Spoke intelligent stamping processing combined die

Abstract

The present application relates to the technical field of spoke stamping die, in particular to a combined die for spoke intelligent stamping, which comprises a lower die seat, the upper surface of the lower die seat is fixedly connected with a female die, the upper part of the lower die seat is provided with an upper die seat, the upper surface of the lower die seat is fixedly connected with a plurality of No.1 sleeves, and each of the plurality of No.1 sleeves is slidably connected with a No.1 connecting rod. The stamping speed self-adaptive assembly is capable of realizing self-adaptive adjustment of speed and stability according to different stamping characteristics of thick plates and thin plates, the self-adaptive adjustment assembly is capable of realizing automatic detection of plate thickness and convenient control of stamping parameters, the die cooling assembly is capable of efficiently cooling the die, the cooling start-stop control assembly is capable of realizing automatic start-stop of the cooling system, and the cooling frequency adjustment assembly is capable of flexibly adjusting the cooling frequency according to the plate thickness.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spoke stamping die, in particular to a combined die for intelligent spoke stamping. BACKGROUND

[0002] As the core load-bearing component of the wheel to transmit power and bear load, spoke directly connects the hub and rim, and needs to bear the weight of the vehicle body, ground impact force and torque and other complex stresses during vehicle driving. The stamping forming quality of the spoke has a decisive role on the structural strength and safety of the wheel. In the automotive field, the spoke of passenger vehicle needs to bear hundreds of newtons per square centimeter of pressure, and the spoke of commercial vehicle needs to bear several times the load of passenger vehicle. If wrinkles, edge cracks or flatness deviation occur during spoke stamping, it will cause stress concentration and greatly reduce the fatigue life of the wheel. In severe cases, it may cause major safety accidents such as spoke rupture and wheel out of control during driving.

[0003] According to the search, the patent document with publication number CN108889847B discloses a spoke stamping combined die, which comprises a lower die and an upper die arranged horizontally and coaxially with the center line. The upper die comprises an upper die frame, an upper die pressing block, a center punching upper punch and an upper die core with a spherical pit at the bottom. The upper die core and the center punching upper punch are fixedly connected to the lower surface of the upper die frame. The invention can complete the outer circle punching, stretching, center hole punching and flanging of the spoke stamping process in one step.

[0004] The above-mentioned prior art often has the following problems when in use:

[0005] The traditional combined die has many technical shortcomings. On the one hand, the closing speed of the punch and the die is fixed during stamping, which is difficult to adapt to the stamping characteristics of different thickness of raw materials. The deformation of thick plate material is large and the heat accumulation is obvious. Too fast speed will increase the friction heat between the die and the material, causing surface burn of the material or thermal wear of the die. The deformation resistance of thin plate material is small, so the stamping speed can be increased to improve the efficiency. On the other hand, a large amount of heat is generated by the friction between the die and the workpiece during stamping. If not cooled in time, the die temperature will rise, which will cause thermal deformation, reduce the precision of spoke stamping, and shorten the service life of the die. The traditional cooling method is continuous cooling, which cannot dynamically adjust the cooling intensity according to the temperature of the die, causing waste of cooling liquid. In addition, the traditional die lacks intelligent monitoring and adjusting mechanism, and the stamping parameters depend on manual experience setting. The speed switching for thick plate and thin plate needs to manually adjust the equipment parameters, which cannot adaptively adjust according to the thickness of the raw plate to be processed. The start and stop of the cooling system need to be judged manually, which cannot be automatically controlled according to the heat generation of different thickness of raw materials. SUMMARY

[0006] In view of the above-mentioned defects of the prior art, the present application provides a combined die for spoke intelligent stamping processing, which can effectively solve the problems of the prior art, such as the stamping speed being unable to adapt to the different characteristics of thick plates and thin plates, the cooling efficiency being low, and the lack of intelligence.

[0007] To achieve the above-mentioned purposes, the present application is implemented by the following technical solutions:

[0008] The present application provides a combined die for spoke intelligent stamping processing, which comprises a lower die seat, a female die fixedly connected to the upper surface of the lower die seat, an upper die seat arranged above the lower die seat, a plurality of first sleeves fixedly connected to the upper surface of the lower die seat, a first connecting rod slidingly connected to each of the first sleeves, the top end of each of the first connecting rods being fixedly connected to the bottom surface of the upper die seat, a male die fixedly connected to the bottom surface of the upper die seat, a plurality of first piston cylinders fixedly connected to the upper surface of the upper die seat, a first piston plate sealingly slidingly connected to each of the first piston cylinders, a support column fixedly connected to the upper surface of each of the first piston plates, and a stamping mounting seat fixedly connected to the top end of each of the support columns.

