Tool clamp capable of achieving accurate positioning based on small holes in thin-wall part

Abstract

The utility model discloses a work fixture for realizing accurate positioning based on a small hole on a thin-walled workpiece, which comprises an accurate positioning device, a fixed clamping device and an auxiliary fixed clamping device, the accurate positioning device controls a piston rod with a thread to move up and down through a needle-shaped air cylinder, the piston rod with the thread ascends to a certain height to realize the disassembly and assembly with a conical chuck, and the auxiliary fixed clamping device is used for clamping the small hole on the thin-walled workpiece. The conical chuck is driven to move downwards by a certain distance, so that the inner support expansion pin can be uniformly expanded in the radial direction, the thin-wall part is tightly filled by the inner diameter expansion pin, and accurate positioning of the thin-wall part is realized; the fixed clamping device controls a pressing head through a clamping air cylinder and applies certain pressure to clamp the thin-wall part. According to the auxiliary fixing and supporting device, a double-shaft air cylinder, a rodless air cylinder, a small air cylinder and a rodless air cylinder base are matched to achieve movement in the X direction, the Y direction and the Z direction, so that the device can support the thin-wall part with weak rigidity from multiple directions and different angles, and the machining quality of the thin-wall part is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of thin-walled workpiece processing, in particular to a tooling fixture for achieving precise positioning based on a small hole on a thin-walled workpiece. Background Art

[0002] In the field of mechanical manufacturing, metal cutting processing of thin-walled parts has always been difficult. In actual production, thin-walled parts need to be positioned and clamped before cutting. Since some thin-walled parts only have small holes, when using cylindrical pins for positioning, in order to facilitate the removal and placement of workpieces, the diameter of the cylindrical pin is usually slightly smaller than the diameter of the small hole, which makes it difficult to completely clamp the thin-walled part. It is also difficult to add material between the cylindrical pin and the small hole to clamp it, causing the thin-walled part to have slight movement in the plane direction, making it difficult to accurately position the thin-walled part. When using conical pins for positioning, due to certain errors in the processing of the small hole and the influence of the placement of the conical pin, the contact point between the thin-walled part and the conical pin may not be on the same horizontal plane, resulting in a certain tilt of the thin-walled part. These two traditional positioning methods make it difficult to achieve the effect of precise positioning of thin-walled parts with only small holes. Therefore, it is very necessary to design a tooling fixture that can achieve precise positioning based on the small holes on thin-walled parts. Utility Model Content

[0003] The purpose of the utility model is to solve the technical problem of inaccurate positioning of small holes on thin-walled parts in the prior art, and to provide a fixture that can achieve accurate positioning based on small holes on thin-walled parts.

[0004] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0005] The cam is provided with a threaded hole, and the threaded hole is provided at the center of the cam, and the threaded hole is provided below the cam.

[0006] The fixing and tightening device comprises a clamping cylinder body, a clamping cylinder piston rod, and a pressure head.

[0007] The auxiliary fixed support device includes a dual-axis cylinder body, a dual-axis cylinder piston rod, a rodless cylinder guide rail, a rodless cylinder body, a rodless cylinder base, a small cylinder body, and a small cylinder piston rod. The rodless cylinder base includes a side plate, a steel wheel axle, a steel wheel, and a bottom plate. Holes are set in the center of the side surface of the side plate and the side surface of the bottom plate. The steel wheel axle can be inserted into the two holes. The steel wheel axle and the steel wheel are used together. The bottom surface of the rodless cylinder guide rail is connected to the top surface of the rodless cylinder base, and the bottom surface of the small cylinder body is connected to the top surface of the rodless cylinder body.

