Machining and positioning tool for thin-wall annular workpiece

Abstract

A placing seat is fixed to the upper portion of a base through a plurality of supporting columns in a suspended mode, a plurality of linear sliding grooves distributed in an annular array mode are formed in the placing seat, and an inner supporting piece and an outer pressing piece are installed in each linear sliding groove; a clamping push plate is connected between the multiple supporting columns in an up-down sliding and sleeving mode, a plurality of pushing pieces are installed on the clamping push plate, the pushing pieces are in sliding connection with the inner supporting piece and the outer pressing piece, and a plurality of position adjusting mechanisms distributed in an annular array are installed below the containing base in a sliding mode; a plurality of inner supporting pieces and outer pressing pieces which are distributed in an annular array mode are arranged above the containing base, two positioning rollers on the inner supporting pieces and the outer pressing pieces can synchronously move in the opposite directions from the inner side and the outer side, the inner wall and the outer wall of a workpiece are clamped at the same time, clamping force appears in pairs, radial force is offset, the workpiece mainly bears uniform centripetal force, and the deformation risk is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machining clamps, in particular to a thin-walled annular workpiece machining positioning tool. BACKGROUND

[0002] At present, when the annular workpiece is machined, a three-jaw chuck is usually used to position and clamp the workpiece. The three-jaw chuck converts the rotary motion into the synchronous and radial linear motion of the three clamping jaws through a plane thread (Archimedes spiral disc), so that the three clamping jaws can move synchronously inward or outward, thereby realizing the automatic centering and clamping of the workpiece. However, this clamping method is suitable for annular workpieces with thick walls. When it clamps and positions the thin-walled annular workpiece, the clamping force of the three clamping jaws points to the center of the circle at the contact point, which causes the elastic deformation of the workpiece to tend to be a regular triangle between the clamping jaws. In addition, the standard clamping jaw is point or line contact, and the unit area pressure is huge. When the clamping force of the clamping jaw is large, the outer wall of the workpiece is easily deformed inward. Therefore, a thin-walled annular workpiece machining positioning tool is designed. SUMMARY

[0003] The thin-walled annular workpiece machining positioning tool provided by the present application solves the above problems.

[0004] In order to achieve the above purpose, the present application adopts the following technical scheme: A thin-walled annular workpiece machining positioning tool, comprising a base, a placing seat is suspended and fixed above the base through a plurality of supporting columns, a plurality of groups of linear sliding grooves are arranged in an annular array on the placing seat, an inner supporting piece and an outer pressing piece are installed in each linear sliding groove, a clamping push plate is slidably connected between the supporting columns, a plurality of pushers are installed on the clamping push plate and are respectively below the linear sliding grooves, the pushers are slidably connected with the inner supporting piece and the outer pressing piece, a plurality of position adjusting mechanisms are slidably connected below the placing seat and are arranged in an annular array, the position adjusting mechanisms are slidably connected with the pushers, a driving structure is installed below the placing seat and is connected with the position adjusting mechanisms, a clamping cylinder is installed above the base, and the push rod of the clamping cylinder is fixed with the clamping push plate.

[0005] Further, the outer pressing piece comprises a guide sliding rod fixed on the lower surface of the placing seat, a translation plate is slidably connected on the guide sliding rod, a positioning roller is fixed on the translation plate, and the positioning roller passes through the linear sliding groove and is arranged above the placing seat. The structure of the inner supporting piece is the same as that of the outer pressing piece, and the two are symmetrically distributed.

[0006] Further, the translation plate is provided with a translation slot arranged obliquely, the translation slot in the inner support member and the translation slot in the outer pressing member are symmetrically distributed, the height of one end of the two translation slots close to each other is lower than the height of the other end of the two translation slots far from each other, that is, the translation slot in the inner support member and the translation slot in the outer pressing member are in an inverted eight-shaped structure.

