Cold chamber die casting machine for shell part

Abstract

The invention relates to the technical field of die-casting machines, in particular to a cold chamber die-casting machine for shell parts, which comprises a bottom frame, a first support and a second support are arranged at the top of the bottom frame, and is characterized by further comprising a sliding rail, a sliding frame, a first die holder and a second die holder, the second die holder is arranged on one side of the second support, a female die is arranged on the second die holder, a cavity is formed between the female die and the second die holder, a plurality of cooling pipes are detachably connected to one side of the female die, and flow valves are connected to the cooling pipes in series. And the number of the detachably connected cooling pipes corresponding to each width position is obtained based on the width, the cooling time of different thickness areas is set, the flow of each cooling pipe is calculated and obtained, and the size of the flow valve is controlled based on the flow of each cooling pipe. The cooling time requirements of areas with different thicknesses are met through flow control, and therefore the cooling effect is improved for shells with thin walls and thick walls.

Description

Technical Field

[0001] The present invention relates to the technical field of die-casting machines, and particularly to a cold chamber die-casting machine for housing parts. Background Art

[0002] A die-casting machine is a device that injects molten metal under pressure into a mold for cooling and forming, and a solid metal casting can be obtained after the mold is opened. Currently, when manufacturing a housing by a die-casting machine, in order to improve the efficiency of cooling and forming, a coolant is usually used to accelerate the cooling of the housing. The current cooling method is usually to cool evenly. However, when some parts of the housing are thick-walled and some parts are thin-walled, the effect of this uniform cooling is not very good, because generally, thick walls need to be cooled faster, while thin walls need to be cooled slower to avoid thermal stress deformation. Summary of the Invention

[0003] In view of this, an object of the present invention is to provide a cold chamber die-casting machine for housing parts to solve the problem that when some parts of the housing are thick-walled and some parts are thin-walled, the effect of uniform cooling is not very good.

[0004] Based on the above object, the present invention provides a cold chamber die-casting machine for housing parts, including a chassis. A first bracket and a second bracket are provided on the top of the chassis. It further includes: a slide rail, a carriage, a first mold base and a second mold base, wherein: The slide rail is arranged between the first bracket and the second bracket; The carriage is slidably connected to the slide rail; The first mold base is arranged on the carriage, and a punch is installed on the first mold base; The second mold base is arranged on one side of the second bracket, a die is installed on the second mold base, there is a cavity between the die and the second mold base, and a plurality of cooling pipes are detachably connected to one side of the die. A flow valve is connected in series on the cooling pipe. The cooling pipe is located in the cavity. By obtaining the widths of different thickness regions of the housing, based on the widths, the number of detachably connected cooling pipes corresponding to each width is obtained, the cooling time of different thickness regions is set, and the flow rate of each cooling pipe is calculated and obtained. Based on the flow rate of each cooling pipe, the size of the flow valve is controlled.

[0005] Optionally, the obtaining the number of detachably connected cooling pipes corresponding to each width based on the width includes: calculating the number of cooling pipes through the following formula N k :

[0006] Wherein L k represents the width of the k-th region of the housing, drepresents the diameter of the cooling pipe, S min represents the minimum center distance of the cooling pipes.

[0007] Optionally, calculating the flow rate of each cooling pipe includes: calculating the flow rate of each cooling pipe through the following formula q k :

[0008] where , Q k represents the heat dissipation required for the k-th region of the housing, , T k represents the set cooling time for the k-th region of the housing, η represents the heat transfer efficiency, ρ 1 represents the density of the coolant, c p1 represents the specific heat capacity of the coolant, ΔT 1 represents the temperature difference of the coolant before and after passing through the mold, ρ 2 represents the density of the housing material, c p2 represents the specific heat capacity of the housing material, Δ T 2 represents the temperature difference between the casting and the mold, where A k represents the housing k area of the region.

[0009] Optionally, a chute is provided on one side of the female mold, and the cooling pipe has a slider. The cooling pipe is detachably connected to the female mold by means of the cooperation between the chute and the slider.

[0010] Optionally, the die-casting machine further includes an ejection part, and the ejection part is arranged on the carriage. The ejection part is used to eject the cast housing.

[0011] Optionally, the ejection part includes a first hydraulic cylinder arranged on the carriage. A connecting member is provided on the telescopic rod of the first hydraulic cylinder, and an ejection rod is provided on the connecting member. The ejection rod passes through the first die holder and the punch and is slidably connected to the first die holder and the punch.

