Blank rotation holding device and blank holding unit

Abstract

A rotary blank holding device (S) is configured to include a motor (M), a pressing machine (P), and a blank holding unit (U) including a motor-side holder and a pressing machine-side holder, the blank holding unit (U) being configured to hold a blank by using a pressing force toward a first side in an axial direction output from a pressing machine shaft. The end surfaces on both sides in the axial direction of the blank are sandwiched by a motor-side holder and a pressure-machine-side holder, and the motor-side holder and the pressure-machine-side holder include a fixed portion, a moving portion, and a main body elastic portion.

Description

Technical Field

[0001] This application claims priority based on Japanese Patent Application No. 2024-050094, filed on March 26, 2024, the entire contents of which are incorporated herein by reference.

[0002] This invention relates to a billet rotation holding device and a billet holding unit. Background Technology

[0003] Conventionally, as a device for holding a billet (billet, cylindrical workpiece) while rotating it, there are devices that hold the outer peripheral surface of the billet by means of multiple chucks (clamps) arranged on the outer peripheral side of the billet (for example, Patent Document 1).

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Implementation License No. 57-96731 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] However, when using the existing device as described above, space is required on the outer periphery of the billet for holding the aforementioned multiple claws. Therefore, this device may not be suitable when it is difficult to ensure space on the outer periphery of the billet.

[0009] On the other hand, as another method of rotating the billet while holding it, holding both ends of the billet can be considered. However, in general, since high precision is not required for the shape of the billet, the end faces (cut surfaces) of the billet are usually not perpendicular to the central axis of the billet. In general, they are inclined non-perpendicularly to the central axis of the billet. Even so, it is difficult to rotate the billet while holding both ends of the billet firmly.

[0010] The present invention is proposed to solve the above-mentioned problems, and its purpose is to provide a billet rotation holding device and a billet holding unit, which can stably hold both ends of the billet while rotating the billet, even when the end face of the billet is tilted.

[0011] Methods for solving problems

[0012] [1] A billet rotation holding device, configured to hold a billet while rotating the billet, comprising: An electric motor, having a motor shaft; A press, having a press shaft disposed opposite to the motor shaft in the axial direction; and billet holding unit The blank holding unit includes: A motor-side retainer, mounted on the motor shaft, configured to retain the end face of the blank on a first side in the axial direction; and A press-side retainer, mounted on the press shaft, is configured to retain the end face of the billet on the second side in the axial direction. The press is configured to output pressure toward a first side in the axial direction via the press shaft. The billet holding unit is configured to clamp the end faces of the billet on both sides of the axial direction using the pressure output from the press shaft toward the first side of the axial direction, via the motor-side holding member and the press-side holding member. The motor-side retainer and the compressor-side retainer are respectively configured to include: The fixing part is configured to be fixed to the motor shaft or the press shaft and has an internal space that is open at least on the blank side in the axial direction; A movable portion, configured to move along the axial direction within the internal space of the fixed portion, and configured to transmit rotational torque with the fixed portion, has a retaining surface on the blank side in the axial direction, the retaining surface being configured to retain an end face of the blank on a first side or a second side in the axial direction; and The main elastic part is composed of one or more disc springs, which are arranged approximately coaxially with the fixed part within the internal space of the fixed part between the fixed part and the moving part.

[0013] [2] According to the billet rotation holding device described in [1], the motor-side holding member and the press-side holding member are respectively configured as follows: The outer peripheral surface of the movable part has multiple engaging portions, which are respectively arranged in a convex or concave shape in the radial direction and are arranged circumferentially. The inner circumferential surface that divides the internal space in the fixing part has a plurality of engaging portions, which are respectively arranged in a concave or convex shape in the radial direction, arranged circumferentially, and engaging with the plurality of engaging portions. By engaging the plurality of engaging parts with the plurality of engaged parts, rotational torque can be transmitted between the fixed part and the movable part.

[0014] [3] The blank rotation holding device according to [1] or [2], wherein the holding surface of the motor side holding member has concave strips and convex strips that extend approximately radially and are alternately arranged circumferentially.

[0015] [4] According to the billet rotation holding device of [3], the protruding front edge of each of the convex bars on the axial direction of the billet side extends toward the opposite side of the axial direction of the billet as it moves toward the radially inward side.

[0016] [5] The billet rotation holding device according to [3] or [4], wherein the motor-side holding member has a push-out portion, the push-out portion being configured such that when the force applied from the billet to the holding surface toward the first side in the axial direction is below a predetermined value, the push-out portion protrudes toward a second side in the axial direction that is closer to the holding surface than the holding surface, pushing the billet toward the second side in the axial direction.

[0017] [6] The billet rotation holding device according to any one of [1] to [5], further comprising a magnetic field generating device configured to generate a magnetic field in a specified working space. The billet rotation holding device is configured to rotate the billet while holding it within the specified working space, and to generate a magnetic field in the specified working space using the magnetic field generator, during which the billet is heated by an induced current flowing within it.

[0018] [7] The billet holding unit is configured for use in any one of [1] to [6] as a billet rotation holding device.

[0019] Invention Effects

[0020] According to the present invention, a billet rotation holding device and a billet holding unit can be provided, which can rotate the billet while steadily holding both ends of the billet, even when the end face of the billet is tilted. Attached Figure Description

[0021] Figure 1 This is a schematic perspective view of a billet rotation holding device according to an embodiment of the present invention, which includes a billet holding unit according to an embodiment of the present invention.

[0022] Figure 2 It is shown schematically. Figure 1 A perspective view of the motor-side retainer.

[0023] Figure 3 The diagram schematically illustrates the state (natural state) under which no force from the blank is applied to the retaining surface, through a cross-section along the central axis of the motor-side retainer. Figure 2 A cross-sectional view of the motor-side retainer along the axial direction.

[0024] Figure 4 This is used to describe when a force from the billet is applied to the holding surface. Figure 2A diagram illustrating the operation of the motor-side retainer.

[0025] Figure 5 By along Figure 3 The cross section of line AA is schematically shown. Figure 3 A cross-sectional view of the motor-side retainer perpendicular to the axis.