[0008] Furthermore, the support block includes a support block upper plate, pillars, and a support block lower plate. A stepped hole is set in the center of the support block upper plate. From top to bottom, the inner diameter expansion pin is placed in the first section of the stepped hole, the threaded needle-type cylinder piston rod can be passed through the second section of the stepped hole, and a thread is set at the end of the third section of the stepped hole, and the aperture of the second step hole is smaller than the aperture of the first section of the stepped hole and the aperture of the third section of the stepped hole. There are 4 pillars connecting the support block upper plate and the support block lower plate.

[0009] Furthermore, the inner diameter expansion pin is provided with a stepped hole, the first section of the stepped hole is a tapered hole expanding outward, and the second section of the stepped hole is a straight hole, which can pass through a threaded needle-type cylinder piston rod. The aperture of the second section of the stepped hole is smaller than the minimum aperture of the first section of the stepped hole. Annular cutting is adopted on the periphery of the boundary between the first section of the stepped hole and the second section of the stepped hole of the inner diameter expansion pin to remove part of the material, and then radial drilling is performed. Part of the material is cut off in a cross form along the axial direction to reduce the rigidity of the upper part of the inner diameter expansion pin. A threaded hole is provided in the center of the tapered chuck, the maximum outer diameter is equal to the maximum outer diameter of the first step hole of the inner diameter expansion pin, the minimum outer diameter is less than or equal to the minimum inner diameter of the first step hole of the inner diameter expansion pin, and is larger than the aperture of the second step hole of the inner diameter expansion pin. The length of the tapered chuck is less than the length of the first section of the stepped hole of the inner diameter expansion pin.

[0010] In the above technical solution, the utility model provides a fixture for achieving precise positioning based on a small hole on a thin-walled part, which has the following beneficial effects:

[0011] 1. The utility model cooperates with the small holes on the thin-walled parts through two or three precise positioning devices and prevents the thin-walled parts from moving in the horizontal direction, thereby achieving precise positioning of the thin-walled parts processing, improving production efficiency, and ensuring that the quality of the thin-walled parts meets production requirements.

[0012] 2. The utility model arranges multiple auxiliary fixing support devices from different directions and angles at the weak rigidity points of the thin-walled parts, thereby achieving further fixation and clamping of the thin-walled parts and avoiding excessive stress deformation during the processing of the thin-walled parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A three-dimensional diagram of a fixture for achieving precise positioning based on a small hole on a thin-walled part provided in an embodiment of the utility model.

[0014] Figure 2 A cross-sectional view of the assembly of a precise positioning device and a thin-walled part in a fixture for achieving precise positioning based on a small hole on the thin-walled part provided in an embodiment of the utility model.

[0015] Figure 3 A schematic structural diagram of a fixing clamping device in a fixture for achieving precise positioning based on a small hole on a thin-walled part provided in an embodiment of the utility model.

[0016] Figure 4 This is a schematic structural diagram of an auxiliary fixing support device in a tooling fixture for achieving precise positioning based on a small hole on a thin-walled part, provided in an embodiment of the present utility model.

[0017] Figure 5 A top view of a rodless cylinder base in a fixture for achieving precise positioning based on a small hole in a thin-walled part, provided in an embodiment of the utility model.

[0018] In the picture:

[0019] 1. Thin-walled parts; 2. Precision positioning device; 3. Fixing and clamping device; 4. Auxiliary fixing and supporting device.

[0020] 21. Support block; 22. Threaded needle-type cylinder body; 23. Threaded needle-type cylinder piston rod; 24. Inner diameter expansion pin; 25. Tapered chuck; 31. Clamping cylinder body; 32. Clamping cylinder piston rod; 33. Press head; 41. Double-axis cylinder body; 42. Double-axis cylinder piston rod; 43. Rodless cylinder guide rail; 44. Rodless cylinder body; 45. Rodless cylinder base; 46. Small cylinder body; 47. Small cylinder piston rod.

[0021] 211. Support block upper plate; 212. Pillar; 213. Support block lower plate; 451. Side plate; 452. Bottom plate; 453. Steel wheel; 454. Steel wheel shaft. DETAILED DESCRIPTION

[0022] In order to make those skilled in the art better understand the technical solution of the present invention, Figure 1 To the attached Figure 4 The utility model is further introduced in detail.

