Stamping method for hardware tableware

Abstract

The invention relates to a stamping method for hardware tableware, and belongs to the technical field of stamping of the hardware tableware. Comprising the following steps that S1, materials are prepared, specifically, tableware production materials are cut to form standard to-be-stamped plates; s2, feeding is conducted, specifically, the prepared materials are fed to a female die; s3, stamping is conducted, specifically, the male die is started for stamping, the plate is pressed on the female die through the male die, and a stainless steel tableware blank is obtained; s4, shaping is conducted, specifically, the stainless steel tableware blank is subjected to re-compression shaping, so that the shape of the stainless steel tableware is fixed; s5, blanking is conducted, specifically, the tableware is taken out of the female die, stamping is completed, and subsequent procedures are conducted; according to the hardware tableware stamping device, the problems that when existing hardware tableware is stamped, products are prone to cracking or deformation, and consequently the production efficiency and the production quality of the products are low are solved, meanwhile, the stamping production efficiency of the hardware tableware is improved, and material hardening and shape deviation caused by local overheating are avoided; and the stamping quality of the hardware tableware is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of hardware tableware stamping, and in particular relates to a method for stamping hardware tableware. Background Art

[0002] Whether in social canteens or school canteens, metal tableware is stamped. When producing these tableware using traditional production processes, the steel plates need to be cut into blocks, then stamped and polished.

[0003] During the stamping process, the tableware is processed and produced by combining the punch and the die. After the stamping is completed, the tableware needs to be taken out manually. However, during the stamping process, the tableware is usually made of stainless steel, aluminum and other materials. These materials have large surface friction during the stamping process, which easily forms adhesion between the mold and the tableware. When the tableware is pressed and formed, due to the strong friction between it and the mold surface, the finished product cannot fall off smoothly after the stamping is completed, causing jamming, thereby affecting the material feeding rate and reducing production efficiency. In addition, during the stamping process, when the metal material is compressed and deformed, the edges, curved parts or small feature areas of the tableware are subjected to greater stress concentration during stamping, which will generate friction heat. If the temperature is too high, it will cause the material to harden, resulting in deviations in the geometric shape of the tableware, so that the finished product fails to fully meet the design requirements after being ejected from the mold, affecting subsequent processing and use, and further reducing production efficiency. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a stamping method for hardware tableware, which solves the problem that the existing hardware tableware is prone to cracks or deformation in the product due to local overheating during the stamping process, resulting in low production efficiency and production quality of the product.

[0005] The purpose of the present invention can be achieved by the following technical solution: A method for punching hardware tableware, comprising the following steps:

[0006] S1: Prepare materials, cut the tableware production materials into standard plates to be stamped;

[0007] S2: Loading, loading the prepared material onto the die;

[0008] S3: stamping, starting the punch to stamp, pressing the sheet onto the die through the punch to obtain a stainless steel tableware blank;

[0009] S4: Shaping, re-pressing and shaping the stainless steel tableware blank to fix the shape of the stainless steel tableware;

[0010] S5: Cutting, taking the tableware out of the die to complete stamping and proceed to the subsequent process;

[0011] The die comprises a die frame and a lifting mechanism, wherein a plurality of profiling grooves corresponding to the punches are provided on the top surface of the die frame, and limiting steps are provided on the side walls of the bottom of the profiling grooves. The lifting mechanism is installed on the inner bottom surface of the profiling grooves, and a lifting end of the lifting mechanism slides in contact with the inner side wall of the profiling grooves and is located at the top of the profiling grooves. A plurality of through holes are provided on the inner side wall of the profiling grooves, and graphite is filled in the through holes. When stamping, the punches push the lifting end to contact the limiting steps.

[0012] As a preferred technical solution of the present invention, the lifting mechanism includes a lifting plate, a lifting spring and a guide column. The lifting plate is slidably fitted on the inner side wall of the profiling groove, the guide column is installed on the inner bottom surface of the profiling groove, the lifting spring is sleeved on the outside of the guide column, and the top surface of the lifting spring abuts against the bottom surface of the lifting plate. When the punch is stamped, it pushes the lifting plate to slide into the profiling groove and abut against the limit step and compress the lifting spring.

[0013] As a preferred technical solution of the present invention, a boss is provided on the bottom surface of the jacking plate, and a plurality of reinforcing ribs are provided on the outer side wall of the boss, one end of the reinforcing rib is located on the outer side wall of the boss, and the other end is located on the outer side wall of the top of the jacking plate.

[0014] As a preferred technical solution of the present invention, the outer side wall of the die is further provided with a heat dissipation mechanism, and the heat dissipation mechanism abuts against the graphite in the through hole.

