Fin hot stamping and forging machine

Abstract

The utility model discloses a hot stamping forging fin machine which comprises a machine frame body, an upper sliding table, a lower sliding table, a cam device, a horizontal sliding table and a fin die, the fin die comprises a base, a die body, a first electric heating tube, a front stamping forging head, a rear stamping forging head, an anvil stripping plate and a baffle, and the position corresponding to the front stamping forging head forms a primary forming forging position. A post-forging forming forging position is formed by the positions corresponding to the punching forging head and the anvil stripping plate at the rear position; and the preheating material guide device is arranged at the front end of the fin mold. The scheme is mainly used for manufacturing high-pressure fins, the thickness of the top can be reduced through forging, the initially-formed arc-shaped tooth upset is forged into a flat top, meanwhile, the radius of the outer edge arc is greatly reduced, brazing is facilitated, stress concentration is reduced, the needed amount of brazing filler metal is reduced, bubbles generated by the brazing filler metal are reduced / avoided, the brazing quality is stabilized, and therefore the fins with the high duty ratio are manufactured; therefore, corresponding technical support can be provided for the plate-fin heat exchanger to bear high pressure.

Description

Technical Field

[0001] The utility model relates to the technical field of forming and processing fins in a plate-fin heat exchanger, in particular to a hot stamping and forging fin machine. Background Art

[0002] Plate-fin heat exchanger is a heat exchanger with high heat transfer efficiency, small size and light weight. At present, plate-fin heat exchanger is widely used in various oil, water and gas heating and / or cooling in engineering machinery, general machinery, internal combustion locomotive and other departments. For example: aluminum plate-fin heat exchanger is widely used in heat exchangers of air separation equipment; ethylene unit, synthetic ammonia unit, natural gas liquefaction (LNG) and separation unit in petrochemical industry; used in cryogenic hydrogen, helium, refrigeration and liquefaction equipment; used in refrigeration and air conditioning fields; used in automobile and aviation industries.

[0003] In the aluminum plate-fin heat exchanger structure, the fin is the heat exchange element, and the conventional punched fin shape is as shown in the attached Fig.10 As shown in the figure, in the aluminum plate-fin heat exchanger structure, the fin material is generally made of aluminum-magnesium alloy foil, and currently the fin punching machine is generally used for punching. The traditional punching machine structure and components are shown in the attached Figure 1 , Attachment Figure 2 Specifically, it includes a frame body 1, an upper casing 2, an upper slide 3, an upper die connecting rod 4, a shaping table 5, a feed rocker 6, a lower slide 7, a rocker arm 8, an electric control box 9, a spindle box 10, a cam device 11, a gearbox 12, a motor 13, an oil pump device 14, a clutch 15, a lubricating oil distributor 16, a horizontal slide 19 and other components. The motor 13 outputs power, which is converted and transmitted to the spindle box 10 through the gearbox 12. The spindle box 10 drives the cam device 11 to rotate. The two sets of eccentric cams on the cam device 11 respectively drive the upper slide 3 and the lower slide 7 to move up and down through the upper die connecting rod 4, and drive the horizontal slide 19 to move horizontally through the feed rocker 6, so that the aluminum foil is stamped and formed by the stamping dies on the upper slide 3 and the lower slide 7.

[0004] Since conventional punched fins are all cold-worked, they are constrained by the cold plasticity of the material, and the bending radius cannot be too small. For aluminum alloy 3003, its bending radius cannot be less than 0.5t (t is the thickness of the aluminum foil). This limits the fin material duty cycle (fin thickness / pitch) to no more than 50%, which also limits the application pressure (pressure) of the fin to no more than 1 / 4 of its strength limit. In addition, due to the increase in the amount of brazing filler metal, the brazing seam is prone to defects such as slag inclusions and pores, which often causes the broken parts to be pulled apart on the brazing seam. Fig.9A , Fig. 9B and Fig. 9C shown.

