Single-double shot die casting machine and head plate design method thereof

Abstract

The present application discloses a single-double-shot die-casting machine and a head plate design method thereof. The single-double-shot die-casting machine includes a head plate, a material lower frame and a die-shooting module group; the head plate and the material lower frame are fixedly arranged and spaced apart; if the number of the die-shooting module group is one, the die-shooting module group is installed in the middle of the material lower frame and is matched and connected with the interface in the middle of the head plate; if the number of the die-shooting module group is two, the die-shooting module group is symmetrically installed on both sides of the material lower frame and is matched and connected with the interfaces on both sides of the head plate respectively. The head plate design method is used to design the head plate for the above-mentioned single-double-shot die-casting machine. Beneficial effects of the present application: Compared with the two traditional independent single-double-shot die-casting methods, the present application can realize the single-shot and double-shot modes by only changing the number of the die-shooting module groups, and can be adjusted according to actual production needs, thereby effectively improving the scope of application of the present application and effectively reducing production costs.

Description

Technical Field

[0001] The present application relates to the technical field of die-casting machines, and in particular to a single- and double-shot die-casting machine and a head plate design method thereof. Background Art

[0002] With the development of die-casting aluminum alloy material technology, its fluidity, strength and toughness can be significantly improved. Therefore, the size of metal products that can be produced by die-casting is gradually increasing, such as the integrated die-casting of automobile bodies.

[0003] As the size of die-cast products increases, the cavity distance of the corresponding die-casting mold gradually increases. When traditional die-casting machines are used to die-cast large-sized products, the single-shot method makes the product die-casting time relatively long, which in turn affects the processing accuracy of the product. Therefore, the prior art proposes a single-double-shot die-casting machine, that is, a die-casting machine with two shot mechanisms, which can simultaneously die-cast the die-casting mold to improve the die-casting efficiency and die-casting accuracy.

[0004] However, the existing single-shot die-casting machines and single- and double-shot die-casting machines are generally used independently, which means that when enterprises produce products of different types and sizes, they need to purchase both single-shot die-casting machines and single- and double-shot die-casting machines, thereby increasing the production cost burden of the products. Summary of the invention

[0005] One of the objects of the present application is to provide a single double-shot die-casting machine that can solve at least one of the defects in the above-mentioned background technology.

[0006] Another object of the present application is to provide a head panel design method that can solve at least one of the defects in the above-mentioned background technology.

[0007] In order to achieve at least one of the above-mentioned purposes, the technical solution adopted in the present application is: a single-double shot die-casting machine, including a head plate, a shot lower frame and an injection mold group; the head plate and the shot lower frame are both fixedly arranged, and there is a gap between the two; if the number of the injection mold group is one, the injection mold group is installed in the middle part of the shot lower frame and is matched and connected with the interface in the middle part of the head plate; if the number of the injection mold group is two, the injection mold group is symmetrically installed on both sides of the shot lower frame and is respectively matched and connected with the interfaces on both sides of the head plate.

[0008] Preferably, the area between the interface in the middle of the head plate and the interfaces on both sides is the main reinforcement, and the area between the interfaces on both sides of the head plate and the side edges is the secondary reinforcement; the thickness of the main reinforcement is greater than the thickness of the secondary reinforcement, and the width of the main reinforcement is less than the width of the secondary reinforcement.

[0009] Preferably, the thickness of the main reinforcement is 1.4 to 1.6 times the thickness of the secondary reinforcement; the width of the main reinforcement is 0.5 to 0.7 times the width of the secondary reinforcement.

[0010] Preferably, the shooting lower frame includes a connecting section, an oil tank and a mounting section which are arranged in sequence; the connecting section is fixedly connected to the locking mold lower frame for mounting the head plate, the mounting section is used for mounting the injection module group, and the oil tank is provided with three oil receiving ports along the width direction; if one of the injection module groups is installed on the mounting section, the injection module group is connected to the oil receiving port in the middle, and if a pair of the injection module groups is installed on the mounting section, the injection module group is connected to the oil receiving ports on both sides.

[0011] Preferably, the oil tank is divided into multiple areas by a plurality of partitions arranged in a horizontal and vertical staggered manner; at least some of the partitions are provided with gaps in the upper portion to allow air circulation between adjacent divided areas; at least some of the partitions are provided with gaps in the lower portion to allow oil circulation between adjacent divided areas.

