CN108296404A - A kind of high speed nut molding machine nut stroke mould and its lower mold core - Google Patents
A kind of high speed nut molding machine nut stroke mould and its lower mold core Download PDFInfo
- Publication number
- CN108296404A CN108296404A CN201711461663.3A CN201711461663A CN108296404A CN 108296404 A CN108296404 A CN 108296404A CN 201711461663 A CN201711461663 A CN 201711461663A CN 108296404 A CN108296404 A CN 108296404A
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- China
- Prior art keywords
- mold core
- phases
- nut
- formwork
- lower mold
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/56—Making machine elements screw-threaded elements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds, Cores, Or Mandrels (AREA)
Abstract
The invention discloses a kind of high speed nut molding machine nut stroke mould lower mold cores, and material is to meet the hard alloy of following physical performance index：84 ~ 85HRA of hardness, 3100 ~ 3200N/mm2 of bending strength, cobalt magnetic 16 ~ 17%, 2 ~ 2.5 μm of granularity, A02+B00 grades of porosity, C00 grades of free charcoal element, α phases 1 ~ 2, β phases 0.5 ~ 2.0 cannot have η phases.A kind of high speed nut molding machine nut stroke mould is also provided, includes stroke formwork with formwork endoporus and the upper mold core, the lower mold core that are fixedly installed in formwork endoporus, lower mold core uses above-mentioned material.Compared with the prior art, the present invention can improve mold service life, promote cold upsetting production operating efficiency, reduce the cost in period die life.
Description
Technical field
The present invention relates to mould manufacturing field, especially a kind of high speed nut molding machine nut stroke mould.
Background technology
Currently, hex nut within M10 ~ M24 generally uses high-speed cold heading machine to produce, high-speed cold heading machine have high speed,
In high precision, the productive prospectings such as high stable, cold-heading speed are higher by between 100 ~ 300/minute than the speed of traditional cold headers
2 times ~ 5 times.During high speed cold-pressed nut, mold bears the effect of high temperature, high speed, heavy shock loads, traditional shaping mould
Has service life<520h, average life span 260h or so.Since mold service life is short, cause cold upsetting production operating efficiency low, mould
The cost having in life cycle is high.
Invention content
The present invention provides a kind of high speed nut molding machine nut stroke mould that can improve service life.
To achieve the above object, the present invention provides a kind of high speed nut molding machine nut stroke mould lower mold core, and material is
Meet the hard alloy of following physical performance index：84 ~ 85HRA of hardness, 3100 ~ 3200N/mm2 of bending strength, cobalt magnetic 16 ~
17%, 2 ~ 2.5 μm of granularity, A02+B00 grades of porosity, C00 grades of free charcoal element, α phases 1 ~ 2, β phases 0.5 ~ 2.0 cannot have η phases.
A kind of high speed nut molding machine nut stroke mould is also provided, includes stroke formwork with formwork endoporus and solid
Dingan County is loaded on upper mold core, lower mold core in formwork endoporus, and lower mold core is using the hard alloy for meeting following physical performance index：Firmly
Spend 84 ~ 85HRA, 3100 ~ 3200N/mm2 of bending strength, cobalt magnetic 16 ~ 17%, 2 ~ 2.5 μm of granularity, A02+B00 grade of porosity is free
C00 grades of charcoal element, α phases 1 ~ 2, β phases 0.5 ~ 2.0 cannot have η phases.
In a wherein embodiment, upper mold core is using the hard alloy for meeting following physical performance index：Hardness 84 ~
85HRA, 3100 ~ 3200N/mm2 of bending strength, cobalt magnetic 16 ~ 17%, 2 ~ 2.5 μm of granularity, A02+B00 grades of porosity, free charcoal element
C00 grades, α phases 1 ~ 2, β phases 0.5 ~ 2.0 cannot have η phases.
In a wherein embodiment, upper mold core is using the hard alloy for meeting following physical performance index：Hardness 82 ~
85HRA, 2200 ~ 2500N/mm2 of bending strength, cobalt magnetic 20%, 1.2 μm of granularity.
Further include the retaining element for fixing upper mold core and lower mold core in a wherein embodiment.
In a wherein embodiment, the retaining element is interior regular hexagon bolt, the threaded hole with formwork endoporus lower part
Cooperation is fixed.
In a wherein embodiment, upper mold core by compression molding operation and formwork endoporus interference engagement, intrusion is 2.5 ~
3mm。
The beneficial effects of the invention are as follows：The present invention can improve mold service life, promote cold upsetting production operating efficiency, reduce
Cost in period die life.
Description of the drawings
Fig. 1 is the exploded sectional view of high speed nut molding machine nut stroke mould of the embodiment of the present invention.
