JP4602060B2 - Spinning machine - Google Patents

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 having an inner diameter of an opening side end portion 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. 6, 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 with the bottomed cylindrical semi-finished material 51a. Next, the pressure roller 53 is pressed against the peripheral surface of the semi-finished material 51a to complete the brake piston 51b in which the groove portion 51c is formed on the outer peripheral surface of the end portion.

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.
In any case, there has been no proposal of a spinning machine capable of plastically processing a bottomed cylindrical material having a smaller inner diameter at the opening side end than the inner diameter of the material.
JP 2002-70902 A

  In view of the problems of the conventional spinning machine, the present invention can secure the strength of the groove formed on the outer peripheral surface of the opening side end, and the inner diameter of the opening side end is the inner diameter of the trunk as the final shape. An object of the present invention is to provide a spinning machine capable of plastic working with a smaller shape.

In order to achieve the above object, the spinning machine of the present invention is a spinning machine that performs plastic working on the opening side end of a bottomed cylindrical material, and a main shaft provided with a chuck that sandwiches the outer peripheral surface of the material, A mandrel having a diameter smaller than the inner diameter of the material barrel, a pressure roller that presses the end of the material on the opening side against the mandrel, and a rotary shaft that is rotatably attached to a rotation axis that is perpendicular to the axis of the main shaft. A regulating roller having a roller surface that regulates the axial extension of the end portion on the opening side of the material by being pressed by the roller, and the inner diameter of the end portion on the opening side of the material is larger than the inner diameter of the trunk portion of the material It is characterized by plastic processing so as to have a small diameter.

According to the spinning machine of the present invention, since the axial extension of the end portion on the opening side of the material is regulated by the roller surface (circumferential surface) of the regulating roller, the regulating roller presses and slides on the end surface on the opening side of the material. Thus, it is possible to obtain an end face with higher processing accuracy than that regulated by the step portion of the mandrel. In addition, by pressing the regulating roller in the axial direction of the main shaft and the main shaft side, it is possible to secure a further thickness at the end portion on the opening side of the material.

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

In FIGS. 1-2, showing a reference example of a spinning machine.
In the spinning machine 1, a chuck 21 that sandwiches a material W is disposed at the tip of a main shaft 2 that is connected to a rotating mechanism 6, and a mandrel 3 that has the same core as the chuck 21 is disposed at a position facing the chuck 21. It is arranged.
At the front end of the holder 4, a pressing roller R1 having a concavo-convex portion for subjecting the outer peripheral surface of the end portion of the material W to plastic processing having a desired concavo-convex shape is rotatably attached. The holder 4 is configured to move in a direction perpendicular to the axis of the main shaft 2 (arrow Y1 direction) by a control signal from a control device (not shown).

The chuck 21 is formed in a cylindrical shape, and a clamping member 22 corresponding to the outer diameter of the material W is disposed therein, and a regulating member 23 corresponding to the length of the material W to be attached is disposed therein, as shown in FIG. The material W is fixed at the position.
Further, the chuck 21 is configured to be removed from the main shaft 2 together with the clamping member 22 and the regulating member 23 so as to be replaceable with the chuck 21 corresponding to the product shape (material W).

The mandrel 3 includes a small-diameter portion 31 having a shaft core that is the same as the shaft core of the main shaft 2 and having a tip portion smaller than the inner diameter of the material W, and a large-diameter portion 32 that is substantially equal to the outer diameter of the material W. Prepare. A step 33 is constituted by a step between the small-diameter portion 31 and the large-diameter portion 32 of the mandrel 3 (an end surface of the large-diameter portion 32), and the material W stretched by the axial flow generated by the pressing roller R1 is the step 33. Abut.
Similarly to the chuck 21, the mandrel 3 is arranged 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 and outer diameters of the material W, inner diameter of the processed product end). It attaches to the provided attachment member 71 so that contact / separation is possible.

 In the above configuration, the small diameter portion 31 of the mandrel 3 with respect to the material W fixed by the chuck 21 is spaced from the inner peripheral surface of the material W by a gap d1 and the step 33 from the end surface of the material W. Until the distance becomes a distance away from the gap d2 (see FIG. 2A). The values of the gaps d1 and d2 are determined by calculating the end meat flow caused by plastic working.

