Lower die for stamping box cover of junction box and die device

Abstract

The utility model discloses a lower die and a die device for stamping a box cover of a junction box, the lower die comprises a base and a bottom plate, the bottom plate is sequentially provided with a material cutting and punching station, the material cutting and punching station comprises a circular notch, four first special-shaped notches, four second special-shaped notches and a material cutting boss, the circular notch is used for punching a center hole, and the material cutting boss is used for punching a center hole; the material cutting boss is used for cutting material sheets; the inner frame stretching station comprises a rectangular die cavity and a reset stop block movably connected in the rectangular die cavity; the gasket blanking station comprises a first inner frame receding groove and a gasket blanking notch corresponding to the unfolded shape of the limiting gasket; the punching and trimming station comprises a second inner frame receding groove, an internal trimming notch, two bottom hole notches and four notching notches; a tapping station; the box cover blanking station comprises an external trimming notch; and a flange bending station is arranged on one side of the gasket blanking station, and a driving piece for pushing the semi-finished limiting gasket to the flange bending station is arranged on the other side of the gasket blanking station, so that the material utilization rate and the production efficiency can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric parts production, in particular to a lower die and a die device for punching a junction box cover. Background Art

[0002] Junction boxes are a type of electrical auxiliary material commonly used in decoration. They can protect and connect wires. Due to the complex and diverse environments in which junction boxes are installed, different types of junction boxes and corresponding spare parts are required to meet usage requirements. Common junction boxes are usually boxes with one side open, such as Figure 2 , 3 The cover plate shown can be installed on the box opening of the junction box. The cover plate includes an outer edge portion, a rectangular opening in the middle, and the edge of the rectangular opening is concave and extends to form an inner frame. In the prior art, the production of the cover plate uses an engineering mold, and each step is performed separately, resulting in low production efficiency; punching out the rectangular opening in the middle of the cover plate will generate a lot of waste, which not only increases the production cost, but also causes waste of raw materials.

[0003] In addition, if Figure 4 The limit gasket shown (also commonly called C-shaped steel gasket, washer gasket, etc.) is also a commonly used part. Manufacturers usually set up a separate production line to process the limit gasket, which has high equipment costs and occupies a large area. Utility Model Content

[0004] The utility model is developed to solve the above-mentioned problem, and aims to provide a lower die and a die device for stamping a junction box cover which are helpful to improve production line efficiency and reduce production costs.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A lower die for stamping a junction box cover comprises a base with a blanking space at the bottom and a bottom plate arranged on the base, wherein a cutting and punching station, an inner frame stretching station, a gasket blanking station, a punching and trimming station, a tapping station, and a cover blanking station are sequentially arranged on the bottom plate along the raw material conveying direction, wherein:

[0007] The cutting and punching station includes a circular notch, four first special-shaped notches, four second special-shaped notches and a cutting boss on the bottom plate. The circular notch is used to punch the center hole of the limit gasket, the cutting boss is used to cut the rectangular material sheet, and the four first special-shaped notches and the four second special-shaped notches are used to punch out first special-shaped holes and second special-shaped holes at the four corners of the material sheet respectively, so that a connecting section connecting the material sheet and the material strip is formed between the first special-shaped hole and the second special-shaped hole on the same corner;

[0008] The inner frame stretching station includes a rectangular mold cavity and a reset stopper movably connected in the rectangular mold cavity;

[0009] The gasket blanking station comprises a first inner frame clearance groove and a gasket blanking notch corresponding to the outer edge shape of the limiting gasket in the expanded state;

[0010] The punching and trimming station includes a second inner frame clearance groove, an inner trimming notch corresponding to the shape of the inner edge of the box cover, two bottom hole notches for punching the bottom holes of the ear threaded holes, and four punching notches for punching the U-shaped grooves at the four corners of the box cover;

[0011] There are two tapping mechanisms at the tapping station;

[0012] The box cover blanking station includes an external trimming notch corresponding to the shape of the outer edge of the box cover;

[0013] A side guard bending station is also provided on one side of the gasket blanking station, and a driving member for pushing the limited gasket semi-finished product below the gasket blanking station to the side guard bending station is provided on the other side.