[0009] The intelligent stamping mechanism comprises a plurality of stamping speed self-adaptive components, a self-adaptive adjusting component, a die cooling component, a cooling opening and closing control component, and a cooling frequency adjusting component.

[0010] According to the above-mentioned combined die for spoke intelligent stamping processing, the self-adaptive adjusting component comprises a first recess provided in the bottom surface of the male die, an infrared distance measuring sensor fixedly arranged in the first recess, a PLC controller fixedly arranged on the side wall of the female die, a hydraulic cylinder fixedly connected to the upper surface of the upper die seat through a support, a guide cylinder fixedly connected to the upper surface of the upper die seat, a guide column slidingly connected to the guide cylinder, a plurality of third connecting rods fixedly connected to the side wall of the guide cylinder, a plurality of third sleeves slidingly sleeved on the plurality of third connecting rods, respectively, the output end of the hydraulic cylinder being fixedly connected to the top end of the guide column, and a plurality of support rods hinged to the side wall of the guide column, the bottom end of each of the plurality of support rods being hinged to the upper end surface of each of the plurality of third sleeves.

[0011] According to the spoke intelligent stamping processing combined die, the die cooling assembly comprises inlet pipes fixedly communicated with the side walls of the concave die and the convex die and outlet pipes, and two spiral cooling pipes are fixedly communicated between the two inlet pipes and the two outlet pipes, and the two spiral cooling pipes are fixedly arranged in the concave die and the convex die respectively.

[0012] According to the spoke intelligent stamping processing combined die, the cooling opening and closing control assembly comprises a No. 2 groove formed in the upper surface of the upper die seat, the inner wall of the No. 2 groove is fixedly connected with two guide rods, the two guide rods are slidably sleeved with a moving seat, two No. 2 springs are fixedly connected between the side walls of the moving seat and the inner walls of the No. 2 groove, the upper surface of the moving seat is fixedly connected with a bottom plate, the upper surface of the bottom plate is rotatably connected with a No. 1 rotating shaft through a bearing, the circumferential surface of the No. 1 rotating shaft is fixedly connected with a large circular table, the upper surface of the bottom plate is fixedly provided with a touch switch, and the bottom surface of the large circular table is fixedly connected with an arc-shaped pressing block.

[0013] According to the spoke intelligent stamping processing combined die, the cooling frequency modulation assembly comprises an installation plate fixedly connected with the side wall of the output end of the hydraulic cylinder, the upper surface of the installation plate is fixedly connected with a motor through a support, the output end of the motor is fixedly connected with a No. 2 rotating shaft, the No. 2 rotating shaft is rotatably connected to the bottom surface of the installation plate through a bearing, and the bottom end of the No. 2 rotating shaft is fixedly connected with a small circular table.

[0014] According to the spoke intelligent stamping processing combined die, the diameter of the bottom surface of the large circular table is greater than the diameter of the upper surface, the diameter of the bottom surface of the small circular table is less than the diameter of the upper surface, the side wall of the large circular table is in rolling contact with the side wall of the small circular table, the taper of the large circular table is the same as that of the small circular table, and the generatrix of the large circular table is collinearly attached to the generatrix of the small circular table.

[0015] According to the spoke intelligent stamping processing combined die, the two No. 2 springs are sleeved on the two guide rods respectively, the two side walls of the moving seat are attached to the two inner walls of the No. 2 groove respectively, the No. 1 spring in the stamping speed self-adapting assembly is sleeved on the No. 2 sleeve and the No. 2 connecting rod, the upper end surface of the one end of the plurality of No. 2 piston cylinders close to the guide cylinder is provided with a through groove, and the No. 1 piston plate and the No. 2 piston plate in the stamping speed self-adapting assembly are filled with hydraulic oil.

[0016] According to the spoke intelligent stamping processing combined die, the infrared distance measuring sensor and the hydraulic cylinder are electrically connected with the PLC controller, and the circuit formed among the infrared distance measuring sensor, the hydraulic cylinder and the PLC controller is electrically connected with the external power supply.

