Powder Metallurgy Equipment and Manufacturing Method for the Housing Sprocket in the VVT System

Abstract

The present invention relates to the technical field of powder metallurgy, and discloses a powder metallurgy device and a manufacturing method for a housing sprocket in a VVT system, comprising a main machine, a workbench installed on the main machine, and an upper mold, wherein the workbench is provided with an installation groove, and a lower mold is installed in the installation groove. The present invention sets the lower mold as a mold groove, a movable mandrel, and an annular bottom mold, and then sets a demoulding component, which can respectively drive the mandrel and the annular bottom mold to move and push the pressed blank to the top of the lower mold, thereby achieving fast and stable demoulding, which is beneficial for processing special housing sprockets with a risk of getting stuck. At the same time, by setting a blanking component, the blank is first lifted and then transferred by angle steel during operation of the blanking component, which is beneficial for realizing automated blanking work, and compared with the prior art, the blank is prevented from sliding on the workbench, thereby avoiding the loss and lifting of powder, saving costs, and being safer and more environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the technical field of powder metallurgy, and particularly to a powder metallurgy device and a manufacturing method for a housing sprocket in a VVT system. Background Art

[0002] Powder metallurgy technology is commonly used in the production of metal parts. Its principle is to inject metal powder into the lower die, and then use a press to drive the upper die to apply pressure to form a blank. After that, the blank is heat-treated to improve its properties, and finally, the workpiece is subjected to subsequent finishing to form a finished product. Powder metallurgy technology has the advantages of high raw material utilization rate, high performance, and a wide range of applicable materials. VVT refers to variable valve timing in the automotive field, which is a technology that optimizes the intake and exhaust efficiency by adjusting the opening and closing timing of the engine valves. The VVT sprocket is the core mechanical component of the VVT system, responsible for actually adjusting the rotation angle of the camshaft, thereby changing the opening and closing timing of the valves.

[0003] However, there are also certain problems in the actual production of powder metallurgy technology: such as Figure 2 As shown in a VVT sprocket, the main structure of the sprocket includes a housing 8, a tooth block 9 with a thickness less than that of the housing 8, and a special-shaped stop block 10 inside the housing 8. Among them, a groove 11 is provided on the side wall of the special-shaped stop block 10. After the workpiece is pressed and formed, the workpiece will form an engaging relationship with the mold, and the existing pushing method is difficult to achieve demolding and difficult to meet the processing requirements. Secondly, for the blanking of this type of part at present, generally, the part is directly pushed onto the blanking plate and then slides off. In this way, when the part moves on the workbench, it will push and adhere to a part of the raw material powder, resulting in the loss of the raw material powder, increasing the cost. At this time, the raw material powder is also easy to float, resulting in a reduction in the air quality of the production area and endangering the health of the staff. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a powder metallurgy device and a manufacturing method for a housing sprocket in a VVT system, which have the advantages of convenient demolding, reduced raw material loss, etc., and solve the problems that in the production of sprockets by the existing powder metallurgy technology, the mold is easily engaged with the workpiece, resulting in difficult demolding, and the pushing blanking method leads to raw material powder loss.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: A powder metallurgy device includes a main machine, a workbench installed on the main machine, and an upper die. An installation groove is provided on the workbench, and a lower die is installed in the installation groove. The lower die further includes a die cavity, a core shaft provided in the die cavity, and an annular bottom die sleeved on the core shaft. A convex block is provided on the side wall of the core shaft;

[0006] A demolding assembly is further provided in the installation groove. The demolding assembly is used to drive the mandrel to rotate, and is also used to drive the annular bottom mold to move vertically and rotate;

[0007] A blanking assembly is arranged on the workbench. The blanking assembly includes angle steels that can move vertically and move in the blanking direction. The angle steels are arranged in two and are symmetrically distributed;

[0008] After the raw material is injected into the mold cavity, the upper mold moves down to press the raw material. After being pressed and formed, the demolding assembly operates. First, it drives the annular bottom mold to move down to separate from the workpiece and then rotate a certain angle. Then, it drives the mandrel to rotate. Then, it drives the annular bottom mold to move up, thereby demolding the workpiece. After demolding, the blanking assembly operates, driving the two angle steels to move in the blanking direction and move vertically at the same time, lifting the workpiece and placing it at the blanking position.