[0007] Further, the pushing member comprises a straight rail fixed above the clamping push plate, two straight sliding blocks are slidingly installed on the straight rail, a group of stands are fixed above each straight sliding block, each group of stands comprises two stands symmetrically arranged on both sides of the translation plate, a pushing roller is installed between the two stands, and the pushing rollers in the two groups of stands are slidingly inserted into the translation slots of the translation plates of the corresponding inner support member and outer pressing member. When the clamping push plate moves upward under the action of the clamping cylinder, the multiple stands above the clamping push plate will drive the pushing rollers to move upward together, since the translation plate is linearly slidingly installed below the placement seat through the guide sliding rod, the translation plate can only move close to or away from the center of the placement seat along the guide sliding rod, and when the pushing rollers move upward, they will move upward along the translation slots on the translation plate, so that the two translation plates in the inner support member and the outer pressing member will move close to each other, and the positioning rollers on the translation plates of the inner support member and the outer pressing member will also move close to each other.

[0008] Further, the position adjusting mechanism comprises two straight sliding plates slidingly installed on the lower surface of the placement seat, the two straight sliding plates are symmetrically arranged about the straight rail, two groups of vertically distributed lifting slots are formed in the straight sliding plates, and the pushing rollers on the two groups of stands are slidingly inserted into the corresponding lifting slots. A straight push plate is installed below each straight sliding plate, an adjusting slot is formed in the straight push plate in an oblique arrangement, and the adjusting slots in the two straight push plates are arranged in the same position.

[0009] Further, an extension is integrally formed above the side surface of the straight sliding plate away from the stand, a guide slot is formed in the extension in a penetrating manner, a guide sliding block is slidingly inserted into the guide slot, the guide sliding block is fixed to the lower surface of the placement seat through a screw, and the guide sliding block can guide the linear movement of the straight sliding plate, so that the straight sliding plate can only move linearly close to or away from the center of the placement seat.

[0010] Further, one of the straight sliding plates is provided with a laser ranging sensor through a support, a ranging plate is vertically arranged downward below the placement seat, the side surface of the ranging plate facing the laser ranging sensor is coplanar with the axis of the center of the placement seat, and the ranging plate and the laser ranging sensor are vertically arranged. The emitting end of the laser ranging sensor is located in the middle position of the two positioning rollers in the inner support and the outer pressing part, the length measured by the laser ranging sensor is the sum of the half thickness of the workpiece wall thickness and the workpiece inner diameter, that is, the length L measured by the laser ranging sensor is (R outer diameter-R inner diameter) / 2+R inner diameter, so that the distance between the two positioning rollers in the inner support and the outer pressing part and the outer side wall and the inner side wall of the workpiece is consistent, so that the two positioning rollers can be in contact with the inner wall and the outer wall of the workpiece at the same time, and the deformation of the workpiece caused by inconsistent position during clamping is avoided.

[0011] Further, the ring-shaped track is fixed below the placing seat by screws, the rotating ring is rotatably installed below the ring-shaped track through a sliding block, a plurality of groups of driving members are fixed below the rotating ring, each group of driving members comprises two driving rollers, and the driving rollers are slidingly inserted into the adjusting sliding grooves of the corresponding linear push plates, When the rotating ring rotates counterclockwise, the driving rollers on the rotating ring will deflect counterclockwise, so that the linear push plates and the linear sliding plates move linearly towards the center of the placing seat, so that the stand and the pushing roller connected with the linear sliding plate can move linearly along the linear track towards the inside, and the translation plates in the inner support and the outer pressing part will move linearly towards the inside under the action of the horizontally moving pushing roller, that is, the inner support and the outer pressing part move linearly towards the inside together with the linear sliding plate, so as to change the distance between the inner support, the outer pressing part and the center of the placing seat, and the device is suitable for clamping and positioning of workpieces of various sizes and thicknesses.

[0012] Further, a plurality of ring-shaped array distribution driving tooth grooves are formed in the inner ring of the rotating ring, a servo motor is installed above the base, a driving gear is installed on the output shaft of the servo motor, the driving gear is engaged with the driving tooth groove, and the output shaft of the servo motor is reversely rotated to make the rotating ring rotate clockwise or counterclockwise correspondingly.

