CN107571335A - Carbon fibre composite diplopore connector punch-forming mold and system - Google Patents

Abstract

The invention discloses carbon fibre composite diplopore connector punch-forming mold and system, and it solves the problems, such as that Cutter wear is big in the prior art, has and is easy to punch process, Reducing distortion, reduces the caused beneficial effect of flash, and its scheme is as follows：Upper mould includes upper bolster, is detachably connected with forcing press；Punch retainer, located at upper bolster lower surface, it is provided with some through holes；An at least row is used for the piercing punch of stamping inner aperture, and piercing punch lower surface carries two punching projections, and piercing punch is set through the through hole of punch retainer, and same row's blanking punch undulate is set；An at least row is used for the blanking punch of stamping outline, and blanking punch is set through the through hole of punch retainer, and same row's blanking punch undulate is set.

Description

Carbon fibre composite diplopore connector punch-forming mold and system

Technical field

The present invention relates to pressure processing field, more particularly to carbon fibre composite diplopore connector punch-forming mold and System.

Background technology

In recent years, carbon fibre material meets that market proposes certain requirement to the characteristic of material, therefore, using carbon fiber material Material turns into a kind of trend.Carbon fiber is mainly a kind of special fibre being made up of carbon, and its phosphorus content is different and different with species, Typically more than 90%.Carbon fibre composite high temperature resistant, abrasion-resistant, conduction, heat conduction and corrosion-resistant etc., but with general carbon material Unlike material, its profile has significant anisotropy, and lay-up orientations can be adjusted in very wide scope；Softness, it can add Work shows very high intensity along fiber direction of principal axis into various fabrics；Anti-seismic performance is good, has higher intrinsic frequency, simultaneously Composite collective fiber interface has the ability of larger absorption vibration energy, thus the damping of material is higher；Carbon fiber Axial strength and modulus are high, no creep, good stability of the dimension；Fatigue durability is good, and specific heat and electric conductivity are between nonmetallic and metal Between, thermal coefficient of expansion is small, good corrosion resistance；The density of fiber is low, light weight, and X-ray transparent is good；With good temperature sensitive Property；But its impact resistance is poor, easily damage, strong acid effect under aoxidize, with can occur during metal composite metallic carbide, Carburizing and electrochemical corrosion phenomenon.At present, carbon fibre composite is of wide application general, such as：CFRP is big on big aircraft Amount application can be such that its own quality mitigates significantly, can be effectively increased voyage or payload.And invisbile plane stealth can be improved Energy；Carbon fibre composite is applied to neckpillow, including neckpillow skeleton, skeleton lining and skeleton sheath, and it is compound using carbon fiber Material is fabricated to the skeleton of neckpillow so that overall structure is light, comfortable, effective；Deepwater oilfield is for that can bear harsh ocean The demand of weather constantly expands, therefore carbon fiber is widely used in deepwater field exploitation；In Nonwoven Equipment Carding machine, cross lapping machine, up- coiler etc., carbon fiber is also widely applied.

Meanwhile carbon fibre composite is a kind of difficult machining material, its fragility is big, hardness is high, easy during processing There is the problems such as layering, tear, burr.Carbon fibre composite is big by the soft and tough matrix of matter and intensity height, hardness The two-phase that mixes of fiber or heterogeneous structure, its mechanical property be in anisotropy, machine-sensible conditions are more severe, and carbon is fine The main feature for tieing up composite machining is as follows：

(1) material is also easy to produce delamination failure.Layering is degumming and a kind of breakoff phenomenon for being formed between composite plys, It can make interlayer stress excessive when cutting parameter is unreasonable and cause to be layered, the performance that layering can seriously reduce material even makes zero Part is scrapped, even small layering and very serious potential safety hazard.

(2) tool wear is serious, durability is low.Cutting region temperature is high and concentrates on tool in cutting sword very narrow region nearby Interior, the resilience of fiber and the chip of powdery have aggravated scratch cutting edge and rear knife face again, and the hardness of carbon fiber is very high in addition, therefore Tool wear is serious, and rear knife face produces trench abrasion, and durability is low.

(3) residual stress is produced.The dimensional accuracy and surface roughness on surface are not easy to reach requirement, easily produce remaining answer Power.This is primarily due to that cutting temperature is higher, and the thermal coefficient of expansion difference of reinforcing fiber and matrix resin is too big.Due to composite wood Anisotropy is presented in material, and interlaminar strength is low, during cutting layering, tear are easily produced in the presence of cutting force the defects of, drilling When be particularly acute, crudy is difficult to ensure that.

(4) cutting temperature is high.Carbon fibre composite chip forming procedure is that a matrix destroys and fibrous fracture is mutual The complex process of intertexture, in the process, carbon fiber continuously wear away cutter as cutting Hard Inclusion, because of carbon fiber fracture and matrix Shearing, and friction between chip and rake face, rear knife face and machined surface and produce substantial amounts of cutting heat, carbon is fine in addition Reason, the cutting heats such as dimension composite poor thermal conductivity are mainly transmitted to cutter and workpiece, cause the Fast Wearing of cutter.

Through retrieval, Patent No. ZL2015202447490 discloses the structure of its practical Novel progressive die, and the progressive die The characteristics of.Progressive die ram efficiency is high, and safe operation is simple, and die life length, it can complete the whole of product shaping Process, overcome operation inconvenience and accumulated error that simple mould multiple bearing is brought.With progressive die rapidoprint, can reduce Production cost, improve the production efficiency, quality and precision of product.

Through retrieval, it is excellent that patent No. ZL201610191125.6 discloses a kind of multi-station progressive die mould precursor structure topology Change method, according to the punch-die structural element beyond mould parent, determine the optimization region of parent.Using finite element method Numerical simulation is carried out to separation circuit, obtains the stress of mould in punching course.Mould precursor structure is entered based on density variable method Row topological optimization, and mould parent is designed according to optimum results and examines whether set mould meets deformation constraint bar Part.The invention can improve the stability of mold stiffness and stamping parts stamping quality, reduce mould structure deformation to stamping parts matter The influence of amount, the number that repairs a die is reduced, mitigate mold weight, shorten mould manufacturing cycle, reduce processing cost.

Through retrieval, when Patent No. 2016109128476 studies carbon fiber, be mentioned to carbon fiber have it is stronger it is acidproof, Alkaline-resisting, corrosion-resistant, anti abrasive feature, it can apply and make gasket seal.

