Bending device for reducing stainless steel bending die marks and bending method thereof

Abstract

The invention discloses a bending device for reducing stainless steel bending die marks and a bending method thereof, and relates to the technical field of machining, the bending device comprises a positioning seat, lower fixing dies are symmetrically installed on the upper portion of the positioning seat left and right, and a plurality of lifting reset assemblies are installed on the side walls of the lower fixing dies; a lower moving die is installed in the middle of the lifting reset assembly, a downward pressing and bending assembly is arranged above the lower moving die, a bending protection film is arranged on the upper surface of the lower fixed die, and an adsorption assembly used for adsorbing and positioning the bending protection film is installed in the lower fixed die. The other side wall of the lower fixed die is provided with a roller body assembly used for guiding and bending a protective film. The bending protective film solves the problems that an existing bending protective film is difficult to protect a non-V-shaped workpiece and a die, the protective film is difficult to be effectively attached between the non-V-shaped workpiece and the die, and even normal operation of the bending process is affected.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a bending device and a bending method for reducing stainless steel bending die marks. Background Art

[0002] Bending: Under the pressure of the upper or lower die of the bending machine, the metal sheet first undergoes elastic deformation and then enters plastic deformation. At the beginning of plastic bending, the sheet is bent freely. As the upper or lower die applies pressure to the sheet, the sheet and the inner surface of the V-groove of the lower die gradually come close to form a bent part.

[0003] During the bending process of metal, plastic and other materials, the friction between the workpiece and the bending mold often causes scratches, indentations and other damages on the workpiece surface. For products with high requirements on appearance, mold marks will greatly affect the appearance of the product.

[0004] In the prior art, a bending protection film is placed between the workpiece and the mold to effectively reduce friction and avoid damage to the workpiece surface. However, it is difficult for the bending protection film to protect the non-V-shaped workpiece and the mold. The protection film is difficult to effectively stick between the two, and may even affect the normal progress of the bending process.

[0005] To this end, a bending device and a bending method for reducing the bending die mark of stainless steel are provided. Summary of the invention

[0006] The object of the present invention is to provide a bending device and a bending method for reducing stainless steel bending die marks, so as to solve the problem proposed in the above background technology that the existing bending protective film is difficult to protect the non-V-shaped workpiece and the mold, the protective film is difficult to effectively adhere between the two, and even affects the normal progress of the bending process.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a bending device for reducing the bending die mark of stainless steel, comprising a positioning seat, a lower fixed die is symmetrically installed above the positioning seat, a plurality of lifting and resetting components are installed on the side walls of the lower fixed die, a lower movable die is installed at the middle position of the lifting and resetting components, a downward pressure bending component is arranged above the lower movable die, a bending protective film is arranged on the upper surface of the lower fixed die, an adsorption component for adsorbing and positioning the bending protective film is installed inside the lower fixed die, and a roller body component for guiding the bending protective film is installed on the other side wall of the lower fixed die.

[0008] Preferably, a cavity is provided inside the lower fixed mold, a bending slope portion and a bending plane portion are provided on the upper surface of the lower fixed mold, and a plurality of adsorption holes arranged at intervals laterally are provided on the outer walls of the bending slope portion and the bending plane portion.

[0009] Preferably, the adsorption assembly includes a negative pressure adsorption tube, and the negative pressure adsorption tube is installed in the cavity, a suction port is provided on the outer wall of the negative pressure adsorption tube, and the suction port is attached to the inner side of the adsorption hole, and one end of the negative pressure adsorption tube is provided with an exhaust pipe extending to the outside.

[0010] Preferably, a long strip-shaped inlet and outlet for the bent protective film to enter and exit is opened on the outer wall of the bent inclined portion, and a first unwinding roller is installed at the lower side of the inlet and outlet.

[0011] Preferably, the roller assembly includes a bracket, a first winding roller is mounted on the outer wall of the bracket, a motor is mounted at one end of the first winding roller, a limiting roller is symmetrically mounted above the first winding roller, and a guide roller is mounted above the limiting roller.

[0012] Preferably, end frames are installed at both ends of the lower movable mold, a second winding roller and a second unwinding roller are installed on the outer wall of the end frame, and a pressure roller is installed below the second winding roller and the second unwinding roller.

[0013] Preferably, the lifting and resetting assembly includes a lifting groove opened on the side wall of the lower fixed mold, a lifting slider is installed inside the lifting groove, and the lifting slider is installed in combination with the side wall of the lower movable mold through bolts, and a reset spring is installed below the lifting slider.

