CN109926646B - Bar shearing tool - Google Patents
Bar shearing tool Download PDFInfo
- Publication number
- CN109926646B CN109926646B CN201910150922.3A CN201910150922A CN109926646B CN 109926646 B CN109926646 B CN 109926646B CN 201910150922 A CN201910150922 A CN 201910150922A CN 109926646 B CN109926646 B CN 109926646B
- Authority
- CN
- China
- Prior art keywords
- cutter
- shearing
- bar
- tool
- lower cutter
- Prior art date
- 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.)
- Active
Links
- 238000010008 shearing Methods 0.000 title claims abstract description 77
- 238000005520 cutting process Methods 0.000 claims abstract description 46
- 230000007306 turnover Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 238000003466 welding Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Abstract
The invention relates to a bar shearing tool, which mainly solves the problems that the existing tool has fewer shearing edges, can not realize turn-over use, has poor strength of part of the tools and the like. The bar shearing tool comprises an upper tool and a lower tool; the upper cutter and the lower cutter are square, and shearing cutting edges are arranged on four edges of the upper cutter and the lower cutter, and the thickness of the upper cutter and the lower cutter is greater than or equal to the diameter of the maximum sheared bar. The shearing edge radius ra= (d+c)/2 of the upper tool and the shearing edge radius rb= ((d+c) ×1.02)/2 of the lower tool, wherein D is the nominal diameter of the bar and C is the deviation in the diameter of the bar.
Description
Technical Field
The invention relates to a processing device, in particular to a bar shearing tool.
Background
Precision shearing is widely applied to forging enterprises due to high shearing speed, high efficiency and good end face quality. The round bar precision shearing tool is generally in the following three common forms, namely, as shown in fig. 1, the upper and lower tools are both narrow and long cuboid, and a single circular arc is respectively arranged on the cuboid as a shearing edge; second, as shown in figure 2, the upper and lower cutters are cuboid, and two ends of the cuboid are respectively provided with an arc as a shearing edge; third, as shown in fig. 3 and 4, the upper cutter is a cuboid, and two ends of the cuboid are respectively provided with an arc as a shearing cutting edge, the lower cutter is cylindrical, and the three types of cutters have the following problems:
1) The number of the shearing edges of the upper and lower cutters along the shearing direction is only one to two, so that the number is small;
2) The cutter has improper thickness, and can not be turned over for use;
3) The cutter edge corresponding to the bar is improper in size, the quality of the end face of the sheared blank is poor, and the shearing precision is poor;
4) The strength of part of the cutters is poor, and the basis for repeated use of the cutters is avoided;
5) The cutting edge is also repaired by adopting a build-up welding mode after being worn, but the build-up welding process is complex, long in working procedure, high in cost and easy to have defects, and the blocks are easy to fall off when the cutting edge is reused, so that the normal shearing life is not achieved.
Disclosure of Invention
In order to solve the problems in the background technology, the invention provides a bar shearing tool.
The technical scheme of the invention is as follows:
a bar shearing tool, comprising an upper tool and a lower tool; the end faces of the upper cutter and the lower cutter are square, the shearing edges are arranged on four edges of the upper cutter and the lower cutter, the thickness of the upper cutter and the thickness of the lower cutter are larger than or equal to the diameter of a maximum sheared bar, the shearing edge radius RA= (D+C)/2 of the upper cutter, the shearing edge radius RB= ((D+C) multiplied by 1.02)/2 of the lower cutter, wherein D is the nominal diameter of the bar, and C is the upper deviation of the diameter of the bar.
Further, the four edges of the upper cutter and the lower cutter are respectively provided with shearing cutting edges with different specifications and sizes.
Further, the square side length of the upper cutter and the square side length of the lower cutter are 3 times of the diameter of the sheared bar.
Further, a cross groove is formed in the end face of the upper cutter.
Further, the upper cutter and the lower cutter are provided with mounting holes connected with the cutter holder.
Further, the lower cutter is provided with a connecting hole connected with the base plate.
