Special clamp for machining half shaft hole of differential shell

Abstract

The utility model relates to a special clamp for processing a half axle hole of a differential shell, which is a hydraulic clamp and comprises a clamp base, a centering mechanism, a centering bench clamp and a pre-positioning support, and the centering mechanism, the centering bench clamp and the pre-positioning support are assembled on the clamp base. The centering mechanism is arranged in the center of the clamp base; the centering bench clamps are symmetrically arranged on the two sides of the centering mechanism, and each centering bench clamp comprises a bench clamp base and a pair of clamping jaws in sliding fit with the bench clamp base; the pair of clamping jaws are respectively driven by a synchronous oil cylinder to reciprocate along the base; the pair of pre-positioning supports is symmetrically arranged between the centering mechanism and the pair of centering bench clamps. According to the utility model, dynamic centering along with the size change of a part is realized, the consistency of the machining axis of the part and the machining axis of a cutter is ensured, the problem of inaccurate centering caused by the size change of the part in the original clamp is solved, the product percent of pass is greatly improved, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical processing and manufacturing technology, and relates to a differential housing machining fixture, and more particularly to a special fixture for machining the half shaft hole of the differential housing. Background Technology

[0002] The differential housing has axle hole A and axle hole B at both ends, such as Figure 3 As shown, half-shaft holes A and B are required to be coaxial. Due to the casting process of the differential housing, risers and gates are left in the half-shaft holes at both ends. During the machining of the half-shaft holes, it is necessary to treat these risers and gates and perform rough machining on the half-shaft holes at both ends.

[0003] Currently, the fixtures for machining the half-shaft holes at both ends of the differential housing typically use fixed V-shaped locating blocks to support the differential housing from both ends, and then a clamping mechanism presses them down onto the fixed V-shaped locating blocks. When the dimensions of the differential housing change, the machining center shifts due to the fixed V-shaped locating blocks, causing the half-shaft holes to become misaligned. This results in the half-shaft holes at both ends being out of sync, ultimately preventing assembly and impacting production efficiency while increasing costs.

[0004] In view of the above, it is necessary to further develop a special fixture for rough machining of the half-shaft holes at both ends of the differential housing. Summary of the Invention

[0005] In order to solve the problem of the half-shaft holes at both ends of the differential housing being misaligned due to the uncertain machining center of the aforementioned rough machining fixture, this utility model proposes a special fixture for machining the half-shaft holes of the differential housing that can automatically align the machining center.

[0006] This utility model is achieved through the following technical solution:

[0007] The aforementioned special fixture for machining the half-shaft hole of a differential housing is a hydraulic fixture. The fixture includes a fixture base and a centering mechanism, a centering vise, and a pre-positioning bracket mounted on the fixture base. The centering mechanism is used for centering the part and is located in the center of the fixture base. The centering vise has a pair symmetrically arranged on both sides of the centering mechanism, including a vise base and a first jaw and a second jaw slidably mounted on the vise base. The first jaw and the second jaw are arranged opposite each other and are synchronously driven by two drive cylinders to reciprocate along the base. The pre-positioning bracket has a pair symmetrically arranged between the centering mechanism and the pair of centering vises.

[0008] The special fixture for machining the half-shaft hole of the differential housing, wherein: the vise base is fixedly mounted on the fixture base and is provided with a slide rail; the first jaw and the second jaw are slidably mounted on the slide rail.

[0009] The differential housing half shaft hole machining special fixture, wherein the first clamping jaw and the second clamping jaw are provided with V-shaped clamping holes in opposite directions, and the clamping holes are provided with gaskets.

[0010] The differential housing half shaft hole machining special fixture, wherein the predetermined positioning support comprises a vertical support part, V-shaped positioning parts and fixing parts which are respectively extended in opposite directions from upper and lower ends of the vertical support part; the V-shaped positioning parts are extended towards the clamping center of the centering vice, and the openings are upwardly arranged and have a height lower than the first clamping jaw and the second clamping jaw; the fixing parts are extended towards the centering mechanism, and are fixed on the fixture base through fasteners.

[0011] The differential housing half shaft hole machining special fixture, wherein the centering mechanism is driven by the pressing oil cylinder, and comprises a centering base and floating pressing pins; two pairs of pin holes are symmetrically arranged on two sides of the centering base; the floating pressing pins are matched with the pin holes, are respectively and floatingly arranged in the pin holes, and the lower ends are connected to the driving end of the pressing oil cylinder to drive the floating pressing pins to be synchronously pressed out.

