Die for flat pipe machining

Abstract

The utility model relates to the technical field of flat tube production, in particular to a die for flat tube processing, which comprises an upper stamping die and a lower stamping die, each stamping die comprises a die holder and a die block fixedly mounted on the die holder, the die blocks are defined to extend along the left-right direction, and forming surfaces of the die blocks are wavy curved surfaces and comprise wave crest curved surfaces and wave trough curved surfaces. The wave crest curved surfaces and the wave trough curved surfaces are alternately arranged left and right; the module is internally provided with a plurality of heat conduction cavities extending front and back and used for injecting / discharging fluid, the front end and the rear end of each heat conduction cavity are each provided with a connecting channel used for injecting / discharging the fluid in the corresponding heat conduction cavity, each heat conduction cavity comprises a first cavity wall close to the wave crest curved surface and a second cavity wall close to the corresponding connecting channel, and the first cavity walls and the second cavity walls are both arc-shaped surfaces. The fluctuation trends of the first cavity wall and the wave crest curved surface close to the first cavity wall are consistent; the heat conduction cavity attached to the forming face is formed in the module, heat of fluid in the heat conduction cavity can be evenly transmitted to the forming face of the mold, and therefore the temperature on the forming face is evenly distributed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of flat tube production technology, specifically relates to a mould for flat tube processing. BACKGROUND

[0002] Micro-channel flat tube is a kind of high-efficiency heat exchange element, which is widely used in automobile, air conditioner, wind power energy storage and radiator industry. The working principle of micro-channel flat tube is to use the high heat transfer performance of micro-channel to rapidly reduce or raise the temperature of fluid or external environment. Because the surface area of micro-channel flat tube is much larger than that of traditional pipe, more heat can be transferred in unit time, so that higher heat transfer efficiency can be realized.

[0003] Micro-channel flat tube is often used in the heat dissipation system of new energy battery pack, and the flat tube is extruded into S-shaped structure to wrap each battery, and the refrigerant is introduced into the flat tube, which can improve the overall heat dissipation efficiency of the heat dissipation system. The existing S-shaped flat tube forming mode is generally mold extrusion forming.

[0004] The mold extrusion forming mode is to extrude the metal flat tube through the mold with fixed shape, and the ductility of the metal is used to complete the processing of the metal flat tube with different shapes. In order to avoid the generation of internal stress, the existing pipe stamping operation is generally hot stamping mode, and the pipe needs to be preheated before stamping, and the stamping die also needs to be heated. The existing pipe stamping die generally adopts the mode of built-in electric heating rod to heat the die.

[0005] For example, the Chinese patent application with the application publication number CN103464607A discloses a module slider differential forming stamping die, which comprises a template, a heating module and a cooling module. The heating module is fixed on both sides of the template by bolts respectively. The cooling module is fixed in the middle of the template by bolts respectively. The heating module is provided with a heating rod, which is uniformly heated by the heating rod. The contact surface of the cooling module and the template is provided with water inlet and outlet holes in the longitudinal direction, and the cooling module is provided with a plurality of surface cooling pipelines in its interior along the shape of the working surface. The template is correspondingly provided with water inlet and outlet openings, and the cooling module is cooled by circulating water.

[0006] The above-mentioned mold adopts the mode of built-in heating rod and cooling pipeline to realize the preheating and cooling of different positions of the mold, but the heating rod is easy to cause uneven temperature distribution on the surface of the mold in the long-term use process, and is easy to age or damage, and the stability is poor. The mode of built-in heating pipeline can avoid the defects of the above-mentioned heating mode, and the setting of the cooling pipeline in the above-mentioned mold can obtain corresponding inspiration.

[0007] However, the cooling pipe in the above mold is connected with the mold plate and the cooling module, the water inlet and outlet of the cooling water are located on the mold plate, which has high requirements for the installation precision of the mold plate and the module, and the mold plate will generate a large temperature difference when the heat source or cold source is supplied to the cooling module, and long-term high temperature difference will cause the stability of the mold plate material to deteriorate; in addition, the plurality of cooling pipes and bolt holes are located in the mold plate, and the plurality of holes in the mold plate as a support structure will reduce the structural strength of the mold plate.

[0008] In addition, the surface cooling pipe in the above mold is a linear straight pipe extending along the length direction of the mold, which is inconsistent with the fluctuation trend of the forming surface of the cooling module, and is not conducive to heat transfer, which will cause uneven temperature distribution of the forming surface during use of the mold, and further affect the stamping effect.