[0012] A head plate design method applied to the above-mentioned single-shot and double-shot die-casting machine includes the following design steps:

[0013] S100: Preliminarily determine the outer contour dimensions of the head plate according to the structural dimensions of the injection mold set;

[0014] S200: Calculate the total force area of ​​the head plate according to the impact force of the injection die set and the clamping force of the die casting machine;

[0015] S300: Based on the strength verification calculation of the head plate under the clamping force, the main reinforcement and secondary reinforcement formed between multiple interfaces of the head plate are divided into proportions of the force-bearing area;

[0016] S400: The stress and strain analysis of the head plate is performed using finite element software to obtain the thickness dimensions of the main and secondary reinforcements with the minimum stress peak and minimum deformation.

[0017] Preferably, step S200 includes the following process:

[0018] S210: Calculate the clamping force F applied by the clamping cylinder to the head plate through the output pressure P of the clamping cylinder of the die casting machine and the piston rod diameter D of the clamping cylinder. S ;

[0019] S220: Set the impact force F applied by the injection module to the head plate C ≤kF S , k represents the safety factor;

[0020] S230: According to formula F C =P 0·S, calculate the total force area S of the head plate; where P 0 Indicates the output pressure of the injection cylinder of the injection module.

[0021] Preferably, the safety factor k is 1.05-1.15.

[0022] Preferably, step S300 includes the following process:

[0023] S310: Obtain the width dimension relationship between the main reinforcement and the secondary reinforcement according to the outer contour dimension of the head plate;

[0024] S320: According to the structural distribution of the main reinforcement and the secondary reinforcement, all the load-bearing sections of the head plate are divided into dangerous sections;

[0025] S330: Setting a benchmark and calculating the centroid according to the size and position of each dangerous section obtained in step S320;

[0026] S340: Calculate the moment of inertia of each dangerous section about the centroid axis according to the centroid position expression obtained in step S330;

[0027] S350: Substitute the obtained inertia moment expression into the bending moment calculation formula to derive the expression of the maximum bending stress at the dangerous section;

[0028] S360: According to the limited clamping force and the safety stress of the material, the expression of the maximum bending stress is iterated to obtain the optimal width dimensions of the main and secondary ribs.

[0029] Preferably, in step S330, for a vertically arranged head plate, a horizontal line passing through the center of the middle interface of the head plate is used as a reference, or a horizontal line passing through the centers of the interfaces on both sides of the head plate is used as a reference.

[0030] Compared with the prior art, the beneficial effects of this application are:

[0031] Compared with the two traditional independent single and double die-casting methods, the present application can realize both single-shot and double-shot modes by only changing the number of injection modules, and can be adjusted according to actual production needs, thereby effectively improving the scope of application of the present application and effectively reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the overall structure of the double-shot installation of the single-shot and double-shot die-casting machine in this application.

[0033] Figure 2 This is a schematic diagram of the structure of the single-shot and double-shot die-casting machine in this application after removing the shot module.

[0034] Figure 3This is a schematic diagram of the partial structure of the head plate in this application.

[0035] Figure 4 It is a schematic diagram of the structure of the material shooting unloading rack in this application.

[0036] Figure 5 Schematic diagram of the head plate design method in this application.

[0037] Figure 6 This is a stress cloud diagram of the head plate of this application under finite element simulation.

[0038] Figure 7 For this application Figure 6 The stress cloud diagram of comparative example 1 of the head plate shown under finite element simulation.

[0039] Figure 8 For this application Figure 6 The stress cloud diagram of comparative example 2 of the head plate shown in FIG. 1 under finite element simulation.

[0040] Fig. 9 This is the strain cloud diagram of the head plate of this application under finite element simulation.

[0041] Fig.10 For this application Fig. 9 The strain cloud diagram of comparative example 1 of the head plate under finite element simulation is shown.

[0042] Fig.11 For this application Fig. 9 The strain cloud diagram of comparative example 2 of the head plate shown in FIG. 1 under finite element simulation.

[0043] In the figure: a clamping lower frame 100, a head plate 200, a main rib 201, a secondary rib 202, a shot lower frame 300, a connecting section 310, an oil tank 320, an oil receiving port 321, a partition plate 322, a notch 323, a mounting section 330, and an injection mold assembly 400. DETAILED DESCRIPTION

[0044] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0045] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present application.

