Die casting device for copper alloy bearing retainer

Abstract

The invention relates to the technical field of bearing retainer die-casting, and discloses a die-casting device for a copper alloy bearing retainer, the die-casting device comprises a static template, a movable template and a top plate, the movable template is connected with the static template through a plurality of hydraulic cylinders A, the top plate is fixedly connected to the top of the movable template, and a cavity for forming the bearing retainer is formed in the surface of the static template; a pressure feeding cavity is formed in the movable mold plate, the top plate is connected with the pressure feeding cavity through a pressure feeding assembly, a soup feeding piece used for allowing molten copper alloy to enter is installed on the surface of the movable mold plate, a soup channel communicated with the pressure feeding cavity is formed in the soup feeding piece, and the material uniformizing assembly is arranged at the bottom of the movable mold plate. The device is used for uniformly distributing copper alloy melt in a cavity. Through rotary feeding of the movable ring, the discharging uniformity of all areas in the cavity is improved, through two-side feeding, the cooling consistency of melt on the two sides and melt in the center area is improved, cracks are reduced, and the die-casting integrity and completeness are improved.

Description

Technical Field

[0001] The invention relates to the technical field of die-casting of bearing retainers, and more particularly to a die-casting device for a copper alloy bearing retainer. Background Art

[0002] The bearing cage is a key mechanical component, which is mainly used to support and maintain the position of rolling elements to ensure the stability and accuracy of the bearing during operation. Modern bearing cages should have properties such as wear resistance, high temperature resistance and corrosion resistance. Copper alloy is often selected as the cage material due to its excellent wear resistance, corrosion resistance and good thermal conductivity. The manufacturing process of copper alloy cages is an important process that determines its properties. Existing copper alloy bearing cages are mostly manufactured by die casting.

[0003] At present, in the one-piece die-casting process of copper alloy bearing cages, since the mold cavity of small bearing cages is small and the dosage is small, the die-casting process is fast and the forming rate is high. However, in the one-piece die-casting of large and large segmented copper alloy bearing cages, due to factors such as large cavity or complex mold design, the amount of molten copper alloy melt forced into the cavity is large, and in order to avoid defects before cooling and solidification, it is necessary to ensure that the molten copper alloy melt can be quickly filled into the mold cavity, which may easily lead to uneven distribution of melt in various regions, and the part where the melt contacts the inner wall of the cavity will cool faster than the central area due to the temperature difference, which is more prone to cracks and other problems. Although there is preheating in the mold cavity, the melting point of the copper alloy solution is higher, reaching thousands of degrees when entering the cavity. Relatively speaking, it is difficult for the preheating of the inner wall of the cavity to have a certain effect, which is not conducive to the one-piece die-casting of the copper alloy bearing cage. Summary of the invention

[0004] The invention discloses a die-casting device for a copper alloy bearing retainer, which solves the technical problems in the above-mentioned background technology.

[0005] The first aspect of the present invention discloses a die-casting device for a copper alloy bearing cage, comprising a static die plate, a dynamic die plate and a top plate, wherein a bottom plate is installed at the bottom of the static die plate for fixing the position of the entire device, the dynamic die plate is connected to the static die plate through a plurality of hydraulic cylinders A, the top plate is fixedly connected to the top of the dynamic die plate, and a cavity for forming the bearing cage is opened on the surface of the static die plate; A pressure supply cavity is provided in the movable platen, the top plate is connected to the pressure supply cavity through a pressure supply assembly, a soup supply piece for the copper alloy melt to enter is installed on the surface of the movable platen, and a soup channel connected to the pressure supply cavity is provided in the soup supply piece; A material leveling component is arranged at the bottom of the movable template and is used to evenly distribute the copper alloy melt in the mold cavity. The material leveling component includes an outer positioning block and an inner positioning block fixedly connected to the bottom of the movable template. A movable ring is slidably connected between the outer positioning block and the inner positioning block. A plurality of feeding holes for the melt to pass through are opened on the surface of the movable ring. The feeding holes are located between the pressure feeding cavity and the mold cavity. A driving component for rotating the movable ring is installed on the surface of the inner positioning block. The driving component includes a driving motor fixedly connected to the movable template. A driving gear is fixedly connected to the output end of the driving motor. A plurality of tooth grooves matching the driving gear are arranged on the inner wall of the movable ring. The inner positioning block and the outer positioning block are respectively provided with a side feed groove A and a side feed groove B, the side feed groove A and the side feed groove B respectively pass through the bottom of the inner positioning block and the outer positioning block, and are respectively arranged on both sides of the inner wall close to the cavity, and the side feed groove A and the side feed groove B are connected to the pressure feeding cavity through auxiliary components.