[0026] Figure 6 It is shown schematically. Figure 1 A perspective view of the retaining component on the side of the pressurizer.

[0027] Figure 7 This schematically represents the state (natural state) where no force is applied from the billet on the holding surface, as shown by a cross-section along the central axis of the press-side retainer. Figure 6 A sectional view along the axis of the compressor-side retainer.

[0028] Figure 8 By along Figure 7 The cross-section of line BB is schematically shown. Figure 7 A cross-sectional view of the press side retainer perpendicular to the axis.

[0029] Figure 9 It is used to explain the basis Figures 1 to 8 The diagram illustrates the effect of the billet rotation holding device and the billet holding unit according to the embodiment.

[0030] Figure 10 This is an explanatory diagram illustrating a billet rotation holding device and a billet holding unit according to a variation of the present invention. Detailed Implementation

[0031] The billet rotation holding device and billet holding unit according to the present invention can be used for any purpose, such as a billet heating device for heating billets (e.g., aluminum billets).

[0032] Hereinafter, embodiments of the billet rotation holding device and billet holding unit of the present invention will be described by way of example with reference to the accompanying drawings.

[0033] Figure 1 This is a schematic diagram illustrating a billet rotation holding device S according to one embodiment of the present invention. The billet rotation holding device S is configured to hold a billet (cylindrical workpiece) B while rotating the billet B. Figure 1 This indicates that the billet rotation holding device S holds the billet B in its current state.

[0034] Blank B is preferably made of metal, such as aluminum. Blank B in Figure 1 The example is roughly cylindrical, but it can also be other cylindrical shapes.

[0035] exist Figure 1 In one embodiment, the billet rotation holding device S includes a motor M, a press P, and a billet holding unit U according to one embodiment of the present invention. The billet holding unit U includes a motor-side holding member HM and a press-side holding member HP (in this example, the billet holding unit U is composed of the motor-side holding member HM and the press-side holding member HP).

[0036] According to this embodiment, the billet holding unit U is configured as a billet rotation holding device S that can be used in any embodiment of the present invention.

[0037] As described below, the billet rotation holding device S is located between the motor shaft MS of the motor M and the press shaft PS of the press P, and rotates the billet B by clamping the end faces Bf on both sides of the billet B through the billet holding unit U.

[0038] The electric motor (M) has a motor shaft MS. The motor shaft MS is the drive shaft (output shaft) that outputs rotational torque.

[0039] The electric motor M can have any structure; for example, it can have any known structure of an electric motor.

[0040] As in Figure 1 As indicated by the arrows, in this specification, for ease of explanation, the billet B will be held in the state where the billet rotation holding device S holds the billet ( Figure 1 The direction parallel to the central axis MSO of the motor shaft MS is called the "axial direction AD". Furthermore, one side of the axial direction AD is called the "first side AD1 of the axial direction", and the other side is called the "second side AD2 of the axial direction". Additionally, the side of the axial direction AD closer to the blank B is called the "blank side ADB of the axial direction", and the side of the axial direction AD farther from the blank B is called the "opposite side ADA of the axial direction". Furthermore, the direction perpendicular to the axial direction AD is called the "vertical direction of the axial direction". In this specification, the circumferential direction centered on the central axis MSO (or its extension) of the motor shaft MS is sometimes simply referred to as the "circumferential direction". Furthermore, unless otherwise stated, the terms "outer circumferential side" and "inner circumferential side" refer to the outer circumferential side and the inner circumferential side, respectively, centered on the central axis MSO (or its extension) of the motor shaft MS.

[0041] In addition, in this specification, the direction perpendicular to the axial direction AD is referred to as "longitudinal VD", and the directions perpendicular to both the axial direction AD and longitudinal VD are referred to as "depth direction DD". Furthermore, one side of longitudinal VD is referred to as "longitudinal first side VD1", and the other side of longitudinal VD is referred to as "longitudinal second side VD2".

[0042] Although in this embodiment, the longitudinal direction VD points to the vertical direction, the longitudinal first side VD1 points to the upper side, and the axial direction AD and the depth direction DD are parallel to the horizontal direction, the longitudinal first side VD1 (and other directions) can point to any direction.

[0043] like Figure 1 As shown, the press P has a press shaft PS. The press shaft PS is configured to be opposite the motor shaft MS in the axial direction AD. The front ends of the motor shaft MS and the front ends of the press shaft PS are separated and opposite each other in the axial direction AD. The motor shaft MS and the press shaft PS are preferably configured such that their respective central axes MSO and HPO are located on approximately the same straight line. The motor M and the press P can be adjusted in height and position by being respectively mounted on support platforms TA, TC, etc.

[0044] The press P is configured to output pressure toward the first side AD1 in the axial direction via the press shaft PS. The press shaft PS is configured to be able to displace along the axial direction AD, and is configured to output pressure toward the first side AD1 in the axial direction while displacing it.

[0045] The press shaft PS is configured as the driven shaft. That is, the press P is configured such that, with the billet B held by the billet rotation holding device S ( Figure 1 The press shaft PS outputs the aforementioned pressure while rotating together with the billet holding unit U and the billet B, through the rotational torque output from the motor shaft MS.

[0046] The specific structure of the press P can be arbitrary. For example, the press P can be configured to displace the press shaft PS along the axial direction AD and output pressure by means of an electric or hydraulic structure. The press P can be automatically controlled, for example, by a processing device (CPU, circuit device, etc.) that performs various processes according to a prescribed program stored in any storage device (ROM, RAM, etc.), or it can operate in response to human operation.

[0047] By applying pressure from the press shaft PS toward the first side AD1 in the axial direction, the billet B is more securely held between the motor shaft MS and the press shaft PS via the billet holding unit U, thus preventing the billet B from deviating or misaligning from the billet rotation holding device S.

[0048] The billet holding unit U consists of a motor-side holder HM and a press-side holder HP. Figure 1 ).

[0049] The motor-side retainer HM (also referred to as "retainer HM") is configured to be mounted on the motor shaft MS. The motor-side retainer HM is configured to retain the end face Bf of the first side AD1 in the axial direction of the blank B when mounted on the motor shaft MS.

