One-piece molding process for producing intermediate shaft connecting rod

Abstract

The present application relates to an integrated forming process for the production of an intermediate shaft connecting rod, and to the technical field of intermediate shaft cold heading and drawing forming technology, which includes the following steps: S1, firstly, the size of the blank is calculated according to the standard size of the finished connecting rod; S2, cold heading forming, cold heading one end of the blank by a forming device, so that one end of the blank forms the shape of a U-shaped ear plate; S3, drawing forming, clamping the end of the blank that is not larger than the end side of the connecting rod diameter by the forming device in S2, and drawing the blank through the drawing hole until the U-shaped ear plate moves to the drawing hole and stops drawing, at which time the finished connecting rod is formed; S4, milling the U-shaped ear plate to form a connecting hole and performing an appearance inspection on the finished connecting rod formed, and inspecting the forming device if defects occur. The present application has the effect of facilitating the improvement of the service life and strength of the connecting rod, and reducing the influence of stress concentration caused by welding.

Description

Technical Field

[0001] The present application relates to the technical field of intermediate shaft cold heading-drawing forming technology, and in particular to an integrated forming process for intermediate shaft connecting rod production. Background Art

[0002] As a common connecting shaft component in mechanical systems, the intermediate shaft usually transmits torque and speed in the mechanical system. Due to its important role in the transmission system, the mechanical properties and strength properties of the intermediate shaft are subject to extremely high requirements.

[0003] Reference Figure 1 The intermediate shaft includes a connecting rod and a sleeve. The connecting rod 1 is slidably arranged in the sleeve, and one end of the connecting rod is provided with a U-shaped ear plate 11 connected to other shafts, and one end of the sleeve is also provided with a U-shaped ear plate 11. The common production of the intermediate shaft usually includes the following steps: taking the connecting rod as an example, first, the blank is drawn to form a solid cylindrical column 12, and then the other blank is cold headed to form a U-shaped ear plate 11, and finally the end side of the formed column 12 is welded to the U-shaped ear edge 11 to form a connecting rod 1.

[0004] Regarding the above-mentioned related technologies, during the production process, since the column and the U-shaped ear plate are formed in steps and then welded, when the connecting rod is welded, due to the characteristics of the welding itself, whether it is pores, slag inclusions or incomplete penetration, it is easy to cause stress concentration at the weld, which can easily cause fatigue failure at the connection between the column and the U-shaped ear of the connecting rod, affecting the mechanical strength and service life of the connecting rod. Summary of the invention

[0005] In order to improve the service life and strength of the connecting rod and reduce the influence of stress concentration caused by welding, the present application provides an integrated molding process for the production of an intermediate shaft connecting rod.

[0006] The present application provides an integrated molding process for producing an intermediate shaft connecting rod, which adopts the following technical solution:

[0007] An integrated molding process for producing an intermediate shaft connecting rod, comprising: 1. An integrated molding process for producing an intermediate shaft connecting rod, characterized in that it comprises the following steps:

[0008] S1, arranging the blank, firstly calculating the size of the blank according to the standard size of the finished connecting rod, and judging according to the following formula;

[0009]

[0010] (wherein, h3 is the length dimension of the blank, d1 is the length of the cylindrical part in the finished connecting rod, h1 is the diameter of the cylindrical part in the finished connecting rod, d2 is the thickness of the U-shaped clamp in the finished connecting rod, h2 is the length of the U-shaped clamp in the finished connecting rod, D is the standard diameter of the blank, and m is a constant. A constant between 1 and 1.5 is selected according to the elastic modulus of different blank materials. The larger the elastic modulus, the larger the m value, and the smaller the elastic modulus, the smaller the m value). First, the blanks are uniformly cut into fixed sizes, the surface of the blanks is preliminarily cleaned, and the blanks with no segregation and cracks on the surface are selected for production; S2, cold heading, one end of the blank is cold headed by a forming equipment to form a U-shaped ear plate at one end of the blank, and the other end side of the blank is formed into a size not larger than the diameter of the finished connecting rod; S3, drawing, through S2 The forming equipment in the step clamps one end of the blank which is not larger than the end side of the connecting rod diameter, and draws the blank through the drawing hole until the U-shaped ear plate moves to the drawing hole and stops drawing, at which time a finished connecting rod is formed; S4, milling the U-shaped ear plate to form a connecting hole and performing an appearance inspection on the finished connecting rod, checking whether there are cracks at the connection between the U-shaped ear plate and the column, and checking whether there are defects such as lack of meat, excess meat, cracks, etc. on the outer surface of the column, and if defects occur, the forming equipment is inspected; and the forming equipment used in steps S2 and S3 includes a vertically arranged frame, a workbench arranged on the frame, a cold heading assembly arranged on the frame and located on the top side of the workbench, and a drawing assembly arranged on the frame and located on the bottom side of the workbench, and the workbench is also provided with a clamping assembly for clamping the blank;

[0011] The cold heading assembly comprises a cold heading head which is lifted and arranged on the frame, a cold heading die which is arranged on the frame and a lifting member which is used to lift and adjust the cold heading head.

