Method for milling edge of thin-wall household appliance frame aluminum workpiece with arc-shaped section

Abstract

The invention relates to an arc-section thin-wall household appliance frame aluminum workpiece edge milling method, which is specially implemented for processing a super-long household appliance frame workpiece on a common numerical control milling machine, and through four times of clamping transformation and adopting a specific numerical control milling program, an arc-section thin-wall household appliance frame aluminum workpiece is machined on a common stroke and common model numerical control milling machine. And in addition, the tool has the advantages that positioning is convenient, adaptability is high, clamping is stable, thin-wall workpieces do not deform, vibration in the milling process is small, and machining quality is good.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum workpiece machining, in particular to an edge milling method for an aluminum workpiece with an arc-shaped cross-section and a thin-wall home appliance frame. Background Art

[0002] High-end home appliances such as refrigerators or air conditioner panels and frames are often manufactured with aluminum profiles, which have the advantages of beautiful metallic luster, corrosion resistance, and easy cleaning. In the manufacturing process of home appliance frames, the overall milling of aluminum profiles with thin-walled, curved sections and extra-long lengths is usually a difficult, time-consuming and labor-intensive process. The difficulties lie in the following: 1. The curved section thin-walled aluminum profiles have high requirements for the design of tooling fixtures, which must ensure that the profiles can be clamped firmly while preventing deformation of the profiles due to excessive clamping force; 2. Since thin-walled aluminum workpieces vibrate greatly during milling, good support must be formed around the processing parts of the workpiece during the milling process to prevent uneven milling positions and excessive burrs due to excessive vibration; 3. The entire length of the profile must be fixed firmly on the workpiece, and the workpiece must be properly supported to prevent the uneven milling position and excessive burrs due to excessive vibration; 4. For large-scale processing, the stroke of the processing equipment must match the length of the profile to achieve processing. However, large-stroke processing equipment is expensive, bulky, and consumes a lot of power, which will greatly increase the processing cost of aluminum profile workpieces. Moreover, the clamping table of large-stroke processing equipment is not suitable for installing small-specification tooling equipment. In order to achieve the purpose of processing extra-long workpieces on a small machine, the operator can only choose the secondary clamping method to process the front and back sections of the profile separately. However, the accuracy of the secondary clamping needs to be precisely controlled. If the control is improper, the processing size will be scrapped due to out-of-tolerance. The positioning of the secondary clamping also requires a lot of energy and time for positioning. Summary of the invention

[0003] The purpose of the present invention is to provide a method for milling the edge of an aluminum workpiece of an arc-shaped thin-walled household appliance frame, which is specially implemented for processing an extra-long household appliance frame workpiece on an ordinary CNC milling machine. After four clamping changes and the use of a specific CNC milling program, the processing of the extra-long household appliance frame aluminum workpieces on the left and right sides can be achieved on a CNC milling machine of an ordinary stroke and ordinary model. The tooling has the advantages of convenient positioning, strong adaptability, stable clamping, no deformation of thin-walled workpieces, small vibration during milling, and good processing quality.

[0004] To achieve the above object, the technical solution of the present invention is as follows: The invention discloses a method for milling the edge of an aluminum workpiece of an arc-shaped thin-walled home appliance frame. The base is fixed on a workbench, a plurality of arc-surface fixed tooling units are fixed in the middle of the base, and movable baffles A and B are respectively hinged on the outer sides of the arc-surface fixed tooling units at both ends. End positioning blocks A and end positioning blocks B are respectively arranged at both ends of the base; between the end positioning block A and the movable baffle A, a clamping cylinder and a tightening cylinder A are arranged; between the end positioning block B and the movable baffle B, a clamping cylinder B and a tightening cylinder B are arranged; Milling the aluminum workpieces on the left and right sides of the appliance frame, the milling steps include the following steps: S1, left frame workpiece process 1: movable baffles A and B are lifted, one end of the workpiece is pressed against the end positioning block A, and the other end is pressed against the head of the pressing cylinder B; the CNC milling machine processes within the machinable stroke range; S2, left frame workpiece process 2: movable baffle A is lowered, and movable baffle B is kept raised; one end of the workpiece is pressed against movable baffle A, and the other end is clamped by the chuck of clamping cylinder B; the CNC milling machine processes the remaining amount within the machinable stroke range; S3, right frame workpiece process 1: movable baffle A and movable baffle B are lifted; one end of the workpiece is pressed against the end positioning block B, and the other end is pressed against the head of the pressing cylinder A; the CNC milling machine processes within the machinable stroke range; S4, right frame workpiece process 2: movable baffle B is lowered, and movable baffle A is kept lifted; one end of the workpiece is pressed against movable baffle B, and the other end is clamped by the chuck of the clamping cylinder; the CNC milling machine processes the remaining amount within the machinable stroke range.

[0005] It should be noted that the movable baffle in the raised state will not interfere with or hinder the extension of the piston rod of the tightening cylinder.

