An earphone elastic sheet cutting device

Abstract

This application relates to the technical field of earphone shrapnel, and in particular to an earphone shrapnel cutting device, which includes an unwinding unit and a winding unit. A cutting table is installed between the unwinding unit and the winding unit, and a first cutting unit and a second cutting unit are sequentially arranged on the cutting table. During the working process, the steel strip unwound by the unwinding unit is input into the first cutting unit to punch out flat blanks on the steel strip, and at the same time, a connection point is reserved between the flat blanks and the steel strip and remains in the steel strip. Then, the second cutting unit cuts off the connection point, so that the flat blanks are separated from the steel strip to obtain finished flat blanks. After that, the steel strip waste from which the flat blanks have been separated is then transported to the winding unit for winding. This application cuts in two steps to obtain the flat blanks of the required steel strip shrapnel, and the flat blanks are cut out in the steel strip only in the second step, which can ensure that the first cutting unit can work continuously in the first step, and its overall working efficiency is relatively high.

Description

Technical Field

[0001] This application relates to the technical field of earphone shrapnel, and in particular to an earphone shrapnel cutting device. Background Art

[0002] Among various earphones, the characteristics of over-ear earphones are relatively obvious. Since they can surround the ears and provide good sound insulation, they are suitable for long-term wearing and are often used for high-quality audio experiences, such as music, movies, games, etc.

[0003] Among them, the steel strip shrapnel is the main support structure of the headband in over-ear earphones. It can usually provide sufficient elasticity, so that the headband of the earphone can be automatically adjusted according to the wearer's head shape, thus providing a comfortable wearing experience.

[0004] Refer to Figure 1 and Figure 2 , where Figure 1 is the flat blank to be processed in this application, and Figure 2 is the finished steel strip shrapnel formed after bending and shaping the flat blank. Among them, the flat blank includes a steel sheet main body 101, a strip-shaped groove 102 formed in the middle of the steel sheet main body 101, and assembly holes 103 formed on both sides of the strip-shaped groove 102.

[0005] Currently, during the processing of it, usually a punching machine is used to continuously punch out the steel sheet main body one by one on the steel strip, and then through other punching machines, the corresponding strip-shaped grooves and assembly holes are respectively punched out to obtain the flat blank. Finally, a rolling bender is used to perform shaping processing on it, so that it gradually deforms to form the required arc-shaped steel strip shrapnel.

[0006] However, during the process of obtaining the flat blank, the involved process steps are relatively complex and cumbersome, and the processing efficiency is relatively low. It not only requires more manpower and material resources, but also takes a long processing cycle. Therefore, further improvement can be made. Summary of the Invention

[0007] In order to improve the processing efficiency of the flat blank, this application provides an earphone shrapnel cutting device.

[0008] An earphone shrapnel cutting device provided by this application adopts the following technical solutions:

[0009] An earphone spring piece cutting device includes an unwinding unit and a winding unit for unwinding and winding a steel strip. A cutting table is installed between the unwinding unit and the winding unit. A first cutting unit and a second cutting unit are sequentially arranged on the cutting table. The first cutting unit is used to punch a flat blank on the steel strip, and a connection point is reserved between the flat blank and the steel strip. The second cutting unit is used to cut off the reserved connection point between the flat blank and the steel strip.

[0010] By adopting the above technical solution, during the working process, the steel strip unwound by the unwinding unit is sequentially input into the first cutting unit and the second cutting unit on the cutting table for cutting treatment. Among them, the first cutting unit punches a flat blank on the steel strip. Since a connection point is reserved between the flat blank and the steel strip after punching, the flat blank can stay inside the steel strip through this connection point after die opening. Then, the second cutting unit cuts off the reserved connection point between the flat blank and the steel strip, so that the flat blank is separated from the steel strip to obtain a finished flat blank. After that, the steel strip waste separated from the flat blank is then transported to the winding unit for winding. Therefore, the present application can directly obtain the flat blank of the required steel strip spring piece on the steel strip by using the first cutting unit and the second cutting unit. In addition, the second cutting unit is used to cut and separate the flat blank in the steel strip only in the second step, which can ensure that the first cutting unit can work continuously in the first step, and its overall working efficiency is relatively high. Otherwise, if direct cutting is performed in the first step, after each cutting, the first cutting unit needs to be stopped, and then the flat blank needs to be taken out before the next cycle of cutting can be carried out, and its efficiency is very slow.