Fig. 2 is the upward view of stroke formwork in high speed nut molding machine nut stroke mould shown in Fig. 1.
Fig. 3 is the upward view of interior regular hexagon bolt in high speed nut molding machine nut stroke mould shown in Fig. 1.
Fig. 4 is the assembling view of high speed nut molding machine nut stroke mould shown in Fig. 1.
Fig. 5 is for formwork in high speed nut molding machine nut stroke mould processing method of the embodiment of the present invention with mold core with mill group
The schematic diagram of die face taper step.
Fig. 6 is that electric spark high current is processed in high speed nut molding machine nut stroke mould processing method of the embodiment of the present invention
Centre mount
The schematic diagram of step.
Fig. 7 is four molding steps of electric spark in high speed nut molding machine nut stroke mould processing method of the embodiment of the present invention
Rapid schematic diagram.
Fig. 8 is first time molding electrode shape schematic diagram in four moldings of electric spark shown in Fig. 7.
Fig. 9 is second of molding electrode shape schematic diagram in four moldings of electric spark shown in Fig. 7.
Figure 10 is the molding electrode shape schematic diagram of third time in four moldings of electric spark shown in Fig. 7.
Figure 11 is the 4th molding electrode shape schematic diagram in four moldings of electric spark shown in Fig. 7.
Specific implementation mode
Below in conjunction with the accompanying drawings and example, the present invention will be further described.
In the present embodiment, high speed nut molding machine is primarily adapted for use in the high speed nut of 5 stations, 6 stations with nut stroke mould
Molding machine, nut specification limit are to meet GB/T6170, GB/T6171, GB/T6172.1, GB/T6173, GB/T6174, GB/
The nut of the cold heading technique production of M10 ~ M24 of the national regulations such as T56, due to the mold materials and manufacturing process principle of this series
Unanimously, parameter similar, the present embodiment are mainly illustrated by taking the mold of M12 as an example.
In the present embodiment, as shown in Fig. 1 to 5, high speed nut molding machine nut stroke mould includes stroke formwork 1, upper mold
Core 2, lower mold core 3, retaining element（Retaining element is interior regular hexagon bolt 4 in the present embodiment）.1 interposition of stroke formwork installs
There is formwork endoporus 11, formwork endoporus top is bellmouth, to accommodate upper mold core 2 and lower mold core 3.Formwork endoporus lower part is screw thread
Hole is coordinated by interior regular hexagon bolt 4 and threaded hole to coordinate with interior regular hexagon bolt 4 to fix upper mold core 2 under
Mold core 3.
Upper mold core 2 uses hard alloy material with lower mold core 3, is satisfied by physical performance index：84 ~ 85HRA of hardness, bending resistance
3100 ~ 3200N/mm of intensity2, cobalt magnetic 16 ~ 17%, 2 ~ 2.5 μm of granularity, A02+B00 grades of porosity, C00 grades of free charcoal element, α phases 1 ~
2, β phases 0.5 ~ 2.0, cannot there is η phases.Can also lower mold core 3 use above-mentioned material, and upper mold core 2 using traditional YG20C,
YG20 or performance make similar to the hard alloy of the trade mark, 82 ~ 85HRA of hardness of this series hard alloy, and bending strength 2200 ~
2500N/mm2, cobalt magnetic 20%, 1.2 μm or so of granularity.
Traditional high speed cold-heading nut mold has the failure of 90% ratio to appear in lower mold core, and the form of expression of failure has circle
Arc bottom selenodont pit, inner bore perimeter collapse block, the separation of upper mold core lower mold core and seamed edge abrasion, lower mold core bottom surface pockmark
Deng.Judge curved bottom crescent moon pit, the separation of upper mold core lower mold core and seamed edge abrasion, lower mold core bottom table according to failure analysis
Face pockmark may be cemented carbide material mechanical property problem, it is also possible to be process issues.Interior sky periphery collapses block only
It can be cemented carbide material mechanical property problem.
According to failure analysis and tens of Experimental Comparisons, YG20, YG20C or property that traditional molding die is selected are determined
Can the hard alloy of the similar trade mark there are bending strengths that low, granularity is partially thin, voidage rank is higher, carbide rank is unstable etc.
Defect.The final above-mentioned physical performance index for determining hard alloy（Material composition and technique are grasped by hard alloy producer, are met
Mechanical property）, processing technology and performance through testing hard alloy reach expected requirement.
In the present embodiment, the processing method of high speed nut molding machine nut stroke mould includes the following steps：Formwork makes
→ mold core making → formwork is with mold core with mill group die face taper → electric spark high current machining center seat → group mould（Intrusion 2.5 ~
3mm）Four molding → polishing → labels of → electric spark → inspection storage.
