Press device and press method

Abstract

To disclose an example of a press device and a press method that are resistant to the influence of dimensional variations of respective components and property variations of materials.SOLUTION: A control unit 170 stops the pressing by a presser 150 when a pressing die 140 is displaced by a prescribed dimension after a detection value detected by a pressing force detection unit 160 exceeds a threshold. With this, it can be expected that appropriate springback occurs in a second ring flange part. Therefore, since an appropriate gap can be generated between the second ring flange part and a ratchet, the occurrence of interference between the second ring flange part and the ratchet can be suppressed.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to an invention for performing bending of a recliner ring. [Background technology]

[0002] For example, in the invention described in Patent Document 1, the recliner ring is plastically deformed to form a ring-shaped bent portion that prevents the ratchet from falling off, and the springback that occurs after plastic deformation is utilized to create a gap between the bent portion and the ratchet, thereby suppressing interference between the bent portion and the ratchet. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-201895 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, there may be cases where an appropriate gap is not formed between the bent portion and the ratchet due to dimensional variations in each part, variations in material properties, etc. The present disclosure discloses an example of a pressing device and a pressing method in consideration of this point. [Means for solving the problem]

[0005] It is desirable that the press device for bending the recliner ring (30) has at least one of the following components, for example. That is, the constituent elements include a punch (110) that presses the recliner ring (30), a punch holder (120) that holds the punch (110) so that the punch (110) can be displaced in the pressing direction of the punch (110), a damper (130) that exerts an elastic force that presses the punch (110) in the pressing direction, a pressing die (140) to which the damper (130) and the punch holder (120) are fixed, and a pressing member that presses the pressing die (140) in the pressing direction. The apparatus includes a pressurizer (150), a control unit (170) for controlling the operation of the pressurizer (150), and a pressing force detection unit (160) for detecting the pressing force applied by the punch (110) to the recliner ring (30), and the control unit (170) stops the pressing by the pressurizer (150) when the pressing mold (140) is displaced by a predetermined dimension after the detection value detected by the pressing force detection unit (160) exceeds a predetermined value.

[0006] In addition, in the pressing method for bending the recliner ring (30), it is desirable to stop the pressing by the pressing device (150) when the detection value detected by the pressing force detection unit (160) exceeds a predetermined value and the pressing die (140) is displaced by a predetermined dimension.

[0007] As a result, in the pressing device and pressing method, the pressing by the pressing device (150) is stopped when the detection value detected by the pressing force detection unit (160) exceeds a predetermined value and the pressing die (140) is displaced by a predetermined dimension, so that appropriate pulling back can be expected. Therefore, it is possible to generate a gap between the bent portion and the ratchet, and therefore interference between the bent portion and the ratchet can be suppressed.

[0008] Incidentally, the symbols in the above parentheses are examples showing the corresponding relationship with the specific configurations etc. described in the embodiments described below, and the present disclosure is not limited to the specific configurations etc. shown by the symbols in the above parentheses. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is an exploded view of the recliner according to the first embodiment. [Diagram 2] 1A and 1B are diagrams illustrating a structure of a recliner according to a first embodiment. [Diagram 3] 1A and 1B are diagrams illustrating a structure of a recliner according to a first embodiment. [Figure 4] FIG. 1 is a diagram showing a press device according to a first embodiment. [Diagram 5] FIG. 1 is a diagram showing a press device according to a first embodiment. [Figure 6] FIG. 1 is a diagram showing a press device according to a first embodiment. [Figure 7] 13 is a graph showing the relationship between the pressing force (resistance force) and the amount of displacement of the pressing mold 140. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The following "embodiment of the invention" shows an example of an embodiment that falls within the technical scope of the present disclosure. In other words, the invention-specific matters described in the claims are not limited to the specific configurations and structures shown in the following embodiment.

[0011] This embodiment is an example in which the pressing device and pressing method according to the present disclosure are applied to a recliner used in a seat (hereinafter referred to as a vehicle seat) mounted on a vehicle such as a car. Arrows and diagonal lines indicating directions are provided in each figure to facilitate understanding of the relationships between the figures and the shapes of components or parts.

[0012] At least one of each of the components or parts described with a reference number is provided, unless otherwise specified by "one" or the like. The press device shown in the present disclosure includes at least one of the components such as the components or parts described with a reference number and the structural parts shown in the drawings.