[0011] Optionally, the first cutting unit includes an upper die base, a lower die base and a die opening power component. The lower die base is fixed on the cutting table, and the die opening power component is used to control the upper die base and the lower die base to close or open the die. The upper die base is respectively provided with a first cutter head, a second cutter head and a third cutter head. The first cutter head, the second cutter head and the third cutter head are respectively adapted to the strip groove, the assembly hole and the outer contour of the steel sheet body in the flat blank, and a break is preset in the third cutter head. A tool post adapted to the inner contour of the third cutter head is formed on the top of the lower die base. A first tool groove and a second tool groove respectively adapted to the first cutter head and the second cutter head are formed in the tool post, and both the first tool groove and the second tool groove are through-shaped.

[0012] By adopting the above technical solution, during the operation of the first cutting process, after the upper die base and the lower die base are closed, the third cutter head is aligned with the tool table to cut out the outer contour in the flat blank on the steel strip. At the same time, the first cutter head and the second cutter head are respectively aligned with the first cutter groove and the second cutter groove to punch out the strip groove and the assembly hole in the flat blank. In addition, since a notch is preset in the third cutter head, a connection point is formed between the two at this position, so that after the flat blank is cut and the die is opened, it can remain inside the steel strip through this connection point. Therefore, in this process, there is no need to consider the problem of taking out the flat blank. Therefore, the first cutting unit can perform continuous blanking work with high blanking efficiency.

[0013] Optionally, the notch preset in the third cutter head is located at the middle position.

[0014] By adopting the above technical solution, on the one hand, since the middle of the third cutter head is a straight line segment and both ends are arc segments, if the preset notch position in the third cutter head is arranged at both ends, it is not convenient for the subsequent second cutting unit to cut off the reserved connection point formed by it. On the other hand, during the earphone assembly process, the ear cups need to be installed at both ends of the steel strip elastic piece so that it can automatically adjust according to the wearer's head shape during use. If the preset notch position in the third cutter head is arranged at both ends, it means that after the second cutting unit cuts it off, additional fine grinding is required to ensure the smooth adjustment during its assembly and use. And this also means that more grinding work needs to be invested, which is more time-consuming and laborious. On the contrary, arranging the preset notch position in the third cutter head at the middle position will not affect the subsequent adjustment of the ear cups (because the ear cups on both sides only need to be adjusted along the two ends of the steel strip elastic piece). That is, after the second cutting unit cuts it off, there is no need to perform additional fine grinding on it, which can reduce the investment in unnecessary processes.

[0015] Optionally, the heights of the third cutter head, the second cutter head, and the first cutter head increase in sequence. Let the height difference between the first cutter head and the second cutter head be ∆x1, the height difference between the second cutter head and the third cutter head be ∆x2, and the thickness of the steel strip to be blanked be d. Then both ∆x1 and ∆x2 are greater than d.

[0016] By adopting the above technical solution, since the heights of the third cutter head, the second cutter head, and the first cutter head increase in sequence, this means that during the punching process, the first cutter head first contacts the steel strip to punch holes, then the second cutter head, and finally the third cutter head. Secondly, since the height difference ∆x1 between the first cutter head and the second cutter head and the height difference ∆x2 between the second cutter head and the third cutter head are both greater than the thickness d of the steel strip, that is, after the first cutter head punches through the steel strip, the second cutter head starts to perform blanking, and then after the second cutter head punches through the steel strip, the third cutter head starts to perform blanking.

[0017] Therefore, during the whole process, the three cutting heads perform blanking successively, and there is no situation where multiple cutting heads simultaneously perform punching on the steel strip. This independent punching method can reduce the mutual influence of different cutting heads during the punching process to ensure the punching quality. Otherwise, if the three cutting heads punch simultaneously, it means that the steel strip needs to deform and split at three positions simultaneously, which is likely to cause deformation of the punched product.

