JPH11123486A - Manufacture of cylindrical parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and surely remove burrs by roll-forming an inner circumferential side of an opening end part directly to a regular parts shape, and roll- forming an outer circumferential side into an excessive wall thickness part. SOLUTION: A disk-like steel plate having a hollow boss part W1 in a center part is a starting stock, and the steel plate is supported by a mandrel 1 and a tail stock 2, and turned, and then, gradually pressed against the mandrel 1 by a forming roller 3 from a forward end side to a base end side to form the stock into a cylindrical shape. After the tail stock 2 is detached from a work W, the formed work W is drawn out of the mandrel 1. An excessive wall thickness part W3 of a formed end part is cut and removed by a lathe along an outer circumferential surface of the work W. Burrs generated in an outer circumferential edge part of an opening end face W2 of the work W can be removed by the cutting through the chamfering.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a cylindrical part such as a clutch drum of an automatic transmission by roll forming, and more particularly to a method of easily removing burrs generated when cutting excess material after forming. Belonging to the technical field.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Application Laid-Open No. 9-29375
As disclosed in Japanese Unexamined Patent Publication, a method of manufacturing a clutch drum of an automatic transmission by roll forming is known. In such a method of manufacturing a clutch drum by roll forming, generally, a cylindrical work is formed by roll forming, and as shown in FIG. To form a regular open end face W22 of the component.

[0003]

However, the surplus W
Burrs are formed on the inner peripheral edge W21 of the opening end face W22 by the cutting of No. 20, and the burrs may hinder the fitting of the clutch plate or the like at the time of assembling the automatic transmission or cause the generation of foreign matter. Therefore, it is necessary to remove this burr. However, even if it is attempted to remove the burrs by chamfering or the like, the spline W5,
Since W5,... Are formed, removal by chamfering or the like is extremely difficult.

[0004] For this reason, there is a problem that the deburring must be performed manually, and the number of steps increases, and the cost becomes extremely high.

Therefore, in order to facilitate the deburring of the opening end, as shown in FIGS.
The splines W5, W5
,... Are not formed, the surplus thickness W20 is cut to form the opening end face W22, and then the inner peripheral edge W21 of the opening end face W22 is chamfered to remove burrs.

However, in this method, since there is a restriction in lathing in the chamfering, the removal of burrs tends to be insufficient. That is, in general, the spline W of the clutch drum
, W5,... Are provided with snap ring grooves W6, W6,... For fixing the clutch plate in the circumferential direction, and the strength around the snap ring grooves W6, W6,. To do so, the snap ring groove W
It is necessary to set the length from 6 to the end of each spline W5 to be large, so that the distance d (shown only in FIG. 10) between the end of each spline W5 and the open end face W22 is made too large. It is not possible. For this reason, spline W5
, W5,..., While avoiding interference with the end portions, the chamfering width of the inner peripheral edge W21 of the opening end face W22 cannot be made sufficiently large, and burrs tend to be insufficiently removed.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to make it possible to easily and reliably remove burrs by devising the shape of a molding end of a work. It is to make.

[0008]

In order to achieve the above object, according to the present invention, the inner peripheral side of the open end of a cylindrical part is directly roll-formed into a regular part shape, and other parts are roll-formed. The part was made to be a surplus part.

More specifically, according to the first aspect of the present invention, after the work is formed into a cylindrical shape by a roll, the excess thickness of the formed end portion, which is the opening, is removed by machining to manufacture the cylindrical part. Target method. Then, at the time of the roll forming, at least a portion of the work which is to be on the inner peripheral side of the opening end of the component is directly formed into a part shape by a molding die, and subsequently, an excess thickness is formed on the outer peripheral side of the part which is to be the inner peripheral side of the opening end. Is removed.

[0010] According to this method, at least a portion of the work formed into a cylindrical shape by roll forming, which is on the inner peripheral side of the open end portion of the component, is directly formed into the component shape by the forming die, and the outer peripheral side of this portion is left over. Meat is formed. For this reason, when the excess thickness is removed by machining, burrs are formed on the outer peripheral side of the opening end of the component and are not generated on the inner peripheral side,
Burrs can be easily and reliably removed, and even if some burrs remain, there is no problem in fitting other parts to the open end.

According to the second aspect of the present invention, a spline is formed on the inner peripheral surface of the work during the roll forming in the first aspect of the present invention. This makes it possible to connect another component to the cylindrical component by spline fitting.

