Punching device and punching method

Abstract

The present disclosure relates to a pressing device and a pressing method in which a control unit of the pressing device stops pressing of a pressing device when the pressing device has displaced by a predetermined size from a point in time when a detection value detected by a pressing force detection unit exceeds a predetermined value.

Description

Technical Field

[0001] The present disclosure relates to an invention for performing a bending process on a tilt angle adjustment ring. Background Art

[0002] For example, in the invention recorded in Japanese Patent Gazette No. 2019-201895, the tilt angle adjustment ring is plastically deformed and forms an annular curved portion to prevent the ratchet from falling off, and the elastic recovery generated after the plastic deformation is used to generate a gap between the curved portion and the ratchet, thereby suppressing interference between the curved portion and the ratchet. Summary of the invention

[0003] However, due to the dimensional deviation of each component, the material property deviation, etc., there may be a situation where an appropriate gap is not generated between the bending portion and the ratchet. In view of this point, the present disclosure discloses an example of a punching device and a punching method.

[0004] The press device for performing bending processing on the tilt angle adjustment ring preferably includes, for example, at least one of the following components.

[0005] That is, the constituent elements are: a punch, which presses the tilt angle adjustment ring; a punch holder, which holds the punch so as to be displaceable in the direction along the pressing direction of the punch; a damper, which exerts elastic force to press the punch along the pressing direction; a pressing die, to which the damper and the punch holder are fixed; a presser, which presses the pressing die along the pressing direction; a control unit, wherein the control panel controls the movement of the presser; and a pressing force detection unit, which detects the pressing force applied by the punch to the tilt angle adjustment ring, and from the moment when the detection value detected by the pressing force detection unit exceeds a predetermined value, when the presser has displaced a predetermined size, the control unit stops the pressing of the presser.

[0006] Furthermore, in the press method for bending the tilt angle adjustment ring, it is preferable to stop pressing by the presser when the presser has displaced by a predetermined dimension from the time when the detection value detected by the pressing force detection unit exceeds a predetermined value.

[0007] Thus, in the punching device and the punching method, since the pressing of the presser is stopped when the pressing die has displaced a predetermined dimension from the moment when the detection value detected by the pressing force detection unit exceeds the predetermined value, it can be expected that appropriate elastic recovery will occur. Therefore, a gap can be generated between the curved portion and the ratchet, and interference between the curved portion and the ratchet can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is an exploded view of the tilt angle adjuster according to the first embodiment.

[0009] Figure 2 It is a diagram showing the structure of the tilt angle adjuster according to the first embodiment.

[0010] Figure 3 It is a diagram showing the structure of the tilt angle adjuster according to the first embodiment.

[0011] Figure 4 It is a figure which shows the press device of 1st Embodiment.

[0012] Figure 5 It is a figure which shows the press device of 1st Embodiment.

[0013] Figure 6 It is a figure which shows the press device of 1st Embodiment.

[0014] Figure 7 It is a graph showing the pressing force (resistance) and the displacement amount (displacement distance) of the pressing mold 140 . DETAILED DESCRIPTION

[0015] Exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings.

[0016] The embodiment described below is an example of an embodiment to show the technical scope of the present disclosure. That is, the technical solutions and the like described in the claims are not limited to the specific structures or configurations shown in the following embodiment.

[0017] This embodiment is an example of applying the punching device and punching method disclosed in the present invention to a seat installed in a vehicle or other transportation tool (hereinafter referred to as a "vehicle seat"). Arrows and oblique lines indicating directions in the drawings are elements of the drawings marked to facilitate understanding of the relationship between the drawings and the shapes of components or parts.

[0018] For components or parts that are at least marked with symbols for explanation, at least one is provided, unless it is stated in advance that "only one" is provided. The punching device shown in the present disclosure includes components or parts such as components marked with symbols for explanation, and at least one of the structural parts shown in the figure.

[0019] (First embodiment)

[0020] <1. Overview of the Tilt Angle Adjuster>

[0021] like Figure 1 As shown, the tilt angle adjuster 1 includes at least a guide member 10, a ratchet 20, an outer peripheral ring 30, and ratchet pawls 41 to 43. That is, the general structure of the tilt angle adjuster 1 is the same as the invention described in Japanese Patent Application Laid-Open No. 2019-201895.

[0022] <Guide Components>

[0023] The guide member 10 is a member fixed to a seat cushion frame (not shown). The seat cushion frame is a member constituting a frame of a seat cushion. The seat cushion is a portion of a vehicle seat for supporting the buttocks of a seated person.

