A fixture for ensuring the symmetry of thin-walled profile parts

Abstract

This utility model discloses a fixture for ensuring the symmetry of thin-walled profile parts. The fixture includes: a fixture body with two symmetrically distributed bosses inside for positioning reference grooves of the parts; a core inserted into the parts for supporting the thin-walled structure; and multiple fastening screws distributed on both sides of the fixture body for fixing the parts to the fixture body; the upper surfaces of the two symmetrically distributed bosses are on the same plane. This device ensures that the parts are not easily deformed during clamping; the core support and the fixture body reduce the deformation of the thin-walled profile parts to over 80%; the two symmetrically distributed bosses on the fixture body, with their upper surfaces on the same plane, increase the symmetry qualification rate of the upper reference surfaces of the two reference grooves of the parts from 62% to 98%.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and more specifically, to a fixture for ensuring the symmetry of thin-walled profile parts. Background Technology

[0002] For thin-walled profile parts (such as aluminum alloy 6061), the local wall thickness is 2mm. The upper and lower surfaces need to be symmetrically machined to ensure that the symmetry of the reference grooves at both ends of the part is 0.1mm. The tolerance seems large, but it is actually difficult to guarantee.

[0003] The main reasons are as follows: 1. The part is a profile part, the dimensions of the reference grooves at both ends of the part are inconsistent, and the machining allowance on the upper and lower surfaces of the part is uneven; 2. The part is a thin-walled part that is prone to deformation; 3. The clamping and machining methods are incorrect.

[0004] Using traditional flat-jaw pliers to directly clamp parts and symmetrically process the upper and lower surfaces of the parts requires repeated measurement, padding with copper sheets, and connecting dimensions to ensure the symmetry requirements of the parts. This process is inefficient, the clamping force is difficult to control, and it is easy to cause the parts to be out of tolerance. Utility Model Content

[0005] This utility model provides a fixture for ensuring the symmetry of thin-walled profile parts, in order to solve the problem in the prior art that using traditional flat-jaw pliers to clamp thin-walled parts is prone to deformation and it is difficult to ensure the symmetry of the upper and lower surfaces and the reference grooves on both sides of the parts.

[0006] To achieve the above objectives, this utility model provides a fixture for ensuring the symmetry of thin-walled profile parts. The fixture includes: a fixture body with two symmetrically distributed bosses inside for positioning reference grooves of the parts; a core inserted into the parts for supporting the thin-walled structure of the parts; and multiple fastening screws distributed on both sides of the fixture body for fixing the parts to the fixture body; the upper surfaces of the two symmetrically distributed bosses are on the same plane.

[0007] Optionally, the fixture body has a U-shaped structure, including: a first side plate, a horizontal plate, and a second side plate; the first side plate, the horizontal plate, and the second side plate are connected in sequence to form a U-shaped structure; bosses are respectively provided on the opposite surfaces of the first side plate and the second side plate; the two bosses are symmetrically distributed.

[0008] Optionally, the fastening screw is used to securely connect the clamp body to the part by passing through the boss of the clamp body.

[0009] Optionally, the clamping force of the fastening screw is in the range of 5-10 N·m, and the head of the fastening screw is provided with an elastic washer.

[0010] Optionally, the core is a rigid support structure made of hard alloy with chrome plating.

[0011] Optionally, the height tolerance of the two bosses of the fixture body is ±0.01mm, and the parallelism of the two bosses is ≤0.02mm.

[0012] Optionally, it also includes: a measuring device; the measuring device includes: a vernier caliper, a lever dial indicator, and a height gauge, used to detect the machining allowance of the upper and lower surfaces of the part, and to detect the symmetry deviation of the upper reference surface of the two reference grooves after the part is machined.

