JPH0323024A - Manufacture for grooved clutch plate - Google Patents

Abstract

PURPOSE:To exactly make the groove form by pulling the band steel plate with a pulling mechanism while the band steel plate at the exit side is inclined tot he direction nearing the flat roll than the tangent direction at the facing region of the butting roll and flat roll on the groove forming process. CONSTITUTION:The band steel plate is rolled with the butting roll 34 and the flat roll 35, the grooved group are formed at one side of the surface of the band steel plate and the above band steel plate is transferred while being pulled with a pulling mechanism. And the band steel plate after passing the groove forming process are punched to the prescribed clutch form with the punching die. Then on the grooving process, the band steel plate positioned at the rolling exit side are pulled with the pulling mechanism while inclined angle theta2 to the direction nearing the flat roll 35 than the tangent direction X at the facing region of the butting roll 34 and the flat roll 35. In such a way, the projecting part of the butting roll are easily removed from the groove formed on the band steel plate.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method of manufacturing a grooved clutch plate.

INDUSTRIAL APPLICATION This invention can be utilized for the manufacturing method of the grooved clutch plate used for the differential limiting device of an automobile, for example.

[Prior Art] Differential devices are known in automobiles. This differential device is
This device absorbs the difference in rotational speed between the left and right drive wheels, allowing the vehicle to run smoothly when changing direction or turning.

In a typical differential gear, the same torque is always transmitted to both left and right drives. Therefore, if one wheel spins in mud or the like and the transmitted torque decreases, the transmitted torque of the other wheel also decreases. Therefore, it becomes impossible to escape. Differential limiting devices are available to improve this drawback.

In this differential limiting device, as is well known, the driving force from the engine is equally transmitted to the shaft, left and right differential large gears, and further transmitted to the left and right wheels.

In the differential limiting device, a predetermined pressing force is applied to the grooved clutch plate. When a differential occurs between the left and right wheels during a turn, friction torque is generated in the grooved clutch plate, this friction torque becomes differential resistance torque, and the transmitted torque of the wheels on the low speed rotation side increases.

A group of grooves is formed on the surface of the above-mentioned grooved clutch plate. This group of grooves is primarily for holding lubricating oil.

By the way, when forming a grooved clutch plate,
Conventionally, there has been a process of degreasing a small square piece-shaped steel plate with a degreasing agent, a process of leveling the surface of the steel plate, a process of forming a film by masking the parts of the surface of the steel plate excluding the parts that will become groove groups, and a process of forming a film. A process of immersing the steel plate in an etching solution to corrode only the parts that are not coated to form grooves, a process of peeling off the coating from the steel plate, and a process of punching the steel plate into a predetermined shape with a die. The process of punching out the board will be performed in sequence.

However, as shown in FIG. 15, in the steel plate that has been etched as described above, the inner part of the groove 104a is eroded and spread laterally than the surface side. In order to retain oil, the deeper the groove 104a is, the better, but when the groove is formed by etching, the deeper the groove, the more likely it is to be eroded laterally. If the inner part of the groove 104a is eroded and spread laterally, the lubricating oil that has entered the groove 104a will be difficult to come out to the surface side, and therefore an oil film will be formed on the surface of the grooved clutch plate. It becomes difficult.

Furthermore, in the etching process, a protrusion 104 is formed on the surface side.
b is likely to occur. When the protruding portion 104b is formed in this manner, it is likely to cause noise (chattering sound) when the grooved clutch plate hesitates to come into contact within the differential limiting device. In order to suppress the protrusion of the protrusion portion 104b as described above,
After the etching treatment, it is preferable to finish roll the groove with a flat roll to make the surface flat as shown in FIG. 16, but the erosion in the lateral direction in the depth direction of the groove remains as it is.

