3D printing aluminum alloy sample cutting positioning device and cutting method

Abstract

This invention discloses a 3D printed aluminum alloy sample cutting and positioning device and cutting method, relating to the field of cutting and positioning technology. It includes a wire cutting machine sample mounting frame, a positioning hole, and a fixture base. The wire cutting machine sample mounting frame has a positioning hole on its upper part, and a fixture base is provided at the top of the wire cutting machine sample mounting frame. A positioning bolt penetrating the positioning hole is provided on one side of the fixture base. A first rotating arm fastening bolt is provided on the outer wall of the fixture base, and a rotatable arm is sleeved on the outer wall of the first rotating arm fastening bolt. An adjustable clamping block is provided at the top of the rotatable arm. This device projects the wire cutting wire onto the reference plane of the aluminum alloy sample block to be cut. This method can more clearly show the degree of tilt, and the display effect can be controlled by the position of the light source, thus making it easier to ensure the positional accuracy of the aluminum alloy sample block clamping and the orientation accuracy of the new cutting plane.

Description

Technical Field

[0001] This invention relates to the field of cutting and positioning technology, specifically to a cutting and positioning device and cutting method for 3D printed aluminum alloy samples. Background Technology

[0002] 3D-printed aluminum alloys are lightweight, high-strength, and offer high structural freedom, making them an effective way to reduce weight in aerospace and transportation applications. However, 3D-printed aluminum alloys exhibit anisotropy, with significant differences in microstructure and mechanical properties between the direction perpendicular to the printing substrate and the direction within the substrate plane. Providing printed aluminum alloy test blocks and cutting samples in different orientations using wire electrical discharge machining (EDM) for mechanical property testing is a common method to ensure the quality of 3D-printed aluminum alloy parts. This involves the issue of cutting samples in different orientations, and consequently, controlling the orientation of the newly cut planes. For example, when cutting a tensile sample perpendicular to the substrate, it is necessary to wire-cut a side sheet, and then cut the tensile sample perpendicular to the side sheet. Figure 1 As shown. To ensure uniform thickness of the cut side slices and stretched samples, the cut surface and the side surface must be parallel to each other. To ensure that the new cut plane is parallel to the reference plane (hereinafter referred to as the reference plane, e.g., ...), ... Figure 3 As shown, when clamping the aluminum alloy test block, its reference plane should be parallel to both the wire cutting wire and the direction of its movement (the two constitute the cutting plane). When clamping the test block, the distances L1 and L2 from its two edges to the wire cutting wire are controlled. Figure 3 Making L1=L2 ensures that the reference plane is parallel to the wire cutting wire, but currently this can only be controlled by human observation, which has limited accuracy and cannot guarantee that the movement direction is parallel to the wire cutting wire. There is currently no effective control method to ensure that the new cutting surface is parallel to the reference plane. Summary of the Invention

[0003] The purpose of this invention is to provide a 3D printed aluminum alloy sample cutting and positioning device and cutting method to solve the related problems mentioned in the background art.

[0004] To solve the above technical problems, the present invention provides the following technical solution: a 3D printed aluminum alloy sample cutting and positioning device and cutting method, comprising a wire cutting machine sample mounting frame, a positioning hole and a fixture base. The wire cutting machine sample mounting frame has a positioning hole on its upper part, a fixture base is provided at the top of the wire cutting machine sample mounting frame, and a positioning bolt penetrating the positioning hole is provided on one side of the fixture base. A first rotating arm fastening bolt is provided on the outer wall of the fixture base, and a rotatable arm is sleeved on the outer wall of the first rotating arm fastening bolt. A direction-adjustable clamping block is provided at the top of the rotatable arm, and a second rotating arm fastening bolt is provided at the top of the direction-adjustable clamping block. A rotating arm is sleeved on the outer wall of the second rotating arm fastening bolt, and an I-shaped fixture is provided on one side of the rotating arm. A dovetail groove is provided at the top of the wire cutting machine sample mounting frame, and a moving block is provided inside the dovetail groove. A linear light source is installed on one side of the moving block.

