Clamping device

Abstract

The utility model provides a clamping device. The clamping device comprises: a chuck (3) having a receiving portion (35) extending about an axis (x); a plurality of claw parts (2) which are detachably mounted in the housing part (35) and which clamp the workpiece (10) in the radial direction orthogonal to the axis (x); and a holding section (4) that holds the chuck (3) from the outer peripheral side in the radial direction. The chuck (3) is fastened from the outer peripheral side by the holding section (4), and the workpiece (10) is clamped between the plurality of claw sections (2) in the radial direction.

Description

Technical Field

[0001] This utility model relates to a clamping device. Background Technology

[0002] For example, during the finishing stage of manufacturing, the metal annular reinforcing ring that constitutes the oil seal undergoes cutting processing, such as for dimensional adjustment. During the cutting process, the reinforcing ring is mounted on the chuck of the clamping device. By tightening the chuck from the outer peripheral side, the workpiece, i.e., the reinforcing ring, is clamped within the chuck. Utility Model Content

[0003] The problem to be solved by utility models

[0004] The machining position of the reinforcing ring along the axis is adjusted by the amount of rotation of the chuck relative to the main body of the clamping device around the axis. When machining multiple reinforcing rings with different diameters, the chuck is changed according to the diameter, but the machining position needs to be adjusted according to the chuck. This reduces the operating efficiency of the clamping device.

[0005] This invention was made in view of the above-mentioned problems, and its purpose is to provide a clamping device that does not require replacement of the chuck.

[0006] Methods for solving problems

[0007] To achieve the above objectives, the clamping device of this utility model includes: a chuck having a receiving portion extending about an axis; a plurality of jaws detachably mounted in the receiving portion for clamping a workpiece in a radial direction orthogonal to the axis; and a retaining portion holding the chuck from the outer peripheral side in the radial direction, the retaining portion securing the chuck from the outer peripheral side, thereby clamping the workpiece between the plurality of jaws in the radial direction.

[0008] The storage space for storing the workpiece is defined by the multiple claws.

[0009] The three claws are arranged circumferentially.

[0010] All of the claws have the same structure.

[0011] Utility Model Effect

[0012] According to this utility model, a clamping device that does not require chuck replacement can be provided. Attached Figure Description

[0013] Figure 1 This is a partially enlarged cross-sectional view that schematically shows the structure of the clamping device 1 according to one embodiment of the present invention.

[0014] Figure 2 It is a three-dimensional diagram that roughly represents the structure of a specific example of a chuck 3.

[0015] Figure 3 This is a front view that schematically shows the structure of the clamping device 1 according to one embodiment of the present invention.

[0016] Figure 4 It is a perspective view that roughly shows the structure of the claw 2 in a specific example.

[0017] Figure 5 This is a top view that roughly shows the structure of the claw 2 in a specific example.

[0018] Figure 6 This is a bottom view that roughly shows the structure of the claw 2 in a specific example.

[0019] Figure 7 It is along Figure 5 and Figure 6 The cross-sectional view of line 7-7.

[0020] Figure 8 and Figure 1 Correspondingly, this is a cross-sectional view illustrating the usage of the clamping device 1 according to one embodiment of the present invention.

[0021] Figure 9 and Figure 2 The corresponding diagram is a perspective view illustrating the usage of a specific example of the chuck 3. Detailed Implementation

[0022] The embodiments of this utility model will now be described with reference to the accompanying drawings. Figure 1 This is a partially enlarged cross-sectional view that schematically shows the structure of the clamping device 1 according to one embodiment of the present invention. Figure 1 This is a cross-sectional view including axis x. The clamping device 1 is capable of holding the workpiece, which is the object to be machined, while rotating the workpiece about axis x. The clamping device 1 is associated with the cutting head (not shown) of the cutting device. As described later, the workpiece, positioned in a predetermined machining position, rotates about axis x along the direction of axis x (hereinafter referred to as the "axial direction") via the clamping device 1, and the cutting head performs cutting machining on the workpiece.

[0023] The clamping device 1 includes: multiple jaws 2, a chuck 3, a retaining part 4, a coupling 5, a cylinder 6, and a mounting part 7. The multiple jaws 2 are detachably mounted to the front end of the chuck 3. Furthermore, axially, one side is designated as the front side, and the other side as the rear side. In this example, the side where the chuck 3 is located is the front side, and the side where the cylinder 6 is located is the rear side. The chuck 3 is mounted on the mounting part 7. The retaining part 4 holds the chuck 3. The retaining part 4 is mounted on the cylinder 6 by means of the coupling 5. The retaining part 4, the coupling 5, and the cylinder 6 are fixed in predetermined positions axially.