Key step is briefly described below.Formwork making includes vehicle hole, milling side, heat treatment, cylindrical grinding, grinding out etc.
Step.Mold core making includes cylindrical grinding, grinds endoporus.As shown in figure 5, formwork is formwork with mill group die face taper with mold core
With upper and lower mold core by computer controlled grinding machine 5, processing is ground using same set of grinding clamp and angle.Grinding clamp includes solid
Reservation（It is not drawn into）And it is rotatably mounted to the scroll chuck 6 in fixed seat（May be other clamping devices）, three-jaw card
Disk 6 can be relatively fixed 5 degree of a transverse rotation（As indicated by the arrows in the figure）, it is rotated in conjunction with scroll chuck 6 itself, it can be in formwork endoporus
Grind 5 degree（A meanings angle in figure）Taper, upper and lower mold core peripheral milling goes out 5 degree of taper.As shown in fig. 6, electric spark high current
Machining center seat is to be packed into upper mold core in the endoporus of formwork, the carry out roughing to the endoporus of upper mold core.Group mould is will be upper and lower
Mold core and interior regular hexagon bolt are fitted into formwork endoporus, and it is 2.5 ~ 3mm that upper mold core, which carries out intrusion,（H meanings ruler in figure
It is very little）Compression molding operation.As shown in fig. 7, four moldings of electric spark are to carry out four electrical discharge machinings, each electricity to upper and lower mold core
Pole, electric current, equipment are all had any different.Electrode shape is respectively regular hexagonal section+end cylinder, regular hexagonal section+end
Chamfering, regular hexagonal section+end chamfering, cylinder（Respectively as shown in Fig. 8,9,10,11）, size is respectively 17.35mm（Just
Hexagon opposite side size）、17.3mm、17.35mm、13.8mm.The electric current of four processing successively decreases step by step from 14A ~ 6A.It is preceding electric three times
Spark processing is equivalent to roughing and semifinishing, and the 4th time electrical discharge machining is equivalent to finishing.
The processing route of traditional molding die is：Formwork making → mold core cylindrical grinding, mill endoporus → group mould（Intrusion 2 ~
4mm）→ electric spark one-pass molding → polishing → label → inspection storage, according to failure analysis and Experimental Comparison, upper mold core, lower die
Core detaches and the failure modes such as seamed edge abrasion, lower mold core bottom surface pockmark, curved bottom crescent moon pit and processing technology have
Much relations, upper mold core, lower mold core separation and seamed edge abrasion belong to pressing mold and cause defect, lower mold core bottom surface pockmark, circular arc
Bottom crescent moon pit is likely to be defect caused by edm forming.
In the present embodiment, formwork and mold core with mill group die face taper be same equipment, using same fixture and angle into
Capable processing, the advantageous angle that ensure that group die face and precision consistency, group die face contact for complete face, the friction of generation
Power increases considerably, and in addition formwork increases the compression of mold core, and the fatigue life value of mold increases substantially.The present invention's adds
In work technique, while the pressing mold amount of group mould is controlled more accurate, the optimum value of pressing mold amount is controlled in 2.5 ~ 3mm, favorably
Reduce die life scattered error.
In the present embodiment, the molding of electric spark four times be increased on the basis of traditional electric spark one-pass molding three times at
Type, different number edm formings choosings use at the time of molding electrode, electric current, equipment are all had any different, preceding electrical discharge machining three times
It is equivalent to roughing and semifinishing, the 4th time electrical discharge machining is equivalent to finishing.The shape of processing electrode used therein, ruler every time
It is very little different（It is specifically shown in attached drawing）, four times the electric current processed successively decreases step by step from 14A ~ 6A.Four moulding process production of electric spark
The mold bore area gone out eliminates the defects of carbon distribution generated in traditional electrical discharge machining, spot corrosion, carbide scaling loss.
It is proved through test of many times, the high speed cold-heading screw nut die of selection and processing and manufacturing is carried out by the present embodiment uses the longevity
Life>1000h, average life span>900h.
Claims (7)
1. a kind of high speed nut molding machine nut stroke mould lower mold core, which is characterized in that material is to meet following physical property
The hard alloy of index：84 ~ 85HRA of hardness, 3100 ~ 3200N/mm of bending strength2, cobalt magnetic 16 ~ 17%, 2 ~ 2.5 μm of granularity, hole
A02+B00 grades of porosity, C00 grades of free charcoal element, α phases 1 ~ 2, β phases 0.5 ~ 2.0 cannot have η phases.
