Precise three-dimensional stamping mode for producing insulation shielding cover of high-speed optical module

Abstract

The invention discloses a precise three-dimensional stamping mode for producing a high-speed optical module insulation shielding case. According to the technical scheme, the method comprises the following steps that a, a guide hole is punched in advance, wherein the guide hole is punched in a material belt through a punching punch; b, pre-punching the appearance, namely pre-punching the appearance of the part to be formed on the material belt by taking the guide hole as a reference, and only reserving a plurality of belt material points; c, drawing forming is conducted, specifically, the shape except the part needing to be punched is drawn through cooperation of a drawing male die and a female die, the depth of a drawn blank is larger than the maximum height of the shielding case, and the size of the female die is slightly larger than the size of the shape of the shielding case; d, three-dimensional side blanking is conducted, specifically, a telescopic male die mechanism extends into the shielding cover, a punching machine runs to the bottom dead center, a driving block drives a male die sliding block with a knife edge to run towards the outer side, the running distance is larger than the thickness of the shielding cover, and then full-circumferential side cutting is completed; and e, discharging a finished product after demolding. According to the scheme, the end face is free of overcut and high in flatness.

Description

Technical Field

[0001] The invention relates to the technical field of optical module shielding cover production and manufacturing, and in particular to a precise three-dimensional stamping method for producing an insulating shielding cover of a high-speed optical module. Background Art

[0002] The optical module shielding cover is a device set on the optical module PCB board to protect the optical chip in the optical module. Its specific function is to provide a stable working environment for the optical chip, free from internal and external electromagnetic wave interference, and play a role in shielding electromagnetic signal interference and preventing fine dust and tiny foreign objects from invading. The structure of the optical module shielding cover is usually a cover with positioning feet, which needs to be sealed and connected to the PCB through the end face. If the end face is overcut or uneven, there will be gaps between the optical module shielding cover and the PCB board. Electromagnetic interference may penetrate through these gaps, causing signal instability or even failure. Especially for high-speed optical modules, such as 400G and above models, the requirements for electromagnetic shielding performance are more stringent.

[0003] The production process of high-speed optical modules in the prior art is relatively traditional, and the optical module shielding cover is mainly made by punching + bending / drawing process. In this traditional two-dimensional stamping process, punching and forming are often limited to a single or two dimensions, which will inevitably lead to the problem of end face overcutting, and the flatness of the end face is ±0.10mm, and the end face flatness is low, which makes it difficult to meet the technical requirements of the high-speed optical module shielding cover. Summary of the invention

[0004] In view of the shortcomings of the prior art, the main purpose of the present invention is to provide a precise three-dimensional stamping method for producing an insulating shielding cover for a high-speed optical module with no overcutting of the end surface and high end surface flatness.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a precision three-dimensional stamping method for producing an insulating shielding cover of a high-speed optical module, comprising a retractable punch mechanism arranged in a sleeve, the retractable punch mechanism comprising a driving block moving along the Z-axis direction, the driving block connecting a plurality of punch sliders through a ratchet hook structure, when the driving block moves up and down along the Z-axis direction, the driving block drives a plurality of punch sliders to retract along the X-axis or Y-axis direction through the ratchet hook structure, when the punch press is turned on, each punch slider retracts, at which time the retractable punch mechanism can extend into the shielding cover, when the punch press runs to the bottom dead point, the punch slider with a knife edge extends out driven by the driving block, the precision three-dimensional stamping method comprises the following steps: a. Pre-punching guide holes: Punch guide holes on the material strip using a punch; b. Pre-punching the shape: Taking the guide hole as the reference, pre-punch the shape of the part to be formed on the material strip, leaving only a few material points; c. Deep drawing: The outer shape of the part except the part to be blanked is drawn out through the cooperation of the drawing punch and the drawing die. The depth of the drawn blank should be greater than the highest height of the shielding cover, and the size of the drawing die is slightly larger than the outer size of the shielding cover. d. Three-dimensional side punching: The drawn shielding cover is placed in the punching die, and the retractable punch mechanism, i.e., the punching punch, extends into the drawn shielding cover. A side cutting edge is arranged on the outer side of the punch slider. When the punch press runs to the bottom dead center, the driving block drives the punch slider to run outward. The shape of the side cutting edges on each side of the retractable punch mechanism and the cutting edge shape of each side of the punching die are respectively the same as the shape of each side of the corresponding formed shielding cover. The running distance of the punch slider is greater than the thickness of the shielding cover, i.e., the full-circle side cutting is completed. e. The finished product is discharged after demoulding.

