A single-mold dual-cavity aluminum alloy wheel hub mold for low-pressure casting and a mold opening and closing method

Abstract

A single-mold, dual-cavity aluminum alloy wheel hub mold for low-pressure casting and a mold opening and closing method relate to the field of aluminum alloy wheel hub molds for low-pressure casting. The mold includes a bottom mold plate, a left upper mold, a right upper mold, a left lower mold, a right lower mold, six side molds, a front interlockable shared side mold, and a rear interlockable shared side mold. The left lower mold and the right lower mold are arranged side by side on the bottom mold plate. A shared mold installation gap is provided between the left lower mold and the right lower mold. Left guide columns in the shape of a rectangular parallelepiped that cooperate with each other are respectively provided on the left front side and the left rear side of the bottom mold plate. A front interlockable shared side mold and a rear interlockable shared side mold that cooperate with the left lower mold and the right lower mold are respectively provided in the shared mold installation gap between the left lower mold and the right lower mold. The mold opening and closing method is as follows: the front interlockable shared side mold and the rear interlockable shared side mold are closed first when closing the mold and opened later when opening the mold. The present invention has the advantages of simple structure, low cost, and high production efficiency.

Description

Technical Field

[0001] The invention relates to the field of aluminum alloy wheel hub molds for low-pressure casting, and in particular to a single-mold dual-cavity aluminum alloy wheel hub mold for low-pressure casting with simple structure, low cost and high production efficiency, and a mold opening and closing method. Background Art

[0002] As we know, the existing low-pressure casting aluminum alloy wheel mold mainly includes a bottom mold plate and an upper mold, a lower mold and four side molds that cooperate with each other. Four rectangular guide columns are provided on the bottom mold plate (fixed around the lower mold); during casting, the lower mold is fixed on the bottom mold plate, and the four side molds are guided and positioned by the four guide columns and pressed against the four sides of the lower mold by a pressure device. The structure of the four side molds is as follows: a rectangular side mold body is provided, the lower part of the front side surface of the side mold body is provided with an arc-shaped clamping surface that cooperates with the lower mold, and the upper part is provided with an arc-shaped clamping groove that cooperates with the upper mold; a model arc surface (i.e., the inner side surface of the side mold) is provided on the front side surface of the side mold body between the arc-shaped clamping groove and the arc-shaped clamping surface, and the central angle corresponding to the model arc surface on the side mold body is 90°; side mold joint surfaces are respectively provided on the left and right sides of the model arc surface along the radial direction thereof and intersecting with the model arc surface, and the two side mold joint surfaces form an angle of 45° with the left and right sides of the side mold body respectively. The front side surfaces of the side mold bodies of the four side molds are set inward, and can be enclosed into a circumferentially closed circle, forming a complete side mold of the mold. A lower mold is matched with the four side molds on all sides. The arc-shaped snap-fit surfaces at the bottom of the four side molds fit tightly with the four sides of the lower mold. The upper mold and the cover that matches the arc-shaped snap-fit grooves at the top of the four side molds are set on the four side molds. The upper mold, the lower mold and the four side molds enclose the aluminum alloy wheel hub cavity. In order to avoid mold error and aluminum leakage during the low-pressure casting process and to ensure the quality of the wheel hub and the mold strength, the existing aluminum alloy wheel hub mold for low-pressure casting has a one-mold-one-cavity structure. The aluminum alloy wheel hub mold for low-pressure casting with one mold and one cavity has the disadvantages of occupying a large space and low production efficiency. Summary of the Invention

[0003] The purpose of the present invention is to solve the above-mentioned deficiencies in the prior art and to provide a single-mold dual-cavity aluminum alloy wheel hub mold for low-pressure casting that has a simple structure, low cost and high production efficiency.