[0017] Compared with the known prior art, the technical scheme provided by the present application has the following beneficial effects:

[0018] 1. This invention, through its adaptive stamping speed component, can adaptively adjust speed and stability according to the different stamping characteristics of thick and thin plates. The hydraulic cylinder controls the position of the push plate to change the compression degree of the No. 1 spring. Different compression degrees correspond to different buffer idle stroke displacements. Combined with the damping effect of hydraulic oil, it can achieve low-speed stamping of thick plates and high-efficiency and stable-speed stamping of thin plates. This buffering effect can prevent the instantaneous impact force of stamping from acting directly on the mold cavity and blank, reducing the mold edge damage caused by excessive impact during thick plate stamping. At the same time, it can prevent uneven local stretching of thin plates caused by impact fluctuations, effectively avoiding defects such as thick plate burning, mold wear and thin plate breakage, and improving the stamping quality stability of spokes of different thicknesses.

[0019] 2. This invention, through its adaptive adjustment component, enables automatic detection of sheet metal thickness and convenient control of stamping parameters. The infrared ranging sensor detects the thickness of the sheet metal to be stamped in real time, and the data is directly fed back to the PLC controller, eliminating the need for manual input of thickness parameters and avoiding errors caused by manual setting. The PLC controller automatically adjusts the operating state of the hydraulic cylinder based on the thickness data, realizing an automated closed loop of "thickness monitoring - parameter calculation - execution adjustment", reducing the difficulty of operation and adapting to the flexible production needs of different specifications of wheel spokes.

[0020] 3. The mold cooling components of this invention can efficiently cool the mold. The spiral cooling pipe increases the contact area between the coolant and the die and punch, which helps to improve the heat exchange efficiency, quickly remove the heat generated by stamping, avoid mold thermal deformation, extend the service life of the mold, and at the same time ensure the stamping accuracy of the wheel spokes.

[0021] 4. The present invention can realize the automatic start and stop of the cooling system by setting the cooling start and stop control component. By using the periodic pressing of the large truncated cone and the arc-shaped pressing block, the touch switch controls the intermittent operation of the cooling component, avoiding the waste of coolant caused by traditional continuous cooling and reducing processing costs.

[0022] 5. The present invention, through the cooling frequency adjustment component, can flexibly adjust the cooling intensity and frequency. The motor drives the small circular platform to rotate, and drives the large circular platform to rotate through the conical transmission. With the help of the adaptive adjustment component, the rotation speed of the large circular platform can be adjusted by controlling the position of the small circular platform, thereby adjusting the pressing frequency of the arc-shaped pressing block, so as to control the output frequency of the coolant. The cooling intensity can be dynamically adjusted according to the mold temperature to adapt to the heat dissipation requirements under different stamping loads. Attached Figure Description

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0024] Figure 1 It is a schematic view of the three-dimensional structure of the present application;

[0025] Figure 2 It is a schematic view of the three-dimensional structure analysis of the present application;

[0026] Figure 3 It is a schematic view of the three-dimensional structure of another perspective of the present application;

[0027] Figure 4 It is a schematic view of the three-dimensional structure of another perspective of the present application;

[0028] Figure 5 It is Figure 2 the enlarged view at A in FIG. 1;

[0029] Figure 6 It is Figure 3 the enlarged view at B in FIG. 1;

[0030] Figure 7 It is Figure 4 the enlarged view at C in FIG. 1.

[0031] The drawings are as follows: 1, lower die seat; 11, concave die; 12, upper die seat; 13, No. 1 sleeve; 14, No. 1 connecting rod; 15, convex die; 16, No. 1 piston cylinder; 17, No. 1 piston plate; 18, support column; 19, stamping mounting seat; 2, stamping speed self-adaptive assembly; 21, No. 2 piston cylinder; 22, annular baffle; 23, No. 2 piston plate; 24, No. 2 sleeve; 25, No. 2 connecting rod; 26, push plate; 27, No. 1 spring; 28, No. 3 sleeve; 3, self-adaptive adjusting assembly; 31, No. 1 groove; 32, infrared distance measuring sensor; 33, PLC controller; 34, hydraulic cylinder; 35, guide cylinder; 36, guide column; 37, No. 3 connecting rod; 38, support rod; 39, through groove; 4, mold cooling assembly; 41, liquid inlet pipe; 42, liquid outlet pipe; 5, cooling opening and closing control assembly; 51, No. 2 groove; 52, guide rod; 53, moving seat; 54, No. 2 spring; 55, bottom plate; 56, No. 1 rotating shaft; 57, large circular table; 58, touch pressure switch; 59, arc-shaped pressing block; 6, cooling frequency modulation assembly; 61, mounting plate; 62, motor; 63, No. 2 rotating shaft; 64, small circular table. DETAILED DESCRIPTION

[0032] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0033] The present application will be further described below with reference to the embodiments.

