CN108526964B - Prevent reprocessing to obtain continuous turning titanium alloy surface inspection sample fixture and method - Google Patents

Abstract

The invention discloses a fixture and a method for preventing reprocessing to obtain a continuous turning titanium alloy surface detection sample, comprising a central shaft, a mounting plate, a positioning baffle plate and a locking nut. The mounting plate is a circular thin plate, and the A fracture groove matching the workpiece is formed on the outer circumferential direction of the thin plate, the bottom surface of the fracture groove forms a right angle with the bottom of the side surface, and the side surface of the fracture groove is provided with a positioning portion that protrudes into the fracture groove; the circular thin plate and the center The shafts are connected by keys; the two sides of the mounting plate are provided with positioning baffles installed on the central shaft, and the mounting plate and the positioning baffles are locked by locking nuts.

Description

Prevent reprocessing to obtain continuous turning titanium alloy surface inspection sample fixture and method

technical field

The invention relates to a cutting jig and an experimental method, in particular to a jig and a method for preventing reprocessing to obtain a continuous turning titanium alloy surface detection sample.

Background technique

Titanium alloy is a new type of structural metal with strategic significance developed by the country in the 21st century, and has been widely used in the fields of aerospace and national defense high-tech weapons and equipment. Many researchers focus on the turning of titanium alloys and the surface quality after machining. After the corresponding turning of the titanium alloy, it is necessary to obtain a sample with a smaller size suitable for testing from the corresponding workpiece by reprocessing such as wire cutting technology. Since titanium alloys are prone to oxidation under high temperature conditions, if they undergo reprocessing technology, the cutting heat generated will affect the original machined surface, resulting in an oxide film on the machined surface, especially the common bluing phenomenon. This results in a discrepancy between the observed surface of the specimen and the actual turned surface. If the titanium alloy is firstly divided into the size of the test sample for intermittent machining through the relevant technology, the cutting heat and cutting force generated during the cutting process are discontinuous, and the obtained machined surface is different from the actual surface obtained by continuous turning machining. big difference. The reasons for the above analysis will directly affect the reliability of subsequent detection of experimental samples and data analysis.

SUMMARY OF THE INVENTION

In view of the deficiencies in the prior art, the present invention provides a new idea for obtaining surface detection samples and related experimental methods after continuous turning of titanium alloys by designing relevant cutting fixtures and experimental methods, and improves the research on the surface quality of cutting processing. It affects the accuracy of related experiments and tests; the fixture can improve the accuracy of test samples and can be reused.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

A fixture for preventing reprocessing to obtain continuous turning titanium alloy surface detection sample fixture, comprising a central axis, a mounting plate, a positioning baffle and a locking nut, the mounting plate is a circular thin plate, and the outer circumferential direction of the circular thin plate is A fracture groove matching the workpiece is formed on it, the bottom surface of the fracture groove forms a right angle with the bottom of the side surface, and the side surface of the fracture groove is provided with a positioning portion that protrudes into the fracture groove; the circular thin plate and the central shaft are connected by a key; The two sides of the mounting plate are provided with positioning baffles installed on the central axis, and the mounting plate and the positioning baffles are locked by means of locking nuts.

Further, the workpiece is an annular structure with the same thickness as the mounting plate, and the radius of the thin plate of the workpiece is larger than that of the mounting plate; the inner ring of the workpiece is provided with a raised portion that matches the fracture groove, and the side of the raised portion is provided with a raised portion. There is a clamping groove, which cooperates with the positioning part on the installation plate; the workpiece is just installed on the installation plate, and there is no gap between the two after matching, forming a complete annular structure, the workpiece thin plate The structure design and the mounting plate structure design can complement each other.

Further, the shapes of the mounting plate and the workpiece are completed by wire cutting technology. Both sides of the workpiece sheet must be polished before cutting to remove the influence of wire cutting on both sides of the workpiece.

Further, a limit key is also provided on the central shaft to limit the positioning plate, and the size of the positioning plate is determined by the design of the keyway on the mounting plate sheet, the workpiece sheet and the baffle plate.

Further, the locking nut has self-locking ability, which can fix the assembled clamp, and has the effect of preventing loosening and anti-vibration.

Further, the positioning baffle includes a left positioning baffle and a right positioning baffle, the left positioning baffle and the right positioning baffle are circular, and their size is determined according to the size of the workpiece; the middle part is a hollow circle, with keyway.

Further, the end of the central shaft is provided with a thread, which is matched with the locking nut.

