A forming method and post-processing system for tension spring swing arm forging

Abstract

The present invention relates to the field of die forging, and specifically to a forming method for a tension spring swing arm forging. The method comprises the following steps: S1, forging a blank into a forging; S2, post-processing the forging: S2a, mounting the forging on an anti-drop hook through a hole formed in the forging, the anti-drop hook having an annular structure that can be opened and closed, and the annular structure passes through the hole of the forging; S2b, installing a plurality of anti-drop hooks mounted with forgings on a dense hanger, the anti-drop hooks being closely arranged on the dense hanger; S2c, moving the dense hanger so that the forgings mounted thereon are sequentially subjected to etching, solution treatment, aging and acid-base polishing treatment. The present invention also relates to a post-processing system for tension spring swing arm forgings. The present application uses a dense hanger to move a plurality of forgings mounted thereon as a whole, which can reduce the steps of assembling and disassembling the hooks several times, thereby greatly reducing the post-processing time of the forgings. The present invention also relates to a post-processing system for tension spring swing arm forgings.

Description

Technical Field

[0001] The present invention relates to the field of die forging, and in particular to a forming method of a tension spring swing arm forging. The present invention also relates to a post-processing system of the tension spring swing arm forging. Background Art

[0002] The existing tension spring swing arm manufacturing has problems such as low material utilization, sand holes, many pores, coarse grains, discontinuous metal fibers, mechanical properties inferior to forgings, and poor product fatigue resistance. At the same time, the fatigue resistance, tensile strength and other properties of the tension spring swing arm manufactured by this method cannot meet the requirements.

[0003] Compared with casting, die forging can solve such problems. Using die forging method to process such parts can solve the existing problems, and the performance of the product is far greater than that of casting products.

[0004] However, the existing die forging method is complicated and has many processes, especially the post-processing process. After the forging is formed, it needs to be washed, solid solution, aged, acid-base polished and shot blasted. The existing method is to mount the forgings on the racks of etching and washing equipment, solid solution equipment, aging equipment, acid-base polished equipment and shot blasting equipment in sequence, which requires the forgings to be repeatedly removed and hung, resulting in a lot of repetitive work and a great waste of labor.

[0005] If you want to use automated equipment to fully automatically install and remove forgings on the rack, you need to design corresponding automated equipment for each shape of forging, which is very costly. Summary of the invention

[0006] The object of the present invention is to provide a forming method and a post-processing system for a tension spring swing arm forging, so as to solve the technical problem of low working efficiency of existing die forging equipment.

[0007] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0008] A method for forming a tension spring swing arm forging comprises the following steps:

[0009] S1, forging the blank into a forging; S2, post-processing the forging: S2a, mounting the forging on an anti-slip hook through a hole formed in the forging, wherein the anti-slip hook has an openable and closable annular structure, and the annular structure passes through the hole of the forging; S2b, installing a plurality of the anti-slip hooks mounted with forgings on a dense hanger, wherein the anti-slip hooks are closely arranged on the dense hanger; S2c, moving the dense hanger so that the forging mounted thereon is sequentially subjected to etching, solution treatment, aging and acid-base polishing treatment.

[0010] Preferably, step S2 also includes the following steps: S2d, removing the anti-drop hook from the dense hanger and installing it on the sparse hanger, and the anti-drop hook is sparsely arranged on the sparse hanger; S2e, moving the sparse hanger so that the forgings mounted thereon are shot blasted.

[0011] Preferably, step S1 includes the following steps: S1a, forming two positioning surfaces parallel to each other on the blank, and respectively forming a truncated cone-shaped recess and a prism-shaped recess on the two positioning surfaces, wherein the truncated cone-shaped recess and the prism-shaped recess are located on the same axis; S1b, positioning the blank through the truncated cone-shaped recess and the prism-shaped recess, and allowing the blank to only rotate around the axis; S1c, transmitting torque through the prism-shaped recess and rotating the blank; S1d, performing medium-frequency induction heating on the rotating blank; S1e, die forging the heated blank, cutting off the flash after forming, and punching out holes to obtain a forging.

[0012] A post-processing system for a tension spring swing arm forging, comprising: a dense rack, which is detachably connected to an etching device, a solution treatment device, an aging device and an acid-base polishing device, and replaces the racks of the etching device, the solution treatment device, the aging device and the acid-base polishing device; an anti-detachment hook, which has an openable and closable annular structure, the annular structure can pass through a hole formed on the forging, and the anti-detachment hook is detachably connected to the dense rack.

[0013] Preferably, it also includes a sparse hanger, which replaces the hanger of the shot blasting equipment, and the anti-detachment hook is detachably connected to the sparse hanger.

[0014] Preferably, the anti-drop hook comprises a hook, an anti-drop rod, a shaft and an elastic member, the middle end of the hook is hinged to the middle end of the anti-drop rod through the shaft, the elastic member connects one end of the hook and one end of the anti-drop rod adjacent to it, and the rebound force of the elastic member makes the other end of the hook and the other end of the anti-drop rod approach each other and form the annular structure.

[0015] Preferably, the hook includes a hook portion, a first axle seat and a first transmission rod connected in sequence, the anti-drop rod includes a rod portion, a second axle seat and a second transmission rod connected in sequence, the first axle seat and the second axle seat are hinged through the axis, the first transmission rod and the second transmission rod are connected through the elastic member, and the elastic member is in a compressed state.

