CN110899411B - Bending forming system and method for bent arm knuckle - Google Patents
Bending forming system and method for bent arm knuckle Download PDFInfo
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- CN110899411B CN110899411B CN201911139731.3A CN201911139731A CN110899411B CN 110899411 B CN110899411 B CN 110899411B CN 201911139731 A CN201911139731 A CN 201911139731A CN 110899411 B CN110899411 B CN 110899411B
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- 238000005452 bending Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000007246 mechanism Effects 0.000 claims abstract description 111
- 238000005242 forging Methods 0.000 claims abstract description 71
- 238000007667 floating Methods 0.000 claims abstract description 30
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 230000003993 interaction Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 description 6
- 210000000245 forearm Anatomy 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/06—Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
- B21D45/02—Ejecting devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
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- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention discloses a bending forming system of a bent arm knuckle, which comprises a first hydraulic mechanism, a second hydraulic mechanism, a bending forming die and a driving control unit, wherein the first hydraulic mechanism is connected with the second hydraulic mechanism; the first hydraulic mechanism comprises a first piston rod (2) and a sliding block (5) sleeved on the first piston rod (2) and capable of moving along the inner wall of the cylinder body, and the second hydraulic mechanism comprises a second cylinder plunger rod (14); the bending forming die comprises a fixed lower die holder (9), and a fixed lower die (11) and a floating lower die (12) which are arranged in the fixed lower die holder (9), and the driving control unit comprises an oil tank (28), a first driving control mechanism and a second driving control mechanism. The invention also discloses a knuckle forging bending forming method. According to the invention, the second hydraulic mechanism is controlled by the driving and control unit to cooperate with the first hydraulic mechanism, so that the bending forming die is pressed, the bending forming of the knuckle forging is completed, the forming precision is high, and the contour is clear.
Description
Technical Field
The invention belongs to the technical field of die forging processes and equipment, and particularly relates to a bending forming system and method for a bent arm knuckle.
Background
The knuckle is a key stressed part of an automobile steering system, and supports the weight of an automobile body and bears steering torque. Because of the severe working environment and high requirement on mechanical properties, forging is generally adopted for forming. The drum type steering knuckle is generally composed of a stepped rod part, an unequal hexagonal thin flange which is symmetrically distributed with the x axis and the y axis, and two fork lugs with drum-shaped side surfaces. The two fork lugs are parallel to each other and are inclined by an angle a with the axis of the rod part, and the forging process comprises three steps of blank making, pre-forging and final forging.
The knuckle with the bent arm is a new commercial vehicle knuckle developed in the last two years. At present, no document for forging and producing the knuckle is found, and the bent arm knuckle is not found in markets at home and abroad. Xia Ju et al in the literature, "development and use of split flash-free die forging, die industry, 2019.45 (5): 52-57' report a knuckle with arm similar to it, its original production process is that the forearm bent by 90 degrees sideways with the pole portion is forged separately into a bar piece with rectangular cross section, after machining, the bar piece is fastened with the knuckle flange plate into a whole by adopting strong bolt, the applicant develops a die-out forward and backward extrusion blank-out, horizontal separable die lateral extrusion preforming and vertical small flash final forging integrated die forging forming process, and the knuckle integrated bent arm knuckle with arm can be produced. The steering knuckle produced by adopting the integrated die forging process has the advantages that the weight of a single bent arm steering knuckle can be reduced by about 5kg, the materials and the energy are saved, and the weight reduction effect is good. However, the bending arm of the knuckle shown in fig. 1 is bent laterally by 90 degrees, but the bending arm and the flange are in cylindrical transitional connection, so that the integrated die forging production cannot be realized by adopting the process.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the invention provides a bending forming system and a bending forming method for a bent arm knuckle, wherein a first hydraulic mechanism presses down a bending forming die, a second hydraulic mechanism is arranged at the bottom of the first hydraulic mechanism, the second hydraulic mechanism is controlled by a driving and control unit to cooperate with the first hydraulic mechanism to press the bending forming die, so that the bending forming of the bent arm knuckle is finished, and the forming precision is high and the contour is clear.