[0005] In view of this, how to solve the problem of limiting the application pressure strength of the fins in the existing conventional punching fin technology has become a topic to be studied and solved by the present utility model. Utility Model Content

[0006] The utility model aims to provide a hot stamping forging fin machine used for hot stamping forging of fins in a plate-fin heat exchanger, so as to improve the plasticity of the material and be able to perform hot stamping forging on aluminum foil.

[0007] In order to achieve the above-mentioned purpose, the utility model proposes a hot stamping forging fin machine, which is used for the hot stamping forging of fins in a plate-fin heat exchanger. The hot stamping forging fin machine includes a frame, an upper casing, an upper slide, upper and lower die connecting rods, a shaping table, a feeding rocker, a lower slide, a cam device, and a fin die. The cam device is connected to one of the upper slide or the lower slide through the upper and lower die connecting rods. The fin die is arranged on the upper slide and the lower slide. The innovation is:

[0008] The fin die comprises a base, a die body, a first electric heating tube, a punching head, an anvil stripping plate, and a baffle. The base is mounted on an upper slide and a lower slide. The die body is fixed on the base. The die body is provided with a first electric heating tube. The punching head, anvil stripping plate, and baffle are arranged on the die body. The position corresponding to the punching head located in the front position constitutes a preliminary forming forging position. The positions corresponding to the punching head and anvil stripping plate located in the rear position constitute a post-forging forming forging position. The post-forging forming forging position is arranged between the punching head and the baffle.

[0009] The hot stamping and forging fin machine also includes a preheating material guide arranged at the front end of the fin die, the preheating material guide is provided with a second electric heating tube, the preheating material guide is used to preheat and guide the aluminum foil, and the cam device is provided with a material guiding cam, which is connected to the preheating material guide through a material guiding connecting rod and drives the preheating material guide to move synchronously.

[0010] The relevant contents of this utility model are explained as follows:

[0011] 1. The working principle of the above technical scheme of the utility model is as follows: the fin mold has a heat preservation and heating function, the preheating guide heats the aluminum foil, and performs preliminary forging with the cooperation of the punching head in the front position to achieve the preliminary forming of a tooth. At this time, the tooth top is in an arc shape, and the punching head in the front position, the anvil stripping plate, the baffle plate and the punching head in the rear position cooperate to perform another punching forging to achieve post-forging forming, thin the top thickness of the tooth, and forge the preliminary formed arc-shaped tooth top into a flat top. At the same time, the outer edge arc radius is greatly reduced, which is convenient for brazing, reduces stress concentration, reduces the amount of brazing material required, reduces / avoids the generation of bubbles in the brazing material, and stabilizes the brazing quality. This scheme can improve the plasticity of the material, perform hot forging operations on the aluminum foil, and then stabilize the fin brazing quality and improve the application pressure strength of the fin.

[0012] 2. In the above technical solution, a heat insulating pad is arranged between the mold body and the base to avoid energy loss caused by heat from the mold body being transferred to the base.

[0013] 3. In the above technical solution, a heat-insulating cover is provided on the outside of the mold body to ensure that the heat of the mold body will not be dissipated so easily, thereby saving energy and reducing consumption.

[0014] 4. In the above technical solution, the punching head, anvil stripping plate and baffle are fixed to the die body by a pressing plate, which is convenient for installation, adjustment, maintenance and repair, as well as subsequent replacement of punching heads, anvil stripping plates and baffles of different specifications.

[0015] 5. In the above technical solution, four second electric heating tubes are respectively arranged on the upper and lower sides of the preheating guide, and each second electric heating tube is arranged along the horizontal forward direction of the aluminum foil, so that the aluminum foil can be fully preheated in the preheating guide, so that the material plasticity of the aluminum foil is improved, and the aluminum foil sent to the initial forming forging position and the post-forging forming forging position by the preheating guide can be well hot stamped and forged.