[0004] A single-mold dual-cavity aluminum alloy wheel hub mold for low-pressure casting, characterized in that it includes a bottom mold plate, a left upper mold, a right upper mold, a left lower mold, a right lower mold, 6 side molds, a front interlockable common side mold and a rear interlockable common side mold, the left lower mold and the right lower mold are arranged side by side on the bottom mold plate, a shared mold installation gap is provided between the left lower mold and the right lower mold, left guide columns in the shape of a rectangular parallelepiped that cooperate with each other are provided on the bottom mold plates on the left front side and the left rear side of the left lower mold, and right guide columns in the shape of a rectangular parallelepiped that cooperate with each other are provided on the bottom mold plates on the right front side and the right rear side of the right lower mold, a side mold is provided between the two left guide columns, and the two right guide columns are provided between the two left guide columns. A side mold is arranged between the left lower mold and the right lower mold, and a front interlockable common side mold and a rear interlockable common side mold that cooperate with the left lower mold and the right lower mold are respectively provided at the shared mold installation gap between the left lower mold and the right lower mold; the structure of the front interlockable common side mold and the rear interlockable common side mold is that they are respectively provided with a front guide positioning block and a rear guide positioning block that cooperate with the left guide column and the right guide column, and the rear side of the front guide positioning block and the front side of the rear guide positioning block are respectively provided with a front wedge-shaped lockable side mold and a rear wedge-shaped lockable side mold that cooperate with each other, and the left and right sides of the lower part of the front wedge-shaped lockable side mold and the lower part of the rear wedge-shaped lockable side mold are respectively provided with The arc-shaped clamping surface that cooperates with the lower mold and the right lower mold; the left and right sides of the upper part of the front wedge-shaped lockable side mold and the upper part of the rear wedge-shaped lockable side mold are respectively provided with arc-shaped clamping grooves that cooperate with the left upper mold and the right upper mold; the rear side of the front wedge-shaped lockable side mold and the front side of the rear wedge-shaped lockable side mold are provided with fitting surfaces that fit tightly with each other; the left and right sides of the front wedge-shaped lockable side mold and the rear wedge-shaped lockable side mold are respectively provided with model arc surfaces that match the inner side surfaces of the side molds, and the front sides of the front wedge-shaped lockable side molds on the left and right sides of the front guide positioning block are respectively provided with front side mold joint surfaces that fit and connect with the side molds; the rear wedge-shaped lockable side molds on the left and right sides of the rear guide positioning block are respectively provided with front side mold joint surfaces that fit and connect with the side molds. The rear side of the mold is respectively provided with a rear side mold joint surface that cooperates and fits with the side mold; a side mold is arranged between the left guide column on the front of the bottom mold plate and the front guide positioning block, a side mold is arranged between the left guide column on the rear of the bottom mold plate and the rear guide positioning block, a side mold is arranged between the right guide column on the front of the bottom mold plate and the front guide positioning block, and a side mold is arranged between the right guide column on the rear of the bottom mold plate and the rear guide positioning block; the upper left mold cover is arranged on the upper side of the three side molds on the left side and the front interlockable common side mold and the rear interlockable common side mold, and the upper right mold cover is arranged on the upper side of the three side molds on the right side and the front interlockable common side mold and the rear interlockable common side mold.

[0005] The side mold structure described in the present invention comprises a rectangular side mold body, the front side of which is provided with an arc-shaped engaging surface for engaging with the lower mold at the lower portion, and an arc-shaped engaging groove for engaging with the upper mold at the upper portion. A model arc surface is provided on the front side of the side mold body between the arc-shaped engaging groove and the arc-shaped engaging surface, and the central angle corresponding to the model arc surface on the side mold body is 90°. The side mold bodies on the left and right sides of the model arc surface are provided with side mold engaging surfaces arranged along the radial direction thereof. The front side surfaces of the side mold bodies of the four side molds are arranged inward to form a circumferentially closed circle, forming a side mold of a mold. A lower mold is surrounded by the four side molds, and the arc-shaped engaging surfaces on the lower portions of the four side molds are tightly fitted to the periphery of the lower mold. An upper mold, which is provided with a cover that engages with the arc-shaped engaging grooves on the upper portions of the four side molds, forms a low-pressure casting aluminum alloy wheel hub mold according to the prior art. The upper left mold and the upper right mold in the present invention have the same structure as the upper mold in the prior art, the lower left mold and the lower right mold have the same structure as the lower mold in the prior art, and the six side molds have the same structure as the side molds in the prior art. They are improved on the basis of the existing structure and save mold opening costs.

[0006] In the present invention, the rear side surface of the side mold between the left guide column and the front guide positioning block on the front part of the bottom template, the rear side surface of the side mold between the right guide column and the front guide positioning block on the front part of the bottom template, and the front side surface of the front guide positioning block are located in the same plane, and the rear side surface of the side mold between the left guide column and the rear guide positioning block on the rear part of the bottom template, the rear side surface of the side mold between the right guide column and the rear guide positioning block on the rear part of the bottom template, and the rear side surface of the rear guide positioning block are located in the same plane.

[0007] The U-shaped clamping slot is formed on the upper surface of the clamping plate, and the upper surface of the clamping plate is provided with a clamping slot that is open at the upper end thereof. The clamping slot is formed on the upper surface of the clamping plate, and the clamping slot is provided on the upper surface thereof. The clamping slot is formed on the lower surface of the clamping plate, and the clamping slot is provided on the upper surface thereof. When the side mold deviates from the left and right guide posts, front and rear guide blocks during the initial mold closing process, the corresponding guides automatically correct the direction to avoid mold misalignment and aluminum leakage. A first-in, last-out mold opening and closing power device is installed on the front side of the front guide block and the back side of the rear guide block.

[0008] The above the clamping slide groove of the present invention is provided with an insertion slide hole connected thereto.