[0024] Cylinder 6 has a cylindrical cylinder body 61 centered on axis x. A cylindrical internal space 62 centered on axis x is formed within the cylinder body 61. A mounting portion 7 is disposed within the internal space 62. The mounting portion 7 has a cylindrical mounting body 71 centered on axis x. An internal thread 72 is cut on the inner circumferential surface 71a of the mounting body 71, adjacent to its front end. The mounting portion 7 is configured to be axially movable within the internal space 62 of the cylinder body 61.

[0025] Figure 2 This is a perspective view that roughly represents the construction of a specific example of chuck 3. Figure 2 In the chuck 3, multiple claws 2 are installed. See also... Figure 1 and Figure 2 The chuck 3 has a front end portion 31, a tapered portion 32, and a body portion 33. The front end portion 31, the tapered portion 32, and the body portion 33 are integrally formed, for example, from a metallic material. The front end portion 31 is disposed at the front end of the chuck 3. The front end portion 31 is defined by a cylindrical outer peripheral surface 31a having a constant diameter in a radial direction orthogonal to the axis x.

[0026] The tapered portion 32 extends rearward from the rear end of the front end portion 31. The tapered portion 32 has a radially defined outer peripheral surface 32a that tapers in diameter from the front end to the rear end. The outer peripheral surface 32a is a frustum-shaped cone centered on the axis x. The front end of the outer peripheral surface 32a connects to the rear end of the outer peripheral surface 31a of the front end portion 31. That is, the maximum diameter of the outer peripheral surface 32 defined radially is determined by the front end of the outer peripheral surface 32a. On the other hand, the minimum diameter of the outer peripheral surface 32a defined radially is determined by the rear end of the outer peripheral surface 32a.

[0027] The torso 33 extends rearward from the rear end of the tapered portion 32. The torso 33 has a cylindrical outer peripheral surface 33a with a constant radial diameter. The diameter of the outer peripheral surface 33a of the torso 33 is set to be smaller than the diameter of the outer peripheral surface 32a of the tapered portion 32. The torso 33 enters the internal space 62 of the cylinder 6. An external thread 34 is cut into the outer peripheral surface 33a of the torso 33 at a position adjacent to the rear end of the torso 33. The external thread 34 of the torso 33 engages with the internal thread 72 of the mounting body 71. The chuck 3 and the mounting portion 7 are capable of axially advancing and retracting relative to the cylinder 6.

[0028] like Figure 1As shown, the retaining part 4 has a cylindrical retaining body 41 centered on the axis x and a rear end portion 42 extending radially annularly from the rear end of the retaining body 41. The retaining body 41 is defined as having a tapered inner circumferential surface 41a that tapers in diameter from the front end toward the rear end. The inner circumferential surface 41a is a frustum-shaped cone centered on the axis x. The slope of the tapered inner circumferential surface 41a is set to be the same as the slope of the tapered outer circumferential surface 32a of the tapered part 32. In this example, the outer circumferential surface 32a has a longer length than the inner circumferential surface 41a in the axial direction.

[0029] The retaining part 4 holds the tapered portion 32 of the chuck 3 using the inner peripheral surface 41a of the retaining body 41. Specifically, in this example, the outer peripheral surface 32a of the tapered portion 32 is received by a portion of the inner peripheral surface 41a of the retaining body 41. Thus, the retaining body 41 surrounds the tapered portion 32 from the outer peripheral side. In this example, the rear end portion 42 extends along a virtual plane orthogonal to the axis x. The rear end portion 42 faces the rear end face of the tapered portion 32. That is, a predetermined gap is ensured between the tapered portion 32 and the rear end portion 42 in the axial direction.

[0030] A coupling 5 is disposed between the chuck 3 and the cylinder 6. The coupling 5 is formed in a ring shape around the axis x. The chuck 3 is connected to the coupling 5, for example, by bolts (not shown). Similarly, the coupling 5 is connected to the cylinder 6, for example, by bolts (not shown). In this way, the coupling 5 connects the chuck 3 and the cylinder 6. The body 33 of the chuck 3 enters the internal space 62 of the cylinder 6 through the rear end 42 of the retaining part 4 and inside the coupling 5.