[0050] The press-side retainer HP (also referred to as "retainer HP") is configured to be mounted on the press shaft PS. The press-side retainer HP is configured to retain the end face Bf of the second side AD2 in the axial direction of the billet B when mounted on the press shaft PS.

[0051] With the motor-side retainer HM mounted on the motor shaft MS and the press-side retainer HP mounted on the press shaft PS, the motor-side retainer HM and the press-side retainer HP are opposite each other in the axial direction AD. Figure 1 ).

[0052] The billet holding unit U is configured such that the end faces Bf of the billet B on both sides of the axial direction AD are clamped by the motor-side holding member HM and the press-side holding member HP using the pressure output from the press shaft PS toward the first side AD1 in the axial direction.

[0053] exist Figure 1 In this embodiment, the billet rotation holding device S is configured as a billet heating device to heat the billet B. The billet rotation holding device S also includes a magnetic field generating device J. The magnetic field generating device J is configured to generate a magnetic field in a specified working space J6. In this embodiment, the billet rotation holding device S is configured to: hold the billet B within the specified working space J6 using a motor M, a press P, and a billet holding unit U, while rotating (self-rotating) the billet B, and generate a magnetic field in the specified working space J6 using the magnetic field generating device J. During this process, the billet B is heated by an induced current flowing through it. The billet B heated by the billet rotation holding device S is then transported, for example, to processing machinery such as an extruder for extrusion processing or other processing.

[0054] The height and position of the magnetic field generator J can be adjusted by setting it on the support platform TB, etc.

[0055] The structure of the magnetic field generating device J is arbitrary. For example, the magnetic field generating device J may include an iron core J2, a superconducting coil (not shown), a vacuum-insulated container J4, etc. In this case, the superconducting coil (not shown) is housed inside the vacuum-insulated container J4. Figure 1 As shown, the vacuum insulated container J4 can be configured on both sides of the specified working space J6 (and thus, the billet B) in the depth direction DD. Furthermore, a portion of the iron core J2 can be housed inside the vacuum insulated container J4.

[0056] However, the billet rotation holding device S can also be used for purposes other than heating the billet B. The billet rotation holding device S may also exclude the magnetic field generating device J.

[0057] The following provides a more detailed explanation of the motor-side retainer HM and the compressor-side retainer HP.

[0058] Figures 2 to 5 An example of a motor-side retainer HM is shown. Figure 2 This is a perspective view schematically showing an example of the motor-side retainer HM. Figure 3 The diagram schematically illustrates the state (natural state) under which no force from the blank B is applied to the retaining surface HS of the motor-side retainer HM, through a cross-section along the central axis HMO of the motor-side retainer HM. Figure 2 A cross-sectional view of the motor-side retainer HM along the axial direction. Figure 4 This is used to describe when a force from the blank B is applied to the retaining surface HS of the motor-side retainer HM. Figure 2 A diagram illustrating the operation of the motor-side retainer HM. Figure 5 It is through a direction perpendicular to the axis. Figure 3 The cross section of line AA is schematically shown. Figure 3 A cross-sectional view of the motor-side retainer HM in the direction perpendicular to the axis. Figures 6 to 8 An example of a compressor-side retainer HP is shown. Figure 6 This is a perspective view schematically showing an example of the compressor-side retainer HP. Figure 7 The diagram schematically illustrates the state (natural state) under which no force from the billet B is applied to the holding surface HS of the press-side retainer HP, through a cross-section along the central axis HPO of the press-side retainer HP. Figure 6 A cross-sectional view of the HP retainer on the side of the press in the axial direction. Figure 8 It is through a direction perpendicular to the axis. Figure 7 The cross-section of line BB is schematically shown. Figure 7 A cross-sectional view of the HP side retainer in the direction perpendicular to the axis of the press.

[0059] like Figures 2 to 8 As shown, retaining members HM and HP respectively include a fixed part HO, a movable part HY, and a main body elastic part HE.

[0060] The fixing part HO of the motor-side retainer HM is configured to be fixed to the motor shaft MS. Figure 3 Therefore, the fixing part HO of the motor-side retaining member HM is configured to be integrally linked with the motor shaft MS. When the fixing part HO of the motor-side retaining member HM is fixed to the motor shaft MS, it is coaxial with the motor shaft MS.

[0061] The retaining part HO of the compressor side retainer HP is configured to be fixed to the compressor shaft PS ( Figure 7 Therefore, the fixing part HO of the press-side retainer HP is configured to be integrally linked with the press shaft PS. When the press-side retainer HP is fixed to the press shaft PS, the fixing part HO is coaxial with the press shaft PS.

[0062] The fixing of the fixed part HO to the motor shaft MS or the press shaft PS can be implemented by any method or means such as snapping, fastening, or welding.

[0063] In each retaining member HM and HP, the fixing part HO can be constructed by connecting multiple independent parts together through fastening or the like, or it can be constructed by a single part. The fixing part HO is preferably made of metal. The fixing part HO can be made of a single material or a combination of materials.

[0064] In each retainer HM, HP, the fixing part HO has an internal space HOh that is open at least on the blank side ADB in the axial direction. Figure 3 , Figure 7 The internal space HOh of the fixing part HO can also be further opened on the opposite side ADA of the blank in the axial direction, thereby being configured as a through hole through the fixing part HO in the axial direction AD, or it can be configured as a recess obtained by closing the opposite side ADA of the blank in the axial direction and only opening the blank side ADB in the axial direction.

[0065] In each retaining member HM and HP, the moving part HY is configured to be able to move (move) along the axial direction AD within the internal space HOh of the fixed part HO. Figure 3 , Figure 7 The moving part HY is configured such that no force from the blank B, etc., is applied to the holding surface HS of the retainers HM and HP (natural state). Figure 3 Below, it is roughly coaxial with the fixed part HO.