[0009] The first-in, last-out mold opening and closing power device described in the present invention comprises: spring mounting slots are respectively provided on the front side of the front guide positioning block and the rear side of the rear guide positioning block, and power springs are respectively provided in the spring mounting slots to connect the front guide positioning block and the rear guide positioning block to the pressurized front push plate and the pressurized rear push plate, respectively. When closing the mold, the pressurized front push plate is pushed backward and the pressurized rear push plate is pushed forward, and the power springs drive the front guide positioning block and the rear guide positioning block to move backward and forward relative to each other, respectively, until the mating surfaces of the front wedge-shaped lockable side mold and the rear wedge-shaped lockable side mold are in contact with each other. Then, the left and right side molds (cooperating with the front guide positioning block) move backward under the guidance of the front guide positioning block and the left and right guide posts, and the left and right side molds (cooperating with the rear guide positioning block) move forward under the guidance of the rear guide positioning block and the left and right guide posts. After the mating surfaces of the front and rear wedge-shaped lockable side molds mate, the curved engagement surfaces of the lower portions of the front and rear wedge-shaped lockable side molds engage with the left and right lower molds, being squeezed and secured within the shared mold installation gap between them. The front and rear guide locating blocks are secured to the bottom mold plate. The front and rear interlockable shared side molds, while functioning as shared side molds, also guide and position the side molds that are subsequently closed. After mold closing, the power spring is fully compressed within the spring installation slot. When opening the mold, pull the pressurized front push plate forward and pull the pressurized rear push plate backward. Since the power spring is in a compressed state, the front interlocking common side mold and the rear interlocking common side mold are in a stationary state, and the side molds on the left and right sides of the front guide positioning block are pulled forward and the side molds on the left and right sides of the rear guide positioning block are pulled backward. When the power spring is stretched, the front interlocking common side mold and the rear interlocking common side mold will be pulled forward and backward by sufficient tension of the power spring to complete the mold opening.

[0010] The first-in, last-out mold opening and closing power device described in the present invention is: a connecting slot is respectively provided on the pressurized front push plate and the pressurized rear push plate, and an opening and closing pin is provided in the connecting slot, which can slide freely axially and has a front end connected to the front side of the front guide positioning block and the rear side of the rear guide positioning block respectively.

[0011] The connecting notch described in the present invention is elongated, and the opening and closing pin can slide freely axially and vertically within the connecting notch. The front guide positioning block and the rear guide positioning block are each provided with a snap-fitting connecting groove. The front portion of the snap-fitting connecting groove of the front guide positioning block is provided with a U-shaped front snap-fitting plate with an open upper side, while the rear portion of the snap-fitting connecting groove of the rear guide positioning block is provided with a U-shaped rear snap-fitting plate with an open upper side. The front end of the opening and closing pin is provided with an annular snap-fitting groove that mates with the U-shaped front snap-fitting plate. The front end of the opening and closing pin can pass through the connecting notch and extend into the snap-fitting connecting groove. The opening and closing pin then slides downward, and the annular snap-fitting groove at the front end snaps into the U-shaped front snap-fitting plate. This facilitates processing, preparation, transportation, and storage.

[0012] The base template of the present invention is provided with dovetail guide slots opposite the front and rear guide blocks. Dovetail guide blocks are provided below the front and rear guide blocks to mate with the dovetail guide slots. The dovetail guide blocks and dovetail guide slots ensure that the front and rear guide blocks can only move forward and backward, resulting in better positioning and guiding effects.

[0013] In the present invention, the front side, rear side, left side and right side of the side mold are the names of the side surfaces of the side mold defined relative to the surface where the model arc surface is located on the side mold, and have nothing to do with the front, back, left and right directions of the present invention; the side surface of the side mold with the model arc surface is the front side.

[0014] A method for opening and closing a single-mold, dual-cavity aluminum alloy wheel hub mold for low-pressure casting, wherein a left lower mold and a right lower mold are fixed on a bottom mold plate. The method is characterized in that: when closing the mold, a front interlockable common side mold and a rear interlockable common side mold are first connected to the left lower mold and the right lower mold, then the six side molds are closed, and finally the left upper mold and the right upper mold are closed; when opening the mold, the left upper mold and the right upper mold are first opened, then the six side molds are opened, then the front interlockable common side mold and the rear interlockable common side mold are opened, and finally the left lower mold and the right lower mold are opened.

[0015] When using the present invention, the left and right lower molds are first fixed to the bottom mold plate. The front interlockable shared side mold and the rear interlockable shared side mold are then connected to the left and right lower molds for mold closing. The arcuate clamping surfaces of the lower portions of the front wedge-shaped lockable side mold and the rear wedge-shaped lockable side mold cooperate with the left and right lower molds and are squeezed and fixed in the shared mold installation gap between the left and right lower molds. The front guide positioning blocks and the rear guide positioning blocks are fixed to the bottom mold plate. The six side molds are precisely closed under the guidance of the left guide column, the right guide column, the front guide positioning blocks, and the rear guide positioning blocks. Finally, the left and right upper molds are closed. The present invention has the advantages of simple structure, low cost, small footprint, and high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the explosion structure of the present invention.

[0017] Figure 2 It is a structural diagram of the cooperation relationship of the bottom template, the left lower mold, the right lower mold, the rear interlockable common side mold, the two side molds, the pressurized rear push plate and the two connecting pins of the present invention.