[0015] As a preferred technical solution of the present invention, the heat dissipation mechanism includes a heat conducting plate and heat dissipation fins, one end of the heat conducting plate is installed on the outer wall of the die and abuts against the graphite in the through hole, and the heat dissipation fins are installed on the other end of the heat conducting plate.

[0016] As a preferred technical solution of the present invention, the mold frame is composed of a base and a limiting frame, the limiting frame is detachably installed on the top surface of the base, the through hole is opened on the limiting frame, and the limiting step is opened on the top surface of the base.

[0017] As a preferred technical solution of the present invention, a pressure sensor is provided on the bottom surface of the punch, and the pressure sensor is used to detect the punching pressure applied by the punch to the die when the punch is punching.

[0018] As a preferred technical solution of the present invention, the guide column is composed of an electromagnet, and when the guide column is energized, a magnetic force is generated to repel the lifting plate.

[0019] As a preferred technical solution of the present invention, the punch also includes a laser rangefinder, which is embedded in the side wall of the profiling groove and detects the tableware completed by the first punching, and the guide column adjusts the power-on current according to the detection value of the laser rangefinder.

[0020] The beneficial effects of the present invention are as follows: a lubricating film is formed between the tableware and the contoured groove by graphite to reduce friction, and the tableware is lifted from the die by a lifting mechanism, thereby avoiding the edge and curved part of the tableware from unfolding during secondary stamping, thereby increasing friction and making it difficult to remove the tableware. The problem that the existing hardware tableware is prone to cracks or deformation in the product due to local overheating during the stamping process, resulting in low production efficiency and production quality of the product, is solved. The material feeding process is smoother, and the stamping production efficiency of the hardware tableware is improved. The graphite lubricating film reduces the friction between the mold and the tableware, avoids material hardening and shape deviation caused by local overheating, ensures that the finished product meets the design requirements, and improves the stamping quality of the hardware tableware. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0022] Figure 1 is a flow chart of the stamping method of the present invention;

[0023] Figure 2 A schematic diagram of a mold structure for implementing the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the lifting mechanism of the present invention;

[0025] Figure 4 This is a schematic diagram of the second mold structure for implementing the present invention;

[0026] Main component symbols

[0027] In the figure: 1, punch; 2, die; 21, contour groove; 22, through hole; 3, mold frame; 31, base; 32, limit frame; 4, lifting mechanism; 41, lifting plate; 42, lifting spring; 43, guide column; 51, heat conduction plate; 52, heat sink fin. DETAILED DESCRIPTION

[0028] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0029] See also Figure 1-Figure 3 , this embodiment 1 provides a method for stamping hardware tableware, comprising the following steps:

[0030] S1: Prepare materials and cut the production materials of tableware into standard plates to be stamped, so as to ensure the consistency of tableware quality during subsequent stamping;

[0031] S2: Loading, loading the prepared material onto the die 2;

[0032] S3: stamping, starting the punch 1 to perform stamping, pressing the sheet onto the die 2 through the punch 1, and preliminarily obtaining a stainless steel tableware blank;

[0033] S4: Shaping, re-pressing and shaping the stainless steel tableware blank to fix the shape of the stainless steel tableware;

[0034] S5: unloading, taking the tableware out of the die 2 to complete the stamping and proceed to the subsequent process;

[0035] Because during the stamping process, when the metal is bent and deformed by external force, when the pressure on the metal sheet is less than its own elastic limit load and when the external force is released, the metal can return to its original shape. The elastic limit load is the maximum strength that the metal material can withstand while still maintaining elastic deformation and not causing plastic deformation or damage. When the applied pressure exceeds the yield point of the material, plastic deformation is formed, and the material will not be able to return to its original state. However, in the part below the yield point, the material will still rebound to a certain extent. During stamping, the shape and depth of the die 2 and the geometric characteristics of the tableware will affect the stress distribution of the material, thereby affecting the amount of rebound. The edges and corners are more likely to produce uneven rebound than the center position. Therefore, in order to ensure the processing quality of the tableware, after the first stamping, a second stamping is required to determine the shape of the tableware to ensure the processing quality of the tableware. The second stamping is used to reshape the position where the tableware has uneven rebound, reduce the deviation in the shape of the tableware due to uneven rebound, and thus improve the processing quality of the tableware.

