CN1256199C - Metal plate punching and inner extruding reinforcing process - Google Patents
Metal plate punching and inner extruding reinforcing process Download PDFInfo
- Publication number
- CN1256199C CN1256199C CN 03125224 CN03125224A CN1256199C CN 1256199 C CN1256199 C CN 1256199C CN 03125224 CN03125224 CN 03125224 CN 03125224 A CN03125224 A CN 03125224A CN 1256199 C CN1256199 C CN 1256199C
- Authority
- CN
- China
- Prior art keywords
- extrusion
- inner edge
- punch
- punching
- sheet metal
- 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.)
- Expired - Lifetime
Links
Images
Landscapes
- Punching Or Piercing (AREA)
- Forging (AREA)
Abstract
The present invention relates to inner edge punching and extrusion strengthening technology for metal plates, which is a technology method using special punching extruding male mould to punch and extrude the inner edges of the metal plates by one step and realizing punching, dimension correction and extrusion strengthening by one working step. For a punching structural member which has surplus in rigidity and parts which is provided with inner edge blanking faces, such as punched holes, etc., in dangerous positions, the fatigue strength is greatly improved through inner edge extrusion and strengthening. If the strength is unchanged, the plate thickness of the punching structural member can be thinned, which largely exists in automobile and industrial products. The present invention is applied to have great economical benefits, and has wide application prospect.
Description
Technical field: the present invention relates to a kind of metallic plate punching and inner edge extrusion hardening.
Background technology: the metallic plate punching process technology is widely used in each industrial departments such as automobile, aircraft, electrical equipment, instrument, and its feature has: production efficiency height, production cost be low, can obtain the unmanageable complicated shape part of other processing method.Automobile is generally blanking → punching → brake forming with the typical Sheet Metal Forming Technology of punching structure spare grooved crossbeam.Near the connecting hole hole wall of dangerouse cross-section is because stress concentration effect becomes the weak part of part fatigue rupture to the grooved crossbeam in use, if hole wall is strengthened, the fatigue strength of part will be improved.It is that cold extrusion is strengthened that the method that hole wall is strengthened is used maximum, and the high situation of carrying generally doubles above following fatigue life, better effects if during low carrying.Along with the extensive use of high-strength steel sheet, endoporus cold extrusion strengthening effect is all the more obvious.Traditional cold extrusion reinforcement process is generally machined holes → extruding to be strengthened, and this method cost height, efficient are low, can not satisfy requirement of mass production.The hole dimension precision that the common punch press of single action is gone out is too poor can't directly push, the endoporus that can not had burr and the satisfied extruding requirement of dimensional accuracy with no burr fine blanking technology up and down, but can't finish extruding in a punching stroke strengthens, need add one extruding in addition and strengthen operation, and do not have the burr fine blanking technology and need double action press and Fine punching die frame or fine press, this scheme is owing to needing the tooling device of complex and expensive, so can't be widely used.
Summary of the invention: the present invention is low in order to solve traditional cold extrusion reinforcement process cost height, efficient, can not satisfy the problem of requirement of mass production, punching press of a kind of sheet metal inner edge and extrusion hardening are proposed, this technology is to adopt special-purpose impact extrusion punch that sheet metal is carried out inner edge one step impact extrusion, realizes the process that punching, size finishing and extruding are strengthened with a work step.This punch comprises common stamping mould, cutting push broach, three working portions of extruding plug.
Surplus is arranged and dangerous position has the part of inner edge stamping-out faces such as punching for the rigidity of punching structure spare, the inner edge extruding is strengthened can increase substantially fatigue strength.If keep intensity constant, the thickness of slab of stamping parts can attenuate, and this class situation exists on automobile and industrial products in a large number, and the application of this technology can produce huge economic benefit, has broad application prospects.
Description of drawings: Fig. 1 is the punch structure schematic diagram of inner edge one step impact extrusion circular hole technology of the present invention;
Fig. 2 is the punch assembly structure schematic diagram of inner edge one step impact extrusion circular hole technology of the present invention.