[0034] Embodiment: Refer to Figures 1 to 7 A spoke intelligent stamping processing combined die, comprising a lower die seat 1, the upper surface of the lower die seat 1 is fixedly connected with a female die 11, the upper side of the lower die seat 1 is provided with an upper die seat 12, the upper surface of the lower die seat 1 is fixedly connected with a plurality of first sleeves 13, a first connecting rod 14 is slidingly connected in each of the plurality of first sleeves 13, the top end of each of the plurality of first connecting rods 14 is fixedly connected with the bottom surface of the upper die seat 12, the bottom surface of the upper die seat 12 is fixedly connected with a male die 15, the upper surface of the upper die seat 12 is fixedly connected with a plurality of first piston cylinders 16, a first piston plate 17 is sealingly slidingly connected in each of the plurality of first piston cylinders 16, the upper surface of each of the plurality of first piston plates 17 is fixedly connected with a support column 18, the top end of each of the plurality of support columns 18 is fixedly connected with a stamping mounting seat 19;

[0035] The intelligent stamping mechanism comprises a plurality of stamping speed adaptive components 2, adaptive adjusting components 3, die cooling components 4, cooling opening and closing control components 5 and cooling frequency adjusting components 6, the stamping speed adaptive component 2 comprises a second piston cylinder 21 fixedly connected to the side wall of the first piston cylinder 16, the inner wall of the second piston cylinder 21 is fixedly connected with an annular baffle 22, a second piston plate 23 is sealingly slidingly connected in the second piston cylinder 21, the side wall of the second piston plate 23 is fixedly connected with a second sleeve 24, a second connecting rod 25 is slidingly connected in the second sleeve 24, a push plate 26 is slidingly connected in the second piston cylinder 21, the side end of the second connecting rod 25 is fixedly connected with the side wall of the push plate 26, a first spring 27 is fixedly connected between the push plate 26 and the second piston plate 23, a third sleeve 28 is fixedly connected to the side wall of the side of the push plate 26 away from the second connecting rod 25, the first spring 27 in the stamping speed adaptive component 2 is sleeved on the second sleeve 24 and the second connecting rod 25, hydraulic oil is filled between the first piston plate 17 and the second piston plate 23 in the stamping speed adaptive component 2;

[0036] The adaptive adjusting assembly 3 comprises a first recess 31 formed in the bottom surface of the male die 15, and an infrared distance sensor 32 fixedly arranged in the first recess 31; a PLC controller 33 fixedly arranged on the side wall of the female die 11; a hydraulic cylinder 34 fixedly connected to the upper surface of the upper die seat 12 through a support; a guide cylinder 35 fixedly connected to the upper surface of the upper die seat 12; a guide column 36 slidably connected to the guide cylinder 35; a plurality of third connecting rods 37 fixedly connected to the side wall of the guide cylinder 35; a plurality of third sleeves 28 respectively slidably sleeved on the plurality of third connecting rods 37; the output end of the hydraulic cylinder 34 is fixedly connected to the top end of the guide column 36; a plurality of supporting rods 38 are hingedly connected to the side wall of the guide column 36; the bottom ends of the plurality of supporting rods 38 are respectively hingedly connected to the upper end surfaces of the plurality of third sleeves 28; the upper end surfaces of the plurality of second piston cylinders 21 close to one end of the guide cylinder 35 are each provided with a through groove 39, so that the plurality of supporting rods 38 can move without being blocked; the infrared distance sensor 32 and the hydraulic cylinder 34 are electrically connected to the PLC controller 33; and the circuit formed among the infrared distance sensor 32, the hydraulic cylinder 34 and the PLC controller 33 is electrically connected to an external power supply.

