Composite fine blanking die for a hole cylinder part and machining method thereof

Abstract

The application discloses a composite fine punching die for a hole cylinder part and a processing method thereof. The composite fine punching die for the hole cylinder part comprises an upper die and a lower die. The upper die comprises an upper die plate, an upper cushion plate, an upper fixed plate and a concave die plate. The lower die comprises a lower ejection plate, a lower fixed plate, a lower cushion plate and a lower die plate. The male and female dies are fixed on the lower fixed plate and are in sliding fit with the ejection plate. The ejector is installed in the central hole of the male and female dies and is in sliding fit with the male and female dies. The bottom of the punching male die is fixedly connected with the male and female dies. The top of the punching male die is inserted into the through hole of the ejector and is in sliding fit with the ejector. The ejector rod passes through the male and female dies, the lower cushion plate and the lower die plate in sequence and the top end of the ejector rod abuts against the bottom end surface of the ejector. The stretching male die is fixed on the upper fixed plate. A punch rod is arranged on the internal through hole of the stretching male die. The push plate is sleeved on the outside of the stretching male die. The concave die insert is sleeved on the outside of the push plate. The composite fine punching die for the hole cylinder part can improve the stamping product quality and production efficiency.

Description

Technical Field

[0001] This invention relates to the field of fine blanking die structure technology, and in particular to a composite fine blanking die for cylindrical parts with holes and its processing method. Background Technology

[0002] Cylindrical stretching parts ( Figure 1 (The text abruptly shifts to a different topic) This is a common type of part in daily life, widely used in various fields, including electrical appliances, automotive parts, and medical devices. It mentions that sheet metal is deformed into cylindrical or box-shaped parts using common stamping, drawing rings, or metal dies. Fine blanking and drawing processes are characterized by high efficiency, low consumption, and high quality, producing parts with small dimensional tolerances, high geometrical accuracy, smooth outer diameters, and good perpendicularity and interchangeability. In fine blanking, a special die structure is used to produce these parts, allowing blanking, drawing, and punching to be completed in a single step. Its advantages and disadvantages compared to commonly used similar parts production processes are shown below:

[0003] (1). Using three sets of single-operation molds for processing, first blanking, then stretching, and finally punching: the process is simple, but the processing efficiency is extremely low and the process is complex, making it unsuitable for mass production.

[0004] (2). Multi-step processing using progressive dies: Progressive dies can process complex parts and can perform multiple stretching operations to ensure that the parts do not wrinkle or tear. However, the die results are complex and the accuracy is not stable. Summary of the Invention

[0005] The main objective of this invention is to provide a composite fine stamping die for perforated cylindrical parts and its processing method, which aims to form perforated cylindrical parts using only one die, thereby effectively improving production efficiency.

[0006] To achieve the above objectives, the present invention provides a composite fine blanking die for a cylindrical part with holes, comprising an upper die and a lower die. The upper die includes an upper template, an upper backing plate, an upper fixing plate, and a concave template arranged sequentially from top to bottom. The lower die includes a stripper plate, a lower fixing plate, a lower backing plate, and a lower template arranged sequentially from top to bottom. The punch and die are fixed on the lower fixing plate and slide with the stripper plate. The ejector is installed in the center hole of the punch and die and slides with it. The bottom of the punch is fixedly connected to the punch and die, and the top of the punch is inserted into the through hole of the ejector and slides with it. The ejector rod passes through the punch and die, the lower backing plate, and the lower template in sequence, and its top end abuts against the bottom end face of the ejector.

[0007] The stretching punch is fixed on the upper fixed plate. A punch rod is inserted through the internal through hole of the stretching punch. The push plate is sleeved on the outside of the stretching punch and slides with the die plate. The die insert is sleeved on the outside of the push plate and fixed on the die plate. The die insert slides with the push plate.

[0008] Preferably, the composite fine blanking die for the perforated cylindrical part further includes a floating guide pin passing through the upper fixed plate and the concave plate.

[0009] Preferably, the floating guide pin is connected to a spring for resetting.

[0010] Preferably, both the punch and die and the drawing punch are made of cold work die steel.

[0011] Preferably, the unloading plate is connected to a hydraulic cylinder push rod to provide a pressing and unloading force, and the hydraulic pressure connected to the hydraulic cylinder push rod is adjustable to adjust the pressing force.

[0012] Preferably, the punch and die are arranged opposite to the push plate to punch the part, the drawing punch is arranged opposite to the ejector to draw the part, and the punching punch is arranged opposite to the punching rod to punch the part.

