Water cutting device and water cutting method for titanium alloy thick plate

Abstract

The invention belongs to the technical field of titanium alloy plate machining, and particularly provides a water cutting device and method for a titanium alloy thick plate, and the water cutting device for the titanium alloy thick plate comprises a water cutting assembly; the water cutting assembly comprises a sand mixing chamber, a connecting pipeline and a nozzle; the connecting pipeline is used for connecting the sand mixing chamber and the nozzle; a cutting nozzle used for cutting is arranged on the nozzle, and the cutting nozzle is arranged to be of a linear structure. The shape of the cutting nozzle is set to be the rectangular nozzle, so that the ejected water flow is changed into the prismatic shape from the cylindrical shape, and the water flow after water cutting is induced to flow towards the two sides of the long edge of the rectangular nozzle, so that a cavity formed in the lower part by a first cutter during two-cutter cutting is avoided, and the surface quality is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of titanium alloy plate processing, and relates to a water cutting device and a water cutting method for thick titanium alloy plates. Background Art

[0002] Water cutting, also known as water jet, is a machine that uses high-pressure water flow to cut workpieces. Due to its characteristics such as low cost, easy operation, environmental friendliness, and cold cutting, it is widely used in the field of metal cutting and processing. For titanium alloys, because of their poor heat conduction ability and the fact that hot processing will produce a heat affected zone that induces phase transformation, resulting in deterioration of the material structure and properties, titanium alloys are very suitable for cutting with a water jet during processing.

[0003] However, in the current technology, when using a water jet to cut thick titanium alloy plates, due to limitations such as water pressure, relatively deep water cutting marks will be left on the cutting surface, so secondary processing of the cutting surface is still required. Usually, in order to avoid the appearance of water cutting marks, the cutting speed needs to be adjusted extremely slowly to reduce the water cutting marks, which results in low efficiency. Summary of the Invention

[0004] The present invention aims to provide a water cutting device and a water cutting method for thick titanium alloy plates that can significantly reduce the water cutting marks on the cutting surface, improve work efficiency, and ensure the quality of the cutting surface.

[0005] The present invention provides a water cutting device for thick titanium alloy plates, including a water cutting assembly;

[0006] The water cutting assembly includes a sand mixing chamber, a connecting pipe, and a nozzle;

[0007] The connecting pipe is used to connect the sand mixing chamber and the nozzle;

[0008] A cutting nozzle for cutting is provided on the nozzle, and the cutting nozzle is set in a linear structure.

[0009] Further, the nozzle includes an integrally formed connecting section and a nozzle section;

[0010] The connecting section is set in a structure that cooperates with the connecting pipe;

[0011] The nozzle section is set in a conical structure, and its larger end is used to connect with the connecting section, and its smaller end is provided with a cutting nozzle.

[0012] Further, the central axis of the cutting nozzle coincides with the central axis of the nozzle, and the size of the cutting nozzle is set to 0.1 mm × 0.2 mm.

[0013] Further, the connecting section of the nozzle and the connecting pipe are connected to each other in a detachable manner.

[0014] In addition to the above structure, the water cutting device for thick titanium alloy plates further includes a displacement assembly for driving the water cutting assembly to displace, and the displacement assembly is detachably mounted on the water cutting platform.

[0015] Furthermore, the displacement assembly includes a frame beam, a Y-axis adjusting member, an X-axis adjusting member, and a Z-axis adjusting member;

[0016] There are two sets of Y-axis adjusting members arranged side by side. A single set of Y-axis adjusting members includes a first fixed part and a first movable part that match each other. The first fixed part is used for detachable connection with the water cutting platform;

[0017] There are two frame beams provided corresponding to the two Y-axis adjusting members one by one. One end of a single frame beam is fixedly connected to the first movable part, and the other end of the single frame beam extends upward in the vertical direction;

[0018] The X-axis adjusting member includes a second fixed part and a second movable part that match each other. Both ends of the second fixed part are fixedly connected to the two frame beams;

[0019] The Z-axis adjusting member includes a third fixed part and a third movable part that match each other. The third fixed part is fixedly connected to the second movable part, and the third fixed part is arranged along the vertical direction; the water cutting assembly is fixedly arranged on the third movable part.

[0020] In addition to the above structure, the water cutting device for thick titanium alloy plates further includes a laser positioning device. The laser positioning device is arranged at the edge of the water cutting platform and is used for quickly positioning the workpiece to be processed at the start of cutting.