In order to achieve the above object, according to one aspect of the present invention, there is provided a bending forming system for a knuckle of a bending arm, comprising a first hydraulic mechanism, a second hydraulic mechanism, a bending forming die provided between the first hydraulic mechanism and the second hydraulic mechanism, and a drive control unit connected to the first hydraulic mechanism and the second hydraulic mechanism, respectively; wherein,
The first hydraulic mechanism and the second hydraulic mechanism jointly form a cylinder body capable of accommodating the bending forming die, the first hydraulic mechanism comprises a first piston rod and a sliding block which is fixed on the first piston rod and can move along the inner wall of the cylinder body, and the second hydraulic mechanism comprises a second cylinder plunger rod;
The bending forming die comprises an upper die plate fixed below the sliding block, an upper die fixed below the upper die plate, a lower die holder, a fixed lower die and a floating lower die which are arranged in the fixed lower die holder, and a knuckle forging piece is arranged in die bores of the fixed lower die and the floating lower die;
The driving control unit comprises an oil tank, a first driving control mechanism and a second driving control mechanism, one end of the first driving control mechanism and one end of the second driving control mechanism are communicated with the oil tank, the other end of the first driving control mechanism and one end of the second driving control mechanism are respectively communicated with the first hydraulic mechanism and the second hydraulic mechanism through oil pipes, the first driving control mechanism and the second driving control mechanism control the first piston rod to push the upper die to downwards travel to the floating lower die to be closed according to forming parameters of the knuckle forging, the knuckle forging is compressed, and the first piston rod and the floating lower die are acted together through a second oil cylinder plunger rod to realize bending forming of the knuckle forging.
Further, the first hydraulic mechanism comprises a first beam and a side wall, the second hydraulic mechanism comprises a second beam, and the first beam, the side wall and the second beam jointly form a frame body.
Further, the first hydraulic mechanism comprises a first oil cylinder, the first oil cylinder penetrates through the first cross beam and is in sealing connection with the cylinder body, and the first piston rod is arranged in the first oil cylinder.
Further, the bending forming die comprises a backing plate and a press workbench arranged on the backing plate.
Further, the bending forming die comprises an ejector, and the ejector is arranged in a central hole at the bottom of the sliding block and penetrates through the upper die plate to be in contact with the upper die.
Further, the second hydraulic mechanism comprises a second oil cylinder, the second oil cylinder is arranged in the base plate, one end of a plunger rod of the second oil cylinder is arranged in the second oil cylinder, and the other end of the plunger rod of the second oil cylinder penetrates through the press workbench to be in contact with the fixed lower die seat.
Further, the first driving control mechanism comprises a first servo motor, a first oil pump, a reversing valve, a first oil pressure gauge and a first overflow valve, wherein the first oil pump is driven by the first servo motor so as to control the pressure of the first oil cylinder, and meanwhile, oil inlet and outlet control is realized by the reversing valve;
the first oil pressure gauge and the first overflow valve are arranged on the other branch pipeline and are connected with the pipeline of the first driving control mechanism in parallel.
Further, the second drive control mechanism includes a check valve, a second relief valve, a second oil pressure gauge, a second servo motor, and a second oil pump.
According to another aspect of the present invention, there is provided a method of bending a knuckle, comprising the steps of:
S100: operating the first hydraulic mechanism and the second hydraulic mechanism to enable the upper die and the floating lower die to be respectively located at the upper limit position, and fixedly placing the trimmed knuckle forging;
s200: placing the trimmed knuckle forging into a female die consisting of a floating lower female die and a fixed lower female die;
S300: the first hydraulic mechanism and the second hydraulic mechanism are operated to enable the upper die to descend to be closed with the floating lower die and compress the rod part, the flange plate and the rear front arm of the knuckle forging, the front end of the straight wall front arm is only in contact with the inclined surface of the fixed lower die holder, the joint part between the front end and the flange plate is in a suspended state, namely an initial state before bending, along with the continuous descending of the upper die, the front arm end of the straight wall is enabled to be close to the punch on the upper die to generate bending forming when sliding on the inclined surface of the combined fixed lower die by the interaction of the punch on the upper die, the fixed lower die holder and the combined fixed lower die, and the bending forming of the straight wall front arm is completed when the upper die descends to the end point;
S400: and repeating the S operation method, when the upward stroke starts, the upper die, the knuckle forging and the floating lower female die are lifted together until the floating lower female die reaches the upper limit position, and stopping moving, at the moment, the knuckle forging is separated from the combined fixed lower female die, the upper die is lifted to the upper limit position continuously, and if the knuckle forging stays in the die cavity of the upper die, the knuckle forging is lifted out by the ejector.