[0012] Optionally, the ejector rod is a hollow rod, and a connecting member is provided between the two ejector rods. The middle part of the connecting member is flat, and the two ends of the connecting member are telescopic rod structures. The two ends of the connecting member are smoothly connected to the arc-shaped openings provided on the ejector rod. One of the ejector rods is connected to a blower through an air inlet pipe, and an air outlet pipe is provided on the other ejector rod.

[0013] During cooling, a cooling air flow is generated by the blower. The cooling air flow passes through one of the ejector rods and then flows into the connecting member. The connecting member exchanges heat with the mold to cool the housing. The air flow after heat exchange flows into the other ejector rod and then is discharged through the air outlet pipe. When the ejector rod needs to work, since the two ends of the connecting member are smoothly connected to the arc-shaped openings provided on the ejector rod, at this time, as the ejector rod moves, the connecting member and the arc-shaped opening... When the ejector rod returns to the initial position, since the two ends of the connecting member are telescopic rod structures, the two ends of the connecting member are docked and connected to the arc-shaped openings provided on the ejector rod again.

[0014] As can be seen from the above, the present invention can also be cooled through the connecting member, which can meet the cooling requirements in more scenarios.

[0015] Optionally, a second hydraulic cylinder is provided on the first bracket, and the telescopic end of the second hydraulic cylinder is arranged on the carriage.

[0016] When the die-casting machine cools the housing, the coolant flowing through the cooling pipes dissipates heat from the housing in the mold. The number of cooling pipes arranged at different thickness parts of each housing is obtained by pre-calculating the width of different thickness areas in advance. According to the calculated results, the corresponding number of cooling pipes is installed. Then, according to the process requirements, the cooling time of different thickness areas is set, and the flow rate of each cooling pipe is calculated and obtained. Based on the flow rate of each cooling pipe, the size of the flow control valve is controlled.

[0017] As can be seen from the above, the present invention is based on setting the cooling time of different thickness areas and calculating and obtaining the flow rate of each cooling pipe, so as to realize the cooling time requirements of different thickness areas through the control of the flow rate. The flow rate increases at the thick wall to accelerate cooling, and the flow rate decreases at the thin wall to slow down cooling. Therefore, for the housing with thin walls and thick walls, the cooling effect is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only those of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0019] Figure 1Schematic structural diagram of the die-casting machine according to the embodiment of the present invention; Figure 2 Schematic diagram of the connection relationship between the cooling pipe and the female die according to the embodiment of the present invention.

[0020] The reference numerals in the figure are: 1. Chassis; 2. First bracket; 3. Second bracket; 4. Slide rail; 5. First die holder; 6. Second die holder; 7. Punch; 8. Female die; 9. Cooling pipe; 10. Slide block; 11. First hydraulic cylinder; 12. Connecting piece; 13. Ejector rod; 14. Connecting member; 15. Air inlet pipe; 16. Fan; 17. Air outlet pipe; 18. Second hydraulic cylinder; 19. Slide carriage. Detailed implementation manners

[0021] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with specific embodiments.

[0022] It should be noted that unless otherwise defined, the technical terms or scientific terms used in the present invention should be the general meanings understood by those with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this term cover the elements or objects listed after this term and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0023] As Figure 1 shown, a cold chamber die-casting machine for a housing part includes a chassis 1, a first bracket 2 and a second bracket 3 are provided on the top of the chassis 1, and further includes: a slide rail 4, a slide carriage 19, a first die holder 5 and a second die holder 6, wherein: The slide rail 4 is arranged between the first bracket 2 and the second bracket 3; The slide carriage 19 is slidably connected to the slide rail 4; The first die holder 5 is arranged on the slide carriage 19, and a punch 7 is installed on the first die holder 5; The second die holder 6 is arranged on one side of the second bracket 3. A female die 8 is installed on the second die holder 6. There is a cavity between the female die 8 and the second die holder 6. A plurality of cooling pipes 9 are detachably connected to one side of the female die 8. A flow valve is connected in series on the cooling pipe 9. The cooling pipe 9 is located in the cavity. By obtaining the width of different thickness regions of the shell, based on the width, the number of detachably connected cooling pipes 9 corresponding to each width is obtained. The cooling time of different thickness regions is set, and the flow rate of each cooling pipe 9 is calculated and obtained. Based on the flow rate of each cooling pipe 9, the size of the flow valve is controlled.

