Process for quick positioning and self-locking of a moving table of a die forging hydraulic press

Abstract

The application discloses a kind of mobile workbench quick positioning self-locking process methods of die forging hydraulic press. Including the following steps: step A, making mobile workbench;Step B, making upper backing plate;Step C, making lower backing plate;Step D, making two fixed tracks;Step E, making the same structure front centering pin and rear centering pin;Step F, lower backing plate is installed on the support pedestal of die forging hydraulic press;Step H, blank is placed in mould;Step I, the lower part of roller enters into positioning hole, mobile workbench is attached to lower backing plate and self-locking when the lower pressing mechanism of die forging hydraulic press is pressed down;Step J, after forging is completed, spring resets, lifting block and mobile workbench rise to original height.The centering positioning pin and sliding groove of the application realize automatic centering positioning, utilize hydraulic press pressing force, realize that mobile workbench passes through roller support load to mobile workbench bottom surface transmission pressing load force surface synchronous conversion and realizes self-locking.

Description

Technical Field

[0001] This invention relates to forging, and in particular to a process method for rapid positioning and self-locking of the moving worktable of a die forging hydraulic press. Background Technology

[0002] A die forging hydraulic press is a mechanical device used to press and process various materials. Hydraulic transmission has the characteristics of large force transmission and stable operation, and is widely used in many industrial fields.

[0003] The worktable, as a component that bears the die blank and transmits the pressing force, needs to meet the deformation resistance requirements of die forging while also having the functions of entering and exiting the die forging hydraulic press and unloading materials. The worktable is transported using rollers, and the pressing load is transmitted to the lower surface of the worktable when it enters the pressing process. Die forging hydraulic presses require high positioning accuracy for the worktable. Currently, when the worktable enters the pressing station, a hydraulic lifting mechanism is used to align the bottom surface of the worktable with the top surface of the lower pad, causing the worktable's transport support wheels to disengage from the track, thus transferring the load from roller load during transport to bottom surface load during pressing. This method requires the addition of a hydraulic centering wedge mechanism and a worktable lifting mechanism to complete the positioning, centering, and locking functions, in addition to the push-pull cylinder drive of the worktable. This process is cumbersome and time-consuming, severely impacting the production cycle of die forgings.

[0004] Chinese utility model patent CN217912693U discloses a rapid positioning forging device, which can only achieve positioning of a fixed mold. Summary of the Invention

[0005] The present invention aims to solve the above-mentioned technical problems, thereby providing a process method for rapid positioning and self-locking of the moving worktable of a high-efficiency die forging hydraulic press.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] A process for rapid positioning and self-locking of the moving worktable of a die forging hydraulic press includes the following steps:

[0008] Step A: Make a mobile worktable. Rollers are installed at the four corners of the bottom of the mobile worktable. Double lugs are fixed to the middle of the front end of the mobile worktable. An upper groove is opened in the middle of the front end of the bottom of the mobile worktable. Upper sliding grooves are symmetrically opened on both sides of the rear end of the bottom of the mobile worktable.

[0009] Step B: Make the upper pad. Both the front and rear ends of the upper pad are stepped structures, and multiple U-shaped holes are opened on the lower step.

[0010] Step C: Make a lower pad. Both sides of the top surface of the lower pad have longitudinal through roller track grooves. The front end of the top surface of the lower pad has a downward groove corresponding to the upper groove. The rear end of the top surface of the lower pad has a downward groove corresponding to the upper groove. Vertical through positioning holes are made at the four corners of the lower pad. The positioning holes are located at both ends of the roller track grooves. Springs are installed in the positioning holes, and lifting blocks are installed on the springs.

[0011] Step D: Make two fixed tracks, and fix the roller track to the top surface of the fixed tracks;

[0012] Step E: Make front centering pins and rear centering pins with the same structure. The front centering pin is installed in the upper groove of the movable worktable, and the rear centering pin is installed in the lower groove of the lower pad.

[0013] Step F: Install the lower pad on the support base of the die forging hydraulic press. Install a fixed rail on the front end of the lower pad, with the roller rail and roller rail groove facing each other.

[0014] Step G: Install the upper pad on the movable worktable, install the movable worktable on the fixed rail, install the mold on the upper pad, and connect the double ear seat of the movable worktable to one end of the hydraulic cylinder through the connecting assembly. The other end of the hydraulic cylinder is installed on the fixed ear seat outside the fixed rail.