In summary, from the point of view of the document of retrieval, it is known that technology is not all carried out to this anisotropic material of carbon fiber Pressure processing, particularly carbon fibre composite diplopore connector punch forming, according to current processing mode, machining carbon Fibrous composite is not easy to ensure the contour surface precision of part, high processing costs, and larger to tool damage.

The content of the invention

For overcome the deficiencies in the prior art, the invention provides in carbon fibre composite diplopore connector punch forming Mould, mould can realize that carbon fiber diplopore is molded on this, reduce the impact to punch-pin and upper bolster, be cut with punch process substitution is traditional Processing is cut, carbon fibre material is processed, so as to the quality, precision and the production that reduce the production cost of product, improve product Efficiency..

The concrete scheme of mould is as follows in carbon fibre composite diplopore connector punch forming：

Mould in carbon fibre composite diplopore connector punch forming, including：

Upper bolster, it is detachably connected with forcing press；

Punch retainer, located at upper bolster lower surface, is provided with some through holes, and damage is conveniently replaced by the setting of through hole Punch-pin；

An at least row is used for the piercing punch of stamping inner aperture, and piercing punch lower surface carries two punching convexes Rise, piercing punch is set through the through hole of punch retainer, and same row's piercing punch undulate is set；

An at least row is used for the blanking punch of stamping outline, and blanking punch is set through the through hole of punch retainer Put, and same row's blanking punch undulate is set, blanking punch is located at piercing punch rear.

On this in mould, on each comfortable same level straight line of Origin And Destination of piercing punch and blanking punch, in wave The distance between the piercing punch of shape or longitudinal summit of blanking punch are with challengeing by oneself between corrugated peak and minimum point Distance can be adjusted as needed, such setting, punch member lateral separation is constant, longitudinally uniformly arrange, make It is as scattered as possible to obtain being arranged in allowed band for punch-pin, is not only convenient for punch process, Reducing distortion, reduces the generation of flash, And punch and matrix is simple to manufacture conveniently, processing cost is reduced, reduces the generation of useless part；

So set is to realize under conditions of reasonable punching press gap and the certain machining accuracy of guarantee so that material Utilization rate maximizes, while also has higher processing efficiency.

Further, the upper bolster is provided with perforate, and die shank is set in perforate, and die shank includes bottom plate and set from bottom plate protrusion The connecting shaft put, die shank are connected with described forcing press, and bottom plate is circle, and bottom plate is fixed by screw and upper bolster.

Further, upper mould also includes being used for cutting off the trimming punch of rim charge, trimming punch in cylinder, located at it is described fall Expect the rear of punch-pin, and pin stop be set below trimming punch, the rim charge that trimming punch props up pin stop is cut off, make plate after Continuous to advance, trimming punch is provided with two, and two trimming punch are located at secondary series and the 6th row, falls behind the blanking punch of same row 4.5 times enter away from.

Set trimming punch the reason for be in Punching Process, for prevent plate by blanking pressure effect deform, Blanking part size and dimension is influenceed, in stock layout between adjacent blanking part and blanking part and slab edge set scrap (bridge).Rushing After the completion of sanction, scrap (bridge) turns into the bar shaped waste material between holes on plate.With sheet feed, scrap (bridge) is moved to below trimming punch Pin stop at, propped up by pin stop so as to limit the distance that plate is sent into forward, reach positioning action.It is downward in trimming punch During motion, the scrap (bridge) partial cut that will can be propped up by pin stop so that plate can be sent into further along, enters Row is punched next time.

Die shank is arranged on upper bolster center, and piercing punch and the off-center position of trimming punch, piercing punch are rushed Cut out that power is big compared with trimming punch, therefore piercing punch distance center position is nearer than trimming punch, trimming blanking pressure is by punching blanking pressure An equalising torque part with to center, avoids upper bolster from producing inclination, increases the friction between guide pillar, make upper mold portion partite transport It is dynamic more steady.This designed distance same column blanking die 4.5 enter again away from, can according to actual blanking pressure distribute be adjusted.

Further, the pad for being used for preventing that blanking punch from deforming with piercing punch is provided between upper bolster and punch retainer Plate, backing plate effect are to prevent punch-pin from causing deformation and failure with upper bolster extruding in the course of the work.

Further, in blanking punch described in a row it is adjacent two row spacing for 1.5 times enter away from；

In piercing punch described in one row it is adjacent two row spacing for 1.5 times enter away from, often arrange the advanced blanking punch 3 of piercing punch Enter again away from piercing punch is in front of blanking punch.

Further, blanking punch is consistent with part outline with piercing punch, and both sides are semi-cylindrical, and punching Punch-pin is more than the size of through hole with blanking punch top dimension, and blanking punch lower surface sets alignment pin.

For overcome the deficiencies in the prior art, the invention provides carbon fibre composite diplopore connector punch forming module Tool, including lower mould, the lower mould coordinate with mould in described carbon fibre composite diplopore connector punch forming, and lower mould includes：

Die shoe, it is detachably connected with press bench；

Die block, located at die shoe upper surface, is provided with some grooves, and damage is conveniently replaced by the setting of groove Cavity plate；

The punching concave die that an at least row coordinates with the piercing punch, punching concave die are set through groove；

The blanking die that an at least row coordinates with the blanking punch, blanking die are set through groove；

Guide pillar, located at the corner of die block, to limit the moving direction of upper bolster, guide pillar is provided with four, with upper mould The corner positioning hole of seat is engaged, and for limiting the moving direction of upper bolster, improves machining accuracy, punching concave die and blanking die In be each provided with shrinkage pool, with corresponding punch-pin coordinate.

The die block sidepiece sets the charging fagging played a supporting role, so that plate horizontally advances；

Further, the stripper of limiting plate discharge position is provided in the upper surface of die block, stripper is used for Preventing from lifting with punch-pin because sheet metal deformation blocks punch-pin, stripper lower surface sets guide groove to be used to accommodate plate, and Discharging plate surface is provided with the hole consistent with blanking punch, trimming punch and piercing punch outline.

Further, the lower mould also includes trim die, and blanking die is located between trim die and punching concave die.Cut Edge die coordinates with trimming punch.

