阅读说明：本技术 折弯机下模的加工方法 (Machining method for lower die of bending machine ) 是由 郑三豹 于 2020-05-14 设计创作，主要内容包括：本发明公开了一种折弯机下模的加工方法,先将原钢轧制成与折弯机下模模状相近的长条形毛坯,再在毛坯的一端割出用于与夹具相配合以夹持毛坯的夹持部,将毛坯的夹持部从模具的一端处伸入模具,采用夹具夹紧夹持部,使毛坯从模具经过由模具对毛坯冷挤压加工,待毛坯全部从模具内拉出后,测量冷挤压后毛坯的尺寸参数,再将毛坯从夹持部伸入模具,重复对其冷挤压处理多次,直至冷挤压后毛坯的尺寸参数符合设计要求成为折弯机下模,再对折弯机下模进行热处理得到成品折弯机下模。相较于现有技术采用锻打的方式制造折弯机下模,减少了加工的时间,提高了折弯机下模加工的效率,由于整个加工过程没有铣削和刨槽,不会产生铁屑,避免了切削液造成的污染。(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.)

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.

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.