JP2006026733A - Shaft-shaped parts having spherical head and method for manufacturing it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a necking part in the boundary part between a spherical head and a hollow shaft portion easily and accurately while making hollow shaft-shaped parts light in weight by manufacturing the hollow shaft-shaped parts having the spherical head portion from a pipe material. <P>SOLUTION: The shaft-shaped parts has the spherical head on which the spherical head 13 is integrally formed at one end of the shaft part 11 through a necking part 14 which is smaller in diameter than the shaft part 11, wherein the hollow shaft part 11 and the hollow spherical head 10 which is integrally formed at one end of the shaft part, are formed by heading by using a base stock A consisting of a pipe material, while the hollow necking part is formed in recess condition by form-rolling at boundary section between the spherical head 13 and the hollow shaft portion 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

    The present invention relates to a shaft-shaped component having a spherical head and a method of manufacturing the same, and more specifically, a constricted portion having a diameter smaller than that of the shaft portion at one end of the shaft portion, such as a ball stud used in a ball joint of an automobile. The present invention relates to a shaft-like component having a spherical head formed integrally with a spherical head and a method for manufacturing the same.

  Conventionally, a ball stud used for a ball joint has a spherical head supported in a socket, and a shaft portion protruding outward from an opening of the socket so as to be swingable. Further, in order to ensure a large swing angle of the ball stud shaft portion, the neck groove portion (constriction portion) having a smaller diameter than the shaft portion and the spherical head portion is usually provided between the ball stud shaft portion and the spherical shaft portion. ) Is formed.

And as a manufacturing method of this ball stud, a ball stud body having a shaft portion and a spherical head portion is formed by forging a solid material, and thereafter, the shaft portion of the ball stud body and the spherical shaft portion It is known that the neck groove portion is separately formed by cutting, or the neck groove portion as well as the shaft portion and the spherical head portion are formed in the forging process.
Japanese Patent Publication No. 6-38970

  By the way, since the ball stud formed by the ball stud manufacturing method described above forms a ball stud body by forging a solid material in all cases, the shaft portion, the head portion, and the neck groove portion are all inside. Actually, or at least the shaft portion and the neck groove portion are solid, so that there is a problem that the weight of the ball stud is inevitably increased. In addition, when the neck groove portion of the ball stud main body is formed by the above-described ball stud manufacturing method, if the neck groove portion is separately formed by cutting, consistent manufacturing cannot be performed by a forging molding machine, and the productivity is poor. There is a problem, and in the case of forming by forging, there is a problem that the shaft portion or the spherical head portion adjacent to the neck groove portion or the neck groove portion is deformed and the dimensional accuracy is deteriorated. That is, when forming a neck groove part by a drawing process between the shaft part and the spherical shaft part later, excess meat squeezed to form the neck groove part moves to the shaft part or the spherical shaft part, Deformation occurs in the shaft or spherical shaft, resulting in poor dimensional accuracy, and when the solid shaft is swelled in advance to form a solid shaft with a predetermined diameter by aligning with the minimum diameter of the neck groove. When the actual neck groove portion is formed at the same time, the neck groove portion is deformed, resulting in a problem that the dimensional accuracy is deteriorated.

  Accordingly, an object of the present invention is to manufacture a hollow shaft-shaped part having a spherical head from a pipe material, and to reduce the weight while easily and accurately forming a constriction at the boundary between the spherical head and the hollow shaft. An object of the present invention is to provide a shaft-like component having a spherical head that can be well formed and a method for manufacturing the same.

  In order to solve the above problem, the invention according to claim 1 of the present application has a spherical head in which a spherical head is integrally formed at one end of the shaft portion via a constricted portion having a smaller diameter than the shaft portion. A shaft-shaped component that uses a pipe material to form a hollow spherical head and a hollow spherical head integrally formed at one end thereof, while the spherical head and the hollow shaft It is characterized in that a hollow constricted portion is recessed by rolling at the boundary portion.