[0012] By adopting the above technical solution, in step S1, the size of the blank is first calculated. Since the subsequent cold heading and drawing are performed on the same equipment, if the size of the blank is shorter, the size of the finished product is smaller, which is not conducive to the normal use of the connecting rod. If the size of the blank is longer, secondary processing and cutting are required after the finished product is formed, which affects the production efficiency of the connecting rod.

[0013] When cold heading is performed in step S2, while the U-shaped ear plate is formed by cold heading, the other end of the blank is cold headed to a size not larger than the diameter of the finished product, so as to facilitate the traction operation when the connecting rod is drawn after the subsequent cold heading, thereby reducing the time consumption from cold heading to drawing and improving the production efficiency of the connecting rod.

[0014] When producing connecting rods, firstly, the blank cut to size is placed on the cold heading die on the workbench, the blank is clamped by the provided clamping assembly, and the cold heading head is lowered by the lifting member to cold head the blank to form a U-shaped ear plate, thus completing the cold heading operation;

[0015] In addition, one end of the blank is cold headed and the other end is drawn by the same forming equipment, so that the connecting rod is formed in one piece, reducing the stress concentration caused by welding, thereby improving the mechanical strength and service life of the connecting rod; at the same time, the production efficiency of the connecting rod is improved, and the time and efficiency problems caused by conventional cold heading and drawing in steps are reduced.

[0016] Optionally, the clamping assembly includes a mounting block arranged on the workbench, the mounting block is provided with a mounting groove, the mounting groove is connected with the cold heading die, the blank is placed in the mounting groove, and a connecting hole is provided on the inner bottom wall of the mounting groove. The clamping assembly also includes a limit block arranged on the bottom side of the workbench, the limit block is provided with a limit groove connected with the connecting hole, the limit groove is connected with the connecting hole, the limit groove smoothly transitions from an end close to the connecting hole to an end away from the connecting hole, the side of the limit groove away from the cold heading head is closed, and the frame is also provided with a power part for moving the workbench toward the direction close to the cold heading head when the cold heading head descends.

[0017] By adopting the above technical solution, after the technicians place the blank vertically in the installation groove, since the installation groove is connected to the cold heading mold at this time, the installation block is connected to the cold heading mold at this time, and the limit block is set, the limit groove is opened on the limit block, because the limit groove smoothly transitions from the direction close to the installation groove to the direction away from the installation groove, during cold heading, the bottom end of the blank with a U-shaped ear plate formed after cold heading also presents a smooth transition, so that during subsequent drawing, when the blank undergoes plastic deformation, the metal tissue fiber line will not be seriously displaced, so that the plastic deformation of each partial cylinder is uniform, thereby controlling the displacement of the metal fiber tissue, and making the strength of the connecting rod finally formed uniform.

[0018] By setting a detachable limit block, during cold heading, the limit block is always installed on the mounting block to ensure the quality of cold heading. During drawing, the limit block is removed and then subsequent drawing is carried out, which is convenient for subsequent drawing steps.

[0019] Furthermore, when cold forging is performed by the arranged power part, while the cold forging head moves toward the workbench, the workbench moves toward the cold forging head, thereby reducing the stroke amount during the cold forging process and reducing the occupied space of the equipment.

[0020] Optionally, the power part includes a lifting rack arranged on the frame, the lifting rack is connected to the cold heading head, a sliding rack is provided on the workbench, the sliding rack is slidably arranged on the frame, a sliding gear is provided on the frame, the lifting rack and the sliding rack are both engaged with the sliding gear, when the cold heading head descends, the lifting rack descends to drive the sliding gear to rotate, thereby driving the sliding rack to slide, thereby realizing the sliding of the workbench, so that the workbench moves in a direction close to the cold heading head.

[0021] By adopting the above technical solution, during the descent of the cold heading head, the cold heading head drives the lifting rack to rise and fall, the lifting rack drives the sliding gear to rotate, and the sliding gear drives the sliding rack to slide, thereby driving the workbench to move in the direction close to the cold heading head to achieve cold heading of the blank. At the same time, after the cold heading is completed, during the ascent of the cold heading head, the workbench moves toward the direction of the drawing assembly to facilitate subsequent drawing operations.

[0022] Optionally, the drawing assembly includes a lifting drawing head arranged on the frame, a drawing table arranged on the frame, a cooling part arranged on the workbench and a lubricating part arranged on the frame. The drawing table is provided with a drawing hole for the blank to pass through. The drawing head clamps the end side of the blank away from the cold heading head. The cooling part includes a cooling box arranged on the frame. The mounting block is provided with a cooling pipe connected to the cooling box. The cooling pipe is arranged on the mounting block and is arranged around the mounting groove. The frame is also provided with a circulation part for circulating the coolant in the cooling box in the cooling pipe.

[0023] By adopting the above technical solution, when drawing is required after cold heading is completed, the circulating part will use the cooling water in the water tank to cool the blank in the mounting block through the cooling pipe, thereby reducing the problem of uneven movement of metal fibers during subsequent drawing caused by temperature influence, so that the performance of the connecting rod obtained after drawing is uniform.

[0024] After the cold heading is completed, during the rising process of the cold heading head, the worktable moves toward the drawing table under the action of the power part, so that one end of the blank passes through the drawing hole. During the drawing, the drawing head clamps the end of the blank that passes through the drawing hole, so that the blank passes through the drawing hole to achieve the drawing of the blank. At the same time, during the drawing process, the worktable always moves in the direction close to the drawing table until the drawing table and the worktable are in contact, and the drawing work is completed.