[0024] When this die-casting machine cools the shell, the coolant flowing through the cooling pipe 9 dissipates heat from the shell in the mold. The number of cooling pipes 9 arranged at different thickness parts of each shell is obtained by advance calculation based on the width of different thickness regions. According to the calculation result, the corresponding number of cooling pipes 9 is installed. Then, according to the process requirements, the cooling time of different thickness regions is set, and the flow rate of each cooling pipe 9 is calculated and obtained. Based on the flow rate of each cooling pipe 9, the size of the flow valve is controlled.

[0025] As can be seen from the above, the present invention is based on setting the cooling time of different thickness regions and calculating and obtaining the flow rate of each cooling pipe 9, so as to realize the cooling time requirements of different thickness regions through the control of the flow rate. The flow rate increases at the thick wall to accelerate cooling, and the flow rate decreases at the thin wall to slow down cooling. Therefore, for a shell with thin walls and thick walls, the cooling effect is improved.

[0026] In some embodiments, the obtaining the number of detachably connected cooling pipes 9 corresponding to each width based on the width includes: calculating the number of cooling pipes 9 through the following formula N k :

[0027] where L k represents the width of the k-th region of the shell, d represents the diameter of the cooling pipe 9, S min represents the minimum center distance of the cooling pipes 9. Optionally, S min ≥2d.

[0028] In some embodiments, the calculating and obtaining the flow rate of each cooling pipe 9 includes: calculating the flow rate of each cooling pipe 9 through the following formula q k :

[0029] where , Qk Denotes the heat dissipation required for the k-th region of the housing , T k Denotes the set cooling time for the k-th region of the housing η Denotes the heat exchange efficiency ρ 1 Denotes the density of the coolant c p1 Denotes the specific heat capacity of the coolant ΔT 1 Denotes the temperature difference of the coolant before and after passing through the mold ρ 2 Denotes the density of the housing material c p2 Denotes the specific heat capacity of the housing material Δ T 2 Denotes the temperature difference between the casting and the mold, where A k Denotes the k Area of the region of the housing.

[0030] As Figure 2 shown, in some embodiments, a chute is provided on one side of the female mold 8, the cooling pipe 9 has a slider 10, and the cooling pipe 9 is detachably connected to the female mold 8 by means of the cooperation between the chute and the slider 10. This way, the cooling pipe 9 can be conveniently disassembled and installed when replacing the mold.

[0031] In some embodiments, the die-casting machine further includes an ejection part, the ejection part is arranged on the carriage 19, and the ejection part is used to eject the cast housing. This facilitates the removal of the housing.

[0032] Optionally, the ejection part includes a first hydraulic cylinder 11 arranged on the carriage 19, a connecting piece 12 is provided on the telescopic rod of the first hydraulic cylinder 11, an ejection rod 13 is provided on the connecting piece 12, and the ejection rod 13 passes through the first die holder 5 and the male mold 7 and is slidably connected to the first die holder 5 and the male mold 7. During operation, the first hydraulic cylinder 11 extends to drive the connecting piece 12 to move, the connecting piece 12 drives the ejection rod 13 to move, and the housing is ejected by the ejection rod 13 and then removed subsequently.

[0033] To further improve the cooling effect, in some embodiments, the ejection rod 13 is a hollow rod, a connecting member 14 is provided between the two ejection rods 13, the middle of the connecting member 14 is flat, the two ends of the connecting member 14 are telescopic rod structures, the two ends of the connecting member 14 are smoothly connected to the arc-shaped openings provided on the ejection rod 13, and one of the ejection rods 13 is connected to a blower 16 through an air inlet pipe 15, and an air outlet pipe 17 is provided on the other ejection rod 13.

[0034] During cooling, a cooling air flow is generated by the blower 16. The cooling air flow passes through one of the ejector rods 13, then flows into the connecting member 14, exchanges heat with the mold through the connecting member 14 to cool the housing, and the air flow after heat exchange flows into the other ejector rod 13, and then is discharged through the air outlet pipe 17. When the ejector rod 13 needs to work, since both ends of the connecting member 14 are smoothly connected to the arc-shaped openings provided on the ejector rod 13, at this time, as the ejector rod 13 moves, the connecting member 14 and the arc-shaped openings move. When the ejector rod 13 returns to its initial position, since both ends of the connecting member 14 are of telescopic rod structure, at this time, both ends of the connecting member 14 are again docked and connected to the arc-shaped openings provided on the ejector rod 13.

[0035] As can be seen from the above, the present invention can also be cooled through the connecting member 14, and can meet the cooling requirements in more scenarios.

