CN111545587A - Machining method for lower die of bending machine - Google Patents
Machining method for lower die of bending machine Download PDFInfo
- Publication number
- CN111545587A CN111545587A CN202010406088.2A CN202010406088A CN111545587A CN 111545587 A CN111545587 A CN 111545587A CN 202010406088 A CN202010406088 A CN 202010406088A CN 111545587 A CN111545587 A CN 111545587A
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- China
- Prior art keywords
- blank
- bending machine
- lower die
- clamping part
- die
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/14—Making other products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/32—Lubrication of metal being extruded or of dies, or the like, e.g. physical state of lubricant, location where lubricant is applied
-
- 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
- B21D37/20—Making tools by operations not covered by a single other subclass
-
- 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
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention discloses a method for processing a lower die of a bending machine, which comprises the steps of rolling a raw steel into a strip blank with a shape similar to that of the lower die of the bending machine, cutting a clamping part for matching with a clamp to clamp the blank at one end of the blank, extending the clamping part of the blank into the mold from one end of the mold, clamping the clamping part by using the clamp, performing cold extrusion processing on the blank from the mold through the mold, measuring the size parameters of the blank after the cold extrusion after the blank is completely pulled out of the mold, extending the blank into the mold from the clamping part, repeating the cold extrusion processing for multiple times until the size parameters of the blank after the cold extrusion meet the design requirements to form the lower die of the bending machine, and performing heat treatment on the lower die of the bending machine to obtain a finished product lower die of the bending machine. Compared with the prior art that the bending machine lower die is manufactured in a forging mode, the processing time is shortened, the processing efficiency of the bending machine lower die is improved, no scrap iron is generated due to the fact that the whole processing process is free of milling and grooving, and pollution caused by cutting fluid is avoided.
Description
Technical Field
The invention relates to a machining method of a lower die of a bending machine, and belongs to the technical field of machining.
Background
The bender lower mould is important composition part on the bender, and it is used for supporting the steel sheet when bending the steel sheet to bending groove on the lower mould is used for cooperateing with last mould, is used for bending of steel sheet, and the procedure of bender lower mould is numerous and diverse, and its procedure is: the method comprises the steps of firstly forging raw steel, forging the raw steel into a blank, then milling the blank, milling the blank into a rectangular longitudinal section, finally planing a groove on the blank to manufacture a bending machine lower die, wherein the time required for forging the raw steel is long, generally 3-5 days, so that the processing period of the whole lower die bending machine is long, the improvement of the processing efficiency of the bending machine lower die is not facilitated, the time for the whole processing process is about 7 days, in addition, the milling and planing processing are required in the processing method, scrap iron and the like can be generated, and during the milling, cutting fluid also needs to be sprayed, and the pollution to a certain degree can be generated actually.
Disclosure of Invention
The invention aims to provide a method for processing a lower die of a bending machine, which solves the technical defect of long processing period of the lower die of the bending machine in the prior art.
In order to solve the problems, the technical scheme adopted by the invention is as follows: the method for processing the lower die of the bending machine comprises the steps of rolling a raw steel into a strip blank with a shape similar to that of the lower die of the bending machine, cutting a clamping part used for being matched with a clamp to clamp the blank at one end of the blank, extending the clamping part of the blank into the mold from one end of the mold, extending the clamping part from the other end of the mold, clamping the clamping part by using the clamp, pulling the clamping part to enable the blank to be subjected to cold extrusion processing on the blank from the mold through the mold, measuring the size parameters of the blank after the cold extrusion after the blank is completely pulled out of the mold, extending the blank into the mold from the clamping part, repeating the cold extrusion processing for multiple times until the size parameters of the blank after the cold extrusion meet the design requirements to form the lower die of the bending machine, and then carrying out heat treatment on the lower. Compared with the prior art, the forging, milling and grooving process is omitted, the time required by forging is shortened, the processing period is shortened on the whole, and the processing cost of the lower die of the bending machine is reduced.
As a further improvement of the invention, before the blank is subjected to cold extrusion, the surface of the blank is subjected to polishing treatment to smooth the surface of the blank. And oxide skin on the surface of the blank is removed by polishing, so that the surface of the blank is smooth, and when the blank is subjected to cold extrusion, the friction between the blank and a die is small, the resistance is small, and the drawing force on the blank is reduced.
As a further improvement of the invention, after the blank is polished, the surface of the blank is coated with a lubricant, and then the blank is subjected to cold extrusion treatment. The invention is coated with lubricant, no burr is generated on the blank in the cold pressing process, the surface quality of the prepared finished product is good, and the blank surface has no burr, so that the blank can not be damaged when being extruded again, the die is protected, and simultaneously, the drawing force is further reduced.