[0009] Therefore, a mold is needed, which can ensure the structural strength of the mold plate while making the temperature distribution of the forming surface of the module uniform. Content of the utility model

[0010] The utility model provides a kind of mold for flat tube processing, while ensuring that mold heating temperature is uniformly distributed, ensure the structural strength of the mold plate.

[0011] To solve the above problems, the utility model provides a kind of mold for flat tube processing using the following technical solutions:

[0012] A kind of mold for flat tube processing, including upper and lower two stamping dies, stamping die includes die holder and fixedly installed module on die holder, define module along left and right direction extension, the forming surface of module is wave-shaped curved surface, forming surface includes wave crest curved surface and wave trough curved surface, wave crest curved surface and wave trough curved surface left and right are arranged in sequence;

[0013] Module has a plurality of front and rear extension heat conduction cavities for fluid injection / evacuation, the front and rear ends of heat conduction cavity are provided with connecting channels for injecting / evacuating fluid in heat conduction cavity, heat conduction cavity includes first cavity wall close to wave crest curved surface and second cavity wall close to connecting channel, first cavity wall and second cavity wall are both arc surface, the fluctuation trend of first cavity wall close to wave crest curved surface is consistent with first cavity wall.

[0014] The mold for flat tube processing of the utility model makes the heat of fluid in heat conduction cavity be uniformly transmitted to the forming surface of module by setting heat conduction cavity with consistent fluctuation trend with forming surface in the interior of module, so that the temperature distribution of forming surface is uniform. In addition, compared with the mode of injecting and evacuating fluid from mold plate, fluid is injected / evacuated from front and rear ends of module, which can reduce the number of holes in the interior of mold plate and enhance the structural strength of mold plate. At the same time, it can avoid that the stability of mold plate material deteriorates due to long-term injection and evacuation of fluid with different temperatures.

[0015] Further, the module comprises a plurality of split modules which are left and right abutted, the split module comprises a mold body and a plurality of fluid cavities which are located in the mold body for injecting / discharging fluid, and the heat conduction cavity and the connecting channel jointly constitute the fluid cavity.

[0016] The number of the heat conduction cavities in each fluid cavity is two, and the connecting channel is located between the two heat conduction cavities of the same fluid cavity and communicates with the two adjacent heat conduction cavities.

[0017] Further, the split module further comprises a plurality of plugs which are matched with the heat conduction cavities, each heat conduction cavity penetrates through the mold body in the front-rear direction, and the plugs are installed at the front and rear ends of the heat conduction cavity to close the end of the heat conduction cavity.

[0018] Further, the split module further comprises a pipe joint which is inserted on each connecting channel, the pipe joint is a three-way structure, and is used for connecting the fluid supply device and the fluid cavity.

[0019] Further, the mold base is provided with a plurality of positioning pins on the side close to the module, and the upper end of the upper module and the lower end of the lower module are provided with positioning holes corresponding to each positioning pin, so that the stamping precision of the mold is improved.

[0020] Further, the module further comprises end blocks which are located at the left and right ends of the module, and the end blocks are used for supporting the two end portions of the flat pipe.

[0021] Further, the mold base and the module are fixedly connected through screws.

[0022] The beneficial effects of the mold for flat pipe machining are as follows:

[0023] 1. The mold for flat pipe machining sets the heat conduction cavity which is consistent with the fluctuation trend of the forming surface in the interior of the module, so that the heat of the fluid in the heat conduction cavity can be uniformly transmitted to the forming surface of the module, and the temperature distribution of the forming surface is uniform. In addition, compared with the mode that the fluid is injected and discharged from the mold plate, the fluid is injected and discharged from the front and rear ends of the module, the number of holes in the mold plate can be reduced, and the structural strength of the mold plate is enhanced. At the same time, the stability of the mold plate material can be avoided due to long-time injection and discharge of fluid of different temperatures.

[0024] 2. The split module design makes the length of the mold adjustable, and can be applied to flat pipe stamping operations of different length specifications, and the applicability of the stamping die is improved.

[0025] 3. The front-rear through heat conduction cavity design can significantly reduce the processing difficulty of the heat conduction cavity, and the processing cost of the mold is reduced.

[0026] 4、The positioning hole can improve the positioning accuracy of the module on the die holder, and then can improve the accuracy of the abutment of the molding surface on the adjacent split module, and ensure the molding accuracy of the flat pipe. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A structure schematic view of a die for flat pipe machining is provided in the utility model.

[0028] Figure 2 For Figure 1 A structure schematic view of a middle module.

[0029] Figure 3 For Figure 2 A cooperation schematic view of a split module.

[0030] Figure 4 For Figure 2 A structure schematic view of a split module.

