Earphone elastic piece cutting device

Abstract

The invention relates to the technical field of earphone elastic pieces, in particular to an earphone elastic piece cutting device which comprises 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. In the working process, the steel belt unwound by the unwinding unit is input into the first cutting unit, so that a flat blank is punched on the steel belt, and meanwhile, a connecting point is reserved between the flat blank and the steel belt and is reserved in the steel belt. And then, the second cutting unit cuts off the connecting point, so that the flat blank is separated from the steel belt, and a finished product of the flat blank is obtained. And then, the steel strip waste separated from the flat blank is conveyed to the rolling unit to be rolled. According to the steel strip elastic piece cutting device, the flat blank of the needed steel strip elastic piece is obtained through cutting in two steps, the flat blank is cut in the steel strip only in the second step, it can be guaranteed that the first cutting unit can work continuously in the first step, and the overall working efficiency is high.

Description

Technical Field

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

[0002] Among all kinds of headphones, headphones have more obvious characteristics. Since they can surround the ears, provide good sound insulation and are suitable for long-term wear, they are often used for high-quality audio experience, such as music, movies, games, etc.

[0003] Among them, the steel bar spring is the main supporting structure of the headband in the headset, which can usually provide sufficient elasticity so that the headband of the headset can be automatically adjusted according to the wearer's head shape, thereby providing a comfortable wearing experience.

[0004] Reference Figure 1 and Figure 2 ,in, Figure 1 It is the flat blank required for processing in this application, and Figure 2 The flat blank is formed into a steel strip spring finished product after bending and shaping. 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.

[0005] At present, in the processing process, it is usually necessary to use a punch press to continuously punch out the steel sheet body on the steel strip one by one, and then use other punch presses to punch out the corresponding strip grooves and assembly holes to obtain a flat blank, and finally use a rolling machine to shape it so that it forms the required arc-shaped steel strip spring after gradual deformation.

[0006] However, in the process of making flat blanks, the process steps involved are relatively complicated and cumbersome, the processing efficiency is relatively low, and it requires not only a lot of manpower and material resources, but also a long processing cycle. Therefore, further improvements can be made. Summary of the invention

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

[0008] The present application provides an earphone shrapnel cutting device that adopts the following technical solution: A headphone shrapnel cutting device comprises a unwinding unit and a rewinding unit, which are used for unwinding and rewinding a steel strip; a cutting table is installed between the unwinding unit and the rewinding unit, and a first cutting unit and a second cutting unit are sequentially arranged on the cutting table, the first cutting unit is used for punching out 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 for cutting off the reserved connection point between the flat blank and the steel strip.

[0009] 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 processing, wherein the first cutting unit punches out a flat blank on the steel strip, and since a connection point is reserved between the flat blank and the steel strip after punching, the flat blank can be kept inside the steel strip through the connection point after the mold is opened. Afterwards, 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 flat blank finished product, and then the steel strip waste separated from the flat blank is then transported to the winding unit for winding. Therefore, the present application can use the first cutting unit and the second cutting unit to directly obtain the required flat blank of the steel strip spring on the steel strip. In addition, the second cutting unit is used to cut and separate the flat blank in the steel strip in the second step, which can ensure that the first cutting unit can work continuously in the first step, and its overall work efficiency is relatively high. Otherwise, if direct cutting is performed in the first step, the first cutting unit needs to be stopped after each cutting, and then the flat blank can be taken out before the next cycle of cutting can be performed, which is very inefficient.

[0010] Optionally, the first cutting unit includes an upper die base, a lower die base and a mold opening power component, the lower die base is fixed to the cutting table, and the mold opening power component is used to control the upper die base and the lower die base to close or open the mold; 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 the third cutter head is preset with a fracture; a cutter table adapted to the inner contour of the third cutter head is formed on the top of the lower die base, and a first cutter groove and a second cutter groove adapted to the first cutter head and the second cutter head are formed in the cutter table, and the first cutter groove and the second cutter groove are both through-shaped.