  Further, the invention according to claim 2 of the present application is to manufacture a shaft-shaped part having a spherical head in which a spherical head is integrally formed at one end of the shaft portion via a constricted portion having a smaller diameter than the shaft portion. As a method, first, a material made of a pipe material having the same outer diameter as that of the shaft portion is pushed into a die from one direction so that the hollow shaft portion and the tip portion thereof are integrally continuous and have the same thickness as the hollow shaft portion. Forming a primary intermediate material having a small-diameter shaft portion having a thickness, and then setting the base end side of the hollow shaft portion of the primary intermediate material with a punch having a spherical recess, Forming a secondary intermediate material that includes a hollow spherical head that communicates with the hollow shaft portion on the end side and has a wall thickness similar to that of the hollow shaft portion; and a spherical head of the secondary intermediate material; The boundary part with the hollow shaft part is rolled and the boundary part has the same thickness as the hollow shaft part. Wherein the constricted portion to form a recessed to become final molded article of.

  Further, the invention according to claim 2 of the present application is to manufacture a shaft-shaped part having a spherical head in which a spherical head is integrally formed at one end of the shaft portion via a constricted portion having a smaller diameter than the shaft portion. As a method, first, a material made of a pipe material having the same outer diameter as that of the shaft portion is pushed into a die from one direction so that the hollow shaft portion and the tip portion thereof are integrally continuous and have the same thickness as the hollow shaft portion. A primary intermediate material having a small-diameter shaft portion having a thickness is formed, and then a forming pin is pushed into the proximal end side of the hollow shaft portion of the primary intermediate material, and the tube is expanded to form a U-shaped cross section. And forming a secondary intermediate material having a head having the same thickness as the hollow shaft, and then inserting a sphere into the head of the secondary intermediate material, Rolling the boundary part with the hollow shaft part that follows, and holding the sphere with the same thickness as the hollow shaft part Provided with a spherical head, characterized in that the formation of the final molded article obtained by recessed hollow neck portion having a wall thickness comparable to the hollow shaft portion at the boundary portion.

  According to the above-described configuration, the shaft part of the shaft-like component having the spherical head part, the spherical head part, and the constricted part can be formed hollow to reduce the weight, and the boundary between the spherical head part and the hollow shaft part can be achieved. Since the constricted portion is recessed in the part by rolling, the hollow constricted portion having the same thickness as the hollow shaft portion is formed without deforming the spherical head portion and the hollow shaft portion. It can be formed easily and accurately. Therefore, the strength does not decrease at the constricted portion.

  According to the manufacturing method of the second aspect, a hollow spherical head is integrally formed at one end of a hollow shaft portion from a material made of a pipe material via a hollow constriction portion having a smaller diameter than the shaft portion. Since a hollow shaft-shaped part can be manufactured, the weight can be reduced, and the constricted portion is recessed by rolling at the boundary between the spherical head and the hollow shaft. A hollow constriction having the same thickness as the hollow shaft can be easily and accurately formed without deforming the hollow shaft. Therefore, the strength does not decrease at the constricted portion.