[0014] Preferably, the push-down bending assembly comprises an upper die, an assembly rack is arranged above the upper die, and a slot is provided on a side wall of the assembly rack.

[0015] Preferably, a clamp is installed on the outer wall of the assembly frame, a clamp block inserted into the clamping slot is provided at one end of the clamp, and a driving member for lifting and displacing is installed above the clamp.

[0016] Preferably, a bending method of a bending device for reducing stainless steel bending die marks comprises the following steps:

[0017] Step 1: Wind one end of the bending protective film at the lower fixed mold on the first unwinding roller, extend the bending protective film outward from the inlet and outlet, and wind the other end of the bending protective film on the first winding roller, and guide and limit the film body through the limiting roller and the guide roller;

[0018] Step 2: Winding the two ends of the bending protective film at the lower movable die on the second winding roller and the second unwinding roller respectively, and pressing it down on the upper surface of the lower movable die through the pressing roller;

[0019] Step 3: Connect the vacuum pipe of the negative pressure adsorption tube to the vacuum equipment, and draw the gas at the bent protective film downward from the adsorption hole into the negative pressure adsorption tube, and then extract it from the vacuum pipe, so that the bent protective film is adsorbed on the upper surface of the lower fixed mold;

[0020] Step 4: The metal sheet is placed between the bending protection film and the downward pressure bending assembly. The driving part drives the upper die to move downward, so that the upper die contacts and presses down the workpiece. With the influence of the downward pressure from above, the lifting slider moves downward, compresses the reset spring, and moves the lower moving die to the bottom. During the displacement process, the metal sheet is deformed by the downward pressure and the upper and lower die bodies to form a bent part.

[0021] Step 5: After bending, the driving part drives the upper die to rise, and the reset spring lacks downward pressure restriction and resets upward, pushing the lifting slider to move upward in the lifting slot, driving the lower movable die to reset upward to the initial position;

[0022] Step 6: The first winding roller and the second winding roller drive the bending protection film to move by winding, and move the new bending protection film to the bottom of the bending area.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) In the present invention, the bending protective film at the lower fixed mold is displaced, placed and restricted by the roller assembly, wherein the bending protective film is placed by setting a first unwinding roller, the film body is passed through the inlet and outlet to the outside of the lower fixed mold, the position of the bending protective film is limited and guided by the limiting roller and the guide roller, and the bending protective film is pulled and displaced by the first winding roller; the bending protective film at the lower movable mold is pulled and displaced by the second winding roller and the second unwinding roller, and the bending protective film is limited by the pressure roller; the device is limited by the rollers, so that the position of the film body can be limited, so that the film body is more closely attached to the lower fixed mold and the lower movable mold. Since it is suitable for the bending shape of non-V-type bending parts composed of the lower fixed mold and the lower movable mold, it can also achieve the displacement of the bending protective film by winding and unwinding, so as to facilitate the replacement of the bending protective film.

[0025] (2) In the present invention, the bending protection film is adsorbed by setting up an adsorption component, and the exhaust pipe is connected to the exhaust equipment, and the gas is drawn downward into the negative pressure adsorption tube through the adsorption hole, so that the bending protection film is adsorbed on the special-shaped mold containing the bending inclined portion and the bending flat portion.

[0026] (3) In the present invention, by setting up the lifting and resetting components, the lower die of the bending device can have displacement and resetting functions, and the metal sheet can be effectively bent by lifting and displacing. Compared with the fixed bending process, the displacement can reduce the generation of bending die marks. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the placement state of the bending protection film of the present invention;

[0029] Figure 3 It is a schematic diagram of the lower fixed mold structure of the present invention;

[0030] Figure 4 It is a schematic diagram of the structure of the lower fixed mold and the lifting and resetting assembly of the present invention;

[0031] Figure 5 It is a schematic diagram of the structure of the roller assembly of the present invention;

[0032] Figure 6 It is a schematic diagram of the structure of the adsorption component of the present invention;

[0033] Figure 7 It is a schematic diagram of the structure of the lower movable mold of the present invention;

[0034] Figure 8 It is a schematic diagram of the structure of the downward pressing bending assembly of the present invention;