[0016] Preferably, both ends of the shaft are formed with inwardly recessed insertion holes.

[0017] Preferably, the post-processing system also includes an industrial robot, which includes a servo drive system and an unlocking part for opening the annular structure; the servo drive system has at least three degrees of freedom, and the working range of the servo drive system spans the workstations where the acid-base light-emitting equipment and the shot blasting equipment are located; the unlocking part includes a first clamp and a first driver, the first clamp has two and is installed on the actuator of the first driver, the first driver is installed on the actuator of the servo drive system, and the first driver is used to drive the two first clamps to approach each other to clamp the first transmission rod and the second transmission rod so that the annular structure is opened.

[0018] Preferably, the industrial robot also includes a grasping part for moving the anti-drop hook, the grasping part includes a second clamp and a second driver, the second clamp has two and is installed on the actuator of the second driver, the second driver is installed on the actuator of the servo drive system, and the second clamp is formed with a connector that matches the socket.

[0019] Compared with the prior art, this application has the following beneficial effects:

[0020] The use of a dense hanger to integrally move several forgings mounted thereon can reduce the number of steps of assembling and disassembling the hook, thereby greatly reducing the post-processing time of the forgings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0022] Figure 1 It is a top view of the molding system;

[0023] Figure 2 It is a three-dimensional diagram of the molding system;

[0024] Figure 3 for Figure 2 A local enlarged view of point A;

[0025] Figure 4 for Figure 2 A partial enlarged view of point B;

[0026] Figure 5 for Figure 2 A partial enlarged view of point C;

[0027] Figure 6 It is the front view of the positioning depression mold;

[0028] Figure 7 for Figure 6 Cross-sectional view in DD direction;

[0029] Figure 8 is a front view of a partial structure of the second heating device;

[0030] Fig. 9 for Figure 8 Cross-sectional view in the EE direction;

[0031] Fig.10 is a perspective view of a transmission device;

[0032] Fig.11 It is a schematic diagram of the structure of the forging upper die;

[0033] Fig.12 It is a structural schematic diagram of the forging lower die;

[0034] Fig.13 It is a structural schematic diagram of the trimming upper die;

[0035] Fig.14 It is a structural schematic diagram of the trimming lower die;

[0036] Fig.15 A three-dimensional image of the dense racks for the after-treatment system;

[0037] Fig.16 A three-dimensional diagram of the drop-out rack of the post-processing system;

[0038] Fig.17 A three-dimensional schematic diagram of the working state of the anti-drop hook of the post-processing system;

[0039] Fig.18 A three-dimensional diagram of the anti-drop hook of the post-processing system;

[0040] Fig.19 This is a three-dimensional exploded view of the anti-drop hook of the post-processing system;

[0041] Fig. 20 A three-dimensional diagram of the unlocking manipulator, grabbing manipulator and robot of the post-processing system;

[0042] Fig.21 It is a three-dimensional schematic diagram of the working status of the anti-drop hook, unlocking manipulator and grabbing manipulator of the post-processing system;

[0043] Fig. 22 for Fig.21 A local enlarged view of point A;

[0044] The numbers in the figure represent the following:

[0045] 1-transmission device; 1a-first industrial robot; 1a1-first cylinder slide; 1a2-second cylinder slide; 1a3-third cylinder slide; 1b-first manipulator; 1b1-first finger cylinder; 1b2-bar clamp; 1c-second industrial robot; 1d-second manipulator; 1d1-second finger cylinder; 1d2-sheet clamp;

[0046] 2-first heating device; 2a-first heating coil; 2b-second heating coil;

[0047] 3-positioning concave mold; 3a-positioning concave lower mold; 3a1-first protrusion; 3b-positioning concave upper mold; 3b1-second protrusion;

[0048] 4-second heating device; 4a-first positioning member; 4a1-third protrusion; 4b-second driver; 4c-second positioning member; 4c1-fourth protrusion; 4c2-annular flange; 4d-movable bracket; 4d1-bearing seat; 4d2-first bearing; 4d3-second bearing; 4e-third driver; 4f-third heating coil;

[0049] 5-forging die; 5a-forging upper die; 5a1-pre-forging upper cavity; 5a2-final forging upper cavity; 5a3-flash groove; 5a4-overflow hole; 5a5-release die; 5b-forging lower die; 5b1-pre-forging lower cavity; 5b2-final forging lower cavity;

[0050] 6- trimming die; 6a- trimming upper die; 6a1- first die cutting edge; 6a2- die punch; 6b- trimming lower die; 6b1- second die cutting edge; 6b2- blanking cavity;

[0051] 7-anti-drop hook; 7a-drop hook; 7a1-hook portion; 7a2-first shaft seat; 7a3-first transmission rod; 7b-anti-drop rod; 7b1-rod portion; 7b2-second shaft seat; 7b3-second transmission rod; 7c-shaft; 7c1-socket; 7d-elastic member;

[0052] 8-industrial robot; 8a-servo drive system; 8b-unlocking part; 8b1-first clamping jaw; 8b2-first drive; 8c-grasping part; 8c1-second clamping jaw; 8c2-connector; 8c3-second drive. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] First, select suitable materials to produce tension spring swing arm forgings, select 7022 aluminum alloy extrusion bar with a diameter of 45mm as the raw material, cut it into a billet with a length of 120mm along the extrusion direction, and obtain a billet with a specific specification of φ45mm×120mm. The elements and mass percentages of 7022 aluminum alloy extrusion bar are shown in Table 1:

[0055] Table 1 Chemical composition of 7022 aluminum alloy (mass fraction, %)

[0056]

[0057] It complies with the national standard for the composition of 702 aluminum alloy; at the same time, the grain size requirement for 702 aluminum alloy billet is less than or equal to the first-level grain size and the appearance is free of oil stains, aluminum chips, cracks, scratches, bubbles, corrosion, etc., and meets the appearance inspection standards without burrs and sharp corners.

