Shearing type die casting excess material punching die

Abstract

The utility model provides a shearing type die casting excess material punching die which comprises an upper die body and a lower die body, and the upper die body comprises an upper die plate, a sprue punching upper punch, a material pressing plate, a material pressing plate reset device, an overflow groove punching upper punch and a limiting guide sleeve. The lower die comprises a lower die plate, a sprue punching upper punch, a positioning supporting plate, a positioning supporting plate reset device, an overflow groove punching lower punch and a limiting guide column, the sprue punching upper punch and the overflow groove punching upper punch are installed on the two sides of the upper die plate respectively, and the material pressing plate is installed in a through hole formed in the center of the upper die plate through a material pressing bolt. The positioning supporting plate is used for supporting materials to be punched and is installed in a through hole formed in the center of the lower die plate through the positioning supporting plate guide column, the limiting guide column is arranged on the lower die plate, the limiting guide sleeve is arranged on the upper die plate, and the limiting guide sleeve can move along the limiting guide column. And step parts are arranged on the limiting guide columns, and the punch limiting positions of the upper die and the lower die are limited to be preset values through the step parts.

Description

Technical Field

[0001] This utility model relates to the field of die casting production waste material processing, and in particular to a shearing die casting part punching waste material mold. Background Technology

[0002] Die casting is one of the most advanced forming methods currently available. Because it allows for the rapid, high-speed, and high-pressure filling of complex cavities with molten metal, it enables the efficient and rapid production of various complex parts with minimal or no machining. Therefore, it has a wide range of applications, with die-cast parts used in numerous industries including automobiles, motorcycles, machinery, home appliances, 3C products, and daily necessities. Due to the inherent nature of die casting processes, the casting blank mainly consists of a gating system (sprue), the casting itself, and an overflow system (overflow channels and venting channels). The casting blank, for example... Figure 1 As shown. After die casting, the excess material in the sprue and overflow channel needs to be removed. Currently, the most common method for removing excess material from casting blanks is blanking. This method is convenient and quick. A trimming machine can be directly equipped around the die casting machine, and blanking dies can be used to remove excess material and clean up flash, which is easy to automate.

[0003] Existing technology uses a blanking die to cut off excess material. The die structure diagram is as follows: Figure 2 As shown, an inverted blanking method is generally used, where the punching punch is below the die (lower die), and can be either integral or split. The die cavity is above the die (upper die). Due to the large size of the castings, their irregular shapes, and the uncertain distribution of the sprue and overflow channels, the upper die can be arranged in a split configuration. The blanking cutting edge structure is as follows: Figure 3 As shown, the punching gap between the upper and lower dies is determined based on the casting material and the thickness of the ingate.

[0004] In actual production, molds with this structure often exhibit defects such as uneven fracture surfaces ("missing material") and micro-cracks gradually appearing at the gate after blanking, severely impacting the first-pass yield of castings. The main causes of these defects are as follows:

[0005] 1) The gate design of the casting is determined according to the shape of the casting structure. Often, the gate to be punched is not on the same plane as the bottom plane of the casting. That is, the cutting edge of the lower die does not contact the part of the casting blank to be punched. When the upper die punches downward, the casting is subjected to uneven force, resulting in defects such as "missing material" and micro-cracks in the casting.

[0006] 2) The thickness of the casting blank is uneven at the gating inlet and overflow inlet, especially at the ingate, where the thickness is between 2 and 4.5 mm. The most commonly used material for die casting is aluminum alloy, which has poor toughness and plasticity. When the blanking thickness is large, defects such as uneven fracture and "missing material" will occur.