[0005] As a preferred embodiment of the 3D printing aluminum alloy sample cutting and positioning device and cutting method of the present invention, a fixed wire cutting machine is provided above the sample loading frame (1) of the wire cutting machine, and a wire cutting wire (13) for cutting is provided at the output end of the wire cutting machine.

[0006] As a preferred embodiment of the 3D printing aluminum alloy sample cutting and positioning device and cutting method of the present invention, the fixed wire cutting machine is fixed at a suitable position in the sample mounting frame (1) of the cutting machine by means of bolts passing through the positioning hole (2).

[0007] As a preferred embodiment of the 3D printing aluminum alloy sample cutting and positioning device and cutting method of the present invention, the top of the jig (10) is provided with a test block fastening bolt (12) for fixing the position of the aluminum alloy test block (11) to be cut.

[0008] As a preferred embodiment of the 3D printed aluminum alloy sample cutting and positioning device and cutting method of the present invention, the cutting of the aluminum alloy sample block into a vertical tensile sample includes the following steps: S1: Select the side of a 3D-printed aluminum alloy sample block of 30×30×30 mm3 as the reference plane. S2: Use the clamping end of the I-type fixture to mount the aluminum alloy sample block to be cut onto the position-adjustable fixture, and tighten the sample block fastening bolts; S3: Fix the fixture base to the positioning hole and install the fixture base on the wire EDM sample frame. Note that the side should be roughly parallel to the direction of wire EDM wire movement. S4: Rotate the handwheel of the wire EDM machine to make the wire EDM wire contact the upper or lower edge of the side of the aluminum alloy sample block to be cut; S5: Turn on the switch at the linear light source, move the moving block to adjust the position of the linear light source, so that the wire cutting wire produces a projection on the side of the aluminum alloy sample block to be cut; S6: Observe the projection direction. If the projection is vertical, it means that the side is parallel to the wire cutting wire. If the projection is tilted, it means that the side is not parallel to the wire cutting wire. Loosen the first rotating arm fastening bolt at the lower end of the rotatable arm, rotate the lower rotatable arm until the projection is vertical, and tighten the first rotating arm fastening bolt. S7: Move the wire cutting wire to one end of the test block and observe the distance between the wire cutting wire and the side of the aluminum alloy test block. Then move the wire cutting wire to the other end of the test block and observe the distance between the wire cutting wire and the side of the test block. If the two distances are equal, it means that the side is parallel to the direction of movement of the wire cutting wire, and the aluminum alloy test block is correctly clamped. If the two distances are not equal, it means that the side of the aluminum alloy test block is not parallel to the direction of movement of the wire cutting wire, and the orientation of the aluminum alloy test block needs to be adjusted. Loosen the second rotating arm fastening bolt at the upper end of the adjustable clamp, rotate the upper rotating arm, and adjust the orientation of the test block. Move the wire cutting wire and observe whether the distances at both ends are equal. Repeat this adjustment until the two distances are equal. S8: By adjusting the rotatable arm, the side can be parallel to the wire cutting wire and the direction of the wire's movement, and wire cutting can begin to cut thin slices from the side of the aluminum alloy sample block to be cut. The thin slices from the side of the aluminum alloy sample block to be cut are then used to cut the vertically stretched sample.

[0009] As a preferred embodiment of the 3D printing aluminum alloy sample cutting and positioning device and cutting method of the present invention, the linear light source (15) adopts a focusing lens lamp with LED as the light source.

[0010] As a preferred embodiment of the 3D printing aluminum alloy sample cutting and positioning device and cutting method of the present invention, the moving block (14) is fixed in the dovetail groove (3) by clamping bolts.

[0011] As a preferred embodiment of the 3D printed aluminum alloy sample cutting and positioning device and cutting method of the present invention, step S6: project the wire cutting wire onto the reference plane, and the tilt of the projection determines the parallelism between the reference plane and the cutting plane of the aluminum alloy sample block to be cut.