[0066] More specifically, in this embodiment, such as Figure 3 , Figure 7As illustrated, the outer peripheral surface of the moving part HY has a plurality of engaging parts HYE arranged radially in a convex shape (i.e., formed by a shape protruding outwards). Each engaging part HYE has a surface HYsc facing the blank side ADB in the axial direction, a surface HYsb facing the blank side ADA in the axial direction and positioned closer to the blank side ADA than the surface HYsc, and a surface HYsd facing outwards and connecting the outer peripheral ends of the surfaces HYsc and HYsb to each other. Furthermore, the inner peripheral surface of the fixing part HO, which divides the internal space HOh, has a plurality of engaging parts HOE arranged radially in a concave shape (i.e., formed by a shape recessed outwards). Each engaging part HOE has: a surface HOsc facing the blank side ADA in the axial direction, a surface HOsb facing the blank side ADB in the axial direction and positioned closer to the blank side ADA than the surface HOsc, and a surface HOsd facing inwards and connecting the outer peripheral ends of the surfaces HOsc and HOsb to each other. The engaging part HYE of the moving part HY and the engaging part HOE of the fixed part HO engage with each other. Figure 3 , Figure 7 The length of the concave portion (HOE in this example) of the engaging portion HYE and the engaged portion HOE is greater than the length of the convex portion (HYE in this example) of the engaging portion HYE. That is, the distance between the surfaces HOsc and HOsb of the engaged portion HOE along the axial direction AD is greater than the distance between the surfaces HYsc and HYsb of the engaging portion HYE along the axial direction AD. Therefore, a gap exists between the engaging portion HYE and the engaged portion HOE along the axial direction AD, and thus, the convex portion (HYE in this example) of the engaging portion HYE can move along the axial direction AD inside the concave portion (HOE in this example). In this example, the engaging part HYE is able to move between the surfaces HOsc and HOsb of the engaged part HOE along the axial direction AD. That is, the moving part HY, relative to the fixed part HO, is able to move only the length difference between the engaging part HYE and the engaged part HOE in the axial direction AD.

[0067] However, the structure is not limited to this example. For example, the engaging part HYE of the moving part HY may be concave in the radial direction (i.e., it may be formed by a shape that is recessed to the inner circumference), and the engaging part HOE of the fixing part HO may be convex in the radial direction (i.e., it may be formed by a shape that protrudes to the inner circumference).

[0068] Furthermore, in this specification, when describing the engaging part HYE or the engaged part HOE, unless otherwise specified, it refers to describing each engaging part HYE or each engaged part HOE.

[0069] In this embodiment, in each retaining member HM and HP, the moving part HY is configured to transmit rotational torque with the fixed part HO. Figure 5 , Figure 8 Therefore, the moving part HY can move relative to the fixed part HO along the axial direction AD, and rotate in conjunction with the fixed part HO.

[0070] More specifically, in this embodiment, such as Figure 5 , Figure 8 As shown, the outer peripheral surface of the sliding part HY has the aforementioned multiple engaging portions HYE, which are arranged at intervals along the circumferential direction. Furthermore, the inner peripheral surface of the fixed part HO, which divides the internal space HOh, has the aforementioned multiple engaged portions HOE, which are arranged at intervals along the circumferential direction and engage with the multiple engaging portions HYE of the sliding part HY. Thus, by engaging the multiple engaging portions HYE with the multiple engaged portions HOE, rotational torque can be transmitted between the fixed part HO and the sliding part HY.

[0071] Thus, in this embodiment, the engagement relationship between the engaging part HYE of the moving part HY and the engaging part HOE of the fixed part HO is such that the moving part HY can move relative to the fixed part HO along the axial direction AD, and rotational torque can be transmitted between the fixed part HO and the moving part HY.

[0072] Furthermore, in each retainer HM and HP, the moving part HY has a retaining surface HS on the blank side ADB in the axial direction of the moving part HY. This retaining surface HS is configured to retain the end face Bf of the blank B. Figure 3 , Figure 7 The retaining surface HS is formed by at least a portion of the end face of the blank side ADB in the axial direction of the moving part HY. The retaining surface HS of the motor side retainer HM is configured to retain the end face Bf of the first side AD1 in the axial direction of the blank B. Figure 1 The retaining surface HS of the press-side retainer HP is configured to retain the end face Bf of the second side AD2 in the axial direction of the blank B. Figure 1 ).

[0073] In each retaining member HM and HP, the moving part HY can be constructed by connecting multiple independent components together through fastening or the like, or it can be constructed from a single component. The moving part HY is preferably made of metal. The moving part HY can be made of a single material or multiple materials. For example, in addition to metal, the moving part HY can also contain heat-insulating materials.

[0074] In this embodiment, in each retaining member HM and HP, the floating part HY is configured such that a portion of the floating part HY extends closer to the end face of the blank-side ADB in the axial direction than the end face of the fixed part HO in the axial direction, and the retaining surface HS is positioned closer to the end face of the blank-side ADB in the axial direction than the end face of the fixed part HO in the axial direction. Figure 3 , Figure 7 ).

[0075] In each retaining member HM, HP, the main elastic part HE is disposed within the internal space HOh of the fixed part HO between the fixed part HO and the moving part HY. Figure 3 , Figure 7 Therefore, the main elastic part HE is configured to apply elastic force between the fixed part HO and the moving part HY. The main elastic part HE is configured approximately coaxially with the fixed part HO (and consequently approximately coaxially with the moving part HY). The main elastic part HE is composed of one or more disc springs HD. The one or more disc springs HD constituting the main elastic part HE are configured approximately coaxially with the fixed part HO (and consequently approximately coaxially with the moving part HY).

[0076] The main elastic part HE preferably has multiple disc springs HD. In this case, the multiple disc springs HD constituting the main elastic part HE are arranged relative to each other along the axial direction AD. As for the arrangement of the multiple disc springs HD relative to each other along the axial direction AD, it can be any arrangement such as parallel connection only, series connection only, or a combination of parallel connection and series connection.

