Fully-coated residual stress eliminating annealing device for titanium and titanium alloy arc-shaped profiled bars

Abstract

The utility model belongs to the technical field of non-ferrous metal profile forming, and relates to a full-coating type residual stress eliminating annealing device for titanium and titanium alloy arc-shaped profiles, which comprises a bottom plate and a fixed block assembly which is distributed on the bottom plate and can completely coat the arc-shaped profiles, the fixing block assembly is matched with the fastening assembly to restrain and fix the arc-shaped profiled bar so as to avoid secondary deformation of the arc-shaped profiled bar in the annealing process of eliminating residual stress. When the annealing device is used for eliminating residual stress annealing, the arc-shaped profiled bar, the bottom plate and the fixing block assembly form a coating whole, so that the possibility of secondary deformation of the arc-shaped profiled bar in the residual stress eliminating annealing process is effectively avoided, and a good foundation is laid for a subsequent machining process.

Description

Technical Field

[0001] The utility model belongs to the technical field of non-ferrous metal profile forming, and relates to titanium and titanium alloy extruded arc-shaped special-shaped profiles (such as Y-shaped profiles or T-shaped profiles), zirconium and other non-ferrous metal special-shaped profiles, and in particular to a fully-enclosed annealing device for eliminating residual stress for titanium and titanium alloy arc-shaped special-shaped profiles. Background Art

[0002] As is well known in the industry, titanium alloys, which emerged in the 1950s, are a crucial structural metal. With their high strength, excellent corrosion resistance, and outstanding high-temperature performance, titanium alloys play a pivotal role in the aerospace industry, primarily used in aircraft engine components, aircraft structures, and various pressure vessels for spacecraft.

[0003] However, due to the high strength and high springback characteristics of titanium alloys, large residual stresses are generated within the titanium alloy material after large deformation. If the residual stress within the material is not properly and completely released, it will lead to unstable component dimensions, slow deformation, cracks, and even delamination and fatigue fracture of the component. If measures are not taken to release the residual stress in this situation, even if subsequent machining processes can be carried out, deformation will inevitably occur after processing.

[0004] Although titanium alloy profiles can meet the arc requirements before the machining process after large deformation, in order to ensure the stability of product quality, a sufficient residual stress elimination process must be carried out. Currently, the methods for eliminating residual stress mainly include heat treatment, mechanical method, vibration treatment and other specific methods. Among them, heat treatment is one of the most commonly used methods to eliminate residual stress. Its principle is to use the thermal expansion and contraction of the material during the heating and cooling process to promote the redistribution of internal residual stress. Common heat treatment methods include annealing, normalizing, and quenching. For large structural parts, annealing can effectively eliminate residual stress and improve the stability and service life of the material.

[0005] Titanium alloy extruded profiles are large structural parts. During the residual stress relief annealing process, if unconstrained residual stress relief annealing is used, the parts will undergo secondary deformation due to the release of residual stress, leading to the following three problems: First, the curvature radius of the curved profile will be inconsistent in some areas; second, local distortion will occur in multiple locations on each surface of the curved profile; and third, the flatness of each surface and the overall curved profile will be out of tolerance. Utility Model Content

[0006] The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art and provide a fully covered annealing device for eliminating residual stress for arc-shaped special-shaped materials of titanium and titanium alloys, so as to solve the problem of secondary deformation of arc-shaped special-shaped materials during the annealing process of eliminating residual stress.

[0007] This fully enclosed annealing device for eliminating residual stress for arc-shaped special-shaped materials of titanium and titanium alloys includes: a base plate and a fixing block assembly distributed on the base plate and capable of completely covering the arc-shaped special-shaped materials. The fixing block assembly, in cooperation with the fastening component, realizes the restraint and fixation of the arc-shaped special-shaped materials to avoid secondary deformation of the arc-shaped special-shaped materials during the residual stress elimination annealing process.

[0008] Specifically, the fastening assembly includes: a first fastening assembly for fixing the fixing block assembly horizontally and a second fastening assembly for fixing the fixing block assembly vertically.

[0009] Specifically, the first fastening component includes a plurality of adjusting screws distributed along the outer side of the fixing block assembly, and the fixing block assembly is completely fitted with the profile of the arc-shaped special-shaped material by adjusting the adjusting screws.

[0010] Specifically, the second fastening assembly includes stud bolts symmetrically distributed on both sides of the fixing block assembly, and pressure plates are further provided on the oppositely arranged stud bolts, which cooperate with locking nuts to realize vertical fixation of the fixing block assembly.

