CN201338202Y

CN201338202Y - Double eccentric crankshaft holding fixture

Info

Publication number: CN201338202Y
Application number: CNU2008202377394U
Authority: CN
Inventors: 王春才
Original assignee: CHINA METAL (SUZHOU) PRECISION MACHINERY Co Ltd
Current assignee: CHINA METAL (SUZHOU) PRECISION MACHINERY Co Ltd
Priority date: 2008-12-31
Filing date: 2008-12-31
Publication date: 2009-11-04
Anticipated expiration: 2018-12-31

Abstract

The utility model relates to a double eccentric crankshaft holding fixture, which comprises a cylindrical fixture body whose end portion is provided with steps, wherein a through-hole is processed on the fixture body, the axial line of the through-holes is parallel to the axial line of the fixture body in a certain distance, the top surface of the end portion of the fixture body is provided with a first eccentric positioning pin, and second eccentric positioning grooves are arranged on the two sides of the through-hole. The external surface of the fixture body is provided with fixture positioning threaded holes, the fixture body is evenly provided with three grooves, wherein two grooves are shallow grooves, and the other one is a groove which is penetrated through the side wall of the through-hole. The utility model can process eccentric shaft elements in accordance with the eccentricity of the inner diameter and the outer diameter of the holding fixture, and can process double eccentric shaft elements with required angle through changing the positioning mode of the elements, has simple structure, convenient manufacture and use and low cost, saves time for alignment, greatly improves the precision requirement, and is suitable for batch production, thereby improving the production efficiency, and reducing the processing cost. The double eccentric crankshaft holding fixture can be used on any three-claw chuck, thereby expanding the universality of the chuck.

Description

Two eccentric crankshaft anchor clamps

Technical field

The utility model relates to a kind of anchor clamps of lathe turning processing, specifically relate to a kind of two eccentric crankshaft anchor clamps of lathe that are exclusively used in the eccentric and two eccentric crankshaft class parts of car, be particularly useful for the two eccentric crankshaft class parts of lathe turning of general scroll chuck chuck.

Background technology

Eccentric element is used very extensive on plant equipment, and in machine driving, gyration becomes linear reciprocating motion or linear reciprocating motion becomes gyration, generally all utilizes eccentric element to finish.The lubricating pump that drives with eccentric work piece of headstock case for example, the bent axle in the automobile engine, the bent axle of compressor of air conditioner etc., but the processing technology of eccentric element is a more complicated, and subject matter is the difficult eccentric throw of getting hold of, and difficulty reaches corresponding tolerance.

Eccentric element is exactly that cylindrical and the cylindrical of part or cylindrical are parallel with the axis of endoporus and do not coincide the part of deviation certain distance.Distance between these two lattice parallel to the axis is called eccentric throw.The part of cylindrical and excircle eccentricity is called eccentric shaft or eccentric disc; The part of cylindrical and endoporus off-centre is eccentric bushing.As illustrated in fig. 1 and 2, Fig. 1 is the two eccentric crankshafts that two off-centre are arranged on the compressor of air conditioner, and Fig. 2 is the left view of Fig. 1, and e is the workpiece eccentric throw.

Eccentric shaft, eccentric bushing generally all are to process on lathe, and their process principle is basic identical; Mainly be aspect clamping, to take measures, promptly the axis centering of the eccentric part of needs processing to coinciding with the lathe spindle rotation.At present, the method for general car eccentric work piece has multiple, mainly contain scroll chuck get on the bus eccentric work piece, chuck get on the bus eccentric work piece, at the eccentric chuck special fixture eccentric work piece of getting on the bus.

Below, will analyze traditional technology of utilizing scroll chuck clamping car eccentric element:

Method for turning:

Good the cylindrical car of the part of the non-eccentricity in the eccentric work piece earlier, subsequently between any one claw of chuck and workpiece contact-making surface, the pad lastblock is chosen the pad of thickness in advance, calibrated bus and eccentric throw, and after the workpiece clamping, get final product turning, as shown in Figure 3, Fig. 3 is the clamping schematic diagram that utilizes the mode car off-centre operation of scroll chuck shimming.

Spacer thickness can calculate with approximate formula: spacer thickness x=1.5e.If will make calculating more accurate, then need in approximate formula, to bring eccentric throw correction value k into and calculate and adjust spacer thickness, approximate formula is: spacer thickness x=1.5ek,

K=1.5 Δ e, Δ e=e-e surveys

In the formula: e---workpiece eccentric throw; K---eccentric throw correction value; Actual measurement eccentric throw error after the Δ e---test run; E surveys--survey eccentric throw after the-test run.

Need repeat above operation during the car double-eccentric shaft.Traditional when utilizing scroll chuck clamping car eccentric element, clamping is cumbersome, is difficult for centering, is easy to generate error; And be not suitable for producing in batches.

At present, a kind of eccentric chuck special fixture of special use is arranged abroad, be about to special-purpose eccentric chuck anchor clamps and be installed on the main shaft of lathe, eccentric stiffener is in chuck body inside, shape is complicated, involve great expense, and this lathe only is used to do this off-centre class part, and versatility is very limited.If a machine tool one procedure can't be finished during the two eccentric element of processing, need two procedures.

The utility model content

For solving above-mentioned deficiency, the purpose of this utility model is to provide that a kind of versatility is good, cost is low, the two simply and easily eccentric crankshaft anchor clamps of clamping method, has guaranteed the precision of processing, has improved the flexible production of equipment, is fit to produce in batches.