[0024] like Figure 2 As shown, the guide member 10 is a disc-shaped member having a disc-shaped first plate 11 and a first flange portion 12. The first flange portion 12 is a protrusion extending from the outer edge of the first plate 11 in a direction perpendicular to the first plate 11.

[0025] The first flange 12 is formed integrally with the first plate 11 by performing plastic working such as pressing on a metal plate. In addition, a step 13 is formed at the outer edge of the first plate 11 and at a position corresponding to the first flange 12, and the step 13 is recessed toward the first flange 12 side.

[0026] <Ratchet>

[0027] The ratchet 20 is a member fixed to a backrest frame (not shown). The backrest frame is a member of a vehicle seat that constitutes a frame of a seat back. The seat cushion is a portion for supporting the back of a seated person.

[0028] The ratchet 20 is a disc-shaped member, and includes a disc-shaped second plate 21 and a second flange portion 22. The second plate 21 is a portion disposed to face the first plate 11 with a space A1 therebetween.

[0029] like Figure 1 As shown, the second flange portion 22 is a protrusion extending from the entire periphery of the outer edge portion of the second plate 21 toward the first plate 11. The second flange portion 22 is integrally formed with the second plate 21 by performing plastic working such as press working on a metal plate.

[0030] like Figure 2 As shown, a tapered portion 23 is provided at the boundary between the second flange portion 22 and the second plate 21. The tapered portion 23 is provided on the side of the boundary opposite to the space A1, that is, on the outside of the boundary.

[0031] The tapered portion 23 is a portion having a conical shape, and is inclined so as to approach the first plate 11 as it goes radially outward of the ratchet 20. The outer edge 23A of the tapered portion 23 refers to a portion of the tapered portion 23 located most radially outward.

[0032] like Figure 1 As shown, the inner peripheral surface of the second flange 22 is provided with a concavo-convex portion 24 that meshes with the concavo-convex portions 41A to 43A. The concavo-convex portions 41A to 43A are provided on the corresponding pawls 41 to 43, respectively.

[0033] The pawls 41 to 43 are accommodated in the space A1 between the guide member 10 and the ratchet 20. The pawls 41 to 43 are displaceable to be separated from or in contact with the second flange 22. When the concave-convex portions 41A to 43A and the concave-convex portion 24 are meshed with each other, the guide member 10 is in a state of being unable to rotate relative to the ratchet 20.

[0034] <Outer Ring and Others>

[0035] The outer peripheral ring 30 is an example of a tilt angle adjustment ring, which couples the guide member 10 and the ratchet 20. Specifically, the outer peripheral ring 30 restricts the guide member 10 from leaving the ratchet 20 while allowing the guide member 10 to rotate relative to the ratchet 20.

[0036] The hinge cam 44 is a member for displacing the ratchet pawls 41 to 43. When the hinge cam 44 receives an operation force from the outside and rotates, the concavo-convex portions 41A to 43A of the ratchet pawls 41 to 43 are separated from the concavo-convex portion 24.

[0037] When the operating force disappears, the pawls 41 to 43 are displaced to positions where the concave-convex portions 41A to 43A fit into the concave-convex portion 24 by the elastic force of the coil spring 45 , and are then held at the positions by the elastic force.

[0038] <2. Details of the outer ring>

[0039] <2.1 Composition of the outer ring>

[0040] like Figure 3 As shown, the outer ring 30 has an annular ring body 31, a first ring flange portion 32, and a second ring flange portion 33. The outer ring 30 is configured so that its cross-sectional shape is roughly U-shaped or angular U-shaped to sandwich the guide member 10 and the ratchet 20 therein.

[0041] Specifically, the first annular flange portion 32 and the second annular flange portion 33 are portions extending radially inward from the annular body 31. “Extending radially inward” means extending in a direction toward the center of the annular ring body 31.

[0042] The first annular flange portion 32 is located outside the guide member 10 and faces the outer peripheral side (the step portion 13 in this embodiment) of the guide member 10. The second annular flange portion 33 is located outside the ratchet 20 and faces the outer peripheral side (the second flange portion 22 and the tapered portion 23 in this embodiment) of the ratchet 20.

[0043] In addition, the gap between the first annular flange portion 32 and the guide member 10 and the gap between the second annular flange portion 33 and the ratchet 20 are minute, and are less than 1 mm in design median dimensions.

[0044] Therefore, the first annular flange portion 32 can contact the outside of the guide member 10. The second annular flange portion 33 can contact the ratchet 20. The outside is the side opposite to the inside when the space between the guide member 10 and the ratchet 20 is regarded as the inside.