[0018] Figure 3 It is a schematic diagram of the cooperation structure between the midsole template, the rear interlocking common side template and the pressurized rear push plate of the present invention.

[0019] Figure 4 It is a structural schematic diagram of the side mold in the present invention.

[0020] Figure 5 This is a schematic diagram of another matching structure between the midsole template, the rear interlocking common side template and the pressurized rear push plate of the present invention. DETAILED DESCRIPTION

[0021] like Figure 1-4The low-pressure casting single-mold dual-cavity aluminum alloy wheel hub mold shown in the figure includes a bottom mold plate 1, a left upper mold plate 4, a right upper mold plate 9, a left lower mold plate 3, a right lower mold plate 8, 6 side molds, a front interlocking common side mold and a rear interlocking common side mold. The structure and function of the left upper mold plate 4, the right upper mold plate 9, the left lower mold plate 3, the right lower mold plate 8 and the 6 side molds are the same as those in the prior art. The characteristics of the present invention are: a left lower mold mounting groove and a right lower mold mounting groove are provided in parallel on the bottom mold plate 1, the left lower mold plate 3 and the right lower mold plate 8 are fixedly arranged in the left lower mold mounting groove and the right lower mold mounting groove on the mold plate, and the left lower mold plate 3 and the right lower mold plate 8 are fixedly arranged in parallel in the left lower mold mounting groove and the right lower mold mounting groove on the mold plate. A shared mold installation gap is provided between the two molds. The left front and left rear bottom mold plates of the left lower mold 3 are each provided with a mutually cooperating (one side facing) rectangular parallelepiped left guide post 2. A side mold is provided between the two left guide posts. The two left guide posts 2 cooperate with each other to guide and position the side mold between them during the mold closing process. The right front and right rear bottom mold plates of the right lower mold 8 are each provided with a mutually cooperating (one side facing) rectangular parallelepiped right guide post 10. A side mold is provided between the two right guide posts 10. The two right guide posts cooperate with each other to guide and position the side mold between them during the mold closing process. The shared mold installation gap between the left lower mold 3 and the right lower mold 8 is provided with a front interlocking shared side mold and a rear interlocking shared side mold that cooperate with the left and right lower molds, respectively. The front and rear interlocking shared side molds are structured as follows: front and rear guide positioning blocks 7 are provided to correspond with the left and right guide posts 2 and 10, respectively.The front guide positioning block and the rear guide positioning block 7 are rectangular blocks, one side of which is parallel to the corresponding left guide column 2 and the other side is parallel to the corresponding right guide column 10. The rear side of the front guide positioning block and the front side of the rear guide positioning block 7 are respectively provided with a wedge-shaped front wedge-shaped lockable side mold 5 and a rear wedge-shaped lockable side mold 6 that cooperate with each other. The left and right sides of the lower part of the front wedge-shaped lockable side mold 5 and the lower part of the rear wedge-shaped lockable side mold 6 are respectively provided with arc-shaped clamping surfaces that cooperate with the left lower mold 3 and the right lower mold 8. The lower part of the front wedge-shaped lockable side mold 5 and the lower part of the rear wedge-shaped lockable side mold 6 are fitted with the arc side surfaces of the left lower mold 3 and the right lower mold 8 and are squeezed and fixed in the shared mold installation gap between the left lower mold and the right lower mold; the upper part of the front wedge-shaped lockable side mold 5 and the upper part of the rear wedge-shaped lockable side mold 6 are respectively provided with a stepped arc-shaped clamping groove 16 that cooperates with the left upper mold 4 and the right upper mold 9. The arc-shaped snap-fitting grooves 16 on the tight side mold 5 and the rear wedge-shaped lockable side mold 6 cooperate with the arc-shaped snap-fitting grooves on the upper part of the side mold to form circular snap-fitting grooves for positioning and installing the left upper mold 4 and the right upper mold 9; the rear side of the front wedge-shaped lockable side mold 5 and the front side of the rear wedge-shaped lockable side mold 6 are provided with fitting surfaces that fit tightly with each other; the arc-shaped snap-fitting grooves 16 on the left and right sides of the front wedge-shaped lockable side mold 5 and the rear wedge-shaped lockable side mold 6 and the arc-shaped snap-fitting surfaces are respectively provided with fitting surfaces that fit with the inner side surfaces of the side molds The combined model arc surface 15, the radial convex and concave shape of the model arc surface 15 is the same as the radial convex and concave shape of the inner surface of the side mold, and the central angle corresponding to the model arc surface 15 of the front wedge-shaped lockable side mold 5 and the rear wedge-shaped lockable side mold 6 is 45°; the two model arc surfaces on the left or right side of the front wedge-shaped lockable side mold and the rear wedge-shaped lockable side mold and the three side mold inner surfaces that match them together form the inner surface of a complete side mold of an aluminum alloy wheel hub mold. The front sides of the front wedge-shaped lockable side molds 5 on the left and right sides of the front guide positioning block are respectively provided with front side mold joint surfaces that are fitted and connected to the side mold joint surfaces 23 of the side mold; the rear sides of the rear wedge-shaped lockable side molds 6 on the left and right sides of the rear guide positioning block 7 are respectively provided with rear side mold joint surfaces 22 that are fitted and connected to the side mold joint surfaces 23 of the side mold; a side mold is arranged between the left guide column 2 on the front of the bottom mold plate 1 and the front guide positioning block, a side mold is arranged between the left guide column on the rear of the bottom mold plate 1 and the rear guide positioning block 7, a side mold is arranged between the right guide column on the front of the bottom mold plate and the front guide positioning block, and a side mold is arranged between the right guide column 10 on the rear of the bottom mold plate and the rear guide positioning block 7; the left upper mold 4 is covered on the space enclosed by the three side molds on the left side and the front interlockable common side mold 5 and the rear interlockable common side mold 6, and the right upper mold is covered on the space enclosed by the three side molds on the right side and the front interlockable common side mold and the rear interlockable common side mold.