Further, limiting plate material advances initial when the stripper at least side is provided for punching plate for the first time Pin stop, initial stop pin include initial stop pin support plate and initial stop pin spring, and initial stop pin support plate is L-shaped, long side In the through hole of stripper side, initial stop pin spring one end is fixed on initial stop pin support plate short side, the other end Stripper is fixed.

For overcome the deficiencies in the prior art, present invention also offers a kind of full-automatic material-feeding system of processing, including it is described Carbon fibre composite diplopore connector punch-forming mold and feeding unit, it is continuous between the upward mould of feeding unit and lower mould Feeding；

Further, feeding unit includes the front and rear two groups of roll shafts set, and preceding group of roll shaft includes two rollers setting up and down Axle, rear roll shaft of organizing include one in upper, two three roll shafts being triangularly arranged under, wherein in preceding group of roll shaft upper roll shaft with Motor connects.

In addition, motor is stepper motor, roll shaft is supported by roll shaft seat, and rear roll shaft of organizing may include three rollers Axle, upper, two under, are triangularly arranged a roll shaft, keep plate horizontal, in addition, base is set in roll shaft seat bottom, Feeding roll parts are fixed on press bench by base, ensure that feed direction aligns with plate direction of advance in mould, For flitch through the top of arrival cavity plate after five roll shafts, the distance that flitch advances once is equal to single rectangle list in punch-pin distribution The width of member.

In the course of work, among plate first is fixed on into initial stop pin, and initial stop pin, the system of stepper motor are utilized Action use, it is double set roll feeding act on simply positioned；Using roll shaft so that plate is pressed on cavity plate, binder is realized Purpose；Subsequent forcing press starts, punch-pin work, and punch-die, which combines, completes first time punching press, and punch-pin, which first moves up, departs from carbon fiber material Material, and stripper auxiliary discharging, prevent punch-pin adhering material, are separated afterwards with carbon fibre material, the waste material in cavity plate is with material guide hole Fall into lower section and be collected, realize the effect of backgauge, one-off hole-piercing process terminates, because flitch is introduced into while punching Under blanking punch, once, then plate feeds one and entered away from rear, weight the empty effect of blanking punch again in the presence of feeding structure Multiple above-mentioned blanking process.

If setting two rows, 7 piercing punches, two blanking punches of row 7 are then：Punching realizes three pairs of punchings for the first time, second Punching realizes three pairs of punchings, and third time realizes 7 device to hole of complete punching, similarly needs to realize complete 7 diplopore connectors of blanking three times again, Six punchings are needed to realize all punch-pin work altogether, whole process needs feed mechanism feeding 5 to enter away from that is, 5 times feedings.Afterwards Punching and blanking processing can be completed simultaneously.

Wherein, the distribution mode of piercing punch and blanking punch is as follows：It is big that punch retainer is evenly divided into some grades Rectangular piece, its partitioning scheme and arrangement mode are identical with the pattern type of blanking part.Selected in first row one small Square disposes first blanking punch, and 1.5 times of the advanced first row of punch member of secondary series enter away from tertial punch member Fall behind secondary series 1.5 again to enter away from going together with first row punch member.So by that analogy, dispose blanking punch, starting punch-pin with Terminal punch-pin is located in same horizontal line, and blanking punch is integrally arranged also to be distributed into wave, and amplitude is more than Blanking Layout Wave amplitude, similarly, piercing punch unit are often gone advanced blanking punch 3 and entered again away from being uniformly distributed in before blanking punch unit. Two trimming punch be located at secondary series and the 6th row, fall behind same row blanking punch 4.5 enter again away from.

To sum up, the present apparatus is integrally arranged as two row's piercing punches, two row's blanking punches (i.e. four row's punch-pin, two row's waves Punch-pin) and row's trimming punch, common three-level punch-pin.

The system of processing by control system (PLC) control operate, can be achieved continuous automatic feed, charging it is same When, stepper motor can realize that pause acts on, so that stamping machine carries out punching press；In single punching course, stepper motor is controlling Rotatable certain angle under the control of system signal, so as to control feeding stroke.Lead in forcing press punching course with feeding unit Overtravel switch coordinates running.

In addition, the length of the piercing punch or blanking punch is calculated according to equation below：

L=H_Gu+H_Unload+H_Lead+Y

In formula：L-punch-pin length, mm；

H_Gu- punch retainer thickness, mm；

H_Unload- positive stripper thickness, mm；

H_Lead- side guide plate thickness, mm；

Y-increment, i.e. processing reconditioning quality, punch-pin are pressed into the length between distance, punch retainer and the stripper of cavity plate Spend summation；

Total blanking pressure F of upper mould_zCalculated according to equation below：

F_z=F₁+F₂+F₃

F₁=K₁F_{Fall total} F₂=nK₂F_{Fall total} F₃=K₃F_{Fall total}

F_{Fall total}=N₂F_Blanking F_Blanking=KL₂tτ_b

In formula：N₂- it is disposable blanking number；

F_Blanking- blanking pressure, N；

F_{Fall total}- total blanking pressure of blanking, N；

K-safety coefficient；

L₂The girth of-blanking part blanking, mm；

T-sheet thickness, mm；

τ_b- material shearing strength, MPa

K₁、K₂、K₃, respectively stripping force, ejecting force, head part force coefficient；

F₁、F₂、F₃Respectively stripping force, ejecting force, kicking force；

F_z- total blanking pressure.

Compared with prior art, the beneficial effects of the invention are as follows：

Inserted punch-pin is made up of free-standing punch-pin, punch retainer and backing plate in the present invention.Such a structure backing plate is main For protecting punch-pin, the percussion of punch-pin and upper bolster when reducing punching press, intensity, hardness can be used common less than punch-pin Material is processed.

Free-standing punch-pin is mainly used in punch process in the present invention, higher to requirements such as intensity, hardness, precision, can be with Using the material use electrical discharge machining of higher-strength, and alignment pin and backgauge finger setting are used, ensure the accuracy of punching press With stability.

Arrangement is realized under conditions of reasonable punching press gap and the certain machining accuracy of guarantee in the present invention so that material Expect that utilization rate maximizes, while also there is higher processing efficiency.

Brief description of the drawings

The Figure of description for forming the part of the application is used for providing further understanding of the present application, and the application's shows Meaning property embodiment and its illustrate be used for explain the application, do not form the improper restriction to the application.