[0011] By adopting the above technical solution, during the first cutting process, after the upper die seat and the lower die seat are closed, the third cutter head is matched with the cutter table to cut out the outer contour of the flat blank on the steel strip. At the same time, the first cutter head and the second cutter head are matched with the first knife groove and the second knife groove respectively to punch out the strip groove and assembly hole in the flat blank. In addition, since the third cutter head is preset with a fracture, a connection point is formed between the two at this position, so that the flat blank after cutting can be kept inside the steel strip through the connection point after the mold is opened. Therefore, in this process, there is no need to consider the problem of taking out the flat blank, so the first cutting unit can perform continuous punching work with high punching efficiency.

[0012] Optionally, the preset fracture in the third cutting head is located in the middle.

[0013] 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 thereof are arc segments, if the preset break position in the third cutter head is arranged at the two end positions, it is not convenient for the subsequent second cutting unit to cut off the reserved connection points formed by it. On the other hand, during the assembly of the earphone, the earmuffs need to be installed at the two ends of the steel bar shrapnel so that they can be automatically adjusted according to the wearer's head shape during use. If the preset break position in the third cutter head is arranged at the two end positions, it means that after the second cutting unit cuts, it needs to be finely polished to ensure the smoothness of adjustment after assembly, which also means that more polishing work needs to be invested, which is more time-consuming and labor-intensive. On the contrary, arranging the preset break position in the third cutter head in the middle position will not affect the subsequent adjustment of the earmuffs (because the earmuffs on both sides only need to be adjusted along the two end positions of the steel bar shrapnel), that is, after the second cutting unit cuts, it does not need to be finely polished, which can reduce the investment in unnecessary processes.

[0014] Optionally, the heights of the third cutter head, the second cutter head, and the first cutter head increase sequentially, and the height difference between the first cutter head and the second cutter head is set to ∆x1, the height difference between the second cutter head and the third cutter head is set to ∆x2, and the required thickness of the punched steel strip is set to d, then ∆x1 and ∆x2 are both greater than d.

[0015] 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 for punching, 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, the second cutter head starts punching after the first cutter head punches through the steel strip, and then the third cutter head starts punching after the second cutter head punches through the steel strip.

[0016] Therefore, in the whole process, the three cutter heads perform punching successively, and there is no situation where multiple cutter heads punch with the steel strip at the same time. This independent punching method can reduce the mutual influence of different cutter heads during the punching process to ensure the punching quality. Otherwise, if the three cutter heads punch at the same time, it means that the steel strip needs to be deformed and cut at three positions at the same time, which is easy to cause deformation of the punched product.

[0017] In addition, the first cutting head, the second cutting head, and the third cutting head perform punching and cutting in sequence. This is also considered in view of their cutting head types. Among them, the cutting surface of the first cutting head is relatively large. After punching and cutting, it can position and stabilize this position, and during the punching and cutting processes of the subsequent second and third cutting heads, it is not easy to affect 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 thin, the deformation of the steel strip caused by the first cutting head during the punching and cutting process is likely to affect the second cutting head, and it will wear or even break the second cutting head.

[0018] Optionally, d + 1mm < ∆x1 < d + 3mm, and d + 1mm < ∆x2 < d + 3mm.

[0019] By adopting the above technical solution, setting the values of ∆x1 and ∆x2 between d + 1mm and d + 3mm has a better effect.

[0020] 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 be elastically lifted and lowered. Support bosses are provided on both sides of the cutting table of the lower die base. 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 cutting table.

[0021] 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 elastically pressed against the peripheral position of the steel strip at the punching position to preliminarily press it, so as to improve the forming effect after punching.

[0022] 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 return spring is sleeved on the part of the bottom of the T-shaped hanging rod that extends out of the T-shaped hanging groove, and the bottom of the return spring is pressed against the top of the pressure plate.