[0013] The beneficial effects of the present application are as follows: 1. By arranging a plurality of ring-shaped array distribution inner supports and outer pressing parts above the placing plate, cooperating with the clamping push plate and the pushing member, the two positioning rollers on the inner support and the outer pressing part will move towards each other from the inner and outer sides at the same time, and clamp the inner wall and the outer wall of the workpiece at the same time, the clamping force appears in pairs, and the radial force is offset, so that the workpiece mainly bears the uniform centripetal force, greatly reduces the risk of deformation, and ensures the integrity of the workpiece. 2. A plurality of position adjusting mechanisms are arranged below the placing plate, the plurality of position adjusting mechanisms are slidingly connected with the plurality of corresponding inner supports and outer pressing parts, the distance between the inner support, the outer pressing part and the center of the placing plate can be adjusted as required, and the device is suitable for clamping and positioning of workpieces of various sizes and thicknesses. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1A front view of a thin-walled annular workpiece machining positioning tooling proposed in the present application; Figure 2 An exploded view of a thin-walled annular workpiece machining positioning tooling proposed in the present application; Figure 3 A Figure 2 Structure diagram of the driving structure and the inner support, the outer pressure piece and the position adjusting mechanism; Figure 4 A Figure 3 Structure diagram of the clamping push plate and the inner support, the outer pressure piece and the position adjusting mechanism; Figure 5 A Figure 4 Structure diagram of the inner support, the outer pressure piece and the position adjusting mechanism; Figure 6 A Figure 5 Structure diagram of the inner support and the outer pressure piece; Figure 7 Bottom view of the driving structure and the inner support, the outer pressure piece and the position adjusting mechanism; Figure 8 A Figure 7 Bottom view of the driving structure and the inner support, the outer pressure piece and the position adjusting mechanism; Figure 9 A Figure 1 Sectional view.

[0015] Figure reference: 1, base; 11, support column; 2, placement seat; 21, straight sliding groove; 22, annular track; 3, inner support; 4, outer pressure piece; 41, positioning roller; 42, translation plate; 421, translation sliding groove; 43, guide sliding rod; 5, clamping push plate; 51, straight rail; 511, straight sliding block; 52, stand; 53, push roller; 6, position adjusting mechanism; 61, straight sliding plate; 611, lifting sliding groove; 62, straight push plate; 621, adjusting sliding groove; 63, extension; 631, guide sliding groove; 632, guide sliding block; 64, laser ranging sensor; 65, ranging plate; 7, driving structure; 71, rotating ring; 711, driving gear slot; 72, driving gear; 721, servo motor; 73, driving roller; 8, clamping cylinder. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments.

[0017] Reference Figure 1 - Figure 9The utility model relates to a kind of thin-wall annular workpiece machining positioning tool, including base 1, and the placing seat 2 is suspendedly fixed on base 1 by multiple support columns 11, multiple groups of annular array distribution linear sliding grooves 21 are opened in placing seat 2, inner support piece 3, outer pressure piece 4 are installed in each linear sliding groove 21, clamping push plate 5 is slidably connected between multiple support columns 11, multiple pushers are installed on clamping push plate 5, and multiple pushers are respectively below multiple linear sliding grooves 21, pusher and inner support piece 3, outer pressure piece 4 are slidably connected, multiple position adjusting mechanisms 6 are slidably installed below placing seat 2 in annular array distribution, multiple position adjusting mechanisms 6 are slidably connected with multiple pushers respectively, and driving structure 7 is installed below placing seat 2, and driving structure 7 is connected with multiple position adjusting mechanisms 6, clamping cylinder 8 is installed above base 1, and the push rod of clamping cylinder 8 is fixed with clamping push plate 5.

[0018] Refer to Figure 1 Figure 6 , outer pressure piece 4 includes guiding slide rod 43 fixed on the lower surface of placing seat 2, and guiding slide rod 43 is slidably connected with translation plate 42, and positioning roller 41 is fixed on translation plate 42, and positioning roller 41 is placed above placing seat 2 through linear sliding groove 21. The structure of inner support piece 3 is same with the structure of outer pressure piece 4, and they are symmetrically distributed.

[0019] Inclined translation sliding groove 421 is opened in translation plate 42, and translation sliding groove 421 in inner support piece 3 and translation sliding groove 421 in outer pressure piece 4 are symmetrically distributed, and the height of one end of two translation sliding grooves 421 close to each other is lower than the height of one end of two translation sliding grooves 421 far from each other, that is, translation sliding groove 421 in inner support piece 3 and translation sliding groove 421 in outer pressure piece 4 are inverted eight-shaped structure.