[0058] Then, cut the aluminum alloy bars of specified length as blanks and pre-treat them. In actual cutting, a certain amount of surplus material needs to be reserved to prevent the loss of blanks during processing. Generally speaking, the surplus material shall not be less than 5% of the whole material. When isothermal forging is performed, the blank flows in the mold cavity and fills the cavity, thereby forming the desired shape. At the same time, the quality of the product is improved by die forging, and the excess blank is discharged to form flash. After subsequent processing, the corresponding product can be obtained.

[0059] Finally, the pretreated raw material is heated to 440-450° C. and then blanked to obtain a blank, which is a special-shaped blank close to the tension spring swing arm forging.

[0060] like Figure 1-10 As shown:

[0061] A forming system for a tension spring swing arm forging comprises a forming device for forging a heated blank and a preheating device for heating the blank, wherein the preheating device comprises a first punching machine, a positioning recessed die 3 and a second heating device 4, wherein the positioning recessed die 3 is installed on the execution part of the first punching machine, and the positioning recessed die 3 is used to punch out two positioning surfaces parallel to each other on the blank, and coaxial truncated cone-shaped recesses and prism-shaped recesses are respectively formed on the two positioning surfaces, and the second heating device 4 is used to drive the blank to rotate and heat it so that its temperature reaches 460-470°C.

[0062] like Figure 5 , 8As shown in Figure 9, the second heating device 4 includes a first positioning member 4a, the bottom surface of the first positioning member 4a is a horizontal surface and a third protrusion 4a1 is formed on the surface, which matches with the prism-shaped depression on one positioning surface of the blank; a second positioning member 4c, the top surface of the second positioning member 4c is a horizontal surface and a fourth protrusion 4c1 is formed on the surface, which matches with the truncated cone-shaped depression on another positioning surface of the blank; a movable bracket 4d, the second positioning member 4c is rotatably mounted on the movable bracket 4d, and the rotation axis of the second positioning member 4c is coaxial with the axis of the blank; specifically, The movable bracket 4d includes a bearing seat 4d1 and a first bearing 4d2 and a second bearing 4d3 installed inside the bearing seat 4d1, the first bearing 4d2 and the second bearing 4d3 are coaxial, the second positioning member 4c is cylindrical and inserted inside the first bearing 4d2 and the second bearing 4d3, and the second positioning member 4c is provided with an annular flange 4c2 sandwiched between the inner rings of the first bearing 4d2 and the second bearing 4d3; the third driver 4e, the third driver 4e is a cylinder slide, the movable bracket 4d is installed on the actuator of the third driver 4e, the third driver 4e The device 4e is used to drive the movable bracket 4d to approach or move away from the first positioning member 4a, so that the blank can move axially and its two ends are clamped by the first positioning member 4a and the second positioning member 4c respectively. The third driver 4e not only drives the second positioning member 4c to move, but also always applies a constant downward force to the second positioning member 4c, so that the first positioning member 4a and the second positioning member 4c can firmly clamp the blank; the third heating coil 4f, the third heating coil 4f is coaxially arranged with the second positioning member 4c, the third heating coil 4f can be sleeved on the outside of the blank, the third heating coil 4f heats the blank by medium frequency induction, the position of the third heating coil 4f can be adjusted so that it is sleeved on the outside of the blank, or the blank is driven by the third driver 4e to be inserted into the inside of the third heating coil 4f; the second driver 4b, the second driver 4b is a motor, the first positioning member 4a is installed on the actuator of the second driver 4b, the second driver 4b is used to drive the first positioning member 4a to rotate around its own axis, and the first positioning member 4a is used to transmit torque, so that the blank is heated by the third heating coil 4f during rotation.

[0063] The shaped blank rotates around the axis of the first positioning member 4a and the second positioning member 4c. The shaped blank is difficult to separate from the first positioning member 4a and the second positioning member 4c during the rotation at a relatively high speed, so that the shaped blank can be evenly heated by medium frequency induction. The surface temperature of the blank should be above 400°, and the temperature should be maintained unchanged after the heating reaches the specified temperature for more than 30 minutes.

[0064] When heated, oxide scale will form on the surface of the blank, so it is necessary to remove the oxide scale on the surface by upsetting after heating. After the above treatment, the quality of the blank may be greatly reduced, so it is necessary to weigh its quality twice in succession to make the quality of the blank after heating greater than 5% of the design quality.

[0065] Before heating, the mass of the blank is 110% to 115% of the design mass, and the blank is weighed after medium frequency heating and impurity removal. When the mass of the blank is less than 110% of the design mass, a groove is cut on the surface of the blank, and a blank that has undergone the same medium frequency heating and impurity removal is inserted into the groove to fill the mass defect.

[0066] In this embodiment, when the quality of the blank is reduced after impurities are removed, a groove is cut around the circumference of the blank, and the blank that has been processed in the same way is inserted into the groove, and the added blank is forged to form a whole before die forging.

