CN1404963A

CN1404963A - Grinding plate

Info

Publication number: CN1404963A
Application number: CN 02141637
Authority: CN
Inventors: 斯特芬·温施
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2001-09-08
Filing date: 2002-09-06
Publication date: 2003-03-26
Also published as: EP1291134A1; DE10144274A1

Abstract

A grinding plate (14, 54) is used for a hand tool machine (10), in particular for an eccentric grinding machine and a hand ultraprecision grinding machine, consisting of a wheel hub (16) with a support plate (18), at whose lower surface a flexible grinding buffer (20) is supported, characterized in that the support plate (18) is constituted as a bistable plate or a leaf spring (22, 23, 24), thereby, it is especially suitable to produce a flexure plane.

Description

Grinding plate

Technical field

The present invention relates to a kind of grinding plate according to the described type of claim 1 preamble.

Background technology

By US 5 309 682 known a kind of grinding dish, it has independent following grinding cushion pad, an abrasive sheet can be fixed on the downside of cushion pad.But the grinding cushion pad removably is fixed on the circular support plate made of plastic by adhesive closure (Klettverschluss) with its back side, and this support plate can be on the output shaft of center fixation at hand-guided grinding.At this, the back side of support plate is up and towards output shaft.

The grinding cushion pad can be connected on the support plate and the motion of support plate or output shaft is delivered on the grinding plate by adhesive closure.

Known grinding plate cushion pad can have different thickness and can be used for the face of grinding spill or convex bending on limited degree.But in this application scenario, the grinding cushion pad is limited on the relative less curvature with the adaptive of surface of the work radius of curvature, and in other words, the radius of curvature of surface of the work is greater than 200mm.

By US 5 931 727 known a kind of hand-guided grinding, be filled with particle in its grinding cushion pad, wherein, its downside has the shape opposite with workpiece by being pressed on the shaping workpiece, this negative shape is fixed by vacuum.Though thus can be with high-quality grinding complex surfaces shape, the manufacturing cost height of this machine.

Summary of the invention

Having the advantage that the present invention of claim 1 characteristic feature has is, also can with uniform thrust and uniformly the grinding amount process the surface of the work of radius of curvature＜200mm.In the case, that not only can process spill with same grinding plate but also can process the curved surface of convex.By support plate being constituted leaf spring or saucerspring, can under the relative condition with higher of bending rigidity, guarantee the high resiliency of grinding plate, can realize big grinding amount thus.

Saucerspring or leaf spring constitute as the circular flat ring with flank profil of radially inwardly pointing to, wherein, a wheel hub remains on the tooth top that radially inwardly points to regularly, by this, can realize a kind of bistable spring element in simple mode, it automatically continues to be turned in the bending position of a mirror image symmetry when crossing certain bending position and remains in this position.Therefore, prebend dished this leaf spring or a saucerspring can be turned in the position of a convex.

This leaf spring or saucerspring are surrounded with polyurethane or similar frostproof froth n, thus, can be by selecting expanded material and determining spring performance particularly well in conjunction with its determining dimensions.

Grinding plate has air suction opening, these air suction openings through feed grinding dish vertically in the backlash zone, thus, can dust suction under the situation of the spring performance that does not influence leaf spring or saucerspring.

Under the rectangular situation of grinding plate, two parallel outward flanges can overturn on bistable state ground, thus, can for example process the halfpipe profile that lengthwise extends equably by a superfine milling machine.

Description of drawings

Describe the present invention in detail by embodiment with reference to the accompanying drawings.Shown in the figure:

Fig. 1 has the vertical section of the hand held power machine of the circular grinding plate of the present invention;

Fig. 2 grinding plate shown in Figure 1 bends to the situation in its convex position;

The vertical section of the saucerspring of grinding plate shown in Fig. 3 Fig. 1 and 2;

The vertical view of Fig. 4 saucerspring shown in Figure 3;

The vertical section of another embodiment of Fig. 5 saucerspring;

The vertical view of Fig. 6 saucerspring shown in Figure 5; And

Fig. 7, the spring characteristic curve figure of 8 these saucersprings.

The specific embodiment

Fig. 1 illustrates a hand held power machine 10, and it has a housing 12, and this housing has not other handle label, that have push button up.Stretch out an output shaft 13 from the below of housing 12, by the screw 15 antitorque grinding plates 14 of fixing a circle, this grinding plate is thus along with output shaft 13 rotatablely moves with changeing on this.

Grinding plate 14 has a center hub 16, and this wheel hub has an axially extending bore 17 that is positioned at the center, and screw 15 passes this through hole and the back side of wheel hub 16 is fixed on the output shaft 13.This center hub centers a flat ring discoid spring 22, and this saucerspring is the chief component (Fig. 4,6) of a support plate 18.This saucerspring 22 has a flank profil 34 of radially inwardly pointing to, and this flank profil has backlash 36 and flat ligule tooth 38.These teeth stretch into the outward flange of flat disk wheel hub 16 with its end that is arranged in inner radial.

Saucerspring 22 in both sides by polyurethane or similarly the expanded material foaming surround and constitute the support plate 18 that is surrounded by a foam cushion pad 20 thus.