[0031] Figure 3 This is a front view schematically showing the structure of the clamping device 1 according to one embodiment of the present invention. Furthermore, Figure 1 It is along Figure 3 The cross-sectional view along line 1-1. See also... Figures 1-3 A receiving portion 35 extending around the axis x is formed at the front end of the chuck 3. In this example, the receiving portion 35 is a cylindrical recess centered on the axis x, extending from the front end of the chuck 3 toward the rear end. The receiving portion 35 is defined with a cylindrical inner circumferential surface 35a centered on the axis x and a circular bottom surface 35b defined along a virtual plane orthogonal to the axis x. The bottom surface 35b is orthogonal to the inner circumferential surface 35a.

[0032] The chuck 3 has a through hole 36 extending from the bottom surface 35b of the receiving portion 35 to the rear end of the body 33 along the axis x. That is, the through hole 36 axially extends through the front end portion 31, the tapered portion 32, and the body 33 of the chuck 3. In this example, the through hole 36 is a cylindrical space centered on the axis x. A cylindrical inner circumferential surface 36a is defined within the through hole 36.

[0033] like Figure 2 as well as Figure 3As shown, the chuck 3 has a plurality of slits 37 extending from the front end 31 through the tapered portion 32 to the middle of the body 33. In this example, three slits 37 are formed in the chuck 3. The three slits 37 are arranged at equal intervals in the circumferential direction around the axis x. Each slit 37 is defined to be parallel to the axis x. Each slit 37 penetrates the front end 31, the tapered portion 32, and the body 33 in the radial direction. That is, each slit 37 extends from the outer peripheral surfaces 31a, 32a, and 33a of the front end 31, the tapered portion 32, and the body 33 to the inner peripheral surface 36a of the through hole 36.

[0034] Through these three slits 37, the chuck 3 separates the body 33, excluding the rear end, into three parts in the circumferential direction: a first part 3A, a second part 3B, and a third part 3C. Due to the presence of these slits 37, as described later, the first part 3A, the second part 3B, and the third part 3C of the chuck 3 can be radially secured by engaging the outer circumferential surface 32a of the tapered portion 32 with the inner circumferential surface 41a of the retaining body 41 of the retaining portion 4.

[0035] Refer to together Figures 1-3 Three claws 2 are detachably mounted on the storage section 35 of the chuck 3. The three claws 2 are arranged at predetermined intervals in the circumferential direction. In this example, the three claws 2 are arranged at equal intervals in the circumferential direction. Specifically, as... Figure 3 As shown, each claw 2 is respectively mounted on the first part 3A, the second part 3B, and the third part 3C of the chuck 3. That is, a slit 37 is provided between two adjacent claws 2, 2 in the circumferential direction.

[0036] Figure 4 It is a perspective view that roughly shows the structure of the claw 2 in a specific example. Figure 5 This is a top view that roughly shows the structure of the claw part 2 in a specific example. Figure 6 This is a bottom view that roughly shows the structure of the claw 2 in a specific example. Figure 7 It is along Figure 5 and Figure 6 The cross-sectional view of line 7-7. Furthermore, in Figure 4 For ease of explanation, three claws 2 arranged around axis x are shown. On the other hand, in... Figures 5-7 In the image, only one claw part 2 is shown.

[0037] Refer to together Figures 4-7 All three claw portions 2 have the same structure. Each claw portion 2 has a base 21 and a sidewall 22 erected from the base 21. The base 21 is located at... Figure 5 and Figure 6The overall shape is fan-shaped when viewed from above or below. The base 21 defines an upper surface 23 and a lower surface 24 along a virtual plane orthogonal to the axis x. The upper surface 23 and the lower surface 24 face away from each other. The sidewall 22 rises upward from the upper surface 23 along the outer periphery of the upper surface 23.

[0038] The sidewall 22 is defined by an inner circumferential surface 25 and an outer circumferential surface 26 about the axis x. The inner circumferential surface 25 is orthogonal to the upper surface 23. In this example, the inner circumferential surface 25 and the outer circumferential surface 26 are formed by a portion of a cylindrical surface centered on the axis x. The outer circumferential surface 26 also serves as the outer circumferential surface of the base 21. One or more recesses 27 are formed in the sidewall 22, recessed from the inner circumferential surface 25 toward the outer circumferential side. A through hole 28 is formed in the recess 27, penetrating the base 21 parallel to the axis x. On the other hand, a groove 29 is formed on the lower surface 24, extending from the edge of the outer circumferential side of the base 21 toward the inner circumferential side. The groove 29 does not extend to the edge of the inner circumferential side of the base 21.