[0021] Furthermore, the laser positioning device includes a laser guide rail and a laser emitter movably arranged on the laser guide rail;

[0022] There are two laser guide rails respectively arranged on the X-axis and Y-axis of the water cutting platform;

[0023] There are two laser emitters provided corresponding to the two laser guide rails one by one. The two laser emitters displace respectively on the two laser guide rails.

[0024] In addition to the above structure, the water cutting device for thick titanium alloy plates further includes a pressurization system and a sand storage system;

[0025] The pressurization system is used for pressurizing the filtered water, and the pressurization system is connected to the sand mixing chamber through a high-pressure pipeline;

[0026] The sand storage system includes a sand tank and a sand pipe; the sand tank is used for storing water jet sand; the sand pipe connects the sand tank and the sand mixing chamber and is used for transporting the water jet sand into the sand mixing chamber.

[0027] The present invention also provides a water cutting method for thick titanium alloy plates, comprising the following steps:

[0028] Step 1: Preparation work;

[0029] Lift the workpiece to be processed onto the water cutting platform;

[0030] Mutually assemble the water cutting device for thick titanium alloy plates as described above with the existing water cutting platform;

[0031] Use the laser positioning device to position the relative positions between the workpiece and the water cutting platform and between the workpiece and the water cutting device, so that the water cutting device is placed directly above the workpiece;

[0032] Step 2: Calibrate the relative position between the workpiece and the cutting nozzle in the water cutting device;

[0033] Drive the displacement assembly to drive the cutting nozzle to displace to one side of any edge of the workpiece;

[0034] When the displacement assembly drives the cutting nozzle to displace away from the workpiece to a position with a distance of 3 mm - 10 mm from the surface to be processed of the workpiece, zero the Y-axis adjuster, X-axis adjuster, and Z-axis adjuster in the displacement assembly to complete the calibration of the relative position between the workpiece and the cutting nozzle;

[0035] Step 3: Set the cutting parameters;

[0036] Based on the thickness of the workpiece and the processing requirements of the workpiece, set the water pressure during cutting, the traveling speed during cutting, and the cutting length of the workpiece respectively;

[0037] Step 4: Cut the workpiece based on the set parameters;

[0038] Based on the overall thickness of the workpiece, cut it in two layers, wherein the thickness of the first layer is set to be greater than or equal to 50% of the overall thickness of the workpiece;

[0039] Step 5: Detect the flatness of the water cutting surface. When the flatness of the water cutting surface after cutting does not meet the specified requirements, adjust the distance between the cutting nozzle and the workpiece surface, and cut the water cutting surface again until the surface flatness of the water cutting surface after cutting meets the specified requirements.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] (1) The water cutting device for titanium alloy thick plates provided by the present invention sets the shape of the cutting nozzle as a rectangular nozzle with a size of 0.1mm×0.2mm, so that the ejected water flow changes from a cylindrical shape to a rhombus shape, inducing the water flow after water cutting to flow to both sides of the long side of the rectangular opening, thereby avoiding the holes formed in the lower part during the first cut in two - knife cutting and improving the surface quality.

[0042] (2) The water cutting method for titanium alloy thick plates provided by the present invention effectively compensates for the energy dissipation problem caused by insufficient water pressure and / or too thick workpieces in the prior art by adopting the two - knife cutting method, while ensuring the quality of the cutting surface and taking into account the cutting efficiency.

[0043] In addition to the purposes, features and advantages described above, the present invention has other purposes, features and advantages. The following will refer to the drawings for a more detailed description of the present invention. Description of the Drawings

[0044] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0045] Figure 1 is a schematic structural diagram of the water cutting assembly in the embodiment of the present invention;

[0046] Figure 2 is Figure 1 a schematic cross - sectional view of the nozzle at the nozzle opening in ;

[0047] Figure 3 is a schematic structural diagram of the displacement assembly in the embodiment of the present invention;

[0048] Figure 4 is a top - view schematic diagram of the mutual connection of the laser positioning device, the water cutting platform main body, the workpiece and the displacement assembly in the embodiment of the present invention;

[0049] Wherein:

[0050] 01, water cutting platform; 02, workpiece; 1, sand mixing chamber; 2, connecting pipe; 3, nozzle; 3.1, cutting nozzle; 4, frame beam; 5, Y - axis adjusting member; 6, X - axis adjusting member; 7, Z - axis adjusting member; 8, laser guide rail; 9, laser emitter. Detailed Embodiments

[0051] To make the above objects, features, and advantages of the present invention more clearly understandable, the following will provide a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the drawings of the present invention are all in simplified forms and use non-precise scales, only for facilitating and clearly assisting in the description of the embodiments of the present invention; the several mentioned in the present invention are not limited to the specific quantities in the drawing examples; the orientation or positional relationships indicated by 'front','middle', 'back', 'left', 'right', 'upper', 'lower', 'top', 'bottom','middle', etc. in the present invention are all based on the orientation or positional relationships shown in the drawings of the present invention, and do not indicate or imply that the devices or components referred to must have a specific orientation, nor can it be understood as a limitation to the present invention.