As a further improvement of the invention, the surface of the blank is coated with a lubricant before each cold extrusion of the blank. The whole cold extrusion process of the invention does not cause more damage to the die, thereby further protecting the die and further reducing the drawing force.
As a further improvement of the invention, after the clamping part is cut at one end of the blank, the clamping part is rolled to ensure that the surface of the clamping part is flat. The clamping part is flat, so that the clamping part is convenient to clamp during cold extrusion, and a blank is prevented from being loosened during extrusion.
As a further improvement of the invention, the longitudinal section of the clamping part after rolling is rectangular.
As a further improvement of the invention, the clamping part at one end of the blank is made by gas cutting. The clamping part is cut by gas, so that the cost is low and the operation is convenient.
As a further improvement of the invention, the lubricant is cold drawing oil. The blank is lubricated by cold drawing oil, so that the lubricating effect is good, the cost is low, the cost of machining the lower die of the bending machine is reduced on the whole, and the economic benefit is improved.
As a further improvement of the invention, the blank is annealed each time before it is extruded. The blank is annealed firstly, so that the blank is softened, the hardness of the blank is reduced, and the extrusion forming of the blank is more convenient.
In conclusion, the beneficial effects of the invention are as follows: compared with the prior art that the bending machine lower die is manufactured in a forging mode, the machining time is shortened, the machining efficiency of the bending machine lower die is improved, and no milling or grooving is adopted in the whole machining process, so that no scrap iron is generated, and pollution caused by cutting fluid is avoided.
Drawings
Fig. 1 is a front view of a mold employed in the invention.
Fig. 2 is a sectional view a-a of fig. 1.
Fig. 3 is a schematic perspective view of a mold used in the present invention.
Fig. 4 is an exploded perspective view of a mold used in the present invention.
FIG. 5 is a schematic view of a mold mounted on a frame for use in the reaction of the present invention.
Fig. 6 is a flow chart reflecting the steps of the present invention for machining the lower die of the bending machine.
Wherein: 1. a blank; 2. a clamping portion; 3. a mold; 4. die sleeve; 5. a mold core; 6. a fixing hole; 7. extruding the through hole; 8. a first fixing hole unit; 9. a second fixing hole unit; 10. a shoulder portion; 11. and a frame.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
Example 1:
as shown in fig. 6, the processing method of the lower die of the bending machine according to this embodiment includes the steps of: the raw steel is rolled into a strip-shaped blank 1 with the shape similar to that of the lower die of the bending machine, the rolling process is completed in a steel rolling mill, and the process of rolling the raw steel into the blank 1 is the prior art, so the invention is not detailed.
After the blank 1 is manufactured, a clamping part 2 which is used for being matched with a clamp to clamp the blank 1 is cut at one end of the blank 1, in the embodiment, the clamping part 2 at one end of the blank 1 is formed by gas cutting, and the gas cutting is in the prior art.
After cutting the clamping part 2, the clamping part 2 of the blank 1 is extended into the die 3 from one end of the die 3, the clamping part 2 is extended out from the other end of the die 3, the clamping part 2 is clamped by a clamp (the prior art), the clamping part 2 is pulled, the blank 1 is subjected to cold extrusion processing on the blank 1 from the die 3 by the die 3, and after the blank 1 is completely pulled out from the die 3, a measuring tool is used for measuring the size parameters of the blank 1 after the cold extrusion, such as the thickness and the width of the blank 1 after the extrusion, and the width and the depth of the upper groove of the blank 1.
Comparing the size parameter of the blank 1 measured after the cold extrusion with the size parameter of the lower die of the bending machine, then extending the blank 1 into the die 3 from the clamping part 2, and repeating the cold extrusion treatment on the blank 1 for a plurality of times until the size parameter of the blank 1 after the cold extrusion meets the design requirement to form the lower die of the bending machine. In this example, the blank is annealed before each extrusion of the blank 1.
And after the cold extrusion of the lower die of the bending machine is finished, carrying out heat treatment on the lower die of the bending machine to obtain a finished bending machine lower die.
As shown in fig. 1 to 4, the die adopted by the present invention includes a die sleeve 4 and a die core 5, the die sleeve 4 is detachably mounted on a frame 11, the die sleeve 4 is provided with fixing holes 6 penetrating through both ends thereof along a length direction thereof, the die core 5 is mounted in the fixing holes 6, the die core 5 is provided with extrusion through holes 7 penetrating through both ends thereof along a length direction thereof, a cross-sectional shape of the extrusion through holes 7 is the same as a cross-sectional shape of a lower die of a bending machine, the extrusion through holes 7 are used for a blank 1 to pass through and to be matched with the blank 1 to extrude the blank 1 into the lower die of the bending machine, and the extrusion through holes 7 in the present invention have a structure with one large end and one small end in a taper. The taper of the extrusion through hole 7 is 8-12 degrees, and the taper of the extrusion through hole 7 is preferably 10 degrees.