Fig. 1 diplopore connector progressive die punch process system axonometric drawings

Fig. 2 diplopore connector progressive die punch process system front views

Fig. 3 diplopore connector progressive die punch process system top views

Fig. 4 replicates mould front view

Fig. 5 replicates mould ladder and cuts open front view

Fig. 6 replicates mould top view

Fig. 7 part drawings

Fig. 8 replicates shaping stock layout schematic diagram

Fig. 9 punch-pin typesetting schematic diagrames

Figure 10-a, 10-b, 10-c, 10-d, 10-e, 10-f, 10-g flow process chart

Figure 11 parts of the upper die axonometric drawing

Figure 12 parts of the upper die explosive view

Figure 13 parts of the lower die axonometric drawing

Figure 14 parts of the lower die explosive view

Figure 15 feeding roll parts axonometric drawings

Figure 16 feeding roll parts explosive views

The piercing punch left views of Figure 17 I -9

The piercing punch axonometric drawings of Figure 18 I -9

The blanking punch left views of Figure 19 I -7

The blanking punch axonometric drawings of Figure 20 I -7

Figure 21 I -1, I -2 pin stop and trimming punch left view

Figure 22 I -1, I -2 pin stop and trimming punch axonometric drawing

The punching concave die sectional views of Figure 23 II -7

The punching concave die axonometric drawings of Figure 24 II -7

The blanking die sectional views of Figure 25 II -8

The blanking die axonometric drawings of Figure 26 II -8

The trim die sectional views of Figure 27 II -9

The trim die axonometric drawings of Figure 28 II -9

The upper bolster top views of Figure 29 I -4

The punch retainer top views of Figure 30 I -3

The stripper top views of Figure 31 II -2

The die block top views of Figure 32 II -5

The die shoe top views of Figure 33 II -6

The initial stop pin schematic diagrames of Figure 34 II -11

Figure 35 blade clearances schematic diagram

The instantaneous state figure cracked in Figure 36 blanking process

Punch and matrix Blade dimensions, tolerance and the graph of a relation of blanking part size and its tolerance when Figure 37 blankings and punching

Wherein, the symbol of accompanying drawing is expressed as：

I part of the upper die：

I -1 pin stop, I -2 trimming punch, I -3 punch retainer, I -4 upper bolster, I -5 die shank, I -6 screw, I -7 blanking punch, I -8 alignment pin, I -9 piercing punch, I -10 backing plate, I -11 sunk screw

II part of the lower die：

II -1 guide pillar, II -2 stripper, II -3 charging fagging, II -4 fagging trip bolt, II -5 cavity plate are fixed Plate, II -6 die shoe, II -7 punching concave die, II -8 blanking die, II -9 trim die, II -10 screw, at the beginning of II -11 Beginning pin stop, II -12 initial stop pin support plate, II -13 initial stop pin spring

III feeding unit part

III -1 stepper motor, III -2 roll shaft seat, III -3 first travelling gear, III -4 belt wheel, III -5 belt, III -6 Roll shaft before first, roll shaft before III -7 second, III -8 second travelling gear, roll shaft after III -9 first, III -10 the 3rd driving cog Take turns, roll shaft after III -11 second, III -12 base, roll shaft after III -13 the 3rd.

IV plate.

Embodiment

It is noted that described further below is all exemplary, it is intended to provides further instruction to the application.It is unless another Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field The identical meanings of understanding.

It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.

As background technology is introduced, the deficiencies in the prior art, in order to solve technical problem as above, this Shen It please propose carbon fibre composite diplopore connector punch-forming mold and system.

In a kind of typical embodiment of the application, the invention provides carbon fibre composite diplopore connector punching press Mould, the mould include upper die and lower die, and upper mould includes herein below：

Pin stop I -1：Reach positioning action by propping up the rim charge left after above punching；

Trimming punch I -2：Coordinate with trim die II -9, the rim charge that pin stop is propped up is cut off, before continuing plate Enter；

Punch retainer I -3：Inside is provided with the through hole with punch-pin arrangement position correspondence, limits the exhaust position of punch-pin, together When be conveniently replaceable the punch-pin of damage；

Upper bolster I -4：Part of the upper die is supported, and is connected by die shank I -5 with forcing press；

Die shank I -5：It is fixed on upper bolster I -4, is connected with forcing press；

Screw I -6：Die shank I -5 is fixed on upper bolster I -4；

Blanking punch I -7：Coordinate with blanking die II -8, stamping outline is to obtain zero on the basis of punching Part；

Alignment pin I -8：Positioned at the lower section of blanking punch I -7, the hole formed with punching, which is engaged, plays positioning action；

Piercing punch I -9：Coordinate with punching concave die II -7, sheet metal blanking is gone out to two apertures of inside parts；

Backing plate I -10：Prevent punch-pin from causing deformation and failure with the extruding of upper bolster I -4 in the course of the work；

Sunk screw I -11：Punch retainer I -3, backing plate I -10 are fixed on upper bolster I -4；

Further, the part of the lower die forms and respectively act as：

Guide pillar II -1：It is engaged with I -4 four jiao of positioning hole of upper bolster, limits part of the upper die moving direction, improves processing Precision；

Stripper II -2：Limiting plate discharge position, prevent from lifting with punch-pin because sheet metal deformation blocks punch-pin；

Feed fagging II -3：Located at the sidepiece of die block II -5, in the front side of mould, play a supportive role, make plate IV horizontally advances；

Fagging trip bolt II -4：Fixed charging fagging II -3；

Die block II -5：Inside is provided with the groove with cavity plate arrangement position correspondence, limits the exhaust position of cavity plate, It is conveniently replaceable the cavity plate of damage；

Die shoe II -6：Part of the lower die is supported, is fixed on press bench；

Punching concave die II -7：Coordinate with piercing punch I -9, sheet metal blanking is gone out to two apertures of inside parts；

Blanking die II -8：Coordinate with blanking punch I -7, stamping outline is to obtain zero on the basis of punching Part；

Trim die II -9：Coordinate with trimming punch I -2, the rim charge that pin stop I -1 is propped up is cut off, make plate after It is continuous to advance；

Screw II -10：Stripper II -2, die block II -5 and die shoe II -6 are fixed together；

Initial stop pin II -11：It is made up of initial stop pin support plate II -12 and initial stop pin spring II -13, Limiting plate material progressive position during punching plate for the first time；

Further, described upper bolster I -4, punch retainer I -3, stripper II -2, die block II -5 It is parallel to each other, and is connected between each other by guide pillar in the horizontal direction；Described cavity plate is arranged on die block II -5 It is and relative with described punch-pin；In the top of described cavity plate stripper is fixed with bolt.

