Double-layer oil pan and forming device thereof

Abstract

The present application discloses a double-layer oil pan and its forming device, belonging to the technical field of automobile parts and their processing equipment, and is used to provide a device capable of efficiently producing high-quality double-layer oil pans, including a base, on which a preheating table, a first-order die, a second-order die, a third-order die and a fourth-order die are arranged, the preheating table is suitable for heating the raw material blank; the base is connected to a lifting platform located above through a main pressure cylinder, the first-order die includes a pre-pressing fixed die connected to the base, and a first pressing frame connected to the lifting platform; the second-order die includes a shallow drawing die connected to the base, and a second pressing frame connected to the lifting platform; the third-order die includes a deep drawing die connected to the base; the fourth-order die includes a stamping die seat connected to the base, and a flat plate connected to the lifting platform. The present application designs multiple forming dies so that the forming device has multiple stations, and the raw material blank passes through these stations in turn and is gradually stretched, so that the extension direction of the material is more controllable and the forming process is more stable.

Description

Technical Field

[0001] The present application relates to the technical field of automobile parts and processing equipment thereof, and in particular to a double-layer oil pan and a molding device thereof. Background Art

[0002] The oil pan is equipped with moving parts and stores lubricating oil. The oil pan currently used in the market is made of a single-layer steel plate, and its performance does not meet the expected effects in terms of sound insulation, shock absorption and noise reduction.

[0003] The use of a multi-layer structure in the existing technology can improve the shock absorption and sound insulation performance, but each layer of material is relatively thin. If they are directly stacked together to form, due to the irregular shape of the product, which is usually composed of complex spatial curved surfaces, the stress and strain conditions at various locations during the drawing process are relatively complex and vary greatly. During the drawing process, cracking and local wrinkling are prone to occur. When the stretching height is large, the inner and outer layers of the material are stretched at different positions, and the material flow rates are different, making it extremely difficult to maintain the molding stability of the product. Summary of the invention

[0004] The purpose of the present application is to provide a device capable of efficiently producing high-quality double-layer oil pans.

[0005] To achieve the above purpose, the present application provides a double-layer oil pan: including an inner steel plate and an outer steel plate, wherein an interlayer is provided between the inner steel plate and the outer steel plate, and the inner steel plate, the interlayer and the outer steel plate can form an oil pan body, wherein the oil pan body includes a bottom plate, the edge of the bottom plate extends upward to form a side wall, the edge of the side wall extends outward to form a top plate, the edge of the top plate is bent downward to form a folded edge, the side wall of the oil pan body has reinforcing ribs, and the top plate of the oil pan body is also provided with connecting holes. The oil pan has good shock absorption and sound insulation functions, but the shape of the oil pan stamping part is irregular, and the requirements for cross-sectional flatness and hole position are relatively high, and it is a typical complex deep-drawn part.

[0006] In order to manufacture the double-layer oil pan, the present application also provides a molding device: comprising a base, on which a preheating table, a first-order mold body, a second-order mold body, a third-order mold body and a fourth-order mold body are arranged, the flat inner steel plate and the outer steel plate are bonded by the interlayer to form a raw material blank of the same flat shape, and the preheating table is suitable for heating the raw material blank; the base is connected to a lifting platform located above through a main pressure cylinder, the first-order mold body comprises a pre-pressing fixed mold connected to the base, and a first pressing frame connected to the lifting platform, the first pressing frame has a pre-pressing movable mold connected to the lifting platform through an auxiliary pressure cylinder; the second-order mold body comprises a pre-pressing fixed mold connected to the base The third-order die body comprises a deep drawing die connected to the base, and a third pressure frame connected to the lifting platform, wherein the third pressure frame has a deep pressure die connected to the lifting platform through an auxiliary pressure cylinder; the fourth-order die body comprises a stamping die base connected to the base, and a flat pressing plate connected to the lifting platform, wherein the flat pressing plate is outerly provided with a stamping die head connected to the lifting platform through an auxiliary pressure cylinder, and the material extension is smoother and the molding process is more stable.

[0007] As a preferred embodiment, the top surface of the pre-pressing fixed die is provided with a first positioning groove, the first pressure frame is suitable for pressing the edge of the raw material blank into the first positioning groove, the inner bottom surface of the first positioning groove is provided with a first folding cavity, the bottom surface of the pre-pressing fixed die is provided with a configuration cavity extending upward, and the pre-pressing fixed die is provided with an electric heating ring surrounding the transition between the first positioning groove and the first folding cavity in the configuration cavity; the top surface of the shallow drawing die is provided with a second positioning groove, the second pressure frame is suitable for pressing the edge of the raw material blank into the second positioning groove, the inner bottom surface of the second positioning groove is provided with a second folding cavity, the inner bottom surface of the second folding cavity is provided with a shallow cavity, the shape and size of the bottom surface of the shallow cavity are the same as the shape and size of the bottom surface of the oil pan body, the inner wall of the shallow cavity also has short ridges, the bottom surface of the shallow drawing die is provided with a configuration cavity extending upward, and the shallow drawing die has a configuration cavity in the configuration cavity An electric heating ring surrounding the shallow cavity is arranged inside; a third positioning groove is provided on the top surface of the deep drawing die, and the third pressure frame is suitable for pressing the edge of the raw material blank into the third positioning groove; a deep cavity is provided on the inner bottom surface of the third positioning groove, and the third positioning groove transitions to the deep cavity through an oblique groove, the shape and size of the bottom surface of the deep cavity are the same as the shape and size of the bottom surface of the shallow cavity, the inclination of the inner wall of the deep cavity is larger than the inclination of the inner wall of the shallow cavity, and the inner wall of the deep cavity also has long ridges, and the shape and inclination of the inner wall of the deep cavity are the same as the shape and inclination of the side wall of the oil pan body; an upwardly extending configuration cavity is provided on the bottom surface of the deep drawing die, and the deep drawing die is provided with an electric heating ring surrounding the oblique groove and the deep cavity in the configuration cavity, so as to heat the part of the raw material blank that needs to be deformed, improve the toughness and fluidity of the material, and reduce the probability of cracking due to excessive stress in the deformed part.