[0016] 6. In the above technical solution, a spring assembly for stripping is connected to the bottom of the anvil stripping plate, and the stripping assembly cooperates with the anvil stripping plate to strip the hot-forged aluminum foil. When the anvil stripping plate is in the front position, the spring pushes the stripping, and when the anvil stripping plate is in the rear position, the spring is compressed and there is no stripping action.

[0017] 7. In this utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0018] 8. In the present utility model, the orientation or position relationship indicated by the terms "center", "upper", "lower", "axial", "bottom", "inner", "outer", etc. is based on the orientation or position assembly relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0019] 9. In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0020] Due to the application of the above scheme, the utility model has the following advantages and effects compared with the prior art:

[0021] In the hot stamping forging fin machine of the utility model, in view of the problem that the conventional stamping fin adopts cold working process and is subject to the cold plastic constraint of the material, resulting in low application pressure of the plate-fin heat exchanger, a hot stamping forging fin machine that can adopt hot forming process to improve the plasticity of the material is designed. The hot stamping forging fin machine is mainly used for high-pressure (material duty cycle ≥ 50%) fin manufacturing, and can forge the top thickness to be thin, and forge the initially formed arc-shaped tooth top into a flat top. At the same time, the outer edge arc radius is greatly reduced, which is convenient for brazing, reduces stress concentration, reduces the amount of brazing material required, reduces / avoids the generation of bubbles in the brazing material, and stabilizes the brazing quality, thereby manufacturing fins with a high duty cycle, thereby being able to provide corresponding technical support for the plate-fin heat exchanger to withstand high pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a simplified diagram of the structure of a traditional fin punch press (view one);

[0023] Figure 2 This is a simplified diagram of the structure of a traditional fin punch press (viewpoint 2);

[0024] Figure 3 This is a schematic structural diagram of a hot stamping and forging fin machine according to an embodiment of the utility model;

[0025] Figure 4 It is a partial schematic diagram of the punching and forging section of an embodiment of the utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the fin mold in the embodiment of the utility model;

[0027] Figure 6 This is a schematic diagram of the structure of the fin mold in the embodiment of the utility model;

[0028] Fig. 7A , Figure 7B It is a schematic diagram of the cooperation between the anvil stripping plate and the spring assembly in the embodiment of the utility model;

[0029] Figure 8 It is a punching and forging step and effect diagram of an embodiment of the utility model;

[0030] 9A to 9CA schematic diagram of bubbles in the solder of a product using the existing cold punching process;

[0031] Fig.10 This is an enlarged view of a cold-punched fin using an existing cold-punching process;

[0032] Fig.11 It is an enlarged view of the punch forging fins using the hot punch forging fin machine of the utility model.

[0033] The various parts of the above drawings are shown as follows:

[0034] 1. Frame body;

[0035] 2. Upper casing;

[0036] 3. Go up the sliding platform;

[0037] 4. Upper and lower mold connecting rods;

[0038] 5. Plastic surgery table;

[0039] 6. Feed the rocker;

[0040] 7. Go down the slide;

[0041] 8. Rocker arm;

[0042] 9. Electric control box;

[0043] 10. Spindle box;

[0044] 11. Cam device;

[0045] 111, material guide cam;

[0046] 12. Gearbox;

[0047] 13. Electric motor;

[0048] 14. Oil pump device;

[0049] 15. Clutch;

[0050] 16. Lubricating oil distributor;

[0051] 17. Fin mold;

[0052] 171. Base;

[0053] 172. Mould body;

[0054] 1721, thermal insulation cover;

[0055] 173, the first electric heating tube;

[0056] 174, punch forging head;

[0057] 175. Punch forging head;

[0058] 176. Take off the anvil;

[0059] 1761, spring assembly;

[0060] 178, baffle;

[0061] 179. Insulation pad;

[0062] 18. Preheating guide;

[0063] 181, second electric heating tube;

[0064] 19. Horizontal slide table;

