CN111318906A - A Milling Fixture Used for Threaded End Face of Automobile Torsion Bar - Google Patents

Abstract

The invention discloses a milling fixture for a threaded end face of a torsion bar force arm of an automobile, which comprises: the torsion bar arm clamping device comprises an upper base plate, a lower base plate and a supporting plate, wherein the upper base plate is fixedly connected with the lower base plate, the lower base plate and the upper base plate are fixed on a workbench, the supporting plate is fixedly connected with the upper base plate, a pre-tightening mandrel and a positioning mandrel are arranged on the lower base plate, an eccentric wheel is arranged on the pre-tightening mandrel, a handle is arranged on the eccentric wheel, the eccentric wheel is adjustably connected with the pre-tightening mandrel, and a positioning column is arranged on the upper base plate.

Description

A Milling Fixture Used for Threaded End Face of Automobile Torsion Bar

technical field

The invention relates to the field of automobile parts and accessories manufacturing, in particular to the milling processing of the threaded end face of a torsion bar force arm used for the overturning of an automobile cab.

Background technique

The important parts of the turning mechanism of the cab of the medium truck are the torsion bar spring and the torsion bar moment arm. The turning angle of the cab is mainly determined by the relative installation angle of the torsion bar spring and the torsion bar moment arm. The torsion bar spring and the torsion bar moment arm After the relative installation angle of the torsion bar is determined, it is fixed by the tightening screw in the threaded hole of the torsion bar, and whether the tightening screw can fix the torsion bar spring for a long time is related to the relative position of the threaded hole of the torsion bar. Whether the drilling of the arm threaded hole is accurate or not, the premise is that the thread end milling must be accurate. The elastic force of the torsion bar is the main power source for the cab to be turned over, and the torsion bar arm is the main power transmitter for the cab to be turned over. Therefore, the performance of the torsion bar arm is directly related to the turning performance of the cab. However, the shape of the torsion bar arm is irregular, and its geometric accuracy and comprehensive performance depend to a large extent on its machining process. But so far, there is no relevant fixture. Due to the irregular shape of the torsion bar arm, it is not suitable for machining on the CNC machining center machine tool. Milling can only be performed by scribing. Not only the machining accuracy and machining efficiency are low, but also manufacturing high cost. However, the production of auto parts is a typical mass production mode, and the manufacturing cost has become an important part of the consideration of parts manufacturers.

SUMMARY OF THE INVENTION

In view of the above problems, the present invention provides a milling processing fixture for the thread end face of an automobile torsion bar arm, the purpose is to: the milling precision of the thread end face of the automobile torsion bar arm is higher, the efficiency is higher, the manufacturing cost is reduced, and the company's quality is guaranteed. The torsion bar moment arm meets the actual needs of the cab turning.

In order to achieve the expected purpose, the technical scheme adopted by the present invention:

A milling fixture for the threaded end face of an automobile torsion bar torque arm, characterized in that it comprises: an upper base plate, a lower base plate and a support plate, the upper base plate and the lower base plate are fixedly connected, and the lower base plate and the upper base plate are fixed in the working On the stage, the support plate is fixedly connected with the upper bottom plate, a pre-tightening mandrel and a positioning mandrel are arranged on the lower bottom plate, an eccentric wheel is arranged on the pre-tightening mandrel, and a handle is arranged on the eccentric wheel, and the The eccentric wheel is adjustable and connected with the preloading mandrel, and a positioning column is arranged on the upper bottom plate.

Further, the upper bottom plate, the lower bottom plate and the support plate are provided with connecting through holes.

Further, the lower bottom plate is fixed on the worktable by a hexagon socket head screw.

Further, the second hexagon socket head screw penetrates through the support plate, the upper bottom plate and the lower bottom plate in sequence and is fixed on the workbench. The fixing of the support plate and the upper bottom plate and the fixing of the upper bottom plate and the lower bottom plate on the workbench are realized.

Further, tapered pins are used for positioning and fixing between the upper bottom plate and the lower bottom plate.

Further, the support plate is fixed on the upper bottom plate by screws, and the support plate is in the shape of a long strip.

In this connection mode, the lower base plate is stably fixed on the workbench by the inner hexagon screw 1 and the inner hexagon screw 2, the upper base plate is fixedly connected with the lower base plate through the inner hexagon screw 3 and the conical pin, and the support plate is connected with the upper base plate through the screws. fixed. The connection relationship between the support plate and the upper base plate, the connection relationship between the upper base plate and the lower base plate, and the connection relationship between the lower base plate and the workbench are all stable. The connection of the entire unit on the workbench is stable.

Beneficial effects: The present invention solves the problem of placing the torque arm at different angles through the cooperation of the preloading mandrel and the positioning mandrel. The clamping action of the torsion bar arm with different bending radians is realized through the rotation adjustment of the eccentric wheel. Improve the stability and accuracy of the overall processing operation.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic diagram of the A-direction structure in FIG. 1 .

FIG. 3 is a schematic diagram of the structure in the direction B in FIG. 1 .

In the figure: 1. Upper base plate; 2. Positioning column; 3. Support plate; 4. Preload mandrel; 5. Eccentric wheel; 6. Washer; 7. Hex nut; 8. Handle; 9. Lower base plate; 10. Positioning mandrel; 11, hexagon socket head screw one; 12, conical pin; 13, socket head screw two; 14, screw; 15, hexagon socket head screw three; 16, torsion bar arm.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments.