For realizing above purpose, the utility model is to realize by following technical scheme:

1, a kind of pair of eccentric crankshaft anchor clamps, it is characterized in that comprising a chuck body, described chuck body is cylindrical, forms step in the end, through hole of processing on chuck body, the axis of described through hole and apart certain distance parallel with the axis of chuck body; End face at the step of chuck body end is provided with first eccentric pin, and the axis of described first eccentric pin is parallel with the axis of chuck body; End face at the step of chuck body end also is provided with two second eccentric locating slots, lays respectively at the both sides of through hole; On the outer surface of chuck body, be provided with the anchor clamps positioning spiro pit.

2, according to claim 1 pair of eccentric crankshaft anchor clamps, it is characterized in that described chuck body have three grooves in appearance equably, wherein two grooves are shallow slot, another groove connects the sidewall of through hole.

3, according to claim 1 pair of eccentric crankshaft anchor clamps is characterized in that the described second eccentric locating slot is two projectioies, is symmetrically located at the both sides of through hole.

The beneficial effects of the utility model: the utility model adopts the cylindrical of scroll chuck clamping fixture, be contained in the part of endoporus by the resilient clamp of anchor clamps, process eccentric axial workpiece according to the eccentric throw of anchor clamps external diameter and internal diameter, can process the part of the double-eccentric shaft class of required angle by the locate mode that changes part.The utility model is simple in structure, makes, easy to use, and cost is very low, carries out clamping processing by these anchor clamps, has saved the time of a lot of centerings, and the requirement of precision also improved a lot, is fit to produce in batches, thereby lifting production efficiency, cuts down finished cost.The utility model can also use on any scroll chuck, has widened the versatility of chuck.

Description of drawings

Fig. 1 is the two eccentric crankshafts that two off-centre are arranged on the compressor of air conditioner;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is the clamping schematic diagram that utilizes the mode car off-centre operation of scroll chuck shimming;

Fig. 4 is the front view of of the present utility model pair of eccentric crankshaft anchor clamps;

Fig. 5 is the left view of Fig. 1;

Fig. 6 is the stereogram of of the present utility model pair of eccentric crankshaft anchor clamps;

Fig. 7 is the clamping schematic diagram when utilizing the utility model processing first off-centre;

Fig. 8 utilizes the utility model to process the clamping schematic diagram that second off-centre is.

The specific embodiment

Below in conjunction with accompanying drawing the utility model is made specific description.

The utility model is realized the off-centre of institute's machining crankshafts by the eccentric e of anchor clamps.

Fig. 4 is the front view of of the present utility model pair of eccentric crankshaft anchor clamps; Fig. 5 is the left view of Fig. 1; Fig. 6 is the stereogram of of the present utility model pair of eccentric crankshaft anchor clamps.

As shown in the figure, of the present utility model pair of eccentric crankshaft anchor clamps comprise chuck body 1, and chuck body 1 is cylindrical, form step in the end, and through hole 2 of processing is used for the clamping part on chuck body 1.The axis of through hole 2 parallel with the axis of chuck body 1 and at a distance of certain apart from e (this distance is determined according to the eccentric throw of the actual workpiece that will process), end face at the step of chuck body 1 end is provided with first eccentric pin 3, location when being used for first off-centre, the axis of first eccentric pin 3 is parallel with the axis of chuck body 1.End face at the step of chuck body 1 end also is provided with two second eccentric locating slots 4, lays respectively at the both sides of through hole 2, is used for locating when processing second is eccentric first off-centre.The second eccentric locating slot 4 can adopt two projectioies, is symmetrically located at the both sides of through hole 2, just in time first off-centre can be clipped in the middle.On the outer surface of chuck body 1, be provided with anchor clamps positioning spiro pit 5, be used for anchor clamps are positioned at chuck.

Chuck body 1 also have three grooves in appearance equably, wherein two grooves 6 are shallow slot, another groove 7 connects the sidewall of through holes 2.When clamping workpiece, can strain, increase elasticity, thereby better holding workpiece can not make it be moved man-hour adding.

Adding man-hour, will the product processed bent axle pack in the through hole 2 of the present utility model,, and the utility model is fixed on the main shaft chuck of lathe by the jaw of universal chuck with first eccentric pin, 3 location, and being screwed bent axle, clamping back well just can begin to process first off-centre.Because the effect of two eccentric fixtures, the axis of the main shaft of bent axle and the axis of chuck are just in time at a distance of eccentric distance e, the axis that has so just guaranteed first off-centre just in time coincides with the axis of chuck, is in coaxial state, need not to adjust the accurate location that can guarantee first off-centre.As shown in Figure 7, Fig. 7 is the clamping schematic diagram when utilizing the utility model processing first off-centre.

After first eccentric processing is good, unclamp chuck jaw, rotate the product bent axle and rotate 180 degree, first off-centre that processes is put into the second eccentric locating slot 4, the axis that makes second off-centre just in time with the dead in line of chuck, need not centering and can guarantee second off-centre.Can process second off-centre after fixing.As shown in Figure 8, Fig. 8 utilizes the utility model to process the clamping schematic diagram that second off-centre is.

The utility model only need change the locate mode of bent axle promptly can process two eccentric bent axles, fast, accurately.We can also process many more eccentric work pieces to utilize this design of Clamping Apparatus theory, mainly are to carry out clamping processing by the anchor clamps that design different eccentric throws.

The foregoing description does not limit the utility model in any form, and all employings are equal to replaces or technical scheme that equivalent transformation obtained, all drops in the protection domain of the present utility model.