A cutting experiment method that prevents reprocessing and directly obtains continuously turning titanium alloy surface inspection samples:

1. Use wire cutting technology to process the mounting plate and workpiece in advance;

2. Hold the central axis on the three-jaw chuck of the CNC lathe, then install the left positioning baffle, the mounting plate, the workpiece, and the right positioning baffle in sequence, fix them with the limit key and the lock nut, and finally use the The center shaft is fixed by the top of the machine tool;

3. Rough turning the outer circle of the workpiece first, so that the surface to be machined and the central axis of the workpiece are on the same cylindrical surface; continue rough turning, so that the machining surface of the workpiece and the outermost ring of the mounting plate meet the reserved space. Distance; the requirements of this distance are: not only can ensure sufficient removal in the cutting process, but also ensure that the test sample can be obtained smoothly after the cutting experiment is completed;

4. Continue to process the workpiece according to the set cutting experiment parameters; after the cutting experiment is completed, remove the machined workpiece and directly obtain the detection sample of the corresponding machined surface, without the need for secondary auxiliary processing.

The working principle of the present invention is:

A method for preventing reprocessing and directly obtaining a continuously turned titanium alloy surface inspection sample. By designing a special cutting fixture and workpiece structure, after rough turning and processing of experimental parameters in sequence, the required machined surface inspection sample is effectively broken at the designed fracture groove position, and the corresponding machined surface inspection test is directly obtained. Sample. This method not only avoids the influence of the cutting heat and cutting force generated in the secondary machining process on the original turning surface, but also ensures the continuity of the cutting process and ensures the obtained test sample surface and the actual turning surface. Consistency and improve the accuracy of experiments and tests that study the effect of machining on surface quality.

Compared with the prior art, the present invention has the following advantages:

1) Prevent reprocessing to obtain continuous turning titanium alloy surface detection sample fixtures and experimental methods, suitable for ordinary machine tools and CNC machine tools, with strong versatility.

2) Prevent reprocessing to obtain continuous turning titanium alloy surface detection sample fixture, the structure design is simple and convenient, and it can be recycled.

3) The design of the special fracture groove structure of the mounting plate sheet and the workpiece sheet in the fixture structure can obtain multiple machined surface testing samples at one time, avoiding the unevenness of the samples after multiple processing.

4) Prevent reprocessing to obtain continuous turning titanium alloy surface inspection sample fixtures and experimental methods, especially for special materials that cannot be processed twice.

5) Prevent reprocessing to obtain continuous turning titanium alloy surface inspection sample fixtures and experimental methods, ensure the consistency between the obtained inspection sample surface and the actual turning surface, and improve the relevant experiments and experiments to study the effect of cutting on surface quality. Test accuracy.

Description of drawings

The accompanying drawings that form a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application and do not constitute improper limitations on the present application.

1 is a schematic cross-sectional view of the structure of the present invention to prevent reprocessing to obtain a continuous turning titanium alloy surface detection sample fixture;

Fig. 2(1), Fig. 2(2), Fig. 2(3) are the structural schematic diagrams of the special mounting plate thin plate in the fixture of the present invention;

Fig. 3 (1), Fig. 3 (2), Fig. 3 (3) are the structural schematic diagrams of the workpiece sheet in the fixture of the present invention;

Fig. 4 is the structural schematic diagram after the mounting sheet and the workpiece sheet in the fixture of the present invention are matched;

Figure 5 (a) Figure 5 (b), Figure 5 (c) the structural diagram of the processed sample;

Among them, 1-limit key, 2-center shaft, 3-left positioning baffle, 4-workpiece sheet, 5-installation plate sheet, 6-right positioning baffle, 7-washer, 8-lock nut, 9 -Keyway, 10-Hollow circle, 11-Break groove.

Detailed ways

It should be noted that the following detailed description is exemplary and intended to provide further explanation of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that the presence of features, steps, operations, devices, components and/or combinations thereof;

For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, it only means that the directions of up, down, left and right are consistent with the drawings themselves, and do not limit the structure. It is for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention.

Terminology explanation part: The "fracture groove" is a U-shaped groove structure.

As described in the background art, in the prior art, after the corresponding turning of the titanium alloy, it is necessary to obtain a sample with a smaller size suitable for detection from the corresponding workpiece by reprocessing such as wire cutting technology. Since titanium alloys are prone to oxidation under high temperature conditions, if they undergo reprocessing technology, the cutting heat generated will affect the original machined surface, resulting in an oxide film on the machined surface, especially the common bluing phenomenon. This results in a discrepancy between the observed surface of the specimen and the actual turned surface. If the titanium alloy is firstly divided into the size of the test sample for intermittent machining through the relevant technology, the cutting heat and cutting force generated during the cutting process are discontinuous, and the obtained machined surface is different from the actual surface obtained by continuous turning machining. big difference. The reasons for the above analysis will directly affect the reliability of subsequent detection of experimental samples and data analysis. , In order to solve the above technical problems, the present application proposes a new idea for obtaining surface detection samples and related experimental methods after continuous turning of titanium alloys by designing related cutting fixtures and experimental methods, improving research Accuracy of experiments and tests related to the effect of machining on surface quality; the fixture can improve the accuracy of test samples and is reusable.