[0018] In addition, the first cutting head, the second cutting head, and the third cutting head perform punching successively in sequence, which is also considered in terms of the type of cutting head. Among them, the punching surface of the first cutting head is relatively large. After punching, the position can be positioned and stabilized, and during the punching processes of the subsequent second cutting head and third cutting head, it is not easy to be affected by it. On the contrary, if the first cutting head is placed behind the second cutting head (that is, the second cutting head punches first and then the first cutting head), since the second cutting head is relatively small, the deformation of the steel strip caused by the first cutting head during the punching process is likely to affect the second cutting head, and the second cutting head will be worn or even damaged.

[0019] Optionally, d + 1mm < ∆x1 < d + 3mm, and d + 1mm < ∆x2 < d + 3mm.

[0020] By adopting the above technical solution, setting the values of ∆x1 and ∆x2 between d + 1mm and d + 3mm has better effects.

[0021] Optionally, a pressure plate is further installed at the bottom of the upper die base. The pressure plate is arranged on both the left and right sides of the third cutting head and can perform elastic lifting; on both sides of the tool table of the lower die base, support bosses are provided. The support bosses are arranged opposite to the pressure plate, and the top surface of the support bosses is flush with the top surface of the tool table.

[0022] By adopting the above technical solution, by further installing a pressure plate at the bottom of the upper die base, during the die closing process, the pressure plate can be used to elastically press the peripheral position of the steel strip at the blanking position to perform preliminary pressing on it, so as to improve the forming effect after blanking.

[0023] Optionally, T-shaped hanging grooves are formed at both the left and right sides of the third cutting head inside the upper die base, and the upper and lower ends of the T-shaped hanging grooves respectively penetrate through the upper and lower end faces of the upper die base; a T-shaped hanging rod is slidably installed in the T-shaped hanging groove. The bottom of the T-shaped hanging rod extends out of the T-shaped hanging groove and is fixedly connected to the top of the pressure plate; a part of the bottom of the T-shaped hanging rod extending out of the T-shaped hanging groove is sleeved with a return spring, and the bottom of the return spring presses against the top of the pressure plate.

[0024] By adopting the above technical solution, during the mold closing process, as the upper mold base moves downward, the pressure plate first presses tightly on both sides of the steel strip at the blanking position. At the same time, as the upper mold base continues to move downward, the return spring in the T-shaped hanging groove is compressed, so as to continuously increase the pressing force of the pressure plate on the steel strip, so as to realize the pre-elastic pressing of the peripheral position of the steel strip at the blanking position before blanking. Similarly, after the mold is opened, under the action of the return spring, the pressure plate is reset.

[0025] Optionally, the second cutting unit is a laser cutting device.

[0026] By adopting the above technical solution, since the cutting objects of the second cutting unit and the first cutting unit are both on the same steel strip, its cutting efficiency depends on the slowest step of the two. Only after both complete the cutting action can the steel be dragged to move and the next cutting cycle be carried out. Therefore, if the cutting of the second cutting unit is too slow, it will affect the cutting efficiency of the first cutting unit.

[0027] And in the cutting of the second part, the part to be cut is only the reserved connection point between the cut flat blank and the steel strip, and the cutting part is relatively small. Therefore, using the laser method for cutting can also ensure that the cutting process is completed in a short time without affecting the cutting efficiency of the first cutting unit. At the same time, it can also take into account the advantages of laser cutting to obtain flat blanks with better forming effects.

[0028] Optionally, roller assemblies are installed on both the input and output sides of the cutting table. The roller assemblies include two rows of rollers, which are respectively used to control the horizontal feeding input and horizontal feeding output of the steel strip.

[0029] By adopting the above technical solution, by installing roller assemblies on both the input and output sides of the cutting table to control the horizontal feeding input and horizontal feeding output of the steel strip, the horizontal feeding of the steel strip between the first cutting unit and the second cutting unit is ensured, so as to ensure the subsequent cutting and forming effect.