[0011] Preferably, the number of the stud bolts is multiple groups, and each group of stud bolts can cooperate with the vertical pressure block to achieve local tightening; and the nuts and adjustment screws all adopt an anti-loosening function, which can provide a stable locking force, while ensuring the stability of the locking force, it is also beneficial to improve the reliability of the full coverage constraint.

[0012] Specifically, the fixed block assembly includes:

[0013] An arc-shaped fixing block is provided on the bottom plate, and is used to fill the first profile of the arc-shaped special-shaped material;

[0014] Horizontal push blocks distributed on the bottom plate, used to support the second profile of the arc-shaped special-shaped material;

[0015] A vertical pressing block located on the third profile of the arc-shaped profile;

[0016] The arc-shaped special-shaped material is completely covered by the filling of the arc-shaped fixing block, the pushing of the horizontal pushing block and the pressing of the vertical pressing block.

[0017] Specifically, the curvature radius of the arc-shaped fixing block is the same as the curvature radius of the arc-shaped special-shaped bar.

[0018] Specifically, the number of the arc-shaped fixing blocks can be one or more, and the number of the horizontal push blocks and vertical pressure blocks can both be multiple. In actual operation, the number of the horizontal push blocks and vertical pressure blocks can be adaptively adjusted according to the size of the arc-shaped profile. To meet the requirements of subsequent annealing, the horizontal push blocks and vertical pressure blocks should be closely arranged and, in conjunction with the arc-shaped fixing blocks, achieve complete coverage of the arc-shaped profile.

[0019] Preferably, multiple sections of vertical pressing blocks are used, any one of which can achieve local compression of the arc-shaped special-shaped material, solving the problem of poor local flatness of the profile; three sections of horizontal pushing blocks are used, any one of which can solve the problem of excessive local curvature of the arc-shaped special-shaped material.

[0020] Specifically, the materials of the arc-shaped fixing block, horizontal push block, and vertical pressure block all use materials with the same or similar thermal expansion coefficient as the titanium alloy material. The expansion properties of these materials in the hot state tend to be consistent, which effectively ensures that the arc-shaped special-shaped material will not deform again in the locked state.

[0021] Specifically, the bottom plate is made of a large-area steel plate with a thickness of 40 mm to 50 mm.

[0022] Specifically, the arc-shaped special-shaped bar is an arc-shaped Y-shaped bar or an arc-shaped T-shaped bar.

[0023] Compared with the existing technology, the technical solution provided by the utility model has the following beneficial effects:

[0024] When using this annealing device to eliminate residual stress during annealing, the fixing block assembly, in cooperation with the fastening component, can achieve the constraint and fixation of the curved profile, that is, the curved profile, the base plate, and the fixing block assembly form a covering whole, effectively avoiding the possibility of secondary deformation of the curved profile during the residual stress elimination annealing process, and laying a good foundation for subsequent machining processes. Specifically:

[0025] The utility model adopts multiple stud bolts and nuts, multiple pressure plates, and multiple sections of vertical pressure blocks to restrain the arc-shaped special-shaped materials, which can effectively avoid secondary deformation of the arc-shaped special-shaped materials in the vertical direction; and, by adopting multiple adjustment screws, in conjunction with horizontal push blocks and arc-shaped fixing blocks, the secondary deformation of the arc-shaped special-shaped materials in the horizontal direction is restrained. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are incorporated into and constitute a part of this specification and, together with the description, are used to explain the principles of the present invention.

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 This is the front view of the arc-shaped profile provided by the utility model;

[0029] Figure 2 This is a structural diagram of a fully enclosed annealing device for eliminating residual stress for titanium and titanium alloy arc-shaped special-shaped materials provided by the utility model;

[0030] Figure 3 A cross-sectional view of a curved Y-profile provided in an embodiment;

[0031] Figure 4 This is a structural diagram of a fully enclosed annealing device for eliminating residual stress for titanium and titanium alloy arc-shaped Y-profiles provided in an embodiment.

[0032] Among them: 1. Base plate; 2. Arc-shaped special-shaped material; 2-1. First profile; 2-2. Second profile; 2-3. Third profile; 3. Fixed block assembly; 3-1. Arc-shaped fixed block; 3-2. Horizontal push block; 3-3. Vertical pressure block; 4. Fastening assembly; 4-1. Adjusting top screw; 4-2. Stud bolt; 4-3. Pressure plate; 5. Arc-shaped bar with holes. DETAILED DESCRIPTION

[0033] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible implementations consistent with the present invention. Instead, they are merely examples consistent with certain aspects of the present invention as detailed in the appended claims.