[0023] A tool fixture for achieving precise positioning based on small holes on thin-walled parts, comprising a thin-walled part 1, a precise positioning device 2, a fixing clamping device 3, and an auxiliary fixing support device 4, wherein the precise positioning device 2 comprises a support block 21, a threaded needle-type cylinder body 22, a threaded needle-type cylinder piston rod 23, an inner diameter expansion pin 24, and a tapered chuck 25, wherein the support block 21 comprises a support block upper plate 211, a pillar 212, and a support block lower plate 213, a stepped hole is provided in the center of the support block upper plate 211, from top to bottom, the inner diameter expansion pin 24 is placed in the first section of the stepped hole, the second section of the stepped hole can pass through the threaded needle-type cylinder piston rod 23, and a thread is provided at the end of the third section of the stepped hole for threaded connection with the threaded needle-type cylinder body, and the aperture of the second stepped hole is smaller than the aperture of the first section of the stepped hole and the aperture of the third section of the stepped hole, and there are four pillars 212 connecting the support block upper plate 211 and the support block lower plate 213.

[0024] The inner diameter expansion pin 24 is provided with a stepped hole. The first section of the stepped hole is a tapered hole expanding outward. A tapered chuck 25 can be placed in this area. The second section of the stepped hole is a straight hole. The aperture of the second section of the stepped hole is smaller than the minimum aperture of the first section of the stepped hole. It is a clearance fit with the threaded needle-type cylinder piston rod 23, making the positioning more accurate and the connection tighter. Annular cutting is used on the periphery of the boundary between the first section of the stepped hole and the second section of the stepped hole of the inner diameter expansion pin 24 to remove part of the material, and then drilling is performed radially. Part of the material is cut off in a cross form along the axial direction to reduce the rigidity of the upper part of the inner diameter expansion pin 24, so that the inner diameter expansion pin 24 can expand evenly in the radial direction more easily when subjected to axial force.

[0025] The center hole of the tapered chuck 25 is provided with a section of thread, the maximum outer diameter is equal to the maximum outer diameter of the first stepped hole of the inner diameter expansion pin 24, the minimum outer diameter is less than or equal to the minimum inner diameter of the first stepped hole of the inner diameter expansion pin 24, and is larger than the aperture of the second stepped hole of the inner diameter expansion pin 24, and the length of the tapered chuck 25 is less than the length of the first stepped hole of the inner diameter expansion pin 24.

[0026] The support block 21, the threaded needle-type cylinder body 22 and the threaded needle-type cylinder piston rod 23 are assembled, and two or three are placed under the small hole of the thin-walled part 1, so that the threaded needle-type cylinder piston rod 23 passes through the small hole of the thin-walled part 1. By making the threaded piston rod 23 reach the upward limit under the action of the air path, a corresponding number of inner diameter expansion pins 24 are placed in the small hole of the thin-walled part 1 to achieve rough positioning of the thin-walled part 1. The tapered chuck 25 and the threaded needle-type cylinder piston rod 23 are tightly connected by threads. Through the action of the air path, the threaded needle-type cylinder piston rod 23 drives the tapered chuck 25 downward. When the tapered chuck 25 just completely enters the inner diameter expansion pin 24, the tapered chuck 25 continues to move downward, so that the inner diameter expansion pin 24 is subjected to axial force, and the uppermost part expands evenly in the radial direction until it completely fills the small hole of the clamping thin-walled part 1, so that the thin-walled part 1 is fixed in the horizontal direction to achieve precise positioning.

[0027] The fixing and clamping device 3 includes a clamping cylinder body 31, a clamping cylinder piston rod 32, and a pressure head 33. The pressure head 33 is moved up and down in the vertical direction or rotated in the horizontal direction through the action of the air circuit, and the pressure head is moved to a position close to the thin-walled part 1. A certain pressure is continued to be applied to fix the thin-walled part 1.

[0028] The auxiliary fixing support device 4 includes a double-axis cylinder body 41, a double-axis cylinder piston rod 42, a rodless cylinder guide rail 43, a rodless cylinder body 44, a rodless cylinder base 45, a small cylinder body 46, a small cylinder piston rod 47, and the rodless cylinder base 45 includes a side plate 451, a steel wheel shaft 452, a steel wheel 453, and a bottom plate 454. The side of the side plate 451 and the center of the side of the bottom plate 454 are provided with holes, and the steel wheel shaft 452 can be inserted into the two holes. The steel wheel shaft 452 and the steel wheel 4 53 are used in conjunction with each other, the bottom surface of the rodless cylinder guide rail 43 is connected to the top surface of the rodless cylinder base 45, so that the rodless cylinder as a whole can move more quickly and smoothly in the horizontal direction, and the bottom surface of the small cylinder body 46 is connected to the top surface of the rodless cylinder body 44, so that the dual-axis cylinder piston rod 42 pushes the rodless cylinder as a whole to move in the X direction, the rodless cylinder body 44 moves in the Y direction, and the small cylinder piston rod 47 moves in the Z direction, so that the auxiliary fixing support device 4 can be adjusted to the weak point of the thin-walled part 1.

[0029] The auxiliary supporting device 4 can be provided in plurality and arranged at the weak rigidity places of the thin-walled component 1 .

[0030] The number of the support blocks 21 can be greater than the number of small holes required for precise positioning, and is used to support the thin-walled component 1 .

[0031] The working process of this utility model is mainly divided into precise positioning, fixed clamping and auxiliary fixed support:

[0032] Precise positioning: Two to three precise positioning devices 2 are assembled with the thin-walled part 1, and the inner diameter expansion pin 24 realizes the rough positioning of the thin-walled part. The needle cylinder is started simultaneously or separately to drive the threaded needle cylinder piston rod 23 and the tapered chuck 25 to move up and down. When the tapered chuck 25 just completely enters the inner diameter expansion pin 24, the tapered chuck 25 continues to move downward, so that the inner diameter expansion pin 24 is subjected to axial force, and the uppermost part expands evenly in the radial direction until it completely fills the small hole of the clamping thin-walled part 1, so that the thin-walled part 1 is fixed in the horizontal direction to achieve precise positioning.

[0033] Fixed clamping: The pressure head 33 is moved up and down in the vertical direction or rotated in the horizontal direction through the action of the air path, and the pressure head is moved to a position close to the thin-walled part 1. A certain pressure is continued to be applied to fix the thin-walled part 1.

[0034] Auxiliary fixing support: After the auxiliary fixing support device 4 is assembled, multiple such devices can be arranged from different directions and angles. By making the dual-axis cylinder piston rod 42 push the rodless cylinder as a whole to move in the X direction, the rodless cylinder body 44 to move in the Y direction and the small cylinder piston rod 47 to move in the Z direction, the auxiliary fixing support device 4 can be adjusted to the weak rigidity of the thin-walled part 1, thereby playing the role of auxiliary fixing and supporting the thin-walled part.

[0035] Those skilled in the art will appreciate that other similar connection methods can also implement the present invention, such as welding, bonding or screwing, and other similar power devices can also implement the present invention, such as hydraulic devices. This device can be used for precise positioning and fixed clamping of small holes in thin-walled parts, can replace the corresponding part sizes, and can also be used for precise positioning and fixed clamping of large holes in thin-walled parts.