The determination of parameter：

According to blanking part produce of large quantities, stock utilization require high, blanking part form accuracy requirement compared with it is high, flash is few The characteristics of and diplopore connector the condition such as thickness, consult《Diel application manual》The edge-lapped value of T300 carbon fibers can be looked into A, outer edge-lapped value a1.If the ungratified requirement of stock layout edge-lapped value, easily cause material deformation and failure, and should in design Problem is fabricated in view of punch-pin.

Because the size of punch-pin is smaller, so stripper has the function that to protect punch-pin and is oriented to simultaneously.For convenience more Change, punch design is selected into cold work die steel (C into block insert type structure, material_r12MoV), fixed using by screw, alignment pin is fixed Position.Strip width, thickness are actual conditions that can be according to required diplopore connector and quantity selection, and material is that T300 carbon is fine Dimension, it is desirable to which the chamfering that punching production goes out is small as far as possible, therefore blanking part precision takes IT7 levels, and Making mold precision takes IT5~IT6 Level.According to《Diel application manual》Processing carbon fiber T300 scrap (bridge) a, a1 can be consulted.According to the conditions such as material thickness, punching Cut out the surface roughness R of the section of part_aTake appropriate value.The critical shape of punching is a diameter of d_ApertureCircle, processing difficulties exist The fillet of workpiece is small as far as possible after processing is made.

One is entered and is away from interior stock utilization η 1：

The area of A-mono- blanking part, mm2；

N-mono- enters away from interior blanking part quantity；

B-billot width, mm；

S-enter away from mm.

The total stock utilization η of monoblock plate is：

The area of A-mono- blanking part, mm2；

N-mono- enters away from interior blanking part quantity；

B-billot width, mm；

L-plate length, mm.

Gap width Z：

In formula：Z-double-faced clearance value, mm；

T-sheet thickness, mm；

h₀- when cracking punch-pin press-in material depth, mm；

- when cracking punch-pin press-in material relative depth, mm；

The angle of β-shear fracture line and vertical line.

From formula (2-1) as can be seen that rational gap width Z and material thickness t, relative compression distanceCut direction of check (angle) β is relevant.Andβ is again relevant with the property of material, therefore the principal element for influenceing gap width is the property and material of material Expect thickness because consult carbon fiber T300 belongs to hard steel.

The size of punch-pin determines the size in aperture during punching, perforating die using punch-pin as design basis.First determine punch-pin Blade dimensions, the Blade dimensions of cavity plate are determined further according to gap width.Because punch and matrix occurs that abrasion is existing in use As the cutting edge abrasion of punch-pin can make punching aperture size diminish, and the abrasion of cutting edge of die can increase the size of blank.Therefore set When counting this mould, the basic size of punch-pin Blade dimensions should take the size as larger as possible within the margin of tolerance.Thus It can guarantee that punch and matrix remains able to be punched out qualified workpiece within a period of time that is worn.

This mold design is because the limitation of processing technology is so the method that selection punch-pin is individually processed with cavity plate.Processing During mould, the Blade dimensions and tolerance of punch-pin and cavity plate are first marked on pattern, then punch-pin and cavity plate are added according to drawing respectively Work, in order to ensure reasonable gap value, it is necessary to meet following relationship：

T_p+T_d≤Z_max-Z_min (2-2)

Or take T_p=0.4 (Z_max-Z_min) (2-3)

T_d=0.6 (Z_max-Z_min) (2-4)

Piercing punch cutting edge basic size

Perforating die cutting edge of die basic size

Blanking die punch-pin cutting edge basic size

Perforating die punch-pin cutting edge basic size

The influence factor of this blanking pressure size is a lot, mainly has：

(1) mechanical property of carbon fibre material；

(2) material thickness；

(3) the profile girth of diplopore connector；

(4) blade clearance；

(5) the sharp keen degree of cutting edge；

(6) speed and lubrication circumstances etc. are punched.

The size of blanking pressure can be calculated after all kinds of factors by considering.

The calculating of punching blanking pressure

The design punch-pin uses the punch force calculation of flat sword blanking die：

F_Punching=kL₁tτ_b (3-1)

F in formula_Punching- blanking pressure, N；

K-safety coefficient；

L₁- blanking part is punched the girth in hole, mm；

T-sheet thickness, mm；

τ_b- material shearing strength, MPa.Strength degree of drawing materials σ_bThe 80% of=1429.9MPa, i.e. τ_b=0.8 σ_b。

T300 tensile strength sigma_bFor 1429.9MPa, therefore τ_b=0.8 σ_b=143.92MPa.

Therefore the blanking pressure rushed needed for single hole can be calculated according to above formula.

The sum of one-off hole-piercing is understood according to stock layout, so total blanking pressure is

F_{Punching is total}=N₁F_Punching (3-2)

N in formula₁- it is disposable punching number.

When designing blanking die and selection pressing equipment, it is necessary to check the power of forcing press.When the blanking pressure of calculating is big When the nominal pressure of forcing press, some measures can be used to reduce blanking pressure, but being punched work(can't but reduce, therefore may go out Existing forcing press meets the phenomenon that the requirement of blanking pressure is but overloaded in terms of work(is punched, when forcing press overloads in terms of power When, hysteresis phenomenon can be produced, causes the rotating speed of flywheel can drastically reduce, forcing press is overloaded and is damaged.

So the punching work(in single hole is

Always punching work(is

W_{Punching is total}=N₁W_Punching (3-4)

It can thus be seen that punching work(very little, therefore can be without checking computations.

At the end of punching, the material fallen can typically swell in radial direction, due to the elastic deformation of material and the work of bending springback With the hole on flitch can produce elastic shrinkage in radial direction, while flitch tries hard to revert to original straightened condition, causes on flitch Hole lock ring on punch-pin, flitch fall part be tightly stuck in cavity plate, therefore, in order that punching be carried out continuously, design rush When cutting out mould, it is also necessary to which other power of calculating have stripping force, ejecting force and kicking force.The calculating of these power can be rule of thumb public Formula：

(1) stripping force F₁Workpiece or waste material are taken off to required power from punch-pin.

