Machining method for carrying out negative angle bending adjustment on workpiece

Abstract

The invention discloses a processing method for performing negative angle bending adjustment on a workpiece, which is characterized in that a first upper ejector rod, a stripper plate inclined slide block and a second upper ejector rod are arranged on an upper die part of a die, the stripper plate inclined slide block is arranged on a stripper plate in a sliding manner, and the bottom of the first upper ejector rod acts on the stripper plate inclined slide block; the lower die part is provided with a female die inclined sliding block, a female die floating block and a lower ejector rod. The female die inclined sliding block is provided with a guide sliding face facing the to-be-bent part of the workpiece. The top of the lower ejector rod elastically acts on the female die inclined sliding block, and the female die floating block is arranged on the lower die base in a sliding mode through a bottom spring. In the mold closing process, the inclined sliding block of the discharging plate is embedded into the right side inside position of the bent part of the workpiece to form a support; then, the discharging plate moves downwards to the position of a lower dead center, and pressing and positioning of the workpiece are completed; and then the upper die base drives a second upper ejector rod to press a concave die inclined sliding block downwards, so that the concave die inclined sliding block moves downwards in an inclined mode, and negative-angle bending adjustment is conducted on the to-be-bent part of the workpiece till the die moves to be in a completely closed state.

Description

Technical Field

[0001] The invention relates to the technical field of metal forming technology, and in particular to a processing method for performing negative angle bending adjustment on a workpiece. Background Art

[0002] In the field of metal forming, negative angle bending of workpieces is a common processing requirement. The conventional solution for negative angle bending of workpieces is to rotate the product by an angle to eliminate the negative angle. However, since the reference surface and reference hole of the product are also rotated after rotation, it is necessary to punch holes on the side or rotate the product again for blanking, which has many and complicated processes.

[0003] Using a progressive die to side-punch a workpiece using a side-adjusting wedge is also a bending process. However, the conventional side-adjusting wedge is too large, and the space of the progressive die is limited, so it is necessary to add an empty step to make room for a larger die for installation. Therefore, the present invention designs a progressive die structure for adjusting a negative angle bend of a workpiece, which occupies a small space, is particularly suitable for such negative angle bending in a narrow space, and is convenient for installation and die debugging in production. Summary of the invention

[0004] The purpose of the present invention is to provide a processing method for adjusting the negative angle bending of a workpiece in order to solve the problem that the conventional standard wedge cannot be installed in the intermediate progressive die space in the prior art.

[0005] The technical solution adopted to achieve the purpose of the present invention is:

[0006] A processing method for adjusting a negative angle bending of a workpiece, comprising an upper die part and a lower die part:

[0007] The upper die part includes an upper die seat, a stripper plate, a first upper ejector rod, a stripper plate inclined slide block, a first stripper plate fixing block, a second stripper plate fixing block and a second upper ejector rod;

[0008] The unloading plate is slidably connected to the upper die seat through the first upper ejector rod and the second upper ejector rod, and the unloading plate oblique sliding block is slidably arranged on the unloading plate; the first upper ejector rod is vertically slidably installed in the unloading plate and the upper die seat, and an upper ejector rod limit block is arranged on the top of the first upper ejector rod to limit the cut-off direction of the downward movement of the first upper ejector rod, and a spring is also arranged on the top of the first upper ejector rod to provide a downward elastic force for the first upper ejector rod, so that the bottom of the first upper ejector rod acts on the unloading plate oblique sliding block;

[0009] The first stripper plate fixing block and the second stripper plate fixing block are fixedly arranged on the stripper plate and slidably cooperate with the stripper plate inclined slider; the top end of the second upper ejector rod is fixedly installed on the upper die seat, and its rod body is slidably installed with the second stripper plate fixing block;

[0010] A limit top plate is also fixedly installed on the top of the unloading plate, and the limit top plate is used to limit the upward sliding limit position of the unloading plate inclined sliding block, and to locate the first unloading plate fixing block and the second unloading plate fixing block on the unloading plate. Fixed installation position;

[0011] The lower die part includes a lower die seat, a die oblique slide block, a die floating block, a lower ejector rod, a first die fixing block and a second die fixing block;

