CN103692340A - Grinding rod for inner spherical surface of sliding shoe part - Google Patents

Abstract

The invention provides a grinding rod for an inner spherical surface of a sliding shoe part. The grinding rod (3) is in a hollow cylinder shape with a step (6), wherein an inner thread (8) which is connected with a swinging rod (4) of a spherical surface honing machine is machined on the inner surface of a small cylinder (7) above the step (6); the diameter D of an inner hole of a large cylinder (9) below the step (6) is less than or equal to D1; the D1 is the diameter of an inner spherical surface step (10) of a sliding shoe inner spherical surface (2); a fillet (11) is machined at the outer edge of a lower end face (5) of the grinding rod (3); the fillet (11) is not less than R of 0.5mm. Compared with the prior art, according to the technical scheme, the cylindrical grinding rod (3) is utilized to replace a grinding sphere to machine the inner spherical surface; the rotation and rotational motion with pressure can be used for fitting with the spherical surface machining and the precision is reliable. The cost can be greatly reduced and a machining process is simplified; the flow machining of large-batch production is convenient to realize.

Description

A kind of milling bar for piston shoes part Internal Spherical Surface

Technical field

The present invention is a kind of milling bar for piston shoes part Internal Spherical Surface, belongs to Machining Technology field.

Background technology

Plunger piston slippery boots assembly is part crucial in plunger displacement pump, and two parts, by the closing in effect of endosphere and ectosphere, keep flexible rotating, at high rotating speed, under long-life running requirements, just require plunger ectosphere and piston shoes Internal Spherical Surface precision very high, coordinates accurate.In general engine, similar piston shoes Internal Spherical Surface photometric requirement is 0.05, and dimensional tolerance ± 0.005, in surface profile requirement 0.0025.And traditional Internal Spherical Surface fine finishining, general employing requires the mill ball that size is slightly little to carry out grinding mutually of interior ectosphere than finally, add and can adopt the equipment such as craft or sphere grinding machine man-hour, sphere size, profile tolerance, the machining accuracies such as circularity are guaranteed by mill ball completely, part of every processing need to be used a new mill ball, such processing method just causes mill ball machining accuracy high, and single device quantity is many, be in great demand, for production in enormous quantities, processing cost is huge, used mill ball is difficult to reuse, certainly will cause great waste.

Summary of the invention

The deficiency that the present invention exists for above-mentioned existing product just and design a kind of milling bar for piston shoes part Internal Spherical Surface is provided, its objective is and meeting under the prerequisite of all high-precision requirement, with milling bar, replace mill ball working inner sphere, milling bar is a kind of reusable general lap tool, like this, not only reduce the difficulty of processing of mill ball, and avoided a shortcoming that mill ball can only be processed a part, the interchangeability and the versatility that greatly improve cutter, reach cost efficiency.

The object of the invention is to be achieved through the following technical solutions:

This kind is for the milling bar of piston shoes part Internal Spherical Surface, it is characterized in that: this milling bar (3) is the hollow cylindrical of band step (6), material is selected casting pig manufacture, the inner surface of the small cylinder (7) of step (6) top is processed with the internal thread (8) being connected with the swing arm (4) of spherical honing machine, and the outside diameter of the large cylinder (9) of step (6) below calculates by following formula:

$d\≥2(\sin \frac{a}{2}\·R-\sin \mathrm{\β}\·R)/\cos \mathrm{\β}$

In formula: the outside diameter of d large cylinder (9), effective arc length angle of a piston shoes Internal Spherical Surface (2), β swing arm (4) full swing angle, the radius of R piston shoes Internal Spherical Surface (2);

Diameter of bore D≤the D1 of the large cylinder (9) of step (6) below, D1 is the diameter of the Internal Spherical Surface step (10) of piston shoes Internal Spherical Surface (2);

The outer rim place processing rounding (11) of the lower surface (5) of milling bar (3), rounding (11) is not less than R0.5mm.

The feature of technical solution of the present invention is according to design feature and the size of piston shoes part Internal Spherical Surface, manufacture and design cylindrical milling bar, replace mill ball to grind Internal Spherical Surface, solved a problem that mill ball can only be processed a part, the interchangeability and the versatility that greatly improve cutter, reduced cost.

