JP2007090372A - Spinning machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spinning machine which can carry out plastic working without causing burrs at a groove portion to be formed on the external peripheral surface of an opening side end portion. <P>SOLUTION: In the spinning machine composed of a main spindle 2 having a chuck 21 for gripping the external peripheral surface of a cylindrical blank material W with a bottom, and pressing rollers having a stepped projection "a" for forming the groove portion on the end portion of the blank material W, the pressing rollers are composed of a first process pressing roller R1 connecting a large diameter peripheral surface portion a1 with a small diameter peripheral surface portion a2 of the stepped projection "a" by a tapered surface K, and a second process pressing roller R2 for forming a final shape. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a spinning machine that performs plastic working on an opening-side end portion of a bottomed cylindrical material, and in particular, a spinning machine that can process a product in which an inner diameter of an opening-side end portion is smaller than an inner diameter of a material body portion. It is about.

  2. Description of the Related Art Conventionally, as a spinning machine, one that is used in a plastic working method of a product (for example, a brake piston for a disc brake) in which a groove portion is plastically processed on an outer peripheral surface and the inner diameter is uniform has been proposed (for example, Patent Document 1). reference).

By the way, as shown in FIG. 5, the spinning machine 50 used in this plastic working method includes a squeeze roller 52, a pressing roller 53, a rotary mold 54, and a pressing mold 55 as main components.
In this spinning machine 50, the disk-shaped material 51 is disposed on the rotary mold 54 and is pressed and fixed by the presser mold 55, so that the disk-shaped material 51 is sandwiched between the rotary mold 54 and the presser mold 55. While rotating, the squeezing roller 52 is brought into contact to form a bottomed cylindrical semi-finished material 51a. Next, the pressing roller 53 is pressed against the peripheral surface of the semi-finished material 51a to complete the brake piston 51b in which the groove 51c is formed on the outer peripheral surface of the end.

However, the brake piston formed by the spinning machine 50 has a problem in terms of strength because the thickness n2 of the groove formed by plastic working is thin on the outer peripheral surface of the end portion on the opening side of the material. When it is necessary to make the inner diameter of the side end portion smaller than the inner diameter of the body portion, there is a problem that the spinning machine 50 cannot be used for molding.
In addition, although manufacture of the above products can be performed by cutting a bottomed cylindrical material by cutting without using a spinning machine, in this case, in order to reduce the amount of cutting Had a problem that the material shape had to be complicated.

  Further, the spinning machine 1 previously proposed by the present applicant as Japanese Patent Application No. 2004-361247 has a chuck 21 that holds the material W at the tip of the main shaft 2 connected to the rotating mechanism 6 as shown in FIGS. The mandrel 3 having the same axial center is disposed at a position facing the chuck 21, and a plastic processing of a desired concavo-convex shape on the outer peripheral surface of the end portion of the material W is provided at the tip of the holder 4. A pressing roller R4 having a concavo-convex portion for applying is attached rotatably. The holder 4 is configured to move in a direction perpendicular to the axis of the main shaft 2 (in the direction of the arrow Y2) and in the direction of the arrow P by a control signal from a control device (not shown) (see FIG. 8B). ).

  In the spinning machine 1, a regulation roller R <b> 3 that regulates the end surface of the end of the material W is attached to the tip of the holder 5 so as to be rotatable. This regulating roller R3 is attached to the holder 5 in order to adjust the distance between the main shaft 2 and the axial direction of the main shaft 2 (arrow X direction) by a control signal from a control device (not shown). It moves in the direction perpendicular to the core (arrow Y direction) (see FIG. 8A).

The chuck 21 is configured so that it can be removed from the main shaft 2 together with the clamping member 22 and the regulating member 23 and replaced with the chuck 21 corresponding to the product shape (material W).
The mandrel 3 has a cylindrical shape in which the axial center is the same as that of the main shaft 2 and is smaller than the inner diameter of the body portion of the material W. The material W pressed in the axial direction by the pressing roller R4 comes into contact with the peripheral surface of the mandrel 3 and the roller surface of the regulating roller R3.
Similarly to the chuck 21, the mandrel 3 is also mounted at the tip of the driven mechanism 7 that can move in the axial direction of the main shaft 2 according to the product shape (inner diameter of the material W, inner diameter of the processed product end). Attaching to 71 is possible.

Thus, the mandrel 3 is made to enter the material W fixed by the chuck 21 with a gap d3 from the inner peripheral surface of the material W, and the regulating roller R3 is made to face the end surface of the material W. The distance is shifted to the distance d4 (arrow X direction) (see FIG. 8A). The values of the gaps d3 and d4 are determined by calculating the end flow caused by plastic working.
Further, the regulating roller R3 is plastically processed while generating a thickness flow so as to increase the thickness of the end portion by pressing toward the mandrel side (arrow X direction) in the axial direction where the gap d4 becomes small. The wall thickness n1 of the final product can be sufficiently secured.

