Secondary machining method for high-suspension thin-sheet-type heat dissipation tooth sheet

Abstract

The invention discloses a secondary machining method for a high-suspension thin-sheet-type heat dissipation tooth sheet. The secondary machining method comprises the steps that plunge milling is conducted through a plunge milling cutter; wherein the feeding direction of the plunge milling cutter is the growth direction of the tooth pieces, and plunge milling is conducted from the tops of the tooth pieces to the roots of the tooth pieces; therefore, in the plunge milling machining process, along with feeding of the plunge milling cutter, the overhanging height of the plunge milling part on the tooth piece is gradually reduced, the rigidity of the tooth piece is increased, and deformation of the tooth piece is gradually reduced; meanwhile, plunge milling is conducted in the growth direction of the tooth pieces, so that radial cutting force acting on a milling machine and the radiator tooth pieces can be reduced, and deformation of the tooth pieces can also be reduced; compared with a traditional radial milling machining mode, the plunge milling machining method can guarantee that the radiator tooth pieces are not prone to deformation in the secondary machining process while the machining aging is guaranteed, and the machining efficiency of radiator products is improved.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and more specifically, to a secondary machining method for a high-suspension thin-plate heat dissipation tooth. Background Technology

[0002] In the heat sink of the power amplifier module, after the heat sink fins are initially formed by processes such as extrusion, toothing, or drawing, the surface of the heat sink fins needs to undergo secondary processing to obtain a qualified finished heat sink; refer to Figure 1 In the relevant existing technologies, such heat dissipation fins are mostly processed by end milling. The axis of the milling cutter is parallel to the width direction of a single set of fins. During the high-speed rotation of the milling cutter, the milling cutter feeds along the thickness direction of the fins. During the process, the end edge and side edge of the milling cutter process the surface of the fins, which will generate a certain pressure and impact on the surface of the fins.

[0003] When the heat sink fins are high-suspended thin-walled structures (i.e., the fins are thin and have a large height along the growth direction), the fins are more susceptible to deformation and breakage due to stress and vibration during processing, which can lead to product defects or even scrap. To overcome this problem, in actual processing, it is necessary to reduce parameters such as the feed rate of radial milling, which in turn affects the efficiency of secondary processing of the heat sink fins. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings mentioned in the background art and provide a secondary processing method for high-suspension thin-plate heat dissipation fins, so as to simultaneously improve the secondary processing efficiency and forming quality of heat dissipation fins.

[0005] The objective of this invention is achieved through the following technical solution: A secondary machining method for a high-suspension thin-plate heat dissipation fin involves using a plunger for plunge milling. The feed direction of the insert milling cutter is the growth direction of the toothed plate, and it inserts and mills from the top of the toothed plate to the root of the toothed plate.

[0006] The secondary processing method for the high-suspension thin-plate heat dissipation fins of the present invention has at least the following beneficial effects: During the plunge milling process, as the plunge milling cutter feeds, the overhang height of the plunge milled portion on the tooth plate gradually decreases, the rigidity of the tooth plate increases, and the deformation of the tooth plate gradually decreases. At the same time, plunge milling along the growth direction of the tooth plate can reduce the radial cutting force acting on the milling machine and the radiator tooth plate, and can also reduce the deformation of the tooth plate. Compared with the traditional radial milling machining method, the plunge milling machining method of the present invention can ensure machining efficiency while ensuring that the radiator tooth plate is not easily deformed in secondary machining, thereby improving the machining efficiency of radiator products.

[0007] Furthermore, the cutter uses climb milling to machine the gear teeth. During climb milling, the cutting thickness of the gear teeth gradually decreases, which helps to reduce gear tooth deformation and extend the service life of the cutter.

[0008] Furthermore, the diameter of the plunger is at least 2.5 times the thickness of the tooth plate, ensuring that the center of the plunger is offset from the heat dissipation tooth plate by a sufficient distance, and also ensuring that the plunger can process a set of tooth plates in one pass.

[0009] Furthermore, the radius of the milling cutter is not less than three times the thickness of the tooth plate.

[0010] Furthermore, when the thickness of the toothed plate is 1 mm, the overhang is 60 mm, and the interval between two adjacent sets of toothed plates is 5 mm; The diameter of the end mill is 6 mm, and the rotation speed is 3000 r / min to 7000 r / min.

[0011] Furthermore, the axial feed rate of the end face of the plunger is 500 mm / min, and the radial feed is 10% of the plunger diameter.

[0012] Furthermore, the axial depth of cut of the side cutting edge of the end mill is 16mm, and the radial feed rate is 1200mm / min.

[0013] Furthermore, the radial step distance between two adjacent milling operations of the plunger is 1.5 mm.

[0014] Optionally, during the milling process from the top of the gear to the root of the gear, the feed rate of the milling cutter can also be gradually increased. This is because the overhang height of the milled part on the gear gradually decreases, and the rigidity of the gear increases, making it less prone to deformation.