[0030] In summary, the present application includes at least one of the following beneficial technical effects:

[0031] 1. The present application can use the first cutting unit and the second cutting unit to directly obtain the flat blanks of the required steel strip elastic pieces on the steel strip. In addition, in the second step, the second cutting unit is used to cut and separate the flat blanks in the steel strip, which can ensure that the first cutting unit can work continuously in the first step, and its overall working efficiency is relatively high. Otherwise, if direct cutting is carried out in the first step, after each cutting, the first cutting unit needs to be stopped, and then the flat blank is taken out before the next cutting cycle can be carried out, and its efficiency is very slow;

[0032] 2. During the operation of the first cutting process, after the upper die base and the lower die base are closed, the third cutter head is aligned with the tool table to cut out the outer contour in the flat blank on the steel strip. At the same time, the first cutter head and the second cutter head are respectively aligned with the first cutter groove and the second cutter groove to punch out the strip groove and the assembly hole in the flat blank. In addition, since a notch is preset in the third cutter head, a connection point is formed between the two at this position, so that after the flat blank is cut and the die is opened, it can remain inside the steel strip through this connection point. Therefore, in this process, there is no need to consider the problem of taking out the flat blank. Therefore, the first cutting unit can perform continuous blanking operations with high blanking efficiency;

[0033] 3. Since the heights of the third cutter head, the second cutter head, and the first cutter head increase in sequence, this means that during the punching process, the first cutter head contacts the steel strip first to punch holes, followed by the second cutter head, and finally the third cutter head. Secondly, since the height difference ∆x1 between the first cutter head and the second cutter head and the height difference ∆x2 between the second cutter head and the third cutter head are both greater than the thickness d of the steel strip, that is, after the first cutter head punches through the steel strip, the second cutter head starts to perform blanking, and then after the second cutter head punches through the steel strip, the third cutter head starts to punch. Therefore, during the whole process, the three cutter heads perform blanking successively, and there is no situation where multiple cutter heads simultaneously cut the steel strip. This independent cutting method can reduce the mutual influence of different cutter heads during the cutting process to ensure the cutting quality. Otherwise, if the three cutter heads cut simultaneously, it means that the steel strip needs to deform and split at three positions simultaneously, which is likely to cause deformation of the cut product. Description of the Drawings

[0034] Figure 1 is the flat blank to be processed in this application.

[0035] Figure 2 is the finished steel strip elastic sheet formed after bending and shaping the flat blank.

[0036] Figure 3 is the overall structural schematic diagram of a headphone elastic sheet cutting device in this application.

[0037] Figure 4 is the structural schematic diagram of the first cutting unit in this application.

[0038] Figure 5 is the structural schematic diagram of the upper die base part in this application.

[0039] Figure 6 is the structural schematic diagram of the lower die base part in this application.

[0040] Figure 7 is Figure 5 the enlarged view of part A in

[0041] Figure 8 It is a cross-sectional view of the upper die holder part.

[0042] Explanation of reference numerals:

[0043] 1. Unwinding unit; 2. Rewinding unit; 3. Cutting table; 4. First cutting unit; 41. Upper die holder; 411. First cutting head; 412. Second cutting head; 413. Third cutting head; 414. Fracture; 42. Lower die holder; 421. Tool table; 422. First tool slot; 423. Second tool slot; 43. Die opening power component; 44. Top plate; 45. Bottom plate; 46. Slide shaft; 47. Pressure plate; 471. T-shaped hanging groove; 472. T-shaped hanging rod; 473. Return spring; 48. Support boss; 5. Second cutting unit; 6. Roller assembly; 100. Steel strip; 101. Steel sheet body; 102. Strip groove; 103. Assembly hole. Specific implementation manners

[0044] The following will Figures 1-8 make a further detailed description of this application in conjunction with the attached drawings.

[0045] The embodiment of this application discloses a headphone elastic sheet cutting device.

