CN114589243B

CN114589243B - Novel blanking and knife-connecting process

Info

Publication number: CN114589243B
Application number: CN202210206867.7A
Authority: CN
Inventors: 曹雅琴
Original assignee: Guangzhou Sunnyway Metal Products Co ltd
Current assignee: Guangzhou Sunnyway Metal Products Co ltd
Priority date: 2022-03-04
Filing date: 2022-03-04
Publication date: 2023-07-25
Anticipated expiration: 2042-03-04
Also published as: CN114589243A

Abstract

The invention relates to a novel blanking and knife-connecting process, wherein a knife-connecting edge is designed on an arc line of a product R to ensure the complete function of a straight plane of the product; the problems of heavy cutting, poor cutting and section difference easily existing at the processing edge of the part are reduced, the knife edge is designed into an irregular shape, the scrap can be effectively prevented from jumping out of the lower die, and the safe and efficient production environment is ensured; the arc-shaped notch is formed by cutting off the material with the thickness of about 0.05mm on the arc line of the original product R, so that burrs are avoided from being generated at the cutter receiving position due to repeated cutting or sharp angles are avoided due to incomplete cutting, and the reject ratio of the product caused by overlarge burrs is reduced.

Description

Novel blanking and knife-connecting process

Technical Field

The invention relates to the technical field of automatic processing, in particular to a novel blanking and knife-connecting process.

Background

In the existing blanking process, if a round rectangular part is to be processed, a plurality of blanking knives are usually used for processing in different processing areas, and at the joint position of two different blanking knives, due to the defect of the process or the aging of the blanking knives, burrs of a scraping hand usually exist, so that the use experience is seriously affected, and the specific problems are as follows:

as shown in fig. 1: for blanking of a round-corner rectangular part, designing a cutter connecting position on a straight surface of a machined part, wherein the cutter connecting mode can generate processing step difference on the straight surface of a product part due to different errors of two cutters and accumulation of errors in the cutter connecting process, so that the contour of the product is different, if a customer has no specific requirement on the outer contour of the product, a designer can submit a DFM, and design and processing are carried out after the customer agrees; this design flow increases the designer's workflow and is not satisfactory if the customer has high demands on the product's profile.

As shown in fig. 2: for the blanking of a fillet rectangle part, will connect the sword position design on the handing-over cambered surface of two straight faces of machined part, this kind connects the sword mode can be seen from the enlarged drawing, and the juncture does not combine closely, and the sharp angle of scraping the hand can be produced to the profile of product, and after the cutter production has for a long time and wearing and tearing passivation, when making waste material and part break away from, the waste material of company can make the material of this sharp angle department can downwardly stretching, produces obviously cuts sharp burr, seriously influences customer's normal use.

Disclosure of Invention

Aiming at the defects existing in the prior art, the invention aims to provide a novel blanking and knife-connecting process for solving the problem that burrs are easily generated at a knife-connecting edge in the existing blanking process to influence the quality of products.

The technical aim of the invention is realized by the following technical scheme: novel blanking and knife-connecting process, S1: dividing the contour of the part to be blanked into a plurality of first parts and a plurality of second parts; the first parts and the second parts are alternately arranged and sequentially connected end to end; the joints of the first parts and the second parts are all positioned on the arc-shaped edge of the part;

s2: cutting a plurality of first cutters along the contours defined by the first parts, wherein the initial positions of the first cutters and the final positions of the first cutters extend 0.02-0.07 mm towards the inner part of the arc-shaped edge of the part to form arc-shaped notches;

s3: cutting a plurality of second knives along the contours defined by the plurality of second portions; and the starting positions of the second cutters and the end positions of the second cutters are connected with the arc-shaped notch.

Optionally, in the step S2, the distance that the arc-shaped notch extends inward of the arc-shaped edge is 0.05mm.

Optionally, in step S1, the contour edge of the part to be blanked with a rounded rectangle is divided into two first portions and two second portions, where the two first portions and the two second portions are alternately arranged and connected end to end in sequence, and two ends of the two first portions and two ends of the two second portions are located on the arc edge of the part.

Optionally, in the step S2, the plurality of first knives and the plurality of second knives each include: a straight knife edge that cuts along the straight edge of the profile of the part and a curved knife edge that cuts along the curved edge of the profile of the part.