[0015] Furthermore, segmented milling along the top to the root of the toothed plate by the plunger can effectively avoid problems such as plunger overload and poor chip removal.

[0016] Furthermore, after the single set of gear teeth has been milled, a fine milling can be performed once using a milling cutter with low feed parameters and high speed to remove the step marks left on the gear teeth surface after milling and improve the surface finish of the gear teeth.

[0017] Preferably, a support fixture can also be provided on the back side of the gear plate's machining surface. During the milling process, the support fixture presses against the gear plate from the back side to provide mechanical support, further reducing the vibration and deformation of the gear plate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram illustrating the processing method of heat dissipation fins in the prior art. Figure 2 A schematic diagram illustrating the processing method of the high-suspension thin-plate heat dissipation tooth provided by the present invention; Figure 3This is a schematic diagram of the reverse milling machining principle provided in an embodiment of the present invention; Figure 4 A schematic diagram of the climb milling process provided in an embodiment of the present invention; The attached diagram lists the components represented by each number as follows: 1-Radiator, 2-Gear plate, 3-End mill, 4-Face mill. Detailed Implementation

[0019] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0020] Reference Figure 1 In the prior art, when processing the toothed plate 2 of the radiator 1 in the secondary processing, the face milling cutter 4 is mostly used to mill the end face of the toothed plate 2. The force applied by the face milling cutter 4 to the radial direction of the toothed plate 2 is easy to cause the toothed plate 2 to vibrate and deform. Therefore, the above processing method can only be applied to processing scenarios where the toothed plate is thick and the overhang is low.

[0021] When the toothed fins 2 of the radiator 1 to be processed have a high overhang and a thin thickness in the growth direction, such as a toothed fin overhang of 60mm or more and a maximum wall thickness of 1mm, in the actual processing experiment, it was found that using the aforementioned end milling method would result in a product scrap rate of over 40%. If the feed rate and speed of the face milling cutter 4 are reduced, the product scrap rate can be reduced to a certain extent, but it will greatly reduce the secondary processing efficiency of the toothed fins 2 of the radiator 1 and affect product delivery.

[0022] Based on the above reasons, the present invention provides a secondary processing method suitable for high-suspended thin-plate heat dissipation fins, which uses a plunger 3 to plunge-mill the fins 2 of the heat sink 1.

[0023] Reference Figure 2 In this process, the feed direction of the plunger 3 is the growth direction of the toothed piece 2. During the plunge milling process, the plunger 3 plunges from the top of the toothed piece 2 to the root of the toothed piece 2.

[0024] Therefore, during the milling process of each set of toothed plates 2, as the milling cutter 3 feeds towards the tooth root, the overhang height of the milled portion on the toothed plate 2 gradually decreases, the rigidity of the toothed plate 2 increases, and the deformation of the toothed plate 2 gradually decreases; at the same time, compared to Figure 1 The end milling method shown in this invention, which involves milling along the growth direction of the toothed plate 2, can reduce the radial cutting force acting on the milling machine and the toothed plate 2 of the radiator 1, and can also reduce the deformation of the toothed plate 2 in the radial cutting force direction. While ensuring processing efficiency, it can also ensure that the toothed plate 2 of the radiator 1 is not easily deformed in secondary processing, thereby improving the processing efficiency of the radiator 1 product.

[0025] Reference Figure 3In one embodiment, the milling cutter 3 can perform secondary machining on the surface of the toothed plate 2 using reverse milling. During this process, the rotation direction of the milling cutter 3 is opposite to the feed direction of the toothed plate 2. During the machining process, the cutting thickness of the milling cutter 3 will gradually increase, which will also cause vibration and deformation of the toothed plate 2 to a certain extent. However, compared with end milling, it can still reduce the deformation of the toothed plate 2 better.

[0026] Reference Figure 4 In a more preferred embodiment, the milling cutter 3 uses climb milling to process the toothed plate 2. During climb milling, the cutting thickness on the toothed plate 2 gradually decreases, which helps to reduce the deformation of the toothed plate 2 and improve the service life of the milling cutter 3.

[0027] Based on the selection of the plunger 3 and cutting parameters and the programming strategy, the structure of the toothed plate 2 of the radiator 1 is analyzed. The spacing between adjacent toothed plates 2 is also very small, usually 5mm to 10mm. During plunge milling, it is necessary to ensure that only one set of toothed plates 2 is milled in one pass, so the diameter of the plunger 3 cannot be too large. In addition, it is also necessary to ensure that the center of the plunger 3 is offset from the toothed plate 2 by a certain distance, so the diameter of the plunger 3 cannot be less than 2.5 times the thickness of the toothed plate 2.

[0028] Preferably, the radius of the milling cutter 3 is not less than three times the thickness of the toothed plate 2.

