Arc-shaped cross-section thin-wall household appliance frame aluminum workpiece edge milling method

Abstract

The application relates to a method for milling the edge of an arc-shaped cross-section thin-wall household appliance frame aluminum workpiece, which is suitable for processing the household appliance frame workpiece with an ultra-long size on a common numerical control milling machine. Through four clamping transformations and by adopting a specific numerical control milling program, the left and right side ultra-long household appliance frame aluminum workpieces can be processed on a common stroke common type numerical control milling machine, and the method has the advantages of convenient positioning, strong adaptability, stable clamping, no deformation of the thin-wall workpiece, small vibration in the milling process, good processing quality and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aluminum workpiece machining, in particular to an edge milling method for an arc cross-section thin-wall household appliance frame aluminum workpiece. BACKGROUND

[0002] High-end household appliances such as refrigerator or air conditioner panels and frames are often manufactured by processing aluminum profile workpieces, which have the advantages of metal luster, corrosion resistance, easy cleaning, etc. In the manufacturing process of household appliance frames, the overall milling of aluminum profile workpieces with thin-wall arc cross-section and super-long length is usually a difficult and time-consuming process, which is difficult in that: 1. The arc cross-section thin-wall aluminum profile requires high design of the fixture, which not only ensures the stability of the profile, but also prevents deformation caused by excessive clamping force; 2. Due to the large vibration of the thin-wall aluminum workpiece during milling, a good support around the processing part of the workpiece must be formed during the milling process to prevent uneven milling position and excessive burrs caused by excessive vibration; 3. The overall processing of large length profile requires that the processing equipment stroke must match the profile length to achieve processing, but the large stroke processing equipment is expensive, bulky, and consumes a lot of electricity, which greatly increases the processing cost of aluminum profile workpieces, and the clamping table of large stroke processing equipment is not suitable for installing small scale processing equipment; In order to process super-long workpieces on a small machine table, the operator can only choose to clamp twice, and process the front and rear sections of the profile respectively, but the precision of the second clamping needs to be accurately controlled, otherwise the processing size will be out of tolerance and scrapped; The positioning of the second clamping also requires a lot of effort and time to position. SUMMARY

[0003] The purpose of the present application is to provide an edge milling method for an arc cross-section thin-wall household appliance frame aluminum workpiece, which is specifically applied to the processing of super-long household appliance frame workpieces on a common numerical control milling machine. Through four clamping changes and the use of a specific numerical control milling program, the left and right side super-long household appliance frame aluminum workpieces can be processed on a common stroke and ordinary type numerical control milling machine, and the fixture has the advantages of convenient positioning, strong adaptability, stable clamping, no deformation of thin-wall workpieces, small vibration during milling, good processing quality, etc.

[0004] To achieve the above purpose, the technical scheme of the present application is as follows:

[0005] The edge milling method of the arc cross-section thin-wall household appliance frame aluminum workpiece includes the following steps: a base is fixed on a workbench, a plurality of arc surface fixed tool units are fixed in the middle of the base, movable baffles A and B are respectively hinged outside the two end arc surface fixed tool units, end positioning blocks A and B are respectively arranged at the two ends of the base; a clamping cylinder and a pressing cylinder A are arranged between the end positioning block A and the movable baffle A; a clamping cylinder B and a pressing cylinder B are arranged between the end positioning block B and the movable baffle B;

[0006] The left and right household appliance frame aluminum workpieces are milled, and the milling steps include the following steps:

[0007] S1, left frame workpiece process 1: the 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 pressing head of the pressing cylinder B; the numerical control milling machine processes the range within the processable stroke;

[0008] S2, left frame workpiece process 2: the movable baffle A is lowered, the movable baffle B is kept lifted; one end of the workpiece is pressed against the movable baffle A, and the other end is clamped by the chuck of the clamping cylinder B; the numerical control milling machine processes the remaining amount within the processable stroke;

[0009] S3, right frame workpiece process 1: the movable baffles A and B are lifted; one end of the workpiece is pressed against the end positioning block B, and the other end is pressed against the pressing head of the pressing cylinder A; the numerical control milling machine processes the range within the processable stroke;

[0010] S4, right frame workpiece process 2: the movable baffle B is lowered, the movable baffle A is kept lifted; one end of the workpiece is pressed against the movable baffle B, and the other end is clamped by the chuck of the clamping cylinder; the numerical control milling machine processes the remaining amount within the processable stroke.

[0011] It should be particularly noted that the movable baffle in the lifted state does not interfere with and hinder the extension of the piston rod of the pressing cylinder.