[0077] In this embodiment, the retainer HM (on the motor side) Figure 3 In the structure, the main elastic part HE is disposed in the space between surface HYsa and surface HOsa within the internal space HOh of the fixed part HO. Surface HYsa is located on the outer peripheral surface of the moving part HY, facing the opposite side of the blank in the axial direction ADA. Surface HOsa is located on the inner peripheral surface of the fixed part HO, dividing the internal space HOh, facing the blank side ADB in the axial direction and positioned closer to the opposite side of the blank in the axial direction ADA than surface HYsa. The main elastic part HE is in the natural state of the retainer HM ( Figure 3 Under these conditions, it comes into contact with these surfaces HYsa and HOsa, thereby elastically connecting these surfaces HYsa and HOsa to each other (and thus elastically connecting the moving part HY and the fixed part HO to each other).

[0078] In the retaining member HM, the main elastic part HE is in the natural state of the retaining member HM ( Figure 3 Under these conditions, the material can be compressed in the axial direction AD, and the floating part HY can be forced by the main elastic part HE towards the blank side ADB in the axial direction.

[0079] In this embodiment, the compressor-side retainer HP ( Figure 7 In this structure, the main elastic part HE is composed of two partial elastic parts HEA and HEB. Each of the partial elastic parts HEA and HEB is composed of one or more disc springs HD. An additional movable part HN is disposed between the two partial elastic parts HEA and HEB along the axial direction AD. This additional movable part HN is configured to move along the axial direction AD within the internal space HOh of the fixed part HO. The additional movable part HN is located on the opposite side of the blank in the axial direction ADA relative to the movable part HY (also referred to as the "main movable part HY"). The fixed part HO, located further on the opposite side of the blank in the axial direction ADA than the movable part HY, includes a generally cylindrical outer cylindrical part HOH having the outer peripheral surface of the fixed part HO, and an inner peripheral part HOL located further on the inner peripheral side than the outer cylindrical part HOH. The internal space HOh between the outer cylindrical part HOH and the inner peripheral part HOL is annular. The end face of the outer cylindrical part HOH extends further towards the blank side ADB in the axial direction than the end face of the inner peripheral part HOL. A portion of the elastic part HEA in the main elastic part HE is disposed in the space between surface HYsa and surface HNa within the internal space HOh of the fixed part HO. Surface HYsa is located further along the axial direction on the blank side ADB than the inner peripheral part HOL of the fixed part HO, and on the outer peripheral surface of the moving part HY, facing the opposite side ADA of the axial direction blank. Surface HNa is located in the additional moving part HN, facing the axial direction blank side ADB and located further along the axial direction blank side ADA than surface HYsa. Surface HYsa is located further along the axial direction blank side ADA than the engaging part HYE. The portion of the elastic part HEA is in the natural state of the retainer HP ( Figure 7 Under these conditions, it contacts these surfaces HYsa and HNa, and then elastically connects these surfaces HYsa and HNa to each other (and thus, the moving part HY and the additional moving part HN to each other). The other part of the elastic part HEB in the main elastic part HE is disposed in the space between surface HNc and surface HOf in the internal space HOh of the fixed part HO. The surface HNc is located on the outer peripheral side of the inner peripheral part HOL of the fixed part HO on the opposite side ADA of the blank in the axial direction of the additional moving part HN. The surface HOf is on the outer peripheral surface of the inner peripheral part HOL of the fixed part HO, facing the blank side ADB in the axial direction and located at a position further away from the blank side ADA in the axial direction than the surface HNc. The partial elastic part HEB is in the natural state of the retainer HP ( Figure 7Below, it contacts these surfaces HNc and HOf, thereby elastically connecting these surfaces HNc and HOf to each other (and further, the additional moving part HN and the fixed part HO to each other). The additional moving part HN has a surface HOe facing the blank side ADB in the axial direction between the aforementioned surfaces HNa and HNc in the axial direction AD. The surface HOe of the additional moving part HN restricts the displacement towards the blank side ADB in the axial direction via the surface HNb on the outer peripheral surface of the inner peripheral part HOL of the fixed part HO, facing the blank opposite side ADA in the axial direction. The surface HNb of the fixed part HO is located further towards the blank side ADB in the axial direction than the aforementioned surface HOf of the fixed part HO. Thus, in this embodiment, the press-side retainer HP ( Figure 7 The main elastic part HE is configured to apply elastic force between the moving part HY and the fixed part HO via the additional moving part HN, thereby elastically connecting the moving part HY and the fixed part HO to each other.

[0080] In the retainer HP, the main elastic part HE is in the natural state of the retainer HP ( Figure 7 Under these conditions, the part can be in a compressed state along the axial direction AD, and the floating part HY can apply force from the main elastic part HE to the blank side ADB along the axial direction.

[0081] but, Figure 3 , Figure 7 The holders HM and HP shown are merely examples, and their structures may differ from those in this example. For instance, both holders HM and HP may have the same structure as holder HM in this example.

[0082] Here, the blank rotation holding device S of this embodiment, configured as described above, is discussed. Figure 1 The action example is explained below.

[0083] First, the motor shaft MS of motor M and the press shaft PS of press P are pre-configured so that their respective central axes MSO and HPO are located on approximately the same straight line. At this time, the distance between the motor shaft MS and the press shaft PS is set to be greater than the length of the billet B.

[0084] Subsequently, the billet B is transported between the motor shaft MS and the press shaft PS. Any device can be used, or it can be done manually, to transport the billet B between the motor shaft MS and the press shaft PS. Furthermore, the transport direction (movement direction) of the billet B when transporting it between the motor shaft MS and the press shaft PS can be arbitrary. For example, the billet B can be positioned between the motor shaft MS and the press shaft PS by moving it in a direction toward the first longitudinal side VD1, the depth direction DD, or the second longitudinal side VD2.

