CN114523031A - Cutting part burr-free processing technology and product thereof - Google Patents
Cutting part burr-free processing technology and product thereof Download PDFInfo
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- CN114523031A CN114523031A CN202210026714.4A CN202210026714A CN114523031A CN 114523031 A CN114523031 A CN 114523031A CN 202210026714 A CN202210026714 A CN 202210026714A CN 114523031 A CN114523031 A CN 114523031A
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- 238000005520 cutting process Methods 0.000 title claims abstract description 69
- 238000005516 engineering process Methods 0.000 title claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 250
- 238000004080 punching Methods 0.000 claims abstract description 46
- 238000009826 distribution Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 27
- 230000008569 process Effects 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 18
- 238000003754 machining Methods 0.000 claims description 10
- 238000000926 separation method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 10
- 230000005489 elastic deformation Effects 0.000 description 6
- 230000000750 progressive effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000001360 synchronised effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 238000004140 cleaning Methods 0.000 description 1
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- 238000009499 grossing Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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- 238000009966 trimming Methods 0.000 description 1
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- 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
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/16—Shoulder or burr prevention, e.g. fine-blanking
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- 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
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/14—Dies
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- 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
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention discloses a cutting part burr-free processing technology, which comprises the following steps: the sheet metal part comprises a first sheet metal part and a second sheet metal part which are integrated; the second metal plate part is punched upwards at least 2 times, and the clearance of the second punching is larger than that of the first punching; and the two parts after blanking are kept not to be separated; and then, downwards punching the second metal plate part for at least 2 times, wherein the clearance of the second punching is smaller than that of the first punching, so that the first metal plate part and the second metal plate part are separated. And processing according to the processing technology to obtain a sheet metal part product without burrs at the final cutting part, wherein the cutting cross section of the sheet metal part product sequentially forms the distribution of a collapsed angle, a cutting surface, a fracture surface, a cutting surface and a collapsed angle from top to bottom. The invention can realize the burr-free processing of the final cut part of the product in the continuous die without adding a separate chamfer deburring engineering die, thereby saving the processing cost and improving the product quality and the production efficiency.
Description
Technical Field
The invention belongs to the technical field of sheet metal machining, and relates to a burr-free machining process and a burr-free sheet metal part.
Background
The progressive die is a cold stamping die which adopts a strip-shaped stamping raw material in the forming stamping stroke of a press machine and simultaneously completes a plurality of stamping processes on a pair of dies by using a plurality of different stations, and the strip material moves once at a fixed distance every time the dies complete stamping until the product is completed; after finishing the processes of trimming, punching, deep drawing, bending and the like in the continuous die, the sheet metal part is finally separated into a product and a waste material.
Chamfering refers to machining the corners of a workpiece into a certain inclined plane. The chamfering is to remove burrs generated by machining on the parts, and is also to facilitate the assembly of the parts, the end portions of the parts are generally chamfered.
In the prior art, as shown in fig. 1, the cross section of the final cut part of a finished product processed on a progressive die forms a corner collapse, a cut surface, a fracture surface and distribution of burrs, and the burrs need to be chamfered and removed, so that a separate chamfer deburring engineering die needs to be added for corresponding product processing, the cost of process treatment is increased, and the product processing efficiency is influenced.
Disclosure of Invention
Aiming at the problem that burrs are generated at the final cut part in the continuous die machining of the sheet metal part in the prior art and a deburring engineering die needs to be added independently, the invention provides a burr-free machining process for the cut part, and an independent chamfering and deburring engineering die does not need to be added, so that the machining cost is saved, and the product quality and the production efficiency are improved. And correspondingly provides a sheet metal part product with a final cutting part without burrs.
The technical scheme provided by the invention is as follows:
a cutting part burr-free processing technology comprises the following steps:
the sheet metal part comprises a first sheet metal part and a second sheet metal part which are integrated; the second metal plate part is punched upwards at least 2 times, and the clearance of the second punching is larger than that of the first punching; and keeping the two parts after blanking from separating;
and then, downwards punching the second metal plate part for at least 2 times, wherein the clearance of the second punching is smaller than that of the first punching, so that the first metal plate part and the second metal plate part are separated.