[0006] Preferably, the shape of the driving block is larger at the top and smaller at the bottom, and the ratchet hook structure includes a ratchet hook arranged on the driving block and a hook-shaped groove arranged on the punch slider and cooperating with the ratchet hook, and the shape of the ratchet hook is a ratchet gear shaped and arranged upwardly inclined.

[0007] Preferably, in step c, the depth of the drawn blank is at least 1.0 mm greater than the highest height of the shielding cover.

[0008] Preferably, in step c, the material of the drawing punch and the drawing die is tungsten steel material containing graphite.

[0009] Preferably, when the punch sliders of the retractable punch mechanism are retracted, the size of the punch formed by the punch sliders is 0.1-0.3 mm smaller than the size of the shielding cover.

[0010] Preferably, in step d, the size of the punching die is based on the size of the shielding cover plus 0.05 mm on each side.

[0011] Preferably, in step d, when the punch press runs to the bottom dead center, the running distance of the punch slider with the side cutting edge is the thickness of the shielding cover plus 0.5 mm.

[0012] Preferably, in step d, the blanking gap between the punch and the die is 4% of the thickness of the shielding cover.

[0013] Compared with the prior art, the present invention has the following advantages: it realizes three-dimensional stamping forming based on a retractable punch mechanism, and the retractable punch mechanism can realize precise control of stamping in three directions of XYZ axis, so as to obtain efficient and low-cost end face stamping products without overcutting. The retractable punch structure is used in a multi-station continuous die when producing high-speed optical module insulation shielding covers. The maximum precision of the stamped parts can reach ±0.01mm, and the end face flatness can be stabilized at ±0.03mm, which fully meets the technical requirements of high-speed optical module insulation shielding covers. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A top view of the insulating shielding cover of the high-speed optical module of the present invention; Figure 2 It is a side view of the insulating shielding cover of the high-speed optical module of the present invention; Figure 3 It is a structural schematic diagram of the material strip of the present invention; Figure 4 It is a planar structural principle diagram of each punch slider of the retractable punch mechanism of the present invention; Figure 5 It is a schematic diagram of the operating structure of the retractable punch mechanism of the present invention.

[0015] In the figure: 1. Shielding cover; 2. Positioning foot; 3. Material strip; 4. Guide hole; 5. Pre-punched shape; 6. Driving block; 7. Punch slider; 8. Blanking die; 9. Side cutting edge; 10. Rachele hook; 11. Hook groove; 12. Blanking gap; A. Before three-dimensional blanking; B. After three-dimensional blanking. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] like Figure 1 As shown, a precision three-dimensional stamping method for producing an insulating shielding cover 1 of a high-speed optical module includes a retractable punch mechanism arranged in a sleeve, the retractable punch mechanism includes a driving block 6 moving along the Z-axis direction, the driving block 6 is connected to a plurality of punch sliders 7 through a ratchet hook 10 structure, when the driving block 6 moves up and down along the Z-axis direction, the driving block 6 drives a plurality of punch sliders 7 to retract along the X-axis or Y-axis direction through the ratchet hook 10 structure, when the punch press is turned on, each punch slider 7 retracts, at which time the retractable punch mechanism can extend into the shielding cover 1, when the punch press runs to the bottom dead point, the punch slider 7 with a knife edge extends out driven by the driving block 6, the precision three-dimensional stamping method includes the following steps: a. Pre-punching guide holes 4: punching guide holes 4 on the material strip 3 by using a punching punch; b. Pre-punching the shape: Taking the guide hole 4 as the reference, pre-punch the shape of the part to be formed on the material strip 3, leaving only a few material points; c. Deep drawing: The outer shape of the part except the part to be blanked is drawn out by the cooperation of the drawing punch and the drawing die. The depth of the drawn blank is greater than the highest height of the shielding cover 1, and the size of the drawing die is slightly larger than the outer size of the shielding cover 1; d. Three-dimensional side blanking: The drawn shielding cover 1 is placed in the blanking die 8, and the retractable punch mechanism, i.e., the blanking punch, extends into the drawn shielding cover 1. A side cutting edge 9 is arranged on the outer side of the punch slider 7. When the punch press runs to the bottom dead center, the driving block 6 drives the punch slider 7 to run outward. The shape of the side cutting edges 9 on each side of the retractable punch mechanism and the cutting edge shape of each side of the blanking die 8 are respectively the same as the outer shape of each side of the corresponding formed shielding cover 1. The running distance of the punch slider 7 is greater than the thickness of the shielding cover 1, i.e., the full-circle side cutting is completed; e. The finished product is discharged after demoulding.