[0012] Since there is a slight length error in the sawing of the frame profile, one end must be designated as the reference end. The reference ends of the left and right frame edge processing are located at different ends, and the Figures 6-7 reference end of the left frame is the left end, so the left end is processed as the zero point with the movable baffle A and the end positioning block A as the reference; Figures 8-9 the reference end of the right frame is the right end, so the right end is processed as the zero point with the movable baffle B and the end positioning block B as the reference. Thus, the tooling of the left and right frames can be arranged on the same platform.

[0013] The arc surface fixing tool unit comprises a lower pressing cylinder on one side, and the pressing head at the end of the piston rod of the lower pressing cylinder is shaped to match the shape of the edge of the workpiece; the arc surface fixing tool unit comprises an edge top block on the other side, and the edge top block is shaped to match the shape of the edge of the workpiece; an arc surface support is arranged between the lower pressing cylinder and the edge top block, and the arc surface support is shaped to match the shape of the surface of the workpiece.

[0014] The base is fixedly connected with the T-shaped groove of the workbench below through bolts, the aluminum workpiece is obliquely placed on the tool, the two ends are fixed by the pressing head and the edge top block, the edge to be machined on the upper side is exposed, and is milled by a machining tool; according to the length of the workpiece, a plurality of tool units can be designed and installed on the base, on the other hand, the base is also divided into two parts, and by adjusting the distance between the two half bases, various length tool units can also be used.

[0015] The clamping cylinder, the pressing cylinder A, the clamping cylinder B and the pressing cylinder B are all rotary cylinders.

[0016] The rotary cylinder can avoid interference between the pressing cylinder and the pressing cylinder and other components, and realize compact installation and smooth work of the tool components.

[0017] Advantages of the present application

[0018] 1. The present application is specially used for edge milling of an arc-shaped cross-section thin-wall household appliance frame aluminum workpiece, four clamping changes are carried out on the same tool, and a specific numerical control milling program is used, so that left and right side long household appliance frame aluminum workpieces can be machined on a common stroke ordinary numerical control milling machine, the mutual combination and positioning of the cylinders, the movable baffle and the end positioning block on the tool realize various positioning modes of the workpiece, the adaptability of the equipment processing is greatly improved, the investment cost of the equipment is reduced, and the utilization rate of the equipment is improved.

[0019] 2. The arc surface fixing tool unit and the base of the present application are used in combination, the mutual position and distance are adjusted according to aluminum workpieces of different lengths, that is, adaptive use, and the flexibility is high; for aluminum workpieces of different cross sections, the arc surface fixing tool unit can be replaced to realize replacement use, and the adaptability is strong.

[0020] 3. Although the method of the present application adopts the mode of multiple clamping, the positioning of each clamping can also be relatively accurate, and the cylinder pressing and pressing positioning - lower pressing cylinder clamping mode can also achieve the foolproof effect, avoiding the situation that the operator places the workpiece at will to cause inaccurate positioning.

[0021] 4. Since the numerical control milling machine is milled in a relatively small stroke, although multiple clamping is carried out, compared with a long-stroke large-scale processing equipment, the invalid walking time of the tool is avoided, and the processing efficiency is slightly improved, thereby improving the production efficiency.

[0022] 5. The arc surface fixing tool unit has the advantages of stable clamping, no deformation of thin-walled workpieces, small vibration in the milling process, good processing quality, etc. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a vertical plane structure diagram of the tool of the present application; (end top plate is put down)

[0024] Figure 2 It is a vertical plane structure diagram of the tool of the present application; (end top plate is lifted up)

[0025] Figure 3 It is a vertical plane structure diagram of the tool of the present application; (including workbench, aluminum workpiece)

[0026] Figure 4 It is a side structure diagram of the tool of the present application; (including workbench, aluminum workpiece)

[0027] Figure 5 It is a cross-sectional view of the arc surface thin-walled aluminum workpiece;

[0028] Figure 6 It is a working state schematic diagram of step S1 left frame workpiece process 1;

[0029] Figure 7 It is a working state schematic diagram of step S2 left frame workpiece process 2;

[0030] Figure 8 It is a working state schematic diagram of step S3 right frame workpiece process 1;

[0031] Figure 9 It is a working state schematic diagram of step S4 right frame workpiece process 2;

[0032] The serial number and component name 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-tightening cylinder A; 52-tightening cylinder B; 61-movable baffle A; 62-movable baffle B; 71-pressing cylinder; 72-arc surface support; 73-edge top block; 8-workpiece. DETAILED DESCRIPTION Example 1

[0033] The edge milling method of the arc cross-section thin-wall household appliance frame aluminum workpiece edge includes the following steps: a base 2 is fixed on a workbench 1, a plurality of arc surface fixed tool units are fixed in the middle of the base 2, the outer sides of the two end arc surface fixed tool units are respectively hinged with movable baffles A61 and B62, and end positioning blocks A31 and B32 are respectively arranged at the two ends of the base 2; a clamping cylinder 41 and a pressing cylinder A51 are arranged between the end positioning block A31 and the movable baffle A61; and a clamping cylinder B42 and a pressing cylinder B52 are arranged between the end positioning block B32 and the movable baffle B62.