[0009] Preferably, the top surface of the lower mold is flush with the surface of the workbench. The mold cavity penetrates through the lower mold and is internally connected to the installation groove. The side wall at the top end of the mold cavity is provided with a tooth groove. The outer diameter of the mandrel is the same as the inner diameter of the annular bottom mold. The bottom end of the mandrel extends into the installation groove and is rotatably connected to the bottom wall of the installation groove. A support rod is fixedly installed at the bottom of the annular bottom mold. The bottom end of the support rod extends into the installation groove and is fixed with a collar. The collar is connected to the bottom wall of the installation groove through the demolding assembly.

[0010] Preferably, the demolding assembly includes an installation frame fixed to the bottom wall of the installation groove. A main adjustment motor is fixed on the installation frame. A first gear is fixed to the output shaft of the main adjustment motor. A second gear is fixedly sleeved at the bottom end of the mandrel. The second gear meshes with the first gear.

[0011] Preferably, the demolding assembly further includes a support plate located at the bottom of the collar. The collar is rotatably connected to the support plate. A plurality of hydraulic cylinders are provided at the bottom of the support plate. Two ends of the hydraulic cylinders are respectively fixed to the bottom wall of the installation groove and the support plate. A secondary adjustment motor is fixed to the edge of the support plate. A third gear is fixed to the output shaft of the secondary adjustment motor. A fourth gear is fixedly sleeved on the collar. The fourth gear meshes with the third gear.

[0012] Preferably, the blanking assembly includes a material box slidably connected to the workbench. A cylinder is also fixed on the workbench. The output end of the cylinder is fixed to the material box. Two cantilevers are installed on the material box. The two angle steels are respectively installed on the two cantilevers.

[0013] Preferably, two vertically arranged slide rails are fixed to the side walls of the material box, and sliders are slidably connected inside the two slide rails. One end of the cantilever is fixedly connected to the slider. A vertical screw is also provided in the slide rail, and both ends of the vertical screw are rotatably connected to the slide rails. The vertical screw passes through the slider and is threadedly connected to the slider. The bottom end of the vertical screw extends to the outside of the slide rail and is fixed with a driven bevel gear. A driving motor is also fixed to the side wall of the material box, and a horizontal shaft is fixed to the output end of the driving motor. The horizontal shaft is installed on the side wall of the material box through a bearing seat, and two active bevel gears are fixed on the horizontal shaft, and the two active bevel gears are respectively meshed with the driven bevel gears on the two slide rails.

[0014] Preferably, a transverse screw is fixed on the angle steel, the transverse screw is movably plugged into the cantilever, two nuts are threadedly connected to the transverse screw, the two nuts are respectively located on both sides of the cantilever, and the transverse screw is fixed and adjusted by the two nuts.

[0015] Preferably, a vertical insertion hole is provided at the bottom of the annular bottom mold, the top end of the support rod is inserted into the vertical insertion hole, a horizontal insertion hole connected to the vertical insertion hole is provided on the side of the annular bottom mold, a horizontal through hole is provided on the side wall of the support rod, a pin is inserted in the horizontal through hole, and both ends of the pin extend into the horizontal insertion hole.

[0016] Preferably, the mounting groove comprises a coarse cylindrical chamber at the top and a thin cylindrical chamber at the bottom, the lower mold is mounted in the coarse cylindrical chamber by bolts, and the collar is located in the thin cylindrical chamber and at the bottom of the lower mold.

[0017] The present invention also discloses a method for manufacturing a housing sprocket in a VVT system, comprising: preparing raw material powder, forming a sprocket blank by powder molding, sintering the sprocket blank, and subsequent processing of the sprocket, wherein the powder metallurgy equipment mentioned above is used in the step of forming the blank by powder molding.