[0013] (First embodiment) <1. Overview of the recliner> 1, the recliner 1 at least includes a guide member 10, a ratchet 20, an outer peripheral ring 30, and poles 41 to 43. In other words, the schematic configuration of the recliner 1 is the same as that of the invention described in Patent Document 1.

[0014] <Guide parts> The guide member 10 is a member that is fixed to a cushion frame (not shown). The cushion frame is a member that constitutes the framework of the seat cushion. The seat cushion is a portion that supports the buttocks of a seated person.

[0015] 2, the guide member 10 is a dish-shaped member having a disk-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.

[0016] The first flange portion 12 is formed integrally with the first plate 11 by applying plastic processing such as pressing to a metal plate. A stepped portion 13 recessed toward the first flange portion 12 is formed on the outer edge of the first plate 11 at a location corresponding to the first flange portion 12.

[0017] <Ratchet> The ratchet 20 is a member that is fixed to a back frame (not shown). The back frame is a member that constitutes the framework of the seat back. The seat back is a portion that supports the back of a seated occupant.

[0018] The ratchet 20 is a dish-shaped member having a disk-shaped second plate 21 and a second flange portion 22. The second plate 21 is a portion disposed opposite to the first plate 11 across a space A1.

[0019] 1, the second flange portion 22 is a protrusion extending from the entire outer edge portion of the second plate 21 toward the first plate 11. The second flange portion 22 is formed integrally with the second plate 21 by applying plastic processing such as pressing to a metal plate.

[0020] 2, 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.

[0021] The tapered portion 23 is a conically tapered portion that is inclined so as to approach the first plate 11 as it approaches the radial outside of the ratchet 20. Note that the outer edge 23A of the tapered portion 23 refers to the portion of the tapered portion 23 that is located most radially outward.

[0022] 1, the inner circumferential surface of the second flange portion 22 is provided with uneven portions 24 that mesh with the uneven portions 41A to 43A. The uneven portions 41A to 43A are provided on the poles 41 to 43, respectively.

[0023] The poles 41 to 43 are housed in a space A1 sandwiched between the guide member 10 and the ratchet 20. The poles 41 to 43 are displaceable toward and away from the second flange portion 22. When the concave-convex portions 41A to 43A are engaged with the concave-convex portion 24, the guide member 10 is unable to rotate relative to the ratchet 20.

[0024] <Outer ring and others> The outer circumferential ring 30 is an example of a recliner ring, and connects the guide member 10 and the ratchet 20. Specifically, the outer circumferential ring 30 restricts the guide member 10 from moving away from the ratchet 20 while allowing the guide member 10 to rotate relative to the ratchet 20.

[0025] The hinge cam 44 is a member for displacing the poles 41 to 43. When the hinge cam 44 receives an external operating force and rotates, it moves the concave-convex portions 41A to 43A of the poles 41 to 43 away from the concave-convex portion 24.

[0026] When the operating force disappears, the poles 41 to 43 are displaced by the elastic force of the spiral spring 45 to positions where the concave-convex portions 41A to 43A fit into the concave-convex portion 24, and are then held in those positions by the elastic force.

[0027] <2. Details of the outer ring> <2.1 Outer ring structure> As shown in Figure 3, the outer ring 30 has an annular ring body 31, a first ring flange portion 32 and a second ring flange portion 33, and is configured with an approximately U-shaped or C-shaped cross-sectional shape that sandwiches the guide member 10 and the ratchet 20.

[0028] Specifically, the first ring flange portion 32 and the second ring flange portion 33 are portions that extend radially inward from the ring body 31. "Extending radially inward" means that they extend in a direction toward the center of the annular ring body 31.

[0029] The first ring flange portion 32 faces the outer peripheral side of the guide member 10 (in this embodiment, the stepped portion 13) on the outside of the guide member 10. The second ring flange portion 33 faces the outer peripheral side of the ratchet 20 (in this embodiment, the second flange portion 22 and the tapered portion 23) on the outside of the ratchet 20.

[0030] The gap between the first ring flange portion 32 and the guide member 10, and the gap between the second ring flange portion 33 and the ratchet 20 are extremely small, less than 1 mm in the design center dimension.

[0031] Therefore, the first ring flange portion 32 can come into contact with the outside of the guide member 10. The second ring flange portion 33 can come into contact with the ratchet 20. When the space between the guide member 10 and the ratchet 20 is defined as the inside, the outside refers to the side opposite the inside.