[0085] With the billet B positioned between the motor shaft MS and the press shaft PS, the press shaft PS is displaced towards the first side AD1 in the axial direction, causing the respective holding surfaces HS of the motor-side holding member HM and the press-side holding member HP of the billet holding unit U to contact the corresponding end face Bf of the billet B. Subsequently, while further displacing the press shaft PS towards the first side AD1 in the axial direction, a pressure is output from the press shaft PS towards the first side AD1 in the axial direction. This increases the pressure (clamping force) acting between the holding surfaces HS of the motor-side holding member HM and the press-side holding member HS, thereby compressing the billet B. Furthermore, because this pressure (clamping force) is sufficiently large, the billet B will not detach from the holding members HM and HP, and is securely held (clamped) by the holding members HM and HP. Then, the motor shaft MS is rotated by the motor M. The rotational torque output from the motor shaft MS is sequentially transmitted to the fixed part HO of the motor-side retainer HM, the moving part HY of the motor-side retainer HM, the billet B, the moving part HY of the press-side retainer HP, the fixed part HO of the press-side retainer HP, and the press shaft PS, thereby causing them to rotate in linkage with the motor shaft MS.

[0086] During the rotation of billet B, the magnetic field generating device J generates a magnetic field in the designated working space J6 where billet B is located. During this time, billet B is heated by the induced current flowing within it.

[0087] The billet B, heated by the billet rotating holding device S, is then transported, for example, to a processing machine such as an extruder for extrusion processing or other processing.

[0088] In this embodiment, as described above, the movable part HY is configured to move along the axial direction AD within the internal space HOh of the fixed part HO. Furthermore, the main elastic part HE, composed of one or more disc springs HD, is positioned approximately coaxially with the fixed part HO within the internal space HOh of the fixed part HO, between the fixed part HO and the movable part HY. Thus, as in Figure 9 (d) to Figure 9As illustrated exaggeratedly in (f), the moving part HY (and consequently, the holding surface HS) can withstand the elastic force from the main body elastic part HE while being inclined relative to the fixed part HO with the central axis of the moving part HY inclined relative to the central axis of the fixed part HO. Therefore, assuming that the end face Bf of the billet B is not perpendicular to the central axis BO of the billet B, the holding members HM and HP are firmly and tightly engaged with the end face Bf of the billet B in the state where the holding surface HS of the moving part HY is inclined relative to the fixed part HO. Through the pressure from the press shaft PS and the elastic force from the main body elastic part HE, the two end faces Bf of the billet B can be firmly held. That is, the billet holding unit U is configured to absorb the tilt error (shape error) of the two end faces Bf of the billet B. In this way, even when the end face Bf of the billet B is tilted, the billet rotation holding device S can firmly hold both ends of the billet B while rotating the billet B, and can also reduce the error of the mechanical central axis and rotation axis of the billet B, and reduce unbalanced vibration.

[0089] Furthermore, according to the structure described above in this embodiment, even when the central axis MSO of the motor shaft MS (and, consequently, the central axis of the fixing portion HO of the motor-side retainer HM) and the central axis PSO of the press shaft PS (and, consequently, the central axis of the fixing portion HO of the press-side retainer HO) are not perfectly aligned (for example, when the two axes are parallel to each other but misaligned in the longitudinal direction VD and / or the depth direction DD), Figure 9 (d) or in the case where the two axes are not parallel to each other ( Figure 9 (e) Figure 9 (f) This alignment deviation can also be absorbed by appropriately tilting the moving part HY relative to the fixed part HO. Therefore, the blank B can be rotated while its two ends are securely held in a tightly joined state. Furthermore, the error between the mechanical center axis and the rotation axis of the blank B can be reduced, thus reducing unbalanced vibration. Furthermore, it can suppress the falling off or breakage of the blank B. Additionally, as... Figure 1 As shown in the implementation, when the billet B is heated during the rotation of the billet B, the reduction in the ability to heat the billet B can also be suppressed.

[0090] In addition, in such Figure 1 In the embodiment described above, where the billet B is heated while rotating, the length of the billet B can change during rotation. However, according to the structure described above in this embodiment, since the moving part HY (and consequently, the holding surface HS) is subjected to the elastic force from the main body elastic part HE, it can move relative to the fixed part HO in the axial direction AD. Therefore, it can stably follow such changes in the length of the billet B, and can rotate the billet B while firmly holding both ends of the billet B in a tightly joined state. Figure 9 (a) to Figure 9 (c)).

[0091] In the various examples described in this specification, such as Figure 2 As shown, the retaining surface HS of the motor-side retainer HM preferably has multiple concave strips HG and multiple convex strips HR. The concave strips HG are recessed towards the opposite side of the blank in the axial direction ADA. The convex strips HR protrude towards the blank side ADB in the axial direction. These concave strips HG and convex strips HR extend approximately radially and are arranged alternately one by one in the circumferential direction.

[0092] Therefore, as Figure 4 As illustrated, during the period when the billet B is pressed against the retaining surface HS by the pressure from the press shaft PS, the end face Bf of the billet B can be engaged with the grooves formed by the convex rib HR and concave rib HG in the retaining surface HS. Thus, unlike the case where there are no grooves on the retaining surface HS, not only through the frictional engagement between the retaining surface HS of the motor-side retainer HM and the billet B, but also through the mechanical engagement between the aforementioned grooves on the retaining surface HS of the motor-side retainer HM and the billet B, torque from the motor shaft MS side can be transmitted, thereby improving the torque transmission efficiency between the retaining surface HS of the motor-side retainer HM and the billet B.

[0093] In addition, such as Figure 4 As shown, each rib HR, in the circumferential cross-section, preferably presents a generally triangular or generally trapezoidal shape protruding toward the blank side ADB in the axial direction. In this case, the opening angle α of each rib HR ( Figure 4 For example, the angle is preferably 55° to 65°, and more preferably 60°. This further improves the torque transmission efficiency between the retaining surface HS of the motor-side retainer HM and the blank B.

[0094] Similarly, as Figure 4 As shown, each recessed strip HG, in the circumferential cross section, preferably has a generally triangular or generally trapezoidal shape with a recess facing the opposite side ADA of the blank in the axial direction.

[0095] On the retaining surface HS of the motor-side retainer HM, the protruding front edge HRT of each rib HR in the axial direction of the blank-side ADB, such as Figure 3 As shown, the ADA preferably extends towards the opposite side of the blank in the axial direction as it moves towards the radially inward side.