Preferably, in the upward blanking, the depth of the second blanking is greater than that of the first blanking, and the depth of the upward blanking is 50% of the total material thickness;
in the downward blanking, the depth of the second blanking is smaller than that of the first blanking.
Preferably, the upward blanking and the downward blanking of the second sheet metal part are respectively set to 2 times;
the first upward blanking gap is 8% of the thickness of the sheet metal part, and the second upward blanking gap is 10% of the thickness of the sheet metal part;
the first downward blanking gap is 10% of the thickness of the sheet metal part, and the second downward blanking gap is 8% of the thickness of the sheet metal part.
Further, the depth of the first upward blanking is 10% of the thickness of the sheet metal part, and the depth of the second upward blanking is 40% of the thickness of the sheet metal part;
the depth of the first downward blanking is 30-40% of the thickness of the sheet metal part, and the depth of the second downward blanking is 10-20% of the thickness of the sheet metal part.
Preferably, S1, performing the first engineering on the sheet metal part, wherein the sheet metal part comprises a first sheet metal part and a second sheet metal part; the first engineering is to punch a second sheet metal part upwards at a certain punching gap, the cross section of the sheet metal part is mainly subjected to shear stress and generates elastic strain, the lower surface of the first sheet metal part forms an upward collapsed angle, the upper surface is torn, and no burr or slight burr is generated;
s2, performing a second engineering on the second sheet metal part, and adjusting a blanking gap, wherein the second engineering is to blank the second sheet metal part upwards, the cross section of the sheet metal part is mainly subjected to shear stress to generate plastic strain, so that the sheet metal part generates a lower cutting surface, and in the second engineering, the first sheet metal part and the second sheet metal part are kept sheared and not separated;
s3, performing a third engineering on the second sheet metal part, and keeping a blanking gap of the second engineering, wherein the third engineering is to blank the second sheet metal part downwards, and the cross section of the sheet metal part is mainly subjected to shear stress to generate plastic strain, so that an upper cutting surface is generated on the cross section of the first sheet metal part;
s4, performing an IV (fourth) engineering on the second sheet metal part, and adjusting a blanking gap, wherein the IV engineering is to blank the second sheet metal part downwards, the cross section of the sheet metal part is mainly subjected to shear stress to generate elastic strain, and a fracture surface is generated in the middle of the sheet metal part to separate the first sheet metal part from the second sheet metal part, so as to complete fracture separation; in the IV engineering, blanking and cutting are finished by using a cutting punch, and burrs on the upper surface of the first metal plate part are removed by chamfering, so that the upper surface generates a downward collapsed angle;
wherein, the blanking clearance of the first engineering is controlled to be smaller than that of the second engineering;
and controlling the blanking clearance of the IV engineering to be smaller than that of the III engineering.
Further, the cutting punch used in step S4 has an R angle of R0.4 and a blanking draft of 105 °.
Further, in step S1, the upward punching depth of the second sheet metal part is 10% of the thickness of the sheet metal part;
in step S2, the upward punching depth of the second sheet metal part is 40% of the thickness of the sheet metal part;
in the step S3, the downward blanking depth of the second sheet metal part is 30-40% of the thickness of the sheet metal part;
in step S4, the downward punching depth of the second sheet metal part is 10-20% of the thickness of the sheet metal part.
Further, in step S1, the upward blanking gap of the second sheet metal part is 8% of the thickness of the sheet metal part;
in the step S2, the upward blanking gap of the second sheet metal part is 10% of the thickness of the sheet metal part;
in the step S3, the downward blanking gap of the second sheet metal part is 10% of the thickness of the sheet metal part;
in step S4, the blanking gap of the second sheet metal part is 8% of the thickness of the sheet metal part.
The invention also can provide a cutting part burr-free sheet metal part product which is processed according to the burr-free processing technology.
Preferably, the machined cut-off portion burr-free sheet metal part product has a distribution of a shear drop, a cut surface, a fracture surface, a cut surface, and a shear drop in the order of a cut cross section of a final cut-off portion.