Furthermore, in the above-mentioned manufacturing method, the steel plate is immersed in a tank that stores the etching solution, so due to the limitations on the size of the tank,
There is also a limit to the size of the steel plate, 500 mm x at most.
Approximately 500mm cannot be etched,
Therefore, there is a limit to the number of grooved clutch plates that can be produced from a steel plate, resulting in low productivity. Also, oil cannot be attached to the steel plate for the etching process,
As a result, there was a problem in that the clutch plates were prone to rust.

Therefore, in order to improve the above-mentioned problems, the applicant has recently
A production method for manufacturing a grooved clutch plate by using a protruded roll having a large number of protrusions arranged in rows on the outer periphery, rolling a steel strip with the protruding roll to form a group of grooves in the steel strip. developed.

[Problems to be Solved by the Invention] The present invention is a further improvement of the manufacturing method using the above-described bumped roll.

That is, an object of the present invention is to provide a method for manufacturing a grooved clutch plate that improves the accuracy of the shape of the groove group when rolling the steel band plate with a protruded roll to form the groove group in the steel band plate. .

[Means for Solving the Problems] A method for manufacturing a grooved clutch plate according to the present invention includes a roll with protrusions having a plurality of protrusions arranged in rows at a predetermined pitch on the outer circumference, and a smooth roll having a smooth outer circumference. Using a tension mechanism that pulls the steel strip in the longitudinal direction and a punching die that punches the steel strip into a predetermined shape, the steel strip is compressed in the thickness direction between the outer periphery of the protruded roll and the outer periphery of the smooth roll. A groove forming step in which a group of grooves is formed on one side of the steel strip by continuous rolling with the protruding portion of a protruding roll, and the steel strip with the groove group is conveyed while being pulled by a tensioning mechanism; and a groove forming step. This is a method for manufacturing a grooved clutch plate in which the steps of punching out the steel strip plate that has passed through the rolling process into a predetermined clutch plate shape using a punching die are carried out in order. A direction that brings the roll closer to the smooth roll than the tangential direction of the facing area between the roll and the smooth roll? This is characterized in that the steel strip is pulled by a tensioning mechanism while being tilted.

In the manufacturing method according to the present invention, a butted roll is used.

The protrusion of the protruded roll may be a straight protrusion extending in a direction parallel to the axis of the protruded roll. In some cases, the protrusion may extend in a direction oblique to the axis of the protruded roll. Alternatively, it may be a ring-shaped protrusion extending in the circumferential direction of the protruded roll.

The height and width of the protruding part of the protruded roll are set appropriately depending on the size of the groove to be formed or the material of the steel strip, but generally the height is 0.1
5 to 1.5 Ilt (II, width dimension is 0.15 to 2, ■ m
m.

In the groove forming step, the steel strip located at least on the rolling exit side is tilted in a direction closer to the smooth roll than in the tangential direction of the facing area between the protruding roll and the smooth roll, and the steel strip is pulled by a tensioning mechanism. do. Therefore, the steel strip is inclined at a predetermined angle, for example, about 0.5 to 10 degrees, with respect to the tangential direction of the facing area of the protruded roll and the smooth roll. This angle is appropriately selected depending on the shape and depth of the groove, the material of the steel strip, etc. Note that it is desirable that an angle adjustment mechanism for tilting the steel strip plate at an arbitrary angle is provided.

Note that the groove forming step is generally performed in a cold state. The reason for this is that when a scale film is formed on the surface of the steel strip, the scale film is also rolled and tends to cause scratches on the steel strip, and dimensional accuracy is to be ensured. In addition, in special cases, steel strips are made of 200~
The groove forming process can be performed even in a warm state of about 400°C.

For protruded rolls and smooth rolls, forged steel reels, chilled rolls, sand rolls, grain rolls, hollow rolls, composite rolls, cast steel rolls, etc. can be used, but considering their wear resistance, @steel rolls are used. be able to.

Further, it is preferable that the protruding stripes and the vicinity of the protruding stripes of the protruded roll be heat-treated to make them strong and hardened.

The tensioning mechanism is for pulling the steel strip in its longitudinal direction, and can be formed by, for example, a take-up roll that winds up the steel strip.

