JPH10166095A - Cold ring forming machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a ring body with out-of-roundness of high grade in a cold ring forming machine. SOLUTION: The cold ring forming machine is constituted in that a ring form work W is rolled between a rotatably drivem main roller 3 and a rotatably driven mandrel 4. A first and a second sub-rollers 5, 6 to correct the shape of work W capable of rolling freely is put in press-contact with the outer peripheral surface of the work W. A pressing force control means is prepared so that the first and second sub-rollers 5, 6 are each made always to press the outer peripheral surface of the work W with a fixed pressing force. Regarding the work W penetrated by the mandrel 4, the main roller 3 and the first sub- roller 5 are arranged almost to the opposite with each other. At a location with 60 deg.-120 deg. off to the direction of feeding out the work W from the press- contact point of the main roller 3 with the work W centering the axial center of the work W, the second sub-roller 6 is arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cold ring forming machine.

[0002]

2. Description of the Related Art Conventionally, in order to cold-roll a ring-shaped work, a mandrel inserted into the ring-shaped work is pressed against a main roller, and the mandrel and the main roller are driven to rotate. A cold ring molding machine was used. That is, cold rolling was performed only with the mandrel and the main roller.

[0003]

However, in the above-described cold ring forming machine, there is a problem that the shape of the workpiece deviates greatly from a perfect circle as the rolling progresses.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a cold ring forming machine capable of forming a ring having high roundness.

[0005]

In order to achieve the above-mentioned object, a cold ring forming machine according to the present invention comprises a main roller which is driven to rotate, a main roller which is inserted into a ring-shaped work, and which is provided with the main roller. A cold ring forming machine configured to roll the work in between a mandrel that presses and rotates the work, wherein the first and second sub-rollers correct the shape of the work. , Which are in rolling contact with the outer peripheral surface of the work.

Further, it is preferable that a pressing force control means for pressing the first and second sub-rollers to the outer peripheral surface of the work with a constant pressing force is always provided. In addition, a main roller and a first sub-roller are disposed substantially opposite to each other with respect to the work inserted through the mandrel, and the work is sent out from a contact point where the main roller is pressed against the work about the axis of the work. It is desirable that the second sub-roller is arranged at a position of 60 ° to 120 ° in the direction in which the second sub-roller moves.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on the illustrated embodiments.

FIG. 1 and FIG. 2 show an embodiment of a cold ring forming machine according to the present invention. This cold ring forming machine is used to convert a metal ring-shaped work into a ring body having a larger diameter. R for forming a base, a base 1 and a main roller 3 pivotally mounted on a mounting block 2 fixed on the base 1 so as to be rotatable around a horizontal axis L ₁ . The workpiece W is inserted into the ring-shaped workpiece W and
And a first and second sub-roller 5 and 6 for correcting the shape of the work.

The main roller 3 has an angular groove 7 in the circumferential direction on the outer peripheral surface, and one end of a shaft rod 8 is fixed to the central portion in a penetrating manner. The shaft 8 is rotatably mounted on the mounting block 2 via a plurality of bearings. A motor 9 for rotating the main roller 3 is mounted on the mounting block 2.
Is attached. The output shaft of the motor 9 has a gear 10a,
It is linked to the other end of the shaft 8 via 10b. That is, the main roller 3 is driven to rotate by the motor 9.

The mandrel 4 has a lower end at a substantially middle height position of the swing arm 11 pivotally attached to the mounting block 2.
Rotatably attached to the horizontal axis L ₁ parallel to the horizontal axis L ₂ around the main roller 3. Here, the horizontal axis L ₂
It is preferably set to 5mm~20mm lower position than the horizontal axis L _1. The reason is that the operation (effect) of the second sub-roller 6 is improved. Note that, in particular, the horizontal axis L ₂
The good to about 10mm below the horizontal axis L _1. Specifically, one end of the mandrel 4 is connected to a cylinder 13 via a connecting rod 12, and the mandrel 4 can be slidably driven to one end by the cylinder 13. Thereby, the work W can be removed.