Further, a hoisting hole for hoisting is formed in the lower cutter.
Further, a pushing hole and a marking groove are formed in the middle of the end face of the lower cutter.
Further, the sizes of the shearing cutting edges of the upper cutter and the lower cutter are designed to be N mm first gear, and N is a positive integer greater than or equal to 1.
Further, the sizes of the shearing cutting edges of the upper cutter and the lower cutter are designed to be 5mm first gear.
Compared with the prior art, the invention has the following technical effects:
1. the end surfaces of the upper cutter and the lower cutter are square, and the shearing circular arcs can be increased to four, so that the application range of the cutters is increased; the thickness of the upper cutter and the lower cutter is designed to be similar to the diameter of the bar stock with maximum shearing, so that the cutters can be turned over for use.
2. According to the invention, the size of the shearing cutting edge is designed into multiple grades according to the specification of the bar, and a strict dimensional relationship exists between the size of the cutting edge and the diameter of the bar, so that the quality and shearing precision of the end face of the sheared blank are ensured; the length, width and thickness of the cutter are respectively 3 times and 1 time of the diameter of the maximum shearable bar, so that the strength of the cutter is ensured, and a foundation is laid for the repeated use of the subsequent cutter.
3. When the cutter is put into operation, the cutter with small cutting edge size is put into operation firstly, and after four shearing circular arcs, namely eight shearing cutting edges, are worn out completely, the cutter can be changed and expanded to the next specification for continuous use, so that various problems caused by surfacing welding multiplexing are avoided.
Drawings
FIG. 1 is a schematic diagram of a round bar precision shearing tool with narrow and long cuboid upper and lower tools in the prior art;
FIG. 2 is a schematic diagram of a round bar precision shearing tool with rectangular upper and lower tools in the prior art;
FIG. 3 is a schematic diagram of a conventional round bar precision shearing tool with a rectangular upper tool;
FIG. 4 is a schematic view of a conventional cylindrical round bar precision shearing tool with a lower tool;
FIG. 5 is a schematic view of a bar shear cutter according to the present invention;
FIG. 6 is a schematic diagram of a bar shear cutter according to the present invention;
fig. 7 is a schematic view of the bar shear tool shearing process of the present invention.
Reference numerals: the device comprises a first cutter, a second cutter, a third cutter, a cutting edge, a 4-mounting hole, a 5-baffle block, a 6-material supporting device, a 11-cross groove, a 21-connecting hole, a 22-lifting hole, a 23-material pushing hole and a 24-marking groove.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and specific examples:
a bar shearing tool as shown in fig. 5 and 6, comprising an upper tool 1 and a lower tool 2; the end faces of the upper cutter 1 and the lower cutter 2 are square, namely the length and the width are equal, the shearing cutting edges 3 are arranged on four edges of the upper cutter 1 and the lower cutter 2, and the thickness of the upper cutter 1 and the thickness of the lower cutter 2 are larger than or equal to the diameter of the maximum sheared bar.
The end face of the upper cutter 1 is provided with a cross groove 11, and the depth of the cross groove formed in the middle is related to the material of the sheared bar, and the cross groove is mainly used for adjusting the gap between the upper cutter 2 and the lower cutter 2. The upper cutter 1 and the lower cutter 2 are provided with mounting holes 4 connected with the cutter holder, so that the cutter holder can be conveniently mounted.
When the length of the cut bar is smaller, the thickness of the upper cutter is smaller than that of the cut bar, and a base plate is required to be arranged to compensate the installation space of the upper cutter 1. The lower cutter 2 is provided with a connecting hole 21 connected with the backing plate. The lower cutter 2 is provided with a lifting hole 22 for lifting, mainly for mounting and dismounting. The middle part of the end face of the lower cutter 2 is provided with a pushing hole 23 and a marking groove 24, and four holes in the middle of the lower cutter 2 are through holes when a pushing rod pushes out a sheared blank; the kidney-shaped groove in the middle part is a marking groove 24 for setting a mark for the cutter.
