An aluminum-steel mold for pre-embedded fasteners

Abstract

This invention discloses an aluminum-steel mold for pre-embedded fasteners, comprising an upper mold and a lower mold for molding products with pre-embedded fasteners; wherein the upper mold and the lower mold are made of aluminum alloy; the upper mold has a first blind hole for positioning the fastener; the lower mold has an insert made of steel, and the insert has a second blind hole for inserting the fastener. The aluminum-steel mold uses aluminum alloy for the upper and lower molds and steel for the insert. The product is molded through a cavity made of aluminum alloy, and the fastener is molded into the product through the steel insert. This solves the problems of high price and long lead time associated with pure steel molds, and also addresses the shortcomings of low strength, easy deformation, and poor wear resistance of pure aluminum alloy molds.

Description

Technical Field

[0001] This invention relates to the field of molds, and more specifically to an aluminum-steel mold for pre-embedded fasteners. Background Technology

[0002] In recent years, the process of pre-embedded parts such as nuts and bolts has been widely used in the manufacturing of composite materials, such as pure PCM molding, steel with glass fiber, steel with PU, steel with PP, etc. Its advantages are mainly high connection strength, torque force that can meet customer requirements, saving molding time, greatly reducing defect rate and cost, improving production efficiency, and the surface flatness and appearance of pre-embedded parts are good.

[0003] The materials used to manufacture workpieces with pre-embedded nuts and bolts are generally more complex steel molds, and the materials are usually carbon structural steel, alloy steel, carbon tool steel and stainless steel, etc.

[0004] However, steel molds are expensive, heavy, complex in structure, and have a long processing cycle, all of which are problems that need to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide an aluminum-steel mold for pre-embedded fasteners, so as to solve the technical problems of high cost, large weight, complex structure and long processing cycle of steel molds.

[0006] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0007] An aluminum-steel mold for pre-embedded fasteners includes: an upper mold and a lower mold, the upper mold and the lower mold being used for molding products with pre-embedded fasteners; wherein, the upper mold and the lower mold are made of aluminum alloy; the upper mold is provided with a first blind hole for positioning the fastener; an insert is installed on the lower mold, the insert is made of steel, and a second blind hole is formed on the insert for inserting the fastener.

[0008] Furthermore, the cross-sectional shape of the insert is a regular polygon, the cross-sectional shape of the second blind hole is a regular polygon, and the cross-sectional shape of the first blind hole is a circle.

[0009] Furthermore, the insert is connected to the lower mold via a female insert. The female insert is made of aluminum alloy and has a third blind hole formed on it. The third blind hole is used to insert the insert.

[0010] Furthermore, molten metal is filled into the cylindrical gap between the insert and the third blind hole. After the molten metal cools and solidifies, the connection between the insert and the mother insert is ground and polished to make it smooth.

[0011] Furthermore, an annular runner is formed at the edge of the third blind hole. The annular runner is a groove formed around the edge of the insert, and one corner of the annular runner expands horizontally outward to form a main runner for easy pouring.

[0012] Furthermore, an venting channel is formed inside the insert or the female insert. One end of the venting channel is connected to the lowest point of the gap between the third blind hole and the insert, and the other end of the venting channel passes through the top of the insert or the female insert.

[0013] Furthermore, the exhaust channel includes a first channel, a second channel, and a third channel formed inside the insert and connected in sequence. The first channel extends from the bottom edge of the insert to the middle of the insert, the second channel extends from the side wall of the insert to the center of the insert, and the third channel extends from the center of the insert to the top wall of the insert.

[0014] Furthermore, the first channel includes an annular slit and a fourth blind hole. The annular slit is formed between the bottom wall edge of the insert and the bottom wall edge of the third blind hole. The annular slit is formed on the insert and / or the mother insert. The fourth blind hole is formed on the insert and is perpendicular to the bottom wall of the insert. The fourth blind hole connects the inner edge of the annular slit. The outer edge of the annular slit connects the cylindrical slit between the side wall of the insert and the side wall of the third blind hole.