[0096] Therefore, during the rotation of the billet B, the end face Bf of the billet B can be facilitated to engage with the outer peripheral side (and thus, the high torque side) of each of the protrusions HR on the retaining surface HS of the motor-side retainer HM, towards the concave-convex joint formed by the protrusions HR and concave strips HG on the retaining surface HS. Furthermore, the central axis of the billet B can be brought closer to the central axis of the retaining surface HS of the motor-side retainer HM (centering). This further improves the torque transmission efficiency between the retaining surface HS of the motor-side retainer HM and the billet B, and reduces the error between the mechanical central axis and the rotation axis of the billet B, thus reducing unbalanced vibration. Furthermore, it can suppress positional displacement, detachment, and breakage of the billet B. In addition, compared to existing general fixtures, the outer perimeter can be reduced.

[0097] In the retaining surface HS of the motor-side retainer HM, the bottom edge HGB of the blank on the opposite side of ADA in the axial direction of each recess HG, such as Figure 3 As shown, it can also extend towards the blank side ADB in the axial direction, moving towards the radially inward side.

[0098] However, the retaining surface HS of the motor-side retainer HM is... Figure 6 Similarly, the retaining surface HS of the compressor side retainer HP shown may also be without the convex strip HR and concave strip HG, and the retaining surface HS may be generally flat (generally parallel to the direction perpendicular to the axis).

[0099] In addition, the machining of the grooves formed by the convex ribs HR and concave ribs HG is achieved by using various cutting tools with angled cutting tips to form straight one-dimensional grooves on a mortar-shaped surface. This is combined with the equal spacing control on the index head, resulting in high productivity and lower cost compared to two-dimensional or three-dimensional machining when forming grooves.

[0100] like Figure 6 As shown, the retaining surface HS of the compressor side retainer HP can also be in a generally flat state (generally parallel to the direction perpendicular to the axis) without the convex strip HR and concave strip HG.

[0101] like Figure 2 , Figure 6 As shown, retainers HM and HP may each include a guide protrusion HC protruding further axially toward the blank side ADB than the retainer surface HS on the outer periphery of the retainer surface HS. The guide protrusion HC preferably extends circumferentially. The guide protrusion HC can be as follows: Figure 6 As in the example, it extends continuously along the entire circumference, or it can also be like... Figure 2As in the example, it extends discontinuously in the circumferential direction. By setting the guide protrusion HC, when the blank B is positioned between the retainers HM and HP, it is easy to position the blank B on the inner circumferential side of the guide protrusion HC. Furthermore, it is easy to position the blank B such that its central axis BO lies on a straight line approximately the same as the central axes HMO and HPO of the retainers HM and HP. In addition, it is possible to prevent the blank B from falling off or becoming misaligned from the retaining surface HS.

[0102] As described above, when the retaining surface HS of the motor-side retainer HM has a concave-convex shape composed of a convex strip HR and a concave strip HG, the motor-side retainer HM preferably has an ejection portion HK. Figures 3 to 4 The ejection section HK is configured such that when the force applied from the billet B to the holding surface HS on the first side AD1 in the axial direction (specifically, the force applied from the press shaft PS via the press-side holder HP and the billet B to the holding surface HS on the motor-side holder HM on the first side AD1 in the axial direction) is below a predetermined value, it will protrude to the second side AD2 in the axial direction, which is further from the holding surface Hs (preferably the protruding front edge HRT of the rib HR). Figure 3 This pushes the billet B toward the second side AD2 in the axial direction, thereby causing the billet B to detach from the holding surface HS.

[0103] exist Figures 3 to 4 In the example motor-side retainer HM, the ejector HK is disposed within an internal space HYh located on the central axis HMO in the moving part HY. At least the blank side ADB (in the example shown, both sides of the axial direction AD) in the internal space HYh is open. The ejector HK is configured to move along the axial direction AD within the internal space HYh. The ejector HK has a protrusion HKP extending outwards along its axial direction AD. An elastic part HKE for the ejector is provided in the space between surfaces HKsa and HYse within the internal space HYh of the moving part HY. Surface HKsa is located on the blank-opposite side ADA of the protrusion HKP in the axial direction of the ejector HK. Surface HYse is located on the inner circumferential surface of the moving part HY that divides the internal space HYh, facing the blank-opposite side ADB in the axial direction, and is positioned further away from the blank-opposite side ADA in the axial direction than surface HKsa. The elastic part HKE for the ejector is composed of one or more disc springs HKD arranged substantially coaxially with the moving part HY. The surface HKsb of the protrusion HKP of the ejection part HK in the axial direction of the blank side ADB, through the action of the surface HYsf in the inner peripheral surface of the moving part HY that divides the internal space HYh, facing the blank opposite side ADA in the axial direction and located closer to the blank side ADB in the axial direction than the surface HYse, restricts further movement toward the blank side ADB in the axial direction.

[0104] During the period when the force applied from the blank B to the first side AD1 in the axial direction of the holding surface HS exceeds the specified value ( Figure 4 The force exerted by the elastic part HKE on the ejector section HK overcomes the force of the ejector section HK on the blank side ADB in the axial direction. The front end face HKT of the ejector section HK on the blank side ADB is pushed by the end face Bf of the blank B towards the first side AD1 in the axial direction to a position approximately the same as the holding face HS in the axial direction AD. On the other hand, when the force applied from the blank B towards the holding face HS toward the first side AD1 in the axial direction is less than a predetermined value (e.g., the force exerted by the elastic part HKE on the ejector section HK) Figure 3 The ejection section HK is configured such that, by the force of the elastic section HKE, the front end face HKT of the blank side ADB in the axial direction of the ejection section HK protrudes further from the second side AD2 in the axial direction than the holding surface Hs (preferably the protruding front edge HRT of the convex strip HR). Figure 3 This causes the billet B to be pushed out toward the second side AD2 in the axial direction, thereby causing the billet B to detach from the holding surface HS.

[0105] By setting the ejection part HK, the billet holding unit U temporarily holds the billet B, and then the end face Bf of the billet B bites into the groove formed by the convex strip HR and the concave strip HG on the holding surface HS of the motor-side holding member HM. Figure 4 Through the ejection section HK, the billet B can be easily disengaged from the grooves formed by the raised strip HR and the recessed strip HG on the holding surface HS.