In the case where a spline is formed on the inner peripheral surface of the work, it is extremely difficult to remove burrs generated on the inner peripheral side of the opening end of the component by the conventional manufacturing method, so that the cost increases. Removal of burrs may be insufficient,
If the burr generated by machining is generated only on the outer peripheral side of the opening end as in the first aspect of the invention, the burr can be easily and reliably removed, and the operation and effect of the first aspect of the invention can be achieved. Is particularly effective.

According to the third aspect of the present invention, the first or second aspect is provided.
The inner peripheral edge of the forming end of the work in the invention described in the above is roll-formed on a tapered surface inclined in the expanding direction toward the tip side of the forming end, and the formed end is machined in the middle of the tapered surface. Remove.

As a result, a tapered surface is formed on the inner peripheral edge of the formed end portion of the work, and a portion of the tapered surface from the middle to the outer peripheral portion has excess thickness. When removed to form the open end surface of the component, burrs are formed on the boundary between the open end surface and the tapered surface, that is, on the outermost peripheral side of the tapered surface remaining on the inner peripheral side of the open end. That is, the shape of the workpiece forming end is embodied, and the operation of the invention described in claim 1 or 2 is realized.

According to a fourth aspect of the present invention, there is provided a method according to the first aspect of the present invention, wherein the forming end portion of the workpiece is formed by rolling an inner peripheral portion serving as an opening end surface of a part and a surplus portion located on the outer peripheral side thereof. Molding.

As a result, the opening end surface of the component is directly formed on the inner peripheral side of the forming end portion of the workpiece by the molding die, and the extra thickness is formed so as to protrude outward from the outer peripheral side. For this reason, when the excess thickness is removed by machining, burrs are formed on the outer peripheral edge of the opening end face, so that the effect of the invention of claim 1 or 2 is the same as the invention of claim 3. Is achieved.

When a spline is formed on the inner peripheral surface of the work, the spline can be formed up to the open end, so that the distance from the end of the spline to the snap ring groove is set sufficiently large. The strength of this portion can be increased.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIGS. 1 to 4 show an embodiment in which a method of manufacturing a cylindrical part according to the present invention is applied to the manufacture of a clutch drum of an automatic transmission (not shown). This is a substantially cylindrical mandrel (forming mold) for roll forming. The mandrel 1 is provided on a headstock (not shown) so that the axis X extends in a substantially horizontal direction, and is driven to rotate by an electric motor or the like. . The outer peripheral surface and the distal end surface of the mandrel 1 on the distal end side (right side in the drawing) with respect to the substantially central portion in the direction of the axis X are formed in a shape corresponding to the inner surface of the work W, and a circular cross section is formed substantially in the central portion of the distal end surface. A hole 1a is formed. Then, the workpiece W is fixed to the hole 1a of the mandrel 1 with the hollow boss portion W1 at the center portion fixed therein, and is supported rotatably by the tail stock 2 from the opposite side (right side in the figure). It is rotated integrally with the mandrel 1.

Although the tail stock 2 is not shown,
It is rotatably provided on a carriage that advances and retreats with respect to the headstock on the base of the roll forming apparatus, protrudes toward the headstock, extends substantially horizontally, and supports the work W with the mandrel 1 by sandwiching the work W. is there. Reference numeral 3 denotes a forming roller for pressing the work W against the mandrel 1 to form the work.
The forming roller 3 can move forward and backward in the direction of the axis X of the mandrel 1 together with the carriage, and can move forward and backward in the radial direction of the mandrel 1 toward the axis X. That is, the forming roller 3 comes into contact with the workpiece W at a position displaced by a predetermined amount in the radial direction from the axis X of the mandrel 1, and FIG.
As shown in (1), the workpiece W is advanced along the outer shape of the mandrel 1 in the direction of the axis X (to the left in the drawing), and the work W rotated integrally with the mandrel 1 is gradually formed.

As a feature of the present invention, the mandrel 1 has a vertical wall surface 1b for directly forming a portion of the work W, which becomes a regular opening end face of the clutch drum (component), into a component shape.

That is, the mandrel 1 has a small-diameter portion, a medium-diameter portion, and a large-diameter portion in this order from the distal end side in the direction of the axis X, and a step at the boundary between the medium-diameter portion and the large-diameter portion has an axis X An annular vertical wall surface 1b extending in a direction orthogonal to
The distance between the vertical wall surface 1b and the tip surface is the axis X of the workpiece W.
It is approximately equal to the inner dimension in the direction. This vertical wall 1b
Thus, the workpiece W is formed so that the formed end face of the work W becomes the regular open end face of the clutch drum (part) as it is.