Accompanying drawing explanation

Fig. 1 is the structural representation of milling bar

Fig. 2 is the structural representation of piston shoes part

Fig. 3 is the structural representation of milling bar and the combination of piston shoes part Internal Spherical Surface

Fig. 4 is the structural representation of milling bar and spherical honing machine combination

The specific embodiment

Below with reference to drawings and Examples, technical solution of the present invention is further described:

Shown in accompanying drawing 1～4, this kind, for the milling bar of piston shoes part Internal Spherical Surface, is characterized in that: this milling bar 3 is the hollow cylindrical with step 6, and material can be selected casting pig, and step place can avoid milling bar to add man-hour and piston shoes Internal Spherical Surface is interfered.The inner surface of the small cylinder 7 of step 6 tops is processed with the internal thread 8 being connected with the swing arm 4 of spherical honing machine, and the outside diameter of the large cylinder 9 of step 6 belows need guarantee the maximum gauge edge that can contain piston shoes Internal Spherical Surface man-hour adding; Can calculate by following formula:

$d\≥2(\sin \frac{a}{2}\·R-\sin \mathrm{\β}\·R)/\cos \mathrm{\β}$

In formula: the outside diameter of d large cylinder 9, effective arc length angle of a piston shoes Internal Spherical Surface 2, β swing arm 4 full swing angles, the radius of R piston shoes Internal Spherical Surface 2.

Diameter of bore D≤the D1 of the large cylinder 9 of step 6 belows, D1 is the diameter of the Internal Spherical Surface step 10 of piston shoes Internal Spherical Surface 2, the design of endoporus is mainly in order to increase the storage of abrasive pastes, be convenient to attrition process, the loss that adds milling bar in man-hour is concentrated on to the edge of cylinder 9, be convenient to adjust parameter in good time;

Height dimension can be adjusted according to the size of spring pressure, take to add not interfere as principle man-hour.

The outer rim place processing rounding 11 of the lower surface 5 of milling bar 3, rounding 11 is not less than R0.5mm.

The step of the using method of milling bar of the present invention is:

(1) piston shoes part bottom face 1 is fixed on platform of machine tool main shaft, piston shoes part Internal Spherical Surface 2 upwards, is connected to milling bar 3 on the swing arm 4 of spherical honing machine, makes edge and 2 laminatings of piston shoes Internal Spherical Surface of the lower surface 5 of milling bar 3;

(2) adjust machined parameters

The operating pressure of milling bar 3 can be by changing the length adjustment of the spring 12 of spherical honing machine;

The amplitude of oscillation of swing arm 4 is to be obtained by piston shoes Internal Spherical Surface 2 arc length and swing arm 4 radius calculation, L=θ R, and in formula, L is the amplitude of oscillation of swing arm 4, and θ is the pendulum angle of swing arm 4, and R is swing arm 4 radiuses;

The wobble frequency of swing arm 4 can change by adjusting spherical honing machine, and wobble frequency is unsuitable too fast or excessively slow, should stabilize to prerequisite to maintain lathe, and machined parameters must be obtained by the processing experiment of certain batch, and different size part and Machine-settings are different;

(3), in processing experiment process, main shaft drives part to carry out rotation, approximately 10 revolutions per seconds of speed settings, and milling bar 3 is connected and is swung by swing arm 4, and two motions of swing and 2 rotation of piston shoes part Internal Spherical Surface guarantee the sphere matching of milling bar 3, guarantee machining accuracy.The initial trial stage needs time segment to measure, and checks respectively 1min, 2min, and 3min equal time section processing result, thus obtain process time of part.

Compared with prior art, technical solution of the present invention can be enough cylindricality milling bar 3 replace mill ball working inner spheres, and single milling bar 3 can processing parts quantity be not less than 20, by the rotation with pressure and the fit sphere that rotatablely moves, processes, precision is reliable.Adopt the method processing can greatly reduce cost, simplify process, be convenient to the flowing water processing of producing in enormous quantities.

Claims (1)

1. the milling bar for piston shoes part Internal Spherical Surface, it is characterized in that: this milling bar (3) is the hollow cylindrical of band step (6), the inner surface of the small cylinder (7) of step (6) top is processed with the internal thread (8) being connected with the swing arm (4) of spherical honing machine, and the outside diameter of the large cylinder (9) of step (6) below calculates by following formula:

$d\≥2(\sin \frac{a}{2}\·R-\sin \mathrm{\β}\·R)/\cos \mathrm{\β}$

In formula: the outside diameter of d large cylinder (9), effective arc length angle of a piston shoes Internal Spherical Surface (2), β swing arm (4) full swing angle, the radius of R piston shoes Internal Spherical Surface (2);

Diameter of bore D≤the D1 of the large cylinder (9) of step (6) below, D1 is the diameter of the Internal Spherical Surface step (10) of piston shoes Internal Spherical Surface (2);

The outer rim place processing rounding (11) of the lower surface (5) of milling bar (3), rounding (11) is not less than R0.5mm.

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