In the present invention, unless otherwise expressly specified and limited, terms such as "arrangement", "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it may be a fixed connection or a It is a detachable connection; it can be a mechanical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

As shown in FIGS. 1 to 3 , a milling fixture for the threaded end face of an automobile torsion bar arm includes: an upper base plate 1 , a lower base plate 9 , and a support plate 3 . The upper base plate 1 is provided with a positioning column 2 . The upper base plate 1 , the lower base plate 9 and the support plate 3 are provided with connecting through holes. The support plate 3 is elongated, and the elongated support plate 3 is placed horizontally on the upper bottom plate 1 . The upper bottom plate 1 is fixedly connected with the lower bottom plate 9, and the lower bottom plate 9 and the upper bottom plate 1 are fixed on the workbench. The second hexagonal screw 13 penetrates the support plate 3, the upper bottom plate 1 and the lower bottom plate 9 in turn and is fixed on the workbench. The support plate 3 is fixed on the upper bottom plate 1 by screws 14, so that the upper bottom plate 1 and the lower bottom plate 9 are fixed on the workbench. , the upper base plate 1 and the lower base plate 9 are positioned and fixed by a conical pin 12 . The support plate 3 is fixedly connected with the upper bottom plate 1 . Specifically, the support plate 3 is fixed on the upper bottom plate by screws 14 . In this connection mode, the lower base plate 9 is stably fixed on the workbench by the inner hexagon screw 11 and the inner hexagon screw 13, and the upper base plate 1 is fixedly connected with the lower base plate 9 through the inner hexagon screw 2 13 and the conical pin 12, The support plate 3 is fixed to the upper bottom plate by screws 14 . The connection relationship between the support plate 3 and the upper base plate 1 , the connection relationship between the upper base plate 1 and the lower base plate 9 , and the connection relationship between the lower base plate 9 and the workbench are all stable. The connection of the entire unit on the workbench is stable. A pre-tightening mandrel 4 and a positioning mandrel 10 are arranged on the lower bottom plate 9, an eccentric wheel 5 is arranged on the pre-tightening mandrel 4, a handle 8 is arranged on the eccentric wheel 5, and the eccentric wheel 5 and the pre-tightening Mandrel 4 is adjustable for connection. The eccentric wheel 5 is sleeved with the pre-tightening mandrel 4 , and a hexagonal nut 7 is used for fixed connection above the eccentric wheel 5 .

Specific working principle:

First of all, according to the size and shape of the torsion bar arm 16, the fixture repairer fixes the upper base plate 1 on the lower base plate 9 through the hexagon socket head screws 3 15; The upper base plate 1 and the lower base plate 9 are on; the upper base plate 1 and the lower base plate 9 are fixed on the machine table surface by the inner hexagon screw one 11 and the inner hexagon screw two 13, and positioned by the conical pin 12; the support plate 3 is passed through the screw 14 Fixed on the upper base plate 1.

Next, the worker sets the inner hole of the torsion bar arm 16 on the outer circle of the positioning mandrel 10 , and the tail of the torsion bar arm 16 abuts on the outer circle of the positioning column 2 .

Again, the processor installs the eccentric wheel 5, the washer 6, and the hexagonal nut 7 on the pre-tightening mandrel 4 in turn, and installs the handle 8 on the eccentric wheel 5, and then rotates the handle 8 through the eccentric wheel 5 to tighten the torsion bar force arm 16. , while tightening the hexagonal nut 7 on the preloading mandrel 4 to fix the torsion bar arm 16 . Due to the shape characteristics of the eccentric wheel 5, for the torsion bar moment arm 16 with different bending degrees, the torsion bar moment arm 16 can be clamped only by rotating the eccentric wheel 5 to different angles.

Finally, according to the size of the torsion bar arm 16 and the distance to the machine tool, the worker moves the machine tool table and locks it to start the milling process. After the machining is completed, turn the hexagonal nut 7 and at the same time turn the handle 8 to loosen the torsion bar arm 16 through the eccentric wheel 5, remove the workpiece torsion bar arm 16, clean the iron filings everywhere, and prepare for the next machining.

In conclusion, the present invention achieves the intended purpose.

Claims (5)

1. The utility model provides a milling fixture that is used for car torsion bar arm of force screw thread terminal surface which characterized in that includes: the upper base plate is fixedly connected with the lower base plate, the lower base plate and the upper base plate are fixed on the workbench, the supporting plate is fixedly connected with the upper base plate, a pre-tightening mandrel and a positioning mandrel are arranged on the lower base plate, an eccentric wheel is arranged on the pre-tightening mandrel, a handle is arranged on the eccentric wheel, the eccentric wheel is adjustably connected with the pre-tightening mandrel, and a positioning column is arranged on the upper base plate.

2. The milling fixture for the threaded end face of the torque rod arm of an automobile of claim 1, wherein the upper base plate, the lower base plate and the support plate are provided with connecting through holes.

3. The milling fixture for the threaded end face of the torque rod arm of the automobile as claimed in claim 2, wherein the upper base plate, the lower base plate and the support plate are fixed by a second socket head cap screw.

4. The milling fixture for the threaded end face of the torque rod arm of the automobile as claimed in claim 3, wherein the socket head cap screw II penetrates through the support plate, the upper base plate and the lower base plate in sequence and then is fixed on the workbench.

5. A milling fixture for threaded end faces of torsion bar arms of automotive vehicles according to claim 1, wherein said support plate is elongated.

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