[0018] Compared with the prior art, the present invention provides a powder metallurgy device and a method for manufacturing a housing sprocket in a VVT system, which has the following beneficial effects:

[0019] 1. The powder metallurgy equipment and the manufacturing method of the housing sprocket in the VVT system, by setting the lower mold as a mold groove, a movable mandrel and an annular bottom mold, and then setting a demoulding component, can respectively drive the mandrel and the annular bottom mold to move and push the pressed blank to the top of the lower mold, so as to achieve fast and stable demoulding, which is beneficial to the processing of special housing sprockets with the risk of getting stuck. At the same time, by setting a blanking component, the blank is first lifted and then transferred by angle steel when the blanking component is in operation, which is beneficial to realize automatic blanking work. Compared with the prior art, it avoids the blank from sliding on the workbench, thereby avoiding the loss and lifting of powder, saving costs, and being safer and more environmentally friendly.

[0020] 2. The powder metallurgy equipment and the manufacturing method for the housing sprocket in the VVT system can drive two angle steels to move vertically and horizontally through a cylinder and a driving motor. Thus, the sprocket blank can be lifted first and then conveyed to the blanking position. This method can prevent the powder on the workbench from being pushed during the blanking process of the sprocket blank, avoid powder sticking to the sprocket blank and causing losses, and prevent the powder from being lifted and reducing the air quality, making it safer and more environmentally friendly. In addition, the driving motor can adjust the initial height of the two angle steels, and turning the nut can adjust the initial distance between the two angle steels, enabling the angle steels to be used for blanking work of workpieces with different specifications, with high applicability.

[0021] 3. The powder metallurgy equipment and the manufacturing method for the housing sprocket in the VVT system fix the annular bottom die and the support rod through a pin. This method can achieve the disassembly and assembly of the annular bottom die and the support rod, facilitating the replacement of the annular bottom die.

[0022] 4. The powder metallurgy equipment and the manufacturing method for the housing sprocket in the VVT system, when the die is disassembled, the hydraulic cylinder extends to drive the collar to move upward. The upward movement of the collar pushes the bottom of the lower die, which can assist in lifting the lower die and facilitate the disassembly and detachment of the lower die. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic perspective view of the powder metallurgy equipment of the present invention Figure 1 ;

[0024] Figure 2 Schematic structural view of the VVT sprocket of the present invention;

[0025] Figure 3 Schematic perspective view of the powder metallurgy equipment of the present invention Figure 2 ;

[0026] Figure 4 Cross-sectional effect diagram of the powder metallurgy equipment of the present invention;

[0027] Figure 5 Of the present invention Figure 4 Enlarged view of part A;

[0028] Figure 6 Cross-sectional effect diagram of the workbench of the present invention;

[0029] Figure 7 Of the present invention Figure 6 Enlarged view of part B;

[0030] Figure 8 Cross-sectional effect diagram of the installation method of the lower die of the present invention.

[0031] In the figure: 1, main machine; 2, workbench; 3, upper die; 4, installation groove; 5, lower die; 51, die cavity; 52, mandrel; 53, annular bottom die; 54, bump; 55, tooth groove; 56, support rod; 57, collar; 58, pin; 6, demoulding assembly; 601, mounting frame; 602, main adjustment motor; 603, first gear; 604, second gear; 605, pallet; 606, hydraulic cylinder; 607, sub-adjustment motor; 608, third gear; 609, fourth gear; 7, blanking assembly; 71, angle steel; 72, cantilever; 701, material box; 702, cylinder; 703, slide rail; 704, slider; 705, vertical screw; 706, driven bevel gear; 707, drive motor; 708, horizontal shaft; 709, bearing seat; 710, driving bevel gear; 711, horizontal screw; 712, nut; 8, housing; 9, tooth block; 10, special-shaped stop block; 11, groove. Detailed implementation mode

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] As introduced in the background art, there are deficiencies in the prior art. To solve the above technical problems, the present application proposes a powder metallurgy equipment and a manufacturing method for a housing sprocket in a VVT system.