[0045] <3. Method for manufacturing the tilt angle adjuster (particularly the second ring flange)>

[0046] Figure 4 A press device 100 for carrying out the press method of this embodiment is shown. That is, the press device 100 is a device for performing plastic working on the outer peripheral ring 30 to form the second ring flange portion 33 .

[0047] like Figure 4 As shown, the punching device 100 includes at least a punch 110 , a punch holder 120 , a damper 130 , a pressing die (upper die) 140 , a presser 150 , a pressing force detection unit 160 , a control unit 170 , and a receiving die (lower die) 180 .

[0048] <Punch>

[0049] The punch 110 is a member for pressing a portion of the outer ring 30 corresponding to the second ring flange 33. As a result, a portion of the outer ring 30 is plastically deformed to form a portion extending radially inward from the ring body 31, that is, the second ring flange 33.

[0050] In addition, in the present embodiment, a plurality of punches 110 are provided (three punches spaced 120 degrees apart in the present embodiment). That is, the punching device 100 of the present embodiment presses the outer ring 30 at a plurality of locations to form the second ring flange portion 33 .

[0051] <Punch holder, damper>

[0052] The punch holder 120 is arranged in a direction along the pressing direction of the punch 110 (in Figure 4 The damper 130 exerts elastic force to move along the pressing direction (in the vertical direction). Figure 4 The punch 110 is pressed (in the downward direction).

[0053] In addition, a locking portion 121 is provided at the A portion of the punch holder 120, and the locking portion 121 can be locked with the flange portion 111 provided on the punch 110. Therefore, the punch 110 moves in the pressing direction (in Figure 4The displacement (in the downward direction) will not exceed the state where the flange portion 111 and the locking portion 121 are locked.

[0054] In addition, the upper portion of the punch holder 120, that is, the side opposite to the stopper 121, is closed by the pressing die 140. Therefore, the displacement of the punch 110 in the direction opposite to the pressing direction does not exceed the upper end surface of the punch holder 120.

[0055] <Pressing mold, press>

[0056] The pressing die 140 is an upper die having a rigidity that can be regarded as a completely rigid body, and the damper 130 and the punch holder 120 are fixed to the pressing die 140. The presser 150 is a punch that presses the pressing die 140 in a pressing direction.

[0057] The presser 150 of this embodiment is a servo press machine using a servo motor and a ball screw. In addition, the pressing force acting on the outer peripheral ring 30 via the punch 110 is received by the lower die, that is, the receiving die 180.

[0058] <Pressure Detection Section>

[0059] The pressing force detector 160 detects the pressing force applied by the punch 110 to the outer peripheral ring 30 as an example of the tilt angle adjustment ring, that is, the pressing force generated by the presser 150 . A detection signal of the pressing force detector 160 is input to the control unit 170 .

[0060] <Control Unit>

[0061] The control unit 170 is a controller for controlling the operation of the pressing device 150. The control unit 170 is a microcomputer-type controller having a CPU, a ROM (read only memory), and a RAM (random access memory), etc. In addition, software for controlling the operation of the pressing device 150 is stored in a non-volatile memory such as a ROM.

[0062] Moreover, after the punch 110 starts to press the portion of the outer ring 30 corresponding to the second ring flange portion 33, when the detection value detected by the pressing force detection unit 160 exceeds a predetermined threshold value, when the pressing mold 140 has displaced a predetermined dimension (hereinafter referred to as a predetermined dimension), the control unit 170 stops the pressing of the presser 150.

[0063] <Pressing device operation>

[0064] In the state where the pressing device 150 is not in operation (hereinafter referred to as the initial state), as shown in FIG. Figure 4 As shown, the flange portion 111 of the punch 110 is in a state of being locked with the locking portion 121. In addition, the damper 130 exerts a predetermined elastic force in the initial state.

[0065] When the presser 150 is actuated and the pressing die 140 is displaced in the pressing direction, the pressing force of the presser 150 is transmitted to the punch 110 via the damper 130 , so that the outer ring 30 is plastically deformed so that the second ring flange portion 33 approaches the tapered portion 23 .

[0066] At this time, the punch 110 receives resistance from the second ring flange 33, that is, the outer ring 30, and the flange 111 is separated from the locking portion 121, and the separation dimension becomes larger (refer to Figure 5 ).

[0067] Thereafter, when the second ring flange 33 contacts the tapered portion 23, the resistance received by the presser 150 from the outer ring 30 increases sharply. Figure 7 The load inflection point in the above example is used as the above threshold. In addition, Figure 7 It is a graph showing the pressing force (resistance) and the displacement amount (displacement distance) of the pressing mold 140 .