[0067] This method can control the quality of the blank more accurately and flexibly, that is, the blank will not be too large, resulting in too large flash, nor will the blank be too small to cause defects in the workpiece.

[0068] In the present invention, by adding blanks by grooving and forging to make up for the deficiency, the quality of the product can be improved by releasing part of the stress of the blank by grooving without affecting the quality of the product.

[0069] In the prior art, the blank is directly die-forged, so that residual stress exists in the die-forged blank, which may affect the quality of the subsequent product. In particular, in the comb hanger of the present invention, the structure is relatively fine and complex. When residual stress exists, it often affects the final product quality. Therefore, in this embodiment, it is necessary to release the stress by cutting grooves.

[0070] It should be emphasized that grooving and filling of blanks are not only required when the quality of the raw material is insufficient, but also when the quality of the raw material is sufficient, grooving is also required, but at this time, filling of blanks is not required.

[0071] In the subsequent forging process, the two positioning surfaces on the blank and the truncated cone-shaped depression and the prism-shaped depression are forged into a shape that matches the forming die.

[0072] Further:

[0073] The second heating device 4 also includes a fourth driver (not shown) for driving the third heating coil 4f to move along the output axis direction of the second driver 4b. The fourth driver enables the third heating coil 4f to be sleeved on the outside of the blank or away from the blank.

[0074] Based on the above embodiments, the technical problem that the present application aims to solve is how to facilitate the blank to enter or leave the third heating coil 4f. The fourth drive can be an electric push rod, a servo screw slide, or a roller chain transmission device. Its specific structure is already commonplace in this field and will not be described here.

[0075] Further:

[0076] The second heating device 4 further includes a fifth driver (not shown) for driving the third driver 4e to move along the output axis direction of the second driver 4b. The fifth driver is a stepping linear driver.

[0077] In order to enable the second heating device 4 to heat blanks of different heights, the fifth driver is used to adjust the distance between the second positioning member 4c and the first positioning member 4a, and the structure of the fifth driver is the same as that of the fourth driver.

[0078] Further:

[0079] The positioning recessed mold 3 includes a positioning recessed lower mold 3a and a positioning recessed upper mold 3b, which are respectively installed on the execution part and the workbench of the first punching machine. The top surface of the positioning recessed lower mold 3a is a horizontal plane, and the top surface of the positioning recessed lower mold 3a is formed with a first protrusion 3a1, and the first protrusion 3a1 is a prism shape. The bottom surface of the positioning recessed upper mold 3b is a horizontal plane, and the bottom surface of the positioning recessed upper mold 3b is formed with a second protrusion 3b1 coaxial with the first protrusion 3a1, and the second protrusion 3b1 is a truncated cone shape.

[0080] The positioning recessed lower die 3a is used to punch out the first positioning surface, the positioning recessed upper die 3b is used to punch out the second positioning surface, the first protrusion 3a1 is used to punch out the prism-shaped recess on the blank, and the second protrusion 3b1 is used to punch out the truncated cone-shaped recess on the blank.

[0081] Furthermore, in order to make it easier for the positioning recess mold 3 to punch out the positioning surface and its corresponding recess on the blank:

[0082] It also includes a first heating device 2 for heating both ends of the blank. On the production line, the first heating device 2 is located at the upstream station of the first stamping machine. The first heating device 2 includes a first heating coil 2a that can be mounted on one end of the blank in the length direction, and a second heating coil 2b that can be mounted on the other end of the blank in the length direction, and a first driver that drives the first heating coil 2a and the second heating coil 2b to move closer to or away from each other.

[0083] The first driver and the fourth driver have the same structure and working principle. The first driver is used to drive the first heating coil 2a and the second heating coil 2b away from each other before heating to facilitate the placement of the blank therein, and thereafter drive the first heating coil 2a and the second heating coil 2b toward each other, so that the two ends of the blank in the length direction are enveloped by the first heating coil 2a and the second heating coil 2b.

[0084] Further, such as Figure 11-14 As shown:

[0085] The forming device includes a forging die 5 and a forging machine (not shown in the figure). The die forging adopts a 2500-ton die forging machine. During the forging process, a water-based release agent is used for lubrication, and the ratio of the release agent is 1:8.

[0086] The forging die 5 includes a forging upper die 5a and a forging lower die 5b, which are respectively installed on the execution part and the workbench of the forging machine. The forging upper die 5a and the forging lower die 5b are driven by the forging machine to approach each other to forge the blank. A pre-forging upper cavity 5a1 and a final forging upper cavity 5a2 are respectively arranged in the forging upper die 5a, and a pre-forging lower cavity 5b1 and a final forging lower cavity 5b2 are respectively arranged at the position of the forging lower die 5b corresponding to the forging upper die 5a. The pre-forging upper cavity 5a1 and the pre-forging lower cavity 5b1 form a pre-forging cavity after closing, and the final forging upper cavity 5a2 and the final forging lower cavity 5b2 form a final forging cavity after closing.

[0087] The specific steps of pre-forging are as follows: the lower line of the die forging machine is 150mm, the pre-forging temperature of the billet is 460-470℃, the striking energy is 200r / min, and the temperature of the billet after die forging is ≥470℃;

[0088] The specific steps of final forging are as follows: the lower line of the die forging machine is 200mm, the final forging temperature of the billet is 440-490℃, the striking energy is 350r / min, and the temperature of the billet after die forging is ≥350℃;

[0089] During pre-forging and final forging, the temperature of the pre-forging die and the final forging die is maintained at 160-180°C by a heating device arranged on the forming die.