[0046] Referring to Figure 1 and Figure 2 wherein, Figure 1 is the flat blank to be processed in this application, and Figure 2 is the finished steel strip elastic sheet formed after bending and shaping the flat blank. Among them, the flat blank includes a steel sheet body 101, a strip groove 102 formed in the middle of the steel sheet body 101, and assembly holes 103 formed on both sides of the strip groove 102.

[0047] Referring to Figure 3 A headphone elastic sheet cutting device includes an unwinding unit 1 and a rewinding unit 2. Among them, a cutting table 3 is installed between the unwinding unit 1 and the rewinding unit 2, and a first cutting unit 4 and a second cutting unit 5 are sequentially arranged on the cutting table 3. During the working process, the steel strip 100 unwound by the unwinding unit 1 is sequentially input into the first cutting unit 4 and the second cutting unit 5 on the cutting table 3 for cutting treatment. Among them, the first cutting unit 4 punches out a flat blank on the steel strip 100, and there is a connection point reserved between the flat blank and the steel strip 100 after punching, so that after the die is opened, the flat blank can remain inside the steel strip 100 through this connection point. Then, the second cutting unit 5 cuts off the reserved connection point between the flat blank and the steel strip 100, so that the flat blank is separated from the steel strip 100 to obtain a finished flat blank. After that, the waste steel strip 100 from which the flat blank has been separated is then transported to the rewinding unit 2 for rewinding.

[0048] Referring to Figure 3, in this embodiment, roller assemblies 6 are installed on both sides of the cutting table 3. The roller assembly 6 includes two rows of rollers, upper and lower, and the two roller assemblies 6 are horizontally arranged in the input and output directions of the first cutting unit 4 and the second cutting unit 5 with respect to the steel strip 100, so as to control the horizontal feeding input and horizontal feeding output of the steel strip 100, thereby ensuring the horizontal feeding of the steel strip 100 between the first cutting unit 4 and the second cutting unit 5, and ensuring the subsequent cutting and forming effect.

[0049] Referring to Figure 4 , specifically, in this embodiment, the first cutting unit 4 includes an upper die base 41, a lower die base 42 and a die opening power component 43; wherein, the upper die base 41 and the lower die base 42 are arranged opposite to each other, a top plate 44 is arranged above the upper die base 41, a bottom plate 45 is arranged below the lower die base 42, and the lower die base 42 is fixedly installed on the bottom plate 45. Slide shafts 46 are arranged at the four corner positions between the top plate 44 and the bottom plate 45, and the bottom of the slide shaft 46 is fixedly connected to the bottom plate 45, and the top of the slide shaft 46 slidably passes through the lower die base 42 and the upper die base 41 and is then fixedly connected to the top plate 44. In this embodiment, the die opening power component 43 is a hydraulic cylinder, and the die opening power component 43 is fixedly installed downward on the top plate 44, and its piston rod end penetrates through the top plate 44 and is then fixedly connected to the top of the upper die base 41 to control the closing or opening of the upper die base 41 and the lower die base 42.

[0050] Referring to Figure 5 , the bottom of the upper die base 41 is respectively provided with a first cutter head 411, a second cutter head 412 and a third cutter head 413, and the first cutter head 411, the second cutter head 412 and the third cutter head 413 are respectively adapted to the strip-shaped groove 102, the assembly hole 103 and the outer contour of the steel sheet body 101 in the flat blank.

[0051] Referring to Figure 6 , correspondingly, a cutter table 421 adapted to the inner contour of the third cutter head 413 is formed on the top of the lower die base 42. A first cutter groove 422 and a second cutter groove 423 adapted to the first cutter head 411 and the second cutter head 412 are formed in the cutter table 421. Both the first cutter groove 422 and the second cutter groove 423 are through-shaped and penetrate through the bottom plate 45 at the same time, so that after the die is closed, the third cutter head 413 and the cutter table 421 are aligned to cut out the outer contour in the flat blank on the steel strip 100. At the same time, the first cutter head 411 and the second cutter head 412 are respectively aligned with the first cutter groove 422 and the second cutter groove 423 to punch out the strip-shaped groove 102 and the assembly hole 103 in the flat blank.