The outer surface of the mold core 5 is a cylindrical surface, the fixing hole 6 comprises a first fixing hole unit 8 and a second fixing hole unit 9, the center lines of which are coincident, wherein the diameter of the first fixing hole unit 8 is larger than that of the second fixing hole unit 9, a shoulder 10 is formed at the joint of the first fixing hole unit 8 and the second fixing hole unit 9, the mold core 5 is positioned in the first fixing hole unit 8, the end part of the mold core 5 is abutted against the shoulder 10, namely, the end part of the mold core 5 is abutted against the shoulder 10 and is blocked by the shoulder 10, so that the mold core 5 is prevented from moving towards the second through hole unit 9 in the use process, and the opening of the extrusion through hole 7 at one end close to the second fixing hole unit 9 is larger than that at one end far away from the second fixing hole unit 9. The length of the mold core 5 is preferably set to be equal to the depth of the first fixing hole unit 8, so that the end surface of the mold core 5 far away from the second fixing hole unit 8 is coplanar with the end surface of the mold sleeve 4.
In the invention, the outer diameter of the die sleeve 4 at one end of the second fixing hole unit 9 is smaller than the outer diameter of the die sleeve 4 at one end of the first fixing hole unit 8, so that the die sleeve 4 is in a circular truncated cone shape as a whole, a rack for mounting the die sleeve 4 is provided with a horn-shaped mounting through hole (not shown in the figure) with a large end and a small end, and the die sleeve 4 is mounted in the mounting through hole and matched with the mounting through hole, as shown in fig. 5.
Example 2:
compared with the embodiment 1, in the embodiment, before the blank 1 is subjected to cold extrusion, the surface of the blank 1 is polished to remove impurities such as oxide scales on the surface of a workpiece, so that the surface of the blank 1 is smooth, and the resistance between the blank 1 and a die 3 when the blank 1 passes through the die 3 is reduced; the remaining steps in this embodiment are the same as those in embodiment 1, and reference may be made to embodiment 1 for details, which are not repeated herein.
Example 3:
this embodiment is a further improvement on the basis of embodiment 2, and compared with embodiment 2, in this embodiment, after polishing the blank 1, the surface of the blank 1 is coated with a lubricant, and then the blank 1 is subjected to cold extrusion treatment. The lubricant described in this embodiment is preferably cold drawing oil. Because the blank 1 may need to be cold-extruded for multiple times to be made into the lower die of the bending machine, in order to reduce the resistance between the blank and the die 3 during cold extrusion, in this embodiment, before cold extrusion of the blank 1 each time, the surface of the blank 1 is coated with a lubricant. The remaining steps in this embodiment are the same as those in embodiment 2, and reference may be made to embodiment 2 for details, which are not repeated herein.
Example 4:
the present embodiment is a further improvement on the basis of embodiment 1, 2 or 3, and compared with the foregoing embodiments, in the present embodiment, after the clamping portion 2 is cut at one end of the blank 1, the clamping portion 2 is rolled first to flatten the surface of the clamping portion 2, and then the blank 1 is subjected to cold extrusion to facilitate clamping and fixing of the clamping portion 2. The clamping portion 2 in the present embodiment is rolled to have a rectangular longitudinal section, but the clamping portion is preferably rolled to have a square longitudinal section in the present invention. The remaining steps in this embodiment are the same as those in embodiment 1, 2 or 3, and reference may be made to the foregoing embodiment for details, which are not repeated herein.
The parts which are not specifically described in the above description are the prior art, or can be realized by the prior art. The specific embodiments of the present invention are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention. That is, all equivalent changes and modifications made according to the content of the claims of the present invention should be regarded as the technical scope of the present invention.
Claims (9)
1. The machining method of the lower die of the bending machine is characterized by comprising the following steps: firstly, rolling original steel into a strip-shaped blank (1) with a shape similar to that of a lower die of a bending machine, cutting one end of the blank (1) into a clamping part (2) which is matched with a clamp to clamp the blank (1), extending the clamping part (2) of the blank (1) into the die (3) from one end of the die (3) and extending out from the other end of the die (3), clamping the clamping part (2) by using the clamp, pulling the clamping part (2) to enable the blank (1) to be subjected to cold extrusion processing on the blank (1) by the die (3) from the die (3), measuring the size parameter of the blank (1) after cold extrusion after the blank (1) is completely pulled out of the die (3), extending the blank (1) into the die (3) from the clamping part (2), repeatedly performing cold extrusion processing on the blank for a plurality of times until the size parameter of the blank (1) after cold extrusion meets the design requirement to form the lower die of the bending machine, and then carrying out heat treatment on the lower die of the bending machine to obtain the finished bending machine lower die.