[0090] In this embodiment, the pre-forging and final forging are placed in the same die forging machine for forging, that is, the pre-forging is carried out at the same time as the final forging, which greatly shortens the process time and reduces the labor intensity. Moreover, according to the above, different pre-forging dies and final forging dies can be replaced according to actual needs to adapt to different needs.

[0091] In addition, in the present invention, since the downward processes of pre-forging and final forging are different, the die forging machines for pre-forging and final forging can be in different planes, and the height difference between the two planes is locked, and the downward processes of pre-forging and final forging can be mutually constrained to achieve forging of the billet.

[0092] The specific steps of forging are:

[0093] Step S1, first feed the first blank into the pre-forging die for pre-forging; Step S2, feed the first blank after the first die forging process into the final forging die for final forging, and at the same time feed the second blank into the pre-forging die for pre-forging; repeat steps S1 to S2 to complete the die forging process of multiple blanks in sequence.

[0094] According to the above method, the forging upper die 5a and the forging lower die 5b are driven by the press to approach each other to perform die forging on the blank. During the die forging process, a water-based release agent is used to lubricate the blank and the forming die. The specific steps of lubrication are:

[0095] The water-based mold release agent is evenly sprayed on the inner surface of the forming die, and a specified volume of the water-based mold release agent is stored in the forming die. During the die forging process, the water-based mold release agent continuously flows into the forming die to achieve continuous lubrication.

[0096] A reflux groove is arranged at the top edge of the forming die, and a plurality of notches connected to the die forging station are arranged on the reflux groove, and the reflux groove is connected to a liquid storage tank arranged in the cavity of the forming die through a drainage groove. The water-based mold release agent stored in the liquid storage tank is distributed on the edge of the die forging station through the reflux groove, and the water-based mold release agent is continuously input into the die forging station through the notch to lubricate the blank.

[0097] In the foregoing, the liquid reservoir is filled with a sufficient amount of release agent, and during the entire die forging process, the release agent can be continuously and continuously filled into the forming die, so that the release agent is neither excessive nor missing.

[0098] Further:

[0099] The outer edges of the pre-forging upper cavity 5a1 and the final forging upper cavity 5a2 are both provided with flash grooves, and the outer edges of the pre-forging lower cavity 5b1 and the final forging lower cavity 5b2 are provided with flash grooves of the same structure, and a plurality of unevenly arranged overflow holes are provided between the flash grooves and the pre-forging cavity and the final forging cavity.

[0100] Based on the above embodiments, the present application needs to take surplus materials into consideration when calculating raw materials. The flash grooves located at the edges of the upper cavity (pre-forging upper cavity 5a1 and final forging upper cavity 5a2) and the lower cavity (pre-forging lower cavity 5b1 and final forging lower cavity 5b2) form groove channels that can accommodate surplus materials. At the same time, the overflow holes 5a4 facilitate the outflow of surplus materials without affecting the actual die forging effect.

[0101] Further:

[0102] A release die 5a5 is formed on both the forging upper die 5a and the forging lower die 5b. The release die 5a5 is located between the pre-forging cavity and the final forging cavity. When the forging die 5 is closed, the release die 5a5 forms a release cavity.

[0103] Based on the above embodiments, in order to avoid mutual influence between pre-forging and final forging at the same workstation, a release cavity is provided between the pre-forging cavity and the final forging cavity. When a large amount of overflowing blanks is present, they will flow out of the forming mold through the release cavity and will not interfere with or affect the processing on the other side.

[0104] The forming device also includes a trimming die 6 and a second punch (not shown in the figure). The trimming die 6 is located at the downstream station of the forging die 5 on the production line. The trimming die 6 includes an upper trimming die 6a and a lower trimming die 6b. The upper trimming die 6a and the lower trimming die 6b are driven by the second punch to approach each other to cut off the flash of the blank. The upper trimming die 6a and the lower trimming die 6b are both provided with die cutting edges corresponding to the positions of the blank flash. The die cutting edges include a first die cutting edge 6a1 and a second die cutting edge 6b1. A plurality of die punches 6a2 for punching holes are provided in the upper trimming die 6a.

[0105] The forging die 5 and the trimming die 6 do not interfere with each other during operation. They process the blank according to the processing sequence of the production line. After the blank is forged, since there are burrs on its edges, the burrs need to be trimmed in the next process, and corresponding holes also need to be punched on the forging.

[0106] The specific steps of cutting and punching are:

[0107] The forging is placed on the cavity of the trimming lower die 6b, and the trimming upper die 6a moves downward under the drive of the press, so that the cavity of the trimming upper die 6a contacts the forging with flash, and the excess flash of the forging is cut off under the shearing action of the first die edge 6a1 and the second die edge 6b1; the trimming upper die 6a continues to move downward under the drive of the second punching machine, and the punching head fixed on the trimming upper die 6a or the trimming lower die 6b punches the forging, and after completing the trimming and punching of the forging, the forging is ejected out of the cavity of the trimming lower die 6b under the action of the ejector rod.

[0108] The forgings that have completed the trimming and punching process are cooled with water at 60 to 70°C, and then the excess flash is ground off to complete the forging of the tension spring swing arm.