[0015] Furthermore, the second channel includes a fifth blind hole and a sealing plug. The fifth blind hole penetrates vertically through the sidewall of the insert, and the middle of the fifth blind hole connects to the fourth blind hole. The end of the fifth blind hole facing the outside of the insert is sealed by the sealing plug.

[0016] Furthermore, the third channel includes a sixth blind hole, which penetrates vertically through the top wall of the insert and extends to the end of the fifth blind hole. The diameter of the sixth blind hole is smaller than that of the second blind hole, and the depth of the sixth blind hole is greater than that of the second blind hole.

[0017] Compared with the prior art, this application has the following advantages:

[0018] An aluminum-steel mold for pre-embedded fasteners is provided. The upper and lower molds are made of aluminum alloy, and the inserts are made of steel. The product is molded through the cavity made of aluminum alloy, and the fasteners are molded into the interior of the product through the inserts made of steel. This solves the disadvantages of high price and long production time of pure steel molds, and also solves the disadvantages of low strength, easy deformation and poor wear resistance of pure aluminum alloy molds. Attached Figure Description

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] Figure 1 This is a front view of the lower mold according to an embodiment of the present invention;

[0021] Figure 2 This is a top view of the lower mold according to an embodiment of the present invention;

[0022] Figure 3 This is a bottom view of the upper mold according to an embodiment of the present invention;

[0023] Figure 4 This is a left view of the upper mold according to an embodiment of the present invention;

[0024] Figure 5 This is a front view of the upper mold according to an embodiment of the present invention;

[0025] Figure 6 This is a perspective view of the insert according to an embodiment of the present invention;

[0026] Figure 7 This is a bottom view of the insert according to an embodiment of the present invention;

[0027] Figure 8 for Figure 7 A cross-sectional view along the AA direction;

[0028] Figure 9 This is a perspective view of the female insert according to an embodiment of the present invention;

[0029] Figure 10 This is a bottom view of the female insert according to an embodiment of the present invention;

[0030] Figure 11 for Figure 10 A cross-sectional view along the BB direction;

[0031] Figure 12 This is a perspective view of the assembly state of the insert, the female insert, and the lower mold according to an embodiment of the present invention;

[0032] Figure 13 This is a top view of the assembly state of the insert, the female insert, and the lower mold according to an embodiment of the present invention;

[0033] Figure 14 for Figure 13 A cross-sectional view along the CC direction;

[0034] Figure 15This is a perspective view of the assembled and cast insert, female insert, and lower mold according to an embodiment of the present invention.

[0035] Figure 16 for Figure 15 A cross-sectional view along the DD direction;

[0036] The labels in the diagram represent the following:

[0037] 1-Upper mold; 11-First blind hole; 12-Guide pillar; 13-Air inlet; 14-Air outlet; 15-Oil inlet; 16-Oil outlet; 2-Lower mold; 21-Guide hole; 3-Insert; 31-Second blind hole; 4-Female insert; 41-Third blind hole; 42-Annular runner; 43-Main runner; 44-Cylindrical gap; 5-Exhaust channel; 51-First channel; 511-Annular gap; 512-Fourth blind hole; 52-Second channel; 521-Fifth blind hole; 522-Sealing plug; 53-Third channel; 531-Sixth blind hole. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Aluminum molds are low in cost, lightweight, and simple in structure, but have a long processing cycle. To address this issue, the following provides an aluminum-steel hybrid mold for pre-embedded fasteners. Please refer to [reference needed]. Figure 1-5 .

[0040] The aluminum mold and steel mold includes: upper mold 1 and lower mold 2. Upper mold 1 and lower mold 2 are used for molding products with pre-embedded fasteners.

[0041] The upper mold 1 and the lower mold 2 are made of aluminum alloy.