[0018] The present invention provides a precise three-dimensional stamping method for producing the insulating shielding cover 1 of a high-speed optical module. The three-dimensional stamping is realized based on a retractable punch mechanism. The retractable punch mechanism can realize precise control of stamping in three directions of XYZ axis, and obtain efficient and low-cost stamping products without overcutting on the end face. The retractable punch structure is used in a multi-station continuous die when producing the insulating shielding cover 1 of the high-speed optical module. The maximum precision of the stamped parts can reach ±0.01mm, and the flatness of the end face can be stabilized at ±0.03mm, which fully meets the technical requirements of the insulating shielding cover 1 of the high-speed optical module.

[0019] The retractable punch mechanism includes a driving block 6 that moves along the Z-axis direction. The number of driving blocks 6 can be one or more. The driving block 6 is connected to a plurality of punch sliders 7 through a ratchet hook 10 structure. The punch sliders 7 can move in the X- and Y-axis directions through the ratchet hook 10 structure. The number of driving blocks 6 and the number of punch sliders 7 need to be set according to the shape of the product. Figure 4 and 5 , which is a schematic diagram of a retractable punch mechanism. The drive block 6 is connected to the Z-axis cylinder or hydraulic cylinder of the punch press. The strokes of the punch sliders 7 can be the same or different, and need to be set according to the shape of the product. In actual application, each punch slider 7 and the drive block 6 are assembled in the sleeve to achieve constrained positioning, refer to the attached Figure 5 , the dotted line portion is a sleeve, and the portion of the punch slider 7 that acts on the shielding cover 1 protrudes from the bottom of the sleeve.

[0020] Step a, pre-punching guide holes 4: punching guide holes 4 on the material strip 3 with a punch. Figure 3 In the process, the continuous die needs to have at least 2 guide pin holes to accurately position each step during continuous feeding and reduce cumulative errors. Pre-punch the guide holes 4. Like traditional continuous die stamping, the diameter can be 1.03~3.03mm according to the thickness and width of the material being punched. The diameter of the punching punch is 0.015mm larger than the diameter of the guide pin on each side.

[0021] Step b, pre-punching the shape: Using the guide hole 4 as a reference, pre-punch the shape of the part to be formed on the material strip 3, leaving only a few material points. Leaving a few material points is to prevent wrinkles or tears during the subsequent deep drawing process. If the reserved material is too large, wrinkles and tears will occur. If the reserved material is too small, the material points will be unstable and the height of the deep-drawn blank will be insufficient. Refer to the attached Figure 3 The 45° oblique line shaded parts at 5 locations are the pre-punched shape 5 parts.

[0022] Step c, deep drawing: The outer shape of the part except the part to be blanked is deep drawn by the cooperation of the deep drawing punch and the deep drawing die. The deep drawing blank depth is greater than the highest height of the shielding cover 1, and the size of the deep drawing die is slightly larger than the outer shape of the shielding cover 1. Figure 3 The shadowed part of the middle grid is the deep drawing area.