[0109] Furthermore, a blanking cavity 6b2 is provided in the trimming lower die 6b, and the blanking cavity 6b2 serves the purpose of supporting and accommodating the blank.

[0110] Further:

[0111] It also includes a transmission device 1 for driving the blank to pass through the first heating device 2, the positioning recessed mold 3, the second heating device 4, the forging mold 5 and the trimming mold 6 in sequence. The transmission device 1 includes a first industrial robot 1a, whose working range includes the workstations where the first heating device 2, the positioning recessed mold 3, the second heating device 4 and the forging mold 5 are located; a first manipulator 1b, which is installed on the executive part of the first industrial robot 1a, and the first manipulator 1b is used to clamp the blank; a second industrial robot 1c, whose working range includes the workstations where the forging mold 5 and the trimming mold 6 are located; a second manipulator 1d, which is installed on the executive part of the second industrial robot 1c, and the second manipulator 1d is used to clamp the forging.

[0112] Based on the above embodiments, the technical problem that the present application aims to solve is how to transfer the blank and its shape after initial forging, final forging, trimming and punching.

[0113] To this end, the present application uses two sets of industrial robots and two sets of manipulators to respectively transfer the blank and its forged shape.

[0114] Among them, the first industrial robot 1a includes a first cylinder slide 1a1, a second cylinder slide 1a2 and multiple third cylinder slides 1a3, the first cylinder slide 1a1 is horizontally arranged, the second cylinder slide 1a2 is vertically arranged, the third cylinder slide 1a3 is horizontally arranged and perpendicular to the first cylinder slide 1a1, the first manipulator 1b includes a first finger cylinder 1b1 and a bar clamp 1b2, the number of the first finger cylinder 1b1 and the third cylinder slide 1a3 is the same and corresponds one to one, the first industrial robot 1a and the first manipulator 1b can move in the XYZ axis and synchronously transmit multiple rod-shaped blanks.

[0115] Among them, the second industrial robot 1c is a five-axis industrial robot, the second manipulator 1d includes a second finger cylinder 1d1 and a sheet clamp 1d2, and the second industrial robot 1c and the second manipulator 1d can be linked by five axes and transmit plate-shaped forgings.

[0116] like Figure 15-22 As shown, this application also provides:

[0117] A method for forming a tension spring swing arm forging comprises the following steps:

[0118] S1, forging the blank into a forging;

[0119] S1a, forming two positioning surfaces parallel to each other on a blank of any shape, and forming a truncated cone-shaped depression and a prism-shaped depression on the two positioning surfaces respectively, wherein the truncated cone-shaped depression and the prism-shaped depression are located on the same axis;

[0120] S1b, positioning the blank by means of the truncated cone-shaped recess and the prism-shaped recess, and allowing the blank to rotate only around the axis;

[0121] S1c, transmitting torque through the pyramidal depression and rotating the blank;

[0122] S1d, medium frequency induction heating of the rotating blank;

[0123] S1e, die forging the heated blank, cutting off the flash after forming it, and punching out the hole to obtain a forging.

[0124] S2, post-processing of forgings:

[0125] S2a, the forging is mounted on the anti-drop hook 7 through the hole formed in the forging, the anti-drop hook 7 has an openable and closable annular structure, and the annular structure passes through the hole of the forging;

[0126] S2b, installing a plurality of anti-drop hooks 7 with forgings mounted thereon onto a dense rack, wherein the anti-drop hooks 7 are closely arranged on the dense rack;

[0127] S2c, moving the dense racks to make the forgings mounted thereon undergo etching, solution treatment, aging and acid-base polishing treatment in sequence;

[0128] S2d, remove the anti-drop hook 7 from the dense hanger and install it on the sparse hanger, where the anti-drop hook 7 is sparsely arranged; S2e, move the sparse hanger so that the forging mounted on it is shot blasted.

[0129] Etching treatment:

[0130] The etching solution and time are 15-30% nitric acid solution for 10 minutes, and then 20% NaOH solution for 10 minutes. The forgings after etching are inspected for size, and forgings without forging defects and forming defects are selected to obtain qualified forgings; Solution treatment:

[0131] After etching, the forgings without forging defects and forming defects are solution treated to obtain forgings after solution treatment. The temperature of the solution treatment is 420°C.

[0132] After the furnace temperature reaches 420℃, the forgings are placed in the heat treatment furnace for heat preservation. After the solution treatment is completed, the forgings are quickly transferred to warm water for cooling for 20 minutes. The transfer time is ≤15s. Aging treatment:

[0133] After solution treatment, the forgings are subjected to aging treatment. After the furnace temperature reaches the set temperature, the forgings are placed in a heat treatment furnace for insulation; acid and alkali polishing treatment:

[0134] The qualified forgings after heat treatment are pickled, placed in a solution with a mass ratio of opalizer: sulfuric acid: water of 5:2:93 at room temperature for 5 to 10 minutes for degreasing, then washed with clean water, and polished with a grinding wheel machine; then water-polished with abrasive liquid as a brightener for 8 to 10 minutes, alkaline-etched with a 20% NaOH solution at 40 to 50°C for 15 to 20 minutes, then washed with water, and then polished with a 30% HNO3 solution at room temperature for 1 to 2 minutes, and finally sealed with 95°C hot water.