[0023] By adopting the above technical solution, during the die closing process, as the upper die base moves downward, the pressure plate first presses against both sides of the steel strip at the punching position. At the same time, as the upper die 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 pre-elastic pressing of the peripheral position of the steel strip at the punching position before punching. Similarly, after the die is opened, under the action of the return spring, the pressure plate is reset.

[0024] Optionally, the second cutting unit is a laser cutting device.

[0025] By adopting the above technical solution, because the cutting object of the second cutting unit and the cutting object of the first cutting unit are both on the same steel belt, their cutting efficiency depends on the slowest step of the two. Only after both have completed the cutting action can the steel be dragged to move and the next cutting cycle can 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.

[0026] In the second cutting process, the cutting part is only to cut the reserved connection point between the flat blank and the steel strip, and the cutting part is relatively small. Therefore, the cutting process can be completed in a short time by using laser cutting, without affecting the cutting efficiency of the first cutting unit. At the same time, the advantages of laser cutting can be taken into account to obtain a flat blank with a better forming effect.

[0027] Optionally, roller assemblies are installed on both sides of the input and output of the cutting table, and the roller assemblies include upper and lower rows of rollers, which are respectively used to control the horizontal guiding input and horizontal guiding output of the steel belt.

[0028] By adopting the above technical solution, roller assemblies are installed on the input and output sides of the cutting table to control the horizontal input and horizontal output of the steel belt, thereby ensuring that the steel belt is horizontally guided between the first cutting unit and the second cutting unit to ensure the subsequent cutting and forming effect.

[0029] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application can use the first cutting unit and the second cutting unit to directly obtain the required flat blanks of steel strip shrapnel on the steel strip. In addition, the second cutting unit is used to cut and separate the flat blanks in the steel strip in the second step, which can ensure that the first cutting unit can work continuously in the first step, and its overall work efficiency is relatively high. Otherwise, if direct cutting is performed in the first step, the first cutting unit needs to be stopped after each cutting, and then the flat blanks need to be taken out before the next cycle of cutting can be performed, which is very inefficient; 2. During the first cutting process, after the upper and lower mold bases are closed, the third cutter head is matched with the knife table to cut out the outer contour of the flat blank on the steel strip. At the same time, the first cutter head and the second cutter head are matched with the first knife groove and the second knife groove respectively to punch out the strip groove and assembly hole in the flat blank. In addition, since the third cutter head is preset with a fracture, a connection point is formed between the two at this position, so that the flat blank after cutting can be kept inside the steel strip through the connection point after the mold is opened. Therefore, in this process, there is no need to consider the problem of taking out the flat blank, so the first cutting unit can perform continuous punching work with high punching efficiency; 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 first contacts the steel strip for punching, 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 punch, and then after the second cutter head punches through the steel strip, the third cutter head starts to punch. Therefore, during the entire process, the three cutter heads punch successively, and there is no situation where multiple cutter heads punch with the steel strip at the same time. This independent punching method can reduce the mutual influence of different cutter heads during the punching process to ensure the punching quality. Otherwise, if the three cutter heads punch at the same time, it means that the steel strip needs to be deformed and cut at three locations at the same time, which is easy to cause deformation of the punched product. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is the flat blank required to be processed in this application.

[0031] Figure 2 It is a finished steel bar spring piece formed by bending and shaping a flat blank.

[0032] Figure 3 It is a schematic diagram of the overall structure of an earphone shrapnel cutting device of the present application.

[0033] Figure 4 It is a structural schematic diagram of the first cutting unit in this application.

[0034] Figure 5 It is a structural schematic diagram of the upper die base part in this application.

[0035] Figure 6 It is a structural schematic diagram of the lower mold base part in this application.

[0036] Figure 7 yes Figure 5 Enlarged view of part A.

[0037] Figure 8 This is a cross-sectional view of the upper die seat.