Further, the mandrel 4 and the connecting rod 12 are
It is rotatably attached to the swing arm 11 via a pipe-shaped member 14 and a bearing. Further, the connecting rod 12 and the pipe-shaped member 14 have a spline-shaped structure so as not to rotate relatively.
Further, a motor 15 for rotating and driving the mandrel 4 is provided near the cylinder 13. Specifically, the output shaft of the motor 15 and the pipe-shaped member 14 are interlocked and connected to each other by an interlocking connection mechanism 16 including a chain and a sprocket. That is, the mandrel 4 is connected to the interlocking connection mechanism 16.
The rotation is driven by a motor 15 via the pipe-shaped member 14 and the connecting rod 12.

The upper end of the swing arm 11 is connected to a connecting member.
17 and connected to the cylinder 27, the cylinder 27
Is driven to swing toward the main roller 3.
Then, the mandrel 4 is strongly pressed against the work W by the principle of leverage, and the work W is rolled between the rotationally driven mandrel 4 and the rotationally driven main roller 3. That is, the work W is configured to be rolled between the main roller 3 driven to rotate and the mandrel 4 pressed against the main roller 3 and driven to rotate.

As shown in FIGS. 3 and 4, the workpiece W inserted into the mandrel 4 is substantially opposite to the workpiece W.
A main roller 3 is disposed a first sub-roller 5, and the main roller 3 around the axis L ₃ of the workpiece W is 60 ° of ~ 120 ° to the direction in which the workpiece W is fed from the contact P to pressure contact with the workpiece W The second sub-roller 6 is arranged at the position.

The first and second sub rollers 5, 6
Is rollably pressed against the outer peripheral surface of the work W. Specifically, circumferential angular grooves 18 and 19 are formed on the outer peripheral surfaces of the first and second sub-rollers 5 and 6, and the bottom surface of the angular grooves 18 and 19 and the bottom surface of the angular groove 7 of the main roller 3 form a workpiece. W is pressed against the outer peripheral surface.

Returning to FIGS. 1 and 2, the first sub-roller 5
Is inclinedly attached to a mounting member 20 fixed to the upper surface of the base 1, and is pivotally attached to a tip end of an inclined arm 21 slidable in the inclined direction. Its inclined arm 21
Is connected to the cylinder 22 and the cylinder 22
The first sub-roller 5 is pressed against the work W by the pressing force of. The second sub-roller 6 is pivotally attached to a tip end of a swing arm 23 which is pivotally attached to the mounting member 20 around a horizontal axis. A cylinder 24 that presses the tip end of the swing arm 23 upward is attached to the mounting member 20, and the second sub-roller 6 is pressed against the lower surface of the work W by the pressing force of the cylinder 24.

The first and second sub-rollers 5 and 6 are constantly pressed against the outer peripheral surface of the workpiece W with a constant pressing force by a pressing force control means described later. That is, the cold ring forming machine includes a pressing force control unit that constantly presses the first and second sub-rollers 5, 6 against the outer peripheral surface of the work W with a constant pressing force. A work supply path 25 for supplying the work W to the mandrel 4 is provided above the inclined arm 21. Further, a discharge path 26 for discharging the ring body R formed by rolling is formed in the swing arm 23.

Next, FIG. 5 shows a hydraulic circuit of each of the cylinders 13, 22, 24, 27 of the cold ring forming machine. Pump 31
Is connected via a switching valve 32 and a flow control valve 33 with a check valve to the cylinder 13 for operating the mandrel 4 so that pressure oil is sent to the cylinder. Further, the pipe at the discharge part of the pump 31 is partially branched and connected via piping such as a solenoid valve 34 so that pressure oil is sent to the cylinder 27 for the swing arm 11. In addition, pressure oil is sent to the cylinders 22 and 24 through valves such as solenoid valves 35 and 36, respectively, by branching a pipe at a discharge portion of the pump 31.

By the way, 37 and 38 are relief valves which are connected to the high pressure side of the cylinders 22 and 24, respectively.
The pressing force of the first sub-roller 5 and the second sub-roller 6 can always be kept constant. That is, the pressing force control means 30, 30 for keeping the pressing force of the first sub-roller 5 and the second sub-roller 6 constant at all times is constituted by relief valves 37, 38 in FIG. It should be noted that a pressure control valve other than the relief valves 37 and 38 can be used.