[0037] Specifically, the probe surface of the infrared distance sensor 32 is covered with a transparent wear-resistant sapphire lens (thickness 1 mm, light transmittance ≥95%), to prevent metal debris from directly contacting the probe; meanwhile, after each stamping cycle is completed, the PLC controller starts external compressed air blowing (compressed air pressure 0.3-0.5 MPa, blowing time 1 second) after a delay of 2 seconds, the compressed air blows off the residual debris on the lens surface through a preset micro air duct (diameter 1.5 mm, one end communicated with the first recess 31 and the other end externally connected to an air source) in the male die 15, to avoid pollution of the detection environment.

[0038] The mold cooling assembly 4 comprises inlet pipes 41 and outlet pipes 42 fixedly communicated with the side walls of the female die 11 and the male die 15, and a plurality of spiral cooling pipes fixedly communicated between the two inlet pipes 41 and the two outlet pipes 42, the two spiral cooling pipes are respectively fixedly arranged in the female die 11 and the male die 15, and the shapes of the two spiral cooling pipes are similar to Archimedes spiral antennas (the two spiral cooling pipes are not shown in the figure, and the inlet pipes 41 and the outlet pipes 42 are respectively located on the two sides of the spiral cooling pipes), so that the heat exchange efficiency is improved through the spiral structure.

[0039] Specifically, an inclined slope of 1°-2° is arranged along the liquid flow direction of the entire cooling pipeline, to utilize gravity to assist the backflow of the cooling liquid and avoid liquid accumulation in the “dead zone” of the pipeline; meanwhile, the bending radius of the spiral cooling pipe is ≥10 times the pipe diameter (for example, when the pipe diameter is 8 mm, the bending radius is ≥80 mm), to reduce the liquid flow resistance and ensure smooth backflow.

[0040] The cooling liquid is selected as a water-based anti-rust cooling liquid (anti-rust grade ≥ GB / T16630-2017 A level), and an external standard filter (filtering precision 5 μm, such as model SF-05) is connected in series at the front end of the liquid inlet pipe 41. Through selection and external filtration, impurities are prevented from blocking the pipeline. At the same time, when the touch switch 58 of the cooling start-stop control assembly 5 is closed each time, the external cooling liquid circulating pump (flow rate 8-12 L / min) is started synchronously, and the pump is delayed for 3 seconds to be closed when the touch switch is turned off. The forced power of the circulating pump ensures that the cooling liquid is emptied, avoiding the evaporation of residual water to form scale.

[0041] The cooling start-stop control assembly 5 includes a No. 2 recess 51 opened on the upper surface of the upper die seat 12, the inner wall of the No. 2 recess 51 is fixedly connected with two guide rods 52, the two guide rods 52 are slidably sleeved with a moving seat 53, two No. 2 springs 54 are fixedly connected between the side wall of the moving seat 53 and the inner wall of the No. 2 recess 51, a bottom plate 55 is fixedly connected to the upper surface of the moving seat 53, a No. 1 rotating shaft 56 is rotatably connected to the upper surface of the bottom plate 55 through a bearing, a large circular table 57 is fixedly connected to the No. 1 rotating shaft 56, a touch switch 58 is fixedly installed on the upper surface of the bottom plate 55, and an arc pressing block 59 is fixedly connected to the bottom surface of the large circular table 57. The two No. 2 springs 54 are sleeved on the two guide rods 52 respectively, and the two side walls of the moving seat 53 are fitted with the two side walls of the No. 2 recess 51 respectively.

[0042] The cooling frequency modulation assembly 6 includes a mounting plate 61 fixedly connected to the side wall of the output end of the hydraulic cylinder 34, an electric motor 62 fixedly connected to the upper surface of the mounting plate 61 through a support, a No. 2 rotating shaft 63 fixedly connected to the output end of the electric motor 62, the No. 2 rotating shaft 63 rotatably connected to the bottom surface of the mounting plate 61 through a bearing, a small circular table 64 fixedly connected to the bottom end of the No. 2 rotating shaft 63, the diameter of the bottom surface of the large circular table 57 is larger than the diameter of the upper surface, the diameter of the bottom surface of the small circular table 64 is smaller than the diameter of the upper surface, the side wall of the large circular table 57 is in rolling contact with the side wall of the small circular table 64, the taper of the large circular table 57 is the same as that of the small circular table 64, and the generatrix of the large circular table 57 is collinearly fitted with the generatrix of the small circular table 64.