Compared with the prior art, due to the working principle of the existing stamping and blanking processing, the sheet metal cutting surface can form a corner collapse, a cutting surface, a fracture surface and burr distribution from top to bottom, and under the condition that burrs need to be removed from the final cutting part of the sheet metal processed on a continuous die, a separate chamfer deburring engineering die needs to be added for correspondence, and the invention has the beneficial effects that:
1) according to the invention, the distribution of the collapse angle, the cut surface, the broken surface, the cut surface and the collapse angle of the cross section of the metal plate from top to bottom is realized through a half-drawing blanking process, so that no burr is generated on a cut product accurately.
2) The invention performs upward blanking and downward blanking in stages, controls proper process conditions, effectively ensures that the first upward blanking/the second downward blanking performs proper elastic deformation to form uniform collapse angles, performs proper plastic deformation for the second upward blanking/the first downward blanking to generate a regular cutting part, and designs a special cutting punch.
Drawings
FIG. 1 is a sectional view of a final cut portion in a sheet metal process according to the prior art.
FIG. 2 is a diagram of a continuous mold process of the present invention.
FIG. 3 is a process flow diagram of the present invention.
Fig. 4 is a schematic structural view of the cutting punch of the present invention.
Fig. 5 and 6 are sectional views of the cut part of the sheet metal part treated by the process of the invention.
The notations in the figures have the following meanings:
a, corner collapse, b, a cut surface, c, a fracture surface and d, burrs;
1-a first sheet metal part, 2-a second sheet metal part, 3-an upward collapsed angle, 4-a downward cut section, 5-an upward cut section, 6-a broken section, 7-a downward collapsed angle, and 8-a cutting punch.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the specific embodiments. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
According to the burr-free machining process provided by the invention, as shown in the combined drawings 2 and 3, the steps of machining the sheet metal part are as follows: the sheet metal part comprises a first sheet metal part 1 and a second sheet metal part 2 which are integrated; the second metal plate part 2 is punched upwards for at least 2 times, and the clearance of the second punching is larger than that of the first punching; and keeping the two parts after blanking from separating; and then, downwards punching the second metal plate part 2 for at least 2 times, wherein the clearance of the second punching is smaller than that of the first punching, so that the first metal plate part 1 and the second metal plate part 2 are separated.
According to the embodiment, in the upward blanking, the first blanking gap is small, so that the cross section of a knife edge formed on the sheet metal part is mainly subjected to shear stress, and elastic deformation is sent to form an upward collapse angle 3; the cross section of the sheet metal part is mainly subjected to shear stress and generates elastic strain, the lower surface of the first sheet metal forms an upward collapse angle 3, and the upper surface is torn, so that burrs are not generated or slight generation is generated (shown in a combined mode in fig. 5 or fig. 6); subsequent blanking gaps are increased greatly, so that the cross section of the sheet metal is mainly subjected to shear stress to generate plastic strain, and the sheet metal part generates a cut surface; the burrs can be reduced to the maximum extent by matching; meanwhile, the great abrasion of a punch for blanking is reduced to the maximum extent. In the same way, in the downward blanking process, the gradient change of the blanking gap is controlled, a larger blanking gap is firstly applied to promote the generation of plastic strain, so that the upper cutting surface is generated on the cross section of the metal plate; and a smaller blanking gap is applied, the cross section of the sheet metal is mainly subjected to shear stress, elastic strain is generated in the sheet metal part, a fracture surface is generated, the first sheet metal part is separated from the second sheet metal part, and burrs can be prevented from being generated on the upper surface of the sheet metal part to the maximum extent. And moreover, the punching is carried out upwards firstly, and then the punching is carried out downwards, so that the condition that even a small amount of burrs are generated, the burrs are also generated on the upper surface of a product in the continuous die is ensured, the synchronous processing in the continuous die is convenient, and the cross section with the uniform and regular surface is formed.
Preferably, in the upward blanking, the depth of the second blanking is greater than that of the first blanking, and the depth of the upward blanking is 50% of the total material thickness; in the downward blanking, the depth of the second blanking is smaller than that of the first blanking.