[0007] 3) the lower die is fixed during the punching process, and the upper die uses rubber pressure material to realize "hard" punching, which is easy to damage the casting. Content of the utility model

[0008] According to the technical problem proposed above, a shearing type die cutting excess material mold is provided.The technical means adopted by the utility model are as follows:

[0009] A shearing type die cutting excess material mold, comprising an upper die and a lower die, the upper die comprises an upper die plate, a gate upper punch, a pressure plate, a pressure plate reset device, an overflow groove upper punch and a limiting guide sleeve, the lower die comprises a lower die plate, a gate lower punch, a positioning support plate, a positioning support plate reset device, an overflow groove lower punch and a limiting guide column, the gate upper punch and the overflow groove upper punch are respectively installed on both sides of the upper die plate, the gate lower punch and the overflow groove lower punch are respectively installed on both sides of the lower die plate, the pressure plate is installed in the through hole centrally arranged in the upper die plate through a pressure bolt, and can return to the original position through the pressure plate reset device, the positioning support plate is used for supporting the material to be punched, is installed in the through hole centrally arranged in the lower die plate through a positioning support plate guide column, the limiting guide column is arranged on the lower die plate, the limiting guide sleeve is arranged on the upper die plate, the limiting guide sleeve can move along the limiting guide column, a stepped portion is arranged on the limiting guide column, and the limit positions of the punches of the upper die and the lower die are limited to the preset value through the stepped portion.

[0010] Further, the positions of the gate upper punch and the gate lower punch correspond, the positions of the overflow groove upper punch and the overflow groove lower punch correspond, the gate upper punch and the gate lower punch, the overflow groove upper punch and the overflow groove lower punch are all L-shaped, are symmetrically arranged with the center line of the closed mold as the shaft, the horizontal edge portion of the L-shaped punch is provided with holes for installing a punch fixing bolt and a punch positioning pin, and the upper die plate and the lower die plate at the corresponding positions are also provided with holes for installing the punch fixing bolt and the punch positioning pin, and the end of the vertical edge portion of the L-shaped punch is a punch blade edge with an inclined surface, the punch blade edges of the upper punch and the lower punch are oppositely arranged, so that the knife tip part is in line contact with the casting blank for shearing.

[0011] Further, the pressure plate reset device comprises a pressure spring sleeved on the pressure bolt, the through hole centrally arranged in the upper die plate is a stepped hole, the specification of the through hole close to the lower end is smaller than that of the upper end portion, the rod portion of the pressure bolt is matched with the lower end of the stepped hole, the head portion of the pressure bolt is matched with the upper end of the stepped hole, and the pressure spring is sleeved on the rod portion, the upper end of the pressure spring is in contact with the bottom surface of the upper die plate, and the lower end of the pressure spring is in contact with the top surface of the pressure plate.

[0012] Further, the positioning support plate reset device comprises a support spring sleeved on the positioning support plate guide column, the through hole formed in the center of the lower die plate is a stepped hole, the through hole near the lower end is larger than the upper end, the rod part of the positioning support plate guide column is matched with the upper end of the stepped hole, the head part of the positioning support plate guide column is arranged at the lower end of the stepped hole, and the support spring is sleeved on the rod part of the positioning support plate guide column, the upper end of the support spring is in contact with the bottom surface of the positioning support plate, and the lower end of the support spring is in contact with the top surface of the lower die plate.

[0013] Further, a hole for mounting a casting positioning pin is formed in the positioning support plate, and the casting positioning pin is mounted in the positioning support plate in transition fit.

[0014] Further, the limit position of the punch of the upper die and the lower die is limited to 0.4mm-0.5mm through the stepped part, that is, the distance between the punches corresponding to the upper die and the lower die is at least 0.4mm-0.5mm in the die closing state after the blanking is completed.

[0015] Further, the positioning support plate is 2-3mm higher than the lower punch blade in the initial state of the lower die part.

[0016] The utility model has the advantages that: the utility model locates the casting blank on the lower support plate, the lower positioning support plate can float up and down, the upper die goes down during blanking, the upper pressing plate presses the casting, the upper and lower die punches are in linear contact with the casting blank for shearing, the die guide limiting column is in contact with the guide sleeve when the distance between the upper punch and the lower punch is 0.4mm, and the blanking is completed. The die has the advantages of simple structure, firmness and reliability, stable blanking process, flat and non-deformed casting after blanking, neat and non-defective broken part, no micro-cracks and the like. The blanking punch is in sectional assembly, easy to install and disassemble, convenient for processing and maintenance and replacement, and low die manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 It is a casting blank diagram of the prior art.