[0006] Since there is a slight length error in the frame profile when sawing, one end must be designated as the reference end. The reference ends for the left and right frame edges are located at different ends. Figure 6-7 In the figure, the reference end of the left frame is the left end, so the left end is processed with the movable baffle A and the end positioning block A as the reference zero point; Figure 8-9 In the figure, the reference end of the right frame is the right end, so the right end is processed with the movable baffle B and the end positioning block B as the reference zero point. Therefore, the tooling of the left and right frames can be arranged on the same platform.

[0007] The arc surface fixing tooling unit includes a downward pressing cylinder on one side, and the shape of the pressure head at the end of the piston rod of the downward pressing cylinder matches the edge shape of one side of the workpiece; the arc surface fixing tooling unit includes an edge top block on the other side, and the shape of the edge top block matches the edge shape of the other side of the workpiece; an arc surface support is arranged between the downward pressing cylinder and the edge top block, and the shape of the arc surface support matches the surface shape of the workpiece.

[0008] The base is fixedly connected to the T-slot of the workbench below by bolts. The aluminum workpiece is placed obliquely on the tooling and fixed at both ends by the pressing head and the edge top block, exposing the upper edge to be processed for milling by the processing tool. According to the length of the workpiece, several tooling units can be designed and installed on the base. On the other hand, the base is also divided into two parts. By adjusting the distance between the two halves of the base, the use of tooling units of various lengths can also be realized.

[0009] The clamping cylinder, the jacking cylinder A, the clamping cylinder B and the jacking cylinder B are all rotary cylinders.

[0010] The use of a rotating cylinder can prevent the tightening cylinder and the pressing cylinder from interfering with the movable baffle and other components, thereby achieving compact installation and smooth operation of various tooling components. Advantages of the invention

[0011] 1. The present invention is specially used for the edge milling of aluminum workpieces with curved cross-section and thin walls for home appliance frames. On the same set of tooling, after four clamping changes and the use of a specific CNC milling program, on a CNC milling machine of an ordinary stroke and an ordinary model, the processing of aluminum workpieces with extra-long home appliance frames on the left and right sides can be realized. The mutual combination positioning of the cylinder, movable baffle and end positioning block on the tooling realizes a variety of positioning methods for the workpiece, greatly improves the adaptability of equipment processing, reduces the investment cost of the equipment, and improves the utilization rate of the equipment.

[0012] 2. The arc surface fixing tooling unit and the base of the present invention are used in combination. According to the different lengths of aluminum workpieces, their relative positions and spacings are adjusted, that is, they are adapted for use, with high flexibility. For aluminum workpieces with different cross-sections, the arc surface fixing tooling unit can be replaced to achieve replacement and use, with strong adaptability.

[0013] 3. Although the method of the present invention adopts the processing method of multiple clamping, the positioning of each clamping can also be relatively accurate, and the method of pressing the cylinder top to position - pressing the cylinder down to clamp can also achieve a fool-proof effect, avoiding the operator from placing the workpiece at random and causing inaccurate positioning.

[0014] 4. Since CNC milling machines perform milling within a relatively small stroke, although they are clamped many times, compared with large-scale processing equipment with a long stroke, they avoid ineffective tool travel time, and instead slightly improve processing efficiency and improve production efficiency.

[0015] 5. The arc surface fixed tooling unit has the advantages of firmly clamping the arc surface aluminum workpiece, preventing deformation of thin-walled workpieces, small vibration during milling, being able to absorb most of the vibration caused by milling, and good processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural elevation diagram of the tooling of the present invention; (the end top plate is lowered) Figure 2 This is a structural elevation diagram of the tooling of the present invention; (the end top plate is raised) Figure 3 This is the structural elevation diagram of the tooling of the present invention; (including workbench and aluminum workpiece) Figure 4 This is a side structural diagram of the tooling of the present invention; (including workbench and aluminum workpiece) Figure 5 This is the cross-sectional view of the curved thin-walled aluminum workpiece; Figure 6 This is a schematic diagram of the working state of the left frame workpiece process 1 in step S1; Figure 7 This is a schematic diagram of the working state of the left frame workpiece process 2 in step S2; Figure 8 This is a schematic diagram of the working state of the workpiece process 1 in the right frame of step S3; Fig. 9 This is a schematic diagram of the working state of the workpiece process 2 in the right frame of step S4; The serial numbers and component names in the figure are: 1-workbench; 2-base; 31-end positioning block A; 32-end positioning block B; 41-clamping cylinder A; 42-clamping cylinder B; 51-tension cylinder A; 52-tension cylinder B; 61-movable baffle A; 62-movable baffle B; 71-downward pressure cylinder; 72-arc support; 73-edge top block; 8-workpiece. DETAILED DESCRIPTION Example 1