[0065] 900. Fins. DETAILED DESCRIPTION

[0066] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0067] like Figure 3 , Figure 4 As shown, the embodiment of the utility model proposes a hot stamping forging fin machine, which is used for the hot stamping forging of fins in a plate-fin heat exchanger. The hot stamping forging fin machine includes a frame 1, an upper casing 2, an upper slide 3, upper and lower die connecting rods 4, a shaping table 5, a feeding rocker 6, a lower slide 7, a cam device 11, a horizontal slide 19, and a fin die 17. The cam device 11 is connected to one of the upper slide 3 or the lower slide 7 through the upper and lower die connecting rods 4, and the cam device 11 is connected to the water through the feeding rocker 6. The hot stamping forging fin further comprises a preheating material guide 18 disposed at the front end of the fin die 17, and a second electric heating tube 181 is disposed on the preheating material guide 18. The preheating material guide 18 preheats and guides the aluminum foil. A material guide cam 111 is disposed on the cam device 11. The material guide cam 111 is connected to the preheating material guide 18 through a material guide connecting rod and drives the preheating material guide 18 to move synchronously.

[0068] like Figure 5 , Figure 6As shown, in the hot stamping and forging fin machine of the embodiment of the utility model, the fin mold 17 includes a base 171, a mold body 172, a first electric heating tube 173, punching heads 174, 175, an anvil release plate 176, and a baffle 178. The punching heads 174, 175 are divided into a punching head 174 located in the front position and a punching head 175 located in the rear position (the front position and rear position here refer to the punching head being in the front or in the rear, and the front and rear positions of the same punching head are alternately changed), the base 171 is installed on the upper slide 3 and the lower slide 7, the mold body 172 is fixed on the base 171, the mold body 172 is provided with a first electric heating tube 173, and the punching head, anvil release plate 176, and baffle 178 are arranged on the mold body 172. Figure 6 As shown, the position corresponding to the punching head 174 located in the front position constitutes the preliminary forming forging position, and the position corresponding to the punching head 175 and the anvil stripper plate 176 located in the rear position constitutes the post-forging forming forging position, and the post-forging forming forging position is arranged between the punching head 175 located in the rear position and the baffle 178.

[0069] The above-mentioned improvements are compared with the original fin punching machine. The original machine removes the front half of the stripping plate, adds a preheating guide 18, adds an electric heating tube and an insulation pad 179 to the fin punching die, adds a cam to the camshaft, and adds a corresponding connecting rod to drive the preheating guide 18 to move synchronously. The punching knife is changed to a punching forging head 174, 175, and an anvil stripping plate 176 and a baffle 178 are added to realize forging.

[0070] The working principle of the embodiment of the utility model is as follows:

[0071] First, the fin die 17 has a heat preservation and heating function, the preheating guide 18 heats the aluminum foil, and the front punching and forging heads 174 and 175 cooperate to realize the preliminary forming of a tooth. At this time, the tooth top is in an arc shape. The punching and forging is realized by the cooperation between the punching and forging heads, the anvil stripping plate 176, and the baffle 178. The thickness of the top of the tooth is forged thin, and the initially formed arc-shaped tooth top is forged into a flat top. At the same time, the outer edge arc radius is greatly reduced. The punching and forging fins of the hot punching and forging fin machine of the utility model are shown in FIG. Fig.11 shown.

[0072] In the embodiment of the present invention, a heat insulating pad 179 is disposed between the mold body 172 and the base 171 , thereby preventing the heat on the mold body 172 from being transferred to the base 171 .

[0073] In the embodiment of the present invention, a heat-insulating cover 1721 is provided on the outer side of the mold body 172 to ensure that the heat of the mold body 172 will not be dissipated so easily, thereby saving energy and reducing consumption.

[0074] In the embodiment of the utility model, the punching head, anvil stripper plate 176 and baffle plate 178 are fixed to the die body 172 by a pressure plate, which is convenient for installation, adjustment, maintenance and subsequent replacement of punching heads, anvil stripper plate 176 and baffle plate 178 of different specifications.