[0008] As a preferred embodiment, the stamping die seat is fixedly connected to the base through a base, the inner wall of the stamping die seat has positioning ridges, which are suitable for fitting with the inner wall of the reinforcing ribs of the sunken part of the raw material blank, the top of the stamping die seat has a folding table, which is suitable for cooperating with the flat pressing plate to form a top plate at the edge of the raw material blank, and the folding table is provided with stamping holes passing through the upper and lower surfaces; the bottom surface of the stamping die head has a folding frame, and the bottom surface of the stamping die head is also fixedly connected with a punching cone located in the folding frame, the number and position of the punching cones correspond to the punching holes, the punching cone is suitable for opening connecting holes on the top plate and passing through the corresponding stamping holes, the folding frame is suitable for cooperating with the folding table to form a folding edge, and cut off the part of the edge of the raw material blank located outside the folding edge, and putting the punching step in the last step can effectively avoid insufficient material during the stretching process.

[0009] As a preferred embodiment, the spacing between the bottom and side surfaces of the pre-pressing movable mold and the inner wall of the first folding cavity is equal to the thickness of the raw material blank; the spacing between the bottom and side surfaces of the shallow pressing mold and the inner wall of the shallow cavity is equal to the thickness of the raw material blank; the spacing between the bottom and side surfaces of the deep pressing mold and the inclined groove and the inner wall of the deep cavity is equal to the thickness of the raw material blank, so that sufficient expansion space is always reserved for the raw material blank, and the local thermal expansion of the technical raw material sheet will not affect the final molding state.

[0010] Preferably, the preheating table includes a heating plate, the upper surface of which is provided with a receiving groove, the bottom surface of which is provided with a mounting groove, the heating plate is provided with an electric heating plate in the mounting groove, and the bottom surface of the heating plate is also fixedly connected to a heat insulation plate; the top surfaces of the heating plate, the pre-pressing fixed die, the shallow drawing die and the deep drawing die are flush, the pre-pressing fixed die is fixedly connected to the base through a first pressure-bearing seat, the shallow drawing die is fixedly connected to the base through a second pressure-bearing seat, and the upper end surface of the fixed die is flush, which is convenient for taking and placing the raw material blanks.

[0011] As a preferred embodiment, it also includes a mold changing mechanism, which includes a pair of movable transport frames, each of which has a pair of parallel swing arms, and a synchronization plate is fixedly connected between the two swing arms. The sides of the pre-pressing fixed die, shallow drawing die and deep drawing die are all provided with a clearance groove connecting the inner cavity and extending to the top surface, which is suitable for the end of the swing arm to pass over and lift or put down the raw material blank, thereby realizing automatic position changing operation, with high safety and good stability, so that the molding device has higher output efficiency.

[0012] As a preferred embodiment, the mold changing mechanism has a pair of parallel guide rails, each of which is provided with a slider, and the slider includes a driving cabin, the driving cabin has a sliding channel running through both ends, suitable for the guide rails to pass through, and the side of the guide rail is also provided with a straight tooth groove, and a servo motor and a reducer are arranged in the driving cabin, and a gear is fixedly connected to the output end of the reducer, which is suitable for meshing with the straight tooth groove, and a configuration plate is fixedly connected to the top surface of the driving cabin, one end of the swing arm is rotatably connected to the configuration plate, and a wear-resistant strip is provided at the other end, and a cylinder is also connected between the swing arm and the configuration plate to provide transportation power to the swing arm.

[0013] As a preferred embodiment, an engagement groove is provided on the top of the configuration plate, an optical axis is inserted into the engagement groove, one end of the swing arm has a sleeve suitable for cooperating with the optical axis to form a rotating pair, the side of the configuration plate also has a lower articulated frame suitable for rotationally connecting with the lower end of the cylinder, the lower surface of the swing arm also has an upper articulated frame suitable for rotationally connecting with the upper end of the cylinder, thereby ensuring the freedom of movement of the cylinder itself.

[0014] As a preferred embodiment, the mold changing mechanism also has an electric telescopic rod located below the base, the telescopic rod end of the electric telescopic rod is connected to the base, the storage tube of the electric telescopic rod is fixedly connected with a linkage plate, the two ends of the guide rail are fixedly connected with guide plates, the base is provided with a guide hole running through the upper and lower surfaces, suitable for cooperating with the guide plate to form a sliding pair, the guide plate is connected to the linkage plate through the guide hole; the main pressure cylinder and the auxiliary pressure cylinder both adopt hydraulic cylinders that can perform telescopic movement, and the base is also provided with a slag discharge port running through the upper and lower surfaces, which is convenient for centralized collection and processing of scraps produced by stamping.

[0015] Compared with the prior art, the beneficial effects of this application are:

[0016] (1) By designing multiple molding dies, the molding device has multiple workstations. The raw material blank passes through these workstations in turn and is gradually extended and stretched. The extension direction of the material is more controllable and the molding process is more stable.

[0017] (2) By setting a heating component in each mold body, the parts of the raw material blank that may be deformed are heated, so that the deformed material has better toughness and fluidity, and the force on the material is more easily dispersed during stretching, effectively reducing the probability of cracking during the stretching process.

[0018] (3) By setting a pressure frame structure outside the movable mold, the edge of the raw material blank is pressed tightly. The position of the raw material blank on all four sides before stretching is restricted. The movable mold only directly applies pressure to the part of the raw material blank that can form an oil pan, and the part of the raw material blank that can form an oil pan is restrained by the material on the edge. In this way, the raw material blank can fit the inner wall of the fixed mold more smoothly, reducing the probability of wrinkling during the stretching process.