[0036] The female die 2 includes a die frame 3 and a lifting mechanism 4. The top surface of the die frame 3 is provided with a plurality of profiling grooves 21 corresponding to the male die 1. The side walls of the bottom of the profiling grooves 21 are provided with limiting steps. The lifting mechanism 4 is installed on the inner bottom surface of the profiling grooves 21. The lifting end of the lifting mechanism 4 slides and fits the inner side wall of the profiling grooves 21 and is located at the top of the profiling grooves 21. The inner side wall of the profiling grooves 21 is provided with a plurality of through holes 22. The through holes 22 are filled with graphite. When stamping, the male die 1 pushes the lifting end to abut against the limiting steps. When the punch 1 is stamping and pressing the metal material onto the die 2, the punch 1 will squeeze the lifting mechanism 4, allowing the lifting end of the lifting mechanism 4 to slide into the profiling groove 21 of the die 2 until the lifting end is blocked by the limiting step. At this time, the space between the top surface of the profiling groove 21 and the lifting end is the shape that the tableware needs to form, thereby ensuring that the shape of the tableware can meet the preset standards. During the stamping process of the metal sheet, the side wall of the groove formed by the metal sheet will slide with the side wall of the profiling groove 21. A plurality of through holes 22 are provided on the side wall of the profiling groove 21, and graphite is filled in the through holes 22. A lubricating film is formed between the side wall of the groove formed by stamping of the metal sheet and the side wall of the profiling groove 21 by the graphite, thereby reducing the situation that the tableware cannot be demoulded smoothly after the stamping is completed due to excessive friction between the tableware and the side wall of the profiling groove 21. At the same time, graphite has good thermal conductivity. When the tableware abuts and rubs against the side wall of the profiling groove 21 during the stamping process, the heat generated will be transferred to the die 2 through the graphite, thereby ensuring that the heat generated by the tableware during the stamping process can be dissipated, thereby reducing the situation that the tableware is thermally hardened due to heat accumulation. When the punch 1 retreats after the stamping is completed, the lifting end of the lifting mechanism 4 will slide upward to separate the tableware from the die 2 after the extrusion force is released, so that the tableware can be taken out of the die 2 conveniently, thereby avoiding the situation that the tableware cannot be smoothly removed after the stamping is completed due to excessive friction between the tableware and the profiling groove 21 during the stamping process.

[0037] Since the tableware is stamped twice, the edges, curved parts or small characteristic areas of the tableware will more easily abut against the side walls of the contoured groove 21 during the second stamping, thereby increasing the friction between the tableware and the contoured groove 21. A lubricating film is formed by graphite between the tableware and the contoured groove 21 to reduce the friction, and the tableware is lifted from the die 2 by the lifting mechanism 4, thereby avoiding the situation in which the edges and curved parts of the tableware are unfolded during the second stamping, thereby increasing the friction and making it difficult to remove the tableware.

[0038] In order to ensure that the tableware can be smoothly taken out of the groove after the stamping is completed, and to improve the production efficiency, in the present embodiment, the lifting mechanism 4 includes a lifting plate 41, a lifting spring 42 and a guide column 43, the lifting plate 41 is slidably fitted on the inner side wall of the profiling groove 21, the guide column 43 is installed on the inner bottom surface of the profiling groove 21, the lifting spring 42 is sleeved on the outer side of the guide column 43, and the top surface of the lifting spring 42 abuts against the bottom surface of the lifting plate 41, and when the punch 1 is stamped, the lifting plate 41 is pushed to slide into the profiling groove 21 and abut against the limiting step and compress the lifting spring 42, and when the stamping is completed, when the punch 1 is reset, the compressed lifting spring 42 pushes the lifting plate 41 to move upward, thereby pushing the tableware in the profiling groove 21 to move upward, so that most of the grooves of the tableware can be separated from the area of ​​the profiling groove 21, avoiding the situation that the friction between the tableware and the profiling groove 21 is too large and the tableware is stuck in the profiling groove 21 and is difficult to remove, thereby improving the production efficiency of the tableware.

[0039] In order to ensure that the lifting plate 41 can stably bear the punching pressure applied by the punch 1 when being punched by the punch 1, and to avoid the lifting plate 41 from being deformed after being subjected to external force and affecting the shape structure of the tableware after stamping, thereby improving the stamping quality of the tableware and ensuring the quality of the tableware during the stamping process, in one embodiment, a boss is provided on the bottom surface of the lifting plate 41, and a plurality of reinforcing ribs are provided on the outer wall of the boss, one end of the reinforcing rib is located on the outer wall of the boss, and the other end is located on the outer wall of the top of the lifting plate 41. The design of the boss can increase the bearing area of ​​the lifting plate 41, so that it can better disperse the punching pressure applied by the punch 1, reduce local load concentration, and thus reduce the risk of deformation, and the setting of the reinforcing ribs can effectively increase the rigidity and strength of the lifting plate 41. By fixing one end of the reinforcing rib to the outer wall of the boss and the other end to the outer wall of the top of the lifting plate 41, a stable supporting structure can be formed to reduce deformation when subjected to external force. The boss and reinforcing rib design of the lifting plate 41 can significantly improve its stability and load-bearing capacity during the stamping process, thereby ensuring the stamping quality and consistency of the tableware.