[0046] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0047] In this application, 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 connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0049] The terms "including" and "having" and any variations thereof in the specification and claims of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0050] One aspect of the present application provides a single-double shot die casting machine, such as Figure 1 and Figure 2As shown, one of the preferred embodiments includes a head plate 200, a shot lower frame 300 and an injection mold group 400. The head plate 200 is fixedly arranged, and the head plate 200 is used to install a die-casting mold (not shown); the head plate 200 is provided with three interfaces along the width direction, one of which is located in the middle area of ​​the head plate 200, and the other two interfaces are respectively located on both sides of the middle interface. The shot lower frame 300 is fixedly arranged, and there is a gap between the shot lower frame 300 and the head plate 200, and the shot lower frame 300 is used to install the injection mold group 400. When single-shot die-casting is required, one injection mold group 400 can be installed in the middle of the shot lower frame 300 and matched with the interface in the middle of the head plate 200. When double-shot die-casting is required, two injection mold groups 400 can be symmetrically installed on both sides of the shot lower frame 300 and matched with the interfaces on both sides of the head plate 200.

[0051] It is understandable that for the single-shot and double-shot die-casting machine of the present application, whether it is single-shot die-casting or double-shot die-casting, the number of head plates 200 and the material lower rack 300 and the overall connection relationship have not changed, only the number and installation position of the die-shot module 400 have changed. For the enterprise, only three die-shot module 400 are needed at most to realize single-shot die-casting and double-shot die-casting. Compared with the traditional method that requires two sets of die-casting equipment, the present application can effectively improve the scope of application and effectively reduce production costs.

[0052] It should be noted that the models of the injection mold groups 400 used in the single-shot mode and the double-shot mode of the present application can be the same or different. For the same model of injection mold groups 400, the present application only needs to set up two injection mold groups 400 to realize the single-shot mode and the double-shot mode of the die-casting machine; for different models of injection mold groups 400, the present application needs to set up three injection mold groups 400 to realize the single-shot mode and the double-shot mode of the die-casting machine. The specific model selection of the injection mold group 400 can be selected according to the actual needs of technicians in this field; the specific structure and working principle of the injection mold group 400 are well known to technicians in this field, so they will not be elaborated in detail here.

[0053] In this embodiment, Figures 1 to 3 As shown, the area between the interface in the middle of the head plate 200 and the interfaces on both sides is the main rib 201, and the area between the interfaces on both sides of the head plate 200 and the side edges is the secondary rib 202. When designing the structure of the head plate 200, it is necessary to design the thickness of the main rib 201 to be greater than the thickness of the secondary rib 202, and at the same time, the width of the main rib 201 is set to be smaller than the width of the secondary rib 202.

[0054] It is understandable that the interface provided on the head plate 200 is used to connect with the punching rod on the injection module 400. In order to facilitate the installation of the punching rod, the area near the interface on the head plate 200 needs to be set to avoid air. When single-shot die-casting is performed, the punching impact force applied by the injection module 400 to the head plate 200 is mainly concentrated near the main rib 201, and when double-shot die-casting is performed, the punching impact force applied by the injection module 400 to the head plate 200 will be dispersed to the main rib 201 and the secondary rib 202 on both sides of the corresponding interface. Whether it is single-shot die-casting or double-shot die-casting, the main rib 201 needs to be impacted, that is, the working environment of the main rib 201 is worse than that of the secondary rib 202. Since the impact force exerted by the injection mold 400 will mainly cause the head plate 200 to bend, the thickness of the main reinforcement 201 is designed to be greater than the thickness of the secondary reinforcement 202 when designing the main reinforcement 201 and the secondary reinforcement 202. This can ensure that the main reinforcement 201 has a stronger bending section coefficient, thereby ensuring the working safety of the head plate 200. As for the width design of the main reinforcement 201 and the secondary reinforcement 202, since the larger the size of the head plate 200, the heavier the corresponding weight, it is necessary to reduce the width of the main reinforcement 201 and the secondary reinforcement 202 as much as possible while meeting the structural strength. Considering the thickness design dimensions of the main reinforcement 201 and the secondary reinforcement 202, in order to ensure that the secondary reinforcement 202 meets the structural strength requirements, it is necessary to design the width of the secondary reinforcement 202 to be greater than the width of the main reinforcement 201.