[0034] The left and right household appliance frame aluminum workpieces are mirror-symmetrically milled in structure, and the milling steps include the following steps:

[0035] 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 pressing head of the pressing cylinder B52; and the numerical control milling machine is used to process the workpiece within the range of the workable stroke.

[0036] S2, left frame workpiece process 2: the movable baffle A61 is put down, 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; and the numerical control milling machine is used to process the remaining amount within the range of the workable stroke.

[0037] S3, right 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 B32, and the other end is pressed against the pressing head of the pressing cylinder A51; and the numerical control milling machine is used to process the workpiece within the range of the workable stroke.

[0038] S4, right frame workpiece process 2: the movable baffle B62 is put down, 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; and the numerical control milling machine is used to process the remaining amount within the range of the workable stroke.

[0039] The arc surface fixed tool unit includes a lower pressing cylinder 71 on one side, the pressing head at the end of the piston rod of the lower pressing cylinder 71 matches the shape of one side edge of the workpiece 5; the arc surface fixed tool unit includes an edge pressing block 73 on the other side, the shape of the edge pressing block 73 matches the shape of the other side edge of the workpiece 5; an arc surface support 72 is arranged between the lower pressing cylinder 71 and the edge pressing block 73, and the shape of the arc surface support 72 matches the shape of the surface of the workpiece 5.

[0040] The clamping cylinder 41, the pressing cylinder A51, the clamping cylinder B42 and the pressing cylinder B52 are all rotary cylinders.

Claims

1. A method for edge milling of an arc cross-section thin-walled frame aluminum workpiece of a household appliance, characterized in that: The base (2) is fixed on the workbench (1), the middle part of the base (2) is fixed with a plurality of arc surface fixing tool units, the outer sides of the two end arc surface fixing tool units are respectively hinged with movable baffle A (61) and movable baffle B (62), and the two end parts of the base (2) are respectively provided with end positioning block A (31) and end positioning block B (32); a clamping cylinder (41) and a pressing 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 pressing cylinder B (52) are arranged between the end positioning block B (32) and the movable baffle B (62); The left and right refrigerator frame aluminum workpieces are milled, and the milling steps include the following steps: S1, left 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 A (31), and the other end is pressed against the pressing head of the pressing cylinder B (52); the numerical control milling machine processes the range within the processable stroke; S2, left frame workpiece process 2: movable baffle A (61) is lowered, movable baffle B (62) is kept lifted; one end of the workpiece (5) is pressed against movable baffle A (61), and the other end is clamped by the chuck of the clamping cylinder B (42); the numerical control milling machine processes the remaining amount within the processable stroke; 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 pressing head of the pressing cylinder A (51); the numerical control milling machine processes the range within the processable stroke; S4, right frame workpiece process 2: movable baffle B (62) is lowered, movable baffle A (61) is kept lifted; one end of the workpiece (5) is pressed against movable baffle B (62), and the other end is clamped by the chuck of the clamping cylinder (41); the numerical control milling machine processes the remaining amount within the processable stroke.

2. The method of claim 1, wherein the method further comprises: after the milling, performing a second milling of the edge of the arc-shaped cross-section thin-walled frame aluminum workpiece. The arc surface fixing tool unit includes a lower pressing cylinder (71) on one side, and the pressing head at the piston rod end of the lower pressing cylinder (71) is shaped to match the shape of one side edge of the workpiece (5); The arc surface fixing tool unit includes another side edge pressing block (73), and the shape of the side edge pressing block (73) matches the shape of the other side edge of the workpiece (5); an arc surface support (72) is arranged between the lower pressing cylinder (71) and the side edge pressing block (73), and the shape of the arc surface support (72) matches the surface shape of the workpiece (5).

3. The method of claim 1, wherein the arc-shaped cross-section thin-wall frame aluminum workpiece edge milling method is characterized in that: The clamping cylinder (41), the pressing cylinder A (51), the clamping cylinder B (42) and the pressing cylinder B (52) are all rotary cylinders.

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