[0025] At the same time, the lubricating parts are provided to lubricate the outer wall of the blank during the drawing process, thereby reducing the problems of lack of meat, insufficient meat or wire drawing caused by the friction between the drawing table and the blank during the drawing process, thereby improving the finished product quality of the connecting rod.

[0026] Optionally, the lubricating member comprises a lubricating ring arranged on the drawing table, the lubricating ring is hollow, and lubricating oil is stored in the cavity of the lubricating ring, the lubricating ring is sleeved on the blank, and lubricating holes are opened on the inner circumferential wall of the lubricating ring, the lubricating holes are provided in a plurality of groups, and the plurality of groups of lubricating holes are evenly spaced along the circumferential direction of the inner circumferential wall of the lubricating ring, and a sealing plate is slidably arranged at the lubricating hole, and the sealing plate adjusts the opening of the lubricating hole, and the lubricating ring is provided with an adjusting member for adjusting the sealing plate;

[0027] When the lubrication ring is close to the U-shaped ear plate, the adjustment member enlarges the opening of the lubrication hole, and when the temperature of the drawing table increases, the adjustment member increases the flow rate of the cooling water in the cooling pipe.

[0028] By adopting the above technical scheme, since both cold heading and drawing involve plastic deformation of the metal, thereby generating high heat, and since cold heading and drawing are formed in one piece in this scheme, in order to reduce the influence of the high heat generated by cold heading on the drawing process, in addition to cooling the mounting block through the circulation part to reduce the temperature of the blank, the surface of the blank is coated with lubricating oil through the provided lubrication ring. Since the heat generated by cold heading is equivalent to the low temperature range of drawing, that is, between 100°C and 200°C, and the closer the blank is to the workbench, the higher the temperature of the blank, the lubricating oil not only lubricates but also cools the blank, thereby reducing the damage caused by the temperature of the drawing table.

[0029] Therefore, during the drawing process, when the workbench moves toward the drawing table, the temperature of the blank becomes higher and higher. Under the action of the adjusting part, the lubricating oil in the lubricating ring is squeezed out from the lubricating hole to lubricate the outer surface of the blank. The closer the workbench is to the drawing table, the smaller the opening of the lubricating hole is blocked by the sealing plate, and the larger the opening of the lubricating hole is. At the same time, when the temperature is higher, the pressure in the lubricating ring is greater, which makes it easier to squeeze the lubricating oil in the lubricating ring out of the lubricating hole to heat the surface of the blank.

[0030] Optionally, a fixing groove is formed on a side of the mounting block close to the pulling head, the limiting block is embedded and installed in the fixing groove, and one of the lubrication ring and the limiting block is movably embedded in the fixing groove.

[0031] By adopting the above technical solution, when cold heading is performed, the limit block is embedded in the fixed groove, which is convenient for the stability of cold heading. After the cold heading is completed, the technician will remove the limit block and perform the drawing operation. During the drawing process, the workbench always moves in the direction of the drawing table until the lubrication ring is embedded in the fixed groove, thereby reducing the influence of the thickness of the lubrication ring on the drawing process, thereby improving the dimensional accuracy in the subsequent drawing process.

[0032] Optionally, the adjusting member includes an adjusting block connected to the sealing plate, wherein one end of the adjusting block away from the drawing head protrudes from the surface of the lubrication ring, and the protruding end of the adjusting block is movably fitted with a side of the workbench close to the drawing head, and a sealing hole connected to the lubrication hole is provided on the sealing plate, and when the adjusting block is immersed in the lubrication ring, the sealing hole is completely connected with the lubrication hole.

[0033] By adopting the above technical solution, during the drawing process, the closer the workbench is to the drawing table, the higher the temperature is, and the more lubricating oil is needed to cool the blank. Therefore, when the workbench is close to the drawing table, the workbench presses the adjusting block tightly, so that the adjusting block drives the sealing plate to slide in the lubrication hole, so that the overlapping area of ​​the lubrication hole and the sealing hole gradually increases, thereby increasing the extrusion amount of lubricating oil and improving the cooling efficiency of the blank.

[0034] Optionally, the cooling pipe is arranged on the drawing table and around the drawing hole. The drawing table is provided with an adjustment hole connected to the cooling pipe. The adjustment member also includes a sliding plate slidably arranged in the adjustment hole. The sliding plate is provided with a water hole connected to the adjustment hole. When the water hole is completely corresponding to the adjustment hole, the cooling water flow rate in the cooling pipe is the largest.

[0035] By adopting the above technical solution, during the cooling process, since cold heading or drawing is not performed, cooling is not required at this time. At this time, the water holes of the sliding plate do not correspond to the adjustment holes, and thus the drawing table is not cooled. When drawing or cold heading is performed, the drawing table and the workbench need to be cooled. When the sliding plate slides on the drawing table, the water holes and the adjustment holes slide to correspond. At this time, the water flow rate in the cooling pipe changes with the overlapping area of ​​the water holes and the adjustment holes.

[0036] Optionally, the adjusting member also includes a first adjusting capsule arranged in the drawing table, wherein the first adjusting capsule contains a temperature-sensitive material whose volume changes with temperature. The higher the temperature, the larger the volume of the first adjusting capsule. Meanwhile, the first adjusting capsule is made of elastic material, and the first adjusting capsule is movably fitted and tightly pressed against the sliding plate.