The steel strip used in the manufacturing method according to the present invention is selected as necessary, but for example, the steel strip has a carbon content of 0.80 to 0.9.
About 0% by weight, chromium about 0.10 to 0.25% by weight, manganese about 0.20 to 0.40% by weight, silicon 0
．． It can be about 10-0.30% by weight. Specifically, JIS-S. It can be K5. The steel strip has a thickness of 1.0 to 3.0 mm and a width of 50 to 1 mm.
00mIIl.

It is desirable to perform finish rolling after forming the groove group.

In finish rolling, the steel strip is sandwiched between two smooth rolls with smooth outer circumferential surfaces, thereby smoothing the surface of the steel strip after the grooves have been formed.

FIG. 5 shows an enlarged sectional view of a main part of a steel strip formed by the manufacturing method according to the present invention.

Here, FIGS. 7 and 8 according to the present embodiment, and FIGS. 15 and 16 according to the conventional example, respectively, have vertical magnification /
The horizontal magnification is 10/1. Therefore, in Figures 7, 8, 15, and 16, the depth direction is 1 more than the lateral direction.
The illustration is shown at 0x magnification. In this embodiment, as shown in FIG. 8, the inner surface of the groove is formed with a tapered surface in which the groove width dimension L decreases toward the back of the groove. Note that the width of the groove on the surface side is preferably about 0.2 to 1.5 mm. In addition, the curvature R of the surface portion of the groove is 0.05 to 0.
．． The depth of the groove h is preferably about 1 mm.
is preferably 0.08 to Q, about 5 mm.

By the way, once the groove forming step is completed, a punching step is performed in which the steel strip is punched into a predetermined clutch plate shape using a punching die. After punching, it is preferable to remove the particles generated during punching, to impregnate the surface with molybdenum, or to perform a coating treatment to form a phosphate film. If the molybdenum treatment and phosphate coating treatment are performed in this way, the compatibility will be improved when it is incorporated into a differential restriction device.

[Effects of the Invention] According to the manufacturing method of the present invention, in the groove forming step, the steel strip is tilted in a direction closer to the smooth roll than in the tangential direction of the facing area between the protruded roll and the smooth roll. is pulled by a tension mechanism. Therefore, the steel strip is prevented from being wrapped around the protruding roll, and the protruding portion of the protruding roll is easily separated from the groove formed in the steel strip. Therefore, the shape of the groove is less likely to collapse, and the shape of the groove becomes accurate. Furthermore, damage to the protruding portions of the protruded roll can also be suppressed.

According to the manufacturing method according to the present invention, since the clutch plate is not manufactured by etching, protrusions are less likely to be formed on the surface of the groove group, which is effective in suppressing noise (chattering sound).

Furthermore, unlike the case where clutch plates are manufactured by etching, the full width of the grooves forming the groove group tends to become smaller towards the back, as shown in Figure 8.
The inner surface of the groove tends to be a tapered surface where the facing distance becomes smaller toward the back.

Therefore, the lubricating oil that once entered the groove group and was stored becomes more likely to flow along the tapered surface toward the surface side, making it easier to form an oil film on the surface side of the grooved clutch plate, which is therefore effective in suppressing noise (chattering sound). It is.

Since the manufacturing method according to the present invention does not perform etching treatment, the steel strip can be rolled without being limited by the size of the tank that stores the etching solution. Since clutch plates can be punched one after another using a punching die, it is advantageous for improving production efficiency. Furthermore, if oil is used during rolling, the oil will naturally adhere to the steel strip, which is advantageous in preventing rust on the clutch plate.

[Example] An example of the manufacturing method according to the present invention will be described first. This embodiment is a case in which the present invention is used to manufacture a grooved clutch plate for the torque proportional differential limiting device described above.