The sizes of the cutting edges of the upper cutter 1 and the lower cutter 2 are designed to be N mm first, N is a positive integer greater than or equal to 1, and specifically, the sizes of the cutting edges of the upper cutter 1 and the lower cutter 2 are designed to be 5mm first.
The length and width directions of the upper cutter 1 and the lower cutter 2 are designed to be square, and the shearing arcs can be increased from one to two to four, so that arcs can be machined on four sides of the shearing arcs, namely 8 cutting edges are arranged on the upper cutter 1 and the lower cutter 2 (namely four shearing arcs are respectively arranged on the upper cutter 2 and the lower cutter 2). Therefore, when the cutter is used singly under the same condition, the shearing quantity of the cutter is 4 times that of the cutter in the form of fig. 1, and is 2 times that of the cutters in the forms of fig. 2 and 3.
If the width of the cutter is B (along the shearing direction), the diameter of the maximum sheared bar is D, and in order to ensure the strength of the shearing cutter, the requirement of B is more than or equal to 1.5D when a single cutting edge is provided, and the requirement of B is more than or equal to 3D when a double cutting edge is provided; secondly, for the purpose of achieving a usable four-way design, the upper and lower cutters 2 should be square in design. FIG. 1 cannot be designed as a double-edged edge because of insufficient width; fig. 1, 2 and 3 cannot be designed as square because of the structural limitations of the tool holder.
The thickness of the cutter is designed to be similar to the diameter of the maximum sheared bar, namely, the cutter can be turned over for use, so that the actual shearing quantity can be turned over by 1 time when the single-piece cutter is used once. Because the failure mode of the cutting edge is mainly collapse deformation when the bar is sheared, the original arc-shaped cutting edge is deformed into a horn-shaped cutting edge. If the thickness of the cutter is H and the deformation width is H, the H is generally 1/4-1/3 of the diameter D of the bar, and if the cutter is used for turning, the effective cutting edge size of the other side after turning must be ensured, so that the thickness H of the cutter is at least equal to the diameter of the bar subjected to maximum shearing, namely H is more than or equal to D.
According to practical experience, a strict dimensional relationship exists between the size of the cutting edge and the diameter of the bar. If the nominal diameter of the bar is D and the diameter deviation is C, the upper cutting edge radius RA= (D+C)/2 and the lower cutting edge radius RB= ((D+C) ×1.02)/2. Wherein D is the nominal diameter of the bar with the shearing standard corresponding to each cutting edge, C is the diameter deviation of the bar with the shearing standard corresponding to each cutting edge, the four edges of the upper cutter and the lower cutter are respectively provided with shearing cutting edges with different standard sizes or the same standard size, and each shearing cutting edge corresponds to a bar with the shearing standard. The invention designs the cutting edge size strictly according to the empirical formula, and can ensure the quality and the shearing precision of the end face of the sheared blank; meanwhile, the cutting edge size is designed in a series mode according to the bar specification, and the cutting edge size is 5mm in one grade, so that the cutting edge is convenient to reuse.
When the cutter is put into operation, firstly, the small-size cutting edge cutter is put into operation, after four shearing circular arcs, namely 8 shearing cutting edges, are worn completely, the cutting edges are changed and expanded to the next specification for continuous use, and then worn, and then changed and expanded until the cutting edges are changed and expanded to the maximum cutting edge size. For example, the initial casting of the blade for the bar with the phi 60 specification is changed into the blade for the bar with the phi 65 specification after abrasion, and the like until the maximum specification is changed. The blade reuse method is that the build-up welding is repaired to the original size, but the build-up welding process is complex, the working procedure is long, the cost is high, the blade is easy to be defective, the block is easy to fall off during reuse, the normal shearing life is not reached, and the like. Compared with the prior art, the method for changing the multiplexing of the expansion cutting edge is simpler, more convenient and feasible, has low cost and good effect, and effectively avoids various problems caused by the multiplexing of build-up welding. The method has the advantage of being easier to show when the shearing batch is large and the shearing bar stock is large in specification.