[0034] Embodiment 1: Please refer to Figures 1 - 5 , a powder metallurgy equipment, including a main machine 1, a workbench 2 and an upper die 3 installed on the main machine 1. An installation groove 4 is provided on the workbench 2, and a lower die 5 is installed in the installation groove 4. The lower die 5 further includes a die cavity 51, a mandrel 52 arranged in the die cavity 51 and an annular bottom die 53 sleeved on the mandrel 52. A bump 54 is arranged on the side wall of the mandrel 52;

[0035] A demoulding assembly 6 is further arranged in the installation groove 4. The demoulding assembly 6 is used to drive the mandrel 52 to rotate, and the demoulding assembly 6 is also used to drive the annular bottom die 53 to move vertically and rotate;

[0036] A blanking assembly 7 is arranged on the workbench 2. The blanking assembly 7 includes angle steels 71 that can move vertically and move in the blanking direction. The angle steels 71 are arranged in two and are symmetrically distributed;

[0037] After the raw material is injected into the mold cavity 51, the upper mold 3 moves downward to press the raw material. After being pressed and formed, the demolding assembly 6 operates. First, it drives the annular bottom mold 53 to move downward to separate from the workpiece and then rotate a certain angle. Then, it drives the mandrel 52 to rotate, and then drives the annular bottom mold 53 to move upward, thereby demolding the workpiece. After demolding, the blanking assembly 7 operates, driving the two angle steels 71 to move downward in the blanking direction and also move vertically. After lifting the workpiece, it is placed at the blanking position.

[0038] Among them, the upper mold 3 is located directly above the lower mold 5. When the main machine 1 operates, it can drive the upper mold 3 to move vertically to achieve pressing. The cross-sectional shape of the upper mold 3 is the same as the cross-sectional shape of the tooth block part outside the sprocket workpiece. During pressing, the convex block 54 on the mandrel 52 corresponds to the position of the groove 11 on the sprocket workpiece.

[0039] During use, after the upper mold 3 moves downward and inserts into the mold cavity 51, it presses the powder to form. However, at this time, the convex block 54 on the mandrel 52 is engaged with the formed blank. At this time, the demolding assembly 6 is started. After the demolding assembly 6 operates, it first drives the annular bottom mold 53 to move downward. After the annular bottom mold 53 moves downward, it disengages from the inside of the housing 8 on the blank and completely moves to the outside of the housing. Then, the demolding assembly 6 drives the annular bottom mold 53 to rotate a certain angle, so that the annular bottom mold 53 moves to the bottom of the special-shaped stopper 10 on the blank. Then, the demolding assembly 6 drives the mandrel 52 to rotate. Since the blank cannot rotate inside the mold cavity 51 at this time, when the mandrel 52 rotates, the convex block 54 on the mandrel 52 rotates accordingly and disengages from the groove on the blank. Finally, the demolding assembly 6 drives the annular bottom mold 53 to move upward. When the annular bottom mold 53 moves upward, it pushes the bottom of the blank and completely pushes the blank out of the mold cavity 51, thereby realizing the demolding of the sprocket blank. Subsequently, the blanking assembly 7 is started. When the blanking assembly 7 operates, it first drives the two angle steels 71 to move downward in the blanking direction. During the movement of the two angle steels 71, they pass by both sides of the blank, and the angle steels 71 are also located below the tooth block 9 on the blank. Then, the blanking assembly 7 operates, so that the angle steels 71 move downward in the blanking direction and also move vertically upward. When the angle steels 71 move upward, they contact the tooth block on the blank and lift the blank off the top surface of the workbench 2. When the blank is moved to the blanking position, the angle steels 71 move downward again and place the blank, thereby realizing the blanking of the sprocket blank.

[0040] By setting the lower die 5 as the die groove 51, the movable mandrel 52 and the annular bottom die 53, and then setting the demolding assembly 6, the mandrel 52 and the annular bottom die 53 can be respectively driven to move, and then the pressed blank can be pushed above the lower die 5, realizing fast and stable demolding, which is beneficial to the processing of special shell sprockets with a risk of clamping. At the same time, by setting the blanking assembly 7, when the blanking assembly 7 operates, the angle steel 71 is used to lift the blank first and then transfer it, which is beneficial to realizing automatic blanking work. Compared with the prior art, it avoids the sliding of the blank on the workbench 2, thereby avoiding the loss and raising of powder, saving costs, and being safer and more environmentally friendly.

