is in contact with an upper mold 2 on which a through hole can be molded, and is inserted into the lower mold 5. The state where the pin 6 is arranged is shown.
As shown on the right side, when the upper mold 2 is pressed, the through hole 11 is formed in the metal rod 1 having a flange.
[0021]
【The invention's effect】
By this invention, the molding process, particularly the first molding process can be shortened, and the space can be formed by the upper mold pins while controlling the movement of the lower mold pins, so the surface can be molded cleanly, Metal products with good finishes, preferably metal products having flanges, particularly preferably through nuts can be mass-produced at low cost.
In the first step, only the upper mold can be changed and molded, and there is no need to take out the product from the lower mold, so the molding process can be omitted, the molding can be performed efficiently, Especially through nuts can be mass-produced at low cost.
[Explanation of symbols]
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing the movement of a mold in the first half of the first step of the present invention.
FIG. 2 is a schematic sectional view showing the movement of the mold in the latter half of the first step of the invention of this application.
FIG. 3 is a schematic cross-sectional view showing the movement of the mold in the second step of the present invention.
FIG. 4 is a schematic sectional view showing the movement of a mold in a third step of the invention of this application.
FIG. 5 is a schematic sectional view showing the movement of a mold in a conventional first step.
FIG. 6 is a schematic cross-sectional view showing a molding state in the first half of a conventional first step.
FIG. 7 is a schematic cross-sectional view showing the movement of the molding apparatus in the first half of the first step of the present invention.
FIG. 8 is a schematic cross-sectional view showing the movement of the molding apparatus in the latter half of the first step of the present invention.
FIG. 9 is a schematic cross-sectional view showing the movement of the molding apparatus in the second step of the present invention.
FIG. 10 is a schematic cross-sectional view showing the movement of the molding apparatus in the third step of the invention of this application.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Metal rod 2 Upper die 3 Upper die pin 4 Upper die space 5 Lower die 6 Lower die pin 7 Lower die space 8 Flange 9 Recess 10 Pin convex portion 11 Through hole 12 Lower die pin pressing device 13 Die cushion

Claims (10)

  In the upper mold that has a space that extends downward, press the metal rod inserted in the upper mold with a pin from above, and press down with the upper mold pin while controlling the lower mold pin. A method for forming a metal product in which the lower portion of the metal rod is expanded, wherein a space is generated in the metal rod and the diameter of the metal rod is expanded.   The method for molding a metal product having a diameter expanded at a lower part of the metal bar according to claim 1, wherein the space extending downward is tapered. 3. The method for molding a metal product with a lower diameter of the metal bar according to claim 1 or 2, wherein the lower pin is controlled by a pressing device . The lower mold pin has a convex part on the upper surface, The molding method of the metal product which the lower part of the metal bar in any one of Claims 1-3 expanded. The diameter of a lower mold | type is larger than the diameter of the lower end of an upper mold | type, The shaping | molding method of the metal product which the lower part of the metal bar in any one of Claims 1-4 expanded. The upper part of the metal product formed by expanding the diameter of the lower part of the metal bar molded according to any one of claims 1 to 5 is pressed by another upper mold pin, and the upper part of the metal material is molded into a flange. A method for molding a metal product having a flange and an enlarged diameter portion.   A lower part of a metal product having a flange and an enlarged diameter part molded according to claim 6 is pressed against another lower mold pin by an upper mold pin to form a concave part. A method for forming a metal product having a recess. A method for molding a metal product, wherein the through hole is molded by pressing the inside of the metal product molded according to any one of claims 1 to 7 with another upper mold pin.   The method for molding a metal product having a recess or a through hole according to claim 7 or 8, wherein the lower mold has a die cushion. The metal product molding method according to claim 1, wherein the metal product is a through nut.

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