[0052] Referring to Figure 7, in the present application, a notch 414 is preset in the third cutter head 413, that is, the third cutter head 413 is formed into an annular blade shape with a notch. Therefore, after the third cutter head 413 is aligned and blanked with the tool table 421, the flat blank can form a connection point with the steel strip 100 at this position, so that after the flat blank is cut and the mold is opened, it can stay inside the steel strip 100 through this connection point. In this process, there is no need to consider the problem of taking out the flat blank. Therefore, the first cutting unit 4 can perform continuous blanking work, and its blanking efficiency is relatively high.

[0053] Preferably, in this embodiment, the preset notch 414 in the third cutter head 413 is located at the middle position. On the one hand, since the middle of the third cutter head 413 is a straight segment, and both of its ends are arc segments, if the position of the preset notch 414 in the third cutter head 413 is arranged at the two ends, it is not convenient for the subsequent second cutting unit 5 to cut the reserved connection point formed by it. On the other hand, during the earphone assembly process, the ear cups need to be installed at both ends of the steel strip elastic piece so that it can automatically adjust according to the wearer's head shape during use. If the position of the preset notch 414 in the third cutter head 413 is arranged at the two ends, it means that after the second cutting unit 5 cuts it, additional fine grinding is required to ensure the smooth adjustment after assembly, and this also means that more grinding work needs to be invested, which is more time-consuming and laborious. On the contrary, arranging the position of the preset notch 414 in the third cutter head 413 at the middle position will not affect the subsequent adjustment of the ear cups (because the ear cups on both sides only need to be adjusted along the two ends of the steel strip elastic piece), that is, after the second cutting unit 5 cuts it, there is no need for additional fine grinding, which can reduce the investment in unnecessary processes.

[0054] Refer to Figure 8 , in this embodiment, the heights of the third cutter head 413, the second cutter head 412, and the first cutter head 411 increase in sequence. The height difference between the first cutter head 411 and the second cutter head 412 is set as ∆x1, the height difference between the second cutter head 412 and the third cutter head 413 is set as ∆x2, and the thickness of the steel strip 100 to be blanked is set as d. Then both ∆x1 and ∆x2 are greater than d. Preferably, d + 1mm < ∆x1 < d + 3mm, and d + 1mm < ∆x2 < d + 3mm.

[0055] The heights of the third cutting head 413, the second cutting head 412, and the first cutting head 411 are set to increase in sequence. This means that during the punching process, the first cutting head 411 contacts the steel strip 100 first to punch holes, followed by the second cutting head 412, and finally the third cutting head 413. Secondly, since the height difference ∆x1 between the first cutting head 411 and the second cutting head 412 and the height difference ∆x2 between the second cutting head 412 and the third cutting head 413 are both greater than the thickness d of the steel strip 100, that is, after the first cutting head 411 punches through the steel strip 100, the second cutting head 412 starts punching, and then after the second cutting head 412 punches through the steel strip 100, the third cutting head 413 starts punching.

[0056] Therefore, during the whole process, the three cutting heads punch in sequence, and there is no situation where multiple cutting heads simultaneously perform punching on the steel strip 100. This independent punching method can reduce the mutual influence of different cutting heads during the punching process to ensure the punching quality. Otherwise, if the three cutting heads punch simultaneously, it means that the steel strip 100 needs to deform and split simultaneously at three positions, which easily causes deformation of the punched product.

[0057] In addition, the first cutting head 411, the second cutting head 412, and the third cutting head 413 perform punching in sequence, which is also considered in terms of the type of cutting head. Among them, the cutting surface of the first cutting head 411 is relatively large. After punching, it can position and stabilize this position, and during the punching processes of the subsequent second cutting head 412 and third cutting head 413, it is not easy to have an impact on them. On the contrary, if the first cutting head 411 is placed behind the second cutting head 412 (that is, the second cutting head 412 punches first and then the first cutting head 411), since the second cutting head 412 is relatively small, the deformation of the steel strip 100 caused by the first cutting head 411 during the punching process is likely to affect the second cutting head 412, and it will wear or even damage the second cutting head 412.