[0055] Specifically, the thickness and width of the main rib 201 and the secondary rib 202 are designed in detail through a specific design method. The design dimensions that can ensure that the head plate 200 has better performance are that the thickness of the main rib 201 is 1.4 to 1.6 times the thickness of the secondary rib 202, and the width of the main rib 201 is 0.5 to 0.7 times the width of the secondary rib 202.

[0056] In this embodiment, Figure 1 and Figure 2 As shown, the injection lower frame 300 includes a connecting section 310, an oil tank 320 and a mounting section 330 which are arranged in sequence. The connecting section 310 is fixedly connected to the clamping lower frame 100 for mounting the head plate 200 to ensure the structural stability of the entire die-casting machine, thereby ensuring the accuracy during the injection process. The mounting section 330 is used for the installation of the injection module 400, and the oil tank 320 is provided with three oil receiving ports 321 along the width direction; if one injection module 400 is installed on the mounting section 330, the injection module 400 is connected to the middle oil receiving port 321, and if a pair of injection modules 400 are installed on the mounting section 330, the injection module 400 is connected to the oil receiving ports 321 on both sides.

[0057] Specifically, Figure 4As shown, the oil tank 320 is divided into a plurality of areas by a plurality of partitions 322 arranged in a staggered manner. At least some of the partitions 322 are provided with notches 323 on the upper part to allow air to circulate between the divided adjacent areas. At least some of the partitions 322 are provided with notches 323 on the lower part to allow oil to circulate between the divided adjacent areas.

[0058] It is understandable that the middle area of ​​the oil tank 320 is the main oil return area and the main channel for oil return, and the two sides of the oil tank 320 are the auxiliary oil return areas. In the double injection mode, the setting of the partition 322 can effectively reduce the impact of the oil return flow, making the oil flow more orderly, thereby reducing noise and vibration to improve the punching stability and reliability of the injection module 400. At the same time, by opening a notch 323 at the bottom of the partition 322, the oil flow in each area of ​​the oil tank 320 is ensured while the circulation speed is reduced, which is conducive to the cooling and heat dissipation of the oil, the precipitation of bubbles and the precipitation of impurities.

[0059] Another aspect of the present application provides a head plate design method for the above-mentioned single-shot and double-shot die-casting machine, such as Figure 5 As shown, one of the preferred embodiments includes the following design steps:

[0060] S100: Preliminarily determine the outer contour dimensions of the head plate 200 according to the structural dimensions of the injection mold assembly 400 .

[0061] S200: Calculate the total force-bearing area of ​​the head plate 200 according to the punching impact force of the injection mold assembly 400 and the clamping force of the die-casting machine.

[0062] S300: Based on the strength verification calculation of the head plate 200 under the clamping force, the main ribs 201 and the secondary ribs 202 formed between the multiple interfaces of the head plate 200 are divided into proportions of the force-bearing areas.

[0063] S400: Perform stress and strain analysis on the head plate 200 by using finite element software to obtain the thickness dimensions of the main reinforcement 201 and the secondary reinforcement 202 with the minimum stress peak value and the minimum deformation.

[0064] It can be understood that, for step S100, the outer contour dimensions of the head plate 200 mainly depend on the installation dimensions of the injection module 400 in the dual-injection mode. Specifically, the width of a single injection module 400 can be set to A, and the minimum spacing between the two injection modules 400 for normal installation can be B. Since the position of the punching rod of the injection module 400 is generally located in the middle of the injection module 400, the minimum spacing between the two interfaces on the head plate 200 for dual-injection die casting is A+B. Then, based on the design dimensions of the interface, analyze whether the width of the main ribs 201 between adjacent interfaces meets the basic structural strength requirements. If the width of the main ribs 201 meets the structural strength requirements, the contour dimension L of the head plate 200 in the width direction is at least A+B+2C; wherein C represents the distance from the edge of the secondary rib 202 that meets the basic structural strength to the center of the interface on the same side. If the width of the main reinforcement 201 does not meet the basic structural strength requirements, then the outline dimension L of the head plate 200 in the width direction is at least A+B+2C+D; where D represents the increase in the width of the main reinforcement 201, so that the widened main reinforcement 201 meets the basic structural strength requirements. Generally speaking, the structure of the head plate 200 adopts a positive direction structure so that the Corinthian columns installed at the four corners of the head plate 200 are adjacent and equidistant in the horizontal and vertical directions.