[0012] The beneficial effects of the 3D printed aluminum alloy sample cutting and positioning device and cutting method of the present invention are as follows: 1. This invention consists of two parts: an adjustable clamp base and a movable linear light source. The adjustable clamp is composed of a clamp base, a rotatable arm, and a slot structure on one end of the rotatable arm. During use, the clamping end of the aluminum alloy sample block to be cut is inserted into the slot, and then the sample block fastening bolts are tightened. The clamp base is fixed to the sample mounting frame of the wire cutting machine using a universal clamping plate. By rotating the rotatable arm and the rotatable arm, the clamping position of the aluminum alloy sample block to be cut can be adjusted to achieve the goal of making the reference plane of the aluminum alloy sample block to be cut parallel to the wire cutting wire and its movement direction.

[0013] 2. This invention projects the wire cutting wire onto the reference plane of the aluminum alloy sample block to be cut, and uses the degree of tilt of the projection as an indicator of the parallelism between the two. Compared with the traditional visual inspection method, this method can more clearly show the degree of tilt, and the display effect can be controlled by the position of the light source, thus making it easier to ensure the positional accuracy of the aluminum alloy sample block clamping and the orientation accuracy of the new cutting plane. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the three-dimensional structure of the sample mounting frame for the wire cutting machine according to the present invention. Figure 2 This is a schematic diagram showing the relationship between the vertical tensile specimen cutting method and process of the 3D printed aluminum alloy specimen block to be cut according to the present invention. Figure 3 This is a schematic diagram of the spatial position structure of the alloy to be cut and the wire cutting wire in the wire electrical discharge machining process of the present invention; Figure 4 This is a schematic diagram showing the positional relationship between the reference plane, the wire cutting wire, and the projection before and after the orientation adjustment of the test block in Stage 1 of the present invention. Figure 5 This is a schematic diagram showing the positional relationship between the reference plane, the wire cutting wire, and the projection before and after the orientation adjustment of the test block in Stage 2 of the present invention. Figure 6 This is a schematic diagram illustrating the influence of the light source position on the wire cutting projection position according to the present invention.

[0015] In the diagram: 1. Sample mounting frame for wire EDM machine; 2. Positioning hole; 3. Dovetail groove; 4. Fixture base; 5. First rotating arm fastening bolt; 6. Rotatable arm; 7. Direction-adjustable clamping block; 8. Rotating arm; 9. Second rotating arm fastening bolt; 10. Fixture; 11. Aluminum alloy sample block to be cut; 12. Sample block fastening bolt; 13. Wire EDM wire; 14. Moving block; 15. Linear light source. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Example 1, such as Figure 1 As shown in Figure 4, the present invention provides a technical solution: a 3D printed aluminum alloy sample cutting and positioning device and cutting method, comprising the following methods: Stage 1: Adjust the position of the test block to make the reference plane parallel to the wire cutting wire 13.

[0018] Define a three-dimensional rectangular coordinate system XYZ fixed on the wire EDM machine tool, where the Z-axis is the direction of the wire EDM wire 13, the X-axis is the direction of wire movement, and the Y-axis is perpendicular to Z and X.

[0019] When clamping the aluminum alloy sample block 11 to be cut, manually make a rough adjustment of its position so that its reference plane is roughly parallel to the XZ plane, such as... Figure 4 As shown in Figure a, the wire cutting wire 13 is generally in a vertical position, and the reference plane is not completely parallel to the wire; there is an angle between them. A light source is used to illuminate the wire cutting wire 13 from one side, causing the wire cutting wire 13 to project onto the reference plane of the test block, as shown in Figure a. Figure 4 As shown in a; The reference plane and the wire form an angle, resulting in an angle between the projection and the wire, causing the projection to be tilted. Figure 4 As shown in Figure a, the tilt of the projection reflects the degree to which the test block is not parallel to the wire cutting wire 13, and can be used as a criterion for judging the position adjustment of the test block; Adjust the orientation of the aluminum alloy sample block 11 to be cut, causing its reference plane to rotate around the X-axis, and the projection will also tilt. When the projection is parallel to the wire, the reference plane and the wire cutting wire 13 are parallel. Figure 4 As shown in b; The wire cutting wire 13 is projected onto the reference plane of the aluminum alloy sample block 11 to be cut, and the degree of tilt of the projection is used as an indicator of the parallelism between the two. Compared with the traditional visual inspection method, this method can more clearly show the degree of tilt, and the display effect can be controlled by the position of the light source, thus making it easier to ensure the positional accuracy of the aluminum alloy sample block 11 to be cut and the orientation accuracy of the new cutting plane.