First, for convenience of explanation, the apparatus used will be explained. As shown in FIG. 1, this device includes a drive type winding opening roll 31 set on the inlet side 30, a driving type winding opening roll 33 set on the exit side 32, and a driving type winding opening roll 33 set on the exit side 32. a driven type backup roll 34, a driven type smooth roll 35, a driven type backup roll 36 that backs up the protruded roll 34, and a driven type backup roll 37 that backs up the smooth roll 35.
a driven type guide roll 3B located on the entrance side 30;
A driven type guide roll 39 located on the exit side 32 is provided. Guide roll 3B and three guide rolls are
The height position can be adjusted using an adjustment mechanism.

As shown in FIG. 2, the protruding roll 34 is provided with a large number of straight protrusions 40 extending in parallel to the axis 34a of the roll 34 and continuous in the circumferential direction at a predetermined pitch. The outer peripheral portion of the smooth roll 35 is smooth.

In the groove forming step, as shown in FIG. The steel strip 2 is rotated in the opposite direction of the arrow T4 while applying force in the direction of the arrow T4, thereby forming the steel strip 2 (
While applying a predetermined tension to JIS-SK5), the steel strip 2 is compressed in the thickness direction and continuously cold-rolled. As a result, lateral grooves u20 as a group of grooves are arranged in a row on the upper surface of the steel strip plate 2. The grooves of the lateral groove group 20 are parallel to each other in a direction substantially perpendicular to the longitudinal direction of the steel strip 2. In addition, in the protruding roll 34,
Roll diameter 150ml, roll body length 300ml,
The rolling torque is about 150 ton-mm, the angular velocity is about 1.7 radian/second, and the contact angle is about 4 degrees. The smooth roll 35 has a roll diameter of 150 mm,
Roll body: 300 mm, rolling torque: 150 tons
-mm, the angular velocity is about 1.7 radian/sec, and the contact angle is about 4 degrees.

By the way, in the process of forming the horizontal groove group 20 described above, the first
As shown in the figure, by adjusting the height positions of the guide roll 38 and the guide roll 39, the direction in which the steel strip 2 is brought closer to the smooth roll 35 than the tangential direction X of the facing area between the protruding roll 34 and the smooth roll 35 While tilting the steel strip 2 in this way, the steel strip 2 is pulled by a winding opening rule 33 serving as a tensioning mechanism. Therefore, the protruding portion 40 of the protruding roll 34 is easily separated from the groove portion of the lateral groove u20 formed on the upper surface of the steel strip plate 2. Therefore, the shape of the lateral grooves in the lateral groove group 20 is less likely to collapse, and the shape of the grooves in the lateral groove group 20 is accurately transferred.

In this embodiment, the protruded roll 34 and the smooth mouth roll 35 are used.
With respect to the tangential direction .

After forming the horizontal grooves W20 as described above, the vertical groove group 21 is formed. That is, in this embodiment, the winding roll 33 on which the steel strip 2 is wound is set on the inlet side 30. Roughly, as shown in FIG. 3, a protruding roll 42 is used in which a large number of ring-shaped protrusions 43 extending in the circumferential direction 42a are arranged in rows in succession at a predetermined pitch in the axial direction. is set in the rolling machine instead of the bumped roll 34.

In this state, the steel strip 2 is pressed in the thickness direction by the protruding rolls 42 and the smooth rolls 35 and is continuously cold rolled. By compressing in this manner, a group of vertical grooves 21 extending in the longitudinal direction of the steel strip 2 is formed on the upper surface of the steel strip 2. When forming the vertical groove group 21 as described above, since the extending direction of the ring-shaped protrusion 43 and the conveyance direction of the steel strip plate 2 are parallel to each other,
The resistance during rolling is also reduced compared to the case where the lateral groove groups 20 are formed. Therefore, the winding of the steel strip 2 around the protruded roll 42 is less than when forming the group of lateral grooves 20, so the inclination angles e1 and e2 of the steel strip 2 are smaller than when forming the group of lateral grooves 20. In some cases, the inclination angles e1 and e2 may be set to zero and the tangential direction X may be maintained. In addition, in the bumped roll 42, the rolling torque is about 150 tons, the angular velocity is about 1.7 radian/second, and the contact angle is about 4 degrees.