[0065] It should be known that the width of the main reinforcement 201 that meets the basic structural strength can be calculated using a simple strength calculation formula, or can be selected based on the experience of technical personnel in this field; this size is only a preliminary size and will be optimized later.

[0066] In this embodiment, step S100 only determines the basic outline size of the head plate 200. Figures 1 to 3 It can be seen that the interface area of ​​the head plate 200 is designed with air avoidance, which can facilitate the installation of the punching rod at the subsequent interface position and reduce the weight of the head plate 200. For the design of the head plate 200, it is necessary to increase the space of the air avoidance area as much as possible under the adjustment of satisfying the structural strength and facilitating the installation of the punching rod, so that the weight of the head plate 200 can be reduced as much as possible, thereby saving costs. Then the size of the air avoidance area at the interface position can be determined according to the total force area S required by the head plate 200, that is, the total force area S of the head plate 200 determines the impact bearing capacity of the head plate 200. Then, when the basic outline size of the head plate 200 has been determined, the total force area S can be calculated to obtain the total area size of the air avoidance area, and then specific structural division can be performed. For ease of understanding, the specific calculation process of the total force area S in step S200 will be described in detail below.

[0067] Specifically, step S200 includes the following process:

[0068] S210: Calculate the clamping force F applied by the clamping cylinder to the head plate 200 through the output pressure P of the clamping cylinder of the die casting machine and the piston rod diameter D of the clamping cylinder. S .

[0069] S220: Setting the punching impact force F applied by the injection module 400 to the head plate 200 C ≤kF S , k represents the safety factor.

[0070] S230: According to formula F C =P 0 ·S, calculate the total force-bearing area S of the head plate 200; where P 0 Indicates the output pressure of the injection cylinder of the injection module 400.

[0071] It is understandable that when the die-casting machine is die-casting, the die-casting mold on the head plate 200 needs to ensure stable mold clamping under the clamping force applied by the clamping mechanism (not shown), so the head plate 200 will be supported by the clamping force of the clamping mechanism to resist the impact of the injection mold group 400 during die-casting. However, in order to ensure the working safety of the die-casting process, it is necessary to ensure that the impact force applied by the injection mold group 400 to the head plate 200 does not exceed the clamping force too much, otherwise the clamping mechanism may fail. Therefore, the value of the safety factor k in step S220 is generally 1.05~1.15, preferably 1.1.

[0072] It should be known that after calculating the total force-bearing area S of the head plate 200 through the above steps S210 to S230, the total area of ​​the avoidance areas corresponding to the three interfaces can be obtained by subtracting the total force-bearing area S from the total cross-sectional area of ​​the head plate 200. Finally, the proportion of the main reinforcement 201 and the secondary reinforcement 202 in the total force-bearing area S can be obtained by accurately calculating the structural dimensions of the main reinforcement 201 and the secondary reinforcement 202 based on strength verification. In this way, the width dimensions of the main reinforcement 201 and the secondary reinforcement 202 can be determined based on the position of the interface, and the size of the avoidance area at the interface position can also be determined. For ease of understanding, the process of calculating the proportion of the main reinforcement 201 and the secondary reinforcement 202 in the total force-bearing area will be described below.

[0073] In this embodiment, step S300 includes the following process:

[0074] S310: Obtain a width dimension relationship between the main rib 201 and the secondary rib 202 according to the outer contour dimension of the head plate 200 .

[0075] S320: According to the structural distribution of the main reinforcement 201 and the secondary reinforcement 202, all the stress-bearing sections of the head plate 200 are divided into dangerous sections.

[0076] S330: Set a benchmark and calculate the centroid according to the size and position of each dangerous section obtained in step S320.

[0077] S340: Calculate the moment of inertia of each dangerous section about the centroid axis according to the centroid position expression obtained in step S330.

[0078] S350: Substitute the obtained expression of moment of inertia into the bending moment calculation formula to derive the expression of the maximum bending stress at the dangerous section.