[0019] (4) A composite double-layer steel sandwich material is made by coating special glue between two steel plates to serve as the raw material blank of the oil pan. The interlayer can effectively hinder the vibration transmission between the steel plates, so that the oil pan made of the raw material blank has better strength and toughness, and can achieve better effects in shock absorption and sound insulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the first three-dimensional structure of the double-layer oil pan.

[0021] Figure 2 This is a simplified diagram showing the layered structure of the double-layer oil sump.

[0022] Figure 3 It is a second three-dimensional structural schematic diagram of the double-layer oil pan.

[0023] Figure 4 It is a third three-dimensional structural schematic diagram of the double-layer oil pan.

[0024] Figure 5 It is a first stereoscopic schematic diagram of the overall structure of the double-layer oil pan molding device.

[0025] Figure 6 It is a second stereoscopic schematic diagram of the overall structure of the double-layer oil pan molding device.

[0026] Figure 7 It is a schematic diagram of the first three-dimensional structure of all fixed molds of the double-layer oil pan molding device arranged on the base.

[0027] Figure 8 It is a second three-dimensional structural schematic diagram of all fixed molds of the double-layer oil pan molding device arranged on the base.

[0028] Fig. 9 It is a schematic diagram of the three-dimensional structure of the double-layer oil pan molding device in which all fixed molds are arranged side by side.

[0029] Fig.10 For the double-layer oil pan molding device Fig. 9 A partial enlarged view of point A.

[0030] Fig.11 It is a first three-dimensional structural cross-sectional view of the double-layer oil pan molding device in which all fixed molds are arranged side by side.

[0031] Fig.12 For the double-layer oil pan molding device Fig.11 A partial enlarged view of point B.

[0032] Fig.13 For the double-layer oil pan molding device Fig.11 A partial enlarged view of point C.

[0033] Fig.14 It is a second three-dimensional structural cross-sectional view of the double-layer oil pan molding device in which all fixed molds are arranged side by side.

[0034] Fig.15 For the double-layer oil pan molding device Fig.14 A partial enlarged view of point D.

[0035] Fig.16 For the double-layer oil pan molding device Fig.14 A partial enlarged view of point E.

[0036] Fig.17 It is a schematic diagram of the three-dimensional structure of the stamping die base of the double-layer oil pan forming device.

[0037] Fig.18 It is a first three-dimensional structural schematic diagram of all movable molds of the double-layer oil pan molding device arranged on a lifting platform.

[0038] Fig.19 It is a second three-dimensional structural schematic diagram of all movable molds of the double-layer oil pan molding device arranged on the lifting platform.

[0039] Fig. 20 It is a schematic diagram of the three-dimensional structure of the connection between the punching die head and the auxiliary pressure cylinder of the double-layer oil pan forming device.

[0040] Fig.21 It is a schematic diagram of the three-dimensional structure of the connection between the pre-pressing movable mold and the auxiliary pressure cylinder of the double-layer oil pan molding device.

[0041] Fig. 22 It is a first three-dimensional structural schematic diagram of the connection between the lifting platform and the mold changing mechanism of the double-layer oil pan molding device and the base.

[0042] Fig.23 It is a second three-dimensional structural schematic diagram of the connection between the lifting platform and the mold changing mechanism of the double-layer oil pan molding device and the base.

[0043] Fig.24 It is a schematic diagram of the first three-dimensional structure of the transport frame of the double-layer oil pan molding device configured on the slider.

[0044] Fig.25 It is a second three-dimensional structural schematic diagram of the transport frame of the double-layer oil pan molding device configured on the slider.

[0045] Fig.26 It is a schematic diagram of the three-dimensional structure of the connection between the cylinder and the slider of the double-layer oil pan molding device.

[0046] Fig. 27 It is a first three-dimensional structural schematic diagram of the transport frame of the double-layer oil pan molding device.

[0047] Fig.28 It is a second three-dimensional structural schematic diagram of the transport frame of the double-layer oil pan molding device.

[0048] In the figure: 1. oil pan body; 101. inner steel plate; 102. interlayer; 103. outer steel plate; 104. bottom plate; 105. side wall; 106. reinforcing rib; 107. top plate; 108. folded edge; 109. connecting hole; 2. base; 201. guide hole; 202. slag discharge port; 3. lifting platform; 4. mold changing mechanism; 401. electric telescopic rod; 402. linkage plate; 403. guide plate; 404. guide rail; 450. slider; 451, drive cabin; 452, slideway; 453, configuration plate; 454, lower articulated frame; 455, bite groove; 456, optical axis; 460, transport frame; 461, swing arm; 462, synchronization plate; 463, shaft sleeve; 464, upper articulated frame; 465, wear strip; 407, cylinder; 5, preheating table; 501, heat insulation board; 520, heating plate; 521, receiving groove; 522, installation groove; 6, first-order mold body; 601, first pressure bearing seat; 610, pre-pressing fixed die; 611, first positioning groove; 612, first folding cavity; 602, first pressure frame; 620, pre-pressing movable die; 7, second-order die body; 701, second pressure seat; 710, shallow drawing die; 711, second positioning groove; 712, second folding cavity; 713, shallow cavity; 714, short rib; 702, second pressure frame; 720, shallow pressing die; 8, third-order die body; 810, deep drawing die; 811, third positioning groove; 812, oblique Groove; 813, deep cavity; 814, long rib; 802, third pressure frame; 820, deep pressing die; 9, fourth-order die body; 901, base; 910, stamping die base; 911, positioning rib; 912, folding table; 913, stamping hole; 902, flat plate; 920, stamping die head; 921, punching cone; 922, folding frame; 10, main pressure cylinder; 11, give way groove; 12, configuration cavity; 13, electric heating plate; 14, electric heating ring; 15, auxiliary pressure cylinder. DETAILED DESCRIPTION

[0049] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0050] 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, which 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 orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0051] 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.