F₁=K₁F_{Punching is total} (3-5)

(2) ejecting force F₂The power for releasing workpiece or waste material along the direction of blanking pressure out of cavity plate.

F₂=nK₂F_{Punching is total} (3-6)

N is the product or amount of waste material got caught in simultaneously in cavity plate in formula；N=h/t, h are cavity plate straight wall cutting edge height, Mm, t are thick for material, mm.

(3) kicking force F₃The power for ejecting workpiece or waste material against punching force direction out of cavity plate.

F₃=K₃F_{Punching is total} (3-7)

Wherein K₁、K₂、K₃, respectively stripping force, ejecting force, head part force coefficient,

The present invention is determined by the way of elastic tripper and bottom discharge, so total blanking pressure F_zFor：

F_z=F₁+F₂+F₃ (3-9)

The calculating of blanking blanking pressure

The design blanking punch uses the punch force calculation of flat sword blanking die：

F_Blanking=KL₂tτ_b (3-10)

F in formula_Blanking- blanking pressure, N；

K-safety coefficient；

L₂The girth of-blanking part blanking, mm；

T-sheet thickness, mm；

τ_b- material shearing strength, MPa.Intensity of drawing materials is drawn materials strength degree σ_bThe 80% of=1429.9MPa, i.e. τ_b =0.8 σ_b.T300 tensile strength sigma_bFor 1429.9MPa, therefore τ_b=0.8 σ_b=143.92MPa

Therefore the blanking pressure needed for rushing single blanking can be calculated according to known conditions.

The sum of a blanking is understood according to stock layout, so total blanking pressure is

F_{Fall total}=N₂F_Blanking (3-11)

N in formula₂- it is disposable blanking number.

When designing blanking die and selection pressing equipment, it is necessary to check the power of forcing press.When the blanking pressure of calculating is big When the nominal pressure of forcing press, some measures can be used to reduce blanking pressure, but being punched work(can't but reduce, therefore may go out Existing forcing press meets the phenomenon that the requirement of blanking pressure is but overloaded in terms of work(is punched, when forcing press overloads in terms of power When, hysteresis phenomenon can be produced, causes the rotating speed of flywheel can drastically reduce, forcing press is overloaded and is damaged.

So the blanking work(of single diplopore connector is

Always punching work(is

W_{Fall total}=N₂W_Blanking (3-13)

It can thus be seen that punching work(very little, therefore can be without checking computations.

At the end of punching, the material fallen can typically swell in radial direction, due to the elastic deformation of material and the work of bending springback With the hole on flitch can produce elastic shrinkage in radial direction, while flitch tries hard to revert to original straightened condition, causes on flitch Hole lock ring on punch-pin, flitch fall part be tightly stuck in cavity plate, therefore, in order that punching be carried out continuously, design rush When cutting out mould, it is also necessary to which other power of calculating have stripping force, ejecting force and kicking force.The calculating of these power can be rule of thumb public Formula：

(1) stripping force F₁Workpiece or waste material are taken off to required power from punch-pin.

F₁=K₁F_{Fall total} (3-14)

(2) ejecting force F₂The power for releasing workpiece or waste material along the direction of blanking pressure out of cavity plate.

F₂=nK₂F_{Fall total} (3-15)

N is the product or amount of waste material got caught in simultaneously in cavity plate in formula；N=h/t, h are cavity plate straight wall cutting edge height, Mm, t are thick for material, mm.

(3) kicking force F₃The power for ejecting workpiece or waste material against punching force direction out of cavity plate.

F₃=K₃F_{Fall total} (3-16)

Wherein F₁、F₂、F₃Respectively stripping force, ejecting force, kicking force, the present invention are determined using elastic tripper with The mode of discharging, so total blanking pressure F_zFor：

F_z=F₁+F₂+F₃ (3-17)

Compared with having calculated after total blanking pressure of the punching with blanking, larger blanking pressure is drawn, is forcing press Selection provides certain parameter and supported.

Because this punching is using the production in enormous quantities of self-feeding, institute larger plus the appearance and size of raw material To determine to use open type crank press.Because the blanking pressure of forcing press will remain with sufficient leeway, plus the speed of punching Comparatively fast, so the summation of various power is no more than 1.3 times of forcing press nominal pressure in blanking process.According to this calculating compared with Big blanking pressure result of calculation, may be selected the forcing press of appropriate model.

According to the characteristics of this punching press, decision uses general expression punch-pin, is divided into mounting portion and fixed part.Mould structure And its composition determines that the factor such as length, the length between processing reconditioning quality, fixed plate and the stripper of punch-pin of punch-pin also can Influence the length of punch-pin.Punch-pin length not enough can not then insert cutting edge of die and material is punched；It is long to reduce punch-pin work The stability of work, the damage such as easily bend or fracture.

The punch-pin length of single process blanking die is first calculated for design punch-pin first, either simplex sequence punch-pin length determines formula：

L=H_Gu+H_Unload+H_Lead+Y (4-1)

In formula：L-punch-pin length, mm；

H_Gu- punch retainer thickness, mm；

H_Unload- positive stripper thickness, mm；

H_Lead- side guide plate thickness, mm；

Y-increment (including corresponding processing reconditioning quality, punch-pin are pressed into the distance of cavity plate, punch retainer with stripper Between length etc..When punch-pin and fixed plate rivet, plus 1~2mm of increment of die part.), mm.

, should also be according to the punch-pin in punch die standard according to the method described above after counted punch-pin length if selection standard punch-pin Length series chooses length of the immediate full-length as actual punch-pin.

The checking computations of punch strength：

(1) compression verifies

Maximum crushing stress to punch-pin can not be more than the permissible compression stress of punch-pin, i.e.,：

In formula：P-maximum blanking pressure, N；

F-punch-pin cutting edge sectional area, mm²；

[σ_Pressure]-punch-pin carries out the permissible compression stress after Quenching Treatment, MPa.Knot depending on material, heat treatment and mould Structure, by《Diel application manual》Check in [σ_Pressure]=2000~2200MPa.

1. punching compression verifies

Punching maximum blanking pressure P_Punching

Punch-pin cutting edge area of section is A_Punching

When ensure piercing punch safety.