  Further, according to the manufacturing method of the third aspect, a hollow spherical head is integrally formed at one end of the hollow shaft portion from the pipe material through a hollow constriction portion having a smaller diameter than the shaft portion. A hollow shaft-shaped part can be manufactured, the weight can be reduced, and the head and the hollow shaft portion that follows the head are inserted into a sphere that is expanded in a U-shaped section. The boundary portion is rolled to provide a spherical head having a sphere with the same thickness as the hollow shaft portion, and a hollow constriction portion having the same thickness as the hollow shaft portion at the boundary portion. Since the final molded product formed by recessing is formed, the hollow constricted portion having the same thickness as the hollow shaft portion is formed without deforming the spherical head portion and the hollow shaft portion when forming the constricted portion. It can be formed easily and accurately. Therefore, the strength does not decrease at the constricted portion. In addition, when the spherical head is formed by rolling, for example, a spherical body such as rubber can be simultaneously provided in the spherical head to close the opening of the spherical head.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a ball stud 1 having a spherical head according to the present invention. The ball stud 1 is continuously formed integrally with a hollow shaft portion 11 and a distal end side of the hollow shaft portion 11 using a material made of a pipe material. In addition, a small-diameter shaft portion 12 having the same thickness as the hollow shaft portion 11 and a hollow spherical shape having the same thickness as the hollow shaft portion 11 integrally formed on the proximal end side of the hollow shaft portion 11. While the head 13 is formed by forging, a hollow constricted portion 14 having a thickness similar to that of the hollow shaft 11 is recessed by rolling at the boundary between the spherical head 13 and the hollow shaft 11. It is made up.

  According to the configuration described above, the shaft portion 11, the spherical head portion 13, and the constricted portion 14 of the ball stud 1 having the spherical head portion 13 can be all formed hollow to reduce the weight. Since the constricted portion 14 having the same thickness as the hollow shaft portion 11 is recessed by rolling at the boundary portion between the spherical head portion 11 and the hollow shaft portion 11, the spherical head portion 13 and the hollow shaft portion 11 are deformed. The hollow constricted portion 14 can be easily and accurately formed without giving. That is, when the constricted portion 14 is recessed by the rolling process, excess meat generated by the rolling process can freely move into the hollow interior, so that it does not move to the shaft portion 11 or the spherical shaft portion 13. As a result, the shaft portion or the spherical shaft portion is not deformed as in the prior art, and the dimensional accuracy is not deteriorated. Therefore, the strength does not decrease in the constricted portion 14.

  FIG. 2 shows an embodiment in which the ball stud 1 is manufactured.

  FIGS. 2-6 has shown the change in the formation process in the case of manufacturing the said ball stud 1 from a pipe material with a multistage forging molding machine. As shown in FIG. 2, when the pipe material is used as the material, a pipe material having the same diameter as the outer diameter of the hollow shaft portion 11 of the shaft-shaped part 1 whose outer diameter is required is used as the material A.

  First, in the first step, the material A is pressed into a die (not shown) from one direction to perform drawing. As a result, as shown in FIG. 3, the first material (primary intermediate) including the hollow shaft portion B1 and the small-diameter shaft portion B2 that is continuous with the tip portion of the hollow shaft portion B1 and has the same thickness as the hollow shaft portion B1. Material) B is formed.

  Next, in the second step, a forming pin (not shown) is pushed into the proximal end side of the hollow shaft portion B1 of the first intermediate material B and is upset. As a result, as shown in FIG. 4, the base material side of the hollow shaft portion C1 is expanded in a U-shaped cross section, and the second material C including the head C3 having the same thickness as the hollow shaft portion C1 is formed. It is formed.

  Thereafter, in the third step, the base end side of the hollow shaft portion C1 of the second material C is upset by a punch (not shown) having a spherical recess. As a result, as shown in FIG. 5, the hollow shaft portion D1 is provided with a hollow spherical head portion D3 that communicates with the hollow shaft portion D1 on the proximal end side of the hollow shaft portion D1 and has the same thickness as the hollow shaft portion D1. Three materials (secondary intermediate materials) D are formed.