Foam cushion pad 20 is equipped with a hasp fabric 27 on its downside, can fix an abrasive sheet 29 on this hasp fabric.

The grinding plate of being made up of saucerspring 22 and foam cushion pad 20 14 has a plurality of air suction openings 40 that connect in the axial direction, only expresses one of them among the figure, from the back side of this air suction opening the aspirator that does not illustrate in addition can be set.

By a screw 15 grinding plate 14 being fixed on the output shaft 13 on the wheel hub 16, can easily change thus.

Saucerspring 22,23,24,25 are connected with the wheel hub made from the plastics of heat-resisting, high strength and high stability 16, this saucerspring is as bistable switch spring formation and form an insert that shape is sealed, this insert will be fixed at PU (polyurethane) foamed material or integral foam material that the periphery foaming forms, and this expanded material is formed on the grinding cushion pad 20 that both sides surround saucerspring 22.

Saucerspring 18 makes it possible to realize switch and regulatory function.It is used to: be embedded under the state in the polyurethane foam material and be deformed into protruding or recessed grinding dish/grinding plate 14 under the effect in power being in it.Can the processing of Even Grinding ground mainly be conical or spherical shape by this grinding dish.Flexible/the deformability of this saucerspring or grinding dish/grinding plate 14,54 allows to come grinding workpiece surface with approximate smooth form.Continue pressurization vertically if cross the plan-position of grinding plate or grinding dish, then produce rollover effect, grinding plate or grinding dish obtain the shape of back-flexing, promptly become protruding shape by recessed shape.

Make the grinding concave surface be more prone to thus, for example Yuan container or bodywork component, wherein the grinding dish can be easily adaptive with predetermined profile by the rubber-like spring.

Grinding plate 14 does not illustrate with hand held power machine shown in figure 2, and the grinding plate with shown in Figure 1 is identical basically for it.Be that with the difference of Fig. 1 support plate 18 outward flanges that have grinding cushion pad 20 are bent upwards, promptly oppositely and remain in this position, adapt to protruding workpiece to be processed surface.

Two kinds of different application of the spring performance of saucerspring or

leaf spring

22,23,24 are applied.

Fig. 3 illustrates the vertical section of saucerspring 22, and wherein the truncated cone shape of this saucerspring 22 is obvious especially.This can be seen that the continuous ring 32 in the outside, this ring radially inwardly carries out the transition in the flank profil 34 that has tooth 38.

Fig. 4 illustrates the vertical view of saucerspring 22 shown in Figure 3, and wherein flank profil 34 is obvious especially, and the tooth of this flank profil extends radially inwardly, and is separated equably by backlash 36.

Fig. 5,6 illustrate another embodiment of a bistable state saucerspring 23, the difference of this saucerspring and saucerspring 22 is, wideer and top tooth 78 extends to the center of circular discoid spring to tooth 78 always out and away than backlash 76, thus spring performance stiffened more.

Fig. 7 illustrates with power-stroke curve, how to reach maximum when power increases gradually.With the increase of putting forth effort, the reaction force of spring reduces; Spring saltus step when the plan-position can be when the grinding concave surface till being carried to maximum from this position.

Utilization according to the spring of characteristic shown in Figure 7 can the grinding concave surface, convex surface and grinding on flat face.Reach unsure state during through zero crossing at spring force.Can make saucerspring enter state spill or convex with very little power from this point.

Fig. 8 illustrates a characteristic curve of saucerspring, and it obtains like this: along with constantly compressing, spring force increases and i.e. upset before reaching the plan-position.If with the saucerspring unloading, then it returns to original state.Utilize this specific character only can process the surface of the work of spill and convex distortion.Only just can the grinding plane under the very tolerant situation of quality requirement.

Claims

1. be used for the grinding plate (14 on hand held power machine (10), especially eccentric milling drum and the hand-held superfine milling machine, 54), comprise a support plate (18), a flexible grinding cushion pad (20) at the downside upper support of this support plate, it is characterized in that: support plate (18) is as especially bistable leaf spring or saucerspring (22,23,24) constitute.

2. according to the grinding plate of claim 1, it is characterized in that: saucerspring (22) is a circular flat ring with the tooth (38) that radially inwardly points to.

3. according to the grinding plate of claim 1 or 2, it is characterized in that: support plate (18) and abrasive sheet (29) have the axially extending bore that is used for dust suction.

4. according to the grinding plate of claim 2, it is characterized in that: the tooth (38) of saucerspring (22) and backlash (36) are regularly alternately and constitute a flank profil (34) of radially inwardly pointing to, wherein, the end of tooth (38) is connected on the antitorque commentaries on classics of a radially inner side and a wheel hub (16) ground.

5. according to the grinding plate of claim 2, it is characterized in that: saucerspring (22) has the shape of a truncated cone shape jointly with flank profil (34), like this, can process the face of convex bending with medial surface.

6. according to the grinding plate of claim 1, it is characterized in that: saucerspring (22) is bistable, and its outward flange can be with respect to one in the crossing axially upset up or down of reference circle of radially inner side and tooth (38) end.

7. according to the grinding plate of one of aforementioned claim, it is characterized in that: grinding cushion pad (20) or (60) form by saucerspring (23,24,25) is especially surrounded in the both sides foaming.