[0013] On the other hand, this utility model provides a processing method using any of the above-mentioned fixtures. The method includes the following steps: S1, inserting the core into the part; inserting the part with the core inserted into the fixture body so that the reference groove of the part matches the boss of the fixture body, and pressing the upper reference surface of the reference groove of the part flat with the upper surface of the boss of the fixture body; S2, fixing the part to the fixture body with fastening screws; S3, processing the upper surface of the part and measuring it with a measuring device, leaving a 0.1mm allowance; S4, flipping the part and repeatedly clamping it with the fixture, processing the lower surface of the part, and measuring it with a measuring device, leaving a 0.1mm allowance; S5, using a measuring device to measure the height of the upper reference surface of the two reference grooves of the part after processing. If the difference between the two height values ​​is ≤0.1mm, the part is qualified.

[0014] The beneficial effects of this utility model are:

[0015] This utility model provides a fixture for ensuring the symmetry of thin-walled profile parts. The fixture includes: a fixture body with two symmetrically distributed bosses inside for positioning reference grooves of the parts; a core inserted into the parts for supporting the thin-walled structure of the parts; and multiple fastening screws distributed on both sides of the fixture body for fixing the parts to the fixture body; the upper surfaces of the two symmetrically distributed bosses are on the same plane. This device ensures that the parts are not easily deformed during clamping. The core support and the fixture body reduce the deformation of the thin-walled profile parts to more than 80%. The two symmetrically distributed bosses on the fixture body, with their upper surfaces on the same plane, increase the symmetry qualification rate of the upper reference surfaces of the two reference grooves of the parts from 62% to 98%. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the fixture for ensuring the symmetry of thin-walled profile parts provided in this embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the clamp body provided in this embodiment of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure for measuring thin-walled profile parts using a measuring device, provided in an embodiment of this utility model.

[0019] Figure 4 This is a flowchart of a processing method provided by an embodiment of the present utility model.

[0020] Symbol explanation:

[0021] Fixture body-1, core-2, fastening screw-3, part-4, boss-5, reference groove-6, vernier caliper-7, lever dial indicator-8, height gauge-9. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] Figure 1 This is a schematic diagram of the fixture for ensuring the symmetry of thin-walled profile parts according to an embodiment of this utility model; as shown. Figure 1 As shown, the fixture includes:

[0024] 1. The fixture body 1 has two symmetrically distributed bosses 5 inside, which are used to position the reference grooves 6 of the part 4.

[0025] Figure 2 This is a schematic diagram of the structure of the clamp body 1 provided in this embodiment of the utility model; as shown Figure 2 As shown,

[0026] The fixture body 1 has a U-shaped structure, including a first side plate, a horizontal plate, and a second side plate. The first side plate, the horizontal plate, and the second side plate are connected in sequence to form a U-shaped structure. Bosses 5 are respectively provided on the opposite surfaces of the first side plate and the second side plate. The two bosses 5 are symmetrically distributed.

[0027] Specifically, two symmetrically distributed 7.8mm bosses 5 are machined on the fixture body 1. The height tolerance of the two bosses 5 on the fixture body 1 is ±0.01mm, and the parallelism of the two bosses 5 is ≤0.02mm, which are used to accurately match the reference groove 6 of the part 4.

[0028] In one optional embodiment, the bottom of the fixture body 1 is provided with two locating pins, which cooperate with the locating holes of the machining platform to achieve rapid alignment. The fixture body 1 is made of hardened steel (hardness HRC50-55), and the surface is ground to Ra≤0.8μm to ensure that it will not deform during long-term use.

[0029] 2. Core 2, inserted into part 4, is used to support the thin-walled structure of part 4;

[0030] The core 2 is a key component used to insert into the interior of part 4 and support its thin-walled structure. Its structure must meet sufficient rigidity and dimensional accuracy requirements. In this embodiment, the core 2 adopts a rigid support structure, is made of hard alloy, and is chrome-plated to improve wear resistance. The shape, size, and installation position of the core 2 are designed according to the stress characteristics of the internal cavity and thin-walled portion of part 4, ensuring that it can fully support part 4 during clamping and preventing deformation due to insufficient flexibility.