[0068] Afterwards, when the pressing die 140 has been displaced by a predetermined dimension, the control unit 170 stops the pressing of the press 150. In addition, the punch 110 can contact the pressing die 140 at any time after the pressing force of the press 150 reaches the threshold value (see Figure 6 ).

[0069] In addition, after this moment, it becomes Figure 6 After the time of the state shown, the punch 110 is actually displaced integrally with the pressing die 140. That is, after this moment, the force pressing the punch 110 is actually directly transmitted to the punch 110 without passing through the damper 130.

[0070] In addition, it is also clear from the above-mentioned operation description that the elastic force generated by the damper 130 in the initial state must be at least large enough to cause the second ring flange portion 33 to undergo plastic deformation.

[0071] Furthermore, after this moment, the force pressing the punch 110 is directly transmitted to the punch 110 without passing through the damper 130 , and thus the elastic force generated by the damper 130 does not substantially increase after this moment.

[0072] <4. Features of the Pressing Device and Pressing Method of the Present Embodiment>

[0073] In the stamping device 100 and the stamping method, since the pressing of the presser 150 is stopped when the pressing die 140 has displaced a predetermined dimension from the moment the detection value detected by the pressing force detection unit 160 exceeds the threshold, it can be expected that appropriate elastic recovery will occur in the second ring flange portion 33.

[0074] That is, the control unit 170 only needs to press the punch 110 to cause plastic deformation of the outer ring 30 until the detection value exceeds the threshold value, that is, until the second ring flange portion 33 contacts the tapered portion 23 and the resistance increases sharply.

[0075] Furthermore, “the second annular flange 33 contacts the tapered portion 23 to increase resistance sharply” is not affected by dimensional variations of the components. In other words, “the time when the detection value detected by the pressing force detector 160 exceeds the threshold” is not affected by dimensional variations of the components.

[0076] Therefore, if the pressing die 140 is displaced by a predetermined dimension from the moment when the detection value exceeds the threshold, the pressing of the presser 150 is stopped, an appropriate gap can be generated between the second annular flange 33 and the ratchet 20. Furthermore, interference between the second annular flange 33 and the ratchet 20 can be suppressed.

[0077] (Other embodiments)

[0078] In the above embodiment, the resistance when the resistance increases sharply ( Figure 7 The load inflection point in the load inflection point is used as the above threshold. However, the present disclosure is not limited to this. That is, the present disclosure can be configured to use, for example, a value calculated by increasing or decreasing a predetermined load relative to the load inflection point as the above threshold.

[0079] Furthermore, the present disclosure is not limited to the above-mentioned embodiments as long as it complies with the disclosure of the above-mentioned embodiments. Therefore, the present disclosure may be, for example, a configuration that combines at least two of the above-mentioned multiple embodiments, or may be a configuration that abolishes any of the illustrated constituent elements or constituent elements that are described by marking symbols in the above-mentioned embodiments.

Claims

1. A punching device for performing bending processing on a tilt angle adjustment ring, wherein the punching device is characterized in that it comprises: a punch configured to press the tilt angle adjustment ring; a punch holder for holding the punch displaceably in a direction along a pressing direction of the punch; a damper configured to exert an elastic force to press the punch along the pressing direction; A pressing die, wherein the damper and the punch holder are fixed to the pressing die; A presser, the presser being configured to press the pressing mold along the pressing direction; a control unit, wherein the control panel is configured to control the action of the presser; and a pressing force detection portion configured to detect a pressing force applied by the punch to the tilt angle adjustment ring, and The control unit stops pressing by the presser when the presser has displaced by a predetermined amount since the detection value detected by the pressing force detection unit exceeds a predetermined value.

2. A punching method for performing bending processing on a tilt angle adjustment ring, wherein the punching method comprises using a punching device having the following components, namely, a punch configured to press the tilt angle adjustment ring; a punch holder for holding the punch displaceably in a direction along a pressing direction of the punch; a damper configured to exert an elastic force to press the punch along the pressing direction; A pressing die, wherein the damper and the punch holder are fixed to the pressing die; A presser configured to press the pressing mold along the pressing direction; and a pressing force detection portion configured to detect a pressing force applied by the punch to the tilt angle adjustment ring, and When the pressing tool has been displaced by a predetermined amount from the time when the detection value detected by the pressing force detection unit exceeds a predetermined value, the pressing by the pressing tool is stopped.

Images