[0006] Preferably, the pressure supply assembly includes a hydraulic cylinder B fixedly connected to the top plate, the output shaft of the hydraulic cylinder B faces the side close to the movable template, and is fixedly connected to a fixed frame, a plurality of punches are fixedly connected to the bottom of the fixed frame, and the lower ends of the punches are inserted into the movable template and extend into the pressure supply cavity.

[0007] Preferably, a punch plate adapted to the pressure chamber is fixedly connected to the lower end of the punch.

[0008] Preferably, the auxiliary component includes a movable groove and an adjusting groove opened inside the movable template, the movable groove intersects the adjusting groove vertically, one end of the movable groove is connected to the inside of the pressure supply chamber, the lower end of the adjusting groove passes through the bottom of the movable template, and a block A is slidably connected in the movable groove, and the block A is connected to the movable template through a spring. The upper end of the side feed groove A passes through the connecting block and the movable template respectively and is connected to the movable groove. A dividing groove A adapted to the side feed groove A is opened on the surface of the block A, and a pushing component for pushing the block A to extend into the pressure supply chamber is installed in the adjusting groove.

[0009] Preferably, the pushing assembly includes an adjusting block slidably connected in the adjusting groove, the top of the adjusting block abuts against the stop block A, a stepper motor A is fixedly connected in the movable template, a positioning gear is fixedly connected to the output end of the stepper motor A, and a tooth groove adapted to the positioning gear is provided on the inner wall of the adjusting block.

[0010] Preferably, a photoelectric sensor is fixedly connected to the surface of the adjustment block, the photoelectric sensor is directly opposite to the tooth groove, and a photoelectric receiver adapted to the photoelectric sensor is arranged on the surface of the tooth groove.

[0011] Preferably, an auxiliary groove is provided in the movable template, one end of the auxiliary groove is connected to the pressure feeding chamber and is arranged opposite to the movable groove, a block B is slidably connected in the auxiliary groove, the upper end of the side feed groove B passes through the movable template and is connected to the inside of the auxiliary groove, a dividing groove B adapted to the side feed groove B is provided in the block B, a stepper motor B is fixedly connected in the movable template, a synchronous gear is fixedly connected to the output end of the stepper motor B, and a plurality of gear blocks adapted to the synchronous gear are provided on the surface of the block B.

[0012] Preferably, a synchronous servo controller is installed in the moving template, and the synchronous servo controller is electrically connected to the stepper motor A, the stepper motor B and the photoelectric sensor respectively.

[0013] The second aspect of the present invention discloses a forging method for a large copper alloy segmented cage, comprising the following steps: Step 1: Use a sawing machine to cut materials according to product specifications; Step 2: Place the raw material ingot in a heating furnace for heating, and then transfer it to a hydraulic press for free forging; Step 3: Process the copper ingot after free forging into a ring to the required size; Step 4: Use a sawing machine to cut the whole ring; Step 5: After heating the cut sections, transfer them to the die forging machine for die forging, and punch out pockets according to the indexing; Step 6: The die-forged product is subjected to a solution + aging heat treatment process to eliminate forging stress and achieve performance enhancement; Step 7: Use a lathe to process the inner and outer diameters and the upper and lower end bosses into finished products; Step 8: Use a CNC milling machine to perform milling operations to finish the pocket holes into finished products.

[0014] Preferably, the free forging process in step 2 includes heating the raw material ingot to 900±5°C, keeping the temperature for 2h, and then using a 3500t hydraulic press for roughing and punching, with the initial forging temperature being 900°C and the final forging temperature being 800°C; In step 3, the ring rolling process starts at a temperature of 850° C., ends at a temperature of 750° C., and has a rolling-expansion ratio of 2.0, and the copper ingot is rolled to a required size; The slitting process in step 4 includes using a sawing machine to slit the ring forging into 10 equal parts, thereby cutting the ring forging into 10 segmented parts; In the step 5, the die preheating temperature of the die forging process is 500°C, the die forging temperature is 750°C, and the pressure is 3000KN; The solution temperature of the aging heat treatment process in step 6 is 650°C, and cooling with a water-based quenching liquid is performed, and the aging temperature is 450°C.