[0020] Refer to Figure 4 Figure 7 , pusher includes linear rail 51 fixed above clamping push plate 5, two linear sliding blocks 511 are slidably installed on linear rail 51, a group of stand 52 is fixed above each linear sliding block 511, each group of stand 52 includes two stands 52 symmetrically arranged on both sides of translation plate 42, and push roller 53 is installed between two stands 52, and push roller 53 in two groups of stand 52 is slidably inserted into the translation sliding groove 421 of the translation plate 42 of corresponding inner support piece 3 and outer pressure piece 4 respectively. ​​When the clamping push plate 5 moves upwards under the action of the clamping air cylinder 8, the plurality of stands 52 above the clamping push plate 5 will drive the push rollers 53 to move upwards together. Since the translation plate 42 is linearly slidably installed below the placement seat 2 through the guide slide rod 43, the translation plate 42 can only move close to or away from the center of the placement seat 2 along the guide slide rod 43, and when the push roller 53 moves upwards, it will move upwards along the translation sliding groove 421 on the translation plate 42, and the translation sliding groove 421 in the inner support 3 and the translation sliding groove 421 in the outer pressing piece 4 are in an inverted m-shaped structure, therefore, when the push roller 53 moves upwards, the two translation plates 42 in the inner support 3 and the outer pressing piece 4 will move close to each other, and the positioning rollers 41 on the translation plates 42 of the inner support 3 and the outer pressing piece 4 will also move close to each other, thereby clamping and fixing the workpiece between the two positioning rollers 41 on the inner support 3 and the outer pressing piece 4. The two positioning rollers 41 will move towards each other from the inside and outside, and finally clamp the inner wall and the outer wall of the workpiece at the same time, the clamping force appears in pairs and cancels out the radial force, so that the workpiece mainly bears the uniform centripetal force, greatly reducing the risk of deformation. Conversely, when the clamping push plate 5 moves downwards under the action of the clamping air cylinder 8, the translation plates 42 and the positioning rollers 41 on the inner support 3 and the outer pressing piece 4 will also move away from each other, thereby releasing the clamping and fixing of the workpiece, and the workpiece can be removed.

[0021] Referring to Figure 3 Figure 9 The position adjusting mechanism 6 comprises two linear sliding plates 61 slidably installed on the lower surface of the placement seat 2, the two linear sliding plates 61 are symmetrically arranged about the linear rail 51, and two groups of vertically distributed lifting sliding grooves 611 are formed in the linear sliding plate 61; the push rollers 53 on the two groups of stands 52 are respectively slidably inserted into the corresponding lifting sliding grooves 611. A linear push plate 62 is installed below each linear sliding plate 61, and an inclined adjusting sliding groove 621 is formed in the linear push plate 62; the adjusting sliding grooves 621 in the two linear push plates 62 are arranged in the same position.

[0022] An extension 63 is integrally formed above the surface of the linear sliding plate 61 away from the stand 52, a guide sliding groove 631 is formed in the extension 63, a guide sliding block 632 is slidably inserted into the guide sliding groove 631, and the guide sliding block 632 is fixed to the lower surface of the placement seat 2 through a screw. The guide sliding block 632 can guide the linear movement of the linear sliding plate 61, so that it can only move linearly towards or away from the center of the placement seat 2.

[0023] ​One of the linear slide 61 side through the support is equipped with laser ranging sensor 64, the placement seat 2 below is provided with vertical downward distribution ranging board 65, ranging board 65 towards laser ranging sensor 64 side surface and the center of the placement seat 2 axis coplanar, and ranging board 65 and laser ranging sensor 64 vertical distribution; The emitting end of the laser ranging sensor 64 is located in the middle position of the two positioning rollers 41 in the inner support 3 and the outer pressing piece 4. The length measured by the laser ranging sensor 64 is the sum of half the thickness of the workpiece wall thickness and the workpiece inner diameter, that is, the length L measured by the laser ranging sensor 64 is (R 外径 -R 内径 ) / 2+R inner diameter, so as to ensure that the distance between the two positioning rollers 41 in the inner support 3 and the outer pressing piece 4 and the outer and inner walls of the workpiece is consistent, so that the two positioning rollers 41 can be in contact and positioned with the inner and outer walls of the workpiece at the same time, avoiding the deformation of the workpiece caused by inconsistent position when clamping.