Through upward multistage blanking, the first-stage blanking depth is small by combining the embodiment, so that the cross section of a knife edge formed on the sheet metal part is subjected to shear stress, elastic deformation is sent, a regular and smooth upward collapsed angle 3 with a regular surface is formed, the upper surface is torn simultaneously, and basically no burrs or few burrs are generated; after the subsequent deep blanking treatment, the cross section of the knife edge is subjected to cutting stress and generates proper plastic deformation, so that a lower cutting section 4 with a regular and smooth surface is formed; and then, downward multistage blanking is also beneficial to the fact that the cross section of a blade which is blanked step by step is subjected to appropriate plastic deformation under the action of shearing stress, an upper cutting face 5 with a regular and smooth surface is generated, and the blanking depth is further reduced to generate elastic deformation, so that a fracture face 6 is formed. Therefore, the final cut cross section of the metal plate generates the distribution of the corner collapse, the cut surface, the broken surface, the cut surface and the corner collapse, and the final cut part processed by the metal plate continuous die has no burrs. Thus, the half-drawing blanking process for punching the blank upward by half can promote the formation of the corner collapse and the cut surface, and can further avoid the generation of burrs.
In order to further avoid the generation of burrs and obtain a relatively ideal cross-sectional structure, the upward punching and the downward punching of the second sheet metal part are respectively set to 2 times, which is shown in fig. 2;
the first upward blanking gap is 8% of the thickness of the sheet metal part, and the second upward blanking gap is 10% of the thickness of the sheet metal part;
the first downward blanking gap is 10% of the thickness of the sheet metal part, and the second downward blanking gap is 8% of the thickness of the sheet metal part;
further, the depth of the first upward blanking is 10% of the thickness of the sheet metal part, and the depth of the second upward blanking is 40% of the thickness of the sheet metal part;
the depth of the first downward blanking is 30-40% of the thickness of the sheet metal part, and the depth of the second downward blanking is 10-20% of the thickness of the sheet metal part.
Thus, the first upward blanking can control the blade cross section to form a smooth and regular upward collapse angle 3, and the upper surface is torn, without burr or slight generation. The depth of the second upward blanking is 40% of the thickness of the sheet metal part; controlling the plastic deformation range to form an undercut surface 4 with a smooth and regular lower surface;
the first downward blanking controls the plastic deformation range, so that the cross section of the sheet metal part forms an upper cutting surface 5 with smooth and regular surface. And controlling the elastic strain range by blanking downwards for the second time, and producing an upper fracture surface 6 at the middle position to separate the first metal plate part 1 from the second metal plate part 2.
According to another embodiment of the present invention, shown in fig. 2 and 3, a burr-free processing process is formed by the following steps:
s1, performing the first engineering on the sheet metal part, wherein the sheet metal part comprises a first sheet metal part 1 and a second sheet metal part 2; the first engineering is that the second sheet metal part 2 is punched upwards at a certain punching clearance, the cross section of the sheet metal part is mainly subjected to shear stress and generates elastic strain, an upward collapsed angle 3 is formed on the lower surface of the first sheet metal part 1, the upper surface is torn, and no burr or slight burr is generated;
s2, performing a second engineering on the second sheet metal part 2, and adjusting a blanking gap, wherein the second engineering is to blank the second sheet metal part 2 upwards, the cross section of the sheet metal part is mainly subjected to shear stress to generate plastic strain, so that the sheet metal part generates a lower cutting surface 4, and in the second engineering, the first sheet metal part 1 and the second sheet metal part 2 are kept to be sheared and not separated;
wherein, the blanking clearance of the first engineering is controlled to be smaller than that of the second engineering;
s3, performing a third engineering on the second sheet metal part 2 to keep a blanking gap of the second engineering, wherein the third engineering is to downwards blank the second sheet metal part 2, and the cross section of the sheet metal part is mainly subjected to shear stress to generate plastic strain, so that an upper cutting face 5 is generated on the cross section of the first sheet metal part 1;
s4, performing an IV (fourth) engineering on the second sheet metal part 2, and adjusting a blanking gap, wherein the IV engineering is to blank the second sheet metal part 2 downwards, the cross section of the sheet metal part is mainly subjected to shear stress to generate elastic strain, and a fracture surface is generated in the middle of the sheet metal part, so that the first sheet metal part 1 is separated from the second sheet metal part 2, and the fracture separation is completed; as shown in fig. 5 to 6, the fourth step is to perform blanking and cutting by using a cutting punch 8 shown in fig. 4, and to chamfer and deburr the upper surface burrs of the first sheet metal part, so that a downward collapse 7 is generated on the upper surface.