[0038] Description of reference numerals: 1. Unwinding unit; 2. Rewinding unit; 3. Cutting table; 4. First cutting unit; 41. Upper die seat; 411. First cutter head; 412. Second cutter head; 413. Third cutter head; 414. Fracture; 42. Lower die seat; 421. Knife table; 422. First knife groove; 423. Second knife groove; 43. Mold opening power part; 44. Top plate; 45. Bottom plate; 46. Sliding shaft; 47. Pressing plate; 471. T-shaped hanging groove; 472. T-shaped hanging rod; 473. Reset spring; 48. Supporting boss; 5. Second cutting unit; 6. Roller assembly; 100. Steel belt; 101. Steel sheet body; 102. Strip groove; 103. Assembly hole. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-8 This application is described in further detail.

[0040] The embodiment of the present application discloses a device for cutting earphone shrapnel.

[0041] Reference Figure 1 and Figure 2 ,in, Figure 1 It is the flat blank required for processing in this application, and Figure 2 The flat blank is formed into a steel strip spring finished product after bending and shaping. 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.

[0042] Reference Figure 3 A headphone shrapnel cutting device includes an unwinding unit 1 and a rewinding unit 2, wherein 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 unwinding 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 processing, wherein the first cutting unit 4 punches out a flat blank on the steel strip 100, and a connection point is reserved between the flat blank and the steel strip 100 after punching, so that the flat blank can be kept in the steel strip 100 through the connection point after the mold is opened. 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 flat blank finished product, and then, the waste steel strip 100 separated from the flat blank is then fed to the rewinding unit 2 for rewinding.

[0043] Reference Figure 3In this embodiment, roller assemblies 6 are installed on both sides of the cutting table 3. The roller assemblies 6 include two upper and lower rows of rollers, and the two groups of roller assemblies 6 are horizontally arranged with the steel belt 100 in the input and output directions of the first cutting unit 4 and the second cutting unit 5 to control the horizontal guiding input and horizontal guiding output of the steel belt 100, thereby ensuring the horizontal guiding of the steel belt 100 between the first cutting unit 4 and the second cutting unit 5 to ensure the subsequent cutting and forming effect.

[0044] Reference 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 member 43; wherein the upper die base 41 is arranged opposite to the lower die base 42, 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 mounted on the bottom plate 45. Sliding shafts 46 are arranged at the four corners between the top plate 44 and the bottom plate 45, and the bottom of the sliding shaft 46 is fixedly connected to the bottom plate 45, and the top of the sliding shaft 46 is slidably penetrated through the lower die base 42 and the upper die base 41 and then fixedly connected to the top plate 44. In this embodiment, the die opening power member 43 is a hydraulic cylinder, and the die opening power member 43 is fixedly mounted on the top plate 44 downward, and its piston rod end penetrates through the top plate 44 and then is fixedly connected to the top of the upper die base 41, so as to control the upper die base 41 and the lower die base 42 to close or open the mold.

[0045] Reference Figure 5 The bottom of the upper die seat 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 groove 102, the assembly hole 103 and the outer contour of the steel sheet body 101 in the flat blank.

[0046] Reference Figure 6 Correspondingly, a tool table 421 adapted to the inner contour of the third cutter head 413 is formed on the top of the lower die seat 42, and a first knife groove 422 and a second knife groove 423 adapted to the first cutter head 411 and the second cutter head 412 are formed in the tool table 421, and the first knife groove 422 and the second knife groove 423 are both through-shaped and penetrate through the bottom plate 45 at the same time, so that after the mold is closed, the third cutter head 413 is matched with the tool table 421 to cut out the outer contour of the flat blank on the steel strip 100, and at the same time, the first cutter head 411 and the second cutter head 412 are matched with the first knife groove 422 and the second knife groove 423 respectively to punch out the strip groove 102 and the assembly hole 103 in the flat blank.

[0047] Reference 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 and the cutter table 421 are aligned and blanked, 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.

[0048] Preferably, in this embodiment, the notch 414 preset 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 ends are arc segments, if the position of the notch 414 preset in the third cutter head 413 is arranged at both ends, it is not convenient for the subsequent second cutting unit 5 to cut the reserved connection points 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 spring piece so that it can automatically adjust according to the wearer's head shape during use. If the position of the notch 414 preset in the third cutter head 413 is arranged at both ends, it means that after the second cutting unit 5 cuts, additional fine grinding is required to ensure the smooth adjustment during use 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 notch 414 preset 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 spring piece), that is, after the second cutting unit 5 cuts, there is no need to perform additional fine grinding on it, which can reduce the investment in unnecessary processes.