[0015] Step H: Place the blank in the mold, and the hydraulic cylinder drives the moving worktable to enter the lower pad. The front centering pin and the lower slide groove, the rear centering pin and the upper slide groove center and position the moving worktable and the lower pad respectively. The four rollers of the moving worktable are located on the four lifting blocks respectively.

[0016] Step 1: The pressing mechanism of the die forging hydraulic press presses down, the lifting block moves down, the lower part of the roller enters the positioning hole, and the moving worktable and the lower pad plate are attached and self-locked.

[0017] Step J: After forging is completed, the lower pressing mechanism of the die forging hydraulic press moves upward, the spring returns to its original position, and the lifting block and the moving worktable rise to their original height.

[0018] Step K: The hydraulic cylinder drives the moving worktable to retract from the die forging hydraulic press, so as to unload the finished product and load the new billet;

[0019] Step L, and repeat steps H-K for continuous production.

[0020] Compared with the prior art, the present invention, which adopts the above technical solution, has the following beneficial effects:

[0021] The moving worktable is driven by a hydraulic cylinder. Automatic centering and positioning are achieved by centering and positioning pins and slides set on the moving worktable and the lower pad. The moving worktable is simultaneously centered and positioned when it is sent into the pressing station. The pressing force of the hydraulic press is used to realize the synchronous conversion of the force surface of the moving worktable from the load supported by rollers to the bottom surface of the moving worktable and achieve self-locking.

[0022] Compared to traditional mobile worktables, this design omits the positioning, centering, and lifting power actuators; instead, it integrates these two actions into the mobile worktable's transmission braking and forging pressing actions. While fulfilling the mobile worktable's positioning, centering, pressing, and self-locking functions, it saves on the actuator's drive mechanism and operating time, significantly improving production efficiency, reducing manufacturing costs, and shortening the production cycle.

[0023] Furthermore, the optimized solution of the present invention is:

[0024] The spring is an adjustable nitrogen-loaded spring.

[0025] When the spring is in its free state, the top surface of the lifting block is flush with the bottom of the roller track groove.

[0026] The front centering pin includes an isosceles trapezoidal portion and a rectangular portion.

[0027] The front end of the upper slide groove and the rear end of the lower slide groove are both isosceles trapezoids.

[0028] A positioning blind hole is provided on the bottom surface of the lower pad, and a positioning pin is installed in the positioning blind hole.

[0029] The connecting assembly includes a strip-shaped first hinge block, a U-shaped second hinge block, a first hinge pin, and a second hinge pin. The double-ear seat is hinged to the first hinge block via the first hinge pin, and the first hinge block is hinged to the second hinge block via the second hinge pin. The second hinge block is installed at the end of the piston rod of the hydraulic cylinder.

[0030] The upper plate has multiple inverted T-shaped mounting grooves symmetrically opened at both ends of its upper surface. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0032] Figure 2 This is a bottom view of the mobile worktable according to an embodiment of the present invention;

[0033] Figure 3 This is a perspective view of the mobile worktable and the upper pad assembly according to an embodiment of the present invention;

[0034] Figure 4 This is a front view of the mobile worktable and upper pad assembly according to an embodiment of the present invention;

[0035] Figure 5 This is a perspective view of the connection between the lower pad and the fixed track in an embodiment of the present invention;

[0036] Figure 6 This is a front view of the connection between the lower pad and the fixed track in an embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the connection between the first hinge block and the second hinge block according to an embodiment of the present invention.

[0038] In the diagram: 1. Movable workbench; 1-1. Platform plate; 1-2. Wheel frame; 1-3. Double ear seat; 1-4. Upper groove; 1-5. Upper slide groove; 2. Wheel axle; 3. Roller; 4. Upper pad; 4-1. Mounting groove; 4-2. U-shaped hole; 5. Front centering pin; 6. Lower pad; 6-1. Roller track groove; 6-2. Lower slide groove; 6-3. Positioning hole; 7. Lifting block; 8. Nitrogen spring; 9. Positioning pin; 10. Fixed track; 10-1. Roller track; 11. First hinge pin; 11-1. Second hinge pin; 12. First hinge block; 13. Second hinge block; 14. Hydraulic cylinder; 15. Rear centering pin; 16. Fixed ear seat. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0040] See Figure 1 This embodiment describes a process for rapid positioning and self-locking of the moving worktable of a die forging hydraulic press, which is carried out according to the following steps:

[0041] Step A: Create the mobile workbench 1 ( Figure 2 , Figure 3 , Figure 4 As shown), it is a welded steel plate component, mainly composed of a rectangular platform plate 1-1, a wheel frame 1-2, and a double-ear seat 1-3. Wheel frames 1-2 are welded to the four corners of the bottom surface of the platform plate 1-1. Each wheel frame 1-2 consists of two upright plates. A roller 3 is placed between the two upright plates and rotatably connected to a wheel axle 2. Both ends of the wheel axle 2 are connected to the upright plates. The inner end of the roller 3 has a rim, which serves as a guide. A double-ear seat 1-3 is welded to the middle of the front end of the platform plate 1-1. An upper groove 1-4 is formed in the middle of the front end of the bottom surface of the platform plate 1-1. The rear end of the upper groove 1-4 is an isosceles trapezoid, and the front end is rectangular. Two upper sliding grooves 1-5 are symmetrically formed on both sides of the rear end of the bottom surface of the platform plate 1-1. The rear end of the upper sliding grooves 1-5 is open, and the front end is an isosceles trapezoid.

[0042] Step B: Fabricate the upper pad 4. The upper pad 4 is rectangular, and five inverted T-shaped mounting grooves 4-1 are symmetrically opened at both the front and rear ends of its upper surface. The end faces of both the front and rear ends of the upper pad 4 are stepped structures, and two U-shaped holes 4-2 are opened at each end of the lower step.

[0043] Step C, Make the lower pad 6 ( Figure 5 , Figure 6 As shown, it is rectangular, with rectangular notches in the middle of both the front and rear ends, and two blind positioning holes on the lower plate. Both sides of the top surface of the lower pad 6 have longitudinally penetrating roller track grooves 6-1, the distance between the two roller track grooves 6-1 being equal to the wheel distance between the rollers 3 on both sides of the movable worktable 1. The front end of the top surface of the lower pad 6 has a downward sliding groove 6-2 corresponding to the upper groove 1-4. The shape of the downward sliding groove 6-2 is the same as the upper sliding groove 1-5, with an open front end and an isosceles trapezoidal rear end. The rear end of the top surface of the lower pad 6 has a lower groove corresponding to the two upper sliding grooves 1-5, with the cross-section of the lower groove being the same as the upper groove 1-4, and an isosceles trapezoidal front end and a rectangular rear end. Vertically penetrating positioning holes 6-3 are opened at the four corners of the lower pad 6. The positioning holes 6-3 are located at both ends of the roller track groove 6-1. Two adjustable nitrogen springs 8 are installed in the positioning holes 6-3. Rectangular lifting blocks 7 are installed on the nitrogen springs 8. In the free state, the top surface of the lifting block 7 is flush with the bottom of the roller track groove 6-1.

[0044] Step D: Make two fixed tracks 10, which are welded steel plate components with an I-shaped cross section. A long strip roller track 10-1 is welded to the top surface of the track. The width of the roller track 10-1 corresponds to the width of the roller 3. Reinforcing ribs are welded at equal intervals between the upper and lower flange plates of the fixed track 10.

[0045] Step E: Fabricate the front centering pin 5 and the rear centering pin 15. The front centering pin 5 and the rear centering pin 15 have the same structure. The front centering pin 5 is composed of an isosceles trapezoidal part and a rectangular part, and its cross-section is the same as that of the upper groove 1-4. The corners of the front centering pin 5 and the rear centering pin 15 are rounded. Install the front centering pin 5 in the upper groove 1-4 of the platform plate 1-1. The lower end of the front centering pin 5 extends out of the bottom surface of the platform plate 1-1. The front centering pin 5 has a through hole and is connected to the platform plate 1-1 by a countersunk bolt. Install the rear centering pin 15 in the two lower grooves of the lower pad plate 6. The upper end of the rear centering pin 15 is higher than the upper surface of the lower pad plate 6.