[0012] The first die fixing block is fixedly arranged on the lower die seat, and the die oblique sliding block is slidably connected to the first die fixing block; the die oblique sliding block is provided with a guide sliding surface for extruding in the negative angle bending direction of the workpiece; the lower ejector rod is vertically slidably installed on the lower die seat, and a limit portion is also provided at the bottom end of the lower ejector rod to limit the upward cut-off direction of the lower ejector rod, and a spring is provided at the bottom of the lower ejector rod to provide an upward elastic force for the lower ejector rod, so that the top of the lower ejector rod acts on the die oblique sliding block; the die floating block is slidably arranged on the lower die seat, and a spring is provided at the bottom of the die floating block to provide an upward elastic force for the die floating block; the second die fixing block is fixedly arranged on the lower die seat, and is slidably connected to the die floating block;

[0013] The working process is as follows:

[0014] Step 1: The upper die and the lower die are closed, and the bottom of the workpiece is supported by the die lifting block. During the closing process, the upper die moves downward, and the inclined slider of the unloading plate begins to contact the right bottom surface of the part to be bent of the workpiece;

[0015] Step 2: As the upper die part continues to move downward, the oblique slider of the stripper plate is subjected to the upward force of the workpiece. Since the spring force at the bottom of the die floating block is greater than the spring force at the top of the first upper ejector rod, the spring at the top of the first upper ejector rod is compressed, and the oblique slider of the stripper plate remains stationary, while the upper die seat and the stripper plate continue to move downward, so that the shaping protrusion at the bottom of the first stripper plate fixed block and the oblique slider of the stripper plate are embedded in the right inner position of the bending part of the workpiece to form a sufficient fit support;

[0016] Step 3, as the upper die part continues to move downward, the stripper plate moves downward to the bottom dead center position. At this time, the stripper plate and the first stripper plate fixing block and the stripper plate inclined sliding block thereon completely press the workpiece onto the second die fixing block, completing the pressure positioning of the workpiece;

[0017] Step 4: The upper die seat continues to move downward, and the upper die seat drives the second upper ejector rod to press down the inclined slider of the die. During this process, the spring at the bottom of the lower ejector rod at the bottom of the inclined slider of the die is compressed, and the inclined slider of the die moves obliquely downward along the first die fixed block to adjust the part of the workpiece to be bent, and the 90-degree angle is folded into a negative angle until the mold moves to a fully closed state.

[0018] In the above technical solution, when the mold reaches a fully closed state, the upper mold base will apply pressure to the stripper plate, so that the stripper plate and the first stripper plate fixing block and the stripper plate inclined sliding block thereon further pressurize and shape the workpiece, so that the workpiece achieves higher precision.

[0019] In the above technical solution, an inclined surface is arranged on the inclined sliding block of the unloading plate, and slidingly cooperates with the first unloading plate fixed block.

[0020] In the above technical solution, a downward shaping protrusion is provided at the bottom of the first stripper plate fixing block, and the shaping protrusion and the stripper plate inclined sliding block are used to ensure sufficient fitting support for the right inner position of the workpiece bending part during the mold closing process.

[0021] In the above technical solution, a limit block is arranged at the bottom end of the second unloading plate fixed block, which is slidably matched with the limit block arranged at the top end of the unloading plate inclined sliding block.

[0022] In the above technical solution, an inclined sliding surface is provided on one side of the inclined sliding block of the die, and a vertical surface limiting portion is also provided at the bottom end of the inclined sliding surface to ensure that the inclined sliding block of the die will not deviate obliquely upward in the initial state.

[0023] In the above technical solution, a limiting step is provided at the bottom end of the die floating block.

[0024] In the above technical solution, a limiting step cooperating with the limiting step of the die floating block is provided at the bottom end of the second die fixing block to limit the upward distance of the die floating block. The second die fixing block is also provided with an inclined surface cooperating with the bottom of the workpiece.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The progressive die structure for adjusting the negative angle bending of a workpiece of the present invention adopts the method of first pre-bending upward to a vertical angle with the horizontal direction, and then using a side adjustment mechanism to bend a negative angle of 5°.

[0027] 2. The progressive die structure for adjusting the negative angle bending of a workpiece of the present invention occupies a small space, is particularly suitable for such negative angles in a narrow space, and is convenient for installation and die debugging in production. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the working step 1 state of the mold used for negative angle bending adjustment of the workpiece of the present invention.

[0029] Figure 2 The figure is a schematic diagram of the key parts of the mold used for adjusting the negative angle bending of the workpiece according to the present invention.

[0030] Figure 3This is a schematic diagram of the working step 2 state of the mold used for negative angle bending adjustment of the workpiece in the present invention.

[0031] Figure 4 This is a schematic diagram of the working step 3 state of the mold used for negative angle bending adjustment of the workpiece in the present invention.