[0023] In this step, in addition to the three-dimensional blanking required in the later stage, other external dimensions need to be drawn. It is necessary to ensure that the drawing coefficient is greater than the limit drawing coefficient, and in this step, the ejection force must be greater than the sticking resistance of the blank and the drawing die, but cannot be greater than the force of deformation and instability of the blank after the drawing punch is pulled out. The shielding cover 1 with complex shape or small side connection R needs to be drawn 4 or more times, and each drawing station needs to be empty for adding drawing oil.

[0024] In this step, the depth of the drawn blank should be at least 1.0 mm greater than the highest height of the shielding cover 1 .

[0025] Step d, three-dimensional side punching: the drawn shielding cover 1 is placed in the punching die 8, the retractable punch mechanism extends into the drawn shielding cover 1, and the outer side of the punch slider 7 is provided with a side blade 9. The punch press runs to the bottom dead center, and the driving block 6 drives the punch slider 7 to run outward. The shape of the side blade 9 on each side of the retractable punch mechanism and the blade shape of each side of the punching die 8 are respectively the same as the outer shape of each side of the corresponding formed shielding cover 1. The running distance of the punch slider 7 is greater than the thickness of the shielding cover 1, that is, the full-circle side cutting is completed. The blade on the punch slider 7 is used to make the packaging surface of the shielding cover 1 flat, and the step tolerance requirement is ±0.05mm. The shape of the blade on each side of the retractable punch mechanism and the blade shape of the punching die 8 are the same as the outer shape of each side of the shielding cover 1. Through the push of the driving block 6, the four sides of the shielding cover 1 can be cut off at one time. Compared with the traditional process of punching and bending before drawing, this solution sets the punching process as the last step, and achieves one-time full-circle side cutting through the stretching punch, thus ensuring the flatness of the end face to the greatest extent.

[0026] In particular, for the location of the positioning foot 2 of the shielding cover 1, a positioning foot 2 notch is correspondingly provided on the side cutting edge 9 of the punch slide 7 to achieve avoidance and blanking.

[0027] Preferably, the shape of the driving block 6 is larger at the top and smaller at the bottom, and the ratchet hook 10 structure includes a ratchet hook 10 arranged on the driving block 6 and a hook-shaped groove 11 arranged on the punch slider 7 and cooperating with the ratchet hook 10, and the shape of the ratchet hook 10 is a ratchet gear shaped and inclined upward.

[0028] Refer to the attached Figure 5 , A comparison of the states before three-dimensional punching and B after three-dimensional punching. During the descent process, the driving block 6 presses the oblique edge of the hook-shaped groove 11 through the ratchet hook 10, thereby driving the punch slider 7 to expand outward, and each punch slider 7 moves along the X or Y axis direction to achieve the expansion of the blade to form the shape of each side of the shielding cover 1. When the driving block 6 rises, the ratchet hook 10 rises and is fully inserted into the hook-shaped groove 11, driving each punch slider 7 to contract, and after the full circumferential side cutting is completed, it leaves the shielding cover 1.

[0029] Preferably, in step c, the material of the drawing punch and the drawing die is a tungsten steel material containing graphite. Since the raw material of the shielding cover 1 is stainless steel or nickel silver, the material of the punch and die should be a tungsten steel material containing graphite, such as Xiamen Chunbao's CD650.

[0030] Preferably, when the punch sliders 7 of the retractable punch mechanism are retracted, the size of the punch formed by the punch sliders 7 is 0.1-0.3 mm smaller than the size of the shielding cover 1. This ensures that the retractable punch mechanism can be fully inserted into the shielding cover 1 without a large gap.

[0031] Preferably, in step d, the size of the punching die 8 is based on the size of the shielding cover 1 and is increased by 0.05 mm on each side.

[0032] Preferably, in step d, when the punch press runs to the bottom dead center, the running distance of the punch slider 7 with the side cutting edge is the thickness of the shielding cover 1 plus 0.5 mm, so as to ensure complete blanking.