2. blanking compression verifies

By knowing maximum blanking pressure P above_Fall,

Punch-pin cutting edge sectional area is A_Fall,

When ensure blanking punch safety.

This punching belongs to high-volume punching process, and the required precision to blanking part is higher, so the design of cavity plate It must is fulfilled for the high requirement of easily manufactured precision.The cutting edge of die of the present invention is gradient, has fixed height h, due under cutting edge Gradually expand at the material leakage in portion, therefore cavity plate working portion intensity is poor, clout is easily gathered on top, but this kind of punch-pin is applied to The mould that waste material falls along pressing direction, the dimensional accuracy of blanking part is high, easy to make, so it is general to be of wide application.

Cutting edge straight wall height h is relevant with by slug thickness t, and h≤4mm is typically taken as t≤1mm, when, t ＞ 1mm take h=4~ 8mm.Therefore cutting edge straight wall height can be determined according to material is thick.According to bibliography《Diel application manual》It is specific to check in cavity plate Thickness.

Blade clearance refers to the space between mould convex mould and cutting edge of die.Punch-pin and the side clearance of cavity plate two and referred to as For double-faced clearance, represented with Z, be divided into maximal clearance and minimum clearance.Blade clearance is convex, recessed to the cross section quality of blanking The service life of mould, blanking pressure etc. have a very big impact.Carbon fibre material is also easy to produce flash, for prevent the generation of flash and Concave-convex mold service life etc., the present invention determine gap method using theoretical, and Main Basiss are to ensure that crackle overlaps up and down, and intersect at Straight line, to obtain the preferable cross section quality of no flash.

Punch and matrix Blade dimensions when blanking and punching, relation such as Figure 37 institutes of tolerance and blanking part size and its tolerance Show.

In figure：D_dThe basic size of-cavity die of blanking die cutting edge, mm；

D_pThe basic size of-blanking punch cutting edge, mm；

d_dThe basic size of-perforating die cutting edge of die, mm；

d_pThe basic size of-perforating die punch-pin cutting edge, mm；

D_maxThe maximum limit of size of-blank, mm；

d_minThe minimum limit of size in-punching aperture, mm；

Δ-blanking part tolerance；

Z_minThe two-sided reasonable clearance of-minimum, mm；

Z_maxThe two-sided reasonable clearance of-maximum, mm (are not marked) in figure；

T_d- cutting edge of die manufacturing tolerance；

T_d- punch-pin cutting edge manufacturing tolerance；

K-coefficient；

In order to avoid blanking part size is all inclined to dimension limit, blanking part actual size should be made close to the centre of tolerance range Size.K Distribution values between 0.5~1.0, and it is relevant with the accuracy class of blanking part through consult《Diel application manual》, Determine COEFFICIENT K, minimum two-sided reasonable clearance Z_min, blanking part tolerance Δ, piercing punch cutting edge, manufacturing tolerance T_p, cutting edge of die system Make tolerance T_d, blanking punch cutting edge manufacturing tolerance T_p, the occurrence such as cutting edge of die manufacturing tolerance.

Punching course is specifically divided into the step of a, b, c, d, e, f, g seven：The first time punching press as shown in Figure 10-a, starts to put plate Enter in the crack between two feeding rolls, press the initial stop pin of stripper both sides, plate enters under the drive of roll to be unloaded Gap between flitch and lower template, stop travelling forward under the obstruction of initial stop pin, the i.e. initial punching in plate position Hole position, now roll stopping feeding forward, punch-pin move downward, go out three groups of holes, initial position, stepper motor are moved on punch-pin Drive roll to be sent into plate forward, it be a punching press process to be sent into distance, and punch-pin moves down second of punching of beginning, as Figure 10- b.Said process is repeated, to during the 4th punching, such as Figure 10-d, the hole initially gone out reaches blanking position, blanking punch lower end Alignment pin and punching coordinate and complete positioning, punch-pin, which continues to move down, afterwards completes punching, blanking.Said process is repeated, reaches the During seven punchings, such as Figure 10-g, seven groups of blanking punches fully enter working condition, afterwards repeatedly said process, and punching, blanking can Complete simultaneously.

Wherein, initial stop pin support plate is L-shaped, and long side is arranged in the through hole of stripper side, initial stop pin spring One end is fixed on initial stop pin support plate short side, and the other end is fixed on stripper.Stripper lower surface, which is provided with, limits plate The guide groove of right position during feeding, the width of guide groove is plate width, and the depth of guide groove is 1.5 times of sheet thickness. Plate manually pushes inward initial stop pin before being sent into mould in first time, and the long edge through hole of initial stop pin support plate, which enters, to be oriented to Groove, projection is formed in guide groove side, hinder plate to move on.Plate is sent into forward through feeding roll along guide groove, is met just Beginning pin stop support plate stop motion, now plate be positioned in piercing punch below first three groups punch-pin, obtained after stamped such as figure Three groups of totally six holes shown in 10-a.Initial stop pin support plate is unclamped after punching press terminates in first time, under the action of the spring initially Pin stop support plate is retracted, and plate travels forward one under the drive of feeding roll to be entered away from preparation punching press next time.Punching press afterwards Process need not use initial stop pin.

Punch member distribution mode is：Such as Fig. 9, punch retainer is evenly divided into the big rectangular piece of some grades, Its partitioning scheme and arrangement mode are identical with the pattern type of blanking part.A blockage, which is selected, in first row disposes first Blanking punch unit, 1.5 times of the advanced first row of punch member of secondary series enter away from tertial punch member falls behind secondary series 1.5 times are entered away from being gone together with first row punch member.So by that analogy, blanking punch is disposed, punch member is originated and terminal is convex Form unit is located in same horizontal line, and blanking punch is integrally arranged also to be distributed into wave, and amplitude is more than the ripple of Blanking Layout Unrestrained amplitude, similarly, piercing punch unit are often gone advanced blanking punch 3 and entered again away from being uniformly distributed in before blanking punch unit.Two Individual trimming punch be located at secondary series and the 6th row, fall behind same row blanking punch 4.5 enter again away from.

For overcome the deficiencies in the prior art, present invention also offers a kind of full-automatic material-feeding system of processing, including it is described Carbon fibre composite diplopore connector punch-forming mold and feeding unit, it is continuous between the upward mould of feeding unit and lower mould Feeding；

Further, feeding unit includes the front and rear two groups of roll shafts set, and preceding group of roll shaft includes two rollers setting up and down Axle, rear roll shaft of organizing include one in upper, two three roll shafts being triangularly arranged under, wherein in preceding group of roll shaft upper roll shaft with Motor connects.