Here, the protruding roll 34 for forming the lateral grooves is shown in FIGS. 9 to 11. As shown in FIGS. 9 to 11, in the protruding roll 34, 4. A large number of straight protrusions 40 are formed at a pitch P1 of OIIIm.

The width dimension M1 of this straight protruding portion 40 is 0.7 mm,
The height Q1 is 0.51lIII. The width dimension S1 of this roll 34 is 120 mm, and the diameter D1 is about 150111111.

Also, Figs. 12 to 14 show a protruded roll 42 for forming vertical grooves.
shows. The ring-shaped protrusions 43 formed on the protruded roll 42 have a pitch P2 of 4. 0 mm, the width M2 of the ring-shaped protrusion 43 is <0.7 mm, which is the same as the straight protrusion 40, and the height Q2 is <0.5111 m, which is the same as the straight protrusion 40.

The material of the protruding roll 34 and the protruding roll 42 is JIS-SKD11.

When the groove forming process as described above is carried out, horizontal groove groups 20 and vertical groove groups 21 are continuously formed on the upper surface of the steel strip plate 2, resulting in a lattice-shaped groove as shown in FIG.

After completing the groove forming process as described above, as shown in FIG. 4, a pair of smooth rolls 35 with smooth outer peripheral surfaces,
46, the surface of the steel strip 2 is finish-rolled by sandwiching the steel strip 2 between the pair of smooth-mouthed rules 35, 46.

In this case, the pressing force is approximately 5 to 10 tons. If finish rolling is performed in this way, the surface flatness of the steel strip 2 will be 8th
As shown in the figure, it is greatly improved.

FIGS. 7 and 8 show enlarged cross-sectional views of the vicinity of the grooves of the steel strip 2 according to the manufacturing method of this embodiment as described above. FIG. 7 is a cross-sectional view after performing the groove forming process, and FIG. 8 is a cross-sectional view after performing the groove forming process and the finish rolling process. As shown in FIG. 7, the surface is slightly rounded as a result of the groove forming process, and the depth of the grooves is h2.

As shown in FIG. 8, the radius of curvature R of the portion 200 on the groove surface side of the horizontal groove group 20 and the vertical groove group 21 is 0.02 mm, the depth h is slightly smaller than the h2, and the distance between the grooves U are values corresponding to the bits P1 and P2 described above.

The strip steel plate 2 manufactured as described above is suitably cut into the grooved clutch plate 10 of the differential limiting device using a press die as a punching die.
4 (shown in FIG. 6), and then subjected to deburring treatment and further molybdenum coating treatment. Note that the grooved clutch plate 104 shown in FIG.
4e and a collar portion 104f.

[Other Examples] In the above-mentioned embodiment, when forming the horizontal groove group 20, the steel strip 2 is inclined at an angle of 01 also at the entrance side 30 of rolling, and the steel strip 2 is inclined at an angle of e2 also at the exit side 32 of rolling. However, the present invention is not limited to this, and depending on the groove depth of the lateral groove group 20, the strip steel plate 2 may be
may be set in the tangential direction However, the present invention is not limited to this, and the horizontal groove group 20 may be formed after the vertical groove detail 21 is formed. In this case as well, when forming the horizontal groove group 20, the steel strip 2 is moved in the tangential direction X. It is also possible to pull the sheet by tilting it toward the smooth roll 35 side.

In a special example, not only when forming the horizontal groove group 20 but also when forming the vertical groove group 21, the steel strip 2 can be inclined more toward the smooth roll 35 than the tangential direction X [Application example] The grooved clutch plate 104 manufactured as described above was assembled into a differential limiting device shown in FIG. 17.

As shown in FIG. 17, this differential limiting device includes a housing 100 consisting of a left differential case 100a and a right differential case 100b, a large differential gear (side gear) 101 consisting of a hook gear, and a large differential gear 101 consisting of a hook gear. The differential pinion (
a plurality of grooved clutch plates 1 interposed between the large differential gear 101 and the housing 100;
04 has an inner clutch plate 105 interposed between grooved clutch plates 104 and a pressure ring 106.