[0022] In the present invention, the rear side surface of the side mold between the left guide column and the front guide positioning block on the front of the bottom template 1, the rear side surface of the side mold between the right guide column and the front guide positioning block on the front of the bottom template, and the front side surface of the front guide positioning block are located in the same plane, and the rear side surface of the side mold between the left guide column and the rear guide positioning block on the rear of the bottom template, the rear side surface of the side mold between the right guide column and the rear guide positioning block on the rear of the bottom template, and the rear side surface of the rear guide positioning block 7 are located in the same plane. The front and rear parts of the bottom template are respectively provided with a pressurized front push plate and a pressurized rear push plate 12, the pressurized front push plate is located at the front side of the front guide positioning block and its left and right side molds that cooperate with it, and the pressurized rear push plate 12 is located at the rear side of the rear guide positioning block 7 and its left and right side molds that cooperate with it; a connecting groove 25 is provided on the rear side surface of the side mold, and a clamping plate 24 is provided in the connecting groove 25, and a U-shaped clamping groove 26 with an open upper end is provided on the upper side of the clamping plate 24; a clamping slide 21 is provided on the pressurized front push plate and the pressurized rear push plate 12 at a position opposite to the U-shaped clamping groove 26, and an insertion slide hole 20 connected to it is provided on the pressurized front push plate and the pressurized rear push plate 12 above the clamping slide 21; a connecting pin 11 is provided in the U-shaped clamping groove 26 and the clamping slide 21, and the front end of the connecting pin 11 on the inner side of the U-shaped clamping groove 26 (near the front side of the side mold) is provided The front baffle plate 18 of mold opening and the rear part of the connecting pin 11 of the outer side of the clamping slide 21 (the front side of the pressurized front push plate and the rear side of the pressurized rear push plate 12) are provided with a rear baffle plate 19 for mold opening. The diameter of the connecting pin 11 is smaller than the width of the U-shaped clamping slot. Usually, the diameter of the connecting pin is 0.9-0.96 times the width of the U-shaped clamping slot (the widest point). The side mold can swing freely left and right at a small angle (within 5°, usually 1-2 degrees) on the connecting pin 11. The diameter of the front baffle plate 18 of mold opening is larger than the width of the clamping slide 21 and the U-shaped clamping slot 26 and smaller than the diameter of the insertion slide hole 20. The front baffle plate 18 of mold opening can be inserted into the connecting groove 25 on the upper side of the U-shaped clamping slot 26 through the insertion slide hole 20, and then slide down into the U-shaped clamping slot 26 and the clamping slide 21; the diameter of the rear baffle plate 19 of mold opening is larger than the diameter of the insertion slide hole 20 and the width of the clamping slide 21. The distance between the front baffle plate 18 and the rear baffle plate 19 is slightly larger than the sum of the thicknesses of the clamping plate 24 and the pressurized rear push plate 12. The distance between the front baffle plate 18 and the rear baffle plate 19 is 1.01-1.3 times the sum of the thicknesses of the clamping plate 24 and the pressurized rear push plate 12, and is usually 1.05-1.1 times. The thickness of the pressurized rear push plate is the same as that of the pressurized front push plate. When the side mold is misaligned with the left guide column 2, the right guide column 10, the front guide positioning block, and the rear guide positioning block 7 at the initial stage of mold closing, the direction can be automatically corrected under the corresponding guiding action to avoid mold misalignment and aluminum leakage. The front side of the front guide positioning block and the rear side of the rear guide positioning block are respectively provided with a first-in, last-out mold opening and closing power device.The first-in, last-out mold opening and closing power device is as follows: a spring mounting groove is provided on the front side of the front guide positioning block and the rear side of the rear guide positioning block 7, and a power spring 17 is provided in each spring mounting groove to elastically connect the front guide positioning block and the rear guide positioning block 7 to the pressurized front push plate and the pressurized rear push plate 12, respectively. When closing the mold, the pressurized front push plate is pushed backward and the pressurized rear push plate is pushed forward, and the respective power springs 17 respectively drive the front guide positioning block and the rear guide positioning block 7 to move backward and forward relative to each other until the contact surfaces of the front wedge-shaped lockable side mold 5 and the rear wedge-shaped lockable side mold 6 are in contact with each other. Then, the left and right side molds of the front guide positioning block move backward under the guidance of the front guide positioning block and the front left guide column and the right guide column, and the left and right side molds of the rear guide positioning block move forward under the guidance of the rear guide positioning block 7 and the rear left guide column and the right guide column. After the mating surfaces of the front and rear wedge-shaped lockable side molds are in contact with each other, the arcuate engaging surfaces of the lower portions of the front and rear wedge-shaped lockable side molds engage with the left and right lower molds and are squeezed and fixed within the shared mold installation gap between the left and right lower molds. The front and rear guide positioning blocks are fixed to the bottom mold plate in the front, rear, left, and right directions. The front and rear interlockable shared side molds, while functioning as shared side molds, also guide and position the side molds that are subsequently closed. After mold closing is complete, the power spring 17 is fully compressed within the spring installation slot. When opening the mold, pull the pressurized front push plate forward and pull the pressurized rear push plate backward. Since the power spring is in a compressed state, the front interlockable common side mold and the rear interlockable common side mold are in a stationary state, and the side molds on the left and right sides of the front guide positioning block are pulled forward and the side molds on the left and right sides of the rear guide positioning block are pulled backward. When the power spring 17 is stretched, the front interlockable common side mold and the rear interlockable common side mold will be pulled forward and backward by sufficient tension of the power spring 17 to complete the mold opening.