The specific embodiment: sheet metal inner edge of the present invention punching press and extrusion hardening, can on common punch press, adopt special-purpose impact extrusion punch that the sheet metal inner edge is carried out a step impact extrusion, realize the process that punching, size finishing and extruding are strengthened with a work step.This technology only needs the common punch press of single action to realize, is applicable to the upgrading of old Sheet Metal Forming Technology.Its stamping-out inner edge can reach IT5～IT7 through finishing extruding back size and form accuracy, and surface roughness can reach Ra=0.4～1.6, and working (machining) efficiency is identical with punching.Is example with automobile with punching press grooved crossbeam, changes original production technology, changes near the connecting hole the crossbeam dangerouse cross-section into impact extrusion by punching and strengthens processing, and fatigue strength will increase substantially after the spares bend moulding, can cancel limit, hole deburring operation simultaneously.When the crossbeam material is the A3 steel plate (σ of supply of material state
b=416MPa, σ
0.2=235Mpa, σ
0.2/ σ
b=0.56), relative amount of compression 2.5%, proof stress 0.65 σ
b(270MPa), increase by 1.8 times fatigue life.Proof stress reduces back amplification fatigue life greater than Gao Zaiqu.If the novel high-strength steel plate, along with the increase of tensile strength and yield tensile ratio, can increase more than 2 times fatigue life.The automobile beam class that consumption is very big uses heat bundle titaniferous steel plate its tensile strength of T52 and yield tensile ratio obviously greater than A3 steel plate (σ
b=567MPa, σ
0.2/ σ
b=0.78), this explanation extruding is strengthened very big in the potentiality of automobile industry.Because the size of a step impact extrusion technology and form accuracy much larger than common punching, can be used interference engagement and connect (bolt or riveted joint) this moment, extruding adds amplification fatigue life of interfering complex intensifying to connect and can reach more than 2 times.Hole wall weak part on some stamping parts is relatively-stationary, as be subjected to the connecting hole of curved grooved crossbeam, hole wall is relatively weaker near crossbeam position longitudinally, in order to improve relative amount of compression and then to increase strengthening effect or reduce the punch withdrawal force, the weak part that can only push hole wall promptly with the both sides hole wall of crossbeam parallel longitudinal.
This special use inner edge one step impact extrusion punch can be used for multiple operation combination compound die and multiple operation combination stage progressive die, and punch comprises three parts: perforating die partly is punch and first working portion that sheet material at first contacts, and is the common stamping mould; Trim part is second working portion of punch, is the cutting push broach, and the inner edge inclination burr processing that is used for going out is trimmed to and is fit to the extruding reinforcement; Crimping section is the 3rd working portion of punch, is the extruding plug, and required size, shape and fineness are strengthened and formed in the extruding that is used for inner edge.Can realize the impact extrusion processing of one step of sheet material with this punch.
Be that example is illustrated with common guide pillar blanking die impact extrusion circular hole now, principle is identical when being used for other occasion.As shown in Figure 1, inner edge one step impact extrusion circular hole punch comprises perforating die 1, cutting push broach 3, extruding plug 6.The diameter of phi d1 of perforating die has determined the blanking gap, and reasonably the blanking gap is influenced by material property and sheet metal thickness, and it determines that method sees various " stamping technology handbook and standards " blade clearance JB/Z 271-1986 ".The compression distance of the relative sheet material of punch when punch-die cutting edge crackle met when the length L 1 of perforating die part should be greater than the sheet material stamping-out, given various handbook standards when concrete numeric reference is determined the blanking gap.Because the active length of inner edge one step impact extrusion punch is longer, in order to improve punch rigidity, reduces the length L 1 of perforating die part as far as possible.The chipping allowance of push broaching diameter of phi d2 is generally about 0.1mm, and is sharp and hold smear metal for the cutting edge that guarantees to grind, and chip pocket 2 is arranged before cutting edge; The forward and backward angle of cutting edge should be adjusted according to different materials and hardness.When the thickness of pressing sheet material