In summary, the invention has the following beneficial effects: the invention provides a novel blanking and knife-connecting process, which reduces the problems of heavy cutting, poor cutting and section difference easily existing at the processing edge of a part by providing a knife-connecting process for part blanking, and the knife-connecting edge is designed on the arc line of a product R to ensure the functional integrity of the straight plane of the product; the knife edge is designed into an irregular shape, so that waste materials can be effectively prevented from jumping out of the lower die, and the safe and efficient production environment is ensured; the arc-shaped notch is formed by cutting off the material with the thickness of about 0.05mm on the arc line of the original product R, so that burrs are avoided from being generated at the cutter receiving position due to repeated cutting or sharp angles are avoided due to incomplete cutting, and the reject ratio of the product caused by overlarge burrs is reduced.

Drawings

FIG. 1 is a schematic view and enlarged view of a straight edge knife attachment portion in a conventional production process;

FIG. 2 is a schematic view and an enlarged view of an arc edge cutter attachment part in the prior art;

FIG. 3 is a schematic view and an enlarged view of a portion where there is a heavy cut in blanking production;

FIG. 4 is a schematic view and an enlarged view of a part with a difference in blanking;

fig. 5 is a schematic view and an enlarged view of a part having a step in blanking production;

FIG. 6 is a schematic view and enlarged view of the arcuate edge cutting portion of the present invention;

FIG. 7 is a schematic view of a regular smooth cutter port;

FIG. 8 is an irregular cutting edge of the present invention;

in the figure: 1. a first knife; 2. a second knife; 3. a part; 4. sharp corners; 5. an arc-shaped notch; 6. regular smooth cutting edges; 7. irregular cutting edges; 8. a straight knife edge; 9. an arc-shaped knife edge.

Detailed Description

In order that the objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances. The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature. The terms "vertical," "horizontal," "left," "right," "up," "down," and the like are used for descriptive purposes only and are not to indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

The present invention will be described in detail below with reference to the accompanying drawings and examples.

Referring to fig. 3-6, the invention provides a novel blanking and cutting process, which comprises the following steps: s1: dividing the contour of the part 3 to be blanked into a plurality of first portions and a plurality of second portions; the first parts and the second parts are alternately arranged and sequentially connected end to end; the joints of the first parts and the second parts are all positioned on the arc-shaped edge of the part 3; s2: cutting a plurality of first cutters 1 along the outlines defined by the first parts, wherein the initial positions of the first cutters 1 and the final positions of the first cutters 1 extend 0.02-0.07 mm towards the inner part of the arc-shaped edge of the part 3 to form an arc-shaped notch 5; s3: cutting a plurality of second knives 2 along the contours defined by a plurality of said second portions; the initial positions of the second cutters 2 and the final positions of the second cutters 2 are connected with the arc-shaped notch 5.

Specifically, in the actual production process, when the design of the stamping progressive die is carried out, the design of the knife edge directly relates to whether the appearance of the product can be completely blanked out, if the design is deficient, the incomplete blanking of the product is likely to be caused, until the last step, the product is still connected on the material belt, or the knife edge is over-cut, and the edge of the product is not level and is provided with a notch. Please refer to fig. 3, 4, and 5: under the condition that two knives are designed to have a common straight edge, when materials are blanked along with a feeder, because a gap between a blanking plate contact pin and a blanking plate is in sliding fit, the lower die floating pin is in loose fit, error accumulation is easy to cause, and as a direct result, burrs are pulled out from the positions where the two knives are overlapped due to repeated cutting positions of the two knives (namely, heavy cutting shown in fig. 3), the two knives are inadequately cut, a product is connected on a material belt (namely, the poor cutting of fig. 4), or the two knives are cut out with a section difference due to inconsistent precision (namely, the section difference of fig. 5). The invention provides a blanking and connecting method for processing a part 3 with an arc-shaped edge, which divides the edge profile of the part into a plurality of first parts and a plurality of second parts, wherein the first parts and the second parts are sequentially and alternately arranged, as shown in fig. 6, for a round-angle rectangular part 3, four straight edges of the round-angle rectangular part 3 are divided into two first parts and two second parts, the first parts and the second parts are alternately arranged, and the connection parts of the first parts and the second parts are arranged on the arc-shaped edge of the profile; thus, the problem of the cutting phenomenon or the section difference phenomenon which is easily generated when the cutter is connected to the straight edge can be solved. Further, the starting position and the end position of the first knife 1 extend to a part of the inside of the arc edge of the part 3 to form an arc notch 5, when the second knife 2 cuts, the starting position of the second knife 2 is just at the arc notch 5 of the end position of the first knife 1, and the end position of the second knife 2 is just at the arc notch 5 of the starting position of the other first knife 1 adjacent to the starting position of the second knife, and as the two ends of the second knife 2 are provided with the arc notch 5, the connection of the second knife 2 at the connection positions of the two ends is avoided, so that waste materials are more easily separated from products, and the problem that the sharp angle 4 exists at the knife receiving position is also solved.