[0017] The invention discloses a method for milling the edge of an aluminum workpiece with an arc-shaped cross-section and a thin-walled frame of a household appliance. The base 2 is fixed on a workbench 1. A plurality of arc-surface fixed tooling units are fixed in the middle of the base 2. The outer sides of the arc-surface fixed tooling units at both ends are respectively hinged with movable baffles A61 and B62. The two ends of the base 2 are respectively provided with end positioning blocks A31 and B32. Between the end positioning block A31 and the movable baffle A61, a clamping cylinder 41 and a tightening cylinder A51 are provided. Between the end positioning block B32 and the movable baffle B62, a clamping cylinder B42 and a tightening cylinder B52 are provided. Milling structure mirror symmetric left and right home appliance frame aluminum workpiece, the milling steps include the following steps: S1, left frame workpiece process 1: the movable baffles A61 and B62 are lifted, one end of the workpiece 5 is pressed against the end positioning block A31, and the other end is pressed against the head of the pressing cylinder B52; the CNC milling machine processes within the processable stroke range; S2, left frame workpiece process 2: the movable baffle A61 is lowered, and the movable baffle B62 is kept lifted; one end of the workpiece 5 is pressed against the movable baffle A61, and the other end is clamped by the chuck of the clamping cylinder B42; the CNC milling machine processes the remaining amount within the machinable stroke range; S3, right frame workpiece process 1: movable baffle A61 and movable baffle B62 are lifted; one end of workpiece 5 is pressed against end positioning block B32, and the other end is pressed against by the head of pressing cylinder A51; CNC milling machine processes within the processable stroke range; S4, right frame workpiece process 2: the movable baffle B62 is lowered, and the movable baffle A61 is kept lifted; one end of the workpiece 5 is pressed against the movable baffle B62, and the other end is clamped by the chuck of the clamping cylinder 41; the CNC milling machine processes the remaining amount within the machinable stroke range.

[0018] The arc surface fixing tooling unit includes a downward pressing cylinder 71 on one side, and the shape of the pressure head at the end of the piston rod of the downward pressing cylinder 71 matches the edge shape of one side of the workpiece 5; the arc surface fixing tooling unit includes an edge top block 73 on the other side, and the shape of the edge top block 73 matches the edge shape of the other side of the workpiece 5; an arc surface support 72 is arranged between the downward pressing cylinder 71 and the edge top block 73, and the shape of the arc surface support 72 matches the surface shape of the workpiece 5.

[0019] The clamping cylinder 41, the jacking cylinder A51, the clamping cylinder B42 and the jacking cylinder B52 are all rotary cylinders.

Claims

1. The edge milling method of the arc-shaped thin-walled home appliance frame aluminum workpiece is characterized by: The base (2) is fixed on the workbench (1), a plurality of arc surface fixed tooling units are fixed in the middle of the base (2), and movable baffles A (61) and movable baffles B (62) are respectively hinged to the outer sides of the arc surface fixed tooling units at both ends, and end positioning blocks A (31) and end positioning blocks B (32) are respectively arranged at both ends of the base (2); a clamping cylinder (41) and a tightening cylinder A (51) are arranged between the end positioning block A (31) and the movable baffle A (61); a clamping cylinder B (42) and a tightening cylinder B (52) are arranged between the end positioning block B (32) and the movable baffle B (62); Milling of two aluminum workpieces of refrigerator frames on the left and right sides. The milling steps include the following steps: S1, left frame workpiece process 1: the movable baffle A (61) and the movable baffle B (62) are lifted, one end of the workpiece (5) is pressed against the end positioning block A (31), and the other end is pressed against the head of the pressing cylinder B (52); the CNC milling machine processes within the processable stroke range; S2, left frame workpiece process 2: the movable baffle A (61) is lowered, and the movable baffle B (62) is kept raised; one end of the workpiece (5) is pressed against the movable baffle A (61), and the other end is clamped by the chuck of the clamping cylinder B (42); the CNC milling machine processes the remaining amount within the machinable stroke range; S3, right frame workpiece process 1: movable baffle A (61) and movable baffle B (62) are lifted; one end of the workpiece (5) is pressed against the end positioning block B (32), and the other end is pressed against the head of the pressing cylinder A (51); the CNC milling machine processes within the processable stroke range; S4, right frame workpiece process 2: the movable baffle B (62) is lowered, and the movable baffle A (61) is kept raised; one end of the workpiece (5) is pressed against the movable baffle B (62), and the other end is clamped by the chuck of the clamping cylinder (41); the CNC milling machine processes the remaining amount within the machinable stroke range.

2. The method for milling the edge of an aluminum workpiece with an arc-shaped cross-section and a thin-walled frame of an appliance according to claim 1, characterized in that: The arc surface fixing fixture unit comprises a downward pressing cylinder (71) on one side, and the shape of the pressing head at the end of the piston rod of the downward pressing cylinder (71) matches the shape of the edge of one side of the workpiece (5); The arc surface fixing fixture unit comprises an edge top block (73) on the other side, the shape of the edge top block (73) matching the shape of the edge on the other side of the workpiece (5); an arc surface support (72) is arranged between the downward pressure cylinder (71) and the edge top block (73), the shape of the arc surface support (72) matching the surface shape of the workpiece (5).

3. The method for milling the edge of an aluminum workpiece with an arc-shaped cross-section and a thin-walled frame of an appliance according to claim 1, characterized in that: The clamping cylinder (41), the jacking cylinder A (51), the clamping cylinder B (42) and the jacking cylinder B (52) are all rotary cylinders.

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