  Next, the pressing roller R4 is pressed in the direction of the arrow Y2, and the end portion of the material W comes into contact with the uneven shape of the pressing roller R4, the peripheral surface of the mandrel 3 and the regulating roller R3, and is subjected to plastic working, and the inner diameter of the end portion Is smaller than the inner diameter of the body portion of the material W, and the outer peripheral surface thereof is subjected to plastic working into a desired uneven shape.

However, in this case, the pressure roller is formed on the wall surface of the concave and convex groove portion on the outer peripheral surface when the large-diameter peripheral surface portion a1 of the stepped convex portion a of the pressing roller R4 bites into the material W while performing the groove processing. As R4 enters, the meat at the contact portion of the pressure roller R4 moves to both sides of the groove simultaneously with the diameter reduction. The moved meat is further pulled by the meat on both sides, separated from the side surface of the pressing roller R4, and the groove side surface becomes tapered. At this time, as shown in FIG. 9 (d), the excess meat has a large portion b1 on the outer diameter side of both sides of the groove (only the material end face side is shown in the figure), and further pressing of the pressing roller R4 proceeds. As a result, it is pressed against the small-diameter peripheral surface portion a2 of the stepped convex portion a, and as a result, as shown in FIG. .
JP 2002-70902 A

  In view of the problems of the conventional spinning machine, it is an object of the present invention to provide a spinning machine capable of plastic working without causing overturning in a groove formed on an outer peripheral surface of an opening side end. .

  In order to achieve the above object, a spinning machine of the present invention includes a main shaft provided with a chuck for sandwiching the outer peripheral surface of a bottomed cylindrical material, and a pressing roller having a stepped protrusion that forms a groove at the end of the material. In this spinning machine, the pressing roller includes a first step pressing roller in which the large diameter peripheral surface portion and the small diameter peripheral surface portion of the stepped convex portion are connected by an inclined surface, and a second step pressing roller that is formed into a final shape. It is characterized by that.

  According to the spinning machine of the present invention, the pressing roller is formed so as to reduce the excessive amount of the material that causes the turn-up by the first step pressing roller in which the convex portion of the pressing roller is the inclined surface on the material end surface side. Then, since the second process roller for forming into the final shape is used for forming, it is possible to carry out plastic working without causing a turn-up portion in the groove portion of the final shape.

  Hereinafter, embodiments of the spinning machine of the present invention will be described with reference to the drawings.

1 to 2 show a first embodiment of a spinning machine of the present invention.
This spinning machine 1 has the same configuration as the spinning machine 10 previously proposed by the present applicant as Japanese Patent Application No. 2004-361247 except that the shape of the pressure roller is different. Reference numerals are assigned and description is omitted.

  The pressing roller of the spinning machine 1 of the present invention includes a first process pressing roller R1 and a second process pressing roller R2. The first step pressing roller R1 is configured so that the large-diameter circumferential surface portion a1 and the small-diameter circumferential surface portion a2 that form the stepped convex portion a that forms a groove portion at the end portion of the material W are connected by the inclined surface K. The process pressing roller R2 is a pressing roller having no inclined surface so as to be formed into a final shape. The process pressing roller R2 is switched from the first process pressing roller R1 to the second process pressing roller R2 to form a groove at the end of the material. Plastic working is performed so that the inner diameter of the material end is smaller than the inner diameter of the material barrel.

As shown in FIG. 1, the inclined surface K of the first step pressing roller R1 is preferably inclined at an inclination angle θ of 30 to 60 degrees, preferably 45 degrees. It is molded so as to have a shape that does not.
And 2nd process press roller R2 makes the shape which does not have the inclined surface K and shape | molds the last shape (the same shape as press roller R4 of FIGS. 6-8), and finishes the raw material W as a product.

  Accordingly, the plastic processing of the bottomed cylindrical material W is performed by placing the mandrel 3 on the inner peripheral surface of the material W with respect to the material W fixed by the chuck 21 in the same manner as the spinning machine 10 shown in FIG. On the other hand, the clearance roller R3 is made to enter with a gap, and the restriction roller R3 is moved to the distance that becomes the gap d4 with respect to the end surface of the material W (in the direction of the arrow X).

  Thereafter, as shown in FIG. 1, the first process pressing roller R <b> 1 is pressed against the peripheral surface of the end portion of the material W to form the semi-processed product Wa. At this time, since the first step pressing roller R1 is configured such that the large-diameter peripheral surface portion a1 and the small-diameter peripheral surface portion a2 of the stepped convex portion a are connected by the inclined surface K, the excessive portion b1 as shown in FIG. Will not occur.