[0012] The differential housing half shaft hole machining special fixture, wherein the fixture base comprises an upper bottom plate and a lower bottom plate, and the upper bottom plate and the lower bottom plate are supported through a support; the upper bottom plate is provided with oil channels and oil channel interfaces; the driving oil cylinder and the pressing oil cylinder are assembled between the upper bottom plate and the lower bottom plate of the fixture base. Beneficial effects

[0013] The differential housing half shaft hole machining special fixture of the utility model, since the centering vice adopts a pair of moving clamping jaws driven by the synchronous oil cylinder, realizes dynamic centering with the change of the size of the part, ensures that the machining axis of the part and the tool are consistent, overcomes the problem of inaccurate centering caused by the size change of the part of the original fixture, greatly improves the product qualification rate, saves the processing cost, improves the production efficiency, and is very practical in practical use. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structure schematic view of the differential housing half shaft hole machining special fixture of the utility model;

[0015] Figure 2 It is a part clamping schematic view of the differential housing half shaft hole machining special fixture of the utility model;

[0016] Figure 3 It is a structure schematic view of the differential housing. DETAILED DESCRIPTION

[0017] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0018] In the description of the embodiments of the present application, the positions or position relationships indicated by the technical terms "in", "out", "up", "down", etc. are based on the positions or position relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0019] The utility model will be described in detail below in combination with the drawings and specific embodiments.

[0020] As Figure 1 , Figure 2 The differential housing half shaft hole machining special fixture of the utility model is hydraulic fixture, including fixture base 1, centering mechanism 2, centering vice 3 and pre-positioning support 4.

[0021] Fixture base 1 is used to assemble and support centering mechanism 2, centering vice 3 and pre-positioning support 4, and is used to be connected with external equipment (not shown in the figure). The fixture base 1 includes an upper bottom plate 11 and a lower bottom plate 12, which are supported by a support 13. The upper bottom plate 11 is provided with oil paths and various oil path interfaces. It can be understood that the upper bottom plate 11 can be a plate structure. The fixture base 1 is detachably connected with the external equipment, such as by a pin, a bolt, etc. The external equipment can be a numerical control machine table, etc.

[0022] Centering mechanism 2 is used for part centering, and is arranged at the center of the upper bottom plate 11 of the fixture base 1 and is driven by a jacking oil cylinder (not shown in the figure). It includes a centering base 21 and floating jacking pins 22. The centering base 21 is symmetrically provided with two pairs of pin holes 211, and the two pairs of pin holes 211 are respectively arranged on the two sides of the centering base 21. The floating jacking pins 22 have a plurality of floating jacking pins 22 matched with the pin holes 211 of the centering base 1, respectively floatingly arranged in the pin holes 211, and the lower ends are connected to the driving end of the jacking oil cylinder (not shown in the figure). Under the driving of the jacking oil cylinder, the plurality of floating jacking pins 22 are synchronously jacked out to the two sides of the flange of the differential housing, and the differential housing is centered. The jacking oil cylinder (not shown in the figure) is assembled on the fixture base 1 between the upper bottom plate 11 and the lower bottom plate 12.

[0023] The centering vice 3 has a pair of, symmetrically arranged on both sides of the centering mechanism 2, and is respectively supported on both ends of the differential housing, and the clamping center is consistent with the machining center of the cutter. The centering vice 3 comprises a vice base 31, a first jaw 32 and a second jaw 33; the vice base 31 is fixedly assembled on the upper bottom plate 11 of the clamp base 1, and is provided with a sliding rail 311; the first jaw 32 is slidingly assembled at one end of the sliding rail 311, and can be driven by a first driving oil cylinder (not shown) to move along the sliding rail 311; the second jaw 33 is slidingly assembled at the other end of the sliding rail 311, and can be driven by a second driving oil cylinder (not shown) to move along the sliding rail 311; the first driving oil cylinder and the second driving oil cylinder are assembled on the clamp base 1, located between the upper bottom plate 11 and the lower bottom plate 12, and are matched with the first jaw 32 and the second jaw 33, and synchronously drive the first jaw 32 and the second jaw 33 to move towards the center, so as to ensure that the clamping center is stable and does not deviate with the size change of the differential housing; the first jaw 31 and the second jaw 33 have oppositely arranged V-shaped jaws, and the jaws are provided with a gasket 34.