2. The machining method of the lower die of the bending machine according to claim 1, characterized by comprising the following steps of: before the blank (1) is subjected to cold extrusion, the surface of the blank (1) is polished to smooth the surface of the blank (1).
3. The machining method of the lower die of the bending machine according to claim 2, characterized by comprising the following steps of: polishing the blank (1), coating a lubricant on the surface of the blank (1), and then performing cold extrusion treatment on the blank (1).
4. The machining method of the lower die of the bending machine according to claim 3, characterized by comprising the following steps of: before each cold extrusion of the blank (1), the surface of the blank (1) is coated with a lubricant.
5. The machining method of the lower die of the bending machine according to claim 1, characterized by comprising the following steps of: after the clamping part (2) is cut at one end of the blank (1), the clamping part (2) is rolled, so that the surface of the clamping part (2) is flat.
6. The machining method of the lower die of the bending machine according to claim 5, characterized by comprising the following steps of: the longitudinal section of the clamping part (2) is rectangular after rolling.
7. The machining method of the lower die of the bending machine according to claim 1, characterized by comprising the following steps of: the clamping part (2) at one end of the blank (1) is made by gas cutting.
8. The machining method of the lower die of the bending machine according to claim 3 or 4, characterized by comprising the following steps of: the lubricant is cold drawing oil.
9. The machining method of the lower die of the bending machine according to any one of claims 1 to 7, characterized by comprising the following steps: annealing the blank (1) before each extrusion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010406088.2A CN111545587A (en) | 2020-05-14 | 2020-05-14 | Machining method for lower die of bending machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010406088.2A CN111545587A (en) | 2020-05-14 | 2020-05-14 | Machining method for lower die of bending machine |
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| Publication Number | Publication Date |
|---|---|
| CN111545587A true CN111545587A (en) | 2020-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010406088.2A Pending CN111545587A (en) | 2020-05-14 | 2020-05-14 | Machining method for lower die of bending machine |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11314112A (en) * | 1997-10-14 | 1999-11-16 | General Electric Co <Ge> | Wire drawing die having non-cylindrical boundary shape for reducing stress |
| CN101259489A (en) * | 2007-03-09 | 2008-09-10 | 周锡轩 | Flowering branch drawing method and mold component for stainless steel handle and press |
| CN102189379A (en) * | 2011-04-13 | 2011-09-21 | 张家港保税区恒隆钢管有限公司 | Cold drawing method and die for special-shaped pipes |
| CN106269938A (en) * | 2016-08-31 | 2017-01-04 | 湖北加恒实业有限公司 | A kind of processing method of cold-drawn piston rod |
| CN106624677A (en) * | 2016-12-07 | 2017-05-10 | 新昌县东韩机械有限公司 | Extruding technology and mode in die manufacturing process |
| CN107214208A (en) * | 2017-07-01 | 2017-09-29 | 浙江义腾特种钢管有限公司 | A kind of production technology of sanitation-grade stainless steel tube |
| CN107363488A (en) * | 2017-07-20 | 2017-11-21 | 苏州市天星山精密模具有限公司 | A kind of processing technology of high abrasion mould |
-
2020
- 2020-05-14 CN CN202010406088.2A patent/CN111545587A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11314112A (en) * | 1997-10-14 | 1999-11-16 | General Electric Co <Ge> | Wire drawing die having non-cylindrical boundary shape for reducing stress |
| CN101259489A (en) * | 2007-03-09 | 2008-09-10 | 周锡轩 | Flowering branch drawing method and mold component for stainless steel handle and press |
| CN102189379A (en) * | 2011-04-13 | 2011-09-21 | 张家港保税区恒隆钢管有限公司 | Cold drawing method and die for special-shaped pipes |
| CN106269938A (en) * | 2016-08-31 | 2017-01-04 | 湖北加恒实业有限公司 | A kind of processing method of cold-drawn piston rod |
| CN106624677A (en) * | 2016-12-07 | 2017-05-10 | 新昌县东韩机械有限公司 | Extruding technology and mode in die manufacturing process |
| CN107214208A (en) * | 2017-07-01 | 2017-09-29 | 浙江义腾特种钢管有限公司 | A kind of production technology of sanitation-grade stainless steel tube |
| CN107363488A (en) * | 2017-07-20 | 2017-11-21 | 苏州市天星山精密模具有限公司 | A kind of processing technology of high abrasion mould |
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Application publication date: 20200818 |
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