[0037] By adopting the above technical solution, since the first regulating bag is arranged in the drawing table, when heat is generated during the drawing process, the heat is transferred to the first regulating bag, causing the temperature-sensitive material to change in volume. At this time, the volume change generated by the first regulating bag presses against the sliding plate to slide, thereby realizing the adjustment of the overlapping area between the water hole and the regulating hole, thereby realizing the rate and efficiency of circulating water cooling at different temperatures.

[0038] Optionally, a second regulating bag is further provided in the drawing table, in which a temperature-sensitive material whose volume changes with temperature is stored. The higher the temperature, the larger the volume of the second regulating bag. A pressure plate is slidably arranged in the lubrication ring, and the pressure plate is in contact with the inner wall of the lubrication ring cavity.

[0039] By adopting the above technical solution, when the temperature of the drawing table increases, the temperature of the second regulating bag increases, thereby causing a volume change. At this time, the second regulating bag slides against the pressure plate, so that when the temperature is higher, the amount of lubricating oil extruded increases, thereby increasing the thickness of the lubricating oil on the surface of the blank and improving the cooling efficiency of the blank.

[0040] In summary, the present application includes at least one of the following beneficial technical effects:

[0041] 1. The cold heading assembly, drawing assembly and workbench arranged on the frame make it easy to cold head and draw the blank through the same equipment, reducing the time and efficiency problems caused by cold heading and drawing in steps. At the same time, welding is not required, reducing stress concentration and fatigue caused by welding;

[0042] 2. Through the provided mounting block and the stopper block detachably provided on the mounting block, the blank is deformed in the mounting groove of the mounting block during the cold forging process to achieve cold forging. At the same time, the provided stopper block facilitates the formation of a drawing head with a smaller diameter after the cold forging is completed, which is convenient for subsequent drawing operations;

[0043] 3. Through the lubrication ring, cooling pipe and adjusting parts, during the cold heading and drawing process, the lubrication ring lubricates and cools the blank that needs to be deformed, and the cooling pipe cools the blank after cold heading, thereby reducing the influence of the high temperature generated by cold heading on the drawing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of the blank processing of the embodiment of the present application;

[0045] Figure 2 It is a schematic diagram of the overall structure of the molding equipment used in the embodiment of the present application;

[0046] Figure 3 It is a schematic diagram of the internal connection structure of the molding equipment;

[0047] Figure 4 yes Figure 3 Schematic diagram of the local structure of part A;

[0048] Figure 5 This is a schematic diagram of the state where cold heading ends and drawing begins;

[0049] Figure 6 This is a schematic diagram of the state at the end of drawing.

[0050] Figure numerals: 1, connecting rod; 11, U-shaped ear plate; 12, column; 13, blank; 2, frame; 21, workbench; 3, cold heading assembly; 31, cold heading head; 32, cold heading die; 33, lifting member; 34, clamping assembly; 341, mounting block; 342, mounting groove; 343, limit block; 344, limit groove; 35, power member; 351, lifting rack; 352, sliding rack; 353, sliding rack; 4, drawing assembly; 41, drawing table; 411. Drawing hole; 42. Drawing head; 43. Cooling part; 431. Cooling box; 432. Cooling pipe; 44. Circulating part; 45. Lubricating part; 451. Lubricating ring; 452. Lubricating cavity; 453. Lubricating hole; 454. Sealing plate; 455. Sealing hole; 46. Adjusting part; 461. Adjusting block; 462. Adjusting hole; 463. Sliding plate; 464. Water hole; 465. First adjusting bag; 466. Second adjusting bag; 467. Pressurizing plate. DETAILED DESCRIPTION

[0051] The following is combined with Figure 1-6 This application is described in further detail.

[0052] The embodiment of the present application discloses an integrated molding process for producing an intermediate shaft connecting rod 1. Figure 1 , an integrated molding process for producing an intermediate shaft connecting rod 1 comprises the following steps:

[0053] S1, arranging the blank 13, firstly calculating the size of the blank 13 according to the standard size of the finished connecting rod 1, and judging according to the following formula:

[0054]

[0055] (wherein, h3 is the length dimension of the blank 13, d1 is the length of the cylindrical part in the finished connecting rod 1, h1 is the diameter of the cylindrical part in the finished connecting rod 1, d2 is the thickness of the U-shaped clamp in the finished connecting rod 1, h2 is the length of the U-shaped clamp in the finished connecting rod 1, D is the standard diameter of the blank 13, and m is a constant, which is selected between 1 and 1.5 according to the elastic modulus of different materials of the blank 13. The larger the elastic modulus, the larger the m value, and the smaller the elastic modulus, the smaller the m value). First, the blanks 13 are uniformly cut into fixed sizes, the surfaces of the blanks 13 are preliminarily cleaned, and the blanks 13 with no surface segregation and cracks are selected for production;

[0056] S2, cold heading forming, cold heading one end of the blank 13 by a forming device, so that one end of the blank 13 is formed into the shape of a U-shaped ear plate 11, and the other end side of the blank 13 is formed into a size not greater than the diameter of the finished connecting rod 1;

[0057] S3, drawing and forming, the forming equipment in S2 clamps the end of the blank 13 which is not larger than the diameter of the connecting rod 1, and draws the blank 13 through the drawing hole 411 until the U-shaped ear plate 11 moves to the drawing hole 411 and stops drawing, at which time the finished connecting rod 1 is formed;

[0058] S4, milling the U-shaped ear plate 11 to form a connecting hole and performing an appearance inspection on the finished connecting rod 1, checking whether there are cracks at the connection between the U-shaped ear plate 11 and the column 12, and checking whether there are defects such as lack of meat, excess meat, cracks, etc. on the outer surface of the column 12. If defects are found, the molding equipment is inspected.