[0034] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0035] Example

[0036] See also Figure 2This embodiment provides a fully enclosed annealing device for eliminating residual stress for arc-shaped special-shaped materials of titanium and titanium alloys, comprising: a base plate 1 and a fixing block assembly 3 distributed on the base plate 1 and capable of completely covering the arc-shaped special-shaped material (arc-shaped Y-shaped material). The fixing block assembly 3, in cooperation with the fastening component 4, realizes the restraint and fixation of the arc-shaped Y-shaped material to avoid secondary deformation of the arc-shaped Y-shaped material during the residual stress elimination annealing process.

[0037] The main view of the curved Y profile is shown in Figure 1 , cross-sectional view see Figure 3 , the fixed block assembly 3 includes:

[0038] An arc-shaped fixing block 3-1 is provided on the bottom plate to fill the first profile 2-1 of the arc-shaped Y-profile, that is, the area between the two wing side surfaces of the arc-shaped Y-profile;

[0039] Horizontal push blocks 3-2 distributed on the bottom plate 1, used to support the second profile 2-2 of the arc-shaped Y-profile;

[0040] A vertical pressing block 3-3 located on the third profile 2-3 of the arc-shaped Y-profile;

[0041] The arc-shaped Y-profile is completely covered by the filling of the arc-shaped fixing block 3-1, the pushing of the horizontal pushing block 3-2 and the pressing of the vertical pressing block 3-3.

[0042] In this embodiment, in order to completely cover the curved Y-profile, a set of fixed block assemblies 3 (enclosing bodies) are designed that can completely fit with the various profiles of the curved Y-profile, and the curved Y-profile is tightly constrained within the enclosing body. In order to make the curved Y-profile fit tightly with the inner and outer arc surfaces of the enclosing body, stud bolts 4-2, pressure plates 4-3, multi-section vertical pressure blocks 3-3 and adjustment screws 4-1, horizontal push blocks 3-2 and curved fixed blocks 3-1 are designed. The curved Y-profile is pressed against the various inner surfaces of the enclosing body through the vertical stud bolts 4-2, pressure plates 4-3 and horizontal adjustment screws 4-1. Figure 4 .

[0043] Specifically, the arc-shaped fixing block 3-1 can use a whole arc-shaped fixing block as the reference arc body, or it can use high-strength hexagon socket bolts to fix multiple arc-shaped fixing blocks to form a reference arc body, and the curvature radius of the reference arc body is the same as the curvature radius of the arc Y profile.

[0044] Preferably, the bottom plate 1 is made of a large-area steel plate with a thickness of 40 mm to 50 mm, which can completely cover and restrain the arc-shaped Y-profile with the cooperation of the above-mentioned fixing block assembly 3 and the fastening component 4.

[0045] Preferably, the materials of the arc-shaped fixing block 3-1, the horizontal push block 3-2, and the vertical pressure block 3-3 are all selected to have the same or close thermal expansion coefficient as the titanium alloy, so that their expansion properties tend to be consistent in the hot state, which can avoid the problem of further deformation in the locked state.

[0046] Furthermore, the fastening assembly 4 in this embodiment includes a first fastening assembly for fixing the fixing block assembly 3 horizontally and a second fastening assembly for fixing the fixing block assembly 3 vertically.

[0047] Preferably, the first fastening component includes a plurality of adjustment screws 4-1 distributed along the outer side of the fixing block assembly 3, and the fixing block assembly 3 is made to completely fit the surface of the arc-shaped special-shaped material 2 by adjusting the adjustment screws 4-1; the second fastening component includes stud bolts 4-2 symmetrically distributed on both sides of the fixing block assembly 3, and a pressure plate 4-3 is also provided on the oppositely arranged stud bolts 4-2, and then cooperated with the locking nut to realize the vertical fixation of the fixing block assembly 3.

[0048] The assembly and use process of the annealing device in this embodiment are as follows:

[0049] 1) Assembly process:

[0050] First, multiple arc-shaped fixing blocks 3-1 are fixed to a large steel plate (i.e., base plate 1) with a thickness of 40 mm to 50 mm using high-strength hexagon socket bolts to form a reference arc. The curvature radius of the reference arc is the same as that of the arc-shaped Y-shaped profile.

[0051] Next, the perforated arc strip 5 is placed on a large steel plate with a thickness of 40 mm to 50 mm, located on the inner arc side of the reference arc body. The perforated arc strip 5 is moved so that each hole provided on the arc strip 5 coincides with an internal threaded hole located on the large steel plate and near the inner arc side of the reference arc body (arc-shaped fixing block 3-1).