[0046] Step F: Install the positioning pin 9 in the positioning blind hole of the lower pad 6, and install the lower pad 6 on the support base of the die forging hydraulic press. The positioning pin 9 is used for positioning the lower pad 6 and the support base. Two fixed rails 10 are installed at the front end of the lower pad 6, and the roller rail 10-1 is opposite to the roller rail groove 6-1.

[0047] Step G: Install the upper pad 4 on the movable worktable 1. The upper pad 4 is connected to the movable worktable 1 through U-shaped holes 4-2 and bolts. Positioning strips are welded to both sides of the upper pad 4 on the movable worktable 1. The movable worktable 1 is installed on the fixed track 10, and the rollers 3 are placed on the roller track 10-1. The mold is installed on the upper pad 4 and fixed by mounting grooves 4-1 and bolts. The double-ear seat 1-3 of the movable worktable 1 is connected to the piston rod of the hydraulic cylinder 14 through a connecting assembly. The connecting assembly mainly consists of a first hinge pin 11, a strip-shaped first hinge block 12, a second hinge pin 11-1, and a U-shaped second hinge block 13. Figure 7 As shown), the double ear seat 1-3 is hinged to the first hinge block 12 through the first hinge pin 11, and the first hinge block 12 is hinged to the second hinge block 13 through the second hinge pin 11-1. The second hinge block 13 is installed at the end of the piston rod of the hydraulic cylinder 14, and one end of the cylinder body of the hydraulic cylinder 14 is installed on the fixed ear seat 16 outside the fixed track 10.

[0048] Step H: Place the blank in the mold. The piston rod of the hydraulic cylinder 14 extends to drive the moving worktable 1 into the lower pad 6. The rollers 3 enter the roller track groove 6-1 from the roller track 10-1. The bottom of the roller track groove 6-1 has a wheel flange groove. The front centering pin 5 and the lower sliding groove 6-2, and the rear centering pin 15 and the upper sliding groove 1-5 slide in fit. The isosceles trapezoidal parts of the three centering pins match the isosceles trapezoidal ends of the three sliding grooves, thus centering and positioning the moving worktable 1 and the lower pad 6. The exposed length of the three centering pins is less than the depth of the three sliding grooves. The four rollers 3 of the moving worktable 6 are respectively located on the four lifting blocks 7. At this time, the moving worktable 6 is located at the pressing position. The nitrogen spring 8 provides support force. The support force provided by the nitrogen spring 8 is greater than the total weight of the moving worktable 1 and the items it carries. Therefore, the lifting blocks 7 maintain their original height and do not fall.

[0049] Step 1: The pressing mechanism of the forging hydraulic press presses down, the mold, the upper pad 4 and the moving worktable 1 move down and press down the lifting block 7. As the lifting block 7 moves down, the nitrogen spring 8 retracts, and the lower part of the roller 3 enters the positioning hole 6-3. The moving worktable 1 and the lower pad 6 are attached and self-locked. During the pressing process, the pressing force is much greater than the supporting force provided by the nitrogen spring 8. Therefore, the lifting block 7 falls from its original height until the lower plane of the moving worktable 1 is attached to the upper plane of the lower pad 6, thus realizing the self-locking function of the moving worktable 1 during the pressing process.

[0050] Step J: After forging is completed, the pressing mechanism of the die forging hydraulic press moves upward, the pressing force is released, the nitrogen spring 8 resets, and the lifting block 7 and the moving worktable 1 rise to their original height.

[0051] In step K, the piston rod of hydraulic cylinder 14 retracts, driving the moving worktable 1 to withdraw from the die forging hydraulic press, and unloading the finished product and loading the new billet;

[0052] Step L, and repeat steps H-K for continuous production.

[0053] The rapid positioning and self-locking process of this invention utilizes a hydraulic cylinder to drive a moving worktable, achieving automatic centering and positioning through centering pins and slides set on the moving worktable and the lower pad. The moving worktable is transferred to the pressing station via rollers. An adjustable nitrogen spring and lifting block are installed on the lower pad below the rollers at the pressing station. During transfer, the nitrogen spring's supporting force ensures that the entire weight of the moving worktable and its supporting components does not fall. During pressing, no other drive is needed; by increasing the pressing force on the moving worktable, the nitrogen spring is compressed until the bottom surface of the moving worktable is in contact with the top surface of the lower pad, completing the force transfer from the rollers to the bottom surface. This invention uses the moving worktable's transfer and pressing as the passive driving actuator for performing positioning and self-locking, combining the positioning and pushing / pull actions, and the moving worktable's lifting and pressing actions into one. This saves equipment manufacturing costs, shortens the steps in the die forging pressing process, and greatly improves forging production efficiency.