[0052] 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.

[0053] like Figure 1-4 The double-layer oil pan shown in the figure comprises an inner steel plate 101 and an outer steel plate 103. Both steel plates are usually made of 0.75 mm thick DC06 steel plates. An interlayer 102 is provided between the inner steel plate 101 and the outer steel plate 103 to form a sandwich structure. Although the thickness of the interlayer 102 is obviously thinner than the steel plate, the inner steel plate 101 and the outer steel plate 103 are stably fixed together because the special adhesive material used in the interlayer 102 has a strong adhesion ability. Moreover, the special adhesive has a certain The soft elasticity can effectively absorb vibration and hinder the spread of noise. The special glue also has heat fluidity and can produce obvious adaptive deformation during hot pressing. The inner steel plate 101, the interlayer 102 and the outer steel plate 103 can form the oil pan body 1 under the action of stamping and stretching. The specific structure of the oil pan body 1 includes a bottom plate 104. The bottom plate 104 needs to be provided with an oil drain port for configuring the oil drain bolts, nuts and sealing gaskets. The edge of the bottom plate 104 extends upward to form a side wall 105. The side wall The diameter of the side wall 105 increases monotonically from bottom to top, the edge of the side wall 105 extends outward to form a top plate 107, and the various parts of the top plate 107 are in the same horizontal plane and form a closed structure in the horizontal plane. Most of the bottom plate 104 is parallel to the top plate 107, and the edge of the top plate 107 is bent downward to form a folded edge 108, which can improve the bending resistance of the top plate 107. The side wall 105 of the oil pan body 1 has a reinforcing rib 106, which is used to improve the structural strength of the side wall 105 and make it have higher deformation resistance. In order to make the inner and outer walls of the oil pan smooth and continuous, the reinforcing rib 106 is designed to be arc-shaped, the concave side of the arc is the inner wall of the reinforcing rib 106, and the convex side of the arc is the outer wall of the reinforcing rib 106. In this embodiment, the outer wall of the reinforcing rib 106 is flush with the inner wall of the oil pan body 1, that is, the inner wall of the side wall 105. The top plate 107 of the oil pan body 1 is also provided with connecting holes 109 for bolts and other connecting parts to pass through, so as to fix the entire double-layer oil pan and the upper cover structure to form a complete transmission housing.

[0054] like Figure 5-28The forming device of the double-layer oil pan shown in the figure, it should be noted that the flat inner steel plate 101 and the outer steel plate 103 are bonded by the interlayer 102 to form a raw material blank of the same flat shape, which is the object of the forming device. The forming device includes a fixed base 2, and the base 2 is connected to a lifting platform 3 located above through a main pressure cylinder 10, and the lifting platform 3 is parallel to the base 2. The main pressure cylinder 10 adopts a hydraulic cylinder capable of telescopic movement. The telescopic rod and the cylinder barrel of the hydraulic cylinder are fixedly connected to the lifting platform 3 and the base 2 respectively. The hydraulically driven main pressure cylinder 10 can provide strong upward thrust and downward pressure, and the movement process is very smooth and stable. A preheating table 5, a first-order mold 6, a second-order mold 7, a third-order mold 8 and a fourth-order mold 9 are also provided on the base 2, corresponding to the five stations in the forming device. Under normal circumstances, the preheating table 5, the first-order mold 6, the second-order mold 7, the third-order mold 8 and the fourth-order mold 9 are arranged from front to back along a straight line.

[0055] The preheating table 5 is used to heat the raw material blank, so that the steel plate undergoes slight thermal expansion, thereby improving the toughness of the steel plate and improving the flowability of the steel plate material and the characteristic adhesive material of the interlayer 102. The preheating table 5 includes a horizontally placed heating plate 520. A receiving groove 521 is provided on the upper surface of the heating plate 520. The inner bottom surface of the receiving groove 521 is not higher than the upper surface of the raw material blank conveyor belt, and is used to provide initial positioning for the raw material blank flying out of the conveyor belt to enter the forming device. A mounting groove 522 is provided on the bottom surface of the heating plate 520. The inner top surface of the mounting groove 522 is not far from the inner bottom surface of the receiving groove 521. The heating plate 520 is provided with an electric heating plate 13 in the mounting groove 522, and the electric heating effect is used to heat the raw material blank in the receiving groove 521. The bottom surface of the heating plate 520 is also fixedly connected with a heat insulation plate 501, which is used to shield the electric heating plate 13 to reduce the loss of useless heat, which can effectively reduce energy consumption in actual work.

[0056] The first-order mold body 6 includes a pre-pressing fixed mold 610 connected to the base 2, and a first pressing frame 602 fixedly connected to the lifting platform 3. The first pressing frame 602 has a pre-pressing movable mold 620 connected to the lifting platform 3 through an auxiliary pressure cylinder 15. The auxiliary pressure cylinder 15 also adopts a retractable hydraulic cylinder. The cylinder end of the hydraulic cylinder is fixedly connected to the lifting platform 3, and the telescopic rod end of the hydraulic cylinder is fixedly connected to the pre-pressing movable mold 620. The hydraulic pressure can apply a strong downward pressure and upward pulling force to the pre-pressing movable mold 620, thereby achieving stable mold closing, stretching and mold separation. The top surface of the pre-pressing fixed mold 610 is provided with a first positioning groove 611. The first pressing frame 602 can press the edge of the raw material blank that is heated up by the heating plate 520 tightly against the first fixed mold. In the positioning groove 611, the inner bottom surface of the first positioning groove 611 is provided with a sunken first folding cavity 612, and the distance between the bottom and side surfaces of the pre-pressing movable mold 620 and the inner wall of the first folding cavity 612 is equal to the thickness of the raw material blank. When the pre-pressing movable mold 620 descends and is molded with the pre-pressing fixed mold 610, the middle part of the raw material blank will be stretched downward to fit the inner wall of the first folding cavity 612. In order to prevent the temperature of the raw material blank from dropping during the deformation process, an upwardly extending configuration cavity 12 is also provided on the bottom surface of the pre-pressing fixed mold 610, and an electric heating ring 14 is arranged in the configuration cavity 12 around the transition between the first positioning groove 611 and the first folding cavity 612, so as to maintain the material toughness and fluidity of the main deformation part of the raw material blank during the first stretching process.