[0013] Preferably, the punch and die have a central hole and an ejector pin hole communicating with the central hole. The central hole is a blind hole, the ejector is accommodated in the central hole of the punch and die, and the ejector pin passes through the ejector pin hole.

[0014] Preferably, the punch and die are fixed to the lower fixed plate by a mounting platform, the punching punch is fixed to the punch and die by a mounting platform, and the drawing punch is fixed to the upper fixed plate by a mounting platform.

[0015] The present invention further proposes a processing method based on the above-mentioned composite fine blanking die for perforated cylindrical parts, comprising the following steps:

[0016] The strip is placed between the upper and lower dies, and the strip is pressed onto the punch and die by the blank holder force. The punch and die cooperate with the push plate and the die insert to plastically deform the strip along the cutting edge shape of the punch and die to punch the part.

[0017] After blanking is completed, the punched part is formed into the punch and die under the blanking force of the drawing punch and the drawing process is carried out. During the drawing process, the part and the ejector move downward together. After being locked at the bottom of the punch and die hole, the drawing is completed. When the drawing is about to be completed, the ejector continues to move downward. The punching punch is exposed after being guided by the ejector and punching. At this time, the drawing punch is the die. Under the action of blanking force and counter pressure, the part completes the punching process.

[0018] The cylindrical part formed after punching is removed, and the inner circle and opening end face of the cylindrical part are machined by CNC lathe.

[0019] Preferably, the cylindrical part formed after punching is removed using the following method:

[0020] After the blanking is completed, the pressure plate force and the counter pressure release control the mold to open, the blank holder force lifts the stripper plate, the punch and die slide with the stripper plate, at this time the punch and die return to their original position, the strip is unloaded from the punch and die, and the floating guide pin carries the strip away from the die surface by the spring force;

[0021] During the mold opening process, the push plate removes the part, and the back pressure pushes the ejector through the ejector pin, which in turn pushes the part out. Compressed air is used to blow away the part and scrap. After the mold opens, the ejection force pushes out the punching scrap through the punching pin inside the stretching punch.

[0022] The composite fine blanking die for perforated cylindrical parts proposed in this invention has the following beneficial effects:

[0023] 1. This composite precision blanking die can form a perforated cylindrical part in one composite blanking process. The blanking, stretching and punching are carried out sequentially in the entire stamping process, which can greatly improve production efficiency. At the same time, the parts stamped by this composite process have good consistency, low cost and high dimensional accuracy, which is conducive to mass production.

[0024] 2. A new punch and die are adopted. The punch is used during blanking and the die is used during drawing. The new drawing punch is used during drawing and the die is used during punching. Its structure is ingenious.

[0025] 3. This composite fine stamping die has the advantages of simple structure, stable and reliable operation, and easy implementation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a cylindrical part with a hole;

[0027] Figure 2 This is a schematic diagram of a preferred embodiment of the composite fine stamping die for perforated cylindrical parts according to the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the composite fine stamping die for perforated cylindrical parts of the present invention during composite stamping forming;

[0029] Figure 4 This is a schematic diagram of the composite fine stamping die for perforated cylindrical parts of the present invention in the composite stamping forming strip.

[0030] In the figure, 1. concave template, 2. upper fixed plate, 3. concave die insert, 4. push plate, 5. stretching punch, 6. punching rod, 7. lower fixed plate, 8. punch and die, 9. punching punch, 10. ejector, 11. ejector pin, 12. stripper plate, 13. floating guide pin.

[0031] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0033] It should be noted that in the description of this invention, the terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] This invention proposes a composite fine blanking die for perforated cylindrical parts.

[0035] Reference Figure 2 In this preferred embodiment, a composite fine blanking die for a perforated cylindrical part includes an upper die and a lower die. The upper die includes an upper template, an upper backing plate, an upper fixing plate 2, and a concave template 1 arranged sequentially from top to bottom. The lower die includes a stripper plate 12, a lower fixing plate 7, a lower backing plate, and a lower template arranged sequentially from top to bottom.

[0036] The punch and die 8 are fixed on the lower fixed plate 7 and slide with the stripper plate 12. The ejector 10 is installed in the center hole of the punch and die 8 and slides with it. The bottom of the punch 9 is fixedly connected to the punch and die 8. The top of the punch 9 is inserted into the through hole of the ejector 10 and slides with it. The ejector rod 11 passes through the punch and die 8, the lower pad plate and the lower template in sequence, and its top end abuts against the bottom end face of the ejector 10 to push the ejector 10 to move.

