CN1032244C - Method for grinding shallow recessed arc curved surface - Google Patents

Abstract

The present invention relates to a method for grinding a shallow concave cambered curved surface, which belongs to special form surface grinding. The present invention uses the existing grinding machine to directly process and form parts, with no need of super large special equipment and a cutter, production period can be shortened, and processing cost can be lowered. The present invention is characterized in that firstly, a workpiece is fixed to a workbench, and then a main shaft of a machine tool deflects an angle according to a computational formula. The radius of the cutter is determined, the workbench makes longitudinal and horizontal movement, and the cutter is processed into a needed cambered surface through a network on the workpiece. The present invention can also be used for the milling field and is particularly suitable for processing size precision with micron order, roughness is more than 0.8, and the diameter of the cambered surface of a shallow concave cambered surface is one to sixty meters.

Description

Method for grinding shallow recessed arc curved surface

The invention belongs to the method for grinding on a kind of special shape surface, also can be used for the Milling Process field.

The metal parts or the mould of processing belt concave arc curved surface are particularly processed the shallow recessed arc curved surface of cambered surface diameter in the time of 1～60 meter, and after traditional process was roughing, file was repaiied in pincers worker, then by the model hand lapping.This processing method efficient is extremely low, and the interchangeability of product is poor, and product percent of pass is also very low.Also have employing to roll processing method abroad and carry out circular arc camber processing, but use special equipment to cost an arm and a leg, cost is very high.

The purpose of this invention is to provide existing grinding machine of a kind of utilization or milling machine, only need angle of machine tool chief axis deflection can be processed the processing method of the shallow recessed arc curved surface that meets parts size precision.Be specially adapted to dimensional accuracy at micron order, surface roughness exists More than, the grinding of the shallow recessed arc curved surface of cambered surface diameter in the time of 1～60 meter.

The present invention is achieved in that

1, at first with the part to be processed clamping on the platen face, again with angle of machine tool chief axis deflection, and definite tool radius, then workbench is moved as vertical equity, cutter can be processed into required circular arc camber on workpiece;

2, machine tool chief axis deflection angle and tool radius calculate with following formula:

Δ＝ρ－R _I

α-machine tool chief axis deflection angle

R _Cutter-tool radius

R _I-part to be processed arc radius

H-part to be processed circular arc the degree of depth

The radius of curvature of the part circular arc of ρ-processed

Δ-error

3, carry out error analysis:

When the Δ value requires dimensional accuracy greater than part to be processed, can increase tool radius, retry again, be less than or equal to the desired dimensional accuracy of part to be processed up to the Δ value.

When adopting the inventive method processing shallow recessed arc curved surface, also need meet the following conditions:

(1), the machine tool diameter is greater than the part chord length.

(2), the machine tool chief axis angle of deflection should be in the lathe allowed band.

The present invention has compared following advantage with background technology:

1 compares with hand lapping after the roughing, and production efficiency has improved 15 times, and part processing precision significantly improves, and product percent of pass generally can reach 100%, and product interchangeability is strong.

2, adopt the present invention can use existing grinding machine, milling machine carries out direct machine-shaping to part or mould, has solved the contradiction that machine tool can not be processed shallow recessed arc curved surface, has shortened the production cycle.

3, adopt the present invention to process the shallow recessed arc curved surface of cambered surface diameter in the time of 1～60 meter, needn't design and make superhuge special equipment and cutter, cut down finished cost.

Fig. 1 is a processing parts clamping schematic diagram of the present invention

Fig. 2 is the part to be processed figure of embodiment 1

Fig. 3 is the A-A cutaway view of part shown in Figure 2

Fig. 4 is the plastic forming dies die of embodiment 2

Fig. 5 is the A-A cutaway view of die shown in Figure 4

1-part among the figure, 2-grinding machine spindle case, 3-emery wheel, 4-magnetic platform

R among Fig. 3 _I=30012.52mm, $h={0.04}_0^{+0.01}\mathrm{mm}$ Roughness is

R among Fig. 5 _I=5780.05mm, $h={0.1}_0^{+0.06}\mathrm{mm}$ Roughness

Embodiment 1:

Fig. 2, Fig. 3 are the part to be processed figure of embodiment 1.Adopt M6025A universal cutter grinder or 2M9125 multi-purpose grinding machine, simultaneously locate with two holes, with parts fixation on platen, respectively with R _I=30012.52mm, calculate in the h=0.04mm substitution formula:

R _CutterGet 100mm, α gets 10 ' 43 " then:

ρ＝30012.52069mm

Δ＝0.00069mm

Δ＜0.01mm error is far smaller than dimensional tolerances 0.01mm, for the jig Design manufacturing provides loose condition.Element precision all is guaranteed.And can further increase work efficiency by many clampings.

Embodiment 2:

Fig. 4, Fig. 5 are the plastic forming dies dies of embodiment 2, adopt the 2M9120 multi-purpose grinding machine, and with the location of deciding, baseplane, clamping is on work top, respectively with R _I=5780.05mm, calculate in the h=0.1mm substitution formula:

R _CutterGet 50mm, α gets 25 ' 46 " then:

ρ＝5780.053849mm

Δ＝0.0038486mm

Δ＜0.006mm

Error is far smaller than accessory size franchise 0.006mm.Calculate when theory and to satisfy the drawing requirement, and actual processing does not reach when requiring, and checks at first whether actual operation parameter is selected consistent with theory, check then whether machine tool accuracy is overproof, whether clamping workpiece locatees correct, adjust respectively after looking for bright reason, can accomplish the end in view.

Claims (1)

1, a kind of method for grinding shallow recessed arc curved surface is characterized in that:

After a, part to be processed are fixed on the workbench, with angle of machine tool chief axis deflection, and definite tool radius, and aftertable moves as vertical equity, cutter can be processed into required cambered surface on workpiece;

B, machine tool chief axis deflection angle and tool radius calculate with following formula

Δ=ρ-R _Iα in the formula-machine tool chief axis deflection angle

R _Cutter-tool radius

R _I-part to be processed arc radius

H-part to be processed circular arc the degree of depth

The radius of curvature of the part circular arc of ρ-processed

Δ-error

C carries out error analysis: when Δ value during greater than the part to be processed dimensional accuracy, can increase tool radius and retry, be less than or equal to the part to be processed dimensional accuracy up to the Δ value.

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