The splines W5, W5,... Formed on the inner peripheral surface of the work W from the base end to the distal end correspond to the outer peripheral surface of the middle diameter portion of the mandrel 1 (see FIGS. 3 and 4). Spline grooves 1c, 1c,...
Are shown at regular intervals in the circumferential direction. Further, a radius R1 having a predetermined radius is formed on the outer peripheral edge of the vertical wall surface 1b.

When the work W is roll-formed using the mandrel 1, first, a hollow boss W1 is formed at the center.
A disk-shaped steel sheet (shown by phantom lines in FIG. 2) having the following is prepared as a material, and the steel sheet is rotated from the distal end to the proximal end by the forming roller 3 while being supported and rotated by the mandrel 1 and the tail stock 2. It is gradually pressed against the mandrel 1 to form a cylindrical shape.

When the forming is completed, as shown in FIG.
b, it is directly formed as an open end face W2,
As shown in FIGS. 3 and 4, the excess thickness W3 (shown by phantom lines in FIGS. 3 and 4) of the molding end is bent after protruding outward from the outer peripheral side of the opening end face W2, thereby forming a mandrel. 1 extends in the axis X direction along the large diameter portion.

Subsequently, the tailstock 2 is separated from the work W by retreating the carriage from the headstock, and the work W after the completion of molding is removed from the mandrel 1. Then, the excess thickness W3 at the forming end is removed by cutting with a lathe along the outer peripheral surface of the work W. Burrs generated at the outer peripheral edge W4 of the opening end face W2 of the work W by this cutting are removed by chamfering.

Therefore, in the first embodiment, the regular opening end face W2 of the clutch drum (part) W is directly formed into a part shape by the vertical wall surface 1b of the mandrel 1, and the excess thickness W3 of the forming end is formed by the opening W3. Since it is formed so as to protrude outward from the outer peripheral side of the end face W2, burrs are generated on the outer peripheral edge W4 of the opening end face W2 when the excess thickness W3 is turned.
For this reason, splines W5, W5,
Are formed, burrs can be easily and reliably removed by chamfering.

Even if burrs remain, the burrs are located on the outer peripheral side of the opening end face W2, so that there is no problem when fitting other parts such as the clutch plate to the work W.
At that time, there is no possibility that the burr will be chipped off and become a foreign matter.

That is, the clutch drum manufactured by the above-described method can easily assemble a clutch plate and the like in an assembly line of an automatic transmission, thereby facilitating an assembling operation.

Further, in this embodiment, the spline grooves 1c, 1 extending from the base end to the front end of the middle diameter portion of the mandrel 1 are provided.
Since c,... form the splines W5, W5,... up to the opening end of the work W, the length from the snap ring groove W6 formed in each spline W5 to the end of each spline W5 is sufficient. It can be set to a large value, and the strength of this portion can be increased.

In addition, the radius of the radius R1 formed on the outer peripheral edge of the vertical wall surface 1b of the mandrel 1 can be set independently of the size and shape of the work W. By setting it to be large, the mandrel 1 can have a long life.

(Embodiment 2) FIG. 5 shows a mandrel 10 according to Embodiment 2 of the present invention (the same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted). The mandrel 10 has substantially the same shape as the mandrel 1 according to the first embodiment, has a large-diameter portion formed with a slightly smaller diameter, and a step at the boundary between the large-diameter portion and the middle-diameter portion includes an axis X.
A tapered wall surface 10b whose outer diameter gradually increases from the distal end side (right side in the drawing) to the base end side (left side in the drawing) in the direction is formed.

The distance from a predetermined position in the middle of the tapered wall surface 10b to the tip surface of the mandrel is determined by the work W
Is substantially equal to the inner dimension in the direction of the axis X. further,
In the middle diameter portion of the mandrel 10, spline grooves 10c, 10c,... Similar to the mandrel 1 of the first embodiment are provided.
It is formed from a position slightly away from the tapered wall surface 10b to the tip.

When the work W is formed using the mandrel 10 in the same manner as in the first embodiment, FIGS.
As shown in FIG.
Thus, a tapered surface W10 that is inclined in the expanding direction toward the tip end side (the left side in FIG. 5) of the formed end is formed on the inner peripheral edge of the formed end of the work W. The inner peripheral side of this tapered surface W10 has a shape corresponding to the chamfered surface of the inner peripheral edge W21 of the open end surface W22 in the conventional example (see FIGS. 9 and 10), while the outer peripheral side of the forming end portion has The portion on the tip side is surplus W11.