In addition, motor is stepper motor III -1, roll shaft is supported by roll shaft seat III -2, and rear roll shaft of organizing can wrap Include three roll shafts, upper, two under, are triangularly arranged a roll shaft, keep plate horizontal, in addition, in roll shaft seat bottom Base III -12 is set, and feeding roll parts are fixed on press bench by base III -12, ensure feed direction and mould Plate direction of advance is alignd in tool, and through the top of arrival cavity plate after five roll shafts, the distance that flitch advances once is equal to flitch Punch-pin distribution in single rectangular elements width, as shown in Figure 15 and Figure 16, stepper motor by belt III -5, belt wheel III - 4th, roll shaft III -6 before the first travelling gear III -3, the second travelling gear III -8 and the 3rd travelling gear III -10 drive first, Roll shaft III -7 before second, roll shaft III -9 after first, roll shaft III -11 after second, the rotation of roll shaft III -13 after the 3rd.

To sum up, this system of processing is integrally arranged as two row's piercing punches, two row's blanking punches (i.e. four row's punch-pin, two row's ripples Unrestrained formula punch-pin) and row's trimming punch, common three-level punch-pin.

The preferred embodiment of the application is the foregoing is only, is not limited to the application, for the skill of this area For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.

Claims (10)

1. mould in carbon fibre composite diplopore connector punch forming, it is characterised in that including：

Upper bolster, it is detachably connected with forcing press；

Punch retainer, located at upper bolster lower surface, it is provided with some through holes；

An at least row is used for the piercing punch of stamping inner aperture, and piercing punch lower surface carries two punching projections, rushes Hole punch-pin is set through the through hole of punch retainer, and same row's piercing punch undulate is set；

An at least row is used for the blanking punch of stamping outline, and blanking punch is set through the through hole of punch retainer, And same row's blanking punch undulate is set, blanking punch is located at piercing punch rear.

2. mould in carbon fibre composite diplopore connector punch forming according to claim 1, it is characterised in that described Upper bolster is provided with perforate, sets die shank in perforate, and die shank includes bottom plate and the connecting shaft set from bottom plate protrusion, die shank with it is described Forcing press connects.

3. mould in carbon fibre composite diplopore connector punch forming according to claim 1, it is characterised in that also wrap The trimming punch for cutting off rim charge is included, trimming punch is in cylinder, located at the rear of the blanking punch, and under trimming punch Side sets pin stop.

4. mould in carbon fibre composite diplopore connector punch forming according to claim 1 a, it is characterised in that row In the blanking punch it is adjacent two row spacing for 1.5 times enter away from；

In piercing punch described in one row it is adjacent two row spacing for 1.5 times enter away from；

Further, blanking punch is consistent with part outline with piercing punch, and blanking punch lower surface sets alignment pin.

5. carbon fibre composite diplopore connector punch-forming mold, it is characterised in that including lower mould, the lower mould and according to power Profit requires that mould coordinates in carbon fibre composite diplopore connector punch forming any one of 1-4, and lower mould includes：

Die shoe, it is detachably connected with press bench；

Die block, located at die shoe upper surface, it is provided with some grooves；

The punching concave die that an at least row coordinates with the piercing punch, punching concave die are set through groove；

The blanking die that an at least row coordinates with the blanking punch, blanking die are set through groove；

Guide pillar, located at the corner of die block, to limit the moving direction of upper bolster.

6. carbon fibre composite diplopore connector punch-forming mold according to claim 5, it is characterised in that described Die block sidepiece sets the charging fagging played a supporting role；

Further, the stripper of limiting plate discharge position is provided in the upper surface of die block.

7. carbon fibre composite diplopore connector punch-forming mold according to claim 5, it is characterised in that described Lower mould also includes trim die, and blanking die is located between trim die and punching concave die.Trim die coordinates with trimming punch.

8. carbon fibre composite diplopore connector punch-forming mold according to claim 6, it is characterised in that described The initial stop pin that limiting plate material advances when stripper at least side is provided for punching plate for the first time, initial stop pin include Initial stop pin support plate and initial stop pin spring, initial stop pin support plate is L-shaped, and long side is arranged on the through hole of stripper side In, initial stop pin spring one end is fixed on initial stop pin support plate short side, and other end stripper is fixed.

9. a kind of full-automatic material-feeding system of processing, it is characterised in that fine including the carbon according to any one of claim 5-8 Tie up composite diplopore connector punch-forming mold and feeding unit, friction feeding between the upward mould of feeding unit and lower mould；

Further, feeding unit includes the front and rear two groups of roll shafts set, and preceding group of roll shaft includes two roll shafts setting up and down, after Group roll shaft includes one in upper, two three roll shafts being triangularly arranged under, wherein upper roll shaft and driving in preceding group of roll shaft Motor connection.

10. a kind of full-automatic material-feeding system of processing according to claim 9, it is characterised in that the piercing punch falls The length of material punch-pin is calculated according to equation below：

L=H_Gu+H_Unload+H_Lead+Y

In formula：L-punch-pin length, mm；

H_Gu- punch retainer thickness, mm；

H_Unload- positive stripper thickness, mm；

H_Lead- side guide plate thickness, mm；

Y-increment, i.e., the length that processing reconditioning quality, punch-pin are pressed between distance, punch retainer and the stripper of cavity plate are total With；

Total blanking pressure F of upper mould_zCalculated according to equation below：

F_z=F₁+F₂+F₃

F₁=K₁F_{Fall total} F₂=nK₂F_{Fall total} F₃=K₃F_{Fall total}

F_{Fall total}=N₂F_Blanking F_Blanking=KL₂tτ_b

In formula：N₂- it is disposable blanking number；

F_Blanking- blanking blanking pressure, N；

F_{Fall total}- total blanking pressure of blanking, N；

K-safety coefficient；

L₂The girth of-blanking part blanking, mm；

T-sheet thickness, mm；

τ_b- material shearing strength, MPa

K₁、K₂、K₃, respectively stripping force, ejecting force, head part force coefficient；

F₁、F₂、F₃Respectively stripping force, ejecting force, kicking force；

F_z- total blanking pressure.