[0023] The first-in, last-out mold opening and closing power device described in the present invention can also be: a connecting notch 28 is respectively provided on the pressurized front push plate and the pressurized rear push plate, and an opening and closing pin 30 is provided in the connecting notch 28, which can slide freely in the axial direction and has its front end connected to the front side of the front guide positioning block and the rear side of the rear guide positioning block 7 respectively. The connecting notch 28 is in the shape of an elongated strip, and the opening and closing pin 30 can slide freely in the axial direction and slide up and down in the connecting notch 28; a snap-fitting groove 26 is respectively provided on the front side of the front guide positioning block and the rear side of the rear guide positioning block 7, the front portion of the snap-fitting groove of the front guide positioning block is provided with a U-shaped front snap-fitting plate with an upper side open, and the rear portion of the snap-fitting groove 26 of the rear guide positioning block 7 is provided with a U-shaped rear snap-fitting plate 27 with an upper side open, and the front end of the opening and closing pin 30 is provided with an annular snap-fitting groove 29 that cooperates with the U-shaped front snap-fitting plate or the U-shaped rear snap-fitting plate 27. The front end of the opening and closing pin can pass through the connecting notch and extend into the snap-fit connection groove. The opening and closing pin then slides downward, and the annular snap-fit groove at the front end snaps into the U-shaped front snap-fit plate or the U-shaped rear snap-fit plate. During mold opening and closing operations, the opening and closing pin can independently control the opening and closing times of the front interlocking shared side mold and the rear interlocking shared side mold. The structure is simple, easy to manufacture, and facilitates processing, preparation, transportation, and storage.

[0024] The present invention further improves upon this by providing dovetail-shaped guide slots 14 (disposed in the front-to-back direction) on the bottom mold plate opposite the front and rear guide blocks. Dovetail-shaped guide blocks that cooperate with dovetail-shaped guide slots 14 are provided below the front and rear guide blocks. The dovetail-shaped guide blocks cooperate with dovetail-shaped guide slots 14 to limit the front and rear guide blocks to forward and backward sliding motions, preventing them from moving up and down, left and right, or rotating. This, in conjunction with the curved side molds of the left and right lower molds, restricts the positions of the front and rear guide blocks, resulting in enhanced positioning and guiding effects.

[0025] The side mold structure described in the present invention comprises a rectangular parallelepiped side mold body 13. The lower portion of the front side of the side mold body 13 is provided with an arcuate engaging surface for engaging with the lower mold (lower left or lower right mold), and the upper portion is provided with an arcuate engaging groove for engaging with the upper mold (upper left or upper right mold). A model arcuate surface (i.e., the inner side surface of the side mold) is provided on the front side of the side mold body between the arcuate engaging groove and the arcuate engaging surface. The central angle corresponding to the model arcuate surface on the side mold body is 90°. Side mold engaging surfaces 23 are provided on the left and right sides of the model arcuate surface, radially extending along the side mold body (intersecting the model arcuate surface). The two side mold engaging surfaces form a 45° angle with the left and right sides of the side mold body, respectively. The front sides of the four side mold bodies are arranged inward, forming a circumferentially closed circle, forming a complete side mold portion of a mold set. A lower mold is surrounded by four side molds. The curved engaging surfaces at the bottom of the four side molds fit tightly around the lower mold. An upper mold, which is fitted with curved engaging grooves at the top of the four side molds, is mounted on the four side molds, forming a conventional low-pressure casting aluminum alloy wheel mold. The left and right upper molds of the present invention have the same structure as the conventional upper molds, the left and right lower molds have the same structure as the conventional lower molds, and the six side molds have the same structure as the conventional side molds. This improves upon the existing structure and reduces mold opening costs.