[0015] The milling process in step 8 refers to finishing the pockets after die forging.

[0016] The beneficial effects of the present invention are: The present invention feeds the copper alloy melt by rotating the movable ring so that it moves in a circle through the feeding holes opened on the surface, thereby improving the uniformity of feeding in each area in the cavity. Furthermore, by setting an auxiliary component, after a single circle of feeding is completed, the molten metal in the pressure feeding cavity is introduced from the positions on both sides of the cavity close to the inner wall through the side feed grooves A and B on both sides, thereby separately replenishing the molten metal on both sides of the inner wall of the cavity, improving the cooling consistency of the molten metal on both sides and the molten metal in the center area, and effectively avoiding problems such as cracks caused by the different cooling speeds on both sides of the inner wall of the cavity and the center area due to conventional feeding, thereby improving the die-casting integrity and integrity of the large copper alloy retainer to a certain extent, and improving the quality of the finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 The present invention is a schematic diagram for showing the state of the static mold plate and the movable mold plate after mold closing; Figure 3 It is a cross-sectional view of the present invention for showing the connection state between the soup channel and the pressure supply chamber; Figure 4 It is a cross-sectional view of the present invention for showing the internal structure of the moving template; Figure 5 It is a disassembled diagram of the present invention for showing the positional relationship between the movable ring, the outer positioning block and the inner positioning block; Figure 6 is a schematic diagram of the present invention for displaying auxiliary components; Figure 7 The present invention Figure 6 A in the enlarged view; Figure 8 It is a schematic diagram of the present invention for separately showing the adjustment block and its surface structure; Fig. 9 This is a style diagram used by the present invention to show the finished product of the retaining frame after processing in Example 2.

[0018] In the figure: 1, static template; 11, cavity; 12, bottom plate; 2, dynamic template; 21, hydraulic cylinder A; 22, soup feeding piece; 221, soup channel; 23, pressure feeding cavity; 231, outer positioning block; 232, inner positioning block; 233, connecting block; 24, movable ring; 241, feeding hole; 242, tooth groove; 243, driving motor; 244, driving gear; 3, top plate; 31, hydraulic cylinder B; 311, fixing frame; 312, punch; 313, punch plate; 4, stopper A; 41, distribution trough A; 411, side feed trough A; 42, spring; 43, stepping motor A; 431, positioning gear; 432, adjusting block; 433, photoelectric sensor; 44, stopper B; 441, distribution trough B; 442, side feed trough B; 443, stepping motor B. DETAILED DESCRIPTION

[0019] The subject matter described herein will now be discussed with reference to example implementations. It should be understood that the discussion of these implementations is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the present specification. Various examples may omit, replace, or add various processes or components as needed. In addition, the features described in some examples may also be combined in other examples.

[0020] Embodiment 1: The embodiment of the present invention discloses a die-casting device for a copper alloy bearing cage, such as Figure 1 , Figure 2 and Figure 3As shown, it includes a static template 1, a dynamic template 2 and a top plate 3. A bottom plate 12 is installed at the bottom of the static template 1 to fix the position of the entire device, and the entire device is installed on the ground or a rack, and the static template 1 does not move relative to the ground. The dynamic template 2 is connected to the static template 1 through a plurality of hydraulic cylinders A21. The fixed end of the hydraulic cylinder A21 is installed in the dynamic template 2, and the output end is fixedly connected to the surface of the static template 1. When the hydraulic cylinder A21 outputs or contracts, the dynamic template 2 moves in a direction away from or close to the static template 1. When the dynamic template 2 is close to the static template 1, it is mold closing, and die casting can be performed after mold closing. Otherwise, it is mold opening. The top plate 3 is fixedly connected to the top of the dynamic template 2. The top plate 3 is separated from the dynamic template 2 by a certain distance. A cavity 11 for forming a bearing retainer is opened on the surface of the static template 1. The cavity 11 is used for pouring molten metal and performing die casting. The shape of the inner cavity is selected according to the forming shape of different large or large segmented copper alloy retainers. A pressure chamber 23 is provided in the movable template 2. The top plate 3 is connected to the pressure chamber 23 through a pressure assembly. The pressure chamber 23 is used to temporarily accommodate the molten metal, and the molten metal is pressed into the mold cavity 11 by pressing down the pressure assembly. A soup feeding piece 22 for the copper alloy molten metal to enter is installed on the surface of the movable template 2. A soup channel 221 connected to the pressure chamber 23 is provided in the soup feeding piece 22, wherein the soup feeding piece 22 is used to be connected to an external molten metal firing container, or when the molten metal needs to be fed, the copper alloy molten metal is added to the soup channel 221 through a molten metal spoon. When the pressure assembly contracts, a negative pressure is formed in the pressure chamber 23, thereby sucking the molten metal in the soup channel 221 into the pressure chamber 23.