[0024] The placement seat 2 below is fixed with an annular track 22, and the annular track 22 below is rotatably installed with a rotating ring 71 through a sliding block, and the rotating ring 71 below is fixed with a plurality of groups of annular array distribution driving pieces, each group of driving pieces includes two driving rollers 73, the driving rollers 73 are slidingly inserted into the adjusting sliding groove 621 of the corresponding linear push plate 62, When the rotating ring 71 rotates counterclockwise, the driving rollers 73 located on the rotating ring 71 will deflect counterclockwise, since the linear push plate 62 is fixed with the linear slide 61, and the linear slide 61 and the linear push plate 62 can only move linearly towards the center of the placement seat 2 under the action of the guide sliding block 632, therefore, the counterclockwise deflected driving rollers 73 will push the linear push plate 62, so that the linear push plate 62 and the linear slide 61 move linearly towards the center of the placement seat 2, so that the stand 52 and the pushing roller 53 connected with the linear slide 61 can move horizontally and linearly inward along the linear track 51, and the horizontally and linearly moving pushing roller 53 will make the translation plate 42 have two possibilities of moving horizontally inward or vertically downward in the translation sliding groove 421, since the guide sliding rod 43 is arranged to make the translation plate 42 only horizontally and linearly move but not vertically move, therefore, the translation plate 42 in the inner support 3 and the outer pressing piece 4 will horizontally and linearly move inward under the action of the horizontally moving pushing roller 53, that is, the inner support 3 and the outer pressing piece 4 move linearly inward together with the linear slide 61, so as to change the distance between the inner support 3, the outer pressing piece 4 and the center of the placement seat 2, which is suitable for clamping and positioning of workpieces of various sizes and thicknesses.

[0025] A plurality of annular array distribution driving tooth grooves 711 are arranged in the inner ring of the rotating ring 71. A servo motor 721 is installed above the base 1. A driving gear 72 is installed on the output shaft of the servo motor 721. The driving gear 72 is engaged with the driving tooth grooves 711. The clockwise or counterclockwise rotation of the output shaft of the servo motor 721 enables the rotating ring 71 to rotate clockwise or counterclockwise correspondingly.

[0026] Working principle: Before clamping and positioning the workpiece, the inner diameter and the outer diameter of the annular workpiece are measured by using a measuring tool. Then, the initial positions of the inner supporting part 3 and the outer pressing part 4 are calculated according to the formula L=(R 外径 -R 内径 ) / 2+R inner diameter. Specifically, the power supply of the servo motor 721 is turned on. The rotating ring 71 is rotated counterclockwise by the servo motor 721 and the driving gear 72. When the rotating ring 71 rotates counterclockwise, the driving roller 73 located on the rotating ring 71 will deflect counterclockwise. Since the linear push plate 62 and the linear slide plate 61 are fixed, and the linear slide plate 61 and the linear push plate 62 can only move linearly towards the center of the placement seat 2 under the action of the guide sliding block 632, the counterclockwise deflection of the driving roller 73 will push the linear push plate 62 to make the linear push plate 62 and the linear slide plate 61 move linearly towards the center of the placement seat 2, so that the stand 52 and the pushing roller 53 connected with the linear slide plate 61 can move horizontally and linearly inward along the linear track 51. The horizontal linear movement of the pushing roller 53 in the translation sliding groove 421 will make the translation plate 42 have two possibilities of horizontal movement inward or vertical movement downward. Since the guide sliding rod 43 is arranged to make the translation plate 42 only move horizontally and linearly and cannot move up and down, the translation plate 42 in the inner supporting part 3 and the outer pressing part 4 will move horizontally and linearly inward under the action of the horizontal pushing roller 53, that is, the inner supporting part 3 and the outer pressing part 4 move linearly inward together with the linear slide plate 61, so as to change the distance between the inner supporting part 3, the outer pressing part 4 and the center of the placement seat 2, so that the distance between the laser ranging sensor 64 and the ranging plate 65 is R outer diameter-R inner diameter / 2+R inner diameter, thereby ensuring that the distance between the two positioning rollers 41 in the inner supporting part 3 and the outer pressing part 4 and the outer side wall and the inner side wall of the workpiece is consistent, so that the two positioning rollers 41 can be in contact with the inner wall and the outer wall of the workpiece at the same time, avoiding the deformation of the workpiece caused by the inconsistent position during clamping.