[0059] At the same time, for the above-mentioned molding process, the present application also proposes a molding device applied to the one-piece molding process, referring to Figure 2 and Figure 3 The forming equipment includes a vertically arranged frame 2, on which a cold heading assembly 3, a workbench 21 and a drawing assembly 4 are arranged in sequence from top to bottom along the height direction.

[0060] The workbench 21 is provided with a clamping assembly 34, and a mounting hole is provided on the workbench 21. The clamping assembly 34 includes a mounting block 341 embedded and fixed in the mounting hole, and a mounting groove 342 corresponding to the shape of the U-shaped ear plate 11 is provided in the mounting block 341. A limit block 343 is detachably provided at the bottom of the mounting block 341, and a limit groove 344 is provided on the limit block 343. A connecting hole connected to the limit groove 344 is provided on the inner bottom wall of the mounting groove 342, and the inner side wall of the limit groove 344 is formed by a hole near the mounting hole. The direction of the installation groove 342 smoothly transitions toward the direction away from the installation groove 342, and the side of the limiting groove 344 away from the installation groove 342 is closed, and the diameter of the side of the limiting groove 344 away from the installation groove 342 is smaller than the diameter of the end of the finished column 12 of the connecting rod 1, so that during cold heading, the blank 13 undergoes plastic deformation in the installation groove 342 and the limiting groove 344, so that the blank 13 in the installation groove 342 forms the shape of the U-shaped ear plate 11, and the blank 13 in the limiting groove 344 forms a shape that is convenient for subsequent drawing. A fixing groove is provided on the bottom side of the mounting block 341, and the fixing groove is annular, and the limiting block 343 is movably inserted into the fixing groove, and the limiting block 343 is fixed to the mounting block 341 by a corner bolt.

[0061] The cold heading assembly 3 includes a cold heading head 31, a cold heading die 32 and a lifting member 33 for lifting and lowering the cold heading head 31, which are lifted and arranged on the frame 2. In the present application, in order to save space and because the functions of the cold heading die 32, the workbench 21 and the mounting block 341 are consistent, the cold heading die 32 is lifted and arranged. In other embodiments, when the size of the U-shaped ear plate 11 is large and the workbench 21 is not convenient for direct forming, the cold heading die 32 can be arranged on the frame 2 above the workbench 21, and the mounting groove 342 of the mounting block 341 is connected to the die hole of the cold heading die 32.

[0062] The cold heading head 31 is in the shape of a T-shaped block that matches the shape of the mounting block 341 and the mounting groove 342, and the cold heading head 31 is directly opposite to the mounting groove 342. In this application, the lifting component 33 is a hydraulic cylinder, and the frame 2 is also provided with a power component 35 for making the cold heading head 31 and the workbench 21 synchronously approach / move away.

[0063] Reference Figure 2 and Figure 3 The power member 35 includes a lifting rack 351 slidably set on the frame 2 and a sliding rack 352 slidably set on the frame 2. The sliding directions of the lifting rack 351 and the sliding rack 352 are consistent with the height direction of the frame 2, and the lifting rack 351 is connected to the cold heading head 31, and the sliding rack 352 is connected to the workbench 21. A sliding gear 353 is rotatably set on the frame 2, and the sliding rack 352 and the lifting rack 351 are both engaged with the sliding gear 353, and the sliding rack 352 and the lifting rack 351 are located on opposite sides of the sliding gear 353, so that the sliding rack 352 and the lifting rack 351 produce movements in opposite directions.

[0064] During the descent of the cold heading head 31, the cold heading head 31 drives the lifting rack 351 to rise and fall, the lifting rack 351 drives the sliding gear 353 to rotate, and the sliding gear 353 drives the sliding rack 352 to slide, thereby driving the workbench 21 to move toward the cold heading head 31 to achieve cold heading of the blank 13. At the same time, after the cold heading is completed, during the ascent of the cold heading head 31, the workbench 21 moves toward the direction of the drawing assembly 4 to facilitate the subsequent drawing operation.

[0065] The drawing assembly 4 includes a drawing head 42 which is lifted and lowered on the frame 2, a drawing table 41 which is arranged on the frame 2, and a driving member which is arranged on the frame 2 and lifts and lowers the drawing head 42. A drawing hole 411 is provided on the drawing table 41. The end of the cold-forged blank 13 away from the U-shaped ear plate 11 movably passes through the drawing hole 411. After the cold forging is completed, the technician removes the limit block 343 to expose the end of the blank 13 away from the U-shaped ear plate 11. At this time, the cold-forging head 31 is rising, and the workbench 21 descends, so that the blank 13 passes through the drawing hole 411 until one end of the blank 13 is located in a position convenient for clamping by the drawing head 42. It should be noted that the drawing head 42 in the present application is in the form of a conventional three-jaw chuck, and the driving member is also in the form of a hydraulic cylinder.