[0052] Then, one end of the stud bolts 4-2 is screwed one by one into the internal threaded holes on the large steel plate near the inner arc side of the reference arc body to form a first group of stud bolts; then, one end of the stud bolts 4-2 is screwed one by one into the internal threaded holes on the large steel plate near the outer arc side of the reference arc body to form a second group of stud bolts. The first group of stud bolts and the second group of stud bolts are symmetrically distributed on both sides of the reference arc body;

[0053] Next, place the horizontal push block 3-2 and the vertical pressure block 3-3; the horizontal push block 3-2 is placed in the gap between the arc-shaped fixed block 3-1 and the arc-shaped bar 5 with holes;

[0054] Finally, the fixing block assembly 3 is locked and fixed by using the pressing plate 4 - 3 and the locking nut in conjunction with the adjusting screw 4 - 1 .

[0055] 2) Usage process:

[0056] Step 1: Remove all locking nuts, pressure plate 4-3 and vertical pressure block 3-3, loosen all adjustment screws 4-1 and move the horizontal push block 3-2 back to the appropriate position;

[0057] Step 2: Place the arc-shaped Y-shaped profile to be annealed and place it close to the corresponding surface of the arc-shaped fixing block 3-1, that is, the inner arc side surface of the arc-shaped fixing block 3-1 is in contact with the first profile 2-1 of the arc-shaped Y-shaped profile;

[0058] Step 3: Manually push each of the horizontal push blocks 3-2 to make it close to the second profile 2-2 of the arc-shaped Y-profile, then place the vertical pressing block 3-3 on the third profile 2-3 of the arc-shaped Y-profile, and then use each pressing plate 4-3 to pass through the locking stud 4-2 and fall on the vertical pressing block 3-3;

[0059] Step 4: First, tighten the adjustment screws 4-1 one by one from the starting end to the end, and then tighten each adjustment screw 4-1 in sequence and repeatedly (using a torque wrench) until the inner arc surface of the horizontal push block 3-2 is nearly flush with the inner arc surface of the vertical pressure block 3-3;

[0060] Step 5: Use a torque wrench to tighten the locking nuts above each vertical pressing block 3-3 one by one, so that the vertical pressing block 3-3 is in close contact with the third profile 2-3 of the arc-shaped Y-profile, and the horizontal push block 3-2 is in close contact with the second profile 2-2 of the arc-shaped Y-profile. It should be noted that after the arc-shaped Y-profile is covered, a gap is left at each end of the arc-shaped Y-profile along the extension direction to ensure that each end direction of the arc-shaped Y-profile is in a free state to release internal stress.

[0061] Step 6: Place the annealing device coated with the arc-shaped Y-profile into a resistance heating furnace for annealing;

[0062] Step 7: After the heat preservation is completed, the furnace is cooled to room temperature and then taken out of the furnace. The annealing device covered with the curved Y profile is hoisted out as a whole, and the curved Y profile is taken out according to the reverse steps of loading the curved Y profile into the annealing device.

[0063] In this embodiment, to completely enclose the curved Y-profile, a set of fixed block assemblies 3 (enclosing bodies) are designed to completely conform to the various profiles of the curved Y-profile, tightly confining the curved Y-profile within the enclosing bodies. To ensure that the curved Y-profile closely conforms to the inner and outer arc surfaces of the enclosing bodies, stud bolts 4-2, a pressure plate 4-3, a multi-section vertical pressure block 3-3, an adjustment screw 4-1, a horizontal push block 3-2, and a curved fixed block 3-1 are designed. The curved Y-profile is pressed against the various inner surfaces of the enclosing bodies via the vertical stud bolts 4-2, the pressure plate 4-3, and the horizontal adjustment screw 4-1.

[0064] In addition, during the annealing process of this embodiment, the heating temperature process for eliminating residual stress is as follows: stepwise heating from room temperature to approximately 600°C, at a heating rate of 5°C / min, and holding for 2-4 hours. After annealing, the flatness (unit: mm), radius deviation (unit: mm), and torsion angle (unit: °) of the curved Y-shaped profile before (before) and after (after) residual stress elimination are compared as shown in Table 1 below:

[0065] Table 1 Comparative data of flatness, radius deviation and torsion angle of arc Y profile before and after shaping

[0066] Position marks on profiles 1 2 3 4 5 6 Flatness before shaping 3.22 3.38 3.12 3.32 3.14 3.04 Flatness after shaping 1.86 1.86 1.90 1.88 1.88 1.86 Radius deviation before shaping 4.00 3.06 2.56 2.36 3.22 3.36 Radius deviation after shaping 2.30 2.32 2.28 2.26 2.24 2.26 Profile torsion angle before shaping 2.52 2.16 2.06 2.26 1.76 2.66 Profile torsion angle after shaping 1.52 1.56 1.56 1.60 1.50 1.54

[0067] As can be seen from Table 1 above, the annealing device provided in this embodiment has significantly improved the flatness, radius deviation, and torsion angle before and after forming, and the deviations of the flatness, radius deviation, and torsion angle at different positions after forming are maintained within a relatively stable range.