[0029] For example, when the thickness of each set of toothed plates 2 is 1 mm, the overhang is 60 mm, and the interval between two adjacent sets of toothed plates 2 is 5 mm, the diameter of the selected milling cutter 3 is 6 mm, and the rotation speed is 3000 r / min to 7000 r / min.

[0030] The end edge of the plunger 3 has an axial feed rate of 500 mm / min and a radial feed rate of 10% of the plunger diameter, i.e., a radial feed rate of 0.6 mm. In addition, the side edge of the plunger 3 has an axial depth of cut of 16 mm and a radial feed rate of 1200 mm / min.

[0031] When the insert milling cutter 3 inserts a single set of toothed pieces 2, the insert milling cutter 3 inserts from the top of the toothed piece 2 to the root of the toothed piece 2 to complete one insert milling action, and then retracts to the top of the toothed piece 2; then the insert milling cutter 3 moves 1.5mm along the width direction of the toothed piece 2 to perform the next insert milling action, that is, the radial step distance of the insert milling cutter 3 is 1.5mm.

[0032] When the above-mentioned milling method is used to perform secondary processing on the toothed plates 2 of the radiator 1, according to statistics, the product scrap rate can be reduced from 40% to 3%. At the same time, the secondary processing time of the toothed plates 2 of a single radiator 1 is also reduced from 13 hours required by end milling to 5 hours, which greatly improves the processing efficiency of the product.

[0033] Furthermore, in some embodiments, as the milling cutter 3 feeds from the top of the toothed plate 2 to the root of the toothed plate 2, the overhang height of the milling portion on the toothed plate 2 gradually decreases, and the rigidity of the toothed plate 2 gradually increases and it is not easily deformed. Therefore, during the milling process from the top of the toothed plate 2 to the root of the toothed plate 2, the feed speed of the milling cutter 3 can also gradually increase. For example, it can be gradually increased from 3000 r / min to 7000 r / min.

[0034] In some embodiments, to avoid overload and poor chip removal of the plunger 3, the plunger 3 can also perform plunge milling in sections from the top of the toothed plate 2 to the root of the toothed plate 2 until it is fed to the root of the toothed plate 2.

[0035] In some embodiments, after the single set of toothed plates 2 has been milled, the milling cutter 3 can be used to finish mill once with low feed parameters and high speed to remove the step marks left on the surface of the toothed plates 2 after milling and improve the surface finish of the toothed plates.

[0036] In addition, to further reduce the deformation of the toothed plate 2 during the machining process, in some embodiments, a support fixture can be provided on the back side of the machining surface of the toothed plate 2. During the milling process, the support fixture presses against the toothed plate 2 from the back side to provide mechanical support.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A secondary processing method for a high-suspension thin-plate heat dissipation fin, characterized in that, The secondary machining method uses a plunge milling cutter for plunge milling. The feed direction of the milling cutter is the growth direction of the toothed plate, and it mills from the top of the toothed plate to the root of the toothed plate.

2. The secondary processing method for the high-suspension thin-plate heat dissipation fins according to claim 1, characterized in that, The milling cutter is used to machine the gear plate by climb milling.

3. The secondary processing method for the high-suspension thin-plate heat dissipation fins according to claim 2, characterized in that, The diameter of the milling cutter is at least 2.5 times the thickness of the toothed plate.

4. The secondary processing method for the high-suspension thin-plate heat dissipation fins according to claim 3, characterized in that, The radius of the milling cutter is not less than three times the thickness of the toothed plate.

5. The secondary processing method for the high-suspension thin-plate heat dissipation fins according to claim 3 or 4, characterized in that, When the thickness of the toothed plate is 1mm, the overhang is 60mm, and the interval between two adjacent sets of toothed plates is 5mm; The milling cutter has a diameter of 6 mm and a rotational speed of 3000 r / min to 7000 r / min.

6. The secondary processing method for the high-suspension thin-plate heat dissipation fins according to claim 5, characterized in that, The axial feed rate of the end face of the plunger is 500 mm / min, and the radial feed is 10% of the diameter of the plunger.

7. The secondary processing method for the high-suspension thin-plate heat dissipation fins according to claim 5, characterized in that, The side cutting edge of the end mill has an axial depth of cut of 16 mm and a radial feed rate of 1200 mm / min.

8. The secondary processing method for the high-suspension thin-plate heat dissipation fins according to claim 5, characterized in that, The radial step distance between two consecutive milling operations of the milling cutter is 1.5 mm.

9. The secondary processing method for the high-suspension thin-plate heat dissipation fins according to claim 2, characterized in that, During the milling process from the top of the toothed plate to the root of the toothed plate, the feed rate of the milling cutter gradually increases.

10. The secondary processing method for the high-suspension thin-plate heat dissipation fins according to claim 2, characterized in that, The milling cutter mills in sections from the top of the toothed plate to the root of the toothed plate.

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