[0035] In the figure: 1. lower fixed die; 101. cavity; 102. bending slope; 103. bending plane; 104. first unwinding roller; 105. inlet and outlet; 106. adsorption hole; 2. lifting and resetting assembly; 201. lifting slot; 202. lifting slider; 203. resetting spring; 3. pressing and bending assembly; 301. upper die; 302. assembly frame; 303. slot; 304. fixture; 305. clamping block ; 306, driving member; 4, roller assembly; 401, bracket; 402, first winding roller; 403, motor; 404, limit roller; 405, guide roller; 5, lower movable mold; 501, end frame; 502, second winding roller; 503, pressure roller; 504, second unwinding roller; 6, adsorption assembly; 601, negative pressure adsorption tube; 602, suction port; 603, exhaust pipe; 7, bending protection film; 8, positioning seat. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] See also Figure 1-8, an embodiment of the present invention: a bending device for reducing the bending die mark of stainless steel, comprising a positioning seat 8, a lower fixed die 1 is symmetrically installed above the positioning seat 8, a bending protection film 7 is arranged on the upper surface of the lower fixed die 1, a cavity 101 is opened inside the lower fixed die 1, a bending slope portion 102 and a bending plane portion 103 are arranged on the upper surface of the lower fixed die 1, a roller assembly 4 for guiding the bending protection film 7 is installed on the other side wall of the lower fixed die 1, a long strip inlet and outlet 105 for the bending protection film 7 to enter and exit is opened on the outer wall of the bending slope portion 102, and the inlet and outlet A first unwinding roller 104 is installed at the lower side of 105, and the roller assembly 4 includes a bracket 401, a first winding roller 402 is installed on the outer wall of the bracket 401, a motor 403 is installed at one end of the first winding roller 402, and a limit roller 404 is installed symmetrically above the first winding roller 402, and a guide roller 405 is installed above the limit roller 404; end frames 501 are installed at both ends of the lower movable mold 5, and a second winding roller 502 and a second unwinding roller 504 are installed on the outer wall of the end frame 501, and a pressure roller 503 is installed below the second winding roller 502 and the second unwinding roller 504;

[0038] The bending protective film 7 at the lower fixed mold 1 is displaced, placed and restricted by the roller assembly 4, wherein the bending protective film 7 is placed by setting a first unwinding roller 104, and the film body is allowed to pass through the inlet and outlet 105 to the outside of the lower fixed mold 1, and the position of the bending protective film 7 is limited and guided by the limiting roller 404 and the guide roller 405, and the bending protective film 7 is pulled and displaced by the first winding roller 402; the bending protective film 7 at the lower movable mold 5 is pulled and displaced by the second winding roller 502 and the second unwinding roller 504, and the bending protective film 7 is limited by the pressure roller 503; the device is able to limit the position of the film body through the restriction between the rollers, so that the film body is more closely attached to the lower fixed mold 1 and the lower movable mold 5, because it is suitable for the bending shape of non-V-type bending parts composed of the lower fixed mold 1 and the lower movable mold 5, in addition, it can also achieve the displacement of the bending protective film 7 by winding and unwinding, so as to facilitate the replacement of the bending protective film 7;

[0039] Furthermore, a plurality of adsorption holes 106 arranged at intervals in the transverse direction are provided on the outer walls of the bending slope portion 102 and the bending plane portion 103, and an adsorption assembly 6 for adsorbing and positioning the bending protection film 7 is installed inside the lower fixed mold 1, and the adsorption assembly 6 includes a negative pressure adsorption tube 601, and the negative pressure adsorption tube 601 is installed in the cavity 101, and a suction port 602 is provided on the outer wall of the negative pressure adsorption tube 601, and the suction port 602 is close to the inner side of the adsorption hole 106, and one end of the negative pressure adsorption tube 601 is provided with an exhaust pipe 603 extending to the outside;

[0040] On the basis of the roller body restriction, the bending protection film 7 is adsorbed by the setting of the adsorption component 6, the exhaust pipe 603 is connected to the exhaust device, and the gas is drawn downward to the negative pressure adsorption pipe 601 through the adsorption hole 106, so that the bending protection film 7 is adsorbed on the special-shaped mold including the bending inclined portion 102 and the bending plane portion 103;

[0041] A downward pressing bending assembly 3 is arranged above the lower movable die 5, the downward pressing bending assembly 3 includes an upper die 301, an assembly frame 302 is arranged above the upper die 301, a slot 303 is provided on the side wall of the assembly frame 302, a fixture 304 is installed on the outer wall of the assembly frame 302, a block 305 inserted into the slot 303 is arranged at one end of the fixture 304, and a driving member 306 for lifting and displacement is installed above the fixture 304; a plurality of lifting and resetting assemblies 2 are installed on the side wall of the lower fixed die 1, the lifting and resetting assemblies 2 include a lifting groove 201 provided on the side wall of the lower fixed die 1, a lifting slider 202 is installed inside the lifting groove 201, and the lifting slider 202 is assembled and installed with the side wall of the lower movable die 5 by bolts, a reset spring 203 is installed below the lifting slider 202, and the lower movable die 5 is installed at the middle position of the lifting and resetting assembly 2;