is big, can increase the push broach number of teeth, about rise per tooth 0.1mm.Should set up chip dividing groove if the number of teeth is more.The push broach detailed design can be with reference to the Tool Design handbook.Hard steel about thickness of slab 4mm is general only to need a cutting edge to get final product.The length L 2 of trim part generally slightly is longer than thickness of slab, pushes after promptly finishing cutting again.The 5 smooth connections of extruding cambered surface up and down that extruding plug 6 is coupled.Push the bottom that cambered surface 5 is seated in escape 4 up and down, actual extruding faying face must not contact escape 4 bottoms.Surface roughness Ra=0.1～0.2 of extruding cambered surface 5 and plug 6 outer surfaces, monolateral amount of compression is 0.04～0.06mm.In order to increase amount of compression and then to improve strengthening effect, multistage extruding boss can be set, the monolateral amount of compression of every grade of boss is 0.04～0.06mm.Extruding active length L3 is about 2mm.L4 slightly is longer than thickness of slab and gets final product.In order to improve punch rigidity, inner edge one step impact extrusion punch can be set up punch bearing-surface Φ d4, and mating surface is relative slides for punch Φ d4 face and supporting during impact extrusion, supporting punch and play the effect of raising punch lateral rigidity.In impact extrusion mould shown in Figure 2, the punch bearing-surface cooperates with hole on the guide plate 14, slides relatively during impact extrusion, plays the effect of supporting punch 12.Inner edge one step impact extrusion process is as follows, and the punch press pressure head drives cope match-plate pattern 16 and moves down, and the stripper 13 on the guide plate 14 compresses sheet material 11, and punch 12 carries out punching, repaiies the hole, squeezes the hole then.When the punch press pressure head moved to the top dead centre direction, dish spring 15 promotion strippers 13 pushed away extruding punch 12 with sheet material 11 and finish discharging.Extruding plug 6 enters and by behind sheet material 11 circular holes, Circularhole diameter is because resilience will be less than extruding plug diameter of phi d3, and dish spring 15 thrusts only could be released plate 11 greater than plug 6 reverse extruding forces.The centering of punch 12 and die 9 when guiding impact extrusion mould should guarantee punching press, its axiality franchise is Φ 0.005mm.The definite of die 9 diameter should guarantee that the hole can obtain least material condition and get final product.The gap of extruding plug diameter of phi d3 and die 9 is 0.01～0.03mm.It is HRC58～62 that punch 12 materials are recommended to select high-speed steel such as W18Gr4V, hardness for use.The maximum difference of one step of guide colume type impact extrusion mould and other punch die is that punching stroke is longer, and the rigidity of punch is lower, should reduce the length of punch each several part as far as possible, can adopt the way of setting up the punch bearing-surface to improve lateral rigidity if desired.The other parts of inner edge one step impact extrusion mould are basic identical with general punch die.
Surplus is arranged and dangerous position has the part of inner edge stamping-out faces such as punching for the rigidity of punching structure spare, the inner edge extruding is strengthened can increase substantially fatigue strength.If keep intensity constant, the thickness of slab of stamping parts can attenuate, and this class situation exists on automobile and industrial products in a large number, and the application of this technology can produce huge economic benefit, has broad application prospects.
Claims (5)
1, punching press of a kind of sheet metal inner edge and extrusion hardening, this technology are to adopt special-purpose impact extrusion punch that sheet metal is carried out inner edge one step impact extrusion, realize the process that punching, size finishing and extruding are strengthened with a work step; Described special-purpose impact extrusion punch is a multiple operation combination compound die, comprises the perforating die part that at first contacts with sheet material, the trim part of cutting push broach formation and the crimping section of extrusion die bar construction, and described cutting push broach has chip pocket before cutting edge.
2, sheet metal inner edge as claimed in claim 1 punching press and extrusion hardening is characterized in that: the described cutting push broach number of teeth is more than one.
3, sheet metal inner edge as claimed in claim 1 punching press and extrusion hardening is characterized in that: described extruding plug is provided with more than one and pushes boss, and the monolateral amount of compression of every grade of boss is 0.04～0.06mm.