[0036] In some embodiments, a second hydraulic cylinder 18 is provided on the first bracket 2, and the telescopic end of the second hydraulic cylinder 18 is arranged on the carriage 19. By the operation of the second hydraulic cylinder 18, the carriage 19 is driven to move, thereby driving the punch 7 to move, so as to realize the cooperation and separation of the punch 7 and the die 8.

[0037] Those of ordinary skill in the art should understand that: the discussion of any above embodiment is only exemplary, and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as above, which are not provided in detail for the sake of brevity.

[0038] The present invention aims to cover all such substitutions, modifications and variations falling within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A cold chamber die casting machine for a housing part, comprising a base frame (1), wherein a first bracket (2) and a second bracket (3) are provided on the top of the base frame (1), characterized in that: Also includes: A slide rail (4), a slide frame (19), a first mold base (5) and a second mold base (6), wherein: The slide rail (4) is arranged between the first bracket (2) and the second bracket (3); The slide frame (19) is slidably connected to the slide rail (4); The first die base (5) is arranged on the slide (19), and a punch (7) is mounted on the first die base (5); The second die base (6) is arranged on one side of the second bracket (3); a die (8) is mounted on the second die base (6); a cavity is provided between the die (8) and the second die base (6); a plurality of cooling pipes (9) are detachably connected to one side of the die (8); a flow valve is connected in series to the cooling pipe (9); the cooling pipe (9) is located in the cavity; by obtaining the width of different thickness areas of the shell, the number of detachably connected cooling pipes (9) corresponding to each width is obtained based on the width, the cooling time of different thickness areas is set, and the flow of each cooling pipe (9) is calculated and obtained; and the size of the flow valve is controlled based on the flow of each cooling pipe (9).

2. A cold chamber die casting machine for a housing according to claim 1, characterized in that: The method of obtaining the number of detachably connected cooling tubes (9) corresponding to each width based on the width includes: obtaining the number of cooling tubes (9) by calculating the following formula: N k :

3. Among them L k represents the width of the kth region of the shell, d represents the diameter of the cooling pipe (9), S min Indicates the minimum center distance of the cooling pipe (9).

4. A cold chamber die casting machine for a housing according to claim 2, characterized in that: The method of calculating the flow rate of each cooling pipe (9) comprises: calculating the flow rate of each cooling pipe (9) by the following formula: q k :

5. Among them , Q k represents the heat dissipation required for the kth area of ​​the shell, , T k represents the cooling time set for the kth zone of the shell, η represents the heat transfer efficiency, ρ 1 Indicates the coolant density, c p1 represents the specific heat capacity of the coolant, Δ T 1 represents the temperature difference of the coolant before and after it passes through the mold. ρ 2 represents the shell material density, c p2 represents the specific heat capacity of the shell material, ΔT 2 represents the temperature difference between the casting and the mold, where A k Indicates the shell k The area of ​​the region.

6. A cold chamber die casting machine for a housing according to claim 1, characterized in that: A slide groove is provided on one side of the die (8), and the cooling pipe (9) has a slider (10). The cooling pipe (9) and the die (8) are detachably connected by means of the cooperation between the slide groove and the slider (10).

7. A cold chamber die casting machine for a housing according to claim 1, characterized in that: The die-casting machine also includes an ejector portion, which is arranged on the slide (19) and is used to eject the die-cast housing.

8. The cold chamber die casting machine for housing parts according to claim 5, characterized in that: The ejection part comprises a first hydraulic cylinder (11) arranged on the slide (19); a connecting piece (12) is provided on the telescopic rod of the first hydraulic cylinder (11); an ejection rod (13) is provided on the connecting piece (12); the ejection rod (13) passes through the first mold base (5) and the punch (7) and is slidably connected to the first mold base (5) and the punch (7).

9. A cold chamber die casting machine for a housing according to claim 6, characterized in that: The ejector rod (13) is a hollow rod. A connecting piece (14) is provided between the two ejector rods (13). The middle part of the connecting piece (14) is flat. Both ends of the connecting piece (14) are telescopic rod structures. Both ends of the connecting piece (14) are smoothly connected to arc-shaped openings provided on the ejector rods (13). One of the ejector rods (13) is connected to a fan (16) via an air inlet pipe (15), and the other ejector rod (13) is provided with an air outlet pipe (17).

10. The cold chamber die casting machine for housing parts according to claim 1, characterized in that: A second hydraulic cylinder (18) is provided on the first bracket (2), and a telescopic end of the second hydraulic cylinder (18) is arranged on the slide (19).

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