[0041] Embodiment 2: Refer to Figure 6 , different from the above embodiment, the top surface of the lower die 5 is flush with the surface of the workbench 2. The die groove 51 penetrates through the lower die 5 and is internally connected to the installation groove 4. The side wall at the top end of the die groove 51 is provided with a tooth groove 55. The outer diameter of the mandrel 52 is the same as the inner diameter of the annular bottom die 53. The bottom end of the mandrel 52 extends into the installation groove 4 and is rotatably connected to the bottom wall of the installation groove 4. A support rod 56 is fixedly installed at the bottom of the annular bottom die 53. The bottom end of the support rod 56 extends into the installation groove 4 and is fixed with a collar 57. The collar 57 is connected to the bottom wall of the installation groove 4 through the demolding assembly 6.

[0042] Among them, the tooth groove 55 corresponds to the position of the tooth block on the sprocket workpiece. The bottom end of the mandrel 52 is rotatably connected to the bottom wall of the installation groove 4 through a bearing. A plurality of support rods 56 are provided between the collar 57 and the annular bottom die 53. The plurality of support rods 56 are distributed in a circular array to realize uniform support for the annular bottom die 53. By setting the lower die 5 as the movable mandrel 52 and the annular bottom die 53, it is convenient to separately control the movement paths of the mandrel 52 and the annular bottom die 53 to avoid conflicts with the workpiece position, thereby avoiding clamping during demolding.

[0043] Embodiment 3, refer to Figures 4 - 6 , different from the above embodiment, the demolding assembly 6 includes a mounting frame 601 fixed to the bottom wall of the installation groove 4. A main adjustment motor 602 is fixed on the mounting frame 601. A first gear 603 is fixed to the output shaft of the main adjustment motor 602. A second gear 604 is fixedly sleeved at the bottom end of the mandrel 52. The second gear 604 meshes with the first gear 603. The demolding assembly 6 further includes a support plate 605 located at the bottom of the collar 57. The collar 57 is rotatably connected to the support plate 605. A plurality of hydraulic cylinders 606 are provided at the bottom of the support plate 605. Both ends of the hydraulic cylinder 606 are fixed to the bottom wall of the installation groove 4 and the support plate 605 respectively. A secondary adjustment motor 607 is fixed to the edge of the support plate 605. A third gear 608 is fixed to the output shaft of the secondary adjustment motor 607. A fourth gear 609 is fixedly sleeved on the collar 57. The fourth gear 609 meshes with the third gear 608.

[0044] Among them, when the demoulding assembly 6 operates, the hydraulic cylinder 606 is first started. The contraction of the hydraulic cylinder 606 drives the lower movement of the support plate 605. When the support plate 605 moves downward, it drives the lower movement of the collar 57. When the collar 57 moves downward, it drives the lower movement of the support rod 56. When the support rod 56 moves downward, it drives the lower movement of the annular bottom mold 53, so that the annular bottom mold 53 is separated from the shell of the formed sprocket blank. When the annular bottom mold 53 moves to the bottom of the shell of the sprocket blank, the auxiliary adjustment motor 607 is then started. After the auxiliary adjustment motor 607 operates, it drives the rotation of the third gear 608. After the third gear 608 rotates, it drives the rotation of the fourth gear 609. After the fourth gear 609 rotates, it drives the rotation of the collar 57. After the collar 57 rotates, it drives the rotation of the support rod 56 and the annular bottom mold 53, so that the annular bottom mold 53 is aligned with the bottom of the special-shaped stopper 10 of the sprocket blank. Then the main adjustment motor 602 is started. The main adjustment motor 602 drives the rotation of the first gear 603. When the first gear 603 rotates, it drives the rotation of the second gear 604. When the second gear 604 rotates, it drives the rotation of the mandrel 52. When the mandrel 52 rotates, it drives the rotation of the convex block 54, so that the convex block 54 is separated from the groove in the sprocket blank, thereby avoiding the engagement of the convex block 54 and the groove. Finally, the hydraulic cylinder 606 is started again. After the hydraulic cylinder 606 extends, it drives the upward movement of the annular bottom mold 53. The annular bottom mold 53 pushes the sprocket blank upward until the sprocket blank is completely separated from the mold groove 51;