  Further, in the fourth step, the boundary portion between the spherical head D3 and the hollow shaft portion D1 of the third material D is rolled. As a result, as shown in FIG. 6, as a final molded product in which a hollow constricted portion 14 having a thickness similar to that of the hollow shaft portion 11 is recessed at the boundary portion between the spherical head portion 13 and the hollow shaft portion 11. A ball stud 1 is formed. At this time, only the boundary portion between the hollow spherical head portion 13 and the hollow shaft portion 11 is pushed inward by the rolling process to form the hollow constricted portion 14, so that the spherical head portion 13 and the hollow shaft portion are formed. The hollow constricted portion 14 can be easily and accurately formed without giving deformation to 11. That is, when the constricted portion 14 is recessed by the rolling process, excess meat generated by the rolling process can freely move into the hollow interior, so that it does not move to the shaft portion 11 or the spherical shaft portion 13. In addition, the wall thickness can be kept uniform. As a result, the shaft portion or the spherical shaft portion is not deformed as in the prior art, and the overall dimensional accuracy is not deteriorated. In addition, when trying to form the constricted part by cutting, the thickness of the constricted part becomes thinner than the thickness of the other part, so that a problem that the strength is lowered occurs and it cannot be adopted.

  As described above, when the ball stud 1 having the spherical head 13 is manufactured by the manufacturing method of the present invention, the cut material A made of the pipe material has a smaller diameter than the shaft portion 11 at one end of the hollow shaft portion 11. The hollow ball stud 1 in which the hollow spherical head 13 is integrally formed through the hollow constricted portion 14 can be manufactured, and the weight can be reduced. In addition, since the constricted portion 14 is recessed by rolling at the boundary portion between the spherical head portion 13 and the hollow shaft portion 11, the hollow shaft can be formed without deforming the spherical head portion 13 and the hollow shaft portion 11. The hollow constricted portion 14 having the same thickness as the portion 11 can be easily and accurately formed. Therefore, the strength does not decrease at the constricted portion.

  In addition, when the spherical head 13 is formed by forging, an opening hole a may remain at the top of the spherical head 13 depending on the material, the diameter of the spherical head 13 or the width of the wall thickness, What is necessary is just to close the opening hole a as needed, such as fitting a closing plug or a lid.

  FIG. 7 shows the boundary between the spherical head D3 of the third material D and the hollow shaft portion D1 in the fourth step of the embodiment described above as a specific means for closing the opening hole a of the spherical head D3. When the constricted portion 14 is recessed by rolling the portion, the flat head bolt 2 is inserted into the hollow shaft portion D1 from the opening a of the spherical head D3, and at the same time the constricted portion 14 is recessed. The tip 21 of the countersunk bolt 2 is caulked with the constricted part 14, and the opening a of the spherical head 13 is finally closed. In this case, in the third step, the diameter of the opening hole a in the spherical head D3 of the third material D is formed to remain slightly larger than that of the previous embodiment, while in the fourth step, the constricted portion When the concave portion 14 is provided, a slightly wide constricted portion 14 is formed so as to enhance the closing property by the head portion 22 of the flat bolt 2 and the caulking effect by the constricted portion 14.

  FIG. 8 shows a boundary portion between the spherical head D3 of the third material D and the hollow shaft portion D1 in the fourth step of the embodiment described above as another means for closing the opening a of the spherical head D3. When the constricted portion 14 is recessed by rolling, the closing pin 3 is inserted into the hollow shaft portion D1 from the opening a of the spherical head D3, and the constricted portion 14 is recessed while maintaining the insertion state. At the same time, the tip portion 31 of the closing pin 3 is caulked with the constricted portion 14 so as to close the opening a of the spherical head D3. Also in this case, in the third step, the diameter of the opening hole a in the spherical head D3 of the third material D is formed so as to remain slightly larger than that of the previous embodiment, while the fourth step In the case where the constricted portion 14 is recessed, a slightly wider constricted portion 14 is formed so as to enhance the insertability by the closing pin 3 and the caulking effect by the constricted portion 14.