[0031] Figure 5 For Figure 2 A cooperation schematic view of a left upper end block and a left lower end block.

[0032] Figure 6 For Figure 2 A cooperation schematic view of a right upper end block and a right lower end block.

[0033] Figure 7 For Figure 1 A structure schematic view of a support plate.

[0034] Explanation of the reference signs:

[0035] 1, punch die; 2, die holder; 21, support plate; 22, connecting plate; 23, positioning pin; 3, module; 31, split module; 311, die body; 311a, positioning hole; 311b, molding surface; 311c, wave peak curved surface; 311d, wave valley curved surface; 312, fluid cavity; 312a, heat conduction cavity; 312b, connecting channel; 312c, first cavity wall; 312d, second cavity wall; 313, plug block; 314, pipeline joint; 32, end block; 321, left upper end block; 322, right upper end block; 323, left lower end block; 324, right lower end block. DETAILED DESCRIPTION

[0036] The principles and spirits of the utility model will be explained in detail below by referring to several representative embodiments of the utility model.

[0037] Embodiment 1 of the die for flat pipe machining provided in the utility model:

[0038] As Figures 1 to 7As shown, the mold comprises two rows of stamping dies 1 for stamping the flat tube, defining that the stamping dies 1 extend along the left-right direction. The stamping dies 1 comprise a die base 2 and a die block 3, and the die block 3 is fixedly installed on the die base 2.

[0039] Firstly, the die block 3 is introduced below, which comprises a plurality of split die blocks 31 butted left and right and end blocks 32 located at the left and right ends of the die block 3.

[0040] As shown in Figure 3 and Figure 4 , the split die block 31 comprises a die body 311, a fluid cavity 312, a plug 313 and a pipe joint 314. The die body 311 is a rectangular block, and the lower surface of the die body 311 on the upper side and the upper surface of the die body 311 on the lower side are forming surfaces 311b. The forming surface 311b is a wavy curved surface, and the forming surface 311b comprises wave crest curved surfaces 311c and wave trough curved surfaces 311d, which are arranged alternately left and right, and the forming surfaces 311b of the adjacent die bodies 311 above and below are matched with each other to stamp the flat tube into a certain shape.

[0041] The fluid cavity 312 is located in the die body 311, and the number of fluid cavities 312 in each die body 311 is four, which are used for fluid injection / exhaust, and each fluid cavity 312 comprises two front and rear extending heat conducting cavities 312a and two connecting channels 312b located at the front and rear ends of the die body 311.

[0042] As shown in Figure 3 and Figure 4 , the heat conducting cavity 312a is an arc-shaped cavity which is matched with the forming surface 311b, and it penetrates through the die body 311 along the front and rear direction to reduce the processing difficulty of the heat conducting cavity 312a. The connecting channel 312b is located between the corresponding two heat conducting cavities 312a, one end of which communicates with the two heat conducting cavities 312a, and the other end forms a jack on the die body 311. The heat conducting cavity 312a comprises a first cavity wall 312c close to the wave crest curved surface 311c and a second cavity wall 312d close to the connecting channel 312b, and the first cavity wall 312c and the second cavity wall 312d are both arc-shaped surfaces, and the first cavity wall 312c is consistent with the fluctuation trend of the wave crest curved surface 311c close to it, so that the heat of the fluid in the heat conducting cavity 312a is uniformly transmitted to the forming surface 311b. The plug 313 is an arc-shaped block matched with the heat conducting cavity 312a, which is fixedly installed at the front and rear ends of each heat conducting cavity 312a to close the end of each heat conducting cavity 312a. The pipe joint 314 is a three-way connecting pipe, and the number of pipe joints 314 is consistent with the number of connecting channels 312b, which is inserted into each jack to communicate the fluid cavity 312 with the fluid supply equipment. In this embodiment, the fluid supply equipment is a steam generator.

[0043] As shown in Figure 2 ,Figure 5 and Figure 6 As shown in Figs. 1 and 2, the end block 32 includes a left upper end block 321 located at the left end of the upper row of the modules 3, a left lower end block 323 located at the left end of the lower row of the modules 3, a right upper end block 322 located at the right end of the upper row of the modules 3, and a right lower end block 324 located at the right end of the lower row of the modules 3. The forming surface 311b of each end block 32 is smoothly connected with the forming surface 311b of the adjacent split module 31. The left end of the forming surface 311b of the left upper end block 321 and the left lower end block 323 and the right end of the forming surface 311b of the right upper end block 322 and the right lower end block 324 are horizontal surfaces, so as to support the two ends of the flat tube during the stamping of the flat tube and keep the ends of the flat tube in a straight line during the stamping.