[0045] By setting the demoulding assembly 6, when demoulding, the annular bottom mold 53 is first driven to be separated from the sprocket blank and move to the bottom of the sprocket blank, then the mandrel 52 is driven to rotate so that the positions of the convex block 54 and the groove on the sprocket blank are staggered, and finally the annular bottom mold 53 is driven to move upward again to eject the sprocket blank from the mold groove 51. By this method, it is beneficial to carry out efficient demoulding work on the shell sprocket with this special-shaped structure, with high demoulding efficiency, anti-sticking, and stable operation.

[0046] Example 4, refer to Figures 3 - 7, different from the above embodiments, the blanking assembly 7 includes a material box 701 slidably connected to the workbench 2. A cylinder 702 is also fixed on the workbench 2, and the output end of the cylinder 702 is fixedly connected to the material box 701. Two cantilevers 72 are installed on the material box 701, and the two angle steels 71 are respectively installed on the two cantilevers 72. Two vertically arranged slide rails 703 are fixed on the side wall of the material box 701. Sliders 704 are slidably connected inside the two slide rails 703. One end of the cantilever 72 is fixedly connected to the slider 704. A vertical screw 705 is also arranged in the slide rail 703. Both ends of the vertical screw 705 are rotatably connected to the slide rail 703. The vertical screw 705 passes through the slider 704 and is threadedly connected to the slider 704. The bottom end of the vertical screw 705 extends outside the slide rail 703 and is fixed with a driven bevel gear 706. A driving motor 707 is also fixed on the side wall of the material box 701. The output end of the driving motor 707 is fixed with a horizontal shaft 708. The horizontal shaft 708 is installed on the side wall of the material box 701 through a bearing seat 709. Two driving bevel gears 710 are fixed on the horizontal shaft 708. The two driving bevel gears 710 are respectively engaged with the driven bevel gears 706 on the two slide rails 703. A horizontal screw 711 is fixed on the angle steel 71. The horizontal screw 711 is movably inserted into the cantilever 72. Two nuts 712 are threadedly connected to the horizontal screw 711. The two nuts 712 are respectively located on both sides of the cantilever 72. The horizontal screw 711 is fixed and adjusted through the two nuts 712.

[0047] Among them, two groups of guide rails are arranged on the workbench 2. The guide rails extend in the discharging direction. The cylinder 702 is in the same direction as the guide rails. The material box 701 is slidably connected to the guide rails. After the two nuts 712 are tightened, they fit against both sides of the cantilever 72, thereby fixing the horizontal screw 711.

[0048] During use, the cylinder 702 is started. After the cylinder 702 extends, it pushes the material box 701 to slide. When the material box 701 slides, it drives the slide rail 703, the cantilever 72 and the angle steel 71 to move. The two angle steels 71 just move to both sides of the sprocket blank after demoulding and are located below the tooth blocks on the sprocket blank. At this time, the drive motor 707 is started. After the drive motor 707 operates, it drives the horizontal shaft 708 to rotate. When the horizontal shaft 708 rotates, it drives the two driving bevel gears 710 to rotate. When the two driving bevel gears 710 rotate, they drive the two driven bevel gears 706 to rotate. When the two driven bevel gears 706 rotate, they drive the vertical screw rods 705 on the two slide rails 703 to rotate simultaneously. When the vertical screw rods 705 rotate, they drive the sliders 704 to move upward along the slide rails 703. When the sliders 704 move upward, they drive the cantilever 72 to move upward. When the cantilever 72 moves upward, it drives the horizontal screw rod 711 and the angle steel 71 to move upward. After the two angle steels 71 move upward simultaneously, they contact the tooth blocks on the sprocket blank and lift the sprocket blank. When the angle steel 71 moves in the blanking direction, it drives the sprocket blank to move to the blanking position. When the sprocket blank reaches the blanking position, the drive motor 707 is started again, and the sprocket blank is placed, thus realizing blanking;