[0031] In practical implementation, the core 2 is usually designed as a detachable structure, facilitating interchangeability between parts 4 of different sizes or shapes. The mating surfaces of the core 2 and the inside of the part 4 are precision machined to ensure good positioning and fit during insertion. During installation, the core 2 can be firmly embedded inside the part 4 through appropriate positioning pins and guide grooves, achieving the expected support effect.

[0032] 3. Fastening screws 3, multiple of which are provided and distributed on both sides of the fixture body 1, are used to fix the part 4 to the fixture body 1.

[0033] The fastening screws 3 are used to pass through the boss 5 of the clamp body 1 to fix the clamp body 1 to the part 4. In an optional embodiment, four fastening screws 3 are provided, and the four fastening screws 3 are distributed on both sides of the clamp body 1.

[0034] The clamping force of the fastening screw 3 is in the range of 5-10 N·m, and the head of the fastening screw 3 is provided with an elastic washer to prevent excessive pressure from causing deformation of the part 4.

[0035] In practical use, the fastening screws 3 should be evenly distributed on both sides of the fixture body 1, corresponding to the stress points of the part 4. During operation, the technician first positions the part 4 on the fixture body 1, and then tightens the screws 3 one by one until all screws reach the set clamping force. To ensure that the torque of the screws is consistent during the clamping process, a torque wrench can be used for measurement and adjustment. This step ensures that the part 4 is fixed stably in the fixture, avoiding gaps or offsets between the reference surface of the part 4 and the positioning boss 5 caused by uneven local clamping.

[0036] The upper surfaces of the two symmetrically distributed bosses 5 are on the same plane.

[0037] The upper surfaces of the two symmetrically distributed bosses 5 are on the same plane, which means that the upper surfaces of the two bosses 5 inside the fixture body 1 are precisely machined to achieve absolute coplanarity, ensuring that the reference groove 6 of part 4 fits tightly with the upper surface of the bosses 5 during the clamping process of part 4, thereby achieving the symmetry of the upper reference surface of the reference groove 6 of part 4.

[0038] To achieve precise coplanarity of the upper surfaces of the two bosses 5, high-precision CNC milling machines are typically used during manufacturing. Before machining, the fixture body 1 is fixed on a precision plane reference and positioned using a special fixture to ensure accurate orientation and positioning of the part 4 during machining. After machining, the upper surfaces of the bosses 5 are inspected using a coordinate measuring machine (CMM) or a high-precision level. The height error of the upper surfaces of the two bosses 5 must be controlled within ±0.01mm, and their parallelism should be ≤0.02mm. This strict tolerance control ensures that the surfaces of the bosses 5 can form an ideal planar contact surface in actual use.

[0039] The upper surface of the boss 5 serves as the positioning datum for the fixture, and its precise coplanarity is crucial to ensuring accurate mating between the reference groove 6 of part 4 and the boss 5 of the fixture body 1. Specifically, when part 4 is clamped, the reference groove 6 (or upper reference surface) of part 4 contacts the upper surface of the boss 5. If the upper surfaces of the two bosses 5 are not coplanar, one side may be tightly fitted while the other side has a gap, causing part 4 to shift during clamping or experience uneven force, thus affecting machining accuracy. By ensuring that the upper surfaces of the two bosses 5 are on the same plane, part 4 can be in a perfectly symmetrical state within the fixture body 1, thereby ensuring that the symmetry of the upper and lower surfaces or the upper reference surface between the two reference grooves 6 meets the design requirements during machining.

[0040] In one optional embodiment, a fixture for ensuring the symmetry of a thin-walled profile part 4 includes: a measuring device;

[0041] Figure 3 This is a schematic diagram of the structure of the thin-walled profile part 4 measured by a measuring device according to an embodiment of this utility model; as shown. Figure 3 As shown, the measuring device includes: a vernier caliper 7, a lever dial indicator 8, and a height gauge 9, used to detect the machining allowance of the upper and lower surfaces of part 4, and to detect the symmetry deviation of the upper reference surface of the two reference grooves 6 after part 4 is machined.