[0044] The die holder 2 will be described below. As shown in Figs. 3 and 4, Figure 1 and Figure 7 The die holder 2 includes a support plate 21 for supporting and fixing each split module 31 and a connecting plate 22 located between two support plates 21 for connecting the two adjacent support plates 21. The lower end of the upper support plate 21 and the upper end of the lower support plate 21 each have a plurality of left and right arranged positioning pins 23. The split module 311 is provided with a positioning hole 311a corresponding to the positioning pin 23 on the contact surface of the support plate 21. Each split module 31 is accurately fixed on the support plate 21 through the cooperation of the positioning hole 311a and the positioning pin 23, so as to improve the stamping precision of the die.

[0045] The working principle of the die is as follows:

[0046] The flat tube is stamped and formed under the stamping action of the forming surface 311b of the upper and lower rows of the stamping dies 1. Before and during the stamping, steam is introduced into each split module 31. Since the first cavity wall 312c of the heat conduction cavity 312a is consistent with the undulating trend of the forming surface 311b of the split module 31, the heat of the steam can be uniformly transferred to the forming surface 311b through the heat conduction cavity 312a, so as to uniformly preheat the module 3 and the flat tube.

[0047] In other embodiments, when the strength of the die body 311 meets the stamping condition, the fluid cavity 312 includes one or three heat conduction cavities 312a abutting the forming surface 311b, so as to avoid that the structural strength of the forming surface 311b is reduced due to the excessive volume of the heat conduction cavity 312a.

[0048] According to the above description of the present specification, those skilled in the art can also understand that the terms used such as "upper", "lower", "front", "rear", "left", "right", "width", "horizontal", "top", "bottom", "inner", "outer" and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings of the present specification, which are only for the purpose of facilitating the description of the scheme of the present application and simplifying the description, and are not explicitly or implicitly indicated that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation, therefore the above orientation or positional relationship terms cannot be understood or interpreted as a limitation on the scheme of the present application.

[0049] In addition, in the description of the present specification, the meaning of "a plurality of" is at least two, such as two, three or more, etc., unless otherwise explicitly and specifically limited.

Claims

1. A mold for flat tube processing, comprising an upper and lower stamping die, the stamping die comprising a die base and a die block fixedly installed on the die base, the die block extending in a left-right direction, characterized in that: the forming surface of the die block is a wavy curved surface, the forming surface comprising wave crest curved surfaces and wave trough curved surfaces, the wave crest curved surfaces and the wave trough curved surfaces being arranged alternately in the left-right direction; the die block has a plurality of front-rear extending heat conduction cavities for injecting / discharging fluid, the heat conduction cavities each having a connecting channel at the front and rear ends thereof for injecting / discharging fluid into / out of the heat conduction cavities, the heat conduction cavities comprising a first cavity wall close to the wave crest curved surface and a second cavity wall close to the connecting channel, the first cavity wall and the second cavity wall each being an arc surface, the first cavity wall having the same undulating trend as the wave crest curved surface close to the first cavity wall.

2. The die for flat tube processing according to claim 1, wherein the die block comprises a plurality of split die blocks that are butted together in the left-right direction, each of the split die blocks comprising a die body and a plurality of fluid cavities in the die body for injecting / discharging fluid, the heat conduction cavities and the connecting channels together forming the fluid cavities; the number of heat conduction cavities in each of the fluid cavities is two, and the connecting channel is located between the two heat conduction cavities of the same fluid cavity and communicates with the adjacent two heat conduction cavities.

3. A die for processing a flat tube according to claim 2, wherein the split die block further comprises a plurality of plugs that are matched with the heat conduction cavities, each of the heat conduction cavities extending through the die body in the front-rear direction, and the plugs being installed at the front and rear ends of the heat conduction cavities to close the ends of the heat conduction cavities.

4. The die for processing a flat tube according to claim 3, wherein the split die block further comprises a pipe joint inserted into each of the connecting channels, the pipe joint being a tee structure and being used to connect a fluid supply device and the fluid cavities.

5. The die for flat tube processing according to claim 1, wherein the die base has a plurality of positioning pins on the side close to the die block, and the upper end of the upper die block and the lower end of the lower die block each have a positioning hole corresponding to each of the positioning pins, so as to improve the stamping precision of the mold.

6. The die for flat tube processing according to claim 1, wherein the die block further comprises end blocks at the left and right ends of the die block, the end blocks being used to support the two ends of the flat tube.

7. A die for flat tube processing according to claim 6, wherein the die base and the die block are fixedly connected by screws.

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