[0052] See Figure 1 and Figure 2 As shown, a water cutting device for titanium alloy thick plates provided by the present invention realizes water cutting of the workpiece 02 through mutual cooperation with the existing water cutting platform 01; the water cutting device for titanium alloy thick plates includes a pressurization system, a sand storage system, and a water cutting assembly;

[0053] The water cutting assembly includes a sand mixing chamber 1, a connecting pipe 2, and a nozzle 3; the connecting pipe 2 is used to connect the sand mixing chamber 1 and the nozzle 3;

[0054] The pressurization system is used to pressurize the filtered water to 60,000 Psi, and the pressurization system is connected to the sand mixing chamber 1 through a high-pressure pipe;

[0055] The sand storage system includes a sand tank and a sand pipe; the sand tank is used to store water jet sand (garnet sand); the sand pipe connects the sand tank and the sand mixing chamber 1 and is used to transport the water jet sand (garnet sand) into the sand mixing chamber 1.

[0056] Preferably, the nozzle 3 includes an integrally formed connecting section and a nozzle section; the connecting section is configured to cooperate with the connecting pipe 2; the nozzle section is configured as a conical structure, and its larger end is used to connect to the connecting section, and its smaller end is provided with a cutting nozzle 3.1.

[0057] Further preferably, the cutting nozzle 3.1 is configured as a linear structure, and the central axis of the cutting nozzle 3.1 coincides with the central axis of the nozzle 3, and the size of the cutting nozzle (3.1) is preferably set to 0.1 mm × 0.2 mm.

[0058] Further preferably, the connecting section of the nozzle 3 and the connecting pipe 2 are detachably connected to each other so that the nozzle 3 can be quickly disassembled and assembled. Specifically, the connecting section of the nozzle 3 and the connecting pipe 2 are connected to each other by bolts.

[0059] In addition to the above structure, the water cutting device for thick titanium alloy plates further includes a displacement component for driving the water cutting component to displace, and the displacement component is detachably installed on the water cutting platform 01.

[0060] Preferably, as shown in Figure 3 the displacement component includes a frame beam 4, a Y-axis adjustment member 5, an X-axis adjustment member 6, and a Z-axis adjustment member 7;

[0061] There are two sets of Y-axis adjustment members 5 arranged in parallel. A single set of Y-axis adjustment members 5 includes a first fixed part and a first movable part that match each other, and the first fixed part is used for detachably connecting with the water cutting platform 01;

[0062] There are two frame beams 4 arranged in one-to-one correspondence with the two Y-axis adjustment members 5. One end of a single frame beam 4 is fixedly connected to the first movable part, and the other end of a single frame beam 4 extends upward in the vertical direction;

[0063] The X-axis adjustment member 6 includes a second fixed part and a second movable part that match each other, and both ends of the second fixed part are fixedly connected to the two frame beams 4;

[0064] The Z-axis adjustment member 7 includes a third fixed part and a third movable part that match each other. The third fixed part is fixedly connected to the second movable part and is arranged along the vertical direction; the water cutting component is fixedly arranged on the third movable part.

[0065] More preferably, the Y-axis adjustment member 5, the X-axis adjustment member 6, and the Z-axis adjustment member 7 are all preferably set as linear drive modules.

[0066] In addition to the above structure, the water cutting device for thick titanium alloy plates further includes a laser positioning device, and the laser positioning device is arranged on the side of the water cutting platform 01 and is used for quickly positioning the workpiece 02 to be processed at the start of cutting.

[0067] Preferably, as shown in Figure 4 the laser positioning device includes a laser guide rail 8 and a laser emitter 9 movably arranged on the laser guide rail 8. There are two laser guide rails 8 respectively arranged on the X-axis and Y-axis of the water cutting platform 01. There are two laser emitters 9 arranged in one-to-one correspondence with the two laser guide rails 8. The two laser emitters 9 displace on the two laser guide rails 8 respectively to accurately position the processing position of the workpiece 02.