[0014] Furthermore, in the conveying direction perpendicular to the material belt, two mutually symmetrical first special-shaped recesses / second special-shaped recesses form a group; along the conveying direction of the material belt, a group of first special-shaped recesses, a group of second special-shaped recesses, a group of second special-shaped recesses, and a group of first special-shaped recesses are arranged in sequence, the two groups of first special-shaped recesses are symmetrical to each other, and the two groups of second special-shaped recesses are symmetrical to each other.

[0015] Furthermore, the connecting section is in a "J" shape with the bottom facing outwards.

[0016] Furthermore, the sidewall bending station includes four forming protrusions, which are arranged perpendicularly in pairs, and a rectangular groove corresponding to the shape of the gasket body is formed in the middle, and a reset lifting block movably connected by a spring is provided in the rectangular groove.

[0017] Furthermore, the driving member is a cylinder, which is horizontally arranged perpendicular to the conveying direction of the material belt.

[0018] Furthermore, a waste cutting step is provided at one end of the box cover blanking station close to the material strip outlet, for cutting off excess waste at the end of the material strip.

[0019] A mold device comprises the above-mentioned lower mold for stamping the junction box cover and an upper mold matching the lower mold for stamping the junction box cover.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1. The lower die and die device for stamping the junction box cover of the utility model cleverly combine the die required for producing the limit gasket and the die required for processing the cover and arrange them reasonably, which can effectively save production line costs, reduce equipment floor space, improve material utilization, and enhance production line efficiency.

[0022] 2. Since the lower die and die device for stamping the junction box cover have multiple stations, and the multiple stations correspond to different processing procedures, a single stamping stroke of the upper die can simultaneously realize the processing of multiple covers / limiting gaskets at different stages, which can greatly improve production efficiency and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a lower die and a material strip for punching a junction box cover of the utility model;

[0024] Figure 2 This is the structure of the box cover Figure 1 ;

[0025] Figure 3 This is the structure of the box cover Figure 2 ;

[0026] Figure 4 It is a structural schematic diagram of a limit gasket.

[0027] Figure Number:

[0028] 1-box cover, 101-outer edge, 102-U-shaped groove, 103-rectangular mounting opening, 104-inner frame, 105-ear, 106-threaded hole;

[0029] 2-limiting gasket, 201-gasket body, 202-limiting retaining edge, 203-center hole;

[0030] 3- Material strip;

[0031] 10- base;

[0032] 20- bottom plate;

[0033] 30-cutting and punching station, 31-circular notch, 32-first special-shaped notch, 33-second special-shaped notch, 34-cutting boss;

[0034] 40-inner frame stretching station, 41-rectangular mold cavity, 42-reset block;

[0035] 50-gasket blanking station, 51-first inner frame clearance groove, 52-gasket blanking notch;

[0036] 60-punching and trimming station, 61-second inner frame clearance groove, 62-internal trimming notch, 63-bottom hole notch, 64-punching notch;

[0037] 70-tapping station, 71-tapping mechanism;

[0038] 80-box cover blanking station, 81-external trimming notch, 82-waste cutting step;

[0039] 90-side baffle bending station, 91-driving member, 92-forming protrusion. DETAILED DESCRIPTION

[0040] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following embodiments are combined with the accompanying drawings to specifically describe the lower die and die device for stamping the junction box cover of the present invention.

[0041] The mold device includes a lower mold for stamping the junction box cover and an upper mold matching the lower mold for stamping the junction box cover. The upper mold and the lower mold for stamping the junction box cover are arranged relatively to each other up and down. The upper mold is raised and lowered under the action of the power mechanism to complete the mold opening / closing action, thereby realizing the stamping processing of the raw metal plate.