[0021] The material leveling component is arranged at the bottom of the movable template 2, and is used to evenly distribute the copper alloy melt in the cavity 11. The material leveling component includes an outer positioning block 231 and an inner positioning block 232 fixedly connected to the bottom of the movable template 2. A movable ring 24 is slidably connected between the outer positioning block 231 and the inner positioning block 232. There is a certain gap between the outer positioning block 231 and the inner positioning block 232. The movable ring 24 slides in the gap and fills the gap. A plurality of feeding holes 241 for the molten metal to pass through are provided on the surface of the movable ring 24. The feeding holes 241 are located between the pressure feeding cavity 23 and the cavity 11. Since the movable ring 24 fills the gap, the molten metal can only pass through the feeding holes 241. A driving component for rotating the movable ring 24 is installed on the surface of the inner positioning block 232. The driving component includes a driving motor 243 fixedly connected to the movable template 2. A driving gear 244 is fixedly connected to the output end of the driving motor 243. The inner wall of the movable ring 24 is provided with a plurality of tooth grooves 242 adapted to the driving gear 244.

[0022] Specifically, the output of the driving motor 243 can drive the active gear 244 to rotate, and drive the tooth groove 242 meshing with it to move, so that the movable ring 24 can rotate between the outer positioning block 231 and the inner positioning block 232. In conjunction with the downward pressure provided by the pressure assembly, the molten metal enters the cavity 11 below through the feeding hole 241 on the surface of the movable ring 24. Due to the rotation of the movable ring 24, the feeding hole 241 rotates accordingly to feed the material, thereby spreading the molten metal in the cavity 11 in an annular direction, thereby avoiding uneven distribution of the molten metal in various areas of the cavity 11, which may cause surface defects on the retaining frame after die-casting and insufficient strength.

[0023] The inner positioning block 232 and the outer positioning block 231 are respectively provided with a side feed groove A411 and a side feed groove B442, which respectively penetrate the bottom of the inner positioning block 232 and the outer positioning block 231, and are respectively arranged on both sides of the inner wall near the cavity 11. The side feed groove A411 and the side feed groove B442 are connected to the pressure feeding cavity 23 through auxiliary components. Through the setting of the auxiliary components, the molten metal is introduced from the side feed groove A411 and the side feed groove B442, and discharged from the inner wall of the cavity 11 near the two sides, so as to effectively supplement the amount of molten metal at the side wall position, and further improve the temperature cooling consistency between the inner wall and the central area of ​​the cavity 11, so as to avoid cracks, defects and deformation.

[0024] like Figure 3 and Figure 4 As shown, in this embodiment, the pressure supply assembly includes a hydraulic cylinder B31 fixedly connected to the top plate 3, the output shaft of the hydraulic cylinder B31 faces the side close to the movable template 2, and is fixedly connected to a fixed frame 311, and a plurality of punches 312 are fixedly connected to the bottom of the fixed frame 311, the lower end of the punch 312 is inserted into the movable template 2 and extends into the pressure supply cavity 23, and the connection between the punch 312 and the movable template 2 is sealed to improve the sealing of the die casting.

[0025] Furthermore, a punch plate 313 adapted to the pressure chamber 23 is fixedly connected to the lower end of the punch 312. The shape of the punch plate 313 matches the shape of the inner wall of the pressure chamber 23. After the punch plate 313 is fully pressed down, it will be completely fitted with the bottom of the pressure chamber 23. When the punch 312 presses down the punch plate 313, the molten metal will be squeezed downward out of the pressure chamber 23.

[0026] Specifically, through the contraction of the hydraulic cylinder B31, the fixed frame 311 pulls the punch 312 to move upward, and the punch plate 313 moves upward in the pressure chamber 23 simultaneously, increasing the internal space of the pressure chamber 23 and forming a negative pressure, thereby sucking the external molten metal into the pressure chamber 23 through the soup channel 221 for temporary storage. Subsequently, through the output of the hydraulic cylinder B31, the fixed frame 311 is pushed to press down a number of punches 312, so that the punches 312 press down the punch plate 313, gradually reducing the internal space of the pressure chamber 23, generating downward pressure on the molten metal, and pressing the molten metal downward from the pressure chamber 23 into the mold cavity 11.

[0027] like Figure 6 and Figure 7 As shown, in this embodiment, the auxiliary component includes a movable groove and an adjusting groove opened inside the movable template 2, the movable groove and the adjusting groove intersect vertically, one end of the movable groove is connected to the inside of the pressure supply chamber 23, the lower end of the adjusting groove passes through the bottom of the movable template 2, and a stopper A4 is slidably connected in the movable groove, the stopper A4 is connected to the movable template 2 through a spring 42, and the two ends of the spring 42 are respectively fixedly connected to the stopper A4 and the movable template 2. When the spring 42 is in a relaxed state, the stopper A4 is completely received in the movable groove, and the upper ends of the side feed groove A411 respectively pass through the connecting block 233 and the movable template 2, and are connected to the movable groove. A dividing groove A41 adapted to the side feed groove A411 is opened on the surface of the stopper A4, and the dividing groove A41 is in a horizontal "Z" shape, and the upper and lower ends of the dividing groove A41 respectively pass through the upper and lower surfaces of the stopper A4, and at the stopper When A4 is completely received in the movable groove, the upper end of the dividing groove A41 is blocked by the inner wall of the movable groove, and the lower end of the dividing groove A41 is not connected with the side feed groove A411. A pushing component for pushing the stopper A4 to extend into the pressure chamber 23 is installed in the adjusting groove of the dividing groove A41. When the stopper A4 is pushed out from the movable groove into the pressure chamber 23 by the pushing component, the upper end of the dividing groove A41 is no longer blocked by the inner wall of the movable groove, and the molten metal can be pressed into the dividing groove A41. At the same time, the lower end of the dividing groove A41 moves to be connected with the side feed groove A411, so that the molten metal entering the dividing groove A41 can enter the side feed groove A411, and after moving downward, it flows out from a position close to the inner wall of one side of the cavity 11, thereby laterally replenishing the molten metal in the cavity 11 to maintain the temperature and cooling rate of the two sides and the center area of ​​the casting liquid constant.

[0028] Furthermore, the pushing component includes an adjusting block 432 which is slidably connected in the adjusting groove, the top of the adjusting block 432 abuts against the stop block A4, the side of the stop block A4 close to the adjusting block 432 is set as an arc surface, a stepper motor A43 is fixedly connected in the movable template 2, a positioning gear 431 is fixedly connected to the output end of the stepper motor A43, and a tooth groove 242 adapted to the positioning gear 431 is provided on the inner wall of the adjusting block 432, and the positioning gear 431 is meshed with the tooth groove 242.

[0029] Furthermore, Figure 6 , Figure 7 and Figure 8 As shown, in this embodiment, a photoelectric sensor 433 is fixedly connected to the surface of the adjustment block 432, and the photoelectric sensor 433 is directly opposite to the tooth groove 242. A photoelectric receiver adapted to the photoelectric sensor 433 is arranged on the surface of the tooth groove 242, and the photoelectric receiver is only arranged on the surface of one of the tooth grooves 242. In this way, under normal conditions, the photoelectric receiver and the photoelectric sensor 433 are directly opposite to each other and form a connection path with each other. After the active gear 244 rotates to drive the tooth groove 242 to move and the movable ring 24 rotates, the photoelectric receiver and the photoelectric sensor 433 are misaligned and disconnected, until the movable ring 24 rotates one circle, the photoelectric receiver and the photoelectric sensor 433 are reconnected to form. Passage, at this time, the movable ring 24 rotates one circle, so that a circle of molten liquid is laid on the bottom of the cavity 11, and the photoelectric receiver and the photoelectric sensor 433 are connected again to form a passage, which means that the molten liquid at the bottom of the cavity is laid. At this time, the output of the stepper motor A43 drives the positioning gear 431 to rotate, and the tooth groove 242 matched with it moves accordingly, so that the adjustment block 432 moves up, pushing the stopper A4 abutting against it to move outward, and compressing the spring 42, so that the lower end of the distribution trough A41 can be connected with the side feed trough A411, so that the molten liquid can enter the cavity 11 downward through the side feed trough A411, and flow out from the position close to the side wall of the cavity 11, and replenish the positions on both sides of the cavity 11 close to the inner wall.

[0030] It is worth noting that there are multiple groups of auxiliary components arranged around the circumference of the movable ring 24 to improve the uniformity of replenishing the melt, and the photoelectric receivers and photoelectric sensors 433 in several groups of auxiliary components are arranged independently of each other, and the photoelectric receivers and photoelectric sensors 433 between different groups will not be connected to each other to form a passage to avoid mutual influence during rotation.

[0031] In addition, if Figure 8 As shown, the bottom of the adjustment block 432 is bent in an "L" shape, and the photoelectric sensor 433 is arranged at the end after the bottom is bent. This arrangement can stagger the photoelectric sensor 433 and the connecting block 233 to avoid the connecting block 233 blocking the signal transmission, so that the photoelectric sensor 433 cannot be connected to the photoelectric receiver to form a path.

[0032] In one embodiment, an auxiliary groove is provided in the movable template 2, one end of the auxiliary groove is connected to the pressure feeding chamber 23, and is arranged opposite to the movable groove, a stopper B44 is slidably connected in the auxiliary groove, the upper end of the side feed groove B442 passes through the movable template 2, and is connected to the inside of the auxiliary groove, a dividing groove B441 adapted to the side feed groove B442 is provided in the stopper B44, the dividing groove B441 is arranged opposite to the dividing groove A41, and is also in a horizontal "Z" shape, under normal conditions, the upper end of the dividing groove B441 is blocked by the inner wall of the auxiliary groove, and the lower end thereof is not connected to the side feed groove B442, a stepper motor B443 is fixedly connected in the movable template 2, a synchronous gear is fixedly connected to the output end of the stepper motor B443, and the stopper The surface of B44 is provided with a number of tooth blocks adapted to the synchronous gear, and the synchronous gear is meshed with the number of tooth blocks. Similarly, through the output of the stepper motor B443, the synchronous gear is driven to rotate, and the tooth blocks meshed with it are moved, so that the entire stopper B44 moves horizontally toward the pressure feeding chamber 23, so that the upper end of the dividing trough B441 is no longer blocked by the inner wall of the auxiliary trough, and the lower end of the dividing trough B441 is connected with the side feed trough B442. The molten metal can enter the side feed trough B442 through the dividing trough B441 and be pressed into the bottom cavity 11. Since the side feed trough A411 and the side feed trough B442 are respectively arranged at the two sides close to the inner wall of the cavity 11, the two can respectively replenish the molten metal on both sides of the inner wall of the cavity 11.

[0033] Furthermore, a synchronous servo controller is installed in the movable template 2, and the synchronous servo controller is electrically connected to the stepper motor A43, the stepper motor B443 and the photoelectric sensor 433 respectively. The synchronous servo controller can synchronize the output actions of the stepper motor A43 and the stepper motor B443, and then after the photoelectric sensor 433 senses the signal after the photoelectric receiver rotates one circle, the signal is transmitted to the synchronous servo controller, and then the synchronous servo controller controls the synchronous output of the stepper motor A43 and the stepper motor B443 respectively, so as to synchronously replenish the melt on both sides of the inner wall of the cavity 11.

[0034] Embodiment 2: This embodiment discloses a forging method for a large copper alloy segmented cage, comprising the following steps: Step 1: Cut the rough bearing retainer formed by die casting in Example 1 according to product specifications using a sawing machine; Step 2: Place the raw material ingot in a heating furnace for heating, and then transfer it to a hydraulic press for free forging; Step 3: Process the copper ingot after free forging into a ring to the required size; Step 4: Use a sawing machine to cut the whole ring; Step 5: After heating the cut sections, transfer them to the die forging machine for die forging, and punch out pockets according to the indexing; Step 6: The die-forged product is subjected to a solution + aging heat treatment process to eliminate forging stress and achieve performance enhancement; Step 7: Use a lathe to process the inner and outer diameters and the upper and lower end bosses into finished products; Step 8: Use a CNC milling machine to finish the pocket holes.