Example 1

A jig for preventing reprocessing to obtain continuous turning titanium alloy surface inspection specimens. As shown in FIG. 1 , the fixture mainly includes a central shaft 2 , a mounting plate 5 , a workpiece 4 , a left positioning baffle 3 , a right positioning baffle 6 , a limit key 1 , and a locking nut 8 .

Further preferably, the length of the central shaft 2 can be designed to be 200 mm, the diameter of the holding end can be designed to be 50 mm, and the diameter of the mounting end can be designed to be 30 mm.

The left end of the central shaft is provided with a left positioning baffle, and the left positioning baffle is circular; further preferred diameter size is 100 mm, and thickness is 10 mm.

The rightmost end of the center shaft has threads for the locknut and has a center hole.

Further preferably, the material of the central shaft may be 45# steel.

As shown in Figure 2 (1), Figure 2 (2), Figure 2 (3), it is a special circular mounting plate thin plate, the diameter of the mounting plate is larger than the diameter of the two positioning baffles, and its diameter is preferably Designed to be 100mm. The thickness of the mounting plate can be designed to be 2mm. In order to obtain a plurality of machined surface test samples at one time, a plurality of corresponding fracture grooves 11 are arranged on the circumference of the mounting plate, and the outer ring of the thin plate of the mounting plate forms a structure similar to a gear; for the processing after obtaining the test samples For the relevant testing technology required for the surface, the structure of the fracture groove is designed so that the bottom edge is a right angle, and the outer side coincides with the round edge of the circular plate of the mounting plate; further preferably, the side depth is 10mm, the bottom width is 15mm, and the fracture groove The inner side is provided with a convex positioning part.

A hollow circle 10 structure is arranged in the middle part of the mounting plate, and the size is the same as that of the mounting part at the right end of the central shaft; further preferably, the size of the hollow circle is preferably 30mm, and the inner circle is provided with a key groove 9, which is used for The key connection with the central shaft; the material of the circular mounting plate thin plate is die steel H13.

As shown in Figure 3 (1), Figure 3 (2), Figure 3 (3), it is the shape of the workpiece, which is in the shape of an annular thin plate, and its thickness is consistent with the mounting plate; preferably, it can be designed as 2mm. The diameter of the workpiece sheet is larger than the diameter of the mounting plate, and the rough machining thickness of 2mm and the experimental cutting thickness of 1mm are reserved. In addition, there is a continuous layer thickness of 0.5mm, and the diameter is 115mm. The inner circumferential direction of the workpiece sheet is provided with a protrusion that matches the fracture groove of the mounting plate, and the structural design of the protrusion matches the structural design of the mounting plate; The positioning part on the matching.

As shown in Figure 4, the structural design of the workpiece sheet and the structural design of the mounting plate can be complementary, and there is no gap between the two after they are matched, forming a complete circular structure. Further preferably, the material of the circular workpiece sheet is titanium alloy TC4. The way the two work together is similar to the way they mesh with gears.

Both the mounting plate sheet and the workpiece sheet are made by wire cutting technology. Both sides of the workpiece sheet must be polished before cutting to remove the influence of wire cutting on both sides of the workpiece.

The right positioning baffle is also circular, and the diameter and thickness of the right positioning baffle are consistent with the left positioning baffle. Further preferably, the material is 45# steel.

Further preferably, the limit key is an ordinary flat key, the size and length are 20mm, the width is 20mm, and the thickness is 5mm. The material is 45# steel.

Further preferably, the nut is a locking nut, which has self-locking ability and can prevent loosening and anti-vibration.

Example 2

This example uses CNC turning to process the workpiece, which is further preferably completed on a PUMA200M lathe. The material is titanium alloy TC4.

The central axis is supported on the three-jaw chuck of the CNC lathe, and then the thin plate of the mounting plate, the thin plate of the workpiece, and the right positioning baffle are installed in sequence, fixed by the limit key and the lock nut, and finally the central axis is fixed by the top of the machine tool.

The outer circle is roughed first, and the cutting parameters used are the cutting speed of 40m/min and the feed rate of 0.1mm/rev, so that the surface to be machined of the workpiece sheet and the central axis are on the same cylindrical surface. Continue to rough the outer circle, so that the distance between the processing surface of the workpiece sheet and the cylindrical surface of the mounting plate is 1.3mm.