[0019] Figure 2 It is a blanking die structure diagram of the prior art.

[0020] Figure 3 It is a blanking blade structure diagram of the prior art.

[0021] Figure 4The utility model discloses shearing type blanking blade structure diagram.

[0022] Figure 5 The utility model discloses shearing type casting blanking excess material mold structure diagram - lower mould plan view.

[0023] Figure 6 The utility model discloses shearing type casting blanking excess material mold structure diagram - lower mould plan view.

[0024] In the drawing: 1. upper mould plate;2. punch fixed bolt;3. punch positioning pin;4. punch sprue upper punch;5. pressure plate;6. pressure bolt;7. pressure spring;8. punch overflow groove upper punch;9. limit guide sleeve;10. limit guide column;11. punch overflow groove lower punch;12. positioning support plate;13. support spring;14. punch sprue lower punch;15. lower mould plate;16. positioning support plate guide sleeve;17. positioning support plate guide column;18. casting positioning pin. DETAILED DESCRIPTION

[0025] In order to make the utility model embodiment's purpose, technical scheme and advantage more clear, below will combine the drawing in the utility model embodiment, clear, complete technical scheme in the utility model embodiment in the utility model embodiment is described, obviously, the described embodiment is the part embodiment of the utility model, instead of all embodiments. Based on the embodiment in the utility model, all other embodiments that the ordinary skill in the art obtains without making the creative labor are within the scope of the utility model protection.

[0026] As Figures 4 to 6 The utility model discloses shearing type die casting blanking excess material mold, including upper die and lower die, the upper die includes upper mould plate 1, punch sprue upper punch 4, pressure plate 5, pressure plate reset device, punch overflow groove upper punch 8 and limit guide sleeve 9, the lower die includes lower mould plate 15, punch sprue lower punch 14, positioning support plate 12, positioning support plate reset device, punch overflow groove lower punch 11 and limit guide column 10, the punch sprue upper punch and punch overflow groove upper punch are installed respectively at both sides of upper mould plate, the punch sprue lower punch and punch overflow groove lower punch are installed respectively at both sides of lower mould plate, the pressure plate is installed in the through -hole that the upper mould plate center sets up to through pressure bolt 6, and can return to the original position through pressure plate reset device, the positioning support plate is used for supporting the material to be punched, and it is installed in the through -hole that the lower mould plate center sets up through positioning support plate guide column, the limit guide column is arranged on the lower mould plate, the limit guide sleeve is arranged on the upper mould plate, the limit guide sleeve can move along the limit guide column, the limit guide column is provided with the step portion, and the limit position of punch of upper die and lower die is limited to the preset value through the step portion.

[0027] Further, the positions of the upper punch and the lower punch of the sprue are corresponding, the positions of the upper punch and the lower punch of the overflow are corresponding, and the upper punch and the lower punch of the sprue and the upper punch and the lower punch of the overflow are L-shaped and symmetrically arranged with the horizontal center line of the closed mold as the axis. The horizontal edge of the L-shaped punch is provided with holes for mounting the punch fixing bolt 2 and the punch positioning pin 3. The upper die plate and the lower die plate at the corresponding position are also provided with holes for mounting the punch fixing bolt and the punch positioning pin. The end of the vertical edge of the L-shaped punch is a punch blade with an inclined surface. The punch blades of the upper punch and the lower punch are oppositely arranged, so that the tip part is in line contact with the casting blank for shearing.

[0028] The punch is designed to be segmented and multiple, each punch is connected to the upper die plate or the lower die plate by a bolt, and the punch is precisely positioned by a punch positioning pin. The segmented punch can be designed to be segmented according to the shape of the casting, the processing technology, and the degree of damage in use, to ensure the use accuracy while reducing the cost.