[0054] The above description is merely a preferred embodiment of the present invention and does not limit the scope of the present invention. All equivalent structural changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. A process method for rapid positioning and self-locking of the moving worktable of a die forging hydraulic press, comprising the following steps: Step A: Make a mobile worktable. Rollers are installed at the four corners of the bottom of the mobile worktable. Double lugs are fixed to the middle of the front end of the mobile worktable. An upper groove is opened in the middle of the front end of the bottom of the mobile worktable. Upper sliding grooves are symmetrically opened on both sides of the rear end of the bottom of the mobile worktable. Step B: Make the upper pad. Both the front and rear ends of the upper pad are stepped structures, and multiple U-shaped holes are opened on the lower step. Step C: Make a lower pad. Both sides of the top surface of the lower pad have longitudinal through roller track grooves. The front end of the top surface of the lower pad has a downward groove corresponding to the upper groove. The rear end of the top surface of the lower pad has a downward groove corresponding to the upper groove. Vertical through positioning holes are made at the four corners of the lower pad. The positioning holes are located at both ends of the roller track grooves. Springs are installed in the positioning holes, and lifting blocks are installed on the springs. Step D: Make two fixed tracks, and fix the roller track to the top surface of the fixed tracks; Step E: Make front centering pins and rear centering pins with the same structure. The front centering pin is installed in the upper groove of the movable worktable, and the rear centering pin is installed in the lower groove of the lower pad. Step F: Install the lower pad on the support base of the die forging hydraulic press. Install a fixed rail on the front end of the lower pad, with the roller rail and roller rail groove facing each other. Step G: Install the upper pad on the movable worktable, install the movable worktable on the fixed rail, install the mold on the upper pad, and connect the double ear seat of the movable worktable to one end of the hydraulic cylinder through the connecting assembly. The other end of the hydraulic cylinder is installed on the fixed ear seat outside the fixed rail. Step H: Place the blank in the mold, and the hydraulic cylinder drives the moving worktable to enter the lower pad. The front centering pin and the lower slide groove, the rear centering pin and the upper slide groove center and position the moving worktable and the lower pad respectively. The four rollers of the moving worktable are located on the four lifting blocks respectively. Step 1: The pressing mechanism of the die forging hydraulic press presses down, the lifting block moves down, the lower part of the roller enters the positioning hole, and the moving worktable and the lower pad plate are attached and self-locked. Step J: After forging is completed, the lower pressing mechanism of the die forging hydraulic press moves upward, the spring returns to its original position, and the lifting block and the moving worktable rise to their original height. Step K: The hydraulic cylinder drives the moving worktable to retract from the die forging hydraulic press, so as to unload the finished product and load the new billet; Step L, repeat steps H-K for continuous production; When the spring is in its free state, the top surface of the lifting block is flush with the bottom of the roller track groove. A positioning blind hole is provided on the bottom surface of the lower pad, and a positioning pin is installed in the positioning blind hole; The upper plate has multiple inverted T-shaped mounting grooves symmetrically opened at both ends of its upper surface.

2. The process method for rapid positioning and self-locking of the moving worktable of the die forging hydraulic press according to claim 1, characterized in that: The spring is a nitrogen spring.

3. The process method for rapid positioning and self-locking of the moving worktable of the forging hydraulic press according to claim 1, characterized in that: The front centering pin includes an isosceles trapezoidal portion and a rectangular portion.

4. The process method for rapid positioning and self-locking of the moving worktable of the forging hydraulic press according to claim 1, characterized in that: The front end of the upper slide groove and the rear end of the lower slide groove are both isosceles trapezoids.

5. The process method for rapid positioning and self-locking of the moving worktable of the forging hydraulic press according to claim 1, characterized in that: The connecting assembly includes a strip-shaped first hinge block, a U-shaped second hinge block, a first hinge pin, and a second hinge pin. The double-ear seat is hinged to the first hinge block via the first hinge pin, and the first hinge block is hinged to the second hinge block via the second hinge pin. The second hinge block is installed at the end of the piston rod of the hydraulic cylinder.

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