[0057] The second-order die body 7 includes a shallow drawing die 710 connected to the base 2, and a second pressing frame 702 fixedly connected to the lifting platform 3. The second pressing frame 702 has a shallow pressing die 720 connected to the lifting platform 3 through an auxiliary pressure cylinder 15. The top surface of the shallow drawing die 710 is provided with a second positioning groove 711. The second pressing frame 702 is used to press the edge of the raw material blank after being stretched by the first-order die body 6 into the second positioning groove 711. The inner bottom surface of the second positioning groove 711 is provided with a second folding cavity 712. The sinking part of the raw material blank from the first-order die body 6 is just matched with the second folding cavity 712. The inner bottom surface of the second folding cavity 712 is provided with a shallow cavity 713. The shape and size of the bottom surface of the shallow cavity 713 are the same as the shape and size of the bottom surface of the oil pan body 1, and can be directly formed. The bottom plate 104 structure of the oil pan, the spacing between the bottom and side surfaces of the shallow pressing die 720 and the inner wall of the shallow cavity 713 is equal to the thickness of the raw material blank, and the inner wall of the shallow cavity 713 also has a short rib 714. During the process of the shallow pressing die 720 descending and closing with the shallow drawing die 710, the sunken part of the raw material blank can initially form the side wall 105 and the reinforcing rib 106 structure of the oil pan body 1. At this time, the depth of the sunken part of the raw material blank is increased, but it is still less than the depth of the side wall 105 of the finished oil pan. Similarly, in order to avoid the cooling of the raw material blank during the second stretching process, an upwardly extending configuration cavity 12 is also opened on the bottom surface of the shallow drawing die 710, and an electric heating ring 14 surrounding the shallow cavity 713 is arranged in the configuration cavity 12 to maintain the material toughness and fluidity of the main deformation parts of the raw material blank.

[0058] The third-order die body 8 includes a deep drawing die 810 connected to the base 2, and a third pressing frame 802 fixedly connected to the lifting platform 3. The third pressing frame 802 has a deep pressing die 820 connected to the lifting platform 3 through a hydraulically driven auxiliary pressure cylinder 15. The cylinder end of the auxiliary pressure cylinder 15 is fixedly connected to the lifting platform 3, and the telescopic rod end of the auxiliary pressure cylinder 15 is fixedly connected to the deep pressing die 820. The top surface of the deep drawing die 810 is provided with a third positioning groove 811. The third pressing frame 802 is used to press the edge of the raw material blank after being stretched by the second-order die body 7. In the third positioning groove 811, a deep cavity 813 is provided on the inner bottom surface of the third positioning groove 811. It should be noted that, since the depth of the deep cavity 813 is at least 1.5 times the depth of the shallow cavity 713, the third positioning groove 811 needs to transition to the deep cavity 813 through the oblique groove 812 to release a portion of the edge of the raw material blank that was originally pressed to supplement the material for forming the side wall 105 of the oil pan body 1. The shape and size of the bottom surface of the deep cavity 813 are the same as those of the bottom surface of the shallow cavity 713, but the oblique groove 812 of the inner wall of the deep cavity 813 is The inner wall of the deep cavity 813 has a greater inclination than that of the shallow cavity 713. The greater inclination is to adapt to the deeper bottom of the deep cavity 813. The inner wall of the deep cavity 813 also has a long rib 814, which can perfectly fit the inner wall of the reinforcing rib 106 of the finished side wall 105 of the oil pan. That is to say, the shape and inclination of the inner wall of the deep cavity 813 are exactly the same as the shape and inclination of the side wall 105 of the oil pan body 1. The bottom and side of the deep die 820 are spaced from the oblique groove 812 and the inner wall of the deep cavity 813 by the thickness of the raw material blank. When the deep die 820 descends and the deep drawing After the mold 810 is closed, the raw material blank, except for the part pressed by the third pressure frame 802, the remaining sunken part will be stretched into the same shape and size as the finished bottom plate 104 and side wall 105 of the oil pan. In order to ensure the temperature of the sunken part of the raw material sheet during the last stretching process, the bottom surface of the deep drawing die 810 will also be provided with an upwardly extending configuration cavity 12, and an electric heating ring 14 surrounding the oblique groove 812 and the deep cavity 813 is arranged in the configuration cavity 12, so as to ensure the toughness and fluidity of the sunken part of the raw material blank during the third stretching process.