[0068] As a further embodiment of the present invention, the present invention also provides a water cutting method for thick titanium alloy plates, including the following steps:

[0069] Step 1: Preparation work;

[0070] Lift the workpiece to be processed onto the water cutting platform;

[0071] Assemble the above-mentioned water cutting device with the existing water cutting platform;

[0072] Use the laser positioning device to position the relative positions between the workpiece and the water cutting platform and between the workpiece and the water cutting device, so that the water cutting device is placed directly above the workpiece;

[0073] Step 2: Calibrate the relative position between the workpiece and the cutting nozzle in the water cutting device;

[0074] Drive the displacement component to drive the cutting nozzle to displace to one side of any edge of the workpiece;

[0075] When the displacement component drives the cutting nozzle to displace away from the workpiece to a position with a distance of 3 mm - 10 mm from the surface to be processed of the workpiece, zero the Y-axis adjuster, X-axis adjuster, and Z-axis adjuster in the displacement component to complete the calibration of the relative position between the workpiece and the cutting nozzle. That is, set the position with a distance of 3 mm - 10 mm between the cutting nozzle and the workpiece as the cutting start origin.

[0076] Step 3: Set the cutting parameters;

[0077] Based on the thickness of the workpiece and the processing requirements of the workpiece, set the water pressure during cutting, the traveling speed during cutting, and the cutting length of the workpiece respectively.

[0078] Step 4: Cut the workpiece based on the set parameters;

[0079] Based on the thickness of the workpiece, perform cutting in a layered manner, specifically as follows:

[0080] Based on the overall thickness of the workpiece, divide it into two layers for cutting, where the thickness of the first layer is set to be greater than or equal to 50% of the overall thickness of the workpiece.

[0081] Step 5: Detect the flatness of the water cutting surface. When the flatness of the water cutting surface after cutting does not meet the specified requirements, adjust the distance between the cutting nozzle and the workpiece surface, and cut the water cutting surface again until the surface flatness of the water cutting surface after cutting meets the specified requirements.

[0082] Example:

[0083] For an 80-mm-thick TC4 titanium plate, the "one-shaped" nozzle + two-knife cutting method is adopted (the process parameters for the first knife: water pressure: 300 MPa, cutting speed 80 mm / min; the process parameters for the second knife: water pressure 300 MPa, cutting speed 50 mm / min); manually adjust the distance between the nozzle and the upper surface of the workpiece to about 5 mm, set the cutting path as a straight line along the long side of the "one-shaped" nozzle, the cutting length is 100 mm, and almost no water cutting marks can be observed on the surface after cutting.

[0084] Comparative Example 1:

[0085] For an 80-mm-thick TC4 titanium plate, a circular nozzle is used for one-knife cutting (the process parameters: water pressure: 300 MPa, cutting speed 20 mm / min), manually adjust the distance between the nozzle and the upper surface of the workpiece to about 5 mm, set the cutting path as a straight line, the cutting length is 100 mm, and relatively deep water cutting marks are left on the surface after cutting, and the depth of the water cutting marks is about 0.5 mm.

[0086] Comparative Example 2:

[0087] For an 80-mm-thick TC4 titanium plate, the ordinary circular nozzle two-knife cutting method is adopted (the process parameters for the first knife: water pressure: 300 MPa, cutting speed 40 mm / min; the process parameters for the second knife: water pressure 300 MPa, cutting speed 40 mm / min), manually adjust the distance between the nozzle and the upper surface of the workpiece to about 5 mm, set the cutting path as a straight line, the cutting length is 100 mm, and there are multiple pits on the lower surface after cutting, and the depth of the pits is about 0.5 - 1 mm.

[0088] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A water jet cutting device for titanium alloy thick plates, characterized in that: Includes water jet cutting components; The water jet cutting assembly comprises a sand mixing chamber (1), a connecting pipe (2) and a nozzle (3); The connecting pipe (2) is used to connect the sand mixing chamber (1) and the nozzle (3); A cutting nozzle (3.1) for cutting is provided on the nozzle (3), and the cutting nozzle (3.1) is arranged in a straight line structure.

2. The water jet cutting device for titanium alloy thick plate according to claim 1 is characterized in that: The nozzle (3) comprises an integrally formed connecting section and a nozzle section; The connecting section is configured as a structure that cooperates with the connecting pipe (2); The nozzle section is arranged as a conical structure, and its larger end is used to be connected to the connecting section, and its smaller end is provided with a cutting nozzle (3.1).

3. The water jet cutting device for titanium alloy thick plate according to claim 1, characterized in that: The central axis of the cutting nozzle (3.1) is arranged to coincide with the central axis of the nozzle (3), and the size of the cutting nozzle (3.1) is set to 0.1 mm×0.2 mm.