[0029] As an option, the punch blades of the upper punch of the sprue and the upper punch of the overflow are located on the same horizontal line, and the punch blades of the lower punch of the sprue and the lower punch of the overflow are located on the same horizontal line. As another option, the punch blades of the sprue punch and the overflow punch are not located on the same horizontal line, and are adjusted according to the position and thickness of the casting blank sprue and overflow.

[0030] Further, the pressure plate reset device includes a pressure spring 7 sleeved on the pressure bolt. The through hole in the center of the upper die plate is a stepped hole, the specification of the through hole near the lower end is smaller than that of the upper end, the rod part of the pressure bolt is matched with the lower end of the stepped hole, the head part of the pressure bolt is matched with the upper end of the stepped hole, and the pressure spring is sleeved on the rod part, the upper end of which is in contact with the bottom surface of the upper die plate, and the lower end of which is in contact with the top surface of the pressure plate.

[0031] Further, the positioning support plate reset device includes a support spring 13 sleeved on the positioning support plate guide column. The through hole in the center of the lower die plate is a stepped hole, the specification of the through hole near the lower end is larger than that of the upper end, the rod part of the positioning support plate guide column is matched with the upper end of the stepped hole, and the head part of the positioning support plate guide column is arranged at the lower end of the stepped hole. The support spring is sleeved on the rod part of the positioning support plate guide column, the upper end of which is in contact with the bottom surface of the positioning support plate, and the lower end of which is in contact with the top surface of the lower die plate. The positioning support plate guide column can move along the positioning support plate guide sleeve 16, and the positioning support plate guide sleeve is installed on the positioning support plate.

[0032] As Figure 6As shown, in the embodiment, four limiting guide columns and guide sleeves are arranged at the four corners of the upper and lower mold plates for guiding, the guide columns have steps, and the steps are in contact with the guide sleeves after the mold is closed to limit the position.

[0033] Further, holes for installing the casting positioning pins 18 are formed in the positioning support plate, and the casting positioning pins are installed in the positioning support plate in a transition fit.

[0034] Specifically, the casting blank is positioned by using "one face and two pins". Two casting positioning pins and two positioning support plate guide sleeves are designed and installed on the positioning support plate.

[0035] Further, the limit position of the punch of the upper mold and the lower mold is limited to 0.4mm-0.5mm by the step part, that is, the distance between the punches corresponding to the upper mold and the lower mold is at least 0.4mm-0.5mm in the mold-closed state after the blanking is completed.

[0036] Further, the positioning support plate is 2-3mm higher than the lower punch edge in the initial state of the lower mold part.

[0037] The specific implementation manner of the utility model is as follows:

[0038] Step 1. The shearing type die casting blanking scrap mold is installed on the press by using bolts and pressing plates, the upper mold part is fixed on the workbench of the press, and the lower mold part is fixed on the lower workbench of the press.

[0039] Step 2. The upper mold is driven to go up by the upper workbench of the press, and the mold is opened.

[0040] Step 3. In the initial state of the lower mold part, the positioning support plate is 2-3mm higher than the lower punch edge. The casting blank is placed in the positioning pins of the positioning support plate of the lower mold, the bottom surface of the casting blank is in contact with the positioning support plate, and the "one face and two pins" positioning is realized.

[0041] Step 4. The upper mold goes down, the pressing plate first presses the casting blank, and the upper punch continues to go down and contacts the casting blank to blank the scrap part of the blank, and in the blanking process, the casting blank can move up and down under the guidance of the positioning support plate guide column. The upper and lower edges simultaneously shear the scrap.

[0042] Step 5. In the mold-closed state after the blanking is completed, the limiting guide column and the guide sleeve are in contact, and the blanking punches of the upper mold and the lower mold are guaranteed to have a 0.4mm gap.

[0043] Step 6. The upper mold goes up, the positioning support plate is lifted by the spring, and the casting blank is separated from the lower punch.

[0044] Step 7. The casting blank is taken out, and the separated runner and overflow groove and other scraps are cleaned.