[0059] The fourth-order die body 9 includes a stamping die base 910 connected to the base 2, and a flat plate 902 connected to the lifting platform 3. The flat plate 902 is covered with a stamping die head 920 connected to the lifting platform 3 through an auxiliary pressure cylinder 15. The stamping die head 920 is a frame plate with an opening in the middle. The inner wall of the stamping die head 920 can perfectly fit with the outer side of the flat plate 902. The stamping die base 910 is fixedly connected to the base 2 through a base 901. The inner wall of the stamping die base 910 has a positioning rib 911 for The inner wall of the reinforcing rib 106 of the sinking part of the raw material blank coming from the third-order die body 8 is matched, thereby constraining the raw material blank after three stretchings. At this time, the raw material blank is almost a semi-finished product, and the last step of punching off the excess material on the edge is left. The top of the stamping die seat 910 has a folding table 912 for supporting the horizontal edge of the semi-finished product. The edge of the folding table 912 obviously exceeds the outer side of the main part of the stamping die seat 910, and is used to cooperate with the flat pressing plate 902 to form a folding plate on the edge of the raw material blank. In the top plate 107 of the finished oil pan, the folding platform 912 is provided with a punching hole 913 that passes through the upper and lower surfaces, and the bottom surface of the punching die 920 is provided with a folding frame 922, which is a frame plate shape similar to the folding platform 912. The bottom surface of the punching die 920 is also fixedly connected with a punching cone 921 located in the folding frame 922. The number and position of the punching cone 921 correspond to the punching hole 913. The punching cone 921 is used to open a continuous hole on the top plate 107 of the semi-finished product. The connecting hole 109 passes through the corresponding punching hole 913. When the punching die 920 descends to the bottom, the bottom edge of the inner wall of the folding frame 922 cooperates with the top edge of the outer side of the folding platform 912 to hinge the top plate 107 of the semi-finished product to form a folding edge 108, and the portion of the edge of the raw material blank located outside the folding edge 108 is cut off. The base 2 is also provided with a slag discharge port 202 that passes through the upper and lower surfaces. The punched scraps can flow from the slag discharge port 202 to the waste box for centralized recycling and treatment.

[0060] The double-layer oil pan forming device is also equipped with a die-changing mechanism 4 for moving the raw material blank from one station to another. In order to facilitate the operation of the die-changing mechanism 4, the top surfaces of the heating plate 520, the pre-pressing fixed die 610, the shallow drawing die 710 and the deep drawing die 810 are flush. However, since the thickness of the pre-pressing fixed die 610 and the shallow drawing die 710 is different from that of the deep drawing die 810, the pre-pressing fixed die 610 is fixedly connected to the base 2 through the first pressure-bearing seat 601, and the shallow drawing die 710 is fixedly connected to the base 2 through the second pressure-bearing seat 701. The pressure seat is equivalent to a cushion block to compensate for the height difference between the pre-pressing fixed die 610, the shallow drawing die 710 and the deep drawing die 810. The structure 4 includes a pair of movable transport racks 460, and the two transport racks 460 are symmetrically arranged about any one or two adjacent ones of the heating plate 520, the pre-pressing fixed die 610, the shallow drawing die 710 and the deep drawing die 810. Each transport rack 460 has a pair of parallel swing arms 461, and a synchronization plate 462 is fixedly connected between the two swing arms 461 to ensure the consistency of the steps of the two swing arms 461. The sides of the pre-pressing fixed die 610, the shallow drawing die 710 and the deep drawing die 810 are all provided with a clearance groove 11 that connects to the inner cavity and extends to the top surface, which is used for the end of the swing arm 461 to pass over and lift or put down the raw material blank, thereby realizing the movement of the raw material blank from one station to another.

[0061] The die-changing mechanism 4 has a pair of parallel guide rails 404, and the extension direction of the two guide rails 404 is consistent with the arrangement direction of the heating plate 520, the pre-pressing fixed die 610, the shallow drawing die 710 and the deep drawing die 810. A slider 450 is arranged on each guide rail 404, and the main part of the slider 450 is a driving cabin 451. The driving cabin 451 has a sliding channel 452 running through both ends for the guide rail 404 to pass through, and the side of the guide rail 404 is also provided with a straight tooth groove, and a servo motor and a reducer are arranged in the driving cabin 451. The servo motor drives the reducer, and the output end of the reducer is fixedly connected with a gear, which is meshed with the straight tooth groove in the sliding channel 452, and has a high transmission accuracy. Therefore, the servo motor can adjust and control the position of the slider 450 on the guide rail 404, and the top surface of the driving cabin 451 is fixedly connected with a configuration plate 453, one end of the swing arm 461 is rotatably connected to the configuration plate 453, and the other end is provided with a Wear-resistant strip 465 is made of high temperature resistant rubber material and directly contacts with the raw material blank, which can effectively prevent the swing arm 461 from contacting and scratching the raw material blank. A cylinder 407 is also connected between the swing arm 461 and the configuration plate 453 to drive the swing arm 461 to rotate. Specifically, a bite groove 455 is opened on the top of the configuration plate 453. There are two bite grooves 455, corresponding to the number of the swing arm 461. The configuration plate 453 is in the bite groove 455. An optical axis 456 is inserted, and the axes of the two optical axes 456 are collinear. One end of the swing arm 461 has a sleeve 463 for being inserted with the optical axis 456 to form a rotating pair. The side of the configuration plate 453 also has a lower articulated frame 454 for being rotatably connected to the lower end of the cylinder 407. The lower surface of the swing arm 461 also has an upper articulated frame 464 for being rotatably connected to the upper end of the cylinder 407, so that the cylinder 407 can make adaptive deflection when performing telescopic movement.

[0062] The mold changing mechanism 4 also has an electric telescopic rod 401 located below the base 2. Two electric telescopic rods 401 are usually provided. The telescopic rod end of each electric telescopic rod 401 is connected to the base 2, and the storage tube of the electric telescopic rod 401 is fixedly connected to the linkage plate 402. The two ends of the guide rail 404 are fixedly connected to the guide plates 403. The base 2 is provided with a guide hole 201 that passes through the upper and lower surfaces, which is used to cooperate with the guide plate 403 to form a sliding pair. The guide plate 403 passes through the guide hole 201 and is connected to the linkage plate 402, so that the height of the guide rail 404 can be changed. After the horizontal swing arm 461 lifts the raw material blank from the workstation, it rises again driven by the electric telescopic rod 401 and completely leaves the sinking cavity of the workstation, thereby avoiding interference with other components during horizontal transfer of the raw material blank.