[0032] Figure 5 This is a schematic diagram of the working step 4 state of the mold used for negative angle bending adjustment of the workpiece of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] Reference Figure 1 and attached Figure 2 , a processing method for adjusting a negative angle bending of a workpiece, comprising an upper die part and a lower die part:

[0035] The upper die part includes an upper die base 1, a stripper plate 2, a first upper ejector rod 3, a stripper plate inclined sliding block 4, a first stripper plate fixing block 5, a second stripper plate fixing block 6 and a second upper ejector rod 7.

[0036] The stripper plate 2 is slidably connected to the upper die base 1 via a first upper ejector rod 3 and a second upper ejector rod 7. The stripper plate inclined slider 4 is slidably disposed on the stripper plate 2. The stripper plate 2 is provided with a mounting groove for mounting the stripper plate inclined slider 4.

[0037] The first upper push rod 3 is vertically slidably installed in the unloading plate 2 and the upper mold base 1. A spring is arranged on the top of the first upper push rod 3 to provide a downward elastic force for the first upper push rod 3, and an upper push rod limit block 31 is arranged on the top of the first upper push rod 3 to limit the cut-off direction of the downward movement of the first upper push rod 3. Through the spring, the bottom of the first upper push rod 3 acts on the unloading plate inclined slide block 4.

[0038] The first unloading plate fixing block 5 is fixedly set on the unloading plate 2, and slidingly cooperates with the unloading plate inclined slider inclined surface 41 set on the unloading plate inclined slider 4. Furthermore, a downward shaping protrusion 51 is set at the bottom of the first unloading plate fixing block 5. The shaping protrusion 51 and the unloading plate inclined slider 4 are used to ensure that the right internal position of the bending part of the workpiece 8 is fully fitted and supported during the mold closing process, so as to control the molding accuracy of the workpiece 8, which is beneficial to fully pressurize and shape the inside of the workpiece 8 during the mold lowering process.

[0039] The second unloading plate fixing block 6 is fixedly set on the unloading plate 2, and a second unloading plate fixing block limit block 61 is set at the bottom end of the second unloading plate fixing block 6, which cooperates with the limit block 42 set at the top end of the unloading plate inclined sliding block 4 to prevent the unloading plate inclined sliding block 4 from sliding downward in the initial state; the top end of the second upper push rod 7 is fixedly installed on the upper mold base 1, and the rod body is slidably installed with the second unloading plate fixing block 6.

[0040] A limiting top plate 21 is also fixedly installed on the top of the unloading plate 2, and the limiting top plate 21 is used to limit the upward sliding limit position of the unloading plate inclined sliding block 4, and to position the first unloading plate fixing block 5 and the second unloading plate fixing block 6 on the unloading plate 2. Fixed installation position.

[0041] The lower die part includes a lower die base 9, a die inclined sliding block 10, a die floating block 11, a lower ejector rod 12, a first die fixing block 13 and a second die fixing block 14.

[0042] The first die fixing block 13 is fixedly arranged on the lower die seat 9, and an inclined sliding surface 101 is arranged on the die oblique sliding block 10. The inclined sliding surface 101 of the die oblique sliding block 10 is slidably matched with the first die fixing block 13. Furthermore, a vertical limit portion 102 is also arranged at the bottom end of the inclined sliding surface 101 to ensure that the die oblique sliding block 10 will not deviate obliquely upward in the initial state; the lower ejector rod 12 is vertically slidably installed on the lower die seat 9, a spring is arranged at the bottom of the lower ejector rod 12 to provide an upward elastic force for the lower ejector rod 12, and a limit portion 121 is arranged at the bottom end of the lower ejector rod to limit the cutoff direction of the upward movement of the lower ejector rod 12, and the top of the lower ejector rod acts on the die oblique sliding block 10 through the spring; a negative angle bending direction facing the workpiece 8 is arranged on the die oblique sliding block 10 The extruded guide sliding surface 103 cooperates with the unloading plate inclined sliding block 4 to complete the negative angle bending adjustment of the workpiece 8 during mold operation; the die floating block 11 is slidably set on the lower die base 9, and a spring is set at the bottom of the die floating block 11. The spring provides an upward elastic force for the die floating block, and a limiting step 111 is also set at the bottom of the die floating block; the second die fixed block 14 is fixedly installed on the lower die base 9, and a limiting step 141 that cooperates with the limiting step 111 is set at the bottom to limit the upward distance of the die floating block 11, and an inclined surface 142 that cooperates with the bottom of the workpiece is set on the second die fixed block 14, which cooperates with the unloading plate inclined sliding block 4 and the first unloading plate fixed block 5 to prevent the inside of the workpiece 8 from deforming during the mold lowering process.