[0045] In the embodiment, the punch Figure 1The shown castings are examples, such as Figure 6 As shown, the number of the adopted punch under the gate is four, the number of the adopted punch under the overflow is four, the center of the castings is positioned by the two holes of the positioning support plate guide sleeve / positioning support plate guide column structure, and the two holes on both sides are connected with the castings positioning pins.

[0046] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A die cutting slug die for a shear die casting, characterized by, The upper die and the lower die are included, the upper die includes an upper die plate, a gate punching upper punch, a pressure plate, a pressure plate reset device, a overflow channel punching upper punch and a limiting guide sleeve, the lower die includes a lower die plate, a gate punching lower punch, a positioning support plate, a positioning support plate reset device, a overflow channel punching lower punch and a limiting guide column, the gate punching upper punch and the overflow channel punching upper punch are respectively installed on both sides of the upper die plate, the gate punching lower punch and the overflow channel punching lower punch are respectively installed on both sides of the lower die plate, the pressure plate is installed in the through hole of the upper die plate through pressure bolts, and can return to the original position through the pressure plate reset device, the positioning support plate is used for supporting the material to be punched, is installed in the through hole of the lower die plate through the positioning support plate guide column, the limiting guide column is arranged on the lower die plate, the limiting guide sleeve is arranged on the upper die plate, the limiting guide sleeve can move along the limiting guide column, the limiting guide column is provided with a step part, and the limiting position of the punch of the upper die and the lower die is limited to a preset value through the step part.

2. The trim-to-size die for cutting a shear die casting according to claim 1, wherein The positions of the gate punching upper punch and the gate punching lower punch correspond, the positions of the overflow channel punching upper punch and the overflow channel punching lower punch correspond, the gate punching upper punch and the gate punching lower punch, the overflow channel punching upper punch and the overflow channel punching lower punch are all L-shaped, are symmetrically arranged with the center line of the closed die as the axis, and the horizontal edge part of the L-shaped punch is provided with holes for installing punch fixing bolts and punch positioning pins, the upper die plate and the lower die plate at the corresponding positions are also provided with holes for installing punch fixing bolts and punch positioning pins, and the end of the vertical edge part of the L-shaped punch is a punching blade edge with an inclined surface, the punching blade edges of the upper punch and the lower punch are oppositely arranged, so that the knife tip part is in line contact with the casting blank for shearing.

3. The trim-to-size die of claim 1 wherein, The pressure plate reset device includes a pressure spring sleeved on the pressure bolt, the through hole of the upper die plate is a stepped hole, the specification of the through hole near the lower end is smaller than that of the upper end part, the rod part of the pressure bolt is matched with the lower end of the stepped hole, the head part of the pressure bolt is matched with the upper end of the stepped hole, and the pressure spring is sleeved on the rod part, the upper end of the pressure spring is in contact with the bottom surface of the upper die plate, and the lower end of the pressure spring is in contact with the top surface of the pressure plate.

4. The trim-to-size die of claim 1 wherein, The positioning support plate reset device includes a support spring sleeved on the positioning support plate guide column, the through hole of the lower die plate is a stepped hole, the specification of the through hole near the lower end is larger than that of the upper end part, the rod part of the positioning support plate guide column is matched with the upper end of the stepped hole, the head part of the positioning support plate guide column is arranged at the lower end of the stepped hole, and the support spring is sleeved on the rod part of the positioning support plate guide column, the upper end of the support spring is in contact with the bottom surface of the positioning support plate, and the lower end of the support spring is in contact with the top surface of the lower die plate.

5. The trim-to-size die of claim 1 wherein, The positioning support plate is provided with a hole for installing a casting positioning pin.

6. The trim-to-size die of claim 1 wherein, The limiting position of the punch of the upper die and the lower die is limited to 0.4mm-0.5mm through the step part.

7. The trim-to-size die of claim 1 wherein, When the lower die part is in the initial state, the positioning support plate is 2-3mm higher than the blade edge of the lower punch.

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