[0079] S360: According to the limited clamping force and the safety stress of the material, the expression of the maximum bending stress is iterated to obtain the optimal width dimensions of the main rib 201 and the secondary rib 202.

[0080] It is understandable that when the centroid is calculated in step S330, the reference is determined according to the force position of the head plate 200. In the single-shot mode, the force position of the head plate 200 is located at the middle interface, and the reference can be a horizontal line passing through the center of the middle interface; in the double-shot mode, the force position of the head plate 200 is located at the interfaces on both sides, and the reference can be a horizontal line passing through the centers of the interfaces on both sides. In actual use, if the model of the injection module 400 used in the single-shot mode and the double-shot mode is the same, then the three interfaces are of the same height, and the reference is unified at this time. If the model of the injection module 400 used in the single-shot mode and the double-shot mode is different, then the three interfaces will not be of the same height, and there will be two references at this time. The specific reference selection will be determined by the worst working condition of the head plate 200 under the two injection modes.

[0081] To facilitate further understanding, step S300 will be described in detail below in conjunction with specific parameters.

[0082] Specifically, Figure 3 As shown, assuming that the reference passes through the midpoint of the middle interface and divides the head plate 200 equally from top to bottom, the heights of the air-avoidance areas corresponding to the three interfaces are straight and flush with each other. The width of the air-avoidance areas corresponding to the interfaces on both sides can be set as X 1 , the width of the air-avoidance area corresponding to the middle interface is X 2 , the width of the main reinforcement 201 is X 4 , the width of the secondary reinforcement 202 is X 3 The height from the upper end of the air-avoiding area corresponding to the interface to the upper edge of the head plate 200 is H 1 The height from the upper edge of the secondary reinforcement 202 to the upper edge of the head plate 200 is H 2 , the height from the upper edge of the secondary reinforcement 202 to the reference is H 3 .

[0083] Through the above analysis, we can get the total force area S=4(X 3×H 2 )+4(X 1 ×H 1 )+4[X 4 ×(H 2 + H 3 ) ]+2(X 2 ×H 1 ), and the width of the head plate 200 is L=2X 1 +X 2 +2X 3 +2X 4 If L and S are known, the width X of the main reinforcement 201 in step S310 can be obtained. 4 and the width X of the secondary reinforcement 202 3 The relational expression of .

[0084] In step S320, the division of dangerous sections is mainly to facilitate the subsequent calculation of the centroid. According to the structural distribution of the main reinforcement 201 and the secondary reinforcement 202, the dangerous section areas are divided into the main reinforcement 201 and the extended areas at both ends, the secondary reinforcement 202 and the extended areas at both ends, and the corresponding areas at the upper and lower parts of each interface.

[0085] The centroid of the dangerous section calculated in step S330 is the equivalent centroid y of all dangerous sections. The specific calculation formula is as follows:

[0086] .

[0087] Among them, S i Indicates the area corresponding to each dangerous section, h i Indicates the height of the center point of each dangerous section relative to the reference. For ease of understanding, the following will take the dangerous section corresponding to the upper area of ​​the middle interface as an example, assuming that the area of ​​the dangerous section is S 1 , the corresponding centroid height is h 1 ; then there is S 1 =X 2 ×H 1 ,h 1 =H 2 -0.5H 1 +H 3 .

[0088] In step S340, the moment of inertia J of each dangerous section about the equivalent centroid y axis is y The calculation formula is as follows:

[0089] .

[0090] Among them, J yirepresents the moment of inertia of each dangerous section; taking the dangerous section corresponding to the upper area of ​​the middle interface as an example, let the moment of inertia of the dangerous section J y1 =X 2 ×H 1 3 / 12.

[0091] In step S350, according to the maximum bending moment M of the head plate 200 max , we can get the maximum bending stress σ at the dangerous section b The calculation formula is as follows:

[0092] σ b = (M max ×y) / J y .

[0093] It can be understood that the maximum bending moment M max It can be calculated based on 1.1 times the clamping force. Through all the previous steps, the maximum bending stress σ b The calculation formula is an expression for the width of the main reinforcement 201 and the secondary reinforcement 202. Then according to the maximum bending stress σ b By comparing with the safety stress [σ] specified in the national standard or industry standard, we can get the expression of the width of the main reinforcement 201 and the secondary reinforcement 202 with respect to the safety stress [σ], and then by iterating the formula, we can get the width dimensions of the main reinforcement 201 and the secondary reinforcement 202 corresponding to the head plate 200 with the best structural strength and weight. Then, based on the obtained width dimensions of the main reinforcement 201 and the secondary reinforcement 202, we can also reversely determine the structural dimensions of the air avoidance area corresponding to each interface.