[0026] In the present invention, the front side, rear side, left side and right side of the side mold are the names of the side surfaces of the side mold defined relative to the surface where the model arc surface is located on the side mold, and have nothing to do with the front, back, left and right directions of the present invention; the side surface of the side mold with the model arc surface is the front side.

[0027] The above-mentioned low-pressure casting single-mold double-cavity aluminum alloy wheel hub mold opening and closing method fixes the lower left mold and the lower right mold on the bottom mold plate. When closing the mold, first connect the front interlocking common side mold and the rear interlocking common side mold to the lower left mold and the lower right mold, then close the six side molds, and finally close the upper left mold and the upper right mold; when opening the mold, first open the upper left mold and the upper right mold, then open the six side molds, then open the front interlocking common side mold and the rear interlocking common side mold, and finally open the lower left mold and the lower right mold.

[0028] When the present invention is used, the left lower mold and the right lower mold are first fixed on the bottom mold plate, and then the front interlockable shared side mold and the rear interlockable shared side mold are connected to the left lower mold and the right lower mold for mold closing. The arc-shaped clamping surfaces of the lower parts of the front wedge-shaped lockable side mold and the rear wedge-shaped lockable side mold cooperate with the left lower mold and the right lower mold and are squeezed and fixed in the shared mold installation gap between the left lower mold and the right lower mold. The front guide positioning block and the rear guide positioning block are fixed on the bottom mold plate; the six side molds are respectively precisely closed under the mutual guidance of the left guide column, the right guide column, the front guide positioning block and the rear guide positioning block, and finally the left upper mold and the right upper mold are closed. The present invention has the advantages of simple structure, low cost, small site area, high production efficiency, precise closing of the side molds, the front interlockable shared side mold and the rear interlockable shared side mold, and is not easy to cause aluminum to escape due to mold error.

Claims

1. A low-pressure casting double-cavity aluminum alloy wheel mold, characterized in that It includes a bottom template, an upper left template, an upper right template, a lower left template, a lower right template, 6 side templates, a front interlockable common side template and a rear interlockable common side template. The lower left template and the lower right template are arranged side by side on the bottom template. A shared template installation gap is provided between the lower left template and the lower right template. Left guide columns in the shape of a rectangular parallelepiped that cooperate with each other are provided on the left front side and the left rear side of the bottom template of the lower left template. Right guide columns in the shape of a rectangular parallelepiped that cooperate with each other are provided on the right front side and the right rear side of the bottom template of the lower right template. A side template is provided between the two left guide columns, and a side template is provided between the two right guide columns. A front interlockable common side template and a rear interlockable common side template that cooperate with the lower left template and the lower right template are provided at the shared template installation gap between the lower left template and the lower right template. Locking common side mold; the structure of the front interlockable common side mold and the rear interlockable common side mold is: respectively provided with a front guide positioning block and a rear guide positioning block that cooperate with the left guide column and the right guide column, the rear side of the front guide positioning block and the front side of the rear guide positioning block are respectively provided with a front wedge-shaped lockable side mold and a rear wedge-shaped lockable side mold that cooperate with each other, the left and right sides of the lower part of the front wedge-shaped lockable side mold and the lower part of the rear wedge-shaped lockable side mold are respectively provided with arc-shaped clamping surfaces that cooperate with the left lower mold and the right lower mold; the left and right sides of the upper part of the front wedge-shaped lockable side mold and the upper part of the rear wedge-shaped lockable side mold are respectively provided with arc-shaped clamping grooves that cooperate with the left upper mold and the right upper mold; the rear side of the front wedge-shaped lockable side mold and the front side of the rear wedge-shaped lockable side mold are respectively provided The left and right sides of the front wedge-shaped lockable side molds and the rear wedge-shaped lockable side molds are respectively provided with model arc surfaces that match the inner sides of the side molds, and the front sides of the front wedge-shaped lockable side molds on the left and right sides of the front guide positioning block are respectively provided with front side mold joint surfaces that fit and connect with the side molds; the rear sides of the rear wedge-shaped lockable side molds on the left and right sides of the rear guide positioning block are respectively provided with rear side mold joint surfaces that fit and connect with the side molds; a side mold is arranged between the left guide column on the front of the bottom mold plate and the front guide positioning block, a side mold is arranged between the left guide column on the rear of the bottom mold plate and the rear guide positioning block, a side mold is arranged between the right guide column on the front of the bottom mold plate and the front guide positioning block, and the right guide column on the rear of the bottom mold plate and the rear guide A side mold is set between the positioning blocks; the left upper mold cover is set on the upper sides of the three side molds on the left and the front interlockable common side mold and the rear interlockable common side mold, and the right upper mold cover is set on the upper sides of the three side molds on the right and the front interlockable common side mold and the rear interlockable common side mold; the structure of the side mold is: a side mold body in the shape of a rectangular parallelepiped is provided, the lower part of the front side surface of the side mold body is provided with an arc-shaped clamping surface that cooperates with the lower mold, and the upper part is provided with an arc-shaped clamping groove that cooperates with the upper mold, a model arc surface is provided on the front side surface of the side mold body between the arc-shaped clamping groove and the arc-shaped clamping surface, and the central angle corresponding to the model arc surface on the side mold body is 90°; the side mold bodies on the left and right sides of the model arc surface are respectively provided with side mold joint surfaces arranged along the radial direction thereof;The rear side of the side mold between the left guide post and the front guide positioning block on the front of the bottom template, the rear side of the side mold between the right guide post and the front guide positioning block on the front of the bottom template, and the front side of the front guide positioning block are located in the same plane. The rear side of the side mold between the left guide post and the rear guide positioning block on the rear of the bottom template, and the rear side of the side mold between the right guide post and the rear guide positioning block on the rear of the bottom template, and the rear side of the rear guide positioning block are located in the same plane.