[0058] Refer to Figure 3 and Figure 8 In this embodiment, a pressure plate 47 is further installed at the bottom of the upper die base 41, and the pressure plate 47 is arranged on the left and right sides of the third cutting head 413. T-shaped hanging grooves 471 are formed at the left and right sides of the third cutting head 413 inside the upper die base 41, and the upper and lower ends of the T-shaped hanging grooves 471 penetrate through the upper and lower end faces of the upper die base 41 respectively. A T-shaped hanging rod 472 is slidably installed in the T-shaped hanging groove 471. The bottom of the T-shaped hanging rod 472 extends out of the T-shaped hanging groove 471 and is fixedly connected to the top of the pressure plate 47. A part of the bottom of the T-shaped hanging rod 472 extending out of the T-shaped hanging groove 471 is sleeved with a return spring 473, and the bottom of the return spring 473 presses against the top of the pressure plate 47, enabling the pressure plate 47 to perform elastic lifting.

[0059] Correspondingly, the lower die base 42 is provided with support bosses 48 on both sides of the tool post 421. The support bosses 48 are arranged opposite to the pressure plate 47, and the top surface of the support boss 48 is flush with the top surface of the tool post 421.

[0060] During the mold closing process, as the upper die base 41 moves downward, the pressure plate 47 first presses tightly on both sides of the steel strip 100 in the blanking position. At the same time, as the upper die base 41 continues to move downward, the return spring 473 in the T-shaped hanging groove 471 is compressed, so as to continuously increase the pressing force of the pressure plate 47 on the steel strip 100, so as to achieve pre-elastic pressing of the peripheral position of the steel strip 100 in the blanking position before blanking, so as to improve the forming effect after blanking. Similarly, after the mold is opened, under the action of the return spring 473, the pressure plate 47 is reset.

[0061] In other embodiments, the pressure plate 47 can be directly installed at the bottom of the upper die base 41 by means of a damping rod, so as to realize the elastic lifting installation of the pressure plate 47, which will not be elaborated here.

[0062] Refer to Figure 3 , specifically, in this embodiment, the second cutting unit 5 is a laser cutting device.

[0063] Since the cutting objects of the second cutting unit 5 and the first cutting unit 4 are both on the same steel strip 100, its cutting efficiency depends on the slowest step of the two. Only after both complete the cutting action can the steel be dragged to move for the next cutting cycle. Therefore, if the cutting of the second cutting unit 5 is too slow, it will affect the cutting efficiency of the first cutting unit 4.

[0064] In the cutting of the second part, the part to be cut is only the reserved connection point between the cut flat blank and the steel strip 100, and the cutting part is relatively small. Therefore, using the laser method for cutting can also ensure that the cutting process is completed in a short time without affecting the cutting efficiency of the first cutting unit 4. At the same time, it can also take into account the advantages of laser cutting to obtain flat blanks with better forming effects.

[0065] The implementation principle is as follows:

[0066] During the working process, the steel strip 100 unrolled by the uncoiling unit 1 is guided by the roller assembly 6 on the left side of the cutting table 3 and then fed into the cutting table 3 horizontally in sequence.

[0067] Then, it is successively subjected to cutting processes by the first cutting unit 4 and the second cutting unit 5 on the cutting table 3. Among them, during the mold closing process of the first cutting unit 4, the strip-shaped groove 102, the assembly hole 103, and the outer contour of the steel sheet body 101 in the flat blank are respectively cut out by the first cutting head 411, the second cutting head 412, and the third cutting head 413. At the same time, by using the preset notch 414 in the third cutting head 413, a connection point for connecting with the steel strip 100 is formed at this position on the cut flat blank through the notch 414, so that after the mold is opened, the flat blank can remain inside the steel strip 100 through this connection point. Then, it is conveyed to the second cutting unit 5, and the second cutting unit 5 cuts off the reserved connection point between the flat blank and the steel strip 100 by means of laser cutting, so as to obtain a finished flat blank by separating the flat blank from the steel strip 100.