[0042] The upper mold 1 is provided with a first blind hole 11 for positioning fasteners;

[0043] The lower mold 2 is fitted with an insert 3, which is made of steel and has a second blind hole 31 for inserting fasteners.

[0044] Aluminum alloys are low in strength, easily deformed, and not wear-resistant, making them unsuitable for manufacturing molding dies for mass production. However, by mixing aluminum molds with 45# steel inserts 3, the aluminum molds are used to mold the products, and the 45# steel inserts 3 are used to mold the fasteners. This solves the problems of expensive steel molds for molding products and short lifespan of fasteners embedded in aluminum molds.

[0045] Depending on the needs, it can also:

[0046] Please refer to Figure 1 , 2 The upper mold 1 is mounted on the upper pressure plate of the mold, and the lower mold 2 is mounted on the lower pressure plate of the mold. The mold cavity is made into an upper concave mold and a lower convex mold according to the sample to be manufactured.

[0047] The entire mold is made in an overflow mold fitting form. The upper mold 1 and the lower mold 2 are provided with overflow channels at the four corners, so that when the mold is closed, the overflow channels of the upper and lower molds 2 can be combined to form a larger diameter overflow channel.

[0048] Please refer to Figure 4 , 5 Each of the four corners of the upper mold 1 is provided with a guide post 12, and each of the four corners of the lower mold 2 is provided with a guide hole 21. The guide hole 21 corresponds to the guide post 12. The outer diameter of the guide post 12 is slightly smaller than that of the guide hole 21. The guide post 12 is combined with the chamfer to facilitate positioning and mold closing during mold installation.

[0049] Please refer to Figure 4 The upper mold 1 has an internal pre-embedded ejector pin (not shown in the figure). The upper mold 1 has an air inlet 13 and an air outlet 14 on its left and right sides. The air inlet 13 and the air outlet 14 are connected to a compressed air source through an air pipe. The air outlet is connected to the ejector pin through the air passage inside the upper mold 1. After the workpiece is pressed, the ejector pin works by compressing gas, thereby pushing the workpiece downward to assist in demolding.

[0050] Please refer to Figure 5 Oil inlet holes 15 and oil outlet holes 16 are provided on the front and rear sides of the upper mold 1 and the lower mold 2. Oil passages are provided inside the upper mold 1 and the lower mold 2. The oil inlet holes 15 and the oil outlet holes 16 are connected to an oil pump and a heater for heating the upper mold 1 and the lower mold 2.

[0051] Optional:

[0052] Please refer to Figure 1 , 2 The cross-sectional shape of the insert 3 is a regular hexagon, the cross-sectional shape of the second blind hole 31 is a regular hexagon, and the depth of the second blind hole 31 is 50mm.

[0053] Please refer to Figure 3 The cross-sectional shape of the first blind hole 11 is circular.

[0054] A third blind hole 41 is formed on the lower mold 2. The cross-sectional shape of the third blind hole 41 is a regular hexagon. The third blind hole 41 is used to insert the insert 3.

[0055] The insert 3 and the third blind hole 41 are connected by welding or bolt hanging.

[0056] The specific size, number, and location of the first blind hole 11, the second blind hole 31, and the third blind hole 41 are determined according to the process parameters of the workpiece.

[0057] Furthermore, to ensure that insert 3 does not shift when upper mold 1 and lower mold 2 are closed, please refer to... Figure 14 , 16 :

[0058] Molten metal is filled into the gap between the insert 3 and the third blind hole 41. After the molten metal cools and solidifies, the connection between the insert 3 and the third blind hole 41 is ground and polished to make it smooth.

[0059] The molten metal liquid is made by melting No. 45 steel scraps at high temperature.

[0060] Optionally, since insert 3 and the third blind hole 41 are connected by casting, replacing insert 3 is inconvenient. To facilitate mold repair, please refer to... Figure 14 , 16 The insert 3 is connected to the lower mold 2 through the female insert 4, and the third blind hole 41 is formed on the female insert 4. The female insert 4 is made of aluminum alloy.