In general, the above technical solutions conceived by the present invention, compared with the prior art, enable the following beneficial effects to be obtained:
1. according to the forming system disclosed by the invention, the first hydraulic mechanism presses down the bending forming die, the second hydraulic mechanism is arranged at the bottom of the first hydraulic mechanism, the second hydraulic mechanism is controlled to be matched with the first hydraulic mechanism through the driving and control unit, the bending forming die is pressed, and the bending forming of the knuckle forging is completed, so that the forming precision is high, the profile is clear, and the dimensional precision is high.
2. According to the forming system disclosed by the invention, the side surface position of the sliding block is matched with the guide structure arranged on the side wall, so that the sliding block can conveniently move along the fixed direction, an accurate driving force is provided for the bending forming die arranged at the bottom of the sliding block, and the accuracy and the reliability of the servo hydraulic press and the die are further improved.
3. According to the forming system, the ejector is arranged in the cylindrical hole of the sliding block, and the ejector ejects the knuckle forging when the knuckle forging cannot be demoulded from the bending forming die, so that the knuckle forging can be demoulded conveniently.
4. According to the forming system, the bending forming die is arranged between the first hydraulic mechanism and the second hydraulic mechanism, the bending forming die is in direct contact with the knuckle forging, and the knuckle forging is subjected to bending forming through driving force generated by the first hydraulic mechanism and the second hydraulic mechanism.
5. The forming system provided by the invention has the advantages that the driving and controlling unit is connected with the first oil cylinder and the second oil cylinder through the oil pipe, and stable and controllable driving force is provided for the forming system, so that the normal bending forming of the knuckle forging by the servo hydraulic press and the die is ensured.
Drawings
FIG. 1 is a cross-sectional view of the overall structure of a bending forming system for a knuckle of a bending arm in accordance with an embodiment of the present invention;
FIG. 2 is a top view of a knuckle forging without flash removal prior to machining in accordance with an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken at A-A of FIG. 2;
FIG. 4 is a top view of a knuckle forging after machining with flash removed in accordance with an embodiment of the present invention;
fig. 5 is a cross-sectional view at B-B in fig. 4.
Like reference numerals denote like technical features throughout the drawings, in particular: 1-first oil cylinder, 2-first piston rod, 3-first crossbeam, 4-lateral wall, 5-slider, 6-top outlet ware, 7-cope match-plate pattern, 8-cope match-plate pattern, 9-fixed die holder, 10-knuckle forging, 11-fixed die down, 12-floating die down, 13-press workstation, 14-second oil cylinder plunger rod, 15-second oil cylinder, 16-backing plate, 17-second crossbeam, 18-check valve, 19-second overflow valve, 20-second oil gauge, 21-second servo motor, 22-second oil pump, 23-first servo motor, 24-first oil pump, 25-switching valve, 26-first oil gauge, 27-first overflow valve, 28-oil tank.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in FIG. 1, the invention discloses a bending forming system of a bent arm knuckle, which comprises a first hydraulic mechanism, a second hydraulic mechanism, a bending forming die and a driving and controlling unit. The first hydraulic mechanism is a main structure of the servo hydraulic machine and the die, the first hydraulic mechanism presses down the bending forming die, the second hydraulic mechanism is arranged at the bottom of the first hydraulic mechanism, the second hydraulic mechanism and the first hydraulic mechanism are matched to act to press the bending forming die, bending forming of the knuckle forging 10 is completed, and the first hydraulic mechanism and the second hydraulic mechanism are both controlled and driven by a driving and control unit, so that normal and accurate bending forming of the knuckle forging 10 is ensured. The special servo hydraulic machine and the die bend the straight wall front arm of the trimmed knuckle forging 10 into a bent front arm meeting the drawing requirements, ensure wheel clearance and have high dimensional accuracy, and simultaneously provide control and driving force for the servo hydraulic machine and the die by adopting automatic control, so that the accuracy of the knuckle forging 10 is further improved.