[0049] 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.

[0050] The heights of the third cutter head 413, the second cutter head 412, and the first cutter head 411 are set to increase in sequence, which means that during the punching process, the first cutter head 411 first contacts the steel strip 100 for punching, followed by the second cutter head 412, and finally the third cutter head 413. Secondly, since the height difference ∆x1 between the first cutter head 411 and the second cutter head 412, and the height difference ∆x2 between the second cutter head 412 and the third cutter head 413 are both greater than the thickness d of the steel strip 100, that is, after the first cutter head 411 punches through the steel strip 100, the second cutter head 412 starts to punch, and then after the second cutter head 412 punches through the steel strip 100, the third cutter head 413 starts to punch.

[0051] Therefore, in the whole process, the three cutter heads perform punching successively, and there is no situation where multiple cutter heads punch the steel strip 100 at the same time. This independent punching method can reduce the mutual influence of different cutter heads during the punching process to ensure the punching quality. Otherwise, if the three cutter heads punch at the same time, it means that the steel strip 100 needs to be deformed and cut at three positions at the same time, which is easy to cause deformation of the punched product.

[0052] In addition, the first cutter head 411, the second cutter head 412, and the third cutter head 413 are punched in sequence, which is also considered in consideration of the cutter head type. Among them, the punching surface of the first cutter head 411 is relatively large, and after punching, the position can be positioned and stabilized, and it is not easy to be affected by the punching process of the second cutter head 412 and the third cutter head 413. On the contrary, if the first cutter head 411 is placed behind the second cutter head 412 (that is, the second cutter head 412 punches first, and the first cutter head 411 punches later), since the second cutter head 412 is relatively small, the deformation of the steel strip 100 caused by the first cutter head 411 during the punching process is easy to affect the second cutter head 412, which will wear or even break the second cutter head 412.

[0053] Reference Figure 3 and Figure 8 In this embodiment, a pressing plate 47 is also installed at the bottom of the upper die seat 41, and the pressing plate 47 is arranged on the left and right sides of the third cutter head 413. T-shaped hanging grooves 471 are formed inside the upper die seat 41 at the left and right sides of the third cutter head 413, and the upper and lower ends of the T-shaped hanging groove 471 respectively penetrate the upper and lower end surfaces of the upper die seat 41. A T-shaped hanging rod 472 is slidably installed in the T-shaped hanging groove 471, and 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 pressing plate 47. The part of the bottom of the T-shaped hanging rod 472 extending out of the T-shaped hanging groove 471 is sleeved with a reset spring 473, and the bottom of the reset spring 473 is pressed against the top of the pressing plate 47, so that the pressing plate 47 can be elastically lifted and lowered.

[0054] Correspondingly, the lower die base 42 is provided with supporting bosses 48 on both sides of the tool platform 421 . The supporting bosses 48 are arranged opposite to the pressing plate 47 , and the top surface of the supporting bosses 48 is flush with the top surface of the tool platform 421 .

[0055] During the mold closing process, as the upper mold base 41 moves downward, the pressing plate 47 first presses on both sides of the steel strip 100 at the punching position. At the same time, as the upper mold base 41 continues to move downward, the return spring 473 in the T-shaped hanging groove 471 is compressed to continuously increase the pressing force of the pressing plate 47 on the steel strip 100, so as to achieve pre-elastic compression of the peripheral position of the steel strip 100 at the punching position before punching, so as to improve the forming effect after punching. Similarly, after the mold is opened, the pressing plate 47 is reset under the action of the return spring 473.

[0056] In other embodiments, the pressing plate 47 can be directly installed on the bottom of the upper mold base 41 by means of a damping rod, so that the pressing plate 47 can be elastically lifted and lowered, which will not be described in detail here.