[0066] At the same time, since high heat will be generated when the metal undergoes plastic deformation, whether it is cold heading or drawing, the high heat will reduce the service life of the mold, and when the blank 13 is drawn at high temperature, wire drawing or lack of meat is likely to appear on the surface, affecting the quality of the finished connecting rod 1. Therefore, in order to improve this problem, the drawing assembly 4 also includes a cooling member 43 for cooling the workbench 21 and the drawing table 41. The cooling member 43 includes a cooling box 431 provided on the frame 2, and a coolant is stored in the cooling box 431. A cooling pipe 432 is connected to the cooling box 431. A portion of the cooling pipe 432 is buried in the mounting block 341 and arranged around the mounting groove 342. This portion of the cooling pipe 432 cools the blank 13 or the U-shaped ear plate 11 in the mounting groove 342. Another portion of the cooling pipe 432 is buried in the drawing table 41 and arranged around the drawing hole 411. A circulation component 44 is also provided on the cooling box 431. The circulation component 44 is used to squeeze the coolant in the cooling box 431 into the cooling pipe 432 to cool the workbench 21 and the drawing table 41. In this application, the circulation component 44 is a water pump.

[0067] At the same time, in order to reduce the lack of meat on the surface of the connecting rod 1, a lubricating part 45 is also provided on the frame 2. The lubricating part 45 includes a lubricating ring 451 arranged on the drawing table 41. The lubricating ring 451 is movably sleeved on the blank 13, and a lubricating hole 453 is opened on the inner circumferential wall of the lubricating ring 451. There are multiple groups of lubricating holes 453, and the multiple groups of lubricating holes 453 are evenly spaced along the inner circumferential wall of the lubricating ring 451. A lubricating cavity 452 is provided in the lubricating ring 451, and lubricating oil is stored in the lubricating cavity 452. The lubricating oil flows out of the lubricating hole 453 to lubricate and cool the surface of the blank 13, thereby reducing the friction when the blank 13 passes through the drawing hole 411. At the same time, the top side of the lubricating ring 451 is movably inserted into the fixed groove.

[0068] When drawing is performed after cold heading, the temperature of the blank 13 near the cold heading head is higher than the temperature of the blank 13 far from the cold heading head 31. When drawing is performed at different temperatures, uneven performance is likely to occur. Therefore, the blank 13 needs to be cooled and lubricated to different degrees at different temperatures. To achieve this purpose, an adjusting member 46 is further provided on the frame 2. When the lubrication ring 451 is close to the U-shaped ear plate 11, the adjusting member 46 enlarges the opening of the lubrication hole 453. When the temperature of the drawing table 41 increases, the adjusting member 46 increases the flow rate of the cooling water in the cooling pipe 432.

[0069] Reference Figure 3 and Figure 4 A sealing plate 454 is slidably provided at the lubrication hole 453, and the sealing plate 454 slides along the height direction of the frame 2. A sealing hole 455 is opened on the sealing plate 454, and the sealing hole 455 is movably connected with the lubrication hole 453. The adjusting member 46 includes an adjusting block 461 connected to the sealing plate 454, and the top side of the lubrication ring 451 is movably fitted with the bottom side of the workbench 21, so the top side of the adjusting block 461 is movably fitted and tightly pressed against the bottom side of the workbench 21. Therefore, during the drawing process, when the workbench 21 moves toward the drawing table 41, the workbench 21 presses against the adjusting block 461 to move, thereby changing the overlapping area of ​​the sealing hole 455 and the lubrication hole 453, and when the lubrication ring 451 is fitted with the bottom side of the workbench 21, the sealing hole 455 is fully connected with the lubrication hole 453, so that the maximum discharge of lubricating oil is achieved at this time.

[0070] At the same time, a pressure plate 467 is slidably arranged in the lubricating cavity 452, and the pressure plate 467 is fitted with the inner wall of the lubricating cavity 452. A second regulating capsule 466 is buried in the drawing table 41, and a liquid of a temperature-sensitive material is stored in the second regulating capsule 466. The second regulating capsule 466 is an expandable material, and the second regulating capsule 466 is fitted with the pressure plate 467. The liquid in the second regulating capsule 466 is alcohol, ether, acetone, chloroform, etc., which has a low boiling point and a high gasification volume expansion ratio. Therefore, when the temperature of the drawing table 41 rises and the workbench 21 moves toward the direction of fitting the drawing table 41, the liquid in the second regulating capsule 466 is gasified and expanded, thereby pressing against the sliding of the pressure plate 467, and squeezing the lubricating oil out of the lubricating hole 453, so that as the temperature rises, the discharge amount of the lubricating oil gradually increases.

[0071] Furthermore, when cold heading and drawing are not performed, the cooling efficiency requirement for the cooling pipe 432 is low. When cold heading or drawing is performed, the cooling efficiency requirement for the cooling pipe 432 is high. An adjustment hole 462 is provided at the connection point of the cooling pipe 432 on the drawing table 41. The adjustment member 46 includes a sliding plate 463 slidably arranged on the drawing table 41. The sliding plate 463 is provided with a water hole 464 movably connected to the adjustment hole 462, and the overlapping area between the water hole 464 and the adjustment hole 462 is adjusted with temperature changes.