[0042] In this embodiment, the lower die for stamping the junction box cover is used to process Figure 2 , 3 The box cover 1 shown in the figure comprises a rectangular outer edge portion 101, and four corners of the outer edge portion 101 are provided with inclined U-shaped grooves 102, and the notches of the U-shaped grooves 102 face the outside of the box cover 1. The middle of the outer edge portion 101 has a rectangular mounting opening 103, and the edge of the mounting opening 103 is concave to form an inner frame 104, and the inner frame 104 has ears 105 extending toward the middle at both ends, and the ears 105 are provided with threaded holes 106.

[0043] like Figure 4 As shown, the limiting gasket 2 includes a rectangular gasket body 201 and limiting retaining edges 202 extending upward from the four sides of the gasket body 201, and a circular center hole 203 is also opened in the middle of the gasket body 201. In order to save resources and reduce the generation of waste, in this embodiment, the processing production line of the limiting gasket 2 is combined with the processing production line of the box cover 1, and the limiting gasket 2 is processed by using the excess material on the metal strip 3 when processing the box cover 1.

[0044] like Figure 1 As shown, the lower die for stamping the junction box cover comprises a base 10 having a blanking space at the bottom and a bottom plate 20 arranged on the base 10, and a cutting and punching station 30, an inner frame stretching station 40, a gasket blanking station 50, a punching and trimming station 60, a tapping station 70, and a cover blanking station 80 are sequentially arranged on the bottom plate 20 along the raw material conveying direction (the direction indicated by the hollow arrow X in the figure), wherein:

[0045] The cutting and punching station 30 includes a circular notch 31, four first special-shaped notches 32, four second special-shaped notches 33 and a cutting boss 34 provided on the bottom plate 20. The circular notch 31 can cooperate with the punching needle of the upper die to punch the center hole 203 of the limit gasket 2, the cutting boss 34 can cooperate with the corresponding notch on the upper die to cut out a rectangular material sheet, the four first special-shaped notches 32 and the four second special-shaped notches 33 can punch out first special-shaped holes and second special-shaped holes at the four corners of the material sheet respectively, and a connecting section connecting the rectangular material sheet and the material strip 3 is formed between the first special-shaped hole and the second special-shaped hole at the same corner. After passing through the cutting and punching station 30, the material sheet is connected to the material strip 3 only through the connecting sections at the four corners, so as to avoid deformation of the remaining parts of the material strip 3 caused by subsequent stretching.

[0046] The inner frame stretching station 40 includes a rectangular mold cavity 41 and a reset block 42 movably connected to the rectangular mold cavity 41 through a spring, which can cooperate with the upper mold to stretch out the inner frame 104 of the box cover 1. The reset block 42 can push the stretched box cover 1 upward when the upper mold is lifted.

[0047] The gasket blanking station 50 includes a first inner frame clearance groove 51 and a gasket blanking recess 52 corresponding to the outer edge shape of the limiting gasket 2 in the expanded state. The shape of the first inner frame clearance groove 51 corresponds to the inner frame 104, allowing the inner frame 104 to extend into, thereby avoiding interference between the inner frame 104 and the bottom plate 20. The gasket blanking recess 52 is located in the middle of the bottom of the first inner frame clearance groove 51, and can cooperate with the upper mold to cut the limiting gasket semi-finished product from the material strip 3.

[0048] The punching and trimming station 60 includes a second inner frame clearance groove 61, an internal trimming notch 62 corresponding to the shape of the inner edge of the box cover 1, two bottom hole notches 63 for punching the bottom holes of the ear threaded hole 106, and four punching notches 64 for punching the four-corner U-shaped groove 102 of the box cover 1. The shape of the second inner frame clearance groove 61 corresponds to the inner frame 104, and the inner frame 104 can be inserted into it, which can avoid the inner frame 104 from interfering with the bottom plate 20. The four punching notches 64 are located on the periphery of the second inner frame clearance groove 61, and can cooperate with the upper die to punch out the U-shaped groove 102. The internal trimming notch 62 is located in the middle of the bottom of the second inner frame clearance groove 61, and can cooperate with the upper die to cut off the waste at the inner frame 104 and cut out the inner edge shape. The two bottom hole notches 63 are respectively located on both sides of the bottom of the second inner frame clearance groove 61, and can cooperate with the upper die punch to punch out the bottom hole of the threaded hole 106.