Further, in the step S2, the distance that the arc-shaped notch 5 extends inward of the arc-shaped edge is 0.05mm.

Further, in the step S1, the contour edge of the part to be blanked with a rounded rectangle is divided into two first portions and two second portions, the two first portions and the two second portions are alternately arranged and connected end to end in sequence, and both ends of the two first portions and both ends of the two second portions are located on the arc-shaped edge of the part.

Further, in the step S2, the plurality of first knives and the plurality of second knives each include: a straight knife edge 72 that cuts along the straight edge of the profile of the part and a curved knife edge 71 that cuts along the curved edge of the profile of the part. Specifically, referring to fig. 7, when the cut made by the punch is a regular and smooth cut edge 6, the edge stress of the punched material is uniform, and when the die is produced in batch, viscous liquid such as emulsion, punching shear oil and the like is added to protect the punch from cooling and lubrication, at this time, when the surface of the waste material is attached to the punch surface without gaps due to the addition of the liquid, the friction force between the waste material and the die wall is insufficient to overcome the influence of the punch, so that the waste material jumps out of the die, the waste material jumping out of the die is easy to crush the materials of other stations, and when serious, a plurality of waste materials are accumulated to cause the die burst. As shown in fig. 8, the design of the irregular cutter opening 7 is adopted (that is, the two ends of the first cutter 1 and the second cutter 2 are both positioned at the arc edges, so that the cutting edges are prevented from being straight), and in the production and working process of the die, the internal stress of the edge of the blanked waste is unbalanced when the punch breaks the material and pierces the lower die edge insert, so that the material in some places can generate micro extrusion cutter edge cavities, the waste can be clamped in the lower die edge insert, the lower die surface can not be brought out by the punch, and the problem of waste die jump is effectively solved.

In the application, a customer designs an R angle instead of a sharp angle 4 for a product, prevents the sharp angle 4 from hurting people, and simultaneously has the effect of preventing interference when other parts are assembled, so that the design of a knife edge on an R arc does not influence the normal use of the product, ensures that no step is generated on the straight edge of the product, simultaneously, can avoid the condition that the knife edge shape is in a regular pattern, avoids that waste materials jump out of a lower die, and the two ends of each knife are contacted with the arc and are not in a regular straight line, thereby effectively preventing the waste materials from being pressed against the product along with the fact that a punch head is taken out of the lower die surface, and reducing the maintenance cost of the die; the knife connecting scheme can not cause the phenomenon that burrs are pulled out after the knife becomes blunt, and the phenomenon that sharp corners 4 are not cut off due to incomplete knife connecting can not occur on the surface of a product.

In summary, the invention provides a knife connecting process for blanking the part 3, which reduces the problems of heavy cutting, poor cutting and section difference easily existing in the processing edge of the part 3, and designs a knife connecting edge on the arc line of the product R to ensure the complete function of the straight plane of the product; the knife edge is designed into an irregular shape, so that waste materials can be effectively prevented from jumping out of the lower die, and the safe and efficient production environment is ensured; the arc-shaped notch 5 is formed by cutting off the material with the thickness of about 0.05mm on the arc line of the original product R, so that burrs are avoided from being generated at the cutter receiving position due to repeated cutting or sharp corners 4 are avoided from being generated due to incomplete cutting, and the reject ratio of the product caused by overlarge burrs is reduced.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.

Claims

1. The novel blanking and knife-connecting process is characterized by comprising the following steps of:

s1: dividing the contour edge of a round-corner rectangular part to be blanked into two first parts and two second parts, wherein the two first parts and the two second parts are alternately arranged and sequentially connected end to end, and both ends of the two first parts and both ends of the two second parts are positioned on the arc-shaped edge of the part;

s2: cutting two first cutters along the contour defined by the two first parts, wherein the starting positions of the two first cutters and the ending positions of the two first cutters extend 0.05mm towards the inside of the arc-shaped edge of the part to form an arc-shaped notch;

s3: cutting two second knives along the contours defined by the two second portions; the initial positions of the two second cutters and the final positions of the two second cutters are connected with the arc-shaped notch; both of the first and second knives include: a straight knife edge cutting along a straight edge of the profile of the part and a curved knife edge cutting along a curved edge of the profile of the part;

in the production working process of the die, the two ends of the first knife and the second knife are positioned at the arc edges, so that the cut edges are prevented from being straight, and because the shapes of the two ends of the cut-off knife are irregular, when the punch breaks the material and pricks into the lower die edge insert, the internal stress of the blanked scrap edge is unbalanced, so that the material in some places can squeeze the edge cavity, the scrap can be clamped in the lower die edge insert, the punch can not take out of the lower die surface, and the problem of scrap die jump is avoided.