As before, when the double cutting edge is used, B is more than or equal to 3D, the upper cutter and the lower cutter are designed to be square so as to be available in four directions, and the multiplexing is comprehensively considered, so that in the invention, the length and width dimensions of the cutter are 3D, the thickness dimension is 1D, and the material is most saved on the basis of ensuring the strength of the cutter, thereby laying a foundation for the repeated use of the subsequent cutter.
If the shearing life of the cutter shown in fig. 1 is X, the total life of the cutter of the present invention can reach 40 times that of fig. 1, and the specific calculation is as follows: the number of the cutting edges of the invention is four times that of the cutting edges of the invention shown in figure 1; the expansion is changed from the minimum standard to the maximum standard, and is changed to double the standard from phi 50, phi 56, phi 60, phi 65, phi 70, phi 75, phi 80, phi 85, phi 90 and phi 100 in sequence. Therefore, the actual shearing quantity of the single-piece cutter can reach forty times of the cutter blade in the figure 1, thereby greatly reducing the cost of the precise shearing cutter.
The shearing process of the cutter used in the invention is shown schematically in fig. 7: the upper blade moves up and down along with the sliding block, the lower blade is fixed, and the baffle block 5 is used for limiting the feeding position of the bar. During shearing, the bar material is fed into the contact stop block 5, the upper edge is driven by the sliding block to shear the bar material downwards, the material supporting device 6 is driven to downwards move, the sheared blank material is pushed out by the sheared material pushing rod, the sliding block returns, and the primary shearing is completed.
The shearing tool breaks through the existing tool structure and tool use technical thought, and the designed novel round bar precision shearing tool shown in fig. 5 and 6 can not only greatly improve the first shearing quantity of the single-piece tool, but also realize repeated use of the single-piece tool, and the actual shearing quantity of the single-piece tool can be increased by forty times on the basis of the original maximum, so that the cost of the precision shearing tool is greatly reduced.
Claims (7)
1. A bar shearing tool, characterized in that: comprises an upper cutter (1) and a lower cutter (2);
the end faces of the upper cutter (1) and the lower cutter (2) are square, shearing cutting edges (3) are arranged on four edges of the upper cutter (1) and the lower cutter (2), and the thickness of the upper cutter (1) and the thickness of the lower cutter (2) are larger than or equal to the diameter of a maximum sheared bar;
the shearing edge radius RA of the upper cutter (1) is = (D+C)/2, and the shearing edge radius RB of the lower cutter (2) is = ((D+C) multiplied by 1.02)/2, wherein D is the nominal diameter of the bar, and C is the deviation of the diameter of the bar;
the four edges of the upper cutter (1) and the lower cutter (2) are respectively provided with shearing cutting edges (3) with different specifications and sizes;
the square side length of the upper cutter (1) and the square side length of the lower cutter (2) are 3 times of the diameter of the sheared bar;
the end face of the upper cutter (1) is provided with a cross groove (11).
2. A bar shear tool as claimed in claim 1, wherein: and mounting holes (4) connected with the tool apron are formed in the upper tool (1) and the lower tool (2).
3. A bar shear tool as claimed in claim 2, wherein: the lower cutter (2) is provided with a connecting hole (21).
4. A bar shear tool according to claim 3, wherein: and a hoisting hole (22) for hoisting is formed in the lower cutter (2).
5. A bar shear tool as in claim 4, wherein: the middle part of the end face of the lower cutter (2) is provided with a pushing hole (23) and a marking groove (24).
6. A bar shear tool as in claim 5, wherein: the sizes of the shearing cutting edges of the upper cutter (1) and the lower cutter (2) are designed to be N mm first grade, and N is a positive integer greater than or equal to 1.
