Crank curved bar end threaded hole drilling and tapping machining clamp

Abstract

In order to solve the problems that the machining quality of a threaded hole at the end of a bent lever is seriously affected due to the fact that the coaxiality of the threaded hole and the bent lever is low and the bent lever shakes in a threaded hole drilling and tapping machining method at the end of the bent lever of a crank in the prior art, the utility model provides a threaded hole drilling and tapping machining clamp at the end of the bent lever of the crank. A fixing frame, a bottom positioning part, a V-shaped positioning part and a cylinder; the fixing frame is of a frame structure formed by plates. The two bottom positioning plates are disc-shaped plates and are horizontally fixed on the bottom surfaces of the two rectangular spaces respectively; the two V-shaped positioning parts are transversely fixed to the upper middle portion of the front side plate with V-shaped openings facing inwards. The number of the air cylinders is two, and pistons of the air cylinders penetrate through the through holes in the rear side plate to point to the V-shaped openings. The utility model has the beneficial technical effects that the crank curved bar is directly and stably positioned and clamped, the coaxiality of a threaded hole and the curved bar is ensured, the curved bar is prevented from shaking, and the processing quality is ensured.

Description

Technical Field

[0001] The utility model relates to a crank crank rod end thread hole drilling and tapping processing technology, in particular to a crank crank rod end thread hole drilling and tapping processing fixture. Background Art

[0002] The engine crankshaft consists of four main components, namely the left crank, the right crank, the crankshaft and the connecting rod. The left crank and the right crank are of roughly the same shape, both comprising a crank plate and a crank rod; the crank rod is arranged at the center of the crank plate, and a crank shaft through hole is arranged at an eccentric position of the crank plate (see attached). Figure 1 , in the figure, a is the crank plate, b is the crank rod). The left crank and the right crank are connected into one by a crank shaft, and the connecting rod is mounted on the crank shaft, thus forming the engine crankshaft. Usually, the threaded holes at the ends of the crank rods are drilled and tapped before being assembled into the engine crankshaft, and the engine crankshaft is assembled after the processing is completed. The prior art method for drilling and tapping the threaded holes at the ends of the crank rods uses a three-claw disc to clamp the crank plate of the crank (see the attached Figure 2 (In the figure, A is the crank.) A drilling machine or combination machine tool is used to drill the threaded hole at the end of the crankshaft, followed by tapping. Because the crankshaft's crank disk is large in diameter and thin in thickness, while the crankshaft is small in diameter and long, clamping only the crank disk during machining can easily lead to poor coaxiality between the threaded hole at the end of the crankshaft and the crankshaft. Furthermore, unstable clamping can easily cause the crankshaft to wobble, seriously affecting the machining quality of the threaded hole at the end of the crankshaft.

[0003] Obviously, the existing method of drilling and tapping the threaded hole at the crank end has problems such as low coaxiality between the threaded hole and the crank rod and the crank rod shaking, which seriously affects the processing quality of the threaded hole at the crank rod end. Summary of the Invention

[0004] In order to solve the problems of low coaxiality between the threaded hole and the crank rod and the shaking of the crank rod in the existing crank crank rod end threaded hole drilling and tapping processing methods, which seriously affect the processing quality of the crank rod end threaded hole, the utility model proposes a crank crank rod end threaded hole drilling and tapping processing fixture.

[0005] The utility model discloses a fixture for drilling and tapping threaded holes at the end of a crank crank rod, comprising a fixing frame, a bottom positioning frame, a V-shaped positioning frame and a cylinder; the fixing frame is a frame structure composed of plates, comprising a bottom plate, a front side plate, a rear side plate and an intermediate connecting plate; the bottom plate is a rectangular plate; the front side plate and the rear side plate are rectangular plates and have the same length as the bottom plate, and are respectively fixed vertically to the front and rear sides of the bottom plate; the intermediate connecting plate is fixed horizontally and vertically in the middle of the bottom plate, and the two sides are respectively fixedly connected to the front side plate and the rear side plate, thereby forming two rigid rectangular spaces on the left and right; the bottom positioning frame is a circular plate There are two disc-shaped plates, which are horizontally fixed on the bottom surfaces of the two rectangular spaces respectively; there are two V-shaped positioning members and the V-shaped opening is fixed inward and laterally in the middle and upper part of the front side plate, and the axis of the V-shaped opening is coaxial with the axis of the bottom positioning member; the axis of the V-shaped opening refers to the axis of the crankshaft placed in the V-shaped opening and close to the two side edges of the V-shaped opening; there are two cylinders, which are laterally fixed on the outer sides of the rear side plates respectively, and the height is the same as that of the V-shaped positioning member; the piston of the cylinder passes through the through hole on the rear side plate and points to the V-shaped opening, and the vertical radius of the piston is coplanar with the axis of the V-shaped opening.

[0006] Furthermore, a circular inner step is provided on the surface of the bottom positioning disc-shaped plate, and the inner diameter of the inner step matches the outer diameter of the crank disc.

[0007] The beneficial technical effect of the crank crank rod end thread hole drilling and tapping processing fixture of the utility model is that the crank crank rod can be directly positioned and clamped firmly, thereby ensuring the coaxiality of the threaded hole and the crank rod, avoiding the shaking of the crank rod, and ensuring the processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Attachment Figure 1 It is a three-dimensional schematic diagram of the crank;

[0009] Attachment Figure 2 It is a three-dimensional schematic diagram of the crank clamping of the prior art crank crank rod end threaded hole drilling and tapping processing method;

[0010] Attachment Figure 3 It is a three-dimensional schematic diagram of the crank crank rod end thread hole drilling and tapping processing fixture of the utility model;

[0011] Attachment Figure 4 This is a three-dimensional schematic diagram of the crank crank rod end threaded hole drilling and tapping fixture from another angle;

[0012] Attachment Figure 5 It is a three-dimensional schematic diagram of the clamping state of the drilling and tapping processing fixture of the utility model.

[0013] In the figure, 1 is a fixed frame, 2 is a bottom positioning, 3 is a V-shaped positioning, 4 is a cylinder, A is a crank, a is a crank plate, and b is a crank rod.

[0014] The following is a further description of the crank crankshaft end threaded hole drilling and tapping fixture of the present invention in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0015] Referring to the accompanying drawings, the present invention provides a fixture for drilling and tapping threaded holes at the end of a crank crank rod, comprising a fixing frame 1, a bottom positioning frame 2, a V-shaped positioning frame 3 and a cylinder 4; the fixing frame is a frame structure composed of plates, comprising a bottom plate, a front side plate, a rear side plate and an intermediate connecting plate; the bottom plate is a rectangular plate; the front side plate and the rear side plate are rectangular plates with the same length as the bottom plate, and are respectively fixed vertically to the front and rear sides of the bottom plate; the intermediate connecting plate is fixed vertically in the middle of the bottom plate, and its two sides are respectively fixedly connected to the front side plate and the rear side plate, thereby forming two rigid rectangular spaces on the left and right; the bottom The positioning is a disc-shaped plate and there are two of them, which are horizontally fixed on the bottom surfaces of the two rectangular spaces respectively; the V-shaped positioning is two and the V-shaped opening is fixed inward and laterally in the middle and upper part of the front side plate, and the axis of the V-shaped opening is coaxial with the axis of the bottom positioning; the axis of the V-shaped opening refers to the axis of the crank rod placed in the V-shaped opening and close to the two side rear crank rods of the V-shaped opening; there are two cylinders, which are laterally fixed on the outside of the rear side plate respectively, and the height is the same as the V-shaped positioning; the piston of the cylinder passes through the through hole on the rear side plate and points to the V-shaped opening, and the vertical radius of the piston is coaxial with the axis of the V-shaped opening. The present invention is a fixture for drilling and tapping the threaded hole at the end of a crankshaft crankshaft. It adopts the cooperation of V-shaped positioning and cylinder piston to achieve the clamping of the crankshaft. Since the crankshaft crankshaft is directly positioned and clamped, the coaxiality of the clamping is effectively guaranteed. At the same time, the shaking of the crankshaft during processing is avoided. It not only ensures the coaxiality of the threaded hole and the crankshaft, but also avoids the shaking of the crankshaft, thereby effectively ensuring the processing quality of the threaded hole at the end of the crankshaft. During specific processing, the crank is placed on the bottom positioning, the cylinder is turned on, and the cylinder piston moves forward to rest on the crankshaft crankshaft, thereby achieving the positioning and clamping of the crankshaft crankshaft. Since two positioning and clamping mechanisms are provided, two cranks can be processed simultaneously. Both cranks can be drilled at the same time, or one crank can be drilled and the other can be tapped. This effectively improves the processing efficiency and reduces the time for changing tools.

[0016] As one of the preferred technical solutions, the surface of the bottom positioning disc is provided with a circular inner step, the inner diameter of which matches the outer diameter of the crank disc. In this way, when the crank is placed on the bottom positioning, it can achieve preliminary positioning, reducing the need to adjust the crank placement during clamping.

[0017] Obviously, the beneficial technical effect of the crank crank rod end threaded hole drilling and tapping processing fixture of the utility model is to directly position and clamp the crank crank rod firmly, ensure the coaxiality of the threaded hole and the crank rod, avoid the occurrence of crank rod shaking, and ensure the processing quality.

Claims

1. A fixture for drilling and tapping threaded holes at the ends of crankshafts, characterized in that: The processing fixture includes a fixing frame, a bottom positioning, a V-shaped positioning and a cylinder; the fixing frame is a frame structure composed of plates, including a bottom plate, a front side plate, a rear side plate and an intermediate connecting plate; the bottom plate is a rectangular plate; the front side plate and the rear side plate are rectangular plates and have the same length as the bottom plate, and are vertically fixed to the front and rear sides of the bottom plate respectively; the intermediate connecting plate is horizontally and vertically fixed to the middle of the bottom plate, and the two sides are fixedly connected to the front side plate and the rear side plate respectively, thereby forming two rigid rectangular spaces on the left and right; the bottom positioning is a disc-shaped plate and is divided into two, The two V-shaped positioning members are fixed horizontally on the bottom surfaces of the two rectangular spaces; there are two V-shaped positioning members and the V-shaped opening is fixed inward and laterally on the middle and upper part of the front side plate, and the axis of the V-shaped opening is coaxial with the axis of the bottom positioning member; the axis of the V-shaped opening refers to the axis of the crankshaft placed in the V-shaped opening and close to the two side rear crankshafts of the V-shaped opening; there are two cylinders, which are fixed laterally on the outer sides of the rear side plates, and the height is the same as that of the V-shaped positioning member; the piston of the cylinder passes through the through hole on the rear side plate and points to the V-shaped opening, and the vertical radius of the piston is coplanar with the axis of the V-shaped opening.

2. The crankshaft end thread hole drilling and tapping fixture according to claim 1, characterized in that: A circular inner step is provided on the surface of the bottom positioning disc-shaped plate, and the inner diameter of the inner step matches the outer diameter of the crank disc.

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