4. The water jet cutting device for titanium alloy thick plate according to any one of claims 1 to 3, characterized in that: The connecting section of the nozzle (3) and the connecting pipe (2) are connected to each other in a detachable manner.

5. The water jet cutting device for titanium alloy thick plate according to claim 4 is characterized in that: It also includes a displacement component for driving the water cutting component to move, and the displacement component is detachably mounted on the water cutting platform (01).

6. The water jet cutting device for titanium alloy thick plate according to claim 5, characterized in that: The displacement assembly comprises a frame beam (4), a Y-axis adjustment member (5), an X-axis adjustment member (6) and a Z-axis adjustment member (7); The Y-axis adjustment member (5) is provided with two groups arranged in parallel with each other, and a single group of the Y-axis adjustment member (5) comprises a first fixed part and a first movable part which match each other, and the first fixed part is used for being detachably connected with the water jet cutting platform (01); The frame beam (4) is provided with two pieces arranged in a one-to-one correspondence with the two Y-axis adjustment pieces (5), one end of the single frame beam (4) is fixedly connected to the first movable part, and the other end of the single frame beam (4) is extended upward in the vertical direction; The X-axis adjusting member (6) comprises a second fixed portion and a second movable portion that match each other, and two ends of the second fixed portion are respectively fixedly connected to the two frame beams (4); The Z-axis adjusting member (7) comprises a third fixed portion and a third movable portion which match each other, the third fixed portion is fixedly connected to the second movable portion, and the third fixed portion is arranged in a vertical direction; the water cutting assembly is fixedly arranged on the third movable portion.

7. The water jet cutting device for titanium alloy thick plate according to claim 5 or 6, characterized in that: It also includes a laser positioning device, which is arranged on the side of the waterjet cutting platform (01) and is used to quickly position the workpiece (02) to be processed when cutting begins.

8. The water jet cutting device for titanium alloy thick plate according to claim 7, characterized in that: The laser positioning device comprises a laser guide rail (8) and a laser emitter (9) movably arranged on the laser guide rail (8); The laser guide rail (8) is provided with two pieces which are respectively arranged on the X-axis and the Y-axis of the water jet cutting platform (01); The laser emitters (9) are provided with two laser emitters (9) which are arranged in one-to-one correspondence with the two laser guide rails (8), and the two laser emitters (9) are displaced on the two laser guide rails (8) respectively.

9. The water jet cutting device for titanium alloy thick plate according to claim 8, characterized in that: It also includes a pressurization system and a sand storage system; The pressure boosting system is used to boost the pressure of the filtered water, and the pressure boosting system is connected to the sand mixing chamber (1) through a high-pressure pipeline; The sand storage system comprises a sand tank and a sand pipe; the sand tank is used to store water jet sand; the sand pipe connects the sand tank and the sand mixing chamber (1) and is used to transport the water jet sand into the sand mixing chamber (1).

10. A water jet cutting method for titanium alloy thick plate, characterized in that: The following steps are involved: Step 1: Preparation; Lift the workpiece to be processed onto the waterjet cutting platform; Assembling the water jet cutting device for titanium alloy thick plates as claimed in claim 9 with an existing water jet cutting platform; Use a laser positioning device to position the relative position between the workpiece and the water cutting platform and between the workpiece and the water cutting device, so that the water cutting device is placed directly above the workpiece; Step 2: Correct the relative position between the workpiece and the cutting nozzle in the water jet cutting device; A driving displacement assembly is used to drive the cutting nozzle to move to one side of any edge of the workpiece; When the displacement assembly drives the cutting nozzle to move away from the workpiece to a position 3mm-10mm away from the surface to be processed of the workpiece, the Y-axis adjustment member, the X-axis adjustment member and the Z-axis adjustment member in the displacement assembly are all reset to zero, completing the correction of the relative position between the workpiece and the cutting nozzle; Step 3: Set the cutting parameters; Based on the thickness of the workpiece and the processing requirements of the workpiece, the water pressure during cutting, the travel speed during cutting and the cutting length of the workpiece are set respectively; Step 3: Cut the workpiece based on the set parameters; Based on the overall thickness of the workpiece, the workpiece is cut in two layers, wherein the thickness of the first layer is set to be greater than or equal to 50% of the overall thickness of the workpiece; Step 4: Check the flatness of the water-cut surface. If the flatness of the water-cut surface after cutting does not meet the specified requirements, adjust the distance between the cutting nozzle and the workpiece surface, and cut the water-cut surface again until the surface flatness of the water-cut surface after cutting meets the specified requirements.

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