[0035] The cutting process in step 1 is to cut the continuous casting billet into a specified size using a sawing machine; The free forging process in step 2 includes heating the raw material ingot to 900±5℃, keeping it warm for 2h, and then using a 3500t hydraulic press to perform roughing and punching, with the initial forging temperature being 900℃ and the final forging temperature being 800℃; In step 3, the ring rolling process starts at a temperature of 850°C, ends at a temperature of 750°C, and has a rolling-expansion ratio of 2.0, and the copper ingot is rolled to the required size; The slitting process in step 4 includes using a sawing machine to slit the ring forging into 10 segments according to 10 equal parts; In step 5, the die preheating temperature of the die forging process is 500°C, the die forging temperature is 750°C, and the pressure is 3000KN; In step 6, the solution temperature of the aging heat treatment process is 650°C, and the aging temperature is 450°C using a water-based quenching liquid for cooling; The turning process in step 7 is used to process Fig. 9 The boss shown; The milling process in step 8 refers to finishing the pocket holes after die forging, including milling, trimming and light filling.

[0036] Large or extra-large copper alloy segmented cages are core components of large equipment such as slewing support bearings. Different from conventional cages, they are large in size, complex in structure, large in size, segmented in assembly, and have very high performance requirements. Using conventional casting methods, the material properties are low, the product defects are many, and the yield is low, so production is difficult.

[0037] The large copper alloy segmented retainer obtained by the forging method of the above-mentioned large copper alloy segmented retainer is further processed by setting free forging, die forging, aging heat treatment and other methods. Repeated heating and forging can eliminate the internal stress of the die casting, improve the strength and toughness of the material, as well as the tensile strength and ductility, etc., to a certain extent, improve the mass production scale and production efficiency, and at the same time, the product quality and material properties can also be significantly improved.

[0038] The above describes an embodiment of the present invention, but this embodiment is not limited to the above-mentioned specific implementation mode. The above-mentioned specific implementation mode is merely illustrative and not restrictive. Under the guidance of this embodiment, ordinary technicians in this field can also make more forms of equivalent embodiments, all of which are protected by this embodiment.

Claims

1. A die-casting device for a copper alloy bearing cage, characterized in that: include: A static die plate (1), a dynamic die plate (2) and a top plate (3), wherein the dynamic die plate (2) is connected to the static die plate (1) via a plurality of hydraulic cylinders A (21), the top plate (3) is fixedly connected to the top of the dynamic die plate (2), and a cavity (11) for forming a bearing retainer is provided on the surface of the static die plate (1); A pressure supply cavity (23) is provided in the movable die plate (2), the top plate (3) is connected to the pressure supply cavity (23) via a pressure supply assembly, a soup supply piece (22) for copper alloy melt to enter is installed on the surface of the movable die plate (2), and a soup channel (221) connected to the pressure supply cavity (23) is provided in the soup supply piece (22); a material leveling assembly, arranged at the bottom of the movable plate (2), and used to evenly distribute the copper alloy melt in the cavity (11), the material leveling assembly comprising an outer positioning block (231) and an inner positioning block (232) fixedly connected to the bottom of the movable plate (2), a movable ring (24) being slidably connected between the outer positioning block (231) and the inner positioning block (232), a surface of the movable ring (24) being provided with a plurality of feeding holes (241) for the melt to pass through, the feeding holes (241) being located between the pressure feeding cavity (23) and the cavity (11), a surface of the inner positioning block (232) being provided with a driving assembly for rotating the movable ring (24), the driving assembly comprising a driving motor (243) fixedly connected to the movable plate (2), an output end of the driving motor (243) being fixedly connected to a driving gear (244), and an inner wall of the movable ring (24) being provided with a plurality of tooth grooves (242) adapted to the driving gear (244); The inner positioning block (232) and the outer positioning block (231) are respectively provided with a side feed groove A (411) and a side feed groove B (442). The side feed groove A (411) and the side feed groove B (442) respectively penetrate the bottom of the inner positioning block (232) and the bottom of the outer positioning block (231), and are respectively arranged at two sides of the inner wall close to the mold cavity (11). The side feed groove A (411) and the side feed groove B (442) are connected to the pressure feeding cavity (23) through an auxiliary component.

2. The die-casting device for a copper alloy bearing cage according to claim 1, characterized in that: The pressure supply assembly comprises a hydraulic cylinder B (31) fixedly connected to the top plate (3), the output shaft of the hydraulic cylinder B (31) facing the side close to the movable plate (2), and fixedly connected to a fixing frame (311), a plurality of punches (312) fixedly connected to the bottom of the fixing frame (311), the lower ends of the punches (312) inserted into the movable plate (2) and extending into the pressure supply cavity (23).

3. The die-casting device for a copper alloy bearing cage according to claim 2, characterized in that: A punch plate (313) adapted to the pressure supply chamber (23) is fixedly connected to the lower end of the punch (312).

