Steering knuckle casting hydraulic fixture

A steering knuckle casting hydraulic fixture includes a positioning mandrel, a pair of flat keys fixed on a bottom surface of a fixture body, a linear bearing and an elastic taper pin match a steering knuckle casting, an angle positioning seat, a straight pin, an angle positioning nail, an angle clamping nail, a nut, a spring, a spring seat and a linear cylinder are used to restrict the rotational freedom of the casting around the Z axis, hydraulic corner cylinders, pressure plates, and support nails are used to clamp the casting, and three guide blocks are used to guide the installation of the steering knuckle casting.

CROSS REFERENCE TO RELATED APPLICATION

This application claims priority to Chinese Patent Application No. 201810364854.6 entitled STEERING KNUCKLE CASTING HYDRAULIC FIXTURE filed on Apr. 23, 2018, which is incorporated herein by reference for all purposes.

FIELD OF THE INVENTION

The present invention relates to the technical field of hydraulic fixtures, in particular to a steering knuckle casting hydraulic fixture.

BACKGROUND OF THE INVENTION

With the development of lightweight automobiles, aluminum castings with the advantages of light weight, attractive appearance, corrosion resistance and the like have been widely applied. As one of important parts of an automotive steering axle, the steering knuckle has to bear multiple impact loads of the automobile during driving to ensure stable driving and steering. The traditional steering knuckle machining often uses three-jaw chucks for manual positioning and clamping, which has the disadvantages of low precision, low efficiency, easy damage to the surface of the product, poor quality and the like and hardly achieves mass production.

SUMMARY OF THE INVENTION

An objective of the present invention is to provide a steering knuckle casting hydraulic fixture, which automatically positions, supports and clamps a casting through standard hydraulic elements and detects the fastening state of the casting by airtight detection. The steering knuckle casting hydraulic fixture includes a fixture body, a positioning mandrel, a flat key a, a flat key b, a hydraulic corner cylinder a, a pressure plate a, a support nail a, a hydraulic corner cylinder b, a pressure plate b, a support nail b, a hydraulic corner cylinder c, a pressure plate c, a support nail c, a linear bearing, an elastic taper pin, a straight pin, an angle positioning seat, an angle positioning nail, an angle clamping nail, a nut, a spring, a spring seat, a linear cylinder, a guide block a, a guide block b, a guide block c and a seal plug.

An oil inlet path, an oil outlet path and a gas path are provided inside the fixture body, and the exterior of the fixture body is provided with a bottom surface, a plane A, a plane B, a plane C and a plane D, wherein the plane A, the plane B and the plane C are parallel to each other and perpendicular to the bottom surface, and the plane D is parallel to the bottom surface. The positioning mandrel, the flat key a and the flat key b are all fixed on the bottom surface of the fixture body to connect machining equipment. The hydraulic corner cylinder a is fixed on the plane A of the fixture body, the pressure plate a is fixed on an output shaft of the hydraulic corner cylinder a, and the support nail a is fixed on the plane B of the fixture body. The hydraulic corner cylinder b is fixed on the plane A of the fixture body, the pressure plate b is fixed on an output shaft of the hydraulic corner cylinder b, and the support nail b is fixed on the plane B of the fixture body. The hydraulic corner cylinder c is fixed on the plane C of the fixture body, the pressure plate c is fixed on an output shaft of the hydraulic corner cylinder c, and the support nail c is fixed on the plane C of the fixture body.

The linear bearing is fixed on the plane B of the fixture body and connected with the elastic taper pin through a moving pair. The tapered surface of the elastic taper pin matches a steering knuckle casting to restrict the freedom of movement of the casting in the X, Y and Z directions and the freedom of rotation around the X and Y axes. The angle positioning seat is positioned by the straight pin and fixed on the plane C of the fixture body. The angle positioning nail is fixed on the angle positioning seat, and the linear cylinder is fixed on the plane D of the fixture body, is connected with the angle clamping nail through the spring seat, the spring and the nut, and cooperates with the angle positioning nail to restrict the rotational freedom of the casting around the Z axis. The guide block a, the guide block b and the guide block c are all fixed on the plane B of the fixture body to guide the installation of the steering knuckle casting. The seal plug is used to plug a process hole of the fixture body.

The present invention has the advantages of the steering knuckle casting hydraulic fixture, which automatically positions, supports and clamps a casting through standard hydraulic elements and detects the fastening state of the casting by airtight detection, can bear large cutting force during rough machining, can also guarantee accurate positioning during precision machining and can be used for batch machining of steering knuckle castings.

DETAILED DESCRIPTION OF EMBODIMENTS

As shown inFIGS. 1 and 2, a steering knuckle casting hydraulic fixture includes a fixture body2, a positioning mandrel3, a flat key a1, a flat key b4, a hydraulic corner cylinder a5, a pressure plate a6, a support nail a7, a hydraulic corner cylinder b13, a pressure plate b14, a support nail b12, a hydraulic corner cylinder c19, a pressure plate c20, a support nail c18, a linear bearing9, an elastic taper pin10, a straight pin16, an angle positioning seat17, an angle positioning nail21, an angle clamping nail22, a nut24, a spring23, a spring seat25, a linear cylinder26, a guide block a8, a guide block b11, a guide block c15and a seal plug27.

An oil inlet path29, an oil outlet path30and a gas path28are provided inside the fixture body2, and the exterior of the fixture body2is provided with a bottom surface, a plane A, a plane B, a plane C and a plane D, wherein the plane A, the plane B and the plane C are parallel to each other and perpendicular to the bottom surface, and the plane D is parallel to the bottom surface. The positioning mandrel3, the flat key a1and the flat key b4are all fixed on the bottom surface of the fixture body to connect machining equipment. The hydraulic corner cylinder a5is fixed on the plane A of the fixture body2, the pressure plate a6is fixed on an output shaft of the hydraulic corner cylinder a5, and the support nail a7is fixed on the plane B of the fixture body2. The hydraulic corner cylinder b13is fixed on the plane A of the fixture body2, the pressure plate b14is fixed on an output shaft of the hydraulic corner cylinder b13, and the support nail b12is fixed on the plane B of the fixture body2. The hydraulic corner cylinder c19is fixed on the plane C of the fixture body2, the pressure plate c20is fixed on an output shaft of the hydraulic corner cylinder c19, and the support nail c18is fixed on the plane C of the fixture body2.

The linear bearing9is fixed on the plane B of the fixture body2and connected with the elastic taper pin10through a moving pair. The tapered surface of the elastic taper pin10matches a steering knuckle casting to restrict the freedom of movement of the casting in the X, Y and Z directions and the freedom of rotation around the X and Y axes. The angle positioning seat17is positioned by the straight pin16and fixed on the plane C of the fixture body2. The angle positioning nail21is fixed on the angle positioning seat17, and the linear cylinder26is fixed on the plane D of the fixture body2, is connected with the angle clamping nail22through the spring seat25, the spring23and the nut24, and cooperates with the angle positioning nail21to restrict the rotational freedom of the casting around the Z axis. The guide block a8, the guide block b11and the guide block c15are all fixed on the plane B of the fixture body2to guide the installation of the steering knuckle casting. The seal plug27is used to plug a process hole of the fixture body2.