[0072] A first regulating capsule 465 is provided on the drawing table 41. The first regulating capsule 465 contains a temperature-sensitive material that is the same as that in the second regulating capsule 466, and the first regulating capsule 465 is in contact with the end side of the sliding plate 463. When the temperature rises, the first regulating capsule 465 expands to press against the sliding plate 463 to slide, thereby adjusting the flow rate of the coolant in the cooling tube 432.

[0073] The implementation principle of the one-piece forming process for producing an intermediate shaft connecting rod 1 in the embodiment of the present application is as follows: when producing the connecting rod 1 through the above process, the technician first cuts the blank 13 into a suitable size, and then places the blank 13 in the mounting groove 342. At this time, the mounting groove 342 of the mounting block 341 clamps the blank 13. At this time, the cold heading head 31 descends, and synchronously drives the workbench 21 and the mounting block 341 to rise, and cold heads one end of the blank 13 to form the shape of a U-shaped ear plate 11. Then, after the cold heading is completed, the technician removes the limit block 343. At this time, the cold heading head 31 rises, driving the workbench 21 to descend until one end of the cold-headed blank 13 passes through the drawing hole 411. At this time, one end of the blank 13 is drawn by the provided drawing head 42 until the bottom side of the workbench 21 fits with the upper surface of the lubrication ring 451, thereby realizing the production of the connecting rod 1.

[0074] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An integrated molding process for producing an intermediate shaft connecting rod, characterized in that: The steps include: S1, arranging the blank (13), firstly calculating the size of the blank (13) according to the standard size of the finished connecting rod (1), and judging according to the following formula: ， (wherein, h3 is the length dimension of the blank (13), d1 is the diameter of the column (12) in the finished connecting rod (1), h1 is the length of the column (12) in the finished connecting rod (1), d2 is the thickness of the U-shaped ear plate (11) in the finished connecting rod (1), h2 is the length of the U-shaped ear plate (11) in the finished connecting rod (1), D is the standard diameter of the blank (13), and m is a constant, which is selected between 1 and 1.5 according to the elastic modulus of different blank (13) materials. The larger the elastic modulus, the larger the m value, and the smaller the elastic modulus, the smaller the m value). First, the blank (13) is uniformly cut into a fixed size, the surface of the blank (13) is preliminarily cleaned, and the blank (13) with no surface segregation and no cracks is selected for production; S2, cold heading forming, cold heading one end of the blank (13) by means of a forming device, so that one end of the blank (13) is formed into the shape of a U-shaped ear plate (11), and the other end side of the blank (13) is formed into a size not greater than the diameter of the column of the finished connecting rod (1); S3, drawing and forming, clamping one end of the blank (13) which is not larger than the diameter of the connecting rod (1) by the forming equipment in S2, and making the blank (13) pass through the drawing hole (411) to draw the blank (13) until the U-shaped ear plate (11) moves to the drawing hole (411) and stops drawing, at which time a finished connecting rod (1) is formed; S4, milling the U-shaped ear plate (11) to form a connection hole and performing an appearance inspection on the finished connecting rod (1), inspecting whether there are cracks at the connection between the U-shaped ear plate (11) and the column (12), and inspecting whether there are defects such as lack of meat, excess meat, cracks, etc. on the outer surface of the column (12). If defects are found, inspect the molding equipment; The forming equipment used in steps S2 and S3 comprises a vertically arranged frame (2), a workbench (21) arranged on the frame (2), a cold heading assembly (3) arranged on the frame (2) and located on the top side of the workbench (21), and a drawing assembly (4) arranged on the frame (2) and located on the bottom side of the workbench (21); the workbench (21) is also provided with a clamping assembly (34) for clamping the blank (13); The cold heading assembly (3) comprises a cold heading head (31) which is lifted and arranged on the frame (2), a cold heading die (32) which is arranged on the frame (2), and a lifting member (33) which is used to lift and adjust the cold heading head (31); The clamping assembly (34) comprises a mounting block (341) disposed on the workbench (21), the mounting block (341) being provided with a mounting groove (342), the mounting groove (342) being connected to the cold heading die (32), the blank (13) being placed in the mounting groove (342), the inner bottom wall of the mounting groove (342) being provided with a connecting hole, the clamping assembly (34) further comprising a limit block (343) disposed on the bottom side of the workbench (21), the limit block (343) being detachably disposed on the mounting block (341), the limit block (343) being provided with a connecting hole connected to the connecting hole. a limiting groove (344) connected to the through hole, the limiting groove (344) being connected to the connecting hole, the diameter of the limiting groove (344) on the side away from the mounting groove (342) being smaller than the diameter of the columnar portion of the finished connecting rod (1), the limiting groove (344) smoothly transitioning from the end close to the connecting hole toward the end away from the connecting hole, the side of the limiting groove (344) away from the cold heading head (31) being in a closed shape, and a power part (35) for moving the workbench (21) in a direction close to the cold heading head (31) when the cold heading head (31) is lowered, on the frame (2); At the same time, after the cold heading is completed, during the process of the cold heading head (31) rising, the workbench (21) moves towards the direction of the drawing assembly (4), so as to facilitate the subsequent drawing operation.