[0043] In this embodiment, a light load spring is used at the top of the first dome rod 3, and a medium load spring is used at the bottom of the lower dome rod 12 and the die buoyancy block 11 to ensure that the spring force of the die buoyancy block 11 is greater than that of the lower dome rod 12.

[0044] In this embodiment, the stroke of the stripper plate 2 is 29mm, the stroke of the die floating block 11 is 25mm, the stroke of the die inclined slider 10 is 8mm, the stroke of the stripper plate inclined slider 4 is 10mm, the angle of the die inclined slider 10 is 25°, and the angle of the stripper plate inclined slider 4 is 8°. The first stripper plate fixing block 13 and the second stripper plate fixing block 14 are fixed with reverse screws for easy quick release and adjustment.

[0045] The processing method of the present invention for adjusting the negative angle bending of a workpiece is as follows:

[0046] Step 1, refer to Figure 1 The progressive die starts to close from the open state, and the bottom of the workpiece 8 is supported by the die floating block 11. During the closing process, the upper die part moves downward, and the unloading plate inclined slider 4 begins to contact the right bottom surface of the part to be bent of the workpiece 8.

[0047] Step 2, refer to Figure 3 As the upper die part continues to move downward, the stripper plate inclined slide block 4 is subjected to the upward force of the workpiece 8. Since the spring force at the bottom of the die floating block 11 is greater than the spring force at the top of the first upper push rod 3, the spring at the top of the first upper push rod 3 is compressed, and the stripper plate inclined slide block 4 remains in position, while the upper die base 1 and the stripper plate 2 continue to move downward, so that the shaping protrusion 51 at the bottom of the first stripper plate fixing block 5 and the stripper plate inclined slide block 4 are embedded in the right inner position of the bending part of the workpiece 8 to form a sufficient fitting support.

[0048] Step 3, refer to Figure 4 As the upper die part continues to move downward, the stripper plate 2 moves downward to the bottom dead center position. At this time, the stripper plate 2 and the first stripper plate fixing block 5 and the stripper plate inclined slide block 4 thereon completely press the workpiece 8 onto the second die fixing block 14, completing the pressure positioning of the workpiece 8.

[0049] Step 4, refer to Figure 5 , the upper die seat 1 continues to move downward, and the upper die seat 1 drives the second upper ejector rod 7 to press down the die inclined slide block 10. During this process, the spring at the bottom of the lower ejector rod 12 at the bottom of the die inclined slide block 10 is compressed, so that the die inclined slide block 10 will move obliquely downward along the first die fixed block 13, and adjust the bending part of the workpiece to be bent, bending the 90-degree angle into a negative angle until the mold moves to a fully closed state; further, when the mold reaches a fully closed state, the upper die seat 1 will apply pressure to the stripper plate 2, so that the stripper plate 2 and the first stripper plate fixed block 5 and the stripper plate inclined slide block 4 thereon further pressurize and shape the workpiece 8, so that the workpiece can achieve higher precision.