[0094] It should be known that the structural dimensions of the end face of the head plate 200 can be determined through the above steps S310 to S360, and the thickness of the head plate 200 is mainly reflected in the ability to resist deformation after being impacted by the material. Therefore, it is difficult to obtain the optimal thickness dimension of the head plate 200 through numerical calculation. The finite element method can obtain the deformation of the head plate 200 at a microscopic angle through finite element simulation, so this embodiment can obtain the thickness dimensions of the main reinforcement 201 and the secondary reinforcement 202 through finite element simulation. There are many common finite element analysis software. For the sake of easy understanding, the following will take ANSYS software for finite element analysis as an example for detailed description.

[0095] Specifically, the structural model of the aforementioned head plate 200 is established using ANSYS software, and constraints are set and loads are applied to the established model to simulate actual working conditions. In order to verify the accuracy of the analysis results, finite element analysis is performed on head plates 200 of three different thicknesses, which are defined as head plate 1, head plate 2, and head plate 3. In head plate 1, the thickness of the main reinforcement 201 is 412 mm, and the thickness of the secondary reinforcement 202 is 276 mm; in head plate 2, the thickness of the main reinforcement 201 is 462 mm, and the thickness of the secondary reinforcement 202 is 326 mm; in head plate 3, the thickness of the main reinforcement 201 is 212 mm, and the thickness of the secondary reinforcement 202 is 400 mm.

[0096] like Figures 6 to 8 As shown, they are the stress distribution cloud diagrams of head plate 1 to head plate 3. It can be seen from the figure that during the die casting process, the head plate 200 mainly bears the impact force from the injection mold 400. The part where the injection cylinder is installed bears the direct effect of the injection force, and the stress level is relatively high. Due to the transmission and concentration of force at the connection between the connecting column and the reinforcing rib, these parts are prone to high stress. The maximum stress borne when the main rib 201 is 412mm thick and the secondary rib 202 is 276mm thick is 94MPa and 91MPa; the stress when the main rib 201 is 462mm thick and the secondary rib 202 is 326mm thick is 97MPa and 104MPa; the stress when the main rib 201 is 212mm thick and the secondary rib 202 is 400mm thick is 149MPa and 114MPa. In summary, in this embodiment, when the thickness of the main reinforcement 201 is 1.5 times the thickness of the secondary reinforcement 202, the stress borne is the smallest; when the thickness of the main reinforcement 201 is 1.4 times the thickness of the secondary reinforcement 202, the stress borne is slightly increased; when the thickness of the main reinforcement 201 is less than the thickness of the secondary reinforcement 202, the stress borne is significantly increased.

[0097] like Figures 9 to 11 As shown, they are the strain distribution cloud diagrams of head plate one to head plate three, respectively. The maximum strain generated when the main reinforcement 201 is 412mm thick and the secondary reinforcement 202 is 276mm thick is 5.081mm; the maximum strain generated when the main reinforcement 201 is 462mm thick and the secondary reinforcement 202 is 326mm thick is 5.8877mm; the maximum strain generated when the main reinforcement 201 is 212mm thick and the secondary reinforcement 202 is 400mm thick is 6.0483mm. In this embodiment, the deformation generated when the thickness of the main reinforcement 201 is 1.5 times the thickness of the secondary reinforcement 202 is the smallest, the deformation generated when the thickness of the main reinforcement 201 is 1.4 times the thickness of the secondary reinforcement 202 increases, and the deformation generated when the thickness of the main reinforcement 201 is less than the thickness of the secondary reinforcement 202 further increases. Therefore, in this embodiment, the thickness of the main reinforcement 201 is preferably 1.5 times the thickness of the secondary reinforcement 202.