[0036] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A fixture for achieving precise positioning based on a small hole on a thin-walled part, characterized in that: The invention comprises a thin-walled part (1), a precise positioning device (2), a fixing clamping device (3), and an auxiliary fixing support device (4); the precise positioning device (2) comprises a support block (21), a threaded needle-type cylinder body (22), a threaded needle-type cylinder piston rod (23), an inner diameter expansion pin (24), and a tapered chuck (25); the support block (21) comprises a support block upper plate (211), a support column (212), and a support block lower plate (213); a stepped hole is provided at the center of the support block upper plate (211), and a thread is provided below the hole; the threaded needle-type cylinder body (22) and the threaded needle-type cylinder piston rod (23) are connected to each other; The threaded needle cylinder piston rod (23) is assembled, the threaded needle cylinder body (22) and the support block upper plate (211) are fastened by threaded connection, and the threaded needle cylinder piston rod (23) reaches the upward limit under the action of the air path, and the small hole on the thin-walled part is aligned with the threaded needle cylinder piston rod (23) and placed, the inner diameter expansion pin (24) is provided with a stepped hole, and the large inner diameter is set to be tapered and expanded outward, and it is placed in the small hole of the thin-walled part, and the center of the tapered chuck (25) is provided with a threaded hole, and it is fixedly connected to the threaded needle cylinder piston rod (23) by thread; The fixing clamping device (3) comprises a clamping cylinder body (31), a clamping cylinder piston rod (32), and a pressure head (33); The auxiliary fixing support device (4) includes a double-axis cylinder body (41), a double-axis cylinder piston rod (42), a rodless cylinder guide rail (43), a rodless cylinder body (44), a rodless cylinder base (45), a small cylinder body (46), and a small cylinder piston rod (47). The rodless cylinder base (45) includes a side plate (451), a steel wheel shaft (452), a steel wheel (453), and a bottom plate (454). Holes are provided in the center of the side surface of the side plate (451) and the side surface of the bottom plate (454). The steel wheel shaft (452) can be inserted into the two holes. The steel wheel shaft (452) and the steel wheel (453) are used in conjunction with each other. The bottom surface of the rodless cylinder guide rail (43) is connected to the top surface of the rodless cylinder base (45), and the bottom surface of the small cylinder body (46) is connected to the top surface of the rodless cylinder body (44).

2. A fixture for achieving precise positioning based on a small hole on a thin-walled part according to claim 1, characterized in that: The support block (21) comprises a support block upper plate (211), a support column (212), and a support block lower plate (213). A stepped hole is provided at the center of the support block upper plate (211). From top to bottom: the first stepped hole is provided with an inner diameter expansion pin (24), the second stepped hole is provided with a threaded needle-type cylinder piston rod (23), and the end of the third stepped hole is provided with a thread. The aperture of the second stepped hole is smaller than the aperture of the first stepped hole and the aperture of the third stepped hole. There are four supports (212) connecting the support block upper plate (211) and the support block lower plate (213).

3. The fixture for achieving precise positioning based on a small hole on a thin-walled part according to claim 1, characterized in that: The inner diameter expansion pin (24) is provided with a stepped hole, the first section of the stepped hole is a tapered hole expanding outward, the second section of the stepped hole is a straight hole, and a threaded needle-type cylinder piston rod (23) can pass through the second section of the stepped hole. The aperture of the second section of the stepped hole is smaller than the minimum aperture of the first section of the stepped hole. An annular cutting is adopted at the periphery of the boundary between the first section of the stepped hole and the second section of the stepped hole of the inner diameter expansion pin (24) to remove part of the material, and then a hole is drilled radially. A cross-shaped cutting is adopted along the axial direction to reduce the rigidity of the upper part of the inner diameter expansion pin (24). A threaded hole is provided at the center of the tapered chuck (25). The maximum outer diameter is equal to the maximum outer diameter of the first step hole of the inner diameter expansion pin (24), and the minimum outer diameter is less than or equal to the minimum inner diameter of the first step hole of the inner diameter expansion pin (24) and is larger than the aperture of the second step hole of the inner diameter expansion pin (24). The length of the tapered chuck (25) is less than the length of the first section of the stepped hole of the inner diameter expansion pin (24).

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