[0049] By setting the blanking component 7, the cylinder 702 and the drive motor 707 can drive the two angle steels 71 to move vertically and horizontally. Thus, the sprocket blank can be lifted first and then conveyed to the blanking position. This method can prevent the powder on the workbench 2 from being pushed during the blanking process of the sprocket blank, thereby avoiding the loss caused by the powder sticking to the sprocket blank and also preventing the powder from rising and reducing the air quality, which is safer and more environmentally friendly. In addition, the drive motor 707 can adjust the initial height of the two angle steels 71, and turning the nut 712 can adjust the initial spacing of the two angle steels 71, enabling the angle steels 71 to be used for the blanking work of workpieces of different specifications, with high applicability.

[0050] Embodiment Five. Refer to Figure 8 , which is different from the above embodiment. A vertical insertion hole is opened at the bottom of the annular bottom die 53, the top end of the support rod 56 is inserted into the vertical insertion hole, a horizontal insertion hole communicating with the vertical insertion hole is opened on the side of the annular bottom die 53, a horizontal through hole is opened on the side wall of the support rod 56, and a pin 58 is inserted into the horizontal through hole. Both ends of the pin 58 extend into the horizontal insertion hole.

[0051] Among them, both ends of the horizontal insertion hole extend to the outer side wall and the inner side wall of the annular bottom die 53 respectively, and the pin 58 is in interference fit with the horizontal insertion hole and the horizontal through hole, so as to realize the fixation of the annular bottom die 53 and the support rod 56. This method can realize the disassembly and assembly of the annular bottom die 53 and the support rod 56, facilitating the replacement of the annular bottom die 53.

[0052] Embodiment Six. Refer to Figure 8, different from the above embodiments, the installation groove 4 includes a thick cylindrical chamber at the top and a thin cylindrical chamber at the bottom. The lower die 5 is installed in the thick cylindrical chamber through bolts, and the collar 57 is located in the thin cylindrical chamber and at the bottom of the lower die 5.

[0053] Among them, when the lower die 5 needs to be disassembled, first rotate the bolt to loosen the lower die 5, and then move the lower die 5 upward. At this time, the hydraulic cylinder 606 can also be activated. After the hydraulic cylinder 606 extends, it drives the collar 57 to move upward. The upward movement of the collar 57 pushes the bottom of the lower die 5, which can assist in lifting the lower die 5 and facilitate the disassembly and detachment of the lower die 5.

[0054] Embodiment Seven, a manufacturing method for a housing sprocket in a VVT system, includes: raw material powder preparation, powder molding to form a sprocket blank, sintering of the sprocket blank, and subsequent processing of the sprocket. Among them, the above powder metallurgy equipment is used in the process of powder molding to form the blank.

[0055] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A powder metallurgy device for a housing sprocket in a VVT system, comprising a main machine, a workbench and an upper die installed on the main machine, characterized in that: An installation groove is provided on the workbench. A lower mold is installed in the installation groove. The lower mold further includes a mold cavity, a mandrel disposed in the mold cavity, and an annular bottom mold sleeved on the mandrel. A convex block is provided on the side wall of the mandrel. A demolding assembly is further provided in the installation groove. The demolding assembly is used to drive the mandrel to rotate. The demolding assembly is further used to drive the annular bottom mold to move vertically and rotate. A blanking assembly is provided on the workbench. The blanking assembly includes angle steels capable of moving vertically and moving in the blanking direction. There are two angle steels which are symmetrically distributed. The blanking assembly includes a material box slidably connected to the workbench. A cylinder is further fixed on the workbench. The output end of the cylinder is fixedly connected to the material box. Two cantilevers are installed on the material box. The two angle steels are respectively installed on the two cantilevers. Two vertically arranged slide rails are fixed on the side wall of the material box. Sliders are slidably connected inside the two slide rails. One end of the cantilever is fixedly connected to the slider. A vertical screw rod is further provided in the slide rail. Both ends of the vertical screw rod are rotatably connected to the slide rail. The vertical screw rod penetrates through the slider and is threadedly connected to the slider. The bottom end of the vertical screw rod extends outside the slide rail and is fixed with a driven bevel gear. A driving motor is further fixed on the side wall of the material box. The output end of the driving motor is fixed with a horizontal shaft. The horizontal shaft is installed on the side wall of the material box through a bearing seat. Two driving bevel gears are fixed on the horizontal shaft. The two driving bevel gears are respectively engaged with the driven bevel gears on the two slide rails. After the raw material is injected into the mold cavity, the upper mold moves down to press the raw material. After being pressed and formed, the demolding assembly operates. First, it drives the annular bottom mold to move down to separate from the workpiece and then rotate. Then, it drives the mandrel to rotate. Then, it drives the annular bottom mold to move up, thereby demolding the workpiece. After demolding, the blanking assembly operates, driving the two angle steels to move in the blanking direction and move vertically at the same time, lifting the workpiece and placing it at the blanking position.