[0027] After the workpiece is placed above the placement seat 2 and in the space formed by the positioning rollers 41 on the plurality of inner support members 3 and outer pressing members 4, the power supply of the clamping cylinder 8 is turned on, the push rod of the clamping cylinder 8 is elongated and drives the clamping push plate 5 to move upward together, when the clamping push plate 5 moves upward under the action of the clamping cylinder 8, the plurality of stands 52 above the clamping push plate 5 will drive the pushing rollers 53 to move upward together, since the translation plate 42 is linearly slidably installed below the placement seat 2 through the guide sliding rod 43, the translation plate 42 can only move close to or away from the center of the placement seat 2 along the guide sliding rod 43, and when the pushing rollers 53 move upward, they will move upward along the translation sliding groove 421 on the translation plate 42, and the translation sliding groove 421 in the inner support member 3 and the translation sliding groove 421 in the outer pressing member 4 are in an inverted eight-shaped structure; Therefore, when the pushing rollers 53 move upward, the two translation plates 42 in the inner support member 3 and the outer pressing member 4 will approach each other, and the positioning rollers 41 on the translation plates 42 of the inner support member 3 and the outer pressing member 4 will also approach each other, at this time, whether the positioning rollers 41 on the plurality of inner support members 3 first contact the inner wall of the workpiece or the positioning rollers 41 on the plurality of outer pressing members 4 first contact the outer wall of the workpiece, they will push the workpiece to move and center it on the center of the placement seat 2 above; And the two positioning rollers 41 on the inner support member 3 and the outer pressing member 4 clamp the inner wall of the workpiece at the same time, thereby clamping and fixing the workpiece between the two positioning rollers 41 on the inner support member 3 and the outer pressing member 4, the two positioning rollers 41 move synchronously from the inside and outside towards each other while clamping the inner wall of the workpiece, the clamping force appears in pairs and cancels out the radial force, so that the workpiece mainly bears uniform centripetal force, greatly reducing the risk of deformation, so that subsequent machining operations can be performed; After the machining is completed, when the clamping push plate 5 moves downward under the action of the clamping cylinder 8, the translation plates 42 and the positioning rollers 41 on the inner support member 3 and the outer pressing member 4 will move away from each other, releasing the clamping and fixing of the workpiece, so that the workpiece can be removed.

[0028] By setting a plurality of annularly arrayed inner support members 3 and outer pressing members 4 above the placement seat 2, cooperating with the clamping push plate 5 and the pushing member, the two positioning rollers 41 on the inner support member 3 and the outer pressing member 4 will move synchronously from the inside and outside towards each other while clamping the inner wall of the workpiece, the clamping force appears in pairs and cancels out the radial force, so that the workpiece mainly bears uniform centripetal force, greatly reducing the risk of deformation, and ensuring the integrity of the workpiece; By setting a plurality of position adjusting mechanisms 6 in a ring array below the placement seat 2, the plurality of position adjusting mechanisms 6 are slidably connected with the plurality of corresponding inner support members 3 and outer pressing members 4, which can adjust the distance between the inner support member 3, the outer pressing member 4 and the center of the placement seat 2 as needed, and are suitable for clamping and positioning workpieces of various sizes and thicknesses.

[0029] In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0030] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0031] The above description is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art within the technical scope disclosed by the present application, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change, should be covered in the protection scope of the present application.

Claims

1. A positioning fixture for machining thin-walled annular workpieces, characterized in that, Includes a base (1), above which a placement seat (2) is suspended and fixed by multiple support columns (11). The placement seat (2) has multiple sets of linear grooves (21) arranged in a circular array. Each linear groove (21) is equipped with an inner support member (3) and an outer pressure member (4). Clamping push plates (5) are slidably connected between the multiple support columns (11). Multiple pushing members are installed on the clamping push plates (5), each located below one of the multiple linear grooves (21). The pusher is slidably connected to the inner support (3) and the outer pressure (4). Multiple position adjustment mechanisms (6) arranged in a ring array are slidably installed below the placement seat (2). The multiple position adjustment mechanisms (6) are slidably connected to the multiple pushers. A drive structure (7) is installed below the placement seat (2). The drive structure (7) is connected to the multiple position adjustment mechanisms (6). A clamping cylinder (8) is installed above the base (1). The push rod of the clamping cylinder (8) is fixed to the clamping push plate (5).