[0063] Working principle: Since the first pressing frame 602, the second pressing frame 702, the third pressing frame 802 and the flat plate 902 are all fixedly connected to the lifting platform 3, the five stations of the forming device can work simultaneously. Under the control of the computer, the mold changing mechanism 4 can quickly move the raw material blank on one station to the next adjacent station. The raw material blank located in the first-order mold body 6 is first pressed by the first pressing frame 602, and the pre-pressing movable mold 620 is then moved to stretch the raw material blank for the first time; the raw material blank located in the second-order mold body 7 is also first pressed by the second pressing frame 702, and the shallow pressing mold 720 is then moved to stretch the raw material blank for the second time; the raw material blank located in the third-order mold body 8 is also pressed by the second pressing frame 702, and the shallow pressing mold 720 is then moved to stretch the raw material blank for the second time; the raw material blank located in the third-order mold body 8 is also pressed by the second pressing frame 702, and the shallow pressing mold 720 is then moved to stretch the raw material blank for the second time. It is first pressed by the third pressing frame 802, and then the deep pressing die 820 is moved to stretch the raw material blank for the third time to obtain a semi-finished product of the double-layer oil pan; the semi-finished product located in the fourth-order mold body 9 is first pressed by the flat pressing plate 902, and the top of the semi-finished product is flattened, and then the stamping die head 920 descends to stamp the top plate 107 of the finished product to remove excess material, and bend the edge of the top plate 107 to form a folded edge 108. The thickness of the interlayer 102 at the folded edge 108 is compressed to the extreme, and the inner steel plate 101 and the outer steel plate 103 are closer to each other, realizing the edge sealing function, and after cooling, a double-layer oil pan finished product with smooth stretching, smooth inner and outer walls, and aligned inner and outer steel plates at the edge can be obtained.

[0064] 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 molding device for manufacturing a double-layer oil pan, characterized in that: The double-layer oil pan comprises an inner steel plate (101) and an outer steel plate (103), wherein an interlayer (102) is provided between the inner steel plate (101) and the outer steel plate (103), wherein the inner steel plate (101), the interlayer (102) and the outer steel plate (103) can form an oil pan body (1), wherein the oil pan body (1) comprises a bottom plate (104), wherein an edge of the bottom plate (104) extends upwards to form a side wall (105), and an edge of the side wall (105) extends outwards to form a top plate (107), wherein The edge of the top plate (107) is bent downward to form a folded edge (108), the side wall (105) of the oil pan body (1) has a reinforcing rib (106), and the top plate (107) of the oil pan body (1) is also provided with a connecting hole (109); the molding device comprises a base (2), the base (2) is provided with a preheating table (5), a first-order mold body (6), a second-order mold body (7), a third-order mold body (8) and a fourth-order mold body (9), the inner steel plate (101) and the outer steel plate (103) are flat and are covered by the interlayer (102) are bonded to form a raw material blank of the same flat shape, and the preheating table (5) is suitable for heating the raw material blank; the base (2) is connected to a lifting platform (3) located above through a main pressure cylinder (10), and the first-stage mold body (6) includes a pre-pressing fixed mold (610) connected to the base (2), and a first pressing frame (602) connected to the lifting platform (3), the top surface of the pre-pressing fixed mold (610) is provided with a first positioning groove (611), and the first pressing frame (602) is suitable for pressing the edge of the raw material blank tightly against the first A positioning groove (611) is provided with a first folding cavity (612) on the inner bottom surface of the first positioning groove (611); a configuration cavity (12) extending upward is provided on the bottom surface of the pre-pressing fixed mold (610); an electric heating ring (14) surrounding the transition between the first positioning groove (611) and the first folding cavity (612) is provided in the configuration cavity (12) of the pre-pressing fixed mold (610); and a pre-pressing movable mold (620) connected to the lifting platform (3) via an auxiliary pressure cylinder (15) is provided in the first pressing frame (602);The second-order mold body (7) comprises a shallow drawing die (710) connected to the base (2), and a second pressing frame (702) connected to the lifting platform (3); a second positioning groove (711) is provided on the top surface of the shallow drawing die (710); the second pressing frame (702) is suitable for pressing the edge of the raw material blank into the second positioning groove (711); a second folding cavity (712) is provided on the inner bottom surface of the second positioning groove (711); a shallow mold cavity (713) is provided on the inner bottom surface of the second folding cavity (712); the shape and size of the bottom surface of the shallow mold cavity (713) are the same as the shape and size of the bottom surface of the oil pan body (1); the shallow mold cavity (713) The inner wall of the shallow drawing die (710) also has short ridges (714); the bottom surface of the shallow drawing die (710) is provided with a configuration cavity (12) extending upward; the shallow drawing die (710) is provided with an electric heating ring (14) surrounding the shallow cavity (713) in the configuration cavity (12); the second pressing frame (702) has a shallow pressing die (720) connected to the lifting platform (3) via an auxiliary pressure cylinder (15); the third pressing frame (802) is connected to the lifting platform (3); the deep drawing die (810) is provided with a third positioning groove (811) on the top surface; the third pressing frame (802) is suitable for The edge of the raw material blank is pressed tightly into the third positioning groove (811); a deep cavity (813) is provided on the inner bottom surface of the third positioning groove (811); the third positioning groove (811) transitions to the deep cavity (813) through an inclined groove (812); the shape and size of the bottom surface of the deep cavity (813) are the same as the shape and size of the bottom surface of the shallow cavity (713); the slope of the inner wall of the deep cavity (813) is greater than the slope of the inner wall of the shallow cavity (713); the inner wall of the deep cavity (813) also has a long ridge (814); the shape and slope of the inner wall of the deep cavity (813) are the same as the shape and slope of the side wall (105) of the oil pan body (1). Similarly, the bottom surface of the deep drawing die (810) is provided with a configuration cavity (12) extending upward, and the deep drawing die (810) is provided with an electric heating ring (14) surrounding the oblique groove (812) and the deep cavity (813) in the configuration cavity (12), and the third pressing frame (802) has a deep pressing die (820) connected to the lifting platform (3) through an auxiliary pressure cylinder (15); the fourth-order die body (9) includes a stamping die seat (910) connected to the base (2), and a flat pressing plate (902) connected to the lifting platform (3), and the flat pressing plate (902) is covered with a stamping die head (920) connected to the lifting platform (3) through an auxiliary pressure cylinder (15). ; 2. The double-layer oil pan forming device as claimed in claim 1, characterized in that: The stamping die seat (910) is fixedly connected to the base (2) via a base (901); the inner wall of the stamping die seat (910) has a positioning ridge (911) suitable for fitting with the inner wall of the reinforcing rib (106) of the sinking portion of the raw material blank; the top of the stamping die seat (910) has a folding platform (912) suitable for cooperating with the flat plate (902) to form a top plate (107) at the edge of the raw material blank; the folding platform (912) is provided with a stamping hole (913) that passes through the upper and lower surfaces; the bottom surface of the stamping die head (920) has a folding frame (911) 22), the bottom surface of the punching die head (920) is also fixedly connected to a punching cone (921) located in the folding frame (922), the number and position of the punching cones (921) correspond to the punching holes (913), the punching cones (921) are suitable for opening connecting holes (109) on the top plate (107) and passing through the corresponding punching holes (913), the folding frame (922) is suitable for cooperating with the folding table (912) to form a folding edge (108), and cutting off the portion of the edge of the raw material blank located outside the folding edge (108).