2. a kind of high speed nut molding machine nut stroke mould, includes stroke formwork with formwork endoporus and be fixedly installed in
Upper mold core, lower mold core in formwork endoporus, which is characterized in that lower mold core is closed using the hard for meeting following physical performance index
Gold：84 ~ 85HRA of hardness, 3100 ~ 3200N/mm of bending strength2, cobalt magnetic 16 ~ 17%, 2 ~ 2.5 μm of granularity, porosity A02+B00
Grade, C00 grades of free charcoal element, α phases 1 ~ 2, β phases 0.5 ~ 2.0 cannot have η phases.
3. nut stroke mould according to claim 2, which is characterized in that upper mold core, which uses, meets following physical performance index
Hard alloy：84 ~ 85HRA of hardness, 3100 ~ 3200N/mm of bending strength2, cobalt magnetic 16 ~ 17%, 2 ~ 2.5 μm of granularity, porosity
A02+B00 grades, C00 grades of free charcoal element, α phases 1 ~ 2, β phases 0.5 ~ 2.0 cannot have η phases.
4. nut stroke mould according to claim 2, which is characterized in that upper mold core, which uses, meets following physical performance index
Hard alloy：82 ~ 85HRA of hardness, 2200 ~ 2500N/mm of bending strength2, cobalt magnetic 20%, 1.2 μm of granularity.
5. nut stroke mould according to claim 2, which is characterized in that further include for fixing upper mold core and lower mold core
Retaining element.
6. nut stroke mould according to claim 5, which is characterized in that the retaining element is interior regular hexagon bolt,
Coordinate with the threaded hole of formwork endoporus lower part and fixes.
7. nut stroke mould according to claim 2, which is characterized in that upper mold core is dry by compression molding operation and formwork endoporus
Cooperation is related to, intrusion is 2.5 ~ 3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711461663.3A CN108296404A (en) | 2017-12-29 | 2017-12-29 | A kind of high speed nut molding machine nut stroke mould and its lower mold core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711461663.3A CN108296404A (en) | 2017-12-29 | 2017-12-29 | A kind of high speed nut molding machine nut stroke mould and its lower mold core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108296404A true CN108296404A (en) | 2018-07-20 |
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ID=62867595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711461663.3A Pending CN108296404A (en) | 2017-12-29 | 2017-12-29 | A kind of high speed nut molding machine nut stroke mould and its lower mold core |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102409215B (en) * | 2011-11-07 | 2013-05-22 | 西南大学 | Superfine hard alloy for cutter with large cutting amount |
| CN103667844A (en) * | 2013-12-31 | 2014-03-26 | 株洲硬质合金集团有限公司 | Hard alloy for low-load high-speed punching precision mold and preparation method thereof |
| CN104561722A (en) * | 2015-01-14 | 2015-04-29 | 长沙成旭新材料有限公司 | Hard alloy |
| CN105671399A (en) * | 2014-11-21 | 2016-06-15 | 河南省大地合金股份有限公司 | Hard alloy low in sintering temperature |
| CN106180516A (en) * | 2016-07-13 | 2016-12-07 | 江苏东顺新能源科技有限公司 | A kind of bucket tooth crown forging die |
| CN106319318A (en) * | 2015-06-26 | 2017-01-11 | 姜蕾 | Hard alloy |
| CN206153478U (en) * | 2016-08-25 | 2017-05-10 | 厦门同恒金属有限公司 | Cold forging die of shaping major part rodlet class part |
-
2017
- 2017-12-29 CN CN201711461663.3A patent/CN108296404A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102409215B (en) * | 2011-11-07 | 2013-05-22 | 西南大学 | Superfine hard alloy for cutter with large cutting amount |
| CN103667844A (en) * | 2013-12-31 | 2014-03-26 | 株洲硬质合金集团有限公司 | Hard alloy for low-load high-speed punching precision mold and preparation method thereof |
| CN105671399A (en) * | 2014-11-21 | 2016-06-15 | 河南省大地合金股份有限公司 | Hard alloy low in sintering temperature |
| CN104561722A (en) * | 2015-01-14 | 2015-04-29 | 长沙成旭新材料有限公司 | Hard alloy |
| CN106319318A (en) * | 2015-06-26 | 2017-01-11 | 姜蕾 | Hard alloy |
| CN106180516A (en) * | 2016-07-13 | 2016-12-07 | 江苏东顺新能源科技有限公司 | A kind of bucket tooth crown forging die |
| CN206153478U (en) * | 2016-08-25 | 2017-05-10 | 厦门同恒金属有限公司 | Cold forging die of shaping major part rodlet class part |
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| PB01 | Publication | ||
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Application publication date: 20180720 |