As shown in fig. 1 to 5, the first hydraulic mechanism is a main structure of the servo hydraulic machine and the mold, and is driven and controlled by a driving and controlling unit to provide stable and accurate driving force for the folding forming mold. The first hydraulic mechanism comprises a first oil cylinder 1, a first piston rod 2, a first cross beam 3, side walls 4, a sliding block 5, an ejector 6 and a second cross beam 17. The whole hollow cuboid structure that is of this first hydraulic mechanism is equipped with lateral wall 4 in the relative both sides face position of this hollow cuboid structure, is equipped with guide structure at this lateral wall 4 to for slider 5 provides stable direction, ensures knuckle forging 10 can accurate bending formation, and is equipped with cuboid platelike first crossbeam 3 and second crossbeam 17 respectively at its top face and bottom face, simultaneously, is equipped with the circular through-hole that is used for installing first hydro-cylinder 1 in the intermediate position of this first crossbeam 3. Preferably, the first beam 3, the side wall 4 and the second beam 17 are made of thick steel plates, and the whole frame body of the first hydraulic mechanism is made in a welding mode, so that stable and reliable support is provided for other components in the whole frame body, and normal operation of the servo hydraulic machine and the die is ensured. The first oil cylinder 1 is of a hollow cylindrical structure arranged at the position of a circular through hole of the first cross beam 3, an annular boss on the inner side is arranged at the position of a cylindrical opening of the first oil cylinder 1, and meanwhile, an oil pipe is connected at the top and bottom positions of one side surface of the first oil cylinder 1 so that the first oil cylinder 1 is connected with a driving and controlling unit. A cylindrical first piston rod 2 is arranged in the first oil cylinder 1, the outer diameter of the top position of the first piston rod 2 is matched with the inner diameter of the first oil cylinder 1, the outer diameter of the bottom structure of the first piston rod is matched with the inner diameter of the cylinder opening of the first oil cylinder 1, and the first piston rod 2 drives a sliding block 5 arranged at the bottom end of the first piston rod, so that the driving of the bending forming die is completed. The bottom of the first piston rod 2 is fixedly connected with a rectangular plate-shaped sliding block 5, a cylindrical hole for rectangular plate-shaped installation is formed in the middle of the bottom end surface of the cylindrical rectangular plate, the side surface position of the sliding block 5 is matched with a guide structure arranged on the side wall 4, so that the sliding block 5 moves along a fixed direction, an accurate driving force is provided for a bending forming die arranged at the bottom of the sliding block, and the accuracy and reliability of the servo hydraulic press and the die are improved. The ejector 6 is arranged in the cylindrical hole of the sliding block 5, and the ejector 6 ejects the knuckle forging 10 when the knuckle forging 10 cannot be demolded with the bending forming die, so that the knuckle forging 10 can be demolded conveniently.
In addition, the second hydraulic mechanism is arranged at the bottom of the first hydraulic mechanism and matched with the first hydraulic mechanism of the first hydraulic mechanism to provide driving force for the bending forming die. The second hydraulic mechanism comprises a second cylinder plunger rod 14, a second cylinder 15 and a backing plate 16. The backing plate 16 is a rectangular plate provided with the top end of the second beam 17, and a circular through hole is formed in the middle of the backing plate 16, so that the second cylinder 15 is convenient to install, preferably, the backing plate 16 is made of steel, and the backing plate 16 bears the load produced by bending the top member of the backing plate, so that the stability of the whole servo hydraulic press and the whole die is ensured. The circular through hole of the backing plate 16 is provided with a hollow cylindrical second oil cylinder 15, and an oil pipe is connected to the bottom of the second oil cylinder 15 so as to be connected with a driving and controlling unit to provide driving force, meanwhile, the second oil cylinder 15 is internally provided with a cylindrical second oil cylinder plunger rod 14, the outer diameter of the bottom of the second oil cylinder plunger rod 14 is larger than the outer diameters of other parts, the outer diameter of the bottom of the second oil cylinder plunger rod 14 is matched with the outer diameter of the second oil cylinder 15, and the second oil cylinder 15 and the second oil cylinder plunger rod 14 provide upward driving force for a bending forming die so as to finish bending forming of the knuckle forging 10.