[0032] <3. Manufacturing method of the recliner (particularly, the second ring flange portion)> 4 shows a press device 100 for carrying out the press method according to this embodiment. That is, the press device 100 is a device for forming the second ring flange portion 33 by performing plastic working on the outer peripheral ring 30.

[0033] As shown in FIG. 4, the press device 100 is configured to include at least a punch 110, a punch holder 120, a damper 130, a pressing die (upper die) 140, a pressing device 150, a pressing force detection unit 160, a control unit 170, and a receiving die (lower die) 180.

[0034] <Punch> The punch 110 is a member that presses a portion of the outer peripheral ring 30 that corresponds to the second ring flange portion 33. As a result, a portion of the outer peripheral ring 30 is plastically deformed to form a portion that extends radially inward from the ring body 31, i.e., the second ring flange portion 33.

[0035] In this embodiment, a plurality of punches 110 (three at 120 degree intervals in this embodiment) are provided. That is, the press device 100 according to this embodiment presses the outer peripheral ring 30 at a plurality of points to form the second ring flange portion 33.

[0036] <Punch holder, damper> The punch holder 120 is a member that holds the punch 110 so as to be displaceable in the pressing direction (up and down direction in FIG. 4) of the punch 110. The damper 130 exerts an elastic force that presses the punch 110 in the pressing direction (downward in FIG. 4).

[0037] Incidentally, the portion A of the punch holder 120 is provided with a locking portion 121 that can be locked to a brim-shaped flange portion 111 provided on the punch 110. Therefore, the punch 110 does not move in the pressing direction (downward in FIG. 4) beyond a state in which the flange portion 111 is locked to the locking portion 121.

[0038] Moreover, the upper part of the punch holder 120, i.e., the side opposite to the locking part 121, is in a state of being blocked by the pressing die 140. Therefore, the punch 110 does not move beyond the upper end surface of the punch holder 120 in the direction opposite to the pressing direction.

[0039] <Pressing type, pressing device> The pressing die 140 is an upper die having such rigidity that it can be regarded as a completely rigid body to which the damper 130 and the punch holder 120 are fixed. The pressing device 150 is a press machine that presses the pressing die 140 in the pressing direction.

[0040] The pressing device 150 according to this embodiment is a servo press machine that uses a servo motor and a ball screw. The pressing force acting on the outer peripheral ring 30 via the punch 110 is received by a receiving die 180, which is a lower die.

[0041] <Pressure detection unit> The pressing force detection unit 160 detects the pressing force that the punch 110 applies to the recliner ring 30, that is, the pressing force generated by the presser 150. A detection signal from the pressing force detection unit 160 is input to the control unit 170.

[0042] <Control Unit> The control unit 170 is a controller that controls the operation of the pressing device 150. The control unit 170 is a microcomputer type controller having a CPU, a ROM, a RAM, etc. Note that software for controlling the operation of the pressing device 150 is stored in a non-volatile storage unit such as a ROM.

[0043] Then, after punch 110 starts to press the area corresponding to second ring flange portion 33, control unit 170 stops the pressing by presser 150 when the detection value detected by pressing force detection unit 160 exceeds a predetermined threshold value and pressing mold 140 is displaced by a predetermined dimension (hereinafter referred to as the specified dimension).

[0044] <Operation of the press device> In a state where the pressing device 150 is not in operation (hereinafter referred to as the initial state), the flange portion 111 of the punch 110 is engaged with the engaging portion 121 as shown in Fig. 4. In the initial state, the damper 130 exerts a predetermined elastic force.

[0045] When the presser 150 is activated 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, and the outer ring 30 undergoes plastic deformation so that the second ring flange portion 33 approaches the tapered portion 23.

[0046] At this time, the flange portion 111 of the punch 110 moves away from the locking portion 121 due to the resistance force received from the second ring flange portion 33, that is, the outer peripheral ring 30, and the distance between them increases (see FIG. 5).

[0047] Thereafter, when the second ring flange portion 33 comes into contact with the tapered portion 23, the resistance force that the pressing tool 150 receives from the outer peripheral ring 30 increases suddenly. In this embodiment, the resistance force at which the resistance force increases suddenly (the load inflection point in FIG. 7) is used as the threshold value. FIG. 7 is a graph showing the pressing force (resistance force) and the amount of displacement of the pressing mold 140.