[0061] The lower mold 2 has blind holes or through holes for installing the female insert 4. The female insert 4 is connected to the lower mold 2 by means of a mounting plate, bolts or welding.

[0062] For further details, please refer to Figure 6-16 The figure shows a process step of filling the gap between the insert 3 and the third blind hole 41 by filling the gap with molten metal liquid.

[0063] in, Figure 6-8 This is an attached image of inlay 3. Figure 9-11 The attached image is of mother inlay 4. Figure 12-14 This is the assembly drawing of insert 3 and female insert 4. Figure 15 , 16 This is an assembly drawing showing the connection of insert 3 and female insert 4 after casting.

[0064] The edge of the third blind hole 41 is formed with an annular runner 42, which is a groove formed around the edge of the insert 3. One corner of the annular runner 42 expands outward horizontally to form a main runner 43 for easy pouring.

[0065] The worker pours molten metal onto the main runner 43. The molten metal flows through the main runner 43 and fills the annular runner 42, and then flows along the annular runner 42 into the gap between the third blind hole 41 and the insert 3.

[0066] Furthermore, in order to eliminate the negative impact of air in the gap between the third blind hole 41 and the insert 3 on the pouring.

[0067] An exhaust channel 5 is formed inside the insert 3 or the female insert 4. One end of the exhaust channel 5 is connected to the lowest point of the gap between the third blind hole 41 and the insert 3, and the other end of the exhaust channel 5 passes through the top of the insert 3 or the female insert 4.

[0068] To accelerate the flow of molten metal and reduce the possibility of it solidifying before filling the gaps, a vacuum pump can be installed at the end of the exhaust channel 5 that connects to the atmosphere. The vacuum suction will then accelerate the flow of the molten metal.

[0069] Optionally, the exhaust channel 5 includes a first channel 51, a second channel 52 and a third channel 53 formed inside the insert 3 and connected in sequence. The first channel 51 extends from the bottom edge of the insert 3 to the middle of the insert 3, the second channel 52 extends from the side wall of the insert 3 to the center of the insert 3, and the third channel 53 extends from the center of the insert 3 to the top wall of the insert 3.

[0070] When accelerating the flow rate of molten metal by vacuum pumping, it is only necessary to pump the opening of the third channel 53 located on the top wall of the insert 3.

[0071] The first channel 51 includes an annular slit 511 and a fourth blind hole 512. The annular slit 511 is formed between the bottom wall edge of the insert 3 and the bottom wall edge of the third blind hole 41. The annular slit 511 is formed on the insert 3 and / or the female insert 4. The fourth blind hole 512 is formed on the insert 3 and is perpendicular to the bottom wall of the insert 3. The fourth blind hole 512 connects to the inner edge of the annular slit 511. The outer edge of the annular slit 511 connects to the cylindrical slit 44 between the side wall of the insert 3 and the side wall of the third blind hole 41.

[0072] The second channel 52 includes a fifth blind hole 521 and a sealing plug 522. The fifth blind hole 521 penetrates vertically through the side wall of the insert 3. The middle part of the fifth blind hole 521 is connected to the fourth blind hole 512. The end of the fifth blind hole 521 facing the outside of the insert 3 is sealed by the sealing plug 522.

[0073] The third channel 53 includes a sixth blind hole 531, which vertically penetrates the top wall of the insert 3. The diameter of the sixth blind hole 531 is smaller than the diameter of the second blind hole 31, and the depth of the sixth blind hole 531 is greater than the depth of the second blind hole 31.

[0074] After the insert 3, the female insert 4 and the lower mold 2 are assembled and the upper mold 1 and the lower mold 2 are successfully closed, the insert 3 is further processed to mill the circular sixth blind hole 531 into a regular hexagonal second blind hole 31.