The bending mold is provided between the first hydraulic mechanism and the second hydraulic mechanism, and is in direct contact with the knuckle forging 10, and the knuckle forging 10 is subjected to bending molding by the driving force generated by the first hydraulic mechanism and the second hydraulic mechanism. The bending forming die comprises an upper die plate 7, an upper die 8, a fixed lower die holder 9, a fixed lower die 11, a floating lower die 12 and a press workbench 13. The press working table 13 is a rectangular plate fixedly arranged on the backing plate 16, and a circular through hole is arranged in the middle of the rectangular plate, and the size of the circular through hole is consistent with that of the second cylinder plunger rod 14, so that the second cylinder plunger rod 14 can pass through normally. A rectangular groove-shaped fixed lower die holder 9 is fixedly arranged on the top end surface of the press workbench 13, and a rectangular orifice is arranged at one side of the bottom end surface of the rectangular groove-shaped fixed lower die holder so as to facilitate the installation of the floating lower die 12. The other side of the bottom end face of the rectangular groove shape is fixedly provided with a fixed lower die 11, the bottom structure of the fixed lower die 11 is matched with the bottom structure of the fixed lower die holder 9, and the bottom curved surface structure is determined according to the bending forming requirement of the knuckle forging 10. In the process of bending and forming the knuckle forging 10, the fixed lower die 11 is matched with the top component of the knuckle forging 10, and the knuckle forging 10 is bent into a shape meeting the design requirement under the driving action of the driving and controlling unit. The rectangular orifice of the fixed lower die holder 9 is provided with a floating lower die 12, the bottom of which is structurally matched with the fixed lower die holder 9, and the top of which is provided with a die according to the shape of the knuckle forging 10. And the bottom of the floating lower die 12 is fixedly connected with a second oil cylinder plunger rod 14, and the second oil cylinder plunger rod 14 provides lifting driving force for the floating lower die 12, so that the knuckle forging 10 can be bent and formed conveniently. In addition, a rectangular plate-shaped upper template 7 is fixedly arranged at the bottom end surface of the sliding block 5, and a circular through hole which is convenient for the ejector rod of the ejector 6 to pass through is arranged in the middle position of the upper template 7. The upper die 8 with the circular through hole in the middle is fixedly arranged at the bottom end of the upper die plate 7 so as to facilitate the extension of the ejector rod of the ejector 6, ensure the normal taking-out of the knuckle forging 10, and meanwhile, the top of the upper die 8 is of a cuboid structure, and the bottom curved surface structure of the upper die is provided with different design curved surfaces according to different design requirements so as to ensure the bending formation of the pair of knuckle forging 10 and improve the applicability and reliability of the servo hydraulic press and the die.
The driving and controlling unit is connected with the first oil cylinder 1 and the second oil cylinder 15 through oil pipes, and provides stable and controllable driving force for the driving and controlling unit so as to ensure that the servo hydraulic press and the die can normally bend and shape the knuckle forging 10. The driving and controlling unit comprises a first oil cylinder driving and controlling subsystem and a closing die closing driving and controlling subsystem. The first oil cylinder driving and controlling subsystem is connected with two oil pipes reserved on the first oil cylinder 1, and comprises a first servo motor 23, a first oil pump 24, a reversing valve 25, a first oil pressure gauge 26, a first overflow valve 27 and an oil tank 28. The first oil pump 24 is driven by the first servo motor 23 to provide hydraulic pressure, then the hydraulic pressure is transmitted to the first oil cylinder 1 through the reversing valve 25 to provide driving force for the first piston rod 2, and the first oil pressure gauge 26 and the first overflow valve 27 are arranged on the whole oil path to perform recording monitoring and control on the hydraulic pressure, so that the accuracy and the reliability of the servo hydraulic press and the die are improved. The closed-pressure mold clamping driving and controlling subsystem includes a check valve 18, a second relief valve 19, a second oil pressure gauge 20, a second servo motor 21, a second oil pump 22, and an oil tank 28. The subsystem drives the second oil pump 22 by the second servo motor 21 to generate hydraulic pressure to provide driving force for the second oil cylinder 15, and meanwhile, a one-way valve 18, a second overflow valve 19 and a second oil pressure gauge 20 are arranged on the oil path, so that the record and control of the driving force born by the first oil cylinder 1 are achieved, and the normal operation of the servo hydraulic press and the die is ensured.