[0024] The pre-positioning support 4 has a pair of, symmetrically arranged between the centering mechanism 2 and the pair of centering vice 3, for initial positioning of the part. The pre-positioning support 4 comprises a vertical support part 41, a V-shaped positioning part 42 and a fixing part 43 respectively extending reversely along the upper and lower ends of the vertical support part 41; the V-shaped positioning part 42 extends towards the centering vice 3, and the opening is upwardly arranged, with a height lower than the jaws of the first jaw 32 and the second jaw 33; the fixing part 43 extends towards the centering mechanism 2, and is fixedly assembled on the upper bottom plate 11 of the clamp base 1 by a fastener.

[0025] The center of the centering mechanism 2, the clamping center of the centering vice 3 and the center line of the pre-positioning support 4 are parallel in the vertical direction.

[0026] The operation of the differential housing half shaft hole machining special fixture is as follows:

[0027] The differential housing to be machined is first placed on the pre-positioning support 4 for pre-positioning, the centering mechanism 2 is started to center the differential housing, and then the centering vice 3 is started to clamp the differential housing from both ends, each driving oil cylinder drives a jaw, and the first jaw 32 and the second jaw 33 of the two centering vice 3 are synchronously pressed from both sides to the center under the driving of the two pairs of oil cylinders, so as to ensure the stability of the clamping center, and the two centering vice 3 simultaneously and synchronously clamp the part from both ends, and the machine tool starts to machine the half shaft holes at both ends of the differential housing after the clamping is correct.

[0028] The special fixture for machining half axle hole of differential shell is characterized in that a pair of moving clamping claws of the centering vice are synchronously driven by driving oil cylinders, dynamic centering is realized with the change of the size of the part, the clamping center will not deviate with the change of the size of the differential shell, the clamping center is ensured to be consistent with the machining axis of the tool, and the problem of inaccurate centering caused by the change of the size of the part of the original fixture is overcome.

[0029] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A differential case half shaft bore machining fixture, being a hydraulic fixture, characterized in that: The fixture comprises a fixture base, a centering mechanism, a centering vice and a pre-positioning support assembled on the fixture base; The centering mechanism is used for part centering and is arranged in the center of the fixture base; The centering vice has a pair of symmetrically arranged centering vices, comprising a vice base and a first jaw and a second jaw slidingly assembled on the vice base; the first jaw and the second jaw are oppositely arranged and are synchronously driven to reciprocate along the base by two driving oil cylinders respectively; The pre-positioning support has a pair of symmetrically arranged pre-positioning supports between the centering mechanism and the pair of centering vices.

2. The differential case half shaft bore machining fixture of claim 1, wherein: The vice base is fixedly assembled on the fixture base and is provided with a sliding rail; the first jaw and the second jaw are slidingly assembled on the sliding rail.

3. The differential case half shaft bore machining fixture of claim 2, wherein: The first jaw and the second jaw have oppositely arranged V-shaped jaws, and the jaws are provided with gaskets.

4. The differential case half shaft bore machining fixture of claim 1 wherein: The pre-positioning support comprises a vertical support part, V-shaped positioning parts and fixing parts respectively extending in opposite directions from the upper and lower ends of the vertical support part; the V-shaped positioning parts extend towards the clamping center of the centering vice and are provided with upward openings, and the height of the V-shaped positioning parts is lower than that of the first jaw and the second jaw; the fixing parts extend towards the centering mechanism and are fixed on the fixture base by fasteners.

5. The differential case half shaft bore machining fixture of claim 1 wherein: The centering mechanism is driven by a jacking oil cylinder and comprises a centering base and floating jacking pins; two pairs of pin holes are symmetrically arranged on the two sides of the centering base; the floating jacking pins are matched with the pin holes and are respectively floatingly arranged in the pin holes, and the lower ends of the floating jacking pins are connected to the driving end of the jacking oil cylinder to synchronously drive the floating jacking pins to be jacked out by the jacking oil cylinder.

6. The differential case half shaft bore machining fixture of claim 1 wherein: The fixture base comprises an upper bottom plate and a lower bottom plate, and the upper bottom plate and the lower bottom plate are supported by a support; the upper bottom plate is provided with an oil channel and various oil channel interfaces; The driving oil cylinder and the jacking oil cylinder are assembled between the upper bottom plate and the lower bottom plate of the fixture base.

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