[0037] The stretching punch 5 is fixed on the upper fixed plate 2. A punching rod 6 is provided through the internal through hole of the stretching punch 5. The push plate 4 is sleeved on the outside of the stretching punch 5 and slides with the die plate 1. The die insert 3 is sleeved on the outside of the push plate 4 and fixed on the die plate 1. The die insert 3 slides with the push plate 4.

[0038] The punch and die 8 are guided by sliding fit with the stripper plate 12. It is a punch during blanking and a die during drawing. The drawing punch 5 is a punch during drawing and a die during punching.

[0039] Reference Figure 1This embodiment uses a perforated cylindrical part as an example. The material is 316 stainless steel. Due to the addition of molybdenum (Mo), the corrosion resistance and high-temperature strength of this stainless steel are significantly improved. It can withstand temperatures up to 1200-1300 degrees Celsius, allowing it to be used under harsh conditions. It possesses excellent corrosion resistance and oxidation resistance. Technical standard: GB / T 20878-2007. This stainless steel features high strength and high toughness, and the inner and outer surfaces are functional areas, requiring a bright, wrinkle-free finish (see specific dimensional requirements). Figure 1 ).

[0040] Furthermore, the composite fine blanking die for the perforated cylindrical part also includes a floating guide pin 13 passing through the upper fixed plate 2 and the concave plate 1. The floating guide pin 13 is connected to a spring for resetting.

[0041] The floating guide pin 13 serves two purposes: guiding the material strip and allowing it to detach from the die surface, ensuring smooth feeding and facilitating the removal of waste from the die surface. Therefore, installing the floating guide pin 13 ensures stable stamped product quality, high production efficiency, and is beneficial for mass production.

[0042] In this embodiment, both the punch and die 8 and the drawing punch 5 are made of cold work die steel (such as cold work die steel CALDIE). Rough machining is performed on a lathe before heat treatment. After heat treatment, quenching and high-temperature tempering are performed to achieve a hardness of 60-62 HRC. After the material heat treatment is completed, the outer shape and inner hole are precision ground using a grinding machine and then polished.

[0043] Furthermore, the unloading plate 12 is connected to a hydraulic cylinder push rod 11 to provide a pressing and unloading force, and the hydraulic pressure connected to the hydraulic cylinder push rod 11 is adjustable to adjust the pressing force.

[0044] The blanking die blanking force is provided by the hydraulic cylinder push rod 11. The blanking force can be adjusted by adjusting the hydraulic pressure of the blanking machine, so as to ensure that the parts do not wrinkle or crack during the stretching process.

[0045] In this embodiment, the punch and die 8 are arranged opposite to the push plate 4 to punch the part, the stretching punch 5 is arranged opposite to the ejector 10 to stretch the part, and the punching punch 9 is arranged opposite to the punching rod 6 to punch the part.

[0046] In this embodiment, the punch and die 8 are provided with a central hole and an ejector pin hole communicating with the central hole. The central hole is a blind hole. The ejector 10 is accommodated in the central hole of the punch and die 8 and can move up and down relative to it. The ejector pin 11 passes through the ejector pin hole.

[0047] In this embodiment, the punch and die 8 are fixed to the lower fixed plate 7 by a mounting platform (the mounting platform has an annular protrusion on its outer ring side, and the lower fixed plate has an annular groove to accommodate the protrusion, thereby fixing the two together). The punching punch 9 is fixed to the punch and die 8 by the mounting platform, and the drawing punch 5 is fixed to the upper fixed plate 2 by the mounting platform. Of course, the punch and die 8, the punching punch 9, and the drawing punch 5 can also be fixed in other ways, as long as they can be fixed. This invention does not limit this.

[0048] Reference Figures 2 to 4 The stamping process of this composite fine stamping die for perforated cylindrical parts is as follows:

[0049] Before blanking begins, the strip is pressed against the die insert 3 of the punch and die by the blank holder 12 outside the shearing line using the blank holder force. At the same time, the counterforce is pressed against the punch and die 8 by the push plate 4 inside the shearing line. In this pressed state, blanking is performed under the action of the blanking force. The metal in the shearing zone is under triaxial compressive stress, which suppresses the movement of the inner and outer metal sheets during blanking. At this time, the strip blanks the part in the form of plastic deformation along the shape of the die cutting edge.