[0042] The clamp 304 is assembled with the assembly frame 302 by inserting the block 305 of the clamp 304 into the slot 303 of the assembly frame 302, and the upper die 301 is driven to move up and down by the driving member 306. During the bending process, the driving member 306 drives the upper die 301 downward to move to the metal sheet, and the metal sheet is placed between the bending protection film 7 and the upper die 301. As the upper die 301 descends, the upper die 301 contacts and presses down the workpiece, and drives the lifting slide block 202 to move downward, compressing the reset spring 203, so that the lower movable die 5 Move to the bottom, during the displacement process, the metal sheet is deformed by the downward pressure and the upper and lower mold bodies to form a bent part. After bending, the driving member 306 drives the upper mold 301 to rise, and the reset spring 203 lacks the downward pressure restriction and resets upward, pushing the lifting slider 202 to move upward in the lifting slot 201, driving the lower movable mold 5 to reset upward to the initial position; the above-mentioned structure can effectively bend the metal sheet by lifting and displacement. Compared with the fixed bending process, it can reduce the generation of bending mold marks by displacement;

[0043] The driving member 306 is a component with lifting and displacement functions such as an electric cylinder, a pneumatic cylinder, and an electric telescopic rod.

[0044] See also Figure 1-8 A bending method of a bending device for reducing stainless steel bending die marks, comprising the following steps:

[0045] Step 1: Wrap one end of the bending protection film 7 at the lower fixed mold 1 on the first unwinding roller 104, extend the bending protection film 7 outward from the inlet and outlet 105, and wrap the other end of the bending protection film 7 on the first winding roller 402, and guide and limit the film body through the limiting roller 404 and the guide roller 405;

[0046] Step 2: Wind the two ends of the bending protection film 7 at the lower movable die 5 on the second winding roller 502 and the second unwinding roller 504 respectively, and press it down on the upper surface of the lower movable die 5 through the pressing roller 503;

[0047] Step 3: Connect the vacuum pipe 603 of the negative pressure adsorption tube 601 to the vacuum device, and draw the gas at the bent protective film 7 downward from the adsorption hole 106 into the negative pressure adsorption tube 601, and be drawn out by the vacuum pipe 603, so that the bent protective film 7 is adsorbed on the upper surface of the lower fixed mold 1;

[0048] Step 4: The metal sheet is placed between the bending protection film 7 and the downward pressing bending assembly 3, and the driving member 306 drives the upper die 301 to move downward, so that the upper die 301 contacts and presses down the workpiece. With the influence of the downward pressure from above, the lifting slider 202 is driven to move downward, and the return spring 203 is compressed, so that the lower movable die 5 moves to the bottom. During the displacement process, the metal sheet is deformed by the downward pressure and the upper and lower die bodies to form a bent part;

[0049] Step 5: After bending, the driving member 306 drives the upper die 301 to rise, and the return spring 203 lacks downward pressure restriction and returns upward, pushing the lifting slide 202 to move upward in the lifting slot 201, driving the lower movable die 5 to return upward to the initial position;

[0050] Step 6: The first winding roller 402 and the second winding roller 502 drive the bending protection film 7 to move by winding, and move the new bending protection film 7 to the bottom of the bending area.

[0051] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A bending device for reducing the bending die mark of stainless steel, comprising a positioning seat (8), characterized in that: A lower fixed mold (1) is symmetrically installed above the positioning seat (8), a plurality of lifting and resetting components (2) are installed on the side wall of the lower fixed mold (1), a lower movable mold (5) is installed at the middle position of the lifting and resetting component (2), a downward pressing bending component (3) is arranged above the lower movable mold (5), a bending protection film (7) is arranged on the upper surface of the lower fixed mold (1), an adsorption component (6) for adsorbing and positioning the bending protection film (7) is installed inside the lower fixed mold (1), and a roller body component (4) for guiding the bending protection film (7) is installed on the other side wall of the lower fixed mold (1).

2. A bending device for reducing stainless steel bending die marks according to claim 1, characterized in that: The lower fixed mold (1) has a cavity (101) formed inside, and the upper surface of the lower fixed mold (1) is provided with a bending slope portion (102) and a bending plane portion (103), and the outer walls of the bending slope portion (102) and the bending plane portion (103) are provided with a plurality of adsorption holes (106) arranged at intervals in the transverse direction.