[0043] Specifically, the No. 2 spring 54 is selected as a cylindrical helical compression spring, the elastic coefficient k = 800-1000 N / m, the free length is 20 mm, and the pre-compression amount is 5 mm during installation. By pre-setting sufficient axial pre-tightening force, the moving seat 53 always maintains pressure in the direction of the small circular table 64, ensuring that the taper surfaces of the large circular table 57 and the small circular table 64 are closely fitted (contact pressure ≥ 50 N), avoiding disengagement due to vibration or radial force.

[0044] Specifically, the conical surface roughness of the large circular table 57 and the small circular table 64 is Ra0.8 μm, and both are subjected to chrome plating treatment (plating layer thickness 5-8 μm), so as to reduce the friction coefficient of the conical surface transmission (friction coefficient ≤0.1), reduce the influence of the radial component on the fitting state, and ensure the smooth transmission process without jamming.

[0045] The working principle of the application is as follows: when the combined die for intelligent stamping of the spoke is used, the output end of the stamping machine needs to be connected with the stamping mounting seat 19, and an external cooling liquid output device also needs to be provided, the output end of the cooling liquid output device is connected with the two liquid inlet pipes 41, and the cooling liquid output device is electrically connected with the touch switch 58, and the opening and closing of the cooling liquid output device is controlled through the touch switch 58;

[0046] After the above is completed, the blank spoke to be processed is placed on the concave die 11 of the lower die seat 1, the external power supply and the motor 62 are started, the PLC controller 33 enters the working state, the infrared distance measuring sensor 32 detects and judges the thickness of the processing blank, and transmits the signal to the PLC controller 33, according to the thickness characteristics of the blank plate to be stamped, the PLC controller 33 controls the output end of the hydraulic cylinder 34 to be extended or retracted, drives the guide column 36 to move along the guide cylinder 35, the guide column 36 drives the third sleeve 28 to slide along the third connecting rod 37 through the supporting rod 38, and then drives the push plate 26 to move in the second piston cylinder 21, the push plate 26 is compressed when moving, the compression degree of the first spring 27 is adjusted to preset the stamping buffer idle stroke displacement (the thickness of the blank to be stamped is about thick, the smaller the distance of the output end of the hydraulic cylinder 34 moving down, the smaller the moving distance of the push plate 26, at this time the compression degree of the spring is small, corresponding to a larger spring compression amount, which increases the buffer idle stroke during stamping, thereby reducing the stamping speed, similarly, when the thickness of the blank to be stamped is about thin, the greater the distance of the output end of the hydraulic cylinder 34 moving down, the greater the moving distance of the push plate 26, at this time the compression degree of the spring is large, corresponding to a smaller spring compression amount, so as to reduce the buffer idle stroke and improve the stamping speed), after the compression degree of the spring is adjusted, the external stamping machine is started, the output end thereof applies downward stamping power through the stamping mounting seat 19, the supporting column 18 drives the first piston plate 17 to move downward, the hydraulic oil is pressed into the second piston cylinder 21, the upper die seat 12 moves downward, and the stamping of the spoke is started.

[0047] During the stamping process, the compression buffer of the first spring 27 and the damping effect of the hydraulic oil jointly control the stamping speed. When the preset is thick plate stamping (larger spring compression amount), the upper die holder 12 has a large idle stroke displacement at the initial stage of stamping, the stamping speed is reduced, the friction heat accumulation between the die and the thick plate is reduced, and the surface of the material is prevented from being burned or the die from being hot worn. When the preset is thin plate stamping (smaller spring compression amount), the force transmitted by the first spring 27 is more concentrated, the idle stroke displacement of the upper die holder 12 is smaller, the stamping speed is increased, and the hydraulic oil and the spring jointly inhibit the speed fluctuation to prevent the thin plate from being stretched and broken or having surface defects due to vibration. When the punch 15 reaches the set pressure maintaining position, the infrared distance sensor 32 feeds back the distance signal to the PLC controller 33, and the external stamping machine stops pressing, maintains the pressure setting time, and ensures the size accuracy of the spoke;