[0040] Since the heat generated during the stamping process is transferred through graphite, the heat generated by the tableware during the stamping process is dissipated to avoid heat accumulation and thermal hardening. Therefore, in order to better dissipate the heat transferred by the graphite and improve the heat dissipation effect, in one embodiment, the outer wall of the die 2 is also provided with a heat dissipation mechanism, which abuts the graphite in the through hole 22. Through the direct contact with the graphite by the heat dissipation mechanism, the heat dissipation mechanism can take away the heat more quickly to prevent the temperature from being too high. At the same time, through effective heat dissipation, heat accumulation can be avoided and thermal hardening of materials caused by high temperature can be reduced.

[0041] Since the heat generated during the stamping process of the tableware is relatively low, heat accumulation can be avoided as long as this part of the heat can be quickly dissipated. At the same time, in order to reduce production costs, in one embodiment, the heat dissipation mechanism includes a heat conducting plate 51 and heat dissipation fins 52. One end of the heat conducting plate 51 is installed on the outer wall of the die 2 and abuts against the graphite in the through hole 22. The heat dissipation fins 52 are installed on the other end of the heat conducting plate 51. The heat transferred by the graphite in the through hole 22 is discharged through the heat conducting plate 51, and the contact area with the outside air is increased through the heat dissipation fins 52 to promote heat dissipation. It can ensure that the heat generated during the stamping process is taken away in time to avoid heat accumulation inside the equipment, thereby reducing the risk of thermal hardening. Through the combination of the heat conducting plate 51 and the heat dissipation fins 52, the material cost and complexity can be reduced while ensuring the heat dissipation effect.

[0042] Since the die 2 needs to bear the impact force of the punch 1 during use, the probability of damage is greater than the probability of damage to the punch 1, and the position of the die 2 that is subjected to stamping is located in the profiling groove 21, and the graphite material filled on the die 2 needs to be supplemented to a certain extent after long-term use. In order to facilitate the maintenance of the die 2, improve the adaptability of the die 2, and reduce the production cost of tableware of different specifications, in one embodiment, the mold frame 3 is composed of a base 31 and a limit frame 32, and the limit frame 32 is detachably installed on the top surface of the base 31, and the through hole 22 The limiting step is provided on the limiting frame 32 and is provided on the top surface of the base 31. By dividing the film frame into two parts, the limiting frame 32 is damaged during stamping. At this time, it is only necessary to remove and replace the limiting frame 32 from the base 31 for the next stamping, thereby improving the production efficiency of the tableware. At the same time, when tableware of different specifications is produced, the limiting frame 32 can also be replaced and the corresponding male mold 1 can be replaced accordingly, thereby improving the adaptability of the female mold 2 to different specifications and reducing the production cost required for tableware of different specifications.

[0043] In order to ensure that the tableware can be shaped during the second stamping, in one embodiment, a pressure sensor is provided on the bottom surface of the punch 1, and the pressure sensor is used to detect the stamping force applied by the punch 1 to the die 2 during stamping. The stamping force applied by the punch 1 during the stamping process is sensed by the pressure sensor. When the shape of the tableware rebounds to a certain extent during the first stamping, the pressure sensor can be used to determine the stamping force during the first stamping process. In this way, the second stamping force can be adjusted based on the first stamping force during the second stamping, thereby ensuring that the tableware can be shaped.

[0044] In order to ensure that the lifting mechanism 4 can smoothly lift the tableware and complete the unloading process of the tableware, in one embodiment, the guide column 43 is composed of an electromagnet, and the guide column 43 is energized to generate magnetic force to repel the lifting plate 41. Since the compression force released by the lifting spring 42 will be affected by the weight and friction of the tableware itself, it cannot be ensured that the lifting spring 42 can accurately lift the tableware. Therefore, by adjusting the power-on time and strength of the electromagnet, the lifting process can be accurately controlled, which reduces mechanical wear, simplifies the structural design, and improves safety and production efficiency.