3. The double-layer oil pan forming device according to claim 2, characterized in that: The spacing between the bottom and side surfaces of the pre-pressing movable die (620) and the inner wall of the first folding cavity (612) is equal to the thickness of the raw material blank; the spacing between the bottom and side surfaces of the shallow pressing die (720) and the inner wall of the shallow cavity (713) is equal to the thickness of the raw material blank; and the spacing between the bottom and side surfaces of the deep pressing die (820) and the inner wall of the inclined groove (812) and the deep cavity (813) is equal to the thickness of the raw material blank.

4. The double-layer oil pan forming device according to claim 3, characterized in that: The preheating table (5) comprises a heating plate (520), the upper surface of the heating plate (520) being provided with a receiving groove (521), the bottom surface of the heating plate (520) being provided with a mounting groove (522), the heating plate (520) being provided with an electric heating plate (13) in the mounting groove (522), and the bottom surface of the heating plate (520) being fixedly connected with a heat insulation plate (501).

5. The double-layer oil pan forming device according to claim 4, characterized in that: The top surfaces of the heating plate (520), the pre-pressing fixed die (610), the shallow drawing die (710) and the deep drawing die (810) are flush; the pre-pressing fixed die (610) is fixedly connected to the base (2) via a first pressure-bearing seat (601); and the shallow drawing die (710) is fixedly connected to the base (2) via a second pressure-bearing seat (701).

6. The double-layer oil pan forming device according to any one of claims 1 to 5, characterized in that: The invention also comprises a die-changing mechanism (4), wherein the die-changing mechanism (4) comprises a pair of movable transport frames (460), each of the transport frames (460) having a pair of parallel swing arms (461), a synchronization plate (462) being fixedly connected between the two swing arms (461), and the sides of the pre-pressing fixed die (610), the shallow drawing die (710) and the deep drawing die (810) are all provided with a clearance groove (11) communicating with the inner cavity and extending to the top surface, suitable for the end of the swing arm (461) to pass over and lift or put down the raw material blank.

7. The double-layer oil pan forming device according to claim 6, characterized in that: The mold changing mechanism (4) has a pair of parallel guide rails (404), each of which is provided with a slider (450), the slider (450) comprising a driving cabin (451), the driving cabin (451) having a sliding channel (452) penetrating both ends and suitable for the guide rails (404) to pass through, the side of the guide rails (404) also having a straight tooth groove, the driving cabin (451) having a servo motor and a reducer, the output end of the reducer being fixedly connected to a gear suitable for meshing with the straight tooth groove, the top surface of the driving cabin (451) being fixedly connected to a configuration plate (453), one end of the swing arm (461) being rotatably connected to the configuration plate (453), and the other end being provided with a wear-resistant strip (465), and a cylinder (407) being connected between the swing arm (461) and the configuration plate (453).

8. The double-layer oil pan forming device according to claim 7, characterized in that: The top of the configuration plate (453) is provided with an engagement groove (455), and the configuration plate (453) is inserted with an optical axis (456) in the engagement groove (455). One end of the swing arm (461) has a shaft sleeve (463) suitable for cooperating with the optical axis (456) to form a rotating pair. The side of the configuration plate (453) also has a lower hinge frame (454) suitable for being rotatably connected to the lower end of the cylinder (407). The lower surface of the swing arm (461) also has an upper hinge frame (464) suitable for being rotatably connected to the upper end of the cylinder (407).

9. The double-layer oil pan forming device according to claim 8, characterized in that: The mold changing mechanism (4) further comprises an electric telescopic rod (401) located below the base (2); the end of the electric telescopic rod (401) is connected to the base (2); the storage tube of the electric telescopic rod (401) is fixedly connected to a linkage plate (402); both ends of the guide rail (404) are fixedly connected to guide plates (403); the base (2) is provided with a guide hole (201) passing through the upper and lower surfaces, which is suitable for cooperating with the guide plate (403) to form a sliding pair; the guide plate (403) passes through the guide hole (201) and is connected to the linkage plate (402).

10. The double-layer oil pan forming device according to claim 9, characterized in that: The main pressure cylinder (10) and the auxiliary pressure cylinder (15) are both hydraulic cylinders capable of telescopic movement, and the base (2) is also provided with a slag discharge port (202) that passes through the upper and lower surfaces.

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