[0039] like Figure 4 As shown, in this example, three claws 2 are arranged at equal intervals in the circumferential direction, thereby forming a storage space S for accommodating a workpiece (not shown) by the upper surface 23 of the base 21 of each claw 2 and the inner circumferential surface 25 of the sidewall 22. In this example, the storage space S is a flat cylindrical space centered on the axis x.

[0040] return Figures 1-3 Each claw portion 2 is fixed to the chuck 3 within the receiving portion 35 via a through hole 28 in the base 21 and by fastening components such as bolts. In each claw portion 2, the outer peripheral surface 26 of the sidewall 22 is supported by the inner peripheral surface 35a of the receiving portion 35. Conversely, the lower surface 24 of the base 21 is supported by the bottom surface 35b of the receiving portion 35. In this example, axially, the front end of each claw portion 2 coincides with the front end 31 of the chuck 3. That is, each claw portion 2 is completely retracted within the receiving portion 35.

[0041] like Figure 1 As shown, a fixing component 9, such as a bolt, is installed at a predetermined position on the bottom surface 35b of the receiving portion 35 of the chuck 3. The positions of the fixing components 9 in the circumferential and radial directions correspond to the positions of the grooves 29 formed on the lower surface 24 of the base 21 of each claw portion 2 mounted on the chuck 3. In this way, the head of the fixing component 9 is disposed within the groove 29. By positioning the fixing component 9 within the groove 29 in this way, the position of each claw portion 2 in the circumferential direction can be easily determined.

[0042] Figure 8 and Figure 1 Correspondingly, this is a cross-sectional view illustrating the usage of the clamping device 1 according to one embodiment of the present invention. Figure 9 and Figure 2The corresponding diagram is a perspective view illustrating the usage of chuck 3 in a specific example. See also... Figure 8 and Figure 9 When using the clamping device 1, the rear end of the body 33 of the chuck 3 is connected to the front end of the mounting part 7 by means of a threaded connection. The chuck 3 is positioned axially in a predetermined position. At this time, no radial tightening force is applied from the retaining body 41 of the retaining part 4 to the tapered part 32 of the chuck 3.

[0043] In this state, the workpiece 10 is mounted on the clamping device 1. Specifically, the workpiece 10 is mounted within the storage space S formed by the three jaws 2 of the storage portion 35 housed in the chuck 3. In this example, the workpiece 10 is an annular reinforcing ring that serves as a component of an oil seal. The elastomer portion is integrated with the reinforcing ring using a rubber material. In this example, the workpiece 10 has an annular flat plate portion 11 extending along a virtual plane orthogonal to the axis x, and a cylindrical portion 12 that rises cylindrically from the outer peripheral edge of the flat plate portion 11. The flat plate portion 11 and the cylindrical portion 12 are formed, for example, of a metallic material.

[0044] The flat plate portion 11 of the workpiece 10 is received by the upper surface 23 of the base portion 21 of each jaw portion 2. The cylindrical portion 12 of the workpiece 10 is received by the inner circumferential surface 25 of the side wall 22 of each jaw portion 2. The axially forward front end of the cylindrical portion 12 of the workpiece 10 is positioned slightly forward of the front end of the jaw portion 2 and the front end portion 31 of the chuck 3. That is, the front end of the cylindrical portion 12 of the workpiece 10 protrudes forward axially than the front end of the jaw portion 2 and the front end portion 31 of the chuck 3. In this way, the workpiece 10 is temporarily fixed to the front end of the chuck 3.

[0045] In this state, such as Figure 8 As indicated by arrow A, the chuck 3 moves axially rearward via the mounting portion 7. The retaining portion 4, the coupling 5, and the cylinder 6 are fixed axially, thus engaging the outer peripheral surface 32a of the tapered portion 32 of the chuck 3 with the inner peripheral surface 41a of the retaining body 41 of the retaining portion 4. The outer peripheral surfaces 32a and 41a decrease in diameter axially towards the rearward side, thus the retaining body 41 exerts a tightening force F from the outer peripheral side on the first portion 3A, the second portion 3B, and the third portion 3C of the chuck 3.