[0033] Preferably, in step d, the blanking gap 12 between the punch and the die 8 is 4% of the thickness of the shield 1. In step d, the blanking gap 12 between the punch and die is 4% of the material thickness, which needs to be smaller than the gap of 5% of the material thickness in ordinary stamping, which can further ensure the accuracy of the cutting process. In this case, the material thickness is 0.50mm and the gap is 0.02mm.

[0034] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A precision three-dimensional stamping method for producing an insulating shielding cover for a high-speed optical module, characterized in that: The invention comprises a retractable punch mechanism arranged in a sleeve, wherein the retractable punch mechanism comprises a driving block moving along the Z-axis direction, wherein the driving block is connected to a plurality of punch sliders through a ratchet hook structure, and when the driving block moves up and down along the Z-axis direction, the driving block drives a plurality of punch sliders to retract along the X-axis or Y-axis direction through the ratchet hook structure, and when the punch press is turned on, each punch slider retracts, and at this time, the retractable punch mechanism can extend into the shielding cover, and when the punch press runs to the bottom dead point, the punch slider with a knife edge extends out driven by the driving block, and the precision three-dimensional stamping method comprises the following steps: Pre-punching guide holes: Punching guide holes on the material strip with a punch; Pre-punching shape: Based on the guide hole, pre-punch the shape of the part to be formed on the material strip, leaving only a few material points; Deep drawing: The outer shape of the part except the part to be blanked is drawn out by the cooperation of the drawing punch and the drawing die. The depth of the drawn blank should be greater than the highest height of the shielding cover, and the size of the drawing die is slightly larger than the outer size of the shielding cover. Three-dimensional side punching: The drawn shielding cover is placed in the punching die, and the retractable punch mechanism, i.e., the punching punch, extends into the drawn shielding cover. A side cutting edge is arranged on the outer side of the punch slider. When the punch press runs to the bottom dead center, the driving block drives the punch slider to run outward. The shape of the side cutting edges on each side of the retractable punch mechanism and the cutting edge shape of each side of the punching die are respectively the same as the shape of each side of the corresponding formed shielding cover. The running distance of the punch slider is greater than the thickness of the shielding cover, i.e., the full-circle side cutting is completed. The finished product is discharged after demoulding.

2. The precision three-dimensional stamping method for producing the insulating shielding cover of the high-speed optical module according to claim 1 is characterized in that: The shape of the driving block is larger at the top and smaller at the bottom. The ratchet hook structure includes a ratchet hook arranged on the driving block and a hook-shaped groove arranged on the punch slider and matched with the ratchet hook. The shape of the ratchet hook is a ratchet gear shaped and inclined upward.

3. The precision three-dimensional stamping method for producing the insulating shielding cover of the high-speed optical module according to claim 1 is characterized in that: In the step c, the depth of the drawn blank is at least 1.0 mm greater than the highest height of the shielding cover.

4. The precision three-dimensional stamping method for producing an insulating shielding cover for a high-speed optical module according to claim 1 or 3, characterized in that: In the step c, the material of the drawing punch and the drawing die is tungsten steel material containing graphite.

5. The precision three-dimensional stamping method for producing the insulating shielding cover of the high-speed optical module according to claim 1 is characterized in that: When the punch sliders of the retractable punch mechanism are retracted, the size of the punch formed by the punch sliders is 0.1-0.3 mm smaller than the size of the shielding cover.

6. The precision three-dimensional stamping method for producing the insulating shielding cover of the high-speed optical module according to claim 1 is characterized in that: In the step d, the size of the punching die is based on the size of the shielding cover plus 0.05 mm on each side.

7. The precision three-dimensional stamping method for producing an insulating shielding cover for a high-speed optical module according to claim 1, characterized in that: In the step d, when the punch press runs to the bottom dead center, the running distance of the punch slider with the side cutting edge is the thickness of the shielding cover plus 0.5 mm.

8. The precision three-dimensional stamping method for producing an insulating shielding cover for a high-speed optical module according to claim 1, characterized in that: In the step d, the blanking gap between the punch and the die is 4% of the thickness of the shielding cover.

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