2. The powder metallurgy equipment for the housing sprocket in the VVT system according to claim 1, characterized in that: The top surface of the lower mold is flush with the surface of the workbench. The mold cavity penetrates through the lower mold and communicates with the inside of the installation groove. Tooth grooves are provided on the side wall at the top end of the mold cavity. The outer diameter of the mandrel is the same as the inner diameter of the annular bottom mold. The bottom end of the mandrel extends into the installation groove and is rotatably connected to the bottom wall of the installation groove. A support rod is fixedly installed at the bottom of the annular bottom mold. The bottom end of the support rod extends into the installation groove and is fixed with a collar. The collar is connected to the bottom wall of the installation groove through the demolding assembly.

3. A powder metallurgy device for a housing sprocket in a VVT system according to claim 2, characterized in that: The demolding assembly includes a mounting frame fixed on the bottom wall of the installation groove. A main adjustment motor is fixed on the mounting frame. A first gear is fixed on the output shaft of the main adjustment motor. A second gear is fixedly sleeved at the bottom end of the mandrel. The second gear is engaged with the first gear.

4. A powder metallurgy device for a housing sprocket in a VVT system according to claim 3, characterized in that: The demolding assembly further includes a support plate located at the bottom of the collar. The collar is rotatably connected to the support plate. A plurality of hydraulic cylinders are provided at the bottom of the support plate. Both ends of the hydraulic cylinder are respectively fixed to the bottom wall of the installation groove and the support plate. A secondary adjustment motor is fixed at the edge of the support plate. A third gear is fixed on the output shaft of the secondary adjustment motor. A fourth gear is fixedly sleeved on the collar. The fourth gear is engaged with the third gear.

5. A powder metallurgy device for a housing sprocket in a VVT system according to claim 1, characterized in that: A horizontal screw rod is fixed on the angle steel. The horizontal screw rod is movably inserted into the cantilever. Two nuts are threadedly connected to the horizontal screw rod. The two nuts are respectively located on both sides of the cantilever. The horizontal screw rod is fixed and adjusted by the two nuts.

6. A powder metallurgy device for a housing sprocket in a VVT system according to claim 2, characterized in that: Vertical insertion holes are formed at the bottom of the annular bottom die. The top end of the support rod is inserted into the vertical insertion holes. Horizontal insertion holes communicating with the vertical insertion holes are formed on the side surface of the annular bottom die. Horizontal through holes are formed on the side wall of the support rod. A pin is inserted into the horizontal through holes. Both ends of the pin extend into the horizontal insertion holes.

7. A powder metallurgy device for a housing sprocket in a VVT system according to claim 2, characterized in that: The installation groove includes a thick cylindrical chamber at the top and a thin cylindrical chamber at the bottom. The lower die is installed in the thick cylindrical chamber by bolts. The collar is located in the thin cylindrical chamber and at the bottom of the lower die.

8. A manufacturing method for a housing sprocket in a VVT system, characterized in that: Comprising: Raw material powder preparation, powder molding to form a sprocket blank, sintering of the sprocket blank, and subsequent processing of the sprocket. Among them, in the process of powder molding to form the sprocket blank, a powder metallurgy device for the housing sprocket in the VVT system described in any one of claims 1-7 is used.

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