[0045] Since a secondary stamping is required to ensure that the tableware will not be affected by uneven rebound, the dimensional accuracy of the tableware will not be affected. Therefore, in order to ensure that the shaping of the tableware can be completed during the secondary stamping, in one embodiment, a laser rangefinder is embedded in the side wall of the profiling groove 21 and the tableware completed by the first stamping is detected. The guide column 43 adjusts the power-on current according to the detection value of the laser rangefinder. The laser rangefinder is embedded in the side wall of the profiling groove 21 to detect whether the shape of the tableware reaches the preset standard value after the first stamping. If deformation occurs, the guide column 43 will be in a powered-on state during the second stamping process. In this way, during the second stamping, it can be ensured that the lifting plate 41 can withstand a greater stamping force, thereby avoiding deformation of the lifting plate 41 when subjected to a greater stamping force and affecting the shaping of the tableware, ensuring the dimensional accuracy of the tableware after stamping, optimizing the production process, reducing costs, and improving product quality.

[0046] Embodiment 2: Due to the differences in the types of tableware, different tableware needs to be matched with different concave molds 2 and convex molds 1. Figure 4 The present invention also provides a method for stamping another type of tableware, and this type of tableware only needs to replace the corresponding die 2, punch 1 and the shape of the lifting plate 41 in the lifting mechanism 4 to stamp different types of tableware. In this way, the stamping method of the present invention can be used to stamp different types of tableware, thereby improving the adaptability range of tableware stamping and effectively reducing the investment in production costs.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for stamping hardware tableware, characterized in that: The following steps are involved: S1: Prepare materials, cut the tableware production materials into standard plates to be stamped; S2: Loading, loading the prepared material onto the die; S3: stamping, starting the punch to stamp, pressing the sheet onto the die through the punch to obtain a stainless steel tableware blank; S4: Shaping, re-pressing and shaping the stainless steel tableware blank to fix the shape of the stainless steel tableware; S5: Cutting, taking the tableware out of the die to complete stamping and proceed to the subsequent process; The die comprises a die frame and a lifting mechanism, wherein a plurality of profiling grooves corresponding to the punches are provided on the top surface of the die frame, and limiting steps are provided on the side walls of the bottom of the profiling grooves. The lifting mechanism is installed on the inner bottom surface of the profiling grooves, and a lifting end of the lifting mechanism slides in contact with the inner side wall of the profiling grooves and is located at the top of the profiling grooves. A plurality of through holes are provided on the inner side wall of the profiling grooves, and graphite is filled in the through holes. When stamping, the punches push the lifting end to contact the limiting steps.

2. A method for punching hardware tableware according to claim 1, characterized in that: The lifting mechanism includes a lifting plate, a lifting spring and a guide column. The lifting plate is slidably fitted on the inner side wall of the profiling groove, the guide column is installed on the inner bottom surface of the profiling groove, the lifting spring is sleeved on the outer side of the guide column, and the top surface of the lifting spring abuts against the bottom surface of the lifting plate. When the punch is stamped, it pushes the lifting plate to slide into the profiling groove and abut against the limit step and compress the lifting spring.

3. A method for punching hardware tableware according to claim 1, characterized in that: A boss is provided on the bottom surface of the lifting plate, and a plurality of reinforcing ribs are provided on the outer side wall of the boss, one end of the reinforcing ribs is located on the outer side wall of the boss, and the other end is located on the outer side wall of the top of the lifting plate.

4. A method for punching hardware tableware according to claim 1, characterized in that: The outer side wall of the concave mold is also provided with a heat dissipation mechanism, and the heat dissipation mechanism abuts against the graphite in the through hole.

5. A method for punching hardware tableware according to claim 4, characterized in that: The heat dissipation mechanism comprises a heat conducting plate and heat dissipation fins. One end of the heat conducting plate is mounted on the outer side wall of the concave mold and abuts against the graphite in the through hole. The heat dissipation fins are mounted on the other end of the heat conducting plate.

6. A method for punching hardware tableware according to claim 1, characterized in that: The mold frame is composed of a base and a limiting frame, the limiting frame is detachably mounted on the top surface of the base, the through hole is arranged on the limiting frame, and the limiting step is arranged on the top surface of the base.

7. The punching method of hardware tableware according to claim 1, characterized in that: A pressure sensor is provided on the bottom surface of the punch, and the pressure sensor is used to detect the punching force applied by the punch to the die when the punch is punching.

8. The punching method of hardware tableware according to claim 2, characterized in that: The guide column is composed of an electromagnet, and when the guide column is energized, a magnetic force is generated to repel the lifting plate.

9. A method for punching hardware tableware according to claim 8, characterized in that: The punch also includes a laser rangefinder, which is embedded in the side wall of the profiling groove and detects the tableware completed by the first punching. The guide column adjusts the current according to the detection value of the laser rangefinder.

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