[0042] During the machining process, the allowance on the upper and lower surfaces of the machined part 4 is first measured using a vernier caliper 7 to ensure a machining allowance of 0.1mm. Then, the height of the upper reference surfaces of the two reference grooves 6 on part 4 is measured using a lever dial indicator 8 and a height gauge 9. All measurement data are recorded in real time by a digital display instrument, and the height difference between the two measuring points is calculated by the data processing module. When the height difference is less than or equal to 0.1mm, part 4 is considered to meet the machining requirements. To ensure measurement accuracy, all measuring tools must be calibrated before use and in an environment with stable temperature and humidity.

[0043] Figure 4 This is a flowchart of a processing method provided by an embodiment of the present utility model, such as... Figure 4 As shown, the method includes:

[0044] S1. Insert the core 2 into the part 4; insert the part 4 with the core 2 inserted into the fixture body 1 so that the reference groove 6 of the part 4 matches the boss 5 of the fixture body 1, and press the upper reference surface of the reference groove 6 of the part 4 flat with the upper surface of the boss 5 of the fixture body 1.

[0045] First, the operator pre-processes the thin-walled profile part 4 (e.g., cleaning, dimensional inspection) and initially mates it with the pre-selected core 2. The core 2 is inserted into the part 4 at a preset position, utilizing the pre-set mating holes or guide grooves inside the part 4 for initial positioning. At this point, the part 4 begins to form a contact surface with the core 2, ensuring sufficient support for the internal cavity of the part 4. This step requires technicians to pay attention to the tightness of the fit between the core 2 and the part 4 to avoid affecting subsequent positioning accuracy due to improper insertion.

[0046] The part 4, pre-loaded with the core 2, is inserted into the fixture body 1 according to the positioning requirements. Two symmetrically distributed bosses 5 within the fixture body 1 are used to position the reference groove 6 of the part 4. The operator must align the reference groove 6 of the part 4 with the bosses 5, ensuring that the upper reference surface of the reference groove 6 of the part 4 is tightly fitted with the upper surface of the bosses 5. At this time, the planar accuracy of the bosses 5 ensures the accurate positioning of the part 4 within the fixture body 1, preventing deviations in the machining of the part 4 due to inaccurate positioning. After positioning, the operator uses a pre-tightening method to slightly fix the part 4 to the fixture body 1 for subsequent clamping with the fastening screws 3.

[0047] S2. Secure the part 4 to the fixture body 1 using fastening screws 3;

[0048] After part 4 is clamped in place, it is fixedly connected to the fixture body 1 by fastening screws 3. The operator applies a clamping force of 5-10 N·m to each fastening screw 3 in sequence, and uses a torque wrench to confirm that the torque of each screw is consistent. During the tightening process, the elastic washers on the screw heads can effectively distribute the clamping force, ensuring that the force on each part of part 4 is balanced.

[0049] S3. Machin the upper surface of part 4 and measure it with a measuring device, leaving a 0.1mm allowance;

[0050] After fixing, a high-precision CNC machining equipment is used to machine the upper surface of part 4, ensuring that the tool path is consistent with the positioning of the fixture body 1 during the machining process. This ensures that the machined dimension of the upper surface of part 4 is 29.4mm, with a 0.1mm allowance (specifically, the upper surface of part 4 is measured using a vernier caliper 7 to confirm the 0.1mm allowance). During the machining process, the tight fit between the boss 5 of the fixture body 1 and the reference groove 6 of part 4 ensures that part 4 does not shift or deform during machining.

[0051] S4. Flip over part 4 and repeatedly clamp it with a fixture, process the lower surface of part 4, and measure it with a measuring device, leaving a 0.1mm allowance;

[0052] After machining the upper surface of part 4, remove part 4 from the fixture body 1 and flip it over while keeping the position of part 4 and the support of core 2 unchanged. After flipping, repeat the clamping and fastening process of steps S1 to S3 to fix part 4 in the fixture body 1 again. Then, machine the lower surface of part 4 to a size of 29.4mm with a 0.1mm allowance to ensure that the machined lower surface is consistent with the upper surface in terms of position, parallelism and thickness.

[0053] S5. Use a measuring device to measure the height of the upper reference surface of the two reference grooves 6 after machining part 4. If the difference between the two height values ​​is ≤0.1mm, then part 4 is qualified.

[0054] After machining, the height values ​​of the reference surfaces on the two reference slots 6 of part 4 are checked using a lever dial indicator 8 and a height gauge 9. Operators measure the height at the corresponding positions on the two reference slots 6 of part 4 and record the height data at each measuring point. The difference between the height values ​​of the two reference surfaces is calculated. If the difference does not exceed 0.1 mm, it indicates that the symmetry of part 4 after machining meets the design requirements; if it exceeds 0.1 mm, it is determined that the machining deviation of part 4 is too large, and remapping or adjustment is required. The inspection results also serve as an important basis for quality control, providing data support for subsequent process improvements.

[0055] The beneficial effects of this utility model are:

[0056] High-precision positioning: Two symmetrically distributed positioning bosses 5 are set inside the fixture body 1. Through precision machining and strict dimensional control, it is ensured that the reference groove 6 of part 4 and the upper surface of the bosses 5 of the fixture body 1 always remain in close contact, thereby greatly improving the machining symmetry.

[0057] Equal stress distribution: By supporting the thin-walled structure inside part 4 with core 2 and fixing part 4 with evenly distributed fastening screws 3, the stress distribution of part 4 is balanced during processing, avoiding deformation caused by local stress concentration.

[0058] Machining allowance control: A vernier caliper 7 is used to monitor the machining allowance in real time to ensure that a 0.1mm allowance is always left during the machining process to meet the requirements of high-precision machining;

[0059] Easy to operate: The U-shaped structure design of the fixture body 1 and the symmetrical arrangement of the positioning boss 5 make the clamping and flipping process of part 4 simple and easy, improving the overall processing efficiency and production stability.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A fixture for ensuring the symmetry of thin-walled profile parts, characterized in that, include: The fixture body has two symmetrically distributed bosses inside, which are used as reference slots for positioning parts. A core, inserted inside a part, is used to support the part's thin-walled structure; Multiple fastening screws are provided and distributed on both sides of the fixture body to fix the parts to the fixture body. The upper surfaces of the two symmetrically distributed bosses are on the same plane.

2. The fixture for ensuring the symmetry of thin-walled profile parts according to claim 1, characterized in that: The fixture body has a U-shaped structure, including a first side plate, a horizontal plate, and a second side plate. The first side plate, the horizontal plate, and the second side plate are connected in sequence to form a U-shaped structure. Bosses are provided on the opposite surfaces of the first side plate and the second side plate. The two bosses are symmetrically distributed.

3. The fixture for ensuring the symmetry of thin-walled profile parts according to claim 1, characterized in that: The fastening screw is used to pass through the boss of the clamp body to fix the clamp body to the part.

4. The fixture for ensuring the symmetry of thin-walled profile parts according to claim 1, characterized in that: The clamping force of the fastening screw is in the range of 5-10 N·m, and the head of the fastening screw is provided with an elastic washer.

5. The fixture for ensuring the symmetry of thin-walled profile parts according to claim 1, characterized in that: The core is a rigid support structure made of hard alloy with chrome plating.

6. The fixture for ensuring the symmetry of thin-walled profile parts according to claim 1, characterized in that: The height tolerance of the two bosses on the main body of the clamp is ±0.01mm, and the parallelism of the two bosses is ≤0.02mm.

7. The fixture for ensuring the symmetry of thin-walled profile parts according to claim 1, characterized in that, It also includes: measuring devices; The measuring device includes a vernier caliper, a lever dial indicator, and a height gauge, used to detect the machining allowance on the upper and lower surfaces of the part, and to detect the symmetry deviation of the upper reference surface of the two reference grooves after the part has been machined.

Images