The invention relates to a bending forming system of a bent arm knuckle, which comprises the following specific implementation steps:
step 1: the hydraulic press is operated so that the upper die 8 and the floating lower die 12 are both in their respective upper limit positions.
Step 2: the trimmed knuckle forging 10 is placed in a cavity consisting of a floating lower die 12 and a fixed lower die 11.
Step 3: the hydraulic press is operated to enable the upper die 8 to descend to be closed with the floating lower die 12 and compress the rod part, the flange plate and the rear forearm of the knuckle forging 10, the front end of the straight wall forearm is only in contact with the curved surface of the fixed lower die seat 9, the joint part between the front end and the flange plate is in a suspended state, namely an initial state before bending, along with the continuous descending of the upper die 8, the front end of the straight wall forearm is enabled to be close to the punch on the upper die 8 to generate bending forming while sliding along the curved surface of the combined fixed lower die 11 through the interaction of the punch on the upper die 8, the fixed lower die seat 9 and the combined fixed lower die 11, and when the upper die 8 descends to the end, the bending forming is finished, and the front arm is bent forming to the drawing requirement
Step 4: the first operation method is repeated, when the upward stroke starts, the upper die 8, the knuckle forging 10 and the floating lower die 12 are lifted together until the floating lower die 12 reaches the upper limit position and stops moving, at the moment, the knuckle forging 10 is separated from the combined fixed lower die, the upper die 8 continues to lift to the upper limit position, and if the knuckle forging 10 stays in the die cavity of the upper die 8, the ejector 6 ejects the knuckle forging 10, so far, one working cycle is ended.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (5)
1. The bending forming system for the bent arm knuckle is characterized by comprising a first hydraulic mechanism, a second hydraulic mechanism, a bending forming die arranged between the first hydraulic mechanism and the second hydraulic mechanism, and a driving control unit respectively connected with the first hydraulic mechanism and the second hydraulic mechanism; wherein,
The first hydraulic mechanism and the second hydraulic mechanism jointly form a cylinder body capable of accommodating the bending forming die, the first hydraulic mechanism comprises a first piston rod (2) and a sliding block (5) which is fixed on the first piston rod (2) and can move along the inner wall of the cylinder body, and the second hydraulic mechanism comprises a second cylinder plunger rod (14);
The bending forming die comprises an upper die plate (7) fixed below the sliding block (5), an upper die (8) fixed below the upper die plate, a fixed lower die holder (9), a fixed lower die (11) and a floating lower die (12) arranged in the fixed lower die holder (9), and a knuckle forging (10) is arranged in the die bores of the fixed lower die (11) and the floating lower die (12);
The driving control unit comprises an oil tank (28), a first driving control mechanism and a second driving control mechanism, one end of the first driving control mechanism and one end of the second driving control mechanism are communicated with the oil tank (28), the other end of the first driving control mechanism and the other end of the second driving control mechanism are respectively communicated with the first hydraulic mechanism and the second hydraulic mechanism through oil pipes, the first driving control mechanism and the second driving control mechanism control the first piston rod (2) to push the upper die (8) to downwards travel until the floating lower die (12) is closed according to forming parameters of the knuckle forging (10), the knuckle forging (10) is compressed, and the first driving control mechanism and the second driving control mechanism act together with the floating lower die (12) through a second oil cylinder plunger rod (14) to realize bending forming of the knuckle forging (10); the first hydraulic mechanism comprises a first cross beam (3) and a side wall (4), the second hydraulic mechanism comprises a second cross beam (17), and the first cross beam (3), the side wall (4) and the second cross beam (17) jointly form a frame body; the first hydraulic mechanism comprises a first oil cylinder (1), the first oil cylinder (1) penetrates through the first cross beam (3) and is connected with the cylinder body in a sealing mode, and the first piston rod (2) is arranged in the first oil cylinder (1); the bending forming die comprises a base plate (16) and a press workbench (13) arranged on the base plate (16); the bending forming die comprises an ejector (6), wherein the ejector (6) is arranged in a central hole at the bottom of the sliding block (5) and penetrates through the upper die plate (7) to be in contact with the upper die (8).
2. A bending formation system for a bent arm knuckle according to claim 1, characterized in that the second hydraulic mechanism comprises a second cylinder (15), the second cylinder (15) being arranged in the backing plate (16), the second cylinder plunger rod (14) being arranged in the second cylinder (15) at one end and in contact with the fixed die holder (9) at the other end through the press table (13).