2. The one-piece molding process for producing an intermediate shaft connecting rod according to claim 1, characterized in that: The power member (35) comprises a lifting rack (351) arranged on the frame (2), the lifting rack (351) being connected to the cold heading head (31), a sliding rack (352) being arranged on the workbench (21), the sliding rack (352) being slidably arranged on the frame (2), a sliding gear (353) being arranged on the frame (2), the lifting rack (351) and the sliding rack (352) both being meshed with the sliding gear (353), when the cold heading head (31) descends, the lifting rack (351) descends to drive the sliding gear (353) to rotate, thereby driving the sliding rack (352) to slide, thereby realizing the sliding of the workbench (21), so that the workbench (21) moves in a direction close to the cold heading head (31).

3. The one-piece molding process for producing an intermediate shaft connecting rod according to claim 2, characterized in that: The drawing assembly (4) comprises a drawing head (42) which is lifted and disposed on the frame (2), a drawing table (41) disposed on the frame (2), a cooling member (43) disposed on the workbench (21), and a lubricating member (45) disposed on the frame (2), wherein a drawing hole (411) is provided on the drawing table (41) for the blank (13) to pass through, and the drawing head (42) clamps the end side of the blank (13) away from the cold heading head (31). The cooling member (43) comprises a cooling box (431) arranged on the frame (2); a cooling pipe (432) connected to the cooling box (431) is arranged on the mounting block (341); a portion of the cooling pipe (432) is arranged on the mounting block (341) and is arranged around the mounting groove (342); and a circulation member (44) for circulating the coolant in the cooling box (431) in the cooling pipe (432) is also arranged on the frame (2).

4. The one-piece molding process for producing an intermediate shaft connecting rod according to claim 3, characterized in that: The lubricating member (45) comprises a lubricating ring (451) arranged on the drawing table (41); the lubricating ring (451) is hollow and lubricating oil is stored in the cavity of the lubricating ring (451); the lubricating ring (451) is sleeved on the blank (13); and lubricating holes (453) are opened on the inner circumferential wall of the lubricating ring (451); a plurality of groups of lubricating holes (453) are arranged evenly spaced along the circumferential direction of the inner circumferential wall of the lubricating ring (451); and a sealing plate (454) is slidably arranged at the lubricating hole (453); the sealing plate (454) adjusts the opening of the lubricating hole (453); and an adjusting member (46) for adjusting the sealing plate (454) is provided on the lubricating ring (451); When the lubrication ring (451) is close to the U-shaped ear plate (11), the adjustment member (46) enlarges the opening of the lubrication hole (453); when the temperature of the drawing table (41) increases, the adjustment member (46) increases the flow rate of the cooling water in the cooling pipe (432).

5. The one-piece molding process for producing an intermediate shaft connecting rod according to claim 4, characterized in that: A fixing groove is provided on a side of the mounting block (341) close to the pulling head (42), the limiting block (343) is embedded in the fixing groove, and one of the lubricating ring (451) and the limiting block (343) is movably embedded in the fixing groove.

6. The one-piece molding process for producing an intermediate shaft connecting rod according to claim 5, characterized in that: The adjusting member (46) comprises an adjusting block (461) connected to the sealing plate (454); one end of the adjusting block (461) away from the drawing head (42) protrudes from the surface of the lubricating ring (451); the protruding end of the adjusting block (461) is movably fitted with a side of the workbench (21) close to the drawing head (42); a sealing hole (455) connected to the lubricating hole (453) is formed on the sealing plate (454); and when the adjusting block (461) is immersed in the lubricating ring (451), the sealing hole (455) is completely connected to the lubricating hole (453).

7. The one-piece molding process for producing an intermediate shaft connecting rod according to claim 6, characterized in that: Another part of the cooling pipe (432) is arranged on the drawing table (41) and is arranged around the drawing hole (411). The drawing table (41) is provided with an adjustment hole (462) connected to the cooling pipe (432). The adjustment member (46) also includes a sliding plate (463) slidably arranged in the adjustment hole (462). The sliding plate (463) is provided with a water hole (464) connected to the adjustment hole (462). When the water hole (464) is completely corresponding to the adjustment hole (462), the cooling water flow rate in the cooling pipe (432) is at its maximum.

8. The one-piece molding process for producing an intermediate shaft connecting rod according to claim 7, characterized in that: The adjusting member (46) further comprises a first adjusting capsule (465) disposed in the drawing platform (41), wherein the first adjusting capsule (465) contains a temperature-sensitive material that changes in volume with temperature. The higher the temperature, the larger the volume of the first adjusting capsule (465). The first adjusting capsule (465) is made of an elastic material, and the first adjusting capsule (465) is movably fitted and tightly pressed against the sliding plate (463).

9. The one-piece molding process for producing an intermediate shaft connecting rod according to claim 8, characterized in that: The drawing table (41) is also provided with a second regulating capsule (466), in which a temperature-sensitive material whose volume changes with temperature is stored. The higher the temperature, the larger the volume of the second regulating capsule (466). A pressure plate (467) is slidably provided in the lubricating ring (451), and the pressure plate (467) is in contact with the inner wall of the cavity of the lubricating ring (451).

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