[0046] The first part 3A, the second part 3B, and the third part 3C of the chuck 3, which are separated from each other by the slit 37, displace each of the jaws 2 inwards. As a result, the inner circumferential surface 25 of the sidewall 22 of each jaw 2 presses against the cylindrical portion 12 of the workpiece 10 from the outer circumferential side. In this way, the workpiece 10 is clamped radially by the sidewall 22 of the three jaws 2 arranged circumferentially. In this state, the workpiece 10 is subjected to a finishing process based on cutting by a cutting head (not shown).

[0047] In the clamping device 1 described above, the three jaws housed in the receiving portion 35 of the chuck 3 can clamp the workpiece 10 using the clamping force F generated by the axial relative movement between the chuck 3 and the retaining portion 4. The jaw 2 is detachably mounted within the receiving portion 35. Therefore, for example, the jaw 2 can be replaced with one having dimensions corresponding to the axial and radial dimensions of the workpiece 10. There is no need to replace the chuck 3. That is, the chuck 3 is always mounted on the mounting portion 7, so the machining position of the workpiece 10 in the axial direction is always the same. As a result, the position control of the cutting head can be easily performed.

[0048] The present invention has been described above through the above embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications or improvements can be made to the above embodiments. As can be seen from the description in this application, such modifications or improvements are also included within the technical scope of the present invention.

[0049] The embodiments described above are for ease of understanding of this utility model and are not intended to limit the interpretation of this utility model. Furthermore, the above embodiments do not limit the scope of application of this utility model; this utility model can encompass all possible applications. The constituent elements, their arrangement, materials, conditions, shapes, and dimensions, etc., of the above embodiments are not limited to the examples shown and can be appropriately modified. For example, this utility model includes variations arising from manufacturing tolerances, etc. Furthermore, within the scope of technical non-contradiction, the constituent elements shown in different embodiments can be partially substituted or combined with each other. Additionally, the structures can be appropriately and selectively combined to achieve at least a portion of the aforementioned problems and effects.

[0050] Explanation of reference numerals in the attached figures:

[0051] 1. Clamping device

[0052] 10 workpieces

[0053] 11 Flat Plate Section

[0054] 12. Cylindrical section

[0055] 2 claws

[0056] 21 Base

[0057] 22 Sidewalls

[0058] 23. Upper surface

[0059] 24 Lower surface

[0060] 25 Inner circumferential surface

[0061] 26 Outer Peripheral Surface

[0062] 27 recess

[0063] 28 Through holes

[0064] 29. Groove

[0065] 3. Chuck

[0066] 3A Part 1

[0067] 3B Part Two

[0068] 3C Part 3

[0069] 31 Front end

[0070] 31a Outer peripheral surface

[0071] 32. Conical section

[0072] 32a Outer Peripheral Surface

[0073] 33. Torso

[0074] 33a Outer peripheral surface

[0075] 34 External thread

[0076] 35 Storage Department

[0077] 35a Inner circumferential surface

[0078] 35b bottom surface

[0079] 36 Through holes

[0080] 36a Inner circumferential surface

[0081] 37. Slit

[0082] 4. Holding section

[0083] 41. Maintain the main body

[0084] 41a Inner circumferential surface

[0085] 42 Rear end

[0086] 5. Connector

[0087] 6 cylinders

[0088] 61 Cylinder Body

[0089] 62 Interior Space

[0090] 7 Installation Department

[0091] 71 Installation Main Body

[0092] 71a Inner circumferential surface

[0093] 72 Internal Thread

[0094] 8, 9 Fixed components

[0095] F Fastening force

[0096] S Storage Space

[0097] x-axis

Claims

1. A clamping device, characterized in that, include: A chuck with a storage section extending around its axis; Multiple claws are detachably installed in the receiving part to clamp the workpiece in a radial direction orthogonal to the axis. as well as The retaining part holds the chuck from the outer peripheral side in the radial direction; The chuck is secured from the outer periphery by the retaining portion, thereby clamping the workpiece between the plurality of jaws in the radial direction.

2. The clamping device as described in claim 1, characterized in that, The storage space for storing the workpiece is defined by the multiple claws.

3. The clamping device as described in claim 1, characterized in that, The three claws are arranged circumferentially.

4. The clamping device as described in claim 3, characterized in that, All of the claws have the same structure.

Images