3. A bending device for reducing stainless steel bending die marks according to claim 2, characterized in that: The adsorption component (6) comprises a negative pressure adsorption tube (601), and the negative pressure adsorption tube (601) is installed in the cavity (101), a suction port (602) is arranged on the outer wall of the negative pressure adsorption tube (601), and the suction port (602) is close to the inner side of the adsorption hole (106), and one end of the negative pressure adsorption tube (601) is provided with an exhaust pipe (603) extending to the outside.

4. A bending device for reducing stainless steel bending die marks according to claim 3, characterized in that: The outer wall of the bending slope portion (102) is provided with a long strip-shaped inlet and outlet (105) for the bending protection film (7) to enter and exit, and a first unwinding roller (104) is installed at the lower side of the inlet and outlet (105).

5. A bending device for reducing stainless steel bending die marks according to claim 4, characterized in that: The roller assembly (4) comprises a bracket (401), a first winding roller (402) is mounted on the outer wall of the bracket (401), a motor (403) is mounted on one end of the first winding roller (402), a limiting roller (404) is symmetrically mounted above the first winding roller (402), and a guide roller (405) is mounted above the limiting roller (404).

6. A bending device for reducing stainless steel bending die marks according to claim 5, characterized in that: End frames (501) are installed at both ends of the lower movable mold (5), and a second winding roller (502) and a second unwinding roller (504) are installed on the outer wall of the end frame (501), and a pressure roller (503) is installed below the second winding roller (502) and the second unwinding roller (504).

7. A bending device for reducing stainless steel bending die marks according to claim 6, characterized in that: The lifting and resetting assembly (2) comprises a lifting groove (201) formed on the side wall of the lower fixed mold (1); a lifting slider (202) is installed inside the lifting groove (201); the lifting slider (202) is assembled and installed with the side wall of the lower movable mold (5) by means of bolts; and a resetting spring (203) is installed below the lifting slider (202).

8. A bending device for reducing stainless steel bending die marks according to claim 7, characterized in that: The downward pressing bending assembly (3) comprises an upper die (301), an assembly frame (302) is arranged above the upper die (301), and a clamping slot (303) is provided on the side wall of the assembly frame (302).

9. A bending device for reducing stainless steel bending die marks according to claim 8, characterized in that: A clamp (304) is installed on the outer wall of the assembly frame (302), a clamp block (305) inserted into the clamp slot (303) is arranged at one end of the clamp (304), and a driving member (306) for lifting and displacing is installed above the clamp (304).

10. A bending method for a bending device for reducing stainless steel bending die marks, based on the bending device for reducing stainless steel bending die marks according to claim 9, characterized in that: The following steps are involved: Step 1: Wind one end of the bending protection film (7) at the lower fixed mold (1) on the first unwinding roller (104), extend the bending protection film (7) outward from the inlet and outlet (105), and wind the other end of the bending protection film on the first winding roller (402), and guide and limit the film body through the limiting roller (404) and the guide roller (405); Step 2: Winding the two ends of the bending protection film (7) at the lower movable mold (5) on the second winding roller (502) and the second unwinding roller (504) respectively, and pressing it down on the upper surface of the lower movable mold (5) through the pressing roller (503); Step 3: Connect the vacuum pipe (603) of the negative pressure adsorption tube (601) to the vacuum device, and draw the gas at the bending protection film (7) downward from the adsorption hole (106) into the negative pressure adsorption tube (601), and then extract it from the vacuum pipe (603), so that the bending protection film (7) is adsorbed on the upper surface of the lower fixed mold (1); Step 4: The metal sheet is placed between the bending protection film (7) and the downward bending assembly (3), and the driving member (306) drives the upper mold (301) to move downward, so that the upper mold (301) contacts and presses down the workpiece. With the influence of the downward pressure from above, the lifting slider (202) is driven to move downward, compressing the return spring (203) so that the lower movable mold (5) moves to the bottom. During the displacement process, the metal sheet is deformed by the downward pressure and the restriction of the upper and lower mold bodies to form a bent part; Step 5: After bending, the driving member (306) drives the upper die (301) to rise, and the return spring (203) lacks downward pressure restriction and returns to the original position, pushing the lifting slider (202) to move upward in the lifting slot (201), driving the lower movable die (5) to return to the original position upward; Step six: The first winding roller (402) and the second winding roller (502) drive the bending protection film (7) to move by winding, and move the new bending protection film (7) to the bottom of the bending area.

Images