According to the embodiment, the distribution of the upward collapsed angle 3 or slight burr, the downward cut section 4 (no burr), the broken section 6, the upward cut section 5 (no burr) and the downward collapsed angle 7 (no burr) is generated on the final cut cross section of the sheet metal, even if slight burr is generated on the upper surface of the sheet metal part, the chamfer deburring process can be completed by the cutting punch at the same time of punching and separating, so that no burr is generated on the final cut part of the sheet metal progressive die, the working procedures are saved, and the product quality and the processing efficiency are improved.
In a preferred embodiment, the cutting punch used in step S4 has an R angle of R0.4 (i.e., a chamfer radius of 0.4mm) and a blanking draft of 105 °. Therefore, when the blanking and cutting process is completed by the cutting punch, the upper surface burrs of the first metal plate part can be subjected to chamfering and deburring synchronously, so that the upper surface of the first metal plate part generates uniform and regular downward collapse angles 7, and corresponding dies do not need to be additionally and independently added, so that the processing efficiency is improved, and the cost is saved.
In the above embodiment, in order to promote a regular form of the final cut cross section of the sheet metal part, the following is controlled:
in step S1, the upward blanking gap of the second sheet metal part is 8% of the thickness of the sheet metal part;
in the step S2, the upward blanking gap of the second sheet metal part is 10% of the thickness of the sheet metal part;
in the step S3, the downward blanking gap of the second sheet metal part is 10% of the thickness of the sheet metal part;
in step S4, the blanking gap of the second sheet metal part is 8% of the thickness of the sheet metal part.
In the step S1, the upward punching depth of the second sheet metal part is 10% of the thickness of the sheet metal part;
in step S2, the upward punching depth of the second sheet metal part is 40% of the thickness of the sheet metal part;
in step S3, the downward punching depth of the second sheet metal part is 30-40% of the thickness of the sheet metal part;
in step S4, the downward punching depth of the second sheet metal part is 10-20% of the thickness of the sheet metal part.
Therefore, the first sheet metal part 1 is separated from the second sheet metal part 2, no burrs are generated on the upper surface and the lower surface of the separated sheet metal part, and no additional process treatment is needed.
Example 1
S1, performing the first engineering on the sheet metal part, wherein the sheet metal part comprises a first sheet metal part 1 and a second sheet metal part 2; the first engineering is that a conventional half-cutting punch is utilized to upwards punch a second sheet metal part 2, the punching gap is 8% of the material thickness, the punching depth is 10% of the material thickness, the cross section of a sheet metal part is mainly subjected to shear stress and generates elastic deformation, so that an upward collapsed angle 3 is formed on the lower surface of the sheet metal part, the upper surface is torn, and burrs are not generated or slight generation is generated;
s2, performing a second project on the second sheet metal part 2, wherein the second project is to utilize a half-cutting punch to punch the second sheet metal part 2 upwards, the punching gap is 10% of the material thickness, the punching depth is 40% of the material thickness, the cross section of the sheet metal part is mainly subjected to the cutting stress, and the sheet metal part is subjected to plastic deformation to generate a lower cutting surface 4; in the second engineering, the blanking of the first metal plate part 1 and the blanking of the second metal plate part 2 are kept not to be separated;
s3, performing a third engineering on the second metal plate part 2, wherein the third engineering is to utilize a conventional blanking punch to downwards blank the second metal plate part, the blanking gap is 10% of the material thickness, and the blanking depth is 10% of the material thickness, so that the first metal plate part 3 is mainly subjected to the cutting stress and is subjected to plastic deformation to generate an upper cutting surface 5;
s4, performing an IV (fourth) process on the second metal plate part, wherein the IV process is to utilize a cutting punch to punch the second metal plate part 2 downwards, the punching gap is 8% of the material thickness, the punching depth is 40% of the material thickness, so that the cross section of the first metal plate part 1 is mainly subjected to shear stress and generates elastic deformation to generate a fracture surface 6, and the first metal plate part 1 is separated from the second metal plate part 2; and in the IV engineering, after the cutting is finished by using the cutting punch 8, chamfering and deburring are carried out on burrs on the upper surface of the first metal plate part, so that a downward collapsed angle 7 is generated on the upper surface of the first metal plate part.