[0050] After blanking is completed, the punched part is formed into the die 8 under the blanking force of the drawing punch 5, and the drawing process is performed. During drawing, the part and the ejector 10 move downward together. After being locked at the bottom of the countersunk hole in the die 8, the drawing is completed. When the drawing is about to be completed, punching is performed. At this time, the ejector 10 continues to move downward, and the punching punch 9 is exposed after being guided by the ejector 10. At this time, the drawing punch 5 is the die. Under the action of blanking force and counterforce, the part completes the punching process. Figure 3 The diagram shown is a schematic diagram of the entire die stamping process. At this point, blanking, stretching, and punching are all completed, and the die is locked in place by the ejector 10 and the punch and die 8.

[0051] After blanking is completed, the pressure plate force and counter-pressure are released, the mold opens, the blank holder force lifts the stripper plate 12, the punch and die 8 slide with the stripper plate 12, at this time the punch and die 8 return to their original position, the strip is ejected from the punch and die 8, and the floating guide pin 13 carries the strip away from the mold surface by spring force. After the mold opens, the ejection force ejects the punching waste through the punch rod 6 in the stretching punch 5; during the mold opening process, the push plate 4 ejects the part, while the counter-pressure pushes the ejector 10 through the ejector rod 11, the ejector 10 pushes the part, ejects the part, and uses compressed air to blow away the part and waste.

[0052] The composite fine blanking die for perforated cylindrical parts proposed in this invention has the following beneficial effects:

[0053] 1. This composite precision blanking die can form a perforated cylindrical part in one composite blanking process. The blanking, stretching and punching are carried out sequentially in the entire stamping process, which can greatly improve production efficiency. At the same time, the parts stamped by this composite process have good consistency, low cost and high dimensional accuracy, which is conducive to mass production.

[0054] 2. The new punch and die 8 is used. It is a punch during blanking and a die during drawing. The new drawing punch 5 is a punch during drawing and a die during punching. Its structure is ingenious.

[0055] 3. This composite fine stamping die has the advantages of simple structure, stable and reliable operation, and easy implementation.

[0056] The present invention further proposes a processing method for a composite fine blanking die for a cylindrical part with a hole.

[0057] In this preferred embodiment, a processing method based on the above-described composite fine blanking die for a perforated cylindrical part includes the following steps:

[0058] Step S10: Place the strip between the upper and lower dies, press the strip onto the punch and die 8 by the blank holder force, and make the strip plastically deform along the cutting edge shape of the punch and die 8 by the cooperation of the punch and die 8 with the push plate 4 and the die insert 3 to punch the part.

[0059] Step S20: After blanking is completed, the punched part is formed into the die 8 under the blanking force of the drawing punch 5 and the drawing process is carried out. During the drawing process, the part moves down together with the ejector 10. After being locked at the bottom of the countersunk hole of the die 8, the drawing is completed. When the drawing is about to be completed, the ejector 10 continues to move down. The punching punch 9 is exposed after being guided by the ejector 10 and punching is performed. At this time, the drawing punch 5 is the die. Under the action of blanking force and counter pressure, the part completes the punching process.

[0060] Step S30: Take out the cylindrical part formed after punching, and machine the inner circle and the end face of the opening of the cylindrical part by CNC lathe.

[0061] When machining with a CNC lathe, the part is clamped once, and a dedicated program is run to complete the machining of the end face and inner circle in one go. At the same time, burrs caused by fine blanking are removed, resulting in high machining efficiency. This part uses a combined fine blanking + CNC lathe machining process, which has high manufacturing efficiency, low cost, stable quality, and is suitable for mass production.

[0062] Specifically, the following method is used to remove the cylindrical part formed after punching:

[0063] After the blanking is completed, the pressure plate force and the counter pressure release control the mold to open. The blank holder force lifts the stripper plate 12, and the punch and die 8 slides with the stripper plate 12. At this time, the punch and die 8 returns to its original position, and the strip is unloaded from the punch and die 8. The floating guide pin 13 uses spring force to carry the strip away from the die surface.

[0064] During the mold opening process, the push plate 4 unloads the part, and the back pressure pushes the ejector 10 through the ejector pin 11. The ejector 10 pushes the part and ejects it. Compressed air is used to blow away the part and the waste. After the mold opens, the ejection force pushes out the punching waste through the punching rod 6 in the stretching punch 5.