[0075] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered as falling within the scope of protection of the embodiments of the present invention.

Claims

1. An aluminum die mixed steel die mold for embedding a fastener, characterized in that, an upper die (1) and a lower die (2) for molding a product in which a fastener is embedded; comprising: wherein the upper die (1) and the lower die (2) are made of an aluminum alloy material; a first blind hole (11) for positioning the fastener is formed on the upper die (1); a second blind hole (31) for embedding the fastener is formed on an insert (3) installed on the lower die (2), the insert (3) being made of a steel material; the insert (3) is connected to the lower die (2) through a female insert (4) made of an aluminum alloy material, the female insert (4) having a third blind hole (41) formed thereon for embedding the insert (3); a cylindrical gap (44) between the insert (3) and the third blind hole (41) is filled with a molten metal liquid, and after the metal liquid is cooled and solidified, the connecting portion between the insert (3) and the female insert (4) is polished and smoothed; an edge of the third blind hole (41) is formed with an annular runner (42), the annular runner (42) being a groove formed around the edge of the insert (3), one corner of the annular runner (42) being horizontally expanded outward to form a main runner (43) for facilitating pouring.

2. The aluminum die mixed steel die mold for embedding a fastener according to claim 1, characterized in that, the cross-sectional shape of the insert (3) is a regular polygon, the cross-sectional shape of the second blind hole (31) is a regular polygon, and the cross-sectional shape of the first blind hole (11) is a circle.

3. The aluminum die mixed steel die mold for embedding a fastener according to claim 1, characterized in that, an exhaust passage (5) is formed inside the insert (3) or the female insert (4), one end of the exhaust passage (5) being connected to the lowest portion of the gap between the third blind hole (41) and the insert (3), and the other end of the exhaust passage (5) penetrating through the top of the insert (3) or the female insert (4).

4. The aluminum die mixed steel die mold for embedding a fastener according to claim 3, characterized in that, the exhaust passage (5) includes a first passage (51), a second passage (52), and a third passage (53) sequentially connected and formed inside the insert (3), the first passage (51) extending from the bottom edge of the insert (3) to the middle portion of the insert (3), the second passage (52) extending from the side wall of the insert (3) to the center of the insert (3), and the third passage (53) extending from the center of the insert (3) to the top wall of the insert (3).

5. The aluminum die mixed steel die mold for embedding a fastener according to claim 4, characterized in that, ​ The first channel (51) comprises an annular gap (511) and a fourth blind hole (512), the annular gap (511) is formed between the bottom wall edge of the insert (3) and the bottom wall edge of the third blind hole (41), the annular gap (511) is formed on the insert (3) and / or the female insert (4), the fourth blind hole (512) is formed on the insert (3) and is perpendicular to the bottom wall of the insert (3), the fourth blind hole (512) is connected to the inner edge of the annular gap (511), and the outer edge of the annular gap (511) is connected to the cylindrical gap (44) between the side wall of the insert (3) and the side wall of the third blind hole (41).

6. The mold for the aluminum mold-steel mold for embedding fasteners according to claim 5, characterized in that, The second channel (52) comprises a fifth blind hole (521) and a sealing plug (522), the fifth blind hole (521) vertically penetrates the side wall of the insert (3), the middle part of the fifth blind hole (521) is connected to the fourth blind hole (512), and the end of the fifth blind hole (521) towards the outside of the insert (3) is sealed by the sealing plug (522).

7. The mold for the aluminum mold-steel mold for embedding fasteners according to claim 6, characterized in that, The third channel (53) comprises a sixth blind hole (531), the sixth blind hole (531) vertically penetrates the top wall of the insert (3) and extends to the end of the fifth blind hole (521), the diameter of the sixth blind hole (531) is smaller than the diameter of the second blind hole (31), and the depth of the sixth blind hole (531) is greater than the depth of the second blind hole (31).

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