[0068] The above description is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0069] It should be understood that the present invention is not limited to the above description and that various modifications and changes can be made without departing from the scope of the present invention. The scope of the present invention is limited only by the appended claims.

Claims

1. A fully covered annealing device for eliminating residual stress for titanium and titanium alloy arc-shaped special-shaped materials, characterized in that: include: A base plate (1) and a fixing block assembly (3) distributed on the base plate (1) and capable of completely covering an arc-shaped special-shaped material (2); the fixing block assembly (3) realizes the restraint and fixation of the arc-shaped special-shaped material (2) in cooperation with a fastening component (4), so as to prevent the arc-shaped special-shaped material (2) from secondary deformation during the residual stress elimination annealing process.

2. The fully enclosed annealing device for eliminating residual stress for titanium and titanium alloy arc-shaped special-shaped materials according to claim 1, characterized in that: The fastening assembly (4) comprises: a first fastening assembly for fixing the fixing block assembly (3) horizontally, and a second fastening assembly for fixing the fixing block assembly (3) vertically.

3. The fully enclosed annealing device for eliminating residual stress for titanium and titanium alloy arc-shaped special-shaped materials according to claim 2, characterized in that: The first fastening assembly comprises a plurality of adjusting screws (4-1) distributed along the outside of the fixing block assembly (3); the adjusting screws (4-1) are adjusted to allow the fixing block assembly (3) to completely fit the profile of the arc-shaped special-shaped material (2).

4. The fully enclosed annealing device for eliminating residual stress for titanium and titanium alloy arc-shaped special-shaped materials according to claim 2, characterized in that: The second fastening assembly comprises stud bolts (4-2) symmetrically distributed on both sides of the fixing block assembly (3), and pressure plates (4-3) are further provided on the stud bolts (4-2) arranged opposite to each other, and are combined with locking nuts to achieve vertical fixation of the fixing block assembly (3).

5. The fully enclosed annealing device for eliminating residual stress for titanium and titanium alloy arc-shaped special-shaped materials according to claim 1, characterized in that: The fixed block assembly (3) comprises: An arc-shaped fixing block (3-1) is arranged on the bottom plate (1) and is used to fill the first profile (2-1) of the arc-shaped special-shaped material; Horizontal push blocks (3-2) distributed on the bottom plate (1) are used to support the second profile (2-2) of the arc-shaped special-shaped material; a vertical pressing block (3-3) located on the third profile (2-3) of the arc-shaped special-shaped material; The arc-shaped special-shaped material is completely covered by the filling of the arc-shaped fixing block (3-1), the pushing of the horizontal pushing block (3-2) and the pressing of the vertical pressing block (3-3).

6. The fully enclosed annealing device for eliminating residual stress for titanium and titanium alloy arc-shaped special-shaped materials according to claim 5, characterized in that: The curvature radius of the arc-shaped fixing block (3-1) is the same as the curvature radius of the arc-shaped special-shaped material.

7. The fully enclosed annealing device for eliminating residual stress for titanium and titanium alloy arc-shaped special-shaped materials according to claim 5, characterized in that: The number of the arc-shaped fixing block (3-1) is at least one, and the number of the horizontal pushing block (3-2) and the vertical pressing block (3-3) are both multiple.

8. The fully enclosed annealing device for eliminating residual stress for titanium and titanium alloy arc-shaped special-shaped materials according to claim 5, characterized in that: The thermal expansion coefficients of the materials used for the arc-shaped fixing block (3-1), the horizontal push block (3-2), and the vertical pressing block (3-3) are all the same as the thermal expansion coefficient of the titanium alloy material.

9. The fully enclosed annealing device for eliminating residual stress for titanium and titanium alloy arc-shaped special-shaped materials according to any one of claims 1 to 8, characterized in that: The bottom plate (1) is made of a steel plate with a thickness of 40 mm to 50 mm.

10. The fully enclosed annealing device for eliminating residual stress for titanium and titanium alloy arc-shaped special-shaped materials according to any one of claims 1 to 8, characterized in that: The arc-shaped special-shaped bar (2) is an arc-shaped Y-shaped bar or an arc-shaped T-shaped bar.

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