[0065] The processing method proposed in this invention has the following beneficial effects:

[0066] 1. The process uses fine blanking technology, which can form the part in one composite blanking. The entire stamping process is completed in one go by blanking, stretching and punching. The parts stamped by this composite process have good consistency and high dimensional accuracy, which is conducive to mass production.

[0067] 2. Cylindrical parts can be directly stamped from rolled material, greatly improving production efficiency;

[0068] 3. After fine blanking, CNC lathe is used for machining, turning the dome, inner circle and expanding the hole. The machining can be completed in one clamping, which improves the machining efficiency.

[0069] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A processing method for a compound fine blanking die for a hole cylinder part, the compound fine blanking die comprising an upper die and a lower die, characterized by, The upper die comprises an upper die plate, an upper backing plate, an upper fixed plate and a concave die plate arranged in sequence from top to bottom, and the lower die comprises a stripper plate, a lower fixed plate, a lower backing plate and a lower die plate arranged in sequence from top to bottom, wherein the punch and the die are fixed on the lower fixed plate and are in sliding fit with the stripper plate, the ejector is installed in the central hole of the punch and die and is in sliding fit with the punch and die, the bottom of the piercing punch is fixedly connected with the punch and die, the top of the piercing punch is inserted into the through hole of the ejector and is in sliding fit with the ejector, the ejector rod passes through the punch and die, the lower backing plate and the lower die plate in sequence and the top end of the ejector rod abuts against the bottom end surface of the ejector, and the floating guide pin is arranged on the upper fixed plate and the concave die plate. The stretch punch is fixed on the upper fixed plate, a punch rod is arranged in the through hole of the stretch punch, the push plate is sleeved on the outside of the stretch punch and is in sliding fit with the concave die plate, the die insert is sleeved on the outside of the push plate and is fixed on the concave die plate, and the die insert is in sliding fit with the push plate; the punch and die and the stretch punch are both made of cold work die steel; the floating guide pin is connected with a spring for resetting; the stripper plate is connected with the hydraulic cylinder ejector rod for providing the blank holding force, the hydraulic pressure of the hydraulic cylinder ejector rod can be adjusted to adjust the blank holding force; the punch and die are oppositely arranged with the push plate to punch the part, the stretch punch is oppositely arranged with the ejector to stretch the part, and the piercing punch is oppositely arranged with the punch rod to punch the part. The processing method of the composite fine blanking die for the hole cylinder part comprises the following steps: The material belt is placed between the upper die and the lower die, the material belt is pressed on the punch and die by the blank holding force, the material plate is plastically deformed along the edge shape of the punch and die by the cooperation of the punch and die, the push plate and the die insert, so as to punch the part; After the blanking is completed, the punched part is formed into the punch and die under the punching force of the stretch punch, the stretching process is carried out, the part moves downward together with the ejector during the stretching, and the stretching is completed after the part hits the bottom of the punch and die sink hole, when the stretching is about to be completed, the ejector continues to move downward, the piercing punch is exposed after being guided by the ejector, at this time, the stretch punch is the die, and the part completes the punching process under the punching force and the counter pressure; The cylinder part formed after the punching is taken out, and the inner circle and the end face of the cylinder part are processed by the numerical control lathe.

2. The machining method of a compound fine blanking die for a hole-featured cylindrical part according to claim 1, characterized by, The punch and die are provided with a central hole and a ejector rod hole communicated with the central hole, the central hole is a blind hole, the ejector is accommodated in the central hole of the punch and die, and the ejector rod is arranged in the ejector rod hole.

3. The machining method of a compound fine blanking die for a hole-featured cylindrical part according to claim 1 or 2, characterized in that, The punch and die are fixed on the lower fixed plate through the hanging table, the piercing punch is fixed on the punch and die through the hanging table, and the stretch punch is fixed on the upper fixed plate through the hanging table.

4. The machining method of a compound fine blanking die for a hole-featured cylindrical part according to Claim 1, characterized by, The following method is adopted to take out the cylinder part formed after the punching: After the punching is completed, the blank holding force and the counter pressure are released to control the opening of the die, the blank holding force lifts the stripper plate, the punch and die are in sliding fit with the stripper plate, at this time, the punch and die reset, the material belt is unloaded from the punch and die, and the floating guide pin takes the material belt away from the die surface through the spring force; During the opening of the die, the push plate unloads the part, the counter pressure pushes the ejector through the ejector rod, the ejector pushes the part, the part is pushed out, and the part and the waste are blown away by compressed air, after the die is opened, the stripping force pushes out the punched waste through the punch rod in the stretch punch.

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