3. The bending formation system of a bent arm knuckle according to claim 1, characterized in that the first drive control mechanism includes a first servo motor (23), a first oil pump (24), a reversing valve (25), a first oil pressure gauge (26) and a first relief valve (27), wherein the first oil pump (24) is driven by the first servo motor (23) to control the pressure of the first oil cylinder (1) while oil in and out control is achieved by the reversing valve (25);
The first oil pressure gauge (26) and the first overflow valve (27) are arranged on the other branch pipeline and are connected with the pipeline of the first driving control mechanism in parallel.
4. A bending formation system according to any one of claims 1-3, wherein the second drive control mechanism comprises a non-return valve (18), a second relief valve (19), a second oil pressure gauge (20), a second servomotor (21) and a second oil pump (22).
5. The bending forming method of the bent arm knuckle is characterized by comprising the following steps of:
s100: the first hydraulic mechanism and the second hydraulic mechanism are operated to enable the upper die (8) and the floating lower die (12) to be respectively located at the upper limit position, and the trimmed knuckle forging (10) is fixedly placed;
S200: placing the trimmed knuckle forging (10) into a female die consisting of a floating lower female die (12) and a fixed lower female die (11);
S300: the first hydraulic mechanism and the second hydraulic mechanism are operated to enable the upper die (8) to descend to be closed with the floating lower die (12) and compress the rod part, the flange plate and the rear front arm of the knuckle forging piece (10), the front end of the straight wall front arm is only in contact with the inclined surface of the fixed lower die holder (9), the front end is in a suspended state to the flange plate joint part, namely, in an initial state before bending, along with the continuing descending of the upper die (8), the front wall front arm end is enabled to be close to the punch on the upper die (8) while sliding on the inclined surface of the combined fixed lower die (11) through the interaction of the punch on the upper die (8) with the combined fixed lower die holder (9) and the fixed lower die (11), bending forming is generated, and when the upper die (8) descends to a terminal point, the bending forming is finished, and the front arm is bent to a required shape;
s400: repeating the S100 operation method, when the upward stroke starts, the upper die (8), the knuckle forging (10) and the floating lower die (12) are lifted up together until the floating lower die (12) reaches the upper limit position, and then the knuckle forging (10) is separated from the combined fixed lower die, the upper die (8) is lifted up to the upper limit position, and if the knuckle forging (10) stays in the die cavity of the upper die (8), the knuckle forging (10) is lifted out by the ejector (6).
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| CN201911139731.3A CN110899411B (en) | 2019-11-20 | 2019-11-20 | Bending forming system and method for bent arm knuckle |
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| CN201911139731.3A CN110899411B (en) | 2019-11-20 | 2019-11-20 | Bending forming system and method for bent arm knuckle |
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| CN110899411B true CN110899411B (en) | 2024-10-18 |
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| CN111842536A (en) * | 2020-07-01 | 2020-10-30 | 北京航天新立科技有限公司 | Special-shaped pipeline forming process and forming system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN211679442U (en) * | 2019-11-20 | 2020-10-16 | 武汉新威奇科技有限公司 | Bending and forming system for knuckle |
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| CN203140519U (en) * | 2013-01-31 | 2013-08-21 | 武汉铁盾民防工程有限公司 | Hydraulic bending device |
| JP6123810B2 (en) * | 2015-01-08 | 2017-05-10 | マツダ株式会社 | Double-acting system for forging dies |
| CN105729877A (en) * | 2016-04-15 | 2016-07-06 | 天津百利机械装备集团有限公司中央研究院 | Internal high-pressure forming machine with variable mold clamping force and internal high-pressure forming processing method |
| CN107695201B (en) * | 2017-09-27 | 2019-08-06 | 湖北三环锻造有限公司 | With long-armed spindle bending mould |
| CN209189628U (en) * | 2018-11-16 | 2019-08-02 | 滁州市艾帝而机械设备有限公司 | A kind of air-conditioning intermediate transverse girder Bending Mould |
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| CN211679442U (en) * | 2019-11-20 | 2020-10-16 | 武汉新威奇科技有限公司 | Bending and forming system for knuckle |
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