4. A die-casting device for a copper alloy bearing cage according to any one of claims 1 to 3, characterized in that: The auxiliary component includes a movable groove and an adjustment groove provided inside the movable template (2), the movable groove intersecting the adjustment groove vertically, one end of the movable groove communicating with the inside of the pressure supply chamber (23), the lower end of the adjustment groove passing through the bottom of the movable template (2), a stopper A (4) slidably connected inside the movable groove, the stopper A (4) being connected to the movable template (2) via a spring (42), the upper end of the side feed groove A (411) passing through the connecting block (233) and the movable template (2) respectively, and communicating with the movable groove, a dividing groove A (41) adapted to the side feed groove A (411) being provided on the surface of the stopper A (4), and a pushing component for pushing the stopper A (4) to extend into the pressure supply chamber (23) being installed in the adjustment groove.

5. The die-casting device for a copper alloy bearing cage according to claim 4, characterized in that: The pushing assembly comprises an adjusting block (432) slidably connected in the adjusting groove, the top of the adjusting block (432) abuts against the stopper A (4), a stepping motor A (43) is fixedly connected in the movable plate (2), a positioning gear (431) is fixedly connected to the output end of the stepping motor A (43), and a tooth groove (242) adapted to the positioning gear (431) is formed on the inner wall of the adjusting block (432).

6. The die-casting device for a copper alloy bearing cage according to claim 5, characterized in that: A photoelectric sensor (433) is fixedly connected to the surface of the adjustment block (432), the photoelectric sensor (433) is directly opposite to the tooth groove (242), and a photoelectric receiver adapted to the photoelectric sensor (433) is provided on the surface of the tooth groove (242).

7. The die-casting device for a copper alloy bearing cage according to claim 4, characterized in that: An auxiliary groove is provided in the movable plate (2), one end of which is connected to the pressure feeding chamber (23) and is arranged opposite to the movable groove. A stopper B (44) is slidably connected in the auxiliary groove. The upper end of the side feed groove B (442) passes through the movable plate (2) and is connected to the inside of the auxiliary groove. A dividing groove B (441) adapted to the side feed groove B (442) is provided in the stopper B (44). A stepper motor B (443) is fixedly connected in the movable plate (2). A synchronous gear is fixedly connected to the output end of the stepper motor B (443). A plurality of gear blocks adapted to the synchronous gear are provided on the surface of the stopper B (44).

8. The die-casting device for a copper alloy bearing cage according to claim 7, characterized in that: A synchronous servo controller is installed in the movable platen (2), and the synchronous servo controller is electrically connected to the stepping motor A (43), the stepping motor B (443) and the photoelectric sensor (433) respectively.

9. A forging method for a large copper alloy segmented cage, applied to a die-casting device for a copper alloy bearing cage according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Use a sawing machine to cut materials according to product specifications; Step 2: Place the raw material ingot in a heating furnace for heating, and then transfer it to a hydraulic press for free forging; Step 3: Process the copper ingot after free forging into a ring to the required size; Step 4: Use a sawing machine to cut the whole ring; Step 5: After heating the cut sections, transfer them to the die forging machine for die forging, and punch out pockets according to the indexing; Step 6: The die-forged product is subjected to a solution + aging heat treatment process to eliminate forging stress and achieve performance enhancement; Step 7: Use a lathe to process the inner and outer diameters and the upper and lower end bosses into finished products; Step 8: Use a CNC milling machine to finish the pocket holes.

10. A forging method for a large copper alloy segmented cage according to claim 9, characterized in that: The free forging process in step 2 includes heating the raw material ingot to 900±5°C, keeping the temperature for 2h, and then using a 3500t hydraulic press to perform roughening and punching, with the initial forging temperature being 900°C and the final forging temperature being 800°C; In step 3, the ring rolling process starts at a temperature of 850° C., ends at a temperature of 750° C., and has a rolling-expansion ratio of 2.0, and the copper ingot is rolled to a required size; The slitting process in step 4 includes using a sawing machine to slit the ring forging into 10 equal parts, thereby cutting the ring forging into 10 segmented parts; In the step 5, the die preheating temperature of the die forging process is 500°C, the die forging temperature is 750°C, and the pressure is 3000KN; The solution temperature of the aging heat treatment process in step 6 is 650°C, and cooling with a water-based quenching liquid is performed, and the aging temperature is 450°C.

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