2. The positioning fixture for machining a thin-walled annular workpiece according to claim 1, characterized in that, The external pressure component (4) includes a guide slide rod (43) fixed on the lower surface of the placement seat (2), a translation plate (42) is slidably sleeved on the guide slide rod (43), a positioning roller (41) is fixed on the translation plate (42), and the positioning roller (41) passes through the straight slide groove (21) and is placed above the placement seat (2); The structure of the inner support member (3) is the same as that of the outer pressure member (4), and the two are symmetrically distributed.

3. The positioning fixture for machining a thin-walled annular workpiece according to claim 2, characterized in that, The translation plate (42) is provided with an inclined translation groove (421). The translation groove (421) in the inner support member (3) and the translation groove (421) in the outer pressure member (4) are symmetrically distributed. The height of the two translation grooves (421) at the end closer to each other is lower than the height of the two translation grooves (421) at the end further away from each other.

4. The positioning fixture for machining a thin-walled annular workpiece according to claim 3, characterized in that, The pusher includes a linear track (51) fixed above the clamping push plate (5). Two linear sliders (511) are slidably installed on the linear track (51). Each linear slider (511) has a set of uprights (52) fixed above it. Each set of uprights (52) includes two uprights (52) symmetrically arranged on both sides of the translation plate (42). A push roller (53) is installed between the two uprights (52). The push rollers (53) in the two sets of uprights (52) are slidably inserted into the translation grooves (421) of the translation plate (42) of the corresponding inner support (3) and outer pressure (4).

5. The positioning fixture for machining a thin-walled annular workpiece according to claim 4, characterized in that, The position adjustment mechanism (6) includes two linear slide plates (61) that are slidably installed on the lower surface of the placement seat (2). The two linear slide plates (61) are symmetrically arranged about the linear track (51). Two sets of vertically distributed lifting grooves (611) are provided on the linear slide plates (61). The push rollers (53) on the two sets of uprights (52) are slidably inserted into the corresponding lifting grooves (611). Each of the linear slide plates (61) is fitted with a linear push plate (62) below it. The linear push plate (62) is provided with an inclined adjustment groove (621). The adjustment grooves (621) in the two linear push plates (62) are in the same position.

6. The positioning fixture for machining a thin-walled annular workpiece according to claim 5, characterized in that, The linear slide plate (61) has an extension (63) integrally formed above the side surface away from the stand (52). The extension (63) has a guide groove (631) extending through it vertically. A guide slider (632) is slidably inserted into the guide groove (631). The guide slider (632) is fixed to the lower surface of the placement seat (2) by screws.

7. The positioning fixture for machining a thin-walled annular workpiece according to claim 5, characterized in that, A laser rangefinder sensor (64) is mounted on the side of one of the linear slide plates (61) via a bracket, and a rangefinder plate (65) is arranged vertically downward below the placement seat (2). The emitting end of the laser rangefinder (64) is located in the middle of the two positioning rollers (41) in the inner support (3) and outer pressure (4). The length measured by the laser rangefinder (64) is the sum of half the thickness of the workpiece wall and the inner diameter of the workpiece.

8. The positioning fixture for machining a thin-walled annular workpiece according to claim 5, characterized in that, The placement seat (2) is fixed with screws to a ring track (22). A rotating ring (71) is mounted below the ring track (22) by a slider. Multiple sets of driving components are fixed below the rotating ring (71) in a ring array. Each set of driving components includes two driving rollers (73). The driving rollers (73) are slidably inserted into the adjustment groove (621) of the corresponding linear push plate (62).

9. A positioning fixture for machining a thin-walled annular workpiece according to claim 8, characterized in that, The inner ring of the rotating ring (71) has multiple drive tooth grooves (711) arranged in a ring array. A servo motor (721) is installed above the base (1). A drive gear (72) is installed on the output shaft of the servo motor (721). The drive gear (72) meshes with the drive tooth groove (711).

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