[0098] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A single-shot and double-shot die-casting machine, characterized in that: It includes a head plate, a material shooting lower frame and a pressure injection module; the head plate and the material shooting lower frame are both fixedly arranged, and there is a gap between them; If the number of the injection mold set is one, the injection mold set is installed in the middle of the injection lower frame and is matched and connected with the interface in the middle of the head plate; If there are two injection mold groups, the injection mold groups are symmetrically installed on both sides of the injection lower frame and are respectively matched and connected with the interfaces on both sides of the head plate; The area between the interface in the middle of the head plate and the interfaces on both sides is the main reinforcement, and the area between the interfaces on both sides of the head plate and the side edges is the secondary reinforcement; The thickness of the main reinforcement is greater than the thickness of the auxiliary reinforcement, and the width of the main reinforcement is less than the width of the auxiliary reinforcement; The design process of the head plate is as follows: S100: Preliminarily determine the outer contour dimensions of the head plate according to the structural dimensions of the injection mold set; S200: Calculate the total force area of ​​the head plate according to the impact force of the injection die set and the clamping force of the die casting machine; S300: Based on the strength verification calculation of the head plate under the clamping force, the force-bearing area of ​​the head plate is preliminarily divided into the proportion of the main reinforcement and the secondary reinforcement; S400: The stress and strain analysis of the head plate is performed using finite element software to obtain the dimensional data of the main and secondary reinforcements with the minimum stress peak and minimum deformation.

2. The single-shot and double-shot die-casting machine according to claim 1, characterized in that: The thickness of the main reinforcement is 1.4 to 1.6 times the thickness of the secondary reinforcement; the width of the main reinforcement is 0.5 to 0.7 times the width of the secondary reinforcement.

3. The single-shot and double-shot die-casting machine according to claim 1, characterized in that: The shot lower frame comprises a connecting section, an oil tank and a mounting section which are arranged in sequence; The connecting section is fixedly connected to the clamping lower frame for mounting the head plate, the mounting section is used for mounting the injection mold assembly, and the oil tank is provided with three oil receiving ports along the width direction; If one of the injection modules is installed on the installation section, the injection module is connected to the middle oil receiving port; if a pair of the injection modules is installed on the installation section, the injection module is connected to the oil receiving ports on both sides.

4. The single-shot and double-shot die-casting machine according to claim 3, characterized in that: The oil tank is divided into a plurality of areas by a plurality of partitions arranged in a staggered manner horizontally and vertically; At least part of the partitions are provided with notches on their upper parts to allow air to circulate between the divided adjacent areas; At least part of the lower portion of the partition is provided with a notch to allow oil to flow between the divided adjacent areas.

5. The single-shot and double-shot die-casting machine according to claim 1, characterized in that: Step S200 includes the following process: S210: Calculate the clamping force F applied by the clamping cylinder to the head plate through the output pressure P of the clamping cylinder of the die casting machine and the piston rod diameter D of the clamping cylinder. S ; S220: Set the impact force F applied by the injection module to the head plate C ≤kF S , k represents the safety factor; S230: According to formula F C =P0·S, calculate the total force-bearing area S of the head plate; where P0 represents the output pressure of the injection cylinder of the injection module.

6. The single-shot and double-shot die-casting machine according to claim 5, characterized in that: The safety factor k is between 1.05 and 1.

15.

7. The single-shot and double-shot die-casting machine according to claim 1, characterized in that: Step S300 includes the following process: S310: Obtain the width dimension relationship between the main reinforcement and the secondary reinforcement according to the outer contour dimension of the head plate; S320: According to the structural distribution of the main reinforcement and the secondary reinforcement, all the load-bearing sections of the head plate are divided into dangerous sections; S330: Setting a benchmark and calculating the centroid according to the size and position of each dangerous section obtained in step S320; S340: Calculate the moment of inertia of each dangerous section about the centroid axis according to the centroid position expression obtained in step S330; S350: Substitute the obtained inertia moment expression into the bending moment calculation formula to derive the expression of the maximum bending stress at the dangerous section; S360: According to the limited clamping force and the safety stress of the material, the expression of the maximum bending stress is iterated to obtain the optimal width dimensions of the main and secondary ribs.

8. The single-shot and double-shot die-casting machine according to claim 7, characterized in that: Step S300 includes the following process: In step S330, for a vertically arranged head plate, a horizontal line passing through the center of the middle interface of the head plate is used as a reference, or a horizontal line passing through the centers of the interfaces on both sides of the head plate is used as a reference.

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