A fine blanking die structure for hardware castings

Abstract

The utility model provides a kind of precision die structure of hardware casting, its upper die component includes top plate, the mounting plate of parallel and interval installation in the below of top plate and punch cutting device;Punch cutting device includes fixed in the edge cutting template component of mounting plate bottom surface, first guide cavity with verticality has in edge cutting template component, first guide cavity is equipped with the material return plate component of elastically liftable, the center of material return plate component has vertical through second guide cavity, second guide cavity is slidably installed with punch holder, and the bottom surface of punch holder has several punch pins, and the top end is connected with oil cylinder.Precision punching process, under the drive of oil press, die is closed, and the edge cutting of hardware part is completed by edge cutting template component, then punch holder is driven to descend by oil cylinder, and each punch pin completes the edge punching of each hole of hardware part;The mode of being cut into two steps can avoid the huge die closing force of oil press to break small size punch pin, not only reduce processing cost, but also improve production efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to the post processing equipment technical field of casting hardware, specifically point to a kind of hardware casting's fine punching die structure. BACKGROUND

[0002] Hardware casted, there will be burr or sprue at the line of closing mould and feeding port of casting mould, need to be removed subsequently, and efficient method is to remove by fine punching die. Fine punching die usually includes cutter die for punching the edge of hardware, and punch pin for punching the edge of hole on hardware, and fine punching die is driven by oil press to complete punching. However, when there are many small size holes on hardware, fine punching die needs to be correspondingly provided with many punch pins to punch the edge of these holes. Since the closing impact force of oil press is very large, these small diameter punch pins are very easy to break, which not only increases cost, but also greatly affects production efficiency due to frequent replacement of punch pins. SUMMARY

[0003] The utility model discloses a kind of hardware casting fine punching die structure of punch pin not easy to break.

[0004] To achieve the above object, the technical scheme adopted by the utility model is as follows:

[0005] A kind of hardware casting fine punching die structure, including upper die assembly and lower die assembly, the upper die assembly includes top plate, installation plate fixedly installed in parallel and interval below the top plate, and punching device;The punching device includes the edge cutting die plate assembly fixed on the bottom surface of the installation plate, the edge cutting die plate assembly has the first guide cavity vertically, the first guide cavity is slidably installed with the material return plate assembly that can be elastically lifted, the center of the material return plate assembly has the second guide cavity vertically through, the second guide cavity is slidably installed with punch head mounting seat, the bottom surface of the punch head mounting seat is detachably installed with a plurality of punch pins, and the top end of the punch head mounting seat is connected with an oil cylinder for driving the lifting thereof.

[0006] A preferred scheme, the top end of the material return plate assembly is fixed with a plurality of vertical guide columns, which are movably penetrated through the edge cutting die plate assembly and the installation plate, the top end of the guide column is fixed with a support plate parallel to the top plate, and a plurality of vertical springs are arranged between the support plate and the top plate.

[0007] A preferred scheme, the oil cylinder is vertically fixed on the bottom surface of the top plate, and the connecting part of the oil cylinder and the punch head mounting seat movably penetrates through the support plate, the installation plate and the edge cutting die plate assembly.

[0008] A preferred scheme, a plurality of sets of the punching device are arranged on the installation plate.

[0009] In a preferred embodiment, the material returning plate assembly comprises a limiting plate on the upper portion and a pressing plate fixed concentrically on the bottom of the limiting plate, the limiting plate has a larger outer periphery than the pressing plate; and the upper section of the first guide cavity has a limiting cavity with a diameter matching the limiting plate and a height greater than the thickness of the limiting plate.

[0010] In a preferred embodiment, the trimming die plate assembly comprises a first plate, a second plate and a trimming die plate fixed in sequence from top to bottom.