  Next, as shown in FIG. 2, the final product Wb is formed by the second step pressing roller R2 having no inclined surface K. At this time, since the half-processed product Wa is formed by the first process pressing roller R1, in the second process, an inclined portion (only c part in FIG. 3A) of the semi-processed product Wa is plastically processed, and the final product. The meat turning b2 as shown in FIG. 9E does not occur in Wb.

  At this time, the inner diameter of the final product may be regulated by bringing the inner peripheral surface of the material W into contact with the peripheral surface of the mandrel 3 as in the spinning machine previously proposed by the present applicant as Japanese Patent Application No. 2004-361247. However, when the inner diameter accuracy of the final product is not required or when cutting is performed, it is not necessary to bring the material W into contact with the mandrel 3 as shown in FIG. Is sufficiently secured, it is not necessary to press the tip of the mandrel 3 against the inner bottom surface of the material W.

  FIG. 4 shows a second embodiment of the present invention. The spinning machine 1 includes a tip-side small-diameter portion 31 in which the tip portion of the mandrel 3 is smaller than the inner diameter of the material W, and a body-side large-diameter portion 32 configured substantially equal to the outer diameter of the material W. An embodiment in which the stepped wall portion 33 is constituted by a step between the distal end side small diameter portion 31 and the trunk portion side large diameter portion 32, and the material W to be stretched is regulated by the axial flow generated by the first step pressing roller R1. Instead of the one regulating roller R3, the step wall portion 33 regulates the stretching of the material.

  Then, the end portion of the material W is subjected to plastic working following the uneven shape of the first step pressing roller R1 and the inner peripheral surface of the tip side small diameter portion 31 of the mandrel 3 and the step wall portion 33. At this time, since the small-diameter portion 31 on the front end side of the mandrel 3 is smaller in diameter than the inner diameter of the body portion of the material W, the inner diameter of the end portion is smaller than the inner diameter of the body portion of the material W. The semi-processed product Wa having the uneven shape is plastically processed, and then the final product Wb is formed by the second step pressing roller R2 as in the first embodiment.

  As mentioned above, although the spinning machine of this invention was demonstrated based on the some Example, this invention is not limited to the structure described in the said Example, The structure is suitably changed in the range which does not deviate from the meaning. Is something that can be done.

  Since the spinning machine of the present invention can plastically process a product having a bottom inner diameter smaller than the inner diameter of the material from a bottomed cylindrical material, sufficiently secure the thickness of the groove formed on the outer peripheral surface of the end. It can be suitably used for the processing of products that need to be performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway cross-sectional view for explaining a processing procedure of a first step in the first embodiment of the spinning machine of the present invention, where (a) shows a state where a material is attached, and (b) shows a state where the first step is completed. Respectively. FIG. 3 is a partially cutaway cross-sectional view for explaining a processing procedure of a second step in the first embodiment of the spinning machine of the present invention, where (a) shows a semi-processed product state by the first step, and (b) completed processing. Each state is shown. The processed product shape | molded with the spinning machine of this invention is shown, (a) shows a semi-processed product, (b) shows a final product, respectively. It is a partially cutaway plan view showing a second embodiment of the spinning machine of the present invention. It is the front view of the partial cross section which shows the outline of the conventional spinning machine, (a) shows the state which attached the raw material and completed the process to a semi-finished product, (b) shows the state which completed the process to the final product, respectively. 1 is a partially cutaway front view showing a spinning machine previously proposed as Japanese Patent Application No. 2004-361247 by the present applicant. FIG. 3 is a partially cutaway plan view showing a spinning machine previously proposed by the present applicant as Japanese Patent Application No. 2004-361247. FIG. 2 is a partially cutaway cross-sectional view for explaining the processing procedure of a spinning machine previously proposed by the present applicant as Japanese Patent Application No. 2004-361247, in which (a) shows a state in which a material is attached, and (b) shows processing. Each completed state is shown. It is the schematic explaining generation | occurrence | production of the meat turnover, (a) is the state immediately after the start of processing, (b) is during processing, (c) is processing completion, (d) is of (a) The enlarged view of m1 part, (e) shows the enlarged view of m2 part of (c), respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spinning machine 2 Spindle 21 Chuck 3 Mandrel R1 1st process press roller R2 2nd process press roller K Inclined surface

Claims (1)

  In a spinning machine comprising a main shaft provided with a chuck for sandwiching the outer peripheral surface of a bottomed cylindrical material, and a pressure roller having a stepped protrusion that forms a groove at the end of the material, the pressure roller is a stepped protrusion. A spinning machine comprising: a first step pressing roller in which a large-diameter peripheral surface portion and a small-diameter peripheral surface portion are connected by an inclined surface; and a second step pressing roller formed into a final shape.

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