[0020] Example 2, as Figure 1 As shown in Figure 6, this invention provides a technical solution: a 3D printed aluminum alloy sample cutting and positioning device and cutting method. Phase 2: Further adjust the orientation of the test block so that the reference plane of the aluminum alloy test block 11 to be cut is parallel to the x-axis of the wire cutting wire 13.

[0021] Step 1: Move the wire cutting wire 13 to one end of the reference plane of the aluminum alloy sample block 11 to be cut, and observe the distance d1 between the wire and the projection. Figure 5 a.

[0022] Step 2: Move the wire cutting wire 13 to the other end of the reference plane of the test block and observe the distance d2 between the wire and the projection. Figure 5 b.

[0023] Step 3: If d1≈d2, the reference plane is basically parallel to the direction of movement of the wire cutting wire 13, and the position of the test block does not need further adjustment. If d1≠d2, the reference plane is not parallel to the direction of movement of the wire cutting wire 13, and the position of the test block needs to be further adjusted according to the following steps.

[0024] Step 4: Adjust the orientation of the test block to be cut, rotating its reference plane around the Z-axis until d1≈d2, as shown. Figure 5 As shown in c-5d, the reference plane is parallel to the direction of movement of the wire cutting wire 13.

[0025] By using the projection method, the above-mentioned planar cutting control process can achieve higher control precision. Taking the process of adjusting the position of the test block in Example 1 to make the reference plane parallel to the wire cutting wire 13 as an example, the explanation is as follows: Figure 5 The diagram shows the projection relationship between the wire cutting wire 13 and the reference plane of the test block. The upper edge of the reference plane is in contact with the wire cutting wire 13, and the contact point is A. Point B of the wire cutting wire 13 is projected onto the lower edge of the reference plane to produce C1. The foot of the perpendicular from A to the lower edge is D. The angle between the projection AC1 and the perpendicular line AD is α. The larger α is, the more tilted the projection is, and the easier it is to observe. The angle between the wire cutting wire 13 and the perpendicular line AD is β. The less parallel the reference plane is to the wire cutting wire 13, the larger the angle β is. The angle between the projection AC1 and the incident light direction BC1 is θ. Adjusting the position of the light source can change the angle θ.

[0026] According to trigonometric relationships: C1D=AD·tanα BD = AD·sinβ BD / C1D=tanθ Therefore, tanα = sinβ / tanθ When the inclination of the reference plane is fixed, α is inversely proportional to θ; the smaller θ is, the larger α is, the more tilted the projection, and the easier it is to observe. For example... Figure 6 Moving the light source from position 1 to position 2 results in a more tilted projection 2, indicating that the reference plane is not parallel and needs adjustment. Therefore, this optical projection method can amplify the index of the tilt degree of the reference plane, and the amplification effect can be controlled by the position of the light source, thereby ensuring the adjustment accuracy of the reference plane and the clamping position of the test block.