[0057] Reference Figure 3 Specifically, in this embodiment, the second cutting unit 5 is a laser cutting device.

[0058] Because the cutting object of the second cutting unit 5 and the cutting object of the first cutting unit 4 are both on the same steel strip 100, the cutting efficiency depends on the slowest step of the two. Only after both have completed the cutting action can the steel material be dragged to move for the next cutting cycle. Therefore, if the cutting of the second cutting unit 5 is too slow, the cutting efficiency of the first cutting unit 4 will be affected.

[0059] In the second cutting, the cutting part is only to cut the reserved connection point between the flat blank and the steel strip 100, and the cutting part is relatively small. Therefore, cutting by laser can 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, the advantages of laser cutting can be taken into account to obtain a flat blank with a better forming effect.

[0060] The implementation principle is: During operation, the steel strip 100 unrolled by the unrolling unit 1 is guided by the roller assembly 6 on the left side of the cutting table 3 and then guided in sequence along the horizontal direction to be input into the cutting table 3 .

[0061] Then, the flat blank is cut by the first cutting unit 4 and the second cutting unit 5 on the cutting table 3. In the process of mold closing, the first cutting unit 4 uses the first cutter head 411, the second cutter head 412 and the third cutter head 413 to cut out the strip groove 102, the assembly hole 103 and the outer contour of the steel sheet body 101 in the flat blank respectively. At the same time, the preset fracture 414 in the third cutter head 413 is used to form a connection point with the steel strip 100 at this position through the fracture 414, so that the flat blank can be kept in the steel strip 100 through the connection point after mold opening. Then, it is transported 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 laser cutting, so that the flat blank is separated from the steel strip 100 to obtain a finished flat blank.

[0062] Afterwards, the waste steel strip 100 separated from the flat blank is guided by the roller assembly 6 on the right side of the cutting table 3 and then transported to the winding unit 2 for winding.

[0063] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A headphone shrapnel 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 for punching a flat blank on the steel strip (100), and leaving a connection point between the flat blank and the steel strip (100); the second cutting unit (5) is used for cutting off the reserved connection point between the flat blank and the steel strip (100).

2. The earphone shrapnel cutting device according to claim 1, characterized in that: 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 for controlling the upper die base (41) and the lower die base (42) to close or open the die; a first cutter head (411), a second cutter head (412) and a third cutter head (413) are respectively arranged on the upper die base (41). 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, and a notch (414) is preset in the third cutter head (413); a tool post (421) adapted to the inner contour of the third cutter head (413) is formed at 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 cutter head (411) and the second cutter head (412) are formed in the tool post (421), and both the first tool groove (422) and the second tool groove (423) are through-shaped.

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

4. The earphone shrapnel cutting device according to claim 2, characterized in that: The heights of the third cutter head (413), the second cutter head (412) and the first cutter head (411) increase in sequence. Let the height difference between the first cutter head (411) and the second cutter head (412) be ∆x1, the height difference between the second cutter head (412) and the third cutter 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.

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

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

7. The earphone shrapnel cutting device according to claim 6, characterized in that: The upper die seat (41) is internally provided with T-shaped hanging grooves (471) at the left and right sides of the third cutting head (413), and the upper and lower ends of the T-shaped hanging grooves (471) respectively penetrate the upper and lower end surfaces of the upper die seat (41); a T-shaped hanging rod (472) is slidably installed in the T-shaped hanging groove (471), and 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); the 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) is pressed tightly against the top of the pressure plate (47).

8. The earphone shrapnel cutting device according to claim 1, characterized in that: The second cutting unit (5) is a laser cutting device.

9. The earphone shrapnel cutting device according to claim 1, characterized in that: Roller assemblies (6) are installed on both sides of the input and output of the cutting table (3), and the roller assembly (6) includes two rows of rollers, one above the other, which are respectively used to control the horizontal guiding input and the horizontal guiding output of the steel belt (100).

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