The operation of the cold ring forming machine will now be described. As shown in FIG. 3, the work W is rolled between the mandrel 4 inserted into the work W and the main roller 3, and thereafter, As shown in FIG. 4, the diameter of the work W gradually increases. At that time, the first sub-roller 5 is pressed against the outer peripheral surface of the work W from the side opposite to the main roller 3 with a constant pressing force, and the second sub-roller 6 is pressed against the lower surface of the work W with a constant pressing force. .

That is, as the diameter of the work W increases, the first
The second sub-roller 5, 6 is retracted away from the axis L ₃ of the workpiece W, and the pressing force of the first and second sub-roller 5, 6 is kept constant. The first and second sub rollers 5,
The control of the pressing force 6 is performed by the pressing force control means described with reference to FIG.
Performed at 30,30. Thereby, a perfect circle of the work W is easily formed, and a ring body with high roundness can be formed.

By the way, without using the first and second sub-rollers 5 and 6, only the main roller 3 and the mandrel 4 have an outer diameter of 64.
When a ring body of mm was formed, the roundness was 0.8 to 1.0 mm. On the other hand, when a cold ring molding machine of the present invention was actually manufactured, a ring body having an outer diameter of 64 mm was formed using the first and second sub-rollers 5 and 6, the main roller 3, and the mandrel 4. And the roundness was 0.06 mm. From this, it can be said that according to the cold ring forming machine of the present invention, a ring body having high roundness can be formed.

The second roller is located at a position of 60 ° to 120 ° about the axis L ₃ of the work W from the contact point P where the main roller 3 is pressed against the work W in the direction in which the work W is sent out.
The reason why the sub-roller 6 is disposed is that if the angle is less than 60 °, the contact point at which the second sub-roller 6 is pressed against the work W becomes too close to the contact P of the main roller 3 and the roundness of the work W is reduced. If the angle exceeds 120 °, the contact point at which the second sub-roller 6 is pressed against the work W becomes too close to the contact point of the first sub-roller 5, and the roundness of the work W is reduced.

[0023]

The present invention has the following remarkable effects by the above-mentioned structure.

According to the cold ring forming machine of the first aspect, the ring-shaped workpiece W can be easily formed in a perfect circle, and a ring having a high roundness can be formed.

According to the cold ring molding machine of the second aspect, the same effects as those of the first aspect can be obtained,
A ring body with even higher roundness can be formed.

According to the cold ring forming machine of the third aspect, the same effect as that of the first or second aspect can be obtained, and a ring body with even higher roundness can be formed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional front view of a main part showing one embodiment of the present invention.

FIG. 2 is a cross-sectional plan view of a main part.

FIG. 3 is an operation explanatory view.

FIG. 4 is an operation explanatory view.

FIG. 5 is a hydraulic circuit diagram.

[Explanation of symbols]

3 Main roller 4 Mandrel 5 First sub roller 6 Second sub roller 30 Pressing force control means L ₃ axis P contact W Work

Claims (3)

[Claims] 1. A main roller 3 which is driven to rotate and which is inserted into a ring-shaped workpiece W
Mandrel 4 that presses the workpiece W and is driven to rotate
In the meantime, a cold ring forming machine configured to roll the work W, wherein first and second sub-rollers 5 and 6 for correcting the shape of the work W are provided. A cold ring molding machine characterized by being rollably pressed against the outer peripheral surface. 2. A work W, comprising:
2. The cold ring forming machine according to claim 1, further comprising pressing force control means for pressing the outer peripheral surface of the member at a constant pressing force. To 3. A substantially opposite to each other with respect to inserted through the workpiece W to the mandrel 4, the main roller 3 is first sub-roller 5 is disposed, and is the main roller 3 around the axis L ₃ of the workpiece W The contact point P that presses against the work W
The cold ring molding machine according to claim 1 or 2, wherein the second sub-roller (6) is disposed at a position of 60 to 120 degrees in a direction in which the work (W) is fed out from the first roller (3).