  Next, by pressing the pressing roller R1 in the direction of the arrow Y1, the end portion of the material W is subjected to plastic working following the uneven shape of the pressing roller R1, the inner peripheral surface of the small-diameter portion 31 of the mandrel 3, and the step portion 33. Applied. At this time, since the small-diameter portion 31 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 shape is plastic processed. At this time, the thickness n1 of the groove portion can ensure a sufficient thickness by making the inner diameter of the end portion smaller than the inner diameter of the body portion of the material W.

3 to 5 show an embodiment of the spinning machine of the present invention.
In the spinning machine 1, a chuck 21 that sandwiches the material W is disposed at the tip of a main shaft 2 that is coupled to the rotation mechanism 6, and a mandrel 3 that has the same axis is disposed at a position facing the chuck 21. I have to.
Similar to the above-described reference example, a pressing roller R1 having a concavo-convex portion for subjecting the outer peripheral surface of the end portion of the material W to plastic processing having a desired concavo-convex shape is rotatably attached to the tip of the holder 4. 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. 5B). ).

  In the spinning machine 1, a regulation roller R <b> 2 that regulates the end face of the end of the material W is attached to the tip of the holder 5 so as to be rotatable. This regulating roller R2 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).

The configuration of the chuck 21 is the same as that in the above-described reference example, and is configured to be removed from the main shaft 2 together with the clamping member 22 and the regulating member 23 and replaceable 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 R1 contacts the peripheral surface of the mandrel 3 and the roller surface of the regulating roller R2.
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.

In the above configuration, the mandrel 3 is made to enter the material W fixed by the chuck 21 with a gap d3 with respect to the inner peripheral surface of the material W, and the regulating roller R2 is made to face the end surface of the material W. Then, the distance is shifted to the distance d4 (arrow X direction) (see FIG. 5A). The values of the gaps d3 and d4 are determined by calculating the meat flow at the end caused by the plastic working, similarly to d1 and d2.
Further, the regulating roller R2 generates a wall flow so as to increase the thickness of the end portion by pressing in the direction in which the gap d4 becomes small, that is, the axial direction of the main shaft 2 and the main shaft 2 side (arrow X direction). The thickness n1 of the final product can be secured more sufficiently than in the above reference example.

Next, the pressing roller R1 is pressed in the direction of the arrow Y2, and the end portion of the material W is brought into contact with the concavo-convex shape of the pressing roller R1, the peripheral surface of the mandrel 3 and the regulating roller R2, 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 a desired concavo-convex shape is plastic-worked on the outer peripheral surface thereof as in the above reference example.
In addition, the transfer direction of the pressing roller R1 can be the arrow P direction. When pressing obliquely as in the direction of the arrow P, while causing the wall thickness n1 of the end portion to be increased by the pressing action of the regulating roller R2 toward the axial direction of the main shaft 2 and toward the main shaft 2, It can be plastically processed.

Although the spinning machine of the present invention have been described based on the example of its, the present invention is not limited to the configuration described in the embodiment described above, appropriately changed its configuration without departing from the scope and spirit thereof 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.

It is a front view of a portion cut-away cross-section showing a reference example of the scan pinning machine. It is sectional drawing explaining the process point of the spinning machine, (a) shows the state which attached the raw material, (b) shows the state which completed the process, respectively. It is a partially cutaway front view showing an embodiment of the spinning machine of the present invention. There is a plan view of the cut-out part of the same spinning machine It is a partially cutaway sectional view explaining the processing procedure of the spinning machine, where (a) shows a state where a material is attached and (b) shows a state where processing is completed. 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.

DESCRIPTION OF SYMBOLS 1 Spinning machine 2 Spindle 21 Chuck 3 Mandrel 31 Small diameter part 33 Step part R1 Pressure roller R2 Control roller

Claims (1)

  In a spinning machine that performs plastic working on the open end of a bottomed cylindrical material, a spindle with a chuck that clamps the outer peripheral surface of the material, a mandrel with a diameter smaller than the inner diameter of the material body, A pressure roller that presses the opening end against the mandrel, and an end on the opening side of the material that is rotatably attached to a rotating shaft in a direction perpendicular to the axis of the main shaft and is pressed by the pressing roller Spinning characterized by comprising a restricting roller having a roller surface for restricting the axial extension of the material, and plastic working so that the inner diameter of the end portion on the opening side of the material is smaller than the inner diameter of the body portion of the material Machine.

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