In this differential limiting device, driving force from the engine is equally transmitted to the left and right differential large gears 101 via the shaft 102a and the differential small gear 102, and further transmitted to the left and right wheels. When a differential occurs between the left and right wheels during turning, the housing 100 and the large differential gear 101 rotate relative to each other.

At this time, since a pressing force is applied to the grooved clutch plate 104 by a cam mechanism or the like, friction torque is generated, and this friction torque becomes differential resistance torque, increasing the transmission torque of the wheels on the low speed rotation side.

Then I did an actual machine test. In this actual machine test, the chatter noise that tends to occur in conventional clutch plates with grooves formed through etching treatment was effectively prevented. In addition, since a good oil film was not formed on the surface of the clutch plate 104, the clutch plate 104
The lifespan has been improved compared to the previous model.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a schematic front view showing the main steps of the manufacturing method according to the embodiment, and FIG. 2 shows a state in which a rolling process for forming horizontal groove groups is being carried out. Fig. 3 is a perspective view of the main part during the rolling process for forming vertical groove groups, and Fig. 4 is a perspective view of the main part during finish rolling. , FIG. 5 is a plan view of the main part of the steel strip with vertical groove groups and horizontal groove groups formed therein, FIG. 6 is a plan view of the clutch plate after the punching process, and FIG. 7 is the groove forming process. FIG. 8 is an enlarged sectional view of the vicinity of the groove after carrying out the finishing rolling process. FIG. 9 to 11 show a protruding roll forming the horizontal groove group used in this embodiment, FIG. 9 is a front view thereof, and FIG. 10 is a side view with the left half omitted, FIG. 11 is an enlarged sectional view showing the vicinity of the straight protrusion. 12 to 14 show a protruded roll forming a group of longitudinal grooves, FIG. 12 is a front view thereof, FIG. 13 is a side view with the left half omitted, and FIG. 14 is a FIG. 3 is a cross-sectional view of the vicinity of the ring-shaped protruding portion, not shown in an exploded view. FIG. 15 is an enlarged sectional view of the vicinity of the grooves of a grooved clutch plate formed using a conventional etching process;
The figure is an enlarged sectional view of the vicinity of the groove after finish rolling with smooth rolls following the etching process. FIG. 17 is a sectional view of the differential limiting device. In the figure, 34 is a roll with protrusions, 40 is a straight protrusion, 2 is a steel strip, 20 is a group of horizontal grooves, 21 is a group of vertical grooves, 34 is a roll with protrusions, 35 is a smooth roll, and 43 is a ring-shaped protrusion. The parts are shown respectively.

Claims (1)

[Claims] (1) A protruding roll with a large number of protrusions arranged at a predetermined pitch on its outer periphery, a smooth roll with a smooth outer periphery, a tensioning mechanism for pulling the steel strip in the longitudinal direction, and a tensioning mechanism for pulling the steel strip into a predetermined shape. Using a punching die to punch out the protruded roll, the strip is continuously rolled by pressing the strip in the thickness direction between the outer periphery of the protruded roll and the outer circumference of the smooth roll, thereby forming the protruded roll on one side of the strip. A groove forming step in which a group of grooves is formed by the protrusion, and the steel strip on which the group of grooves has been formed is conveyed while being pulled by the tensioning mechanism, and the steel strip that has undergone the groove forming step is shaped into a predetermined clutch plate shape using a punching die. This is a method for manufacturing a grooved clutch plate, which sequentially performs a punching step, and in the groove forming step, a steel strip located at least on the rolling exit side is punched from a tangential direction of a facing area between the protruded roll and the smooth roll. A method for manufacturing a grooved clutch plate, characterized in that the steel strip is pulled by the tensioning mechanism while the steel strip is inclined in a direction approaching the smooth roll.