The final transverse section of the burr-free sheet metal part product at the cutting part is as shown in fig. 3, and the distribution of the corner collapse, the cutting surface, the fracture surface, the cutting surface and the corner collapse is formed, so that no burr is generated.
Example 2
This embodiment is substantially the same as embodiment 1 except that:
in step S3, the blanking depth is 35% of the material thickness;
in step S4, the blanking depth is 15% of the thickness of the blank.
The cross section of the final burr-free sheet metal part product at the cutting part is basically as shown in fig. 3, and the distribution of the collapsed angle, the cutting surface, the broken surface, the cutting surface and the collapsed angle is formed, so that no burr is generated.
Example 3
This embodiment is substantially the same as embodiment 1 except that:
in step S3, the blanking depth is 30% of the material thickness;
in step S4, the blanking depth is 20% of the thickness of the blank.
The cross section of the final burr-free sheet metal part product at the cutting part is basically as shown in fig. 3, and the distribution of the collapsed angle, the cutting surface, the broken surface, the cutting surface and the collapsed angle is formed, so that no burr is generated.
Comparative example 1
In step S1, the blanking depth is 25% of the material thickness;
in step S2, the blanking depth is 40% of the material thickness;
in step S3, the blanking depth is 20% of the material thickness;
in step S4, the blanking depth is 15% of the thickness of the blank.
Comparative example 2
In step S3, the blanking depth is 20% of the material thickness;
in step S4, the blanking depth is 30% of the thickness of the blank.
Comparative example 3
In step S4, the blanking gap is 10% of the thickness of the blank.
Comparative example 4
In step S1, the blanking gap is 10% of the thickness of the blank.
The results prepared according to the procedures of the above examples illustrate:
in comparative example 1, the upward cutting depth is too large, which affects the area of the cut surface and the broken surface, and also causes burrs to be generated, so that the cut cross section has irregular shape and uneven transition.
In comparative example 4, since the first upward blanking gap was large, the upper surface of the sheet metal part was excessively burred, and it was difficult to handle the subsequent process through the iv step in step S4.
In comparative example 1 and comparative example 2, since the blanking depth of steps S1 and S4 exceeded a certain range, burrs are easily generated, and in comparative example 3 and comparative example 4, the blanking gap of steps S1 and S4 exceeded a certain range, the burrs are increased, and it is difficult to achieve the effect of surface smoothing by the step S4 of simultaneous cleaning.
According to the invention, through controlling the blanking gaps and the blanking depths of the steps S1, S2, S3 and S4, even if a small amount of burrs are generated on the upper surface of the sheet metal part in the step S1, the synchronous chamfering and deburring treatment can be realized through the step S4 of the continuous die process, and the excessive smoothness and regularity among the collapsed surface, the cut surface, the fracture surface, the cut surface and the collapsed surface can be effectively ensured on the whole.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A cutting part burr-free processing technology is characterized by comprising the following steps:
the sheet metal part comprises a first sheet metal part and a second sheet metal part which are integrated; the second metal plate part is punched upwards for at least 2 times, and the clearance of the second punching is larger than that of the first punching; and keeping the two parts after blanking from separating;
and then, downwards punching the second metal plate part for at least 2 times, wherein the clearance of the second punching is smaller than that of the first punching, so that the first metal plate part and the second metal plate part are separated.
2. The cutting portion burr-free processing process according to claim 1, characterized in that:
in the upward blanking, the depth of the second blanking is greater than that of the first blanking, and the upward blanking depth is 50% of the total material thickness;
in the downward blanking, the depth of the second blanking is smaller than that of the first blanking.
3. The cut-off portion burr-free processing process according to claim 1 or 2, characterized in that:
the upward blanking and the downward blanking of the second metal plate part are respectively set to be 2 times;
the first upward blanking gap is 8% of the thickness of the sheet metal part, and the second upward blanking gap is 10% of the thickness of the sheet metal part;
the first downward blanking gap is 10% of the thickness of the sheet metal part, and the second downward blanking gap is 8% of the thickness of the sheet metal part.
