The clamp of workpiece and commonly used clamp device

The composition of clamp device -- the dynamical plant, clamping unit, intermediate orgnaization that send force 2.

The main demand of clamp device (the fixed position that 1) clamp both neither should destroy workpiece, or the clamp with too large generation is out of shape, want to have enough clamping force again, prevent workpiece to produce vibration in treatment; (The clamp journey with enough 2) , clamp action is quick, operate convenient, safe save labour; (3) hand moves clamp orgnaization to want to have reliable lock up a gender oneself, motor-driven clamp device wants what consider clamp as a whole to lock up the stability of gender and impulsion oneself; (4) structure should as far as possible simple and compact, make, maintenance is convenient. (2) clamping force is decided really 1.

The principle of way of effect of affirmatory clamping force (the way of 1) clamping force should make fixed position tool reference plane and contact of fixed position component all right, make sure work location is accurate and reliable; (2) intensifies the direction of force answering the as oldest as workpiece stiffness way is consistent, be out of shape in order to reduce workpiece; (The direction that 3) intensifies the cutting force that the direction of force should get with workpiece as far as possible, gravity waiting is consistent, intensify force in order to reduce. 2.

The principle that effect of strength of affirmatory clamping apparatus nods (the action point that 1) intensifies force should is opposite the component that prop up or inside the face propping up that is located in place of the component that prop up to form; (The action point of force of 2) clamping apparatus should be located in the place with workpiece better tigidity. (The action point of force of 3) clamping apparatus should near treatment surface as far as possible, in order to reduce the moment of force that cutting force orders to clamp, the treatment vibration that prevent or reduces workpiece or bend be out of shape. 2, the commonly used clamp device in commonly used clamp device clamping apparatus has wedge piece, helix, prejudicial annulus wait, they are according to principle of oblique plane clamp clamp workpiece. · wedge piece clamp device wedge piece clamp device is one of the basiccest clamp device forms, other clamp device all is it be out of shape. It basically is used at increasing clamping force or direction of change clamping force. ⑴ wedge piece clamp device characteristic: ① locks up a gender oneself (from ψ of ≤ of lock condition α inclined wedge of ② of 1+ ψ 2) can change inclined wedge of ③ of direction of clamp active force to have enlarge strength effect, ip= θ / P=1/[tan ψ 2+tan(α + efficiency of small ⑤ of journey of clamp of ④ of ψ 1)] is low (because inclined wedge and clamping apparatus body are reached,sliding friction is between workpiece, is clamp efficiency so low) so suitable scope: ? Chirp computation of clamping force of ⑵ of? of cover of pa of Hou of firewood of  of rotten windowing  : 2+tan(α of θ =p/[tan ψ + ψ 1)] among them P is original force, α is wedge piece to promote role, invariable 6 degrees- - 1: of 10 degrees of ψ ? Two? of which Σ of Lv of  of ぜ  helmet ψ 2: ? Core to instruct two? ⑶ locks up which Σ of Lv of thoroughfare helmet  oneself condition: After original force P dismantles, wedge piece still won't loosen below attrition strength effect the phenomenon of workpiece is called from the lock.

1+ ψ of α ≤ ψ 2, general α is taken 10- - 15 spend or ⑷ of smaller Nextpage passes force coefficient: Of clamping force and original force pass force coefficient than calling.

Express Ip= θ with Ip / P=1/[tan ψ 2+tan(α + wedge of ⑸ of ψ 1)] piece dimension and material: After α promoting role is affirmatory, its job length should satisfy clamp to ask, its ply makes sure heat treatment is not out of shape, small head is thick should be 75mm.

Material uses 20 steel or 20Cr commonly, cementite is thick for 0.

8--1.

2mm.

HRC:56- - 62.

Ra is 1.

6 μ M.

·Device of clamp of helix of helix clamp device is from wedge piece clamp device is changed and come, be equivalent to wedge piece is circled on cylinder, when rotational helix can clamp works.

Characteristic of device of ⑴ helix clamp: ① structure is simple, it is easy to make, force of reliable ② enlarge compares clamp Ip is big, start of clamp of unlimited ③ of clamp journey S is slow, : of circumstance of efficiency low application? Trade of pa of Hou of firewood of brother's son  2 take along sth to sb?

⑵ screw clamping force calculates: α of the Tan(in θ =PL/r + ψ 1)+r1tan ψ 2 among them: PIt is original force, l is original force effect the dot is apart from to screw center, the half of the classics in helix is in R, α is helix promotes role, 1 nut of ψ the angle of friction at screw, radius of computation of R1 attrition moment of force, 2 workpiece of ψ and screw head (or pressure piece) the ⑶ of angle of friction between locks up function oneself: Because of wedge piece from the lock the condition is α ≤ 11.

5 ° - 17 ° , and the helix that helix clamp installs promotes role (2 ° of α ≤ - 4 ° ) very small, lock up a gender oneself so very good.

⑷ passes force coefficient: Ip= θ / α of the Tan(in P=PL/r + ψ 1)+r1tan ψ 2 ＞ ＞ the Ip ⑸ of wedge piece is much or many clamp: The auxiliary time that approachs to reduce clip and improve productivity, can use many or many clamp device.

⑹ is pressed piece data is average a 45 steel, HRC:43- - the data of 48 screw is average a 45 steel, HRC:33- - device of 38 · prejudicial clamp is prejudicial clamp device also is by wedge piece one kind when clamp installs is out of shape.

⑴ circle is prejudicial clamping force: α of Tan(of θ =PL/ ρ + ψ 1)+tan ψ 2 among them L is handle length, center of ρ bearing axis (centre of turning circle) to clamp the dot is apart from ψ 1, ψ 2 it is respectively prejudicial annulus reach with bearing axis prejudicial annulus with the angle of friction between workpiece.

⑵ passes force coefficient Ip: α of Ip=L/ ρ Tan(+ ψ 1)+tan ψ 2, far the characteristic of Ip ⑶ that is less than helix clamp and applied circumstance: Prejudicial clamp and helix clamp photograph are compared, clamp journey is small, clamping force is small, lock up ability difference oneself, but clamp is rapid, the structure is compact, so commonly used not as big as cutting force, oscillatory and lesser circumstance, often use jointly with other clamping unit.

·Structure of clamp of centering of centering clamp structure is one kind uses the fast shift such as fixed position clamping unit or flexibility to be out of shape the device in make sure workpiece allows to decide a heart or be opposite.

Make the fixed position of workpiece and clamp process are finished at the same time, and fixed position component and clamping unit close 2 for one.

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