7. A bar shear tool as in claim 6, wherein: the sizes of the shearing cutting edges of the upper cutter (1) and the lower cutter (2) are designed to be 5mm first grade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910150922.3A CN109926646B (en) | 2019-02-28 | 2019-02-28 | Bar shearing tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910150922.3A CN109926646B (en) | 2019-02-28 | 2019-02-28 | Bar shearing tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109926646A CN109926646A (en) | 2019-06-25 |
| CN109926646B true CN109926646B (en) | 2024-04-12 |
Family
ID=66986040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910150922.3A Active CN109926646B (en) | 2019-02-28 | 2019-02-28 | Bar shearing tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109926646B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3418874A (en) * | 1965-09-03 | 1968-12-31 | Garringtons Ltd | Stock shear having a pair of pivotal shear blades |
| US5950314A (en) * | 1997-08-05 | 1999-09-14 | Chang; Jung-Hsien | Step-separating shearing tool |
| CN203992027U (en) * | 2014-08-13 | 2014-12-10 | 陈丽丽 | Circular two part sheared blank mould |
| CN208528202U (en) * | 2018-07-05 | 2019-02-22 | 成都莱克冶金机械设备制造有限公司 | Suitable for shearing the hydraulic tiltedly cutting edge of circular blank |
| CN210121701U (en) * | 2019-02-28 | 2020-03-03 | 宝鸡法士特齿轮有限责任公司 | Bar shearing tool |
-
2019
- 2019-02-28 CN CN201910150922.3A patent/CN109926646B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3418874A (en) * | 1965-09-03 | 1968-12-31 | Garringtons Ltd | Stock shear having a pair of pivotal shear blades |
| US5950314A (en) * | 1997-08-05 | 1999-09-14 | Chang; Jung-Hsien | Step-separating shearing tool |
| CN203992027U (en) * | 2014-08-13 | 2014-12-10 | 陈丽丽 | Circular two part sheared blank mould |
| CN208528202U (en) * | 2018-07-05 | 2019-02-22 | 成都莱克冶金机械设备制造有限公司 | Suitable for shearing the hydraulic tiltedly cutting edge of circular blank |
| CN210121701U (en) * | 2019-02-28 | 2020-03-03 | 宝鸡法士特齿轮有限责任公司 | Bar shearing tool |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109926646A (en) | 2019-06-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2563771C (en) | Tip for demolition and construction equipment | |
| US9132490B2 (en) | Interlocking tip for demolition and construction equipment | |
| CN204997118U (en) | But blade is milled in transposition and milling cutter thereof | |
| CN109926646B (en) | Bar shearing tool | |
| CN103846488B (en) | A kind of cutting to length system and cutting to length method | |
| CN210121701U (en) | Bar shearing tool | |
| CN203031010U (en) | Three-edge milling cutter | |
| CN2915336Y (en) | Round metal cutting scissors | |
| CN204954974U (en) | Point is tear line puncher absolutely easily | |
| CN2910435Y (en) | Blanking machine for metal strip | |
| CN201537744U (en) | Steel grating plate shearing blade | |
| CN205463840U (en) | Die -cut unloading mould of shaped steel | |
| CN101428358B (en) | Combined cutter for shearing steel grating | |
| CN103056217B (en) | U-shaped girder cutting device | |
| CN105014709A (en) | Device for cutting automobile rubber parts | |
| CN207857943U (en) | The manual feeding limit assembly of plate shearing machine | |
| CN218614495U (en) | Circle-in-circle shearing type die cutting device | |
| CN104708039A (en) | Novel blade and manufacturing method thereof | |
| CN107891247B (en) | Blanking method of long straight strip metal part | |
| CN217832146U (en) | Scraper for removing burrs of plate blank | |
| CN220880765U (en) | Special blade of non-standard scrap shearing equipment | |
| CN114425639B (en) | Cutter head, manufacturing method thereof and gang saw | |
| CN109291172A (en) | Facilitate the process tool for adjusting axial spacing | |
| CN101780561B (en) | Steel lattice plate cutting knife | |
| CN210147105U (en) | Disc shearing machine capable of rapidly matching cutters |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |