A clamping tool for electric spark cutting of a crankshaft

Abstract

The application discloses a clamping tool for electric spark cutting of a crankshaft, and relates to the field of engine crankshaft machining equipment. The clamping tool comprises a base, a connecting rod, a V-shaped block, a locking mechanism, a positioning rod, a spring chuck positioning gear, a driving gear and a height adjusting positioning device. The height adjusting positioning device makes the crankshaft more stable during clamping, fully limits the freedom degree, solves the problems of the crankshaft being unable to be positioned and being under-positioned, prevents the crankshaft from being deviated during machining and the like, and improves the safety factor and quality. The locking mechanism can assist in supporting the crankshaft during machining, and can clamp the workpiece after machining is completed, so that the workpiece is prevented from falling. Through reasonable design of the lifting structure and the overall structure of the tool, linear cutting can be directly machined through one programming, time is saved, and efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engine crankshaft processing equipment, in particular to a clamping tool for spark-erosion cutting of a crankshaft. BACKGROUND

[0002] The crankshaft is the most important component in an engine, which bears the force transmitted by the connecting rod, and converts it into torque output and drives other accessories on the engine. The crankshaft is subjected to the combined action of centrifugal force of rotating mass, periodically changing gas inertia force and reciprocating inertia force, so that the crankshaft bears bending and torsional load. In the trial production process of the crankshaft, the crankshaft needs to be subjected to bending fatigue test and metallographic structure analysis before and after heat treatment, and the existing processing method mainly cuts the crankshaft in sections through wire cutting. At present, there is no special dedicated tool for clamping the wire-cutting crankshaft, and the conventional method is to place two Y-directionally movable plates on the main workbench of