[0106] Furthermore, as shown in this example, when the motor-side retainer HM has a guide protrusion HC, the ejector HK is preferably configured such that the front end face HKT of the blank side ADB in the axial direction of the ejector HK can be displaced further in the axial direction of the second side AD2 than the protruding front end edge HCT of the guide protrusion HC in the axial direction of the second side AD2. Figure 3 ).

[0107] The retainers HM and HP can each be as follows: Figure 10 As shown in the modified example, the engaging portion HYE of the moving part HY and the engaged portion HOE of the fixed part HO are configured as a gear coupling. That is, for example, the surface HYsd facing the outer periphery in the engaging portion HYE can also be formed with a cross-section in the axial direction ( Figure 10 In the ), it is a curved surface that bends convexly toward the outer periphery. As a result, the moving part HY is prone to tilting relative to the fixed part HO.

[0108] Industrial availability

[0109] The billet rotation holding device and billet holding unit according to the present invention can be used for any purpose, such as a billet heating device for heating billets (e.g., aluminum billets).

[0110] Symbol Explanation

[0111] S: Billet rotation holding device; M: Electric motor; MS: Motor shaft; MSO: Center axis of the motor shaft; P: Pressurizer; PS: Press shaft; PSO: Center axis of the compressor shaft; J: Magnetic field generating device; J2: Iron core; J4: Vacuum insulated container; J6: Defines the workspace; TA, TB, TC: Support platform; U: Blank holding unit; HM: Motor-side retainer (retainer); HMO: Center axis of the motor-side retainer; HP: Compressor side retainer (retainer); HPO: Center axis of the compressor-side retainer; HO: Fixed part; HOh: Internal space; HOsa, HOsb, HOsc, HOsd, HOf: surface; HOE: The part that is stuck together; HOH: outer cylinder part; HOL: Inner periphery; HY: Swimming part (main swimming part); HYsa, HYsb, HYsc, HYsd, HYse, HYsf: surface; HYE: Card-locking part; HS: Retaining surface; HG: Recessed stripe; HGB: Bottom edge of the recessed strip; HR: convex stripe; HRT: The protruding front edge of the convex strip; HC: Guiding protrusion; HCT: The prominent anterior edge of the guide protrusion; HYh: Internal space; HE: Main elastic part; HEA, HEB: Partial elastic components; HD: Disc spring; HK: Launch Department; HKT: Front-end face; HKP: Prominent part; HKsa, HKsb: Stepped surface; HKE: Elastic part used in the ejection section; HKD: Disc spring; HN: Additional moving part; HNa, HNb, HNc: Surface; B: Raw material; Bf: End face in the axial direction; BO: The center axis of the billet; AD: Axis direction; AD1: First side in the axial direction; AD2: The second side along the axis; ADB: Axial direction, blank side; ADA: Opposite side of the billet in the axial direction; VD: Vertical; VD1: First side in the longitudinal direction; VD2: Second side in the longitudinal direction; DD: Depth direction.

Claims

1. A billet rotation holding device, configured to hold a billet while rotating it, comprising: An electric motor, having a motor shaft; A press having a press shaft disposed opposite to the motor shaft in the axial direction; as well as billet holding unit The blank holding unit includes: A motor-side retainer, mounted on the motor shaft, configured to retain the end face of the blank on a first side in the axial direction; and A press-side retainer, mounted on the press shaft, is configured to retain the end face of the billet on the second side in the axial direction. The press is configured to output pressure toward a first side in the axial direction via the press shaft. The billet holding unit is configured to clamp the end faces of the billet on both sides of the axial direction using the pressure output from the press shaft toward the first side of the axial direction, via the motor-side holding member and the press-side holding member. The motor-side retainer and the compressor-side retainer each include: The fixing part is configured to be fixed to the motor shaft or the press shaft and has an internal space that is open at least on the blank side in the axial direction; A movable portion, configured to move along the axial direction within the internal space of the fixed portion, and configured to transmit rotational torque with the fixed portion, has a retaining surface on the blank side in the axial direction, the retaining surface being configured to retain an end face of the blank on a first side or a second side in the axial direction; and The main elastic part is composed of one or more disc springs, which are arranged approximately coaxially with the fixed part within the internal space of the fixed part between the fixed part and the moving part.

2. The billet rotation holding device according to claim 1, wherein, The motor-side retainer and the compressor-side retainer are respectively configured as follows: The outer peripheral surface of the movable part has multiple engaging portions, which are respectively arranged in a convex or concave shape in the radial direction and are arranged circumferentially. The inner circumferential surface that divides the internal space in the fixing part has a plurality of engaging portions, which are respectively arranged in a concave or convex shape in the radial direction, arranged circumferentially, and engaging with the plurality of engaging portions. By engaging the plurality of engaging parts with the plurality of engaged parts, rotational torque can be transmitted between the fixed part and the movable part.

3. The billet rotation holding device according to claim 1, wherein, The retaining surface of the motor-side retainer has concave and convex ribs that extend approximately radially and are alternately arranged circumferentially.

4. The billet rotation holding device according to claim 3, wherein, The protruding front edge of each of the convex strips on the blank side in the axial direction extends toward the opposite side of the blank in the axial direction as it moves toward the radially inward side.

5. The billet rotation holding device according to claim 3, wherein, The motor-side retainer has a push-out portion configured such that when the force applied from the blank to the retaining surface toward the first side in the axial direction is below a predetermined value, the push-out portion protrudes toward a second side in the axial direction that is closer to the retaining surface, pushing the blank toward the second side in the axial direction.

6. The billet rotation holding device according to claim 1, wherein, Also includes: A magnetic field generating device is configured to generate a magnetic field in a specified workspace. The billet rotation holding device is configured to rotate the billet while holding it within the specified working space, and to generate a magnetic field in the specified working space using the magnetic field generator, during which the billet is heated by an induced current flowing within it.

7. A billet holding unit of the aforementioned, wherein, The billet rotation holding device is configured for use in any one of claims 1 to 6.

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