[0048] Thereafter, the control unit 170 stops the pressing by the pressing device 150 when the pressing die 140 is displaced by a predetermined dimension. Note that, at any time after the pressing force of the pressing device 150 reaches the threshold value, the punch 110 may come into contact with the pressing die 140 (see FIG. 6).

[0049] 6, the punch 110 is virtually displaced integrally with the pressing die 140. In other words, the force pressing the punch 110 is virtually transmitted to the punch 110 directly, without passing through the damper 130, after the timing.

[0050] Incidentally, as is clear from the above operation description, the elastic force generated by the damper 130 in the initial state must be at least large enough to plastically deform the second ring flange portion 33.

[0051] Furthermore, after this timing, the force pressing the punch 110 is transmitted directly to the punch 110 without passing through the damper 130, so that after this timing, the elastic force generated by the damper 130 does not actually increase.

[0052] <4. Features of the Pressing Apparatus and Pressing Method According to the Present Embodiment> In the press apparatus 100 and the press method, the pressing by the presser 150 is stopped when the detection value detected by the pressing force detection unit 160 exceeds a threshold value and the pressing mold 140 is displaced a predetermined dimension, so that appropriate pulling back can be expected to occur in the second ring flange portion 33.

[0053] In other words, the control unit 170 simply presses the punch 110 to plastically deform the outer ring 30 until the detection value exceeds the threshold value, that is, until the second ring flange portion 33 comes into contact with the tapered portion 23 and the resistance force increases suddenly.

[0054] And, "the sudden increase in resistance force due to contact of second ring flange portion 33 with tapered portion 23" is not affected by dimensional variations of each component, etc. In other words, "when the detection value detected by pressure detection portion 160 exceeds the threshold value" is not affected by dimensional variations of each component, etc.

[0055] Therefore, if the pressing by the pressing device 150 is stopped when the pressing die 140 is displaced by a predetermined dimension from when the detection value exceeds the threshold value, it is possible to generate an appropriate gap between the second ring flange portion 33 and the ratchet 20. In turn, it is possible to suppress the occurrence of interference between the second ring flange portion 33 and the ratchet 20.

[0056] (Other embodiments) In the above embodiment, the resistance force at which the resistance force increases suddenly (the load inflection point in FIG. 7) is used as the threshold value. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that, for example, a value obtained by adding or subtracting a predetermined load to or from the load inflection point is used as the threshold value.

[0057] Furthermore, the present disclosure is not limited to the above-mentioned embodiments as long as it is consistent with the gist of the disclosure described in the above-mentioned embodiments. Therefore, the present disclosure may be a configuration in which at least two of the above-mentioned embodiments are combined, or a configuration in which any of the components illustrated or the components described with reference numerals in the above-mentioned embodiments are eliminated. [Explanation of symbols]

[0058] 1. Recliner 100... Press equipment 110... Punch 111... Flange part 120…Punch holder 121... Locking part 130…Damper 140... Press type 150… Presser 160... Pressure detection unit 170... Control section

Claims

1. A press device for bending a recliner ring, A punch that presses the recliner ring; a punch holder that holds the punch so as to be displaceable in a pressing direction of the punch; a damper that exerts an elastic force to press the punch in a pressing direction; a pressing die to which the damper and the punch holder are fixed; A pressing device that presses the pressing mold in the pressing direction; A control unit for controlling the operation of the pressing device; a pressing force detection unit that detects a pressing force applied to the recliner ring by the punch, The control unit of the press device stops the pressing by the presser when the pressing mold is displaced by a predetermined dimension after the detection value detected by the pressing force detection unit exceeds a predetermined value.

2. A press method for bending a recliner ring, comprising: A punch that presses the recliner ring; a punch holder that holds the punch so as to be displaceable in a pressing direction of the punch; a damper that exerts an elastic force to press the punch in a pressing direction; a pressing die to which the damper and the punch holder are fixed; A pressing device that presses the pressing mold in the pressing direction; a pressing force detection unit that detects the pressing force applied by the punch to the recliner ring, The pressing method includes stopping the pressing by the pressing device when the pressing die is displaced by a predetermined dimension after the detection value detected by the pressing force detection unit exceeds a predetermined value.

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