Subsequently, in the same manner as in the first embodiment, the work W is extracted from the mandrel 10, and the excess thickness W11 of the formed end of the work W is removed by cutting with a lathe along a plane substantially perpendicular to the axis X. Thus, an opening end face W12 (shown only in FIG. 7) is formed. At this time, burrs due to cutting occur on the inner peripheral edge of the opening end surface W12, that is, on the outermost peripheral side of the tapered surface W10 remaining on the inner peripheral side of the opening end portion.

Therefore, in the second embodiment, the inner peripheral side of the tapered surface W10 at the forming end of the work W is
As a result, the excess thickness W11 is formed on the outer peripheral side, so that when the excess thickness W11 is cut, burrs are generated on the outermost peripheral side of the remaining tapered surface W10. Therefore, similarly to the first embodiment, the burrs can be easily and reliably removed, and there is no hindrance when fitting other components such as the clutch plate to the work W. There is no risk of chipping and foreign matter.

The present invention is not limited to the first and second embodiments, but includes other various embodiments. That is, the above embodiment shows an example in which the present invention is applied to a clutch drum of an automobile. However, the present invention is not limited to this. Applicable.

[0038]

As described above, according to the method for manufacturing a cylindrical part according to the first aspect of the present invention, at least a part of the work which is on the inner peripheral side of the open end of the part is directly formed by the forming die. By molding into a shape, it is possible to prevent burrs from being generated on the inner peripheral side of the open end when the excess thickness at the molded end is removed by machining, so that the burr is easily and reliably removed. In addition, it is possible to prevent burrs from hindering the fitting of another part to the opening end.

This is particularly effective when the spline is formed on the inner peripheral surface of the work as in the second aspect of the present invention, and it is extremely difficult to remove burrs generated on the inner peripheral side of the opening end. It is.

According to the third aspect of the present invention, burrs due to cutting are generated on the outermost peripheral side of the tapered surface of the inner peripheral edge of the opening end, so that the burrs can be easily and reliably removed, and other parts can be removed. It does not interfere with the fitting.

According to the fourth aspect of the present invention, since burrs due to cutting are generated on the outer peripheral edge of the opening end face, the burrs can be easily and reliably removed, and there is no problem in fitting with other parts. In addition, the spline on the inner peripheral surface of the work can be formed up to the opening end, and the strength of the peripheral portion of the snap ring groove can be increased.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view illustrating a configuration of a mandrel according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a state in which a workpiece is being roll-formed;
FIG.

FIG. 3 is a perspective view showing a shape of a forming end of a work.

FIG. 4 is a cross-sectional view showing a shape of a forming end of a work.

FIG. 5 is a diagram corresponding to FIG. 1 according to the second embodiment.

FIG. 6 is a diagram corresponding to FIG. 3 according to the second embodiment.

FIG. 7 is a diagram corresponding to FIG. 4 according to the second embodiment.

FIG. 8 is a diagram corresponding to FIG. 3 relating to a work of a conventional example.

9 is a diagram corresponding to FIG. 3 relating to a work of a conventional example different from FIG. 8;

10 is a diagram corresponding to FIG. 4 relating to the work of FIG. 9;

[Explanation of symbols]

 1 Mandrel (molding die) W Work W3, W11, W20 Excess thickness of molding end W5 Spline W10 Tapered surface W2, W12, W22 Open end surface of part

Claims (4)

[Claims] 1. A method for manufacturing a cylindrical part by forming a work into a cylindrical shape by a roll and then removing the excess thickness of a forming end portion which is an opening by machining, wherein at least the work is formed at the time of the roll forming. A cylindrical shape characterized by directly forming a part on the inner peripheral side of the open end portion of the component into a part shape using a molding die, and then removing excess thickness on the outer peripheral side from the part on the inner peripheral side of the open end portion. The method of manufacturing the part. 2. The method according to claim 1, wherein a spline is formed on the inner peripheral surface of the workpiece during roll forming. 3. The work according to claim 1, wherein the inner peripheral edge of the forming end of the workpiece is roll-formed on a tapered surface inclined in a direction of opening toward the tip end of the forming end, and the middle of the tapered surface. A method of manufacturing a cylindrical part, comprising removing a molded end by machining. 4. The method according to claim 1, wherein an inner peripheral portion serving as an opening end surface of the component and a surplus portion located on the outer peripheral side thereof are roll-formed on the forming end of the workpiece. Of manufacturing cylindrical parts.