4. The cutting portion burr-free processing technique according to claim 3, characterized in that:
the depth of the first upward blanking is 10% of the thickness of the sheet metal part, and the depth of the second upward blanking is 40% of the thickness of the sheet metal part;
the depth of the first downward blanking is 30-40% of the thickness of the sheet metal part, and the depth of the second downward blanking is 10-20% of the thickness of the sheet metal part.
5. The cutting portion burr-free processing process as claimed in claim 1, characterized by forming steps of:
s1, performing the first engineering on the sheet metal part, wherein the sheet metal part comprises a first sheet metal part and a second sheet metal part; the first engineering is to punch a second sheet metal part upwards at a certain punching gap, the cross section of the sheet metal part is mainly subjected to shear stress and generates elastic strain, the lower surface of the first sheet metal part forms an upward collapsed angle, the upper surface is torn, and no burr or slight burr is generated;
s2, performing a second engineering on the second sheet metal part, and adjusting a blanking gap, wherein the second engineering is to blank the second sheet metal part upwards, the cross section of the sheet metal part is mainly subjected to shear stress to generate plastic strain, so that the sheet metal part generates a lower cutting surface, and in the second engineering, the first sheet metal part and the second sheet metal part are kept sheared and not separated;
s3, performing a third engineering on the second sheet metal part, and keeping a blanking gap of the second engineering, wherein the third engineering is to blank the second sheet metal part downwards, and the cross section of the sheet metal part is mainly subjected to shear stress to generate plastic strain, so that an upper cutting surface is generated on the cross section of the first sheet metal part;
s4, performing an IV project on the second sheet metal part, and adjusting a blanking gap, wherein the IV project is to blank the second sheet metal part downwards, the cross section of the sheet metal part is mainly subjected to shear stress to generate elastic strain, and a fracture surface is generated in the middle of the sheet metal part, so that the first sheet metal part is separated from the second sheet metal part, and the fracture separation is completed; in the IV engineering, blanking and cutting are finished by using a cutting punch, and burrs on the upper surface of the first metal plate part are removed by chamfering, so that the upper surface generates a downward collapsed angle;
wherein, the blanking clearance of the first engineering is controlled to be smaller than that of the second engineering;
and controlling the blanking clearance of the IV engineering to be smaller than that of the III engineering.
6. The cutting portion burr-free processing technique according to claim 5, characterized in that:
the cutting punch used in step S4 has an R angle of R0.4 and a blanking inclination of 105 °.
7. The burr-free process of a cut-off portion according to claim 5 or 6, wherein:
in the step S1, the upward punching depth of the second sheet metal part is 10% of the thickness of the sheet metal part;
in step S2, the upward punching depth of the second sheet metal part is 40% of the thickness of the sheet metal part;
in the step S3, the downward blanking depth of the second sheet metal part is 30-40% of the thickness of the sheet metal part;
in step S4, the downward punching depth of the second sheet metal part is 10-20% of the thickness of the sheet metal part.
8. The cut-off portion burr-free processing process according to claim 5 or 6, characterized in that:
in step S1, the upward blanking gap of the second sheet metal part is 8% of the thickness of the sheet metal part;
in the step S2, the upward blanking gap of the second sheet metal part is 10% of the thickness of the sheet metal part;
in the step S3, the downward blanking gap of the second sheet metal part is 10% of the thickness of the sheet metal part;
in step S4, the blanking gap of the second sheet metal part is 8% of the thickness of the sheet metal part.
9. The utility model provides a cutting off portion does not have burr sheet metal component product which characterized in that: the burr-free machining process according to any of claims 1 to 8.
10. The cut-off portion burr-free sheet metal part product of claim 9, characterized in that: the cutting cross section of the burr-free sheet metal part product at the cutting part sequentially shows the distribution of the collapsed angle, the cutting surface, the broken surface, the cutting surface and the collapsed angle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210026714.4A CN114523031B (en) | 2022-01-11 | 2022-01-11 | Processing technology for cutting part without burr and product thereof |
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| CN202210026714.4A CN114523031B (en) | 2022-01-11 | 2022-01-11 | Processing technology for cutting part without burr and product thereof |
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Cited By (1)
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| CN117282844A (en) * | 2023-11-23 | 2023-12-26 | 江苏常丰精密科技有限公司 | Stretching and trimming die for square shell of power battery |
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|---|---|
| CN114523031B (en) | 2023-12-15 |
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