[0050] For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right" and the like are used in the embodiments to illustrate the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "on" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0051] Furthermore, relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A processing method for adjusting a workpiece by a negative angle bend, characterized in that: It includes an upper mold part and a lower mold part; The upper die part includes an upper die seat, a stripper plate, a first upper ejector rod, a stripper plate inclined slide block, a first stripper plate fixing block, a second stripper plate fixing block and a second upper ejector rod; The unloading plate is slidably connected to the upper die seat through the first upper ejector rod and the second upper ejector rod, and the unloading plate oblique sliding block is slidably arranged on the unloading plate; the first upper ejector rod is vertically slidably installed in the unloading plate and the upper die seat, and an upper ejector rod limit block is arranged on the top of the first upper ejector rod to limit the cut-off direction of the downward movement of the first upper ejector rod, and a spring is also arranged on the top of the first upper ejector rod to provide a downward elastic force for the first upper ejector rod, so that the bottom of the first upper ejector rod acts on the unloading plate oblique sliding block; The first stripper plate fixing block and the second stripper plate fixing block are fixedly arranged on the stripper plate and slidably cooperate with the stripper plate inclined slider; the top end of the second upper ejector rod is fixedly installed on the upper die seat, and its rod body is slidably installed with the second stripper plate fixing block; A limit top plate is also fixedly installed on the top of the unloading plate, and the limit top plate is used to limit the upward sliding limit position of the unloading plate inclined sliding block, and to locate the first unloading plate fixing block and the second unloading plate fixing block on the unloading plate. Fixed installation position; The lower die part includes a lower die seat, a die oblique slide block, a die floating block, a lower ejector rod, a first die fixing block and a second die fixing block; The first die fixing block is fixedly arranged on the lower die seat, and the die oblique sliding block is slidably connected to the first die fixing block; the die oblique sliding block is provided with a guide sliding surface for extruding in the negative angle bending direction of the workpiece; the lower ejector rod is vertically slidably installed on the lower die seat, and a limit portion is also provided at the bottom end of the lower ejector rod to limit the upward cut-off direction of the lower ejector rod, and a spring is provided at the bottom of the lower ejector rod to provide an upward elastic force for the lower ejector rod, so that the top of the lower ejector rod acts on the die oblique sliding block; the die floating block is slidably arranged on the lower die seat, and a spring is provided at the bottom of the die floating block to provide an upward elastic force for the die floating block; the second die fixing block is fixedly arranged on the lower die seat, and is slidably connected to the die floating block; The working process is as follows: Step 1: The upper die and the lower die are closed, and the bottom of the workpiece is supported by the die lifting block. During the closing process, the upper die moves downward, and the inclined slider of the unloading plate begins to contact the right bottom surface of the part to be bent of the workpiece; Step 2: As the upper die part continues to move downward, the oblique slider of the stripper plate is subjected to the upward force of the workpiece. Since the spring force at the bottom of the die floating block is greater than the spring force at the top of the first upper ejector rod, the spring at the top of the first upper ejector rod is compressed, and the oblique slider of the stripper plate remains stationary, while the upper die seat and the stripper plate continue to move downward, so that the shaping protrusion at the bottom of the first stripper plate fixed block and the oblique slider of the stripper plate are embedded in the right inner position of the bending part of the workpiece to form a sufficient fit support; Step 3, as the upper die part continues to move downward, the stripper plate moves downward to the bottom dead center position. At this time, the stripper plate and the first stripper plate fixing block and the stripper plate inclined sliding block thereon completely press the workpiece onto the second die fixing block, completing the pressure positioning of the workpiece; Step 4: The upper die seat continues to move downward, and the upper die seat drives the second upper ejector rod to press down the die oblique slider. During this process, the spring at the bottom of the lower ejector rod at the bottom of the die oblique slider is compressed, causing the die oblique slider to move obliquely downward along the first die fixed block, and the workpiece to be bent is adjusted to bend from a 90-degree angle to a negative angle until the mold moves to a fully closed state.

2. The method for negative angle bending adjustment of a workpiece according to claim 1, characterized in that: When the mold reaches a fully closed state, the upper mold base applies pressure to the stripper plate, so that the stripper plate and the first stripper plate fixing block and the stripper plate inclined slide block thereon further press and shape the workpiece, so that the workpiece reaches a higher precision.

3. The method for negative angle bending adjustment of a workpiece according to claim 1, characterized in that: The stripper plate inclined sliding block is provided with an inclined surface which is slidably matched with the first stripper plate fixed block.

4. The method for negative angle bending adjustment of a workpiece according to claim 1, characterized in that: A downward shaping protrusion is provided at the bottom of the first stripper plate fixing block, and the shaping protrusion and the stripper plate inclined sliding block are used to ensure that the right inner position of the workpiece bending part is fully fitted and supported during the mold closing process.

5. The method for negative angle bending adjustment of a workpiece according to claim 1, characterized in that: A limit block is arranged at the bottom end of the second unloading plate fixed block, and is slidably matched with a limit block arranged at the top end of the unloading plate inclined sliding block.

6. The method for negative angle bending adjustment of a workpiece according to claim 1, characterized in that: An inclined sliding surface is arranged on one side of the inclined sliding block of the concave mold, and a limiting part of a vertical surface is also arranged at the bottom end of the inclined sliding surface.

7. The method for negative angle bending adjustment of a workpiece according to claim 1, characterized in that: A limiting step is arranged at the bottom end of the concave die floating block.

8. The method for negative angle bending adjustment of a workpiece according to claim 1, characterized in that: The bottom end of the second die fixing block is provided with a limiting step which cooperates with the limiting step of the die floating block to limit the upward distance of the die floating block. The second die fixing block is also provided with an inclined surface which cooperates with the bottom of the workpiece.

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