  In the embodiment shown in FIGS. 7 and 8, the flat bolt 2 or the closing pin 3 is inserted in advance into the hollow shaft D1 from the opening a of the spherical head D3 in the fourth step. Although the countersunk bolt 2 or the closing pin 3 is caulked with the constricted part 14 at the same time as the constriction of the constricted part 14 by rolling, for example, in the fourth step, the countersunk bolt 2 or the closing pin 3 is used. Is not inserted into the third material D3, and the spherical head 13 and the constricted portion 14 as shown in the embodiment of FIG. 7 or FIG. 8 described above are formed by rolling or forging. As a process, a pin having a knurled or serrated tip or the like, or a bolt-shaped member having a knurled or serrated or the like instead of the tip screw portion of a countersunk bolt is inserted into the spherical head 13 from the opening a. It fitted fixedly in the shaft portion 11 may be close the opening.

  9 and 10 show another embodiment for manufacturing a ball stud.

  Also in this case, the process up to the second step is exactly the same as in the embodiment described above, and the second material C is formed in the same manufacturing process using the pipe material.

  And in a 3rd process, as shown in FIG. 9, the rubber-made spherical body 4 is inserted in the head C3 of the 2nd raw material C, and the head C3 and the hollow shaft part C1 following this are maintained with the state maintained. As shown in FIG. 10, the boundary portion is provided with a spherical head portion 13 'holding the sphere 4 with the same thickness as the hollow shaft portion 11', and the spherical head portion 13 'is hollow. A ball stud 1 ′ is formed as a final molded product having a hollow constricted portion 14 ′ having a thickness similar to that of the hollow shaft portion 11 ′ at the boundary with the shaft portion 11 ′. At this time, the head portion C3 and the subsequent boundary portion C4 between the hollow shaft portion C1 are pushed inward by rolling, and the spherical head portion 13 'holding the sphere 4 and the hollow constricted portion 14' Therefore, the hollow constricted portion 14 'can be formed with high accuracy without deforming the spherical head portion 13' and the hollow shaft portion 11 '. Of course, the sphere 4 is not limited to rubber and may be a sphere of iron, aluminum, resin, or the like.

  Even when the ball stud 1 ′ having the spherical head portion 13 ′ is manufactured by the above manufacturing method, a hollow constriction having a smaller diameter than the shaft portion 11 ′ is formed from the cutting material A made of pipe material to one end of the hollow shaft portion 11 ′. A hollow ball stud 1 ′ in which a hollow spherical head 13 ′ is integrally formed through the portion 14 ′ can be manufactured, and the weight can be reduced. In addition, by rolling the boundary portion C4 between the head C3 and the hollow shaft portion C1 following the spherical body 4 inserted into the head C3 having a U-shaped expanded tube, the hollow shaft portion A spherical head 13 'having a thickness similar to that of C1 and holding the sphere 4 is provided, and a hollow constricted portion 14' having a thickness similar to that of the hollow shaft portion 11 'is provided in the boundary portion. Since the final molded product is formed, the spherical head portion 13 ′ and the hollow shaft portion 11 ′ are not deformed at the time of forming the constricted portion 14 ′, and have the same thickness as the hollow shaft portion 11 ′. The hollow constricted portion 14 'can be easily and accurately formed. Accordingly, there is no occurrence of a decrease in strength at the constricted portion 14 '. In addition, when the spherical head portion 13 ′ is formed by rolling, the opening a of the spherical head portion 13 ′ can be closed by simultaneously placing the spherical body 4 such as rubber in the head portion.

  In the above-described embodiment, the small-diameter shaft portion need not be particularly formed. When forming the small-diameter shaft portion, for example, a tooth portion may be formed on the small-diameter shaft portion, or a small-diameter hollow shaft portion may be formed by a tip portion of the small-diameter shaft portion.

  In the above-described embodiment, the ball stud has been described. However, the ball stud is not limited to the ball stud. For example, a screw part having a spherical head or a toothed shaft having a spherical head and its manufacture. Of course, the method can be widely applied.