[0135] Shot blasting:

[0136] The qualified forgings after heat treatment are placed in a shot blasting machine for shot blasting for 15 minutes to obtain forgings with certain surface work hardening and residual stress.

[0137] In the existing process, forgings need to be repeatedly removed and installed on the hooks of the corresponding equipment when they undergo etching, solution treatment, aging treatment and acid-base polishing treatment, which leads to low work efficiency. Therefore, the dense hanger and the forgings mounted on it are moved as a whole, which can reduce the three steps of installing and removing the hooks, thereby greatly reducing the post-processing time of the forgings.

[0138] During shot blasting, if the distance between forgings is too close, some surfaces of the forgings will be difficult to be shot blasted, and the forgings may even shake and collide with each other during shot blasting. Therefore, it is necessary to replace the dense hanger with the anti-drop hook 7 with a sparse hanger.

[0139] This application also provides:

[0140] A post-processing system for a tension spring swing arm forging comprises a dense hanger, which is detachably connected to an etching device, a solution treatment device, an aging device and an acid-base polishing device, and replaces the hanger of the etching device, the solution treatment device, the aging device and the acid-base polishing device; and an anti-detachment hook 7, which has an openable and closable annular structure, the annular structure can pass through a hole formed on the forging, and the anti-detachment hook 7 is detachably connected to the dense hanger.

[0141] Further:

[0142] The post-processing system further comprises a sparse hanging rack, which replaces the hanging rack of the shot blasting equipment, and the anti-drop hook 7 is detachably connected to the sparse hanging rack.

[0143] Further:

[0144] The anti-drop hook 7 includes a hook 7a, an anti-drop rod 7b, a shaft 7c and an elastic member 7d. The middle end of the hook 7a is hinged to the middle end of the anti-drop rod 7b through the shaft 7c. The elastic member 7d is installed on one end of the hook 7a and one end of the anti-drop rod 7b adjacent thereto. The rebound force of the elastic member 7d makes the other end of the hook 7a and the other end of the anti-drop rod 7b approach each other and form a ring structure.

[0145] The hook 7a is used to pass through the hole on the forging. Under the rebound force of the elastic member 7d, the anti-drop rod 7b and the hook 7a rotate relative to each other, so that one end of the anti-drop rod 7b closes the opening of the hook end of the hook 7a, thereby forming a closed annular structure, so that the anti-drop hook 7 has an anti-drop function.

[0146] Both the dense hanging rack and the sparse hanging rack are provided with a mounting portion capable of supporting the shaft 7c.

[0147] The mounting part is a pair of arc strip-shaped parts with openings facing upwards, and the two ends of the shaft 7c respectively abut against the inner circumferential surface of the mounting part from top to bottom, so that the dense hanging rack or the sparse hanging rack can support and position the anti-drop hook 7.

[0148] Further:

[0149] The hook 7a includes a hook portion 7a1, a first axle seat 7a2 and a first transmission rod 7a3 connected in sequence, the anti-drop rod 7b includes a rod portion 7b1, a second axle seat 7b2 and a second transmission rod 7b3 connected in sequence, the first axle seat 7a2 and the second axle seat 7b2 are hinged by an axis 7c, the first transmission rod 7a3 and the second transmission rod 7b3 are connected by an elastic member 7d, and the elastic member 7d is in a compressed state.

[0150] The hook 7a and the anti-drop rod 7b form a structure similar to pliers, the elastic member 7d is a spring, and cylindrical protrusions for mounting the elastic member 7d are provided on the first transmission rod 7a3 and the second transmission rod 7b3.

[0151] The staff can drive the hook 7a1 and the rod 7b1 to move relatively apart by clamping the first transmission rod 7a3 and the second transmission rod 7b3. In the absence of external force, the elastic member 7d arranged between the first transmission rod 7a3 and the second transmission rod 7b3 drives the hook 7a1 and the rod 7b1 to move relatively close by its own rebound force.

[0152] Further:

[0153] Both ends of the shaft 7c are formed with inwardly recessed insertion holes 7c1.

[0154] The purpose of the insertion hole 7c1 is to facilitate the staff to use calipers to insert into the insertion hole 7c1 to clamp the shaft 7c, so that the staff can use the calipers to stably move the anti-drop hook 7.

[0155] Further:

[0156] The post-processing system also includes an industrial robot 8, which includes a servo drive system 8a and an unlocking part 8b for opening the annular structure; the servo drive system 8a has at least three degrees of freedom, and the working range of the servo drive system 8a spans the workstations where the acid-base light-emitting equipment and the shot blasting equipment are located; the unlocking part 8b includes a first clamp 8b1 and a first driver 8b2, the first driver 8b2 is a finger cylinder, the first clamp 8b1 has two actuators installed on the first driver 8b2, the first driver 8b2 is installed on the actuator of the servo drive system 8a, and the first driver 8b2 is used to drive the two first clamps 8b1 to approach each other to clamp the first transmission rod 7a3 and the second transmission rod 7b3 so that the annular structure is opened.

[0157] Further:

[0158] Since the hook portion 7a1 makes a circular motion rotating around the first shaft seat 7a2, when the hook portion 7a1 and the rod portion 7b1 are separated, the forging mounted on the hook portion 7a1 is likely to fall directly from the hook portion 7a1. In order to avoid this problem that may cause difficulties in loading, the actuator of the hook portion 7a1 extends along an arc-shaped line protruding downward, which enables the forging to still be mounted on a lower part of the hook portion 7a1 when the hook portion 7a1 makes a circular motion.