[0075] In the embodiment of the present utility model, Figure 3 , Figure 4 As shown, four second electric heating tubes 181 are respectively arranged on the upper and lower sides of the preheating guide 18, and each second electric heating tube 181 is arranged along the horizontal forward direction of the aluminum foil, so that the aluminum foil can be fully preheated in the preheating guide 18, so that the material plasticity of the aluminum foil is improved, and the aluminum foil sent to the initial forming forging position and the post-forging forming forging position by the preheating guide 18 can be well hot stamped.

[0076] In the embodiment of the present utility model, Fig. 7A , Figure 7B As shown, a spring assembly 1761 for stripping is connected to the bottom of the anvil stripping plate 176, and the stripping assembly cooperates with the anvil stripping plate 176 to strip the hot-stamped aluminum foil. When the anvil stripping plate 176 is in the front position, the spring pushes the stripping, and when the anvil stripping plate 176 is in the rear position, the spring is compressed and there is no stripping action.

[0077] Through the implementation of the embodiments of the utility model, in order to solve the problem that conventional stamping fins adopt cold working process and are subject to cold plastic constraints of materials, resulting in low application pressure of plate-fin heat exchangers, a hot stamping forging fin machine that can adopt hot forming process to improve material plasticity is designed. The hot stamping forging fin machine is mainly used for high-pressure (material duty cycle ≥ 50%) fin manufacturing, and can forge the top thickness to be thin, and forge the initially formed arc-shaped tooth top into a flat top. At the same time, the outer edge arc radius is greatly reduced, which is convenient for brazing, reduces stress concentration, reduces the amount of brazing material required, reduces / avoids the generation of bubbles in the brazing material, and stabilizes the brazing quality, thereby manufacturing fins with a high duty cycle, thereby being able to provide corresponding technical support for the plate-fin heat exchanger to withstand high pressure.

[0078] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A hot stamping forging fin machine, used for hot stamping forging of fins in a plate-fin heat exchanger, the hot stamping forging fin machine comprising a frame, an upper housing, an upper slide, upper and lower die connecting rods, a shaping platform, a feeding rocker, a lower slide, a cam device, and a fin die, wherein the cam device is connected to one of the upper slide or the lower slide through the upper and lower die connecting rods, and the fin die is arranged on the upper slide or the lower slide, and is characterized in that: The fin die comprises a base, a die body, a first electric heating tube, a punching head, an anvil stripping plate, and a baffle. The base is mounted on an upper slide and a lower slide. The die body is fixed on the base. The die body is provided with a first electric heating tube. The punching head, anvil stripping plate, and baffle are arranged on the die body. The position corresponding to the punching head located in the front position constitutes a preliminary forming forging position. The positions corresponding to the punching head and anvil stripping plate located in the rear position constitute a post-forging forming forging position. The post-forging forming forging position is arranged between the punching head and the baffle. The hot stamping and forging fin machine also includes a preheating material guide arranged at the front end of the fin die, the preheating material guide is provided with a second electric heating tube, the preheating material guide is used to preheat and guide the aluminum foil, and the cam device is provided with a material guiding cam, which is connected to the preheating material guide through a material guiding connecting rod and drives the preheating material guide to move synchronously.

2. The hot stamping forging fin machine according to claim 1, characterized in that: A heat insulation pad is arranged between the mold body and the base.

3. The hot stamping forging fin machine according to claim 1, characterized in that: A heat-insulating cover is arranged on the outer side of the mold body.

4. The hot stamping forging fin machine according to claim 1, characterized in that: The punching and forging head, the anvil stripping plate and the baffle plate are fixed on the die body by a pressing plate.

5. The hot stamping forging fin machine according to claim 1, characterized in that: Four second electric heating tubes are respectively arranged on the upper and lower sides of the preheating guide, and each second electric heating tube is arranged along the horizontal advancing direction of the aluminum foil.

6. The hot stamping forging fin machine according to claim 1, characterized in that: A spring assembly for stripping is connected below the anvil stripping plate.

Images