  It is a partially cutaway front view of the ball stud concerning the present invention.   It is a longitudinal cross-sectional view of the pipe raw material in the manufacturing process of the shaft-shaped component manufactured with the manufacturing method which concerns on this invention.   It is a longitudinal cross-sectional view of the 1st raw material formed at the 1st process.   It is a longitudinal cross-sectional view of the 2nd raw material formed at the 2nd process.   It is a longitudinal cross-sectional view of the 3rd raw material formed at the 3rd process.   It is a longitudinal cross-sectional view of the final molded product formed in the fourth step.   It is a longitudinal cross-sectional view of the final molded product formed at the 4th process of another embodiment.   It is a longitudinal section of the final formed product formed in the fourth step of another embodiment.   It is a longitudinal cross-sectional view of the 2nd raw material which shows the preparation state of the 3rd process in another manufacturing method.   It is a longitudinal cross-sectional view of the last shaft-shaped component formed at the 3rd process.

Explanation of symbols

1 Ball stud (shaft-shaped part)
1 'Ball stud (shaft-shaped part)
11 hollow shaft portion 11 'hollow shaft portion 12 small diameter shaft portion 12' small diameter shaft portion 13 spherical head 13 'spherical head 14 constricted portion 14' constricted portion A material B first material (primary intermediate material)
B1 Hollow shaft portion B2 Small diameter shaft portion B3 Spherical head portion B4 Constricted portion C Second material C1 Hollow shaft portion C2 Small diameter shaft portion C3 Spherical head portion C4 Constricted portion D Third material (secondary intermediate material)
D1 Hollow shaft D2 Small diameter shaft D3 Spherical head D4 Constriction

Claims (3)

  A shaft-shaped component having a spherical head formed integrally with a spherical head at one end of the shaft portion via a constricted portion having a smaller diameter than the shaft portion, and using a material made of a pipe material, a hollow shaft A hollow spherical head formed integrally with one part and one end thereof is formed, while a hollow constricted part is recessed by rolling at the boundary between the spherical head and the hollow shaft part. A shaft-shaped component having a spherical head.   A method for manufacturing a shaft-shaped component having a spherical head formed integrally with a spherical head at one end of a shaft portion through a constricted portion having a diameter smaller than that of the shaft portion. A material made of a pipe material having an outer diameter is pushed into a die from one direction, and includes a hollow shaft portion and a small-diameter shaft portion that is continuous with the tip portion of the hollow shaft portion and has the same thickness as the hollow shaft portion. Forming a primary intermediate material, then upsetting the base end side of the hollow shaft portion of the primary intermediate material with a punch having a spherical recess, and communicating with the hollow shaft portion on the base end side of the hollow shaft portion; and Forms a secondary intermediate material with a hollow spherical head having the same thickness as the hollow shaft, and rolls the boundary between the spherical head of the secondary intermediate material and the hollow shaft. Finally, a hollow constricted portion having a thickness similar to that of the hollow shaft portion is recessed in the boundary portion. The shaft-like component manufacturing method with a spherical head, characterized in that the formation of the.   A method for manufacturing a shaft-shaped component having a spherical head formed integrally with a spherical head at one end of a shaft portion through a constricted portion having a diameter smaller than that of the shaft portion. A material made of a pipe material having an outer diameter is pushed into a die from one direction, and includes a hollow shaft portion and a small-diameter shaft portion that is continuous with the tip portion of the hollow shaft portion and has the same thickness as the hollow shaft portion. Form a primary intermediate material, and then push a molding pin into the proximal end side of the hollow shaft portion of the primary intermediate material and install it to expand the tube into a U-shaped cross section, and the same size as the hollow shaft portion Forming a secondary intermediate material with a thick head, and then rolling the boundary between the head and the hollow shaft, with the sphere inserted into the head of the secondary intermediate material Processed and equipped with a spherical head that has a sphere with the same thickness as the hollow shaft, and has a boundary. The shaft-like component manufacturing method with a spherical head, characterized in that the formation of the final molded article obtained by recessed hollow neck portion having a wall thickness comparable to the hollow shaft portion.

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