[0049] Two tapping mechanisms 71 are provided at the tapping station 70, which can tap the bottom hole to obtain the threaded hole 106. The tapping mechanism 71 can adopt the existing structure, which will not be described in detail here.

[0050] The box cover blanking station 80 comprises an external trimming notch 81 corresponding to the outer edge shape of the box cover 1 , which can cut out the outer edge shape of the box cover 1 so as to separate the box cover 1 from the material strip 3 to obtain a finished box cover 1 .

[0051] A sidewall bending station 90 is further provided on one side of the gasket blanking station 50 , and a driving member 91 for pushing the limited gasket semi-finished product below the gasket blanking station 50 toward the sidewall bending station 90 is provided on the other side.

[0052] Furthermore, in the conveying direction perpendicular to the material belt 3, two mutually symmetrical first special-shaped recesses 32 / second special-shaped recesses 33 form a group; in the conveying direction of the material belt 3, the two groups of first special-shaped recesses 32 are symmetrical to each other, and the two groups of second special-shaped recesses 33 are symmetrical to each other. In this embodiment, a group of first special-shaped recesses 32, a group of second special-shaped recesses 33, a group of second special-shaped recesses 33, and a group of first special-shaped recesses 32 are sequentially arranged along the conveying direction of the material belt 3. In practical applications, two groups of first special-shaped recesses 32 and two groups of second special-shaped recesses 33 may also be arranged in an interlaced manner.

[0053] Furthermore, the connecting section is in a "J" shape with the bottom facing outward, and has good resistance to tensile breakage. When the material sheet is stretched in the inner frame stretching station 40, even if the outer edge of the material sheet is deformed, the four corners are still connected to the material strip 3 through the connecting section and do not fall off, and can continue to move to the subsequent station with the material strip 3.

[0054] Furthermore, the sidewall bending station 90 includes four forming protrusions 92, and the four forming protrusions 92 are arranged perpendicularly to each other in pairs, and a rectangular groove corresponding to the shape of the gasket body 201 is formed in the middle. A reset lifting block (not shown in the figure) movably connected by a spring is provided in the rectangular groove. The limiting gasket semi-finished product can be sunk into the rectangular groove under the stamping of the upper die, and at the same time, the protruding part of the outer edge is bent upward under the interference of the forming protrusions 92 to form a limiting sidewall 202. When the upper die is lifted, the reset lifting block pushes the limiting gasket 2 upward out of the rectangular groove to obtain the final limiting gasket 2 finished product.

[0055] Furthermore, the driving member 91 is a cylinder, which is horizontally arranged perpendicular to the conveying direction of the material belt 3 .

[0056] Furthermore, a waste cutting step 82 is provided at one end of the box cover blanking station 80 close to the outlet of the material strip 3 , which is used to cooperate with the upper die to cut off excess waste at the end of the material strip 3 .

[0057] During processing, under the conveyance of the feeding mechanism, the front end of the material strip 3 first enters the cutting and punching station 30 to punch out the center hole 203 of the limiting gasket 2, the rectangular material sheet and the connecting section connecting the material sheet and the material strip 3; then it enters the inner frame stretching station 40 to stretch out the three-dimensional structure of the inner frame 104 of the box cover 1; then it enters the gasket blanking station 50, cuts the limiting gasket semi-finished product from the material strip 3 and drops it below, and the fallen gasket semi-finished product enters the side folding station 90 under the push of the driving member 91, and the side fold is bent upward under stamping to obtain the limiting gasket 2 finished product, and the limiting gasket 2 finished product is pushed upward out of the rectangular groove by the reset lifting block, and then pushed to the next limiting gasket by the driving member 91. The semi-finished gasket is pushed away from the sidewall bending station 90; the rectangular material sheet leaving the gasket blanking station 50 enters the punching and trimming station 60 with the material strip 3, punches out the U-shaped groove 102 and the bottom hole of the threaded hole 106 under punching, and cuts off the waste material on the edge of the inner frame 104, and cuts out the shape of the inner edge of the box cover 1 including the two ears 105; then enters the tapping station 70 to tap the bottom holes on the two ears 105 to obtain two threaded holes 106; finally, enters the box cover blanking station 80, cuts out the shape of the outer edge of the box cover 1, and the box cover 1 is completely separated from the material strip 3, and the finished box cover 1 falls under the base 10, and the waste material at the front end of the material strip 3 is cut off at the cutting step at the exit of the box cover blanking station 80.