[0027] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A 3D printed aluminum alloy sample cutting and positioning device, comprising a wire cutting machine sample mounting frame (1), a positioning hole (2) and a fixture base (4), wherein the wire cutting machine sample mounting frame (1) is provided with a positioning hole (2) on its upper part, the top of the wire cutting machine sample mounting frame (1) is provided with a fixture base (4), and a positioning bolt penetrating the positioning hole (2) is provided on one side of the fixture base (4), a first rotating arm fastening bolt (5) is provided on the outer wall of the fixture base (4), and a rotatable arm (6) is sleeved on the outer wall of the first rotating arm fastening bolt (5), a direction-adjustable clamping block (7) is provided at the top of the rotatable arm (6), and a second rotating arm fastening bolt (9) is provided at the top of the direction-adjustable clamping block (7), and a rotating arm (8) is sleeved on the outer wall of the second rotating arm fastening bolt (9). A jig (10) is provided on one side of the rotating arm (8), and an aluminum alloy sample block (11) to be cut is held on one side of the jig (10). A dovetail groove (3) is provided at the top of the wire cutting machine sample frame (1), and a moving block (14) is provided inside the dovetail groove (3). A linear light source (15) is installed on one side of the moving block (14). A fixed wire cutting machine is provided above the wire cutting machine sample frame (1), and a wire cutting wire (13) for cutting is provided at the output end of the wire cutting machine. The fixed wire cutting machine is fixed in a suitable position on the cutting machine sample frame (1) by bolts passing through the positioning holes (2). A sample block fastening bolt (12) for fixing the position of the aluminum alloy sample block (11) is provided at the top of the jig (10). The characteristic is that: The process of cutting a vertical tensile specimen from the aluminum alloy specimen block (11) includes the following steps: S1: Select the side of the 3D printed aluminum alloy sample block (11) of 30×30×30 mm3 as the reference plane; S2: The aluminum alloy sample block (11) to be cut is placed on the position-adjustable fixture by clamping the end of the newly processed jig (10), and the sample block fastening bolt (12) is tightened. S3: Fix the fixture base (4) at the positioning hole (2) and install the fixture base (4) on the wire cutting machine sample frame (1). Note that the side should be roughly parallel to the wire cutting wire (13) and the direction of wire movement. S4: Rotate the handwheel of the wire cutting machine to make the wire cutting wire (13) contact the upper or lower edge of the side of the aluminum alloy sample block (11) to be cut; S5: Turn on the switch at the linear light source (15), move the position of the moving block (14) to adjust the position of the linear light source (15), so that the wire cutting wire (13) will project onto the side of the aluminum alloy sample block (11) to be cut. S6: Observe the projection direction. If the projection is vertical, it means that the side is parallel to the wire cutting wire (13). If the projection is tilted, it means that the side is not parallel to the wire cutting wire (13). Loosen the first rotating arm fastening bolt (5) at the lower end of the rotatable arm (6), rotate the lower rotatable arm (6) until the projection is vertical, and tighten the first rotating arm fastening bolt (5). S7: Move the wire cutting wire (13) to one end of the test block and observe the distance between the wire cutting wire (13) and the side of the aluminum alloy test block (11) to be cut. Then move the wire cutting wire (13) to the other end of the test block and observe the distance between the wire cutting wire (13) and the side of the test block. If the two distances are equal, it means that the side is parallel to the direction of movement of the wire cutting wire (13) and the aluminum alloy test block (11) to be cut is in the correct clamping position. If the two distances are not equal, it means that the side of the aluminum alloy test block (11) to be cut is not parallel to the direction of movement of the wire cutting wire (13) and the orientation of the aluminum alloy test block (11) to be cut needs to be adjusted. Loosen the second rotating arm fastening bolt (9) at the upper end of the orientation adjustable clamp, rotate the upper rotating arm (8), adjust the orientation of the test block, move the wire cutting wire (13), and observe whether the distances at both ends are equal. Repeat this adjustment until the two distances are equal. S8: By adjusting the rotatable arm (6) and the rotating arm (8), the side is parallel to the wire cutting wire (13) and the direction of the wire's movement, and wire cutting can begin to cut out the side sheet of the aluminum alloy sample block (11) to be cut, and use the side sheet of the aluminum alloy sample block (11) to cut the vertically stretched sample.

2. The 3D printed aluminum alloy sample cutting and positioning device according to claim 1, characterized in that: The linear light source (15) is a focusing lens lamp with LED as the light source.

3. The 3D printed aluminum alloy sample cutting and positioning device according to claim 1, characterized in that: The movable block (14) is fixed in the dovetail groove (3) by clamping bolts.

4. The 3D printed aluminum alloy sample cutting and positioning device according to claim 1, characterized in that: Step S6: Project the wire cutting wire (13) onto the reference plane of the aluminum alloy sample block (11) to be cut, and determine the parallelism between the reference plane and the cutting plane of the aluminum alloy sample block (11) by the tilt of the projection.

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