[0159] Further:

[0160] The industrial robot 8 also includes a grasping part 8c for moving the anti-drop hook 7, the grasping part 8c includes a second clamping jaw 8c1 and a second driver 8c3, the second driver 8c3 is a finger cylinder, the second clamping jaw 8c1 has two actuators installed on the second driver 8c3, the second driver 8c3 is installed on the actuator of the servo drive system 8a, and a connector 8c2 that matches the socket 7c1 is formed on the second clamping jaw 8c1.

[0161] The gripping portion 8c is used to replace the calipers held by the staff to achieve automation.

[0162] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A post-processing system for a tension spring swing arm forging, characterized in that: include, A dense rack, which is detachably connected to the etching equipment, the solid solution equipment, the aging equipment and the acid-base polishing equipment, and replaces the racks of the etching equipment, the solid solution equipment, the aging equipment and the acid-base polishing equipment; A sparse hanging rack, wherein the sparse hanging rack replaces the hanging rack of the shot blasting equipment; An anti-drop hook (7) having an openable and closable annular structure, the annular structure being capable of passing through a hole formed on a forging, the anti-drop hook (7) being detachably connected to the dense hanger and the sparse hanger; An industrial robot (8), the industrial robot (8) comprising a servo drive system (8a), an unlocking portion (8b) for opening the annular structure, and a grasping portion (8c) for moving the anti-drop hook (7); The servo drive system (8a) has at least three degrees of freedom, and the working range of the servo drive system (8a) spans the workstations where the acid-base polishing equipment and the shot blasting equipment are located; The unlocking part (8b) comprises a first clamping jaw (8b1) and a first driver (8b2), the first clamping jaw (8b1) having two actuators mounted on the first driver (8b2), the first driver (8b2) being mounted on the actuator of the servo drive system (8a), and the first driver (8b2) being used to drive the two first clamping jaws (8b1) to move closer to each other to open the annular structure; The gripping portion (8c) comprises a second clamping jaw (8c1) and a second driver (8c3), the second clamping jaw (8c1) having two actuators mounted on the second driver (8c3), and the second driver (8c3) being mounted on the actuator of the servo drive system (8a); The anti-drop hook (7) comprises a hook (7a), an anti-drop rod (7b), a shaft (7c) and an elastic member (7d); the middle end of the hook (7a) is hinged to the middle end of the anti-drop rod (7b) via the shaft (7c); the elastic member (7d) connects one end of the hook (7a) and one end of the anti-drop rod (7b) adjacent thereto; and the rebound force of the elastic member (7d) causes the other end of the hook (7a) and the other end of the anti-drop rod (7b) to approach each other and form the annular structure; both ends of the shaft (7c) are formed with inwardly recessed insertion holes (7c1); and the second clamping claw (8c1) is formed with a plug-in member (8c2) matching the insertion hole (7c1).

2. A post-processing system for a tension spring swing arm forging according to claim 1, characterized in that: The hook (7a) comprises a hook portion (7a1), a first shaft seat (7a2) and a first transmission rod (7a3) which are connected in sequence; the anti-dropping rod (7b) comprises a rod portion (7b1), a second shaft seat (7b2) and a second transmission rod (7b3) which are connected in sequence; the first shaft seat (7a2) and the second shaft seat (7b2) are hinged via the shaft (7c); the first transmission rod (7a3) and the second transmission rod (7b3) are connected via the elastic member (7d); and the elastic member (7d) is in a compressed state.

3. A method for forming a tension spring swing arm forging, characterized in that: The molding method uses the post-processing system described in any one of claims 1-2, and the molding method comprises the following steps: S1, forging the blank into a forging; S2, post-processing of forgings: S2a, mounting the forging on an anti-slip hook (7) through a hole formed in the forging, wherein the anti-slip hook (7) has an openable and closable annular structure, and the annular structure passes through the hole of the forging; S2b, installing a plurality of the anti-drop hooks (7) with forgings mounted thereon onto a dense hanging rack, wherein the anti-drop hooks (7) are closely arranged on the dense hanging rack; S2c, moving the dense rack so that the forgings mounted thereon are sequentially subjected to etching, solution treatment, aging and acid-base polishing treatment.

4. The forming method of a tension spring swing arm forging according to claim 3, characterized in that: Step S2 also includes the following steps: S2d, removing the anti-drop hook (7) from the dense hanging rack and installing it on the sparse hanging rack, the anti-drop hook (7) being sparsely arranged on the sparse hanging rack; S2e, moving the sparse rack so that the forgings mounted thereon are shot blasted.

5. A method for forming a tension spring swing arm forging according to claim 3 or 4, characterized in that: Step S1 includes the following steps: S1a, forming two positioning surfaces parallel to each other on the blank, and forming a truncated cone-shaped depression and a prism-shaped depression on the two positioning surfaces respectively, wherein the truncated cone-shaped depression and the prism-shaped depression are located on the same axis; S1b, positioning the blank by means of the truncated cone-shaped recess and the prism-shaped recess, and allowing the blank to rotate only around the axis; S1c, transmitting torque through the pyramidal depression and rotating the blank; S1d, medium frequency induction heating of the rotating blank; S1e, die forging the heated blank, cutting off the flash after forming it, and punching out the hole to obtain a forging.

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