4, sheet metal inner edge as claimed in claim 1 punching press and extrusion hardening is characterized in that: described special-purpose impact extrusion punch has additional the punch bearing-surface, and mating surface is relative slides with supporting for the punch supporting surface during impact extrusion.
5, sheet metal inner edge as claimed in claim 1 punching press and extrusion hardening is characterized in that: the fit clearance of described extruding plug and die is 0.01～0.03mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03125224 CN1256199C (en) | 2003-08-01 | 2003-08-01 | Metal plate punching and inner extruding reinforcing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03125224 CN1256199C (en) | 2003-08-01 | 2003-08-01 | Metal plate punching and inner extruding reinforcing process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1486803A CN1486803A (en) | 2004-04-07 |
| CN1256199C true CN1256199C (en) | 2006-05-17 |
Family
ID=34152971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03125224 Expired - Lifetime CN1256199C (en) | 2003-08-01 | 2003-08-01 | Metal plate punching and inner extruding reinforcing process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1256199C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103707038A (en) * | 2013-12-10 | 2014-04-09 | 中国航空工业集团公司北京航空材料研究院 | Device for maintaining and interfering joint |
| CN105855790B (en) * | 2015-01-19 | 2019-01-08 | 中国科学院沈阳自动化研究所 | A kind of friction and Extrusion reinforcing tool and method of structural member connecting hole |
| CN105855791B (en) * | 2015-01-19 | 2018-12-25 | 中国科学院沈阳自动化研究所 | A kind of friction and Extrusion intensifying method of structural member connecting hole |
| CN109500219A (en) * | 2018-12-18 | 2019-03-22 | 常州工利精机科技有限公司 | A kind of hole class blanking die and hole class blanking method |
-
2003
- 2003-08-01 CN CN 03125224 patent/CN1256199C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1486803A (en) | 2004-04-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10022770B2 (en) | Method and tool for precision cutting | |
| KR101488019B1 (en) | Method and device for the production of a stamping with enlarged functional surface | |
| GB1559186A (en) | Method of fabricating a bifurcated part of a cardan joint joint and apparatus for the performance thereof | |
| CN101249524B (en) | Device for wedge pressure forming process gear | |
| CN219851921U (en) | Spherical trailer hook forging and pressing forming device convenient to material loading | |
| CN102935578A (en) | Method for manufacturing local boss nut plate by high-intensity biphase steel plate | |
| CN101918158B (en) | Method of manufacturing metal member with plurality of projections | |
| CN1256199C (en) | Metal plate punching and inner extruding reinforcing process | |
| CN112756538B (en) | Near-net forming die and forming method for hinge beam forging of fine steel stone pressure equipment | |
| EP2868402B1 (en) | Fine blanking device | |
| CN100333852C (en) | Precise punch technology for manufacturing circular or sectorial gear | |
| CN1273238C (en) | Cylindric push-cutting and edging composite tool for cutting and punching | |
| CN201353616Y (en) | Thermoforming, punching and trimming integrated die of high-strength steel elements | |
| US20120234070A1 (en) | Method of Drawing a Blank by Preforming a Channel in a Preform that is Subsequently Drawn into a Die Cavity | |
| CN216150794U (en) | Smooth no burr metal machining mould in surface | |
| CN214442739U (en) | Near-net forming die for forging hinge beam of refined steel stone pressure equipment | |
| CN212350074U (en) | Fine blanking forming die for double-layer boss | |
| Rao et al. | Modelling, Analysis and Development of Progressive Die for Seat Rail | |
| CN2860657Y (en) | Punching die for groove shape workpiece | |
| CN2481442Y (en) | Straight-toothed gear rolling and extrusion combined precision forming device | |
| CN1207124C (en) | Combined straight-gear rolling and extruding finish formation equipment and technological process | |
| US3000251A (en) | Die and method of making same | |
| CN213378737U (en) | Die for trimming and punching outer plate of front longitudinal beam of floor of heavy truck cab | |
| CN217964329U (en) | Hydraulic blanking device and busbar composite machining center | |
| KR100307100B1 (en) | A method for manufacturing a cylinder head washer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20060517 |
|
| CX01 | Expiry of patent term |