[0058] Since the lower die and die device for stamping the junction box cover have multiple workstations, and the multiple workstations correspond to different processing procedures, in the actual production process, a single stamping stroke of the upper die can simultaneously realize the processing of multiple covers 1 / limiting gaskets 2 at different stages, which can greatly improve production efficiency and reduce production costs.

[0059] The above implementation modes are preferred examples of the present invention and are not intended to limit the protection scope of the present invention.

Claims

1. A lower die for stamping a junction box cover, characterized in that: It includes a base with a blanking space at the bottom and a bottom plate arranged on the base, on which a cutting and punching station, an inner frame stretching station, a gasket blanking station, a punching and trimming station, a tapping station, and a box cover blanking station are arranged in sequence along the raw material conveying direction, wherein: The cutting and punching station comprises a circular notch, four first special-shaped notches, four second special-shaped notches and a cutting boss provided on the bottom plate, wherein the circular notch is used for punching the center hole of the limit gasket, the cutting boss is used for cutting a rectangular material sheet, and the four first special-shaped notches and the four second special-shaped notches are used for punching out first special-shaped holes and second special-shaped holes at four corners of the material sheet respectively, so that a connecting section connecting the material sheet and the material strip is formed between the first special-shaped hole and the second special-shaped hole at the same corner; The inner frame stretching station includes a rectangular mold cavity and a reset stopper movably connected in the rectangular mold cavity; The gasket blanking station comprises a first inner frame clearance groove and a gasket blanking notch corresponding to the outer edge shape of the limiting gasket in the expanded state; The punching and trimming station includes a second inner frame clearance groove, an inner trimming notch corresponding to the shape of the inner edge of the box cover, two bottom hole notches for punching the bottom holes of the ear threaded holes, and four punching notches for punching the U-shaped grooves at the four corners of the box cover; The tapping station is provided with two tapping mechanisms; The box cover blanking station comprises an external trimming notch corresponding to the shape of the outer edge of the box cover; A side guard bending station is also provided on one side of the gasket blanking station, and a driving member for pushing the limited gasket semi-finished product below the gasket blanking station to the side guard bending station is provided on the other side.

2. The lower die for stamping the junction box cover according to claim 1, characterized in that: In a conveying direction perpendicular to the material belt, two mutually symmetrical first special-shaped recesses / second special-shaped recesses form a group; Along the conveying direction of the material belt, a group of the first special-shaped recesses, a group of the second special-shaped recesses, a group of the second special-shaped recesses, and a group of the first special-shaped recesses are arranged in sequence, the two groups of the first special-shaped recesses are symmetrical to each other, and the two groups of the second special-shaped recesses are symmetrical to each other.

3. The lower die for stamping the junction box cover according to claim 1, characterized in that: The connecting section is in a "J" shape with the bottom facing outwards.

4. The lower die for stamping the junction box cover according to claim 1, characterized in that: The edge bending station comprises four forming protrusions, which are arranged perpendicularly to each other in pairs, and a rectangular groove corresponding to the shape of the gasket body is formed in the middle, and a reset lifting block movably connected by a spring is arranged in the rectangular groove.

5. The lower die for stamping the junction box cover according to claim 1, characterized in that: The driving member is a cylinder, which is horizontally arranged perpendicular to the conveying direction of the material belt.

6. The lower die for stamping the junction box cover according to claim 1, characterized in that: The box cover blanking station is also provided with a waste cutting step at one end close to the material strip outlet, which is used to cut off excess waste at the end of the material strip.

7. A mold device, characterized in that: include: The lower die for stamping a junction box cover as claimed in any one of claims 1 to 6 and an upper die matching the lower die for stamping a junction box cover.

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