[0048] At the same time, the cooling system adaptively adjusts the cooling frequency according to the thickness of the plate, the PLC controller 33 controls the hydraulic cylinder 34 output end to move to the corresponding position according to the plate thickness data monitored by the infrared distance sensor 32, when stamping thick plates (high frequency cooling is needed due to fast heating), the hydraulic cylinder 34 output end drives the mounting plate 61 and the small circular table 64 to move a small distance downward, so that the contact position of the small circular table 64 and the large circular table 57 is biased to the upper part of the large circular table 57 (small diameter), when stamping thin plates (low frequency cooling is needed due to slow heating), the hydraulic cylinder 34 output end drives the small circular table 64 to move a large distance downward, so that the contact position is biased to the lower part of the large circular table 57 (large diameter). Because the large circular table 57 is small at the top and large at the bottom, and the small circular table 64 is large at the top and small at the bottom, and the taper is the same, when the small circular table 64 rotates at different contact positions, the large circular table 57 rotates at different speeds through the taper transmission. When contacting the lower part (large diameter end) of the large circular table 57, the large circular table 57 rotates at a slower speed, and when contacting the upper part (small diameter end), the large circular table 57 rotates at a faster speed. The motor 62 keeps a constant speed to drive the small circular table 64 to rotate, and the large circular table 57 obtains different speeds after changing the contact position. The frequency of the arc-shaped pressing block 59 on the bottom surface of the large circular table 57 periodically pressing the touch switch 58 also changes accordingly. Thick plates correspond to high-frequency pressing (high cooling frequency), and thin plates correspond to low-frequency pressing (low cooling frequency), which realizes precise adaptation of cooling strength and plate thickness. The touch switch 58 controls the opening and closing of the cooling liquid output device. When pressing, the cooling liquid output device is started, and the cooling liquid is cooled through the spiral cooling pipe for the concave die 11 and the punch 15. After heat exchange, it is discharged from the liquid outlet pipe 42. When released, the cooling liquid output device is closed, realizing intermittent cooling with adjustable frequency. At the same time, the guide rod 52 and the second spring 54 in the cooling on-off control assembly 5 cooperate with the moving seat 53 to ensure that the large circular table 57 and the small circular table 64 are always closely matched in transmission, avoid transmission failure caused by displacement, and ensure the stability of the cooling frequency adjustment;

[0049] After the stamping is completed, the external stamping machine output end is lifted, driving the stamping mounting seat 19 and the supporting column 18 to rise, the first piston plate 17 resets, the hydraulic oil flows back to the first piston cylinder 16, the first spring 27 returns to the state after the adjustment is completed, the upper die seat 12 and the male die 15 rise and reset, the formed spoke is taken out, and one stamping cycle is completed.

[0050] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced equivalently; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the embodiments of the present application.