2. The low pressure casting double-cavity aluminum alloy wheel hub mold according to claim 1, characterized in that The front and rear parts of the bottom template are respectively provided with a pressurized front push plate and a pressurized rear push plate. The pressurized front push plate is located in front of the front guide positioning block and its left and right side molds, and the pressurized rear push plate is located in the rear side of the rear guide positioning block and its left and right side molds; a connecting groove is provided on the rear side surface of the side mold, a clamping plate is provided in the connecting groove, and a U-shaped clamping groove with an open upper end is provided on the upper side of the clamping plate; a clamping slide is provided on the pressurized front push plate and the pressurized rear push plate at the position opposite to the U-shaped clamping groove ; Connecting pins are provided in the U-shaped clamping groove and the clamping slide, and the front end of the connecting pin on the inside of the U-shaped clamping groove is provided with a front mold opening baffle, and the rear part of the connecting pin on the outside of the clamping slide is provided with a rear mold opening baffle. The diameter of the connecting pin is smaller than the width of the U-shaped clamping groove, and the distance between the front mold opening baffle and the rear mold opening baffle is slightly larger than the sum of the thicknesses of the clamping plate and the pressurized front push plate; the front side of the front guide positioning block and the rear side of the rear guide positioning block are respectively provided with a first-in and last-out mold opening and closing power device.

3. The low pressure casting double-cavity aluminum alloy wheel hub mold according to claim 2, characterized in that The first-in, last-out mold opening and closing power device is as follows: spring mounting grooves are respectively provided on the front side of the front guide positioning block and the rear side of the rear guide positioning block, and power springs are respectively provided in the spring mounting grooves to connect the front guide positioning block and the rear guide positioning block with the pressurized front push plate and the pressurized rear push plate.

4. The low pressure casting double-cavity aluminum alloy wheel hub mold according to claim 2, characterized in that The first-in, last-out mold opening and closing power device is as follows: the pressurized front push plate and the pressurized rear push plate are respectively provided with connecting slots, and the connecting slots are provided with opening and closing pins that can slide freely axially and whose front ends are respectively connected to the front side of the front guide positioning block and the rear side of the rear guide positioning block.

5. The low pressure casting double-cavity aluminum alloy wheel hub mold according to claim 4, characterized in that The connecting groove is in the shape of a long strip, and the opening and closing pin can slide freely axially and up and down in the connecting groove; the front side of the front guide positioning block and the rear side of the rear guide positioning block are respectively provided with a snap connection groove, the front part of the snap connection groove of the front guide positioning block is provided with a U-shaped front snap-in plate with an open upper side, and the rear part of the snap connection groove of the rear guide positioning block is provided with a U-shaped rear snap-in plate with an open upper side, and the front end part of the opening and closing pin is provided with an annular snap-in groove that cooperates with the U-shaped front snap-in plate.

6. The low pressure casting double-cavity aluminum alloy wheel hub mold according to claim 5, characterized in that The bottom template is provided with dovetail guide slots at positions opposite to the front guide positioning block and the rear guide positioning block, and dovetail guide blocks matching the dovetail guide slots are provided at the lower parts of the front guide positioning block and the rear guide positioning block.

7. A method for opening and closing a mold for a single-mold dual-cavity aluminum alloy wheel hub for low-pressure casting according to claim 1, characterized in that: When closing the mold, fix the lower left mold and the lower right mold on the bottom mold plate, then connect the front interlocking common side mold and the rear interlocking common side mold to the lower left mold and the lower right mold, then close the 6 side molds, and finally close the upper left mold and the upper right mold; when opening the mold, open the upper left mold and the upper right mold first, then open the 6 side molds, then open the front interlocking common side mold and the rear interlocking common side mold, and finally open the lower left mold and the lower right mold.

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