[0011] The utility model discloses the beneficial effect lies in: in the fine blanking process, the upper die assembly is driven by the oil press and closes with the lower die assembly, and the trimming die plate assembly finishes the punching of the outer edge of the hardware, and then the punch mounting seat is driven to descend by the oil cylinder, and each punch needle finishes the punching of the hole edge of the hardware, the two-step punching mode can avoid the huge closing force of the oil press to break the small size punch needle, not only reduces the processing cost, but also avoids frequent shutdown, thereby improve production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0012] The utility model will be further explained in detail in combination with the drawings and specific embodiments.

[0013] Fig. 1 It is the whole installation structure schematic diagram of fine blanking die in the embodiment;

[0014] Fig. 2 It is the section structure schematic diagram of fine blanking die in the embodiment;

[0015] Fig. 3 It is the part exploded structure schematic diagram of punching device in the embodiment. PREFERRED EMBODIMENT

[0016] The utility model will be further explained in detail in combination with the drawings and specific embodiments.

[0017] It is necessary to explain that the word indicating the direction in this application file, such as top surface, bottom surface, vertical direction etc. are only for the convenience of more intuitive description of structure in combination with the drawings, and not the limitation of product structure.

[0018] REFERENCE Figs. 1 to 3As shown, a fine blanking die structure of a hardware casting includes an upper die assembly and a lower die assembly, the upper die assembly includes a top plate 1, a mounting plate 2 fixedly installed in parallel and spaced below the top plate 1, and a punching device; the punching device includes a trimming die plate assembly 3 fixed to the bottom surface of the mounting plate 2, the trimming die plate assembly 3 has a vertical first guide cavity 31 therein, the first guide cavity 31 slidably installs an elastically liftable material return plate assembly 4 therein, the center of the material return plate assembly 4 has a vertical second guide cavity 41 therethrough, the second guide cavity 41 slidably installs a punch mounting shaft 5 therein, the bottom surface of the punch mounting shaft 5 detachably installs a plurality of punch pins 51, and the top end of the punch mounting shaft 5 is connected with an oil cylinder 52 driving it to lift.

[0019] In the fine blanking process, the upper die assembly is closed with the lower die assembly under the drive of the oil press, the material return plate assembly 4 elastically presses the top surface of the hardware product, and the trimming die plate assembly 3 outside the material return plate assembly 4 completes the trimming of the outer edge of the hardware, then the oil cylinder 52 drives the punch mounting shaft 5 to descend, and each punch pin 51 completes the trimming of the edge of each hole of the hardware, after the trimming is completed, the oil cylinder 52 drives each punch pin 51 to rise and reset, and the upper die assembly as a whole is driven to rise by the oil press to complete the opening of the die. The two-step trimming method can avoid the large closing force of the oil press to break the small size punch pin 51, not only reduces the processing cost, but also avoids frequent shutdown, thereby improving the production efficiency.

[0020] In a preferred embodiment, the top end of the material return plate assembly 4 of the embodiment is fixed with a plurality of vertical movable guide columns 42 penetrating through the trimming die plate assembly 3 and the mounting plate 2, the top end of the guide column 42 is fixed with a support plate 43 parallel to the top plate 1, and a plurality of vertical springs 44 are arranged between the support plate 43 and the top plate 1. The spring 44 of the material return plate assembly 4 is installed between the top plate 1 and the mounting plate 2 through the guide column 42 and the support plate 43, so that it has enough installation space. Of course, in other embodiments, the spring 44 can also be directly arranged between the material return plate assembly 4 and the mounting plate 2, but the trimming die plate assembly 3 needs to have enough height, and the height of the spring 44 needs to be shortened as much as possible, so that the material return plate assembly 4 has enough lifting space and elastic ability.

[0021] In a preferred embodiment, the oil cylinder 52 is vertically fixed to the bottom surface of the top plate 1, and the connecting part of the oil cylinder 52 and the punch mounting shaft 5 is movably penetrated through the support plate 43, the mounting plate 2 and the trimming die plate assembly 3. Similarly, the spacing space between the top plate 1 and the mounting plate 2 facilitates the installation of the oil cylinder 52, and the diameter of the oil cylinder 52 does not occupy the transverse space of the trimming die plate assembly 3, so that more sets of punching devices can be arranged on the mounting plate 2. In other embodiments, the oil cylinder 52 can also be fixed to the bottom of the mounting plate 2, and in this case, only sufficient vertical and transverse installation space needs to be provided inside the trimming die plate assembly 3.

[0022] In a preferred embodiment, the mounting plate 2 is provided with a plurality of sets of punching devices. Since the punching device occupies a small transverse space, a plurality of sets of punching devices can be densely arranged on the mounting plate 2, thereby improving the processing efficiency.

[0023] In a preferred embodiment, the material return plate assembly 4 includes a limiting plate 4a at the upper portion and a pressing plate 4b concentrically fixed to the bottom of the limiting plate 4a, and the outer contour of the limiting plate 4a is larger than that of the pressing plate 4b; and the upper segment of the first guide cavity 31 has a limiting cavity 311 with a diameter adapted to the limiting plate 4a and a height greater than the thickness of the limiting plate 4a. The height of the limiting cavity 311 is used to limit the lifting position of the material return plate assembly 4, thereby accurately controlling the lifting position of each punching pin 51.

[0024] In a preferred embodiment, the trimming die plate assembly 3 includes a first plate 3a, a second plate 3b and a knife die plate 3c fixed in sequence from top to bottom. The trimming die plate assembly 3 is stacked by a plurality of plates, which can provide sufficient lifting space for the first guide cavity 31, facilitate the machining of the limiting cavity 311, i.e., machining the local part of the limiting cavity 311 on each plate first, then stacking and fixing them together, and also facilitate the assembly of the punching device.

[0025] The above description is not intended to limit the technical scope of the present application, and any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. A fine blanking die structure for a hardware casting comprising an upper die assembly and a lower die assembly, characterized by: The upper die assembly comprises a top plate, a mounting plate fixedly installed below the top plate in parallel and at intervals, and a punching device; the punching device comprises a trimming die plate assembly fixed to the bottom surface of the mounting plate, the trimming die plate assembly has a vertical first guide cavity therein, an elastically liftable material return plate assembly is slidingly installed in the first guide cavity, the material return plate assembly has a vertical second guide cavity passing through the center thereof, a punch mounting seat is slidingly installed in the second guide cavity, a plurality of punch pins are detachably installed on the bottom surface of the punch mounting seat, and an oil hydraulic cylinder driving the punch mounting seat to lift is connected to the top end of the punch mounting seat.

2. The fine blanking die structure for a hardware casting according to claim 1, wherein: The top end of the material return plate assembly is fixed with a plurality of vertical guide columns which pass through the trimming die plate assembly and the mounting plate, the top end of the guide columns is fixed with a support plate parallel to the top plate, and a plurality of vertical springs are arranged between the support plate and the top plate.

3. The fine blanking die structure of a hardware casting according to claim 2, wherein: The oil hydraulic cylinder is vertically fixed to the bottom surface of the top plate, and the connecting part of the oil hydraulic cylinder and the punch mounting seat passes through the support plate, the mounting plate and the trimming die plate assembly.

4. The fine blanking die structure of a hardware casting according to claim 3, wherein: A plurality of groups of the punching device are arranged on the mounting plate.

5. The fine blanking die structure of a hardware casting according to claim 1, wherein: The material return plate assembly comprises a limiting plate at the upper portion and a pressing plate fixed concentrically to the bottom of the limiting plate, the limiting plate has an outer contour larger than the pressing plate, and the upper section of the first guide cavity has a limiting cavity with a diameter matching the limiting plate and a height greater than the thickness of the limiting plate.

6. The fine blanking die structure of a hardware casting according to claim 5, wherein: The trimming die plate assembly comprises a first plate, a second plate and a knife die plate which are sequentially and fixedly stacked from top to bottom.

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