Machining was carried out with cutting experimental parameters, the cutting speed was 120m/min, and the feed rate was 0.1mm/rev. After the cutting experiment is completed, the thickness of the fracture layer of the workpiece thin plate is 0.3mm, which can be easily broken, and the inspection sample of the corresponding machined surface can be directly obtained without secondary auxiliary processing.

A fixture and a cutting experiment method implemented in this example to prevent reprocessing to obtain continuously turning titanium alloy surface detection samples can directly obtain the detection samples of the corresponding machined surfaces. This method not only avoids the influence of the cutting heat and cutting force generated in the secondary machining process on the original turning surface, but also ensures the continuity of the cutting process and ensures the obtained test sample surface and the actual turning surface. Consistency and improve the accuracy of experiments and tests that study the effect of machining on surface quality.

The above descriptions are only preferred examples of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims (8)

1. to prevent reprocessing and obtain continuous turning titanium alloy surface detection sample fixture, it is characterized in that, comprise central axis, mounting plate, positioning baffle plate and locking nut, described mounting plate is a circular thin plate, in the circular A fracture groove matching the workpiece is formed on the outer circumferential direction of the thin plate, the bottom surface of the fracture groove forms a right angle with the bottom of the side surface, and the side surface of the fracture groove is provided with a positioning portion that protrudes into the fracture groove; the circular thin plate and the center The shafts are connected by keys; there are positioning baffles installed on the central shaft on both sides of the mounting plate, and the mounting plate and the positioning baffles are locked by locking nuts; The workpiece is clamped by the fixture, and after rough turning and experimental parameter processing are sequentially performed, the required machined surface inspection sample is effectively broken at the designed fracture groove position, and the corresponding machined surface inspection sample is directly obtained. 2. a kind of preventing reprocessing as claimed in claim 1 obtains continuous turning titanium alloy surface detection sample fixture, it is characterized in that, described workpiece is the annular structure consistent with the thickness of the mounting plate, and the radius of the workpiece is larger than the mounting plate ; The inner ring of the workpiece is provided with a raised portion that matches the fracture groove, and the side of the raised portion is provided with a clamping groove, which is matched with the positioning portion on the mounting plate; the workpiece is just installed in the described On the mounting plate, there is no gap between the two after they are matched, forming a complete annular structure. 3 . The fixture for preventing reprocessing to obtain continuous turning titanium alloy surface detection sample fixture according to claim 1 , wherein the shape of the mounting plate and the workpiece is completed by wire cutting technology. 4 . 4 . The test sample fixture for preventing reprocessing to obtain continuous turning of titanium alloy surfaces according to claim 1 , wherein a limit key is further provided on the central axis to limit the positioning baffle. 5 . 5. A kind of fixture for preventing reprocessing to obtain continuous turning titanium alloy surface detection sample fixture as claimed in claim 1, it is characterized in that, described positioning baffle comprises left positioning baffle and right positioning baffle, left positioning baffle And the right positioning baffle is circular, and its size is determined according to the size of the workpiece; the middle part of the left positioning baffle and the right positioning baffle is a hollow circle with a keyway. 6 . The sample fixture for preventing reprocessing to obtain continuous turning titanium alloy surface detection samples as claimed in claim 1 , wherein the size of the positioning baffle is determined by the design of the keyway on the mounting plate, the workpiece and the baffle. 7 . 7 . The test sample fixture for preventing reprocessing to obtain continuously turning titanium alloy surfaces as claimed in claim 1 , wherein the end of the central shaft is provided with threads to cooperate with the locking nut. 8 . 8. A method for carrying out a cutting experiment using the described holder for preventing reprocessing from any one of claims 1-7 to obtain continuous turning titanium alloy surface detection specimens, characterized in that, Step 1. Use wire cutting technology to process the mounting plate and the workpiece in advance; both sides of the workpiece must be polished before cutting; Step 2. Hold the central axis on the three-jaw chuck of the CNC lathe, then install the left positioning baffle, the mounting plate, the workpiece, and the right positioning baffle in sequence, and use the limit key and lock nut to fix it, and finally Use the top of the machine tool to fix the central axis; Step 3. Rough turning the outer circle of the workpiece first, so that the surface to be machined and the central axis of the workpiece are on the same cylindrical surface; continue rough turning, so that the space between the machining surface of the workpiece and the outermost ring of the mounting plate satisfies the reservation. The requirement of this distance is that it can not only ensure the removal amount in the cutting process, but also ensure that the test sample can be obtained smoothly after the cutting experiment is completed; Step 4. Continue to process the workpiece according to the set cutting experiment parameters; after the cutting experiment is completed, remove the processed workpiece, and the required machined surface inspection sample is effectively broken at the designed fracture groove position, and directly obtained The test sample of the corresponding machined surface no longer needs secondary auxiliary processing.

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