[0068] After that, the waste steel strip 100 from which the flat blank has been separated is guided by the roller assembly 6 on the right side of the cutting table 3 and then conveyed to the winding unit 2 for winding.

[0069] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A headphone elastic sheet cutting device, characterized in that: It includes an unwinding unit (1) and a winding unit (2) for unwinding and winding a steel strip (100); a cutting table (3) is installed between the unwinding unit (1) and the winding unit (2), and a first cutting unit (4) and a second cutting unit (5) are sequentially arranged on the cutting table (3). The first cutting unit (4) is used to punch a flat blank on the steel strip (100), and a connection point is reserved between the flat blank and the steel strip (100); the second cutting unit (5) is used to cut off the reserved connection point between the flat blank and the steel strip (100). The first cutting unit (4) includes an upper die base (41), a lower die base (42) and a die-opening power component (43). The lower die base (42) is fixed on the cutting table (3), and the die-opening power component (43) is used to control the upper die base (41) and the lower die base (42) to close or open the die; a first cutting head (411), a second cutting head (412) and a third cutting head (413) are respectively arranged on the upper die base (41). The first cutting head (411), the second cutting head (412) and the third cutting head (413) are respectively adapted to the strip-shaped groove (102), the assembly hole (103) and the outer contour of the steel sheet body (101) in the flat blank, and a notch (414) is preset in the third cutting head (413); a tool rest (421) adapted to the inner contour of the third cutting head (413) is formed on the top of the lower die base (42), and a first tool groove (422) and a second tool groove (423) respectively adapted to the first cutting head (411) and the second cutting head (412) are formed in the tool rest (421), and both the first tool groove (422) and the second tool groove (423) are through-shaped.

2. The earphone elastic sheet cutting device according to claim 1, characterized in that: The notch (414) preset in the third cutting head (413) is located at the middle position.

3. An earphone elastic sheet cutting device according to claim 1, characterized in that: The heights of the third cutting head (413), the second cutting head (412) and the first cutting head (411) increase in sequence. Let the height difference between the first cutting head (411) and the second cutting head (412) be ∆x1, the height difference between the second cutting head (412) and the third cutting head (413) be ∆x2, and the thickness of the steel strip (100) to be punched be d. Then both ∆x1 and ∆x2 are greater than d.

4. The earphone elastic sheet cutting device according to claim 3, characterized in that: d + 1mm < ∆x1 < d + 3mm, and d + 1mm < ∆x2 < d + 3mm.

5. The earphone shrapnel cutting device according to claim 2, characterized in that: A pressure plate (47) is further installed at the bottom of the upper die base (41). The pressure plate (47) is arranged on the left and right sides of the third cutting head (413) and can be elastically lifted and lowered; support bosses (48) are arranged on both sides of the tool rest (421) of the lower die base (42). The support bosses (48) are arranged opposite to the pressure plate (47), and the top surface of the support bosses (48) is flush with the top surface of the tool rest (421).

6. The earphone elastic sheet cutting device according to claim 5, characterized in that: Inside the upper die holder (41), T-shaped suspension grooves (471) are formed on both the left and right sides of the third cutter head (413), and the upper and lower ends of the T-shaped suspension grooves (471) penetrate through the upper and lower end faces of the upper die holder (41) respectively; a T-shaped suspension rod (472) is slidably installed in the T-shaped suspension groove (471), and the bottom of the T-shaped suspension rod (472) extends out of the T-shaped suspension groove (471) and is fixedly connected to the top of the pressure plate (47); a part of the bottom of the T-shaped suspension rod (472) extending out of the T-shaped suspension groove (471) is sleeved with a return spring (473), and the bottom of the return spring (473) is pressed against the top of the pressure plate (47).

7. A headphone elastic sheet cutting device according to claim 1, characterized in that: The second cutting unit (5) is a laser cutting device.

8. The earphone elastic sheet cutting device according to claim 1, characterized in that: Roller assemblies (6) are installed on both the input and output sides of the cutting table (3). The roller assemblies (6) include two rows of rollers, which are respectively used to control the horizontal feeding input and horizontal feeding output of the steel strip (100).

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