Claims

1. A combined mold for intelligent stamping of wheel spokes, characterized in that, include: A lower die base (1) is fixedly connected to a die cavity (11) on its upper surface. An upper die base (12) is provided above the lower die base (1). Multiple first sleeves (13) are fixedly connected to the upper surface of the lower die base (1). A first connecting rod (14) is slidably connected inside each of the multiple first sleeves (13). The top ends of the multiple first connecting rods (14) are fixedly connected to the bottom surface of the upper die base (12). A punch (15) is fixedly connected to the bottom surface of the upper die base (12). Multiple first piston cylinders (16) are fixedly connected to the upper surface of the upper die base (12). A first piston plate (17) is slidably connected inside each of the multiple first piston cylinders (16). A support column (18) is fixedly connected to the upper surface of each of the multiple first piston plates (17). A stamping mounting seat (19) is fixedly connected to the top end of each of the multiple support columns (18). The intelligent stamping mechanism includes multiple stamping speed adaptive components (2), adaptive adjustment components (3), mold cooling components (4), cooling opening and closing control components (5), and cooling frequency modulation components (6). The stamping speed adaptive component (2) includes a second piston cylinder (21) fixedly connected to the side wall of the first piston cylinder (16). An annular baffle (22) is fixedly connected to the inner wall of the second piston cylinder (21), and a second piston plate (23) is slidably and sealingly connected inside the second piston cylinder (21). A second sleeve (24) is fixedly connected to the side wall of the second piston plate (23). A second connecting rod (25) is slidably connected inside the second sleeve (24). A push plate (26) is slidably connected inside the second piston cylinder (21). The side end of the second connecting rod (25) is fixedly connected to the side wall of the push plate (26). A first spring (27) is fixedly connected between the push plate (26) and the second piston plate (23). A third sleeve (28) is fixedly connected to the side wall of the push plate (26) away from the second connecting rod (25). The adaptive adjustment component (3) includes a first groove (31) opened on the bottom surface of the punch (15), an infrared ranging sensor (32) is fixedly installed in the first groove (31), a PLC controller (33) is fixedly installed on the side wall of the die (11), a hydraulic cylinder (34) is fixedly connected to the upper surface of the upper die base (12) through a bracket, a guide cylinder (35) is fixedly connected to the upper surface of the upper die base (12), a guide column (36) is slidably connected in the guide cylinder (35), a plurality of third connecting rods (37) are fixedly connected to the side wall of the guide cylinder (35), a plurality of third sleeves (28) are slidably sleeved on the plurality of third connecting rods (37), the output end of the hydraulic cylinder (34) is fixedly connected to the top end of the guide column (36), a plurality of support rods (38) are hinged to the side wall of the guide column (36), and the bottom ends of the plurality of support rods (38) are hinged to the upper end faces of the plurality of third sleeves (28). The mold cooling assembly (4) includes an inlet pipe (41) and an outlet pipe (42) fixedly connected to the side walls of the die (11) and the punch (15). A spiral cooling pipe is fixedly connected between the two inlet pipes (41) and the outlet pipe (42). The two spiral cooling pipes are respectively fixedly installed in the die (11) and the punch (15). The cooling opening and closing control assembly (5) includes a second groove (51) opened on the upper surface of the upper mold base (12). Two guide rods (52) are fixedly connected to the inner wall of the second groove (51). A movable seat (53) is slidably sleeved on the two guide rods (52). Two second springs (54) are fixedly connected between the side wall of the movable seat (53) and the inner wall of the second groove (51). A base plate (55) is fixedly connected to the upper surface of the movable seat (53). A first rotating shaft (56) is rotatably connected to the upper surface of the base plate (55) through a bearing. A large truncated cone (57) is fixedly connected to the circumference of the first rotating shaft (56). A touch switch (58) is fixedly installed on the upper surface of the base plate (55). An arc-shaped pressing block (59) is fixedly connected to the bottom surface of the large truncated cone (57).

2. The combined mold for intelligent stamping of wheel spokes according to claim 1, characterized in that, The cooling frequency modulation assembly (6) includes a mounting plate (61) fixedly connected to the side wall of the output end of the hydraulic cylinder (34). A motor (62) is fixedly connected to the upper surface of the mounting plate (61) by a bracket. A second rotating shaft (63) is fixedly connected to the output end of the motor (62). The second rotating shaft (63) is rotatably connected to the bottom surface of the mounting plate (61) through a bearing. A small frustum (64) is fixedly connected to the bottom end of the second rotating shaft (63).

3. The combined mold for intelligent stamping of wheel spokes according to claim 2, characterized in that, The diameter of the bottom surface of the large truncated cone (57) is greater than the diameter of the top surface, and the diameter of the bottom surface of the small truncated cone (64) is smaller than the diameter of the top surface. The side wall of the large truncated cone (57) and the side wall of the small truncated cone (64) are in rolling contact. The large truncated cone (57) and the small truncated cone (64) have the same taper, and the generatrices of the large truncated cone (57) and the small truncated cone (64) are collinear and in close contact.

4. The combined mold for intelligent stamping of wheel spokes according to claim 1, characterized in that, Two second springs (54) are respectively sleeved on two guide rods (52). The two side walls of the moving seat (53) are respectively attached to the two inner walls of the second groove (51). The first spring (27) in the stamping speed adaptive assembly (2) is sleeved on the second sleeve (24) and the second connecting rod (25). The upper end face of the multiple second piston cylinders (21) near the guide cylinder (35) is provided with through grooves (39). Hydraulic oil is filled between the first piston plate (17) and the second piston plate (23) in the stamping speed adaptive assembly (2).

5. The combined mold for intelligent stamping of wheel spokes according to claim 1, characterized in that, The infrared ranging sensor (32) and the hydraulic cylinder (34) are both electrically connected to the PLC controller (33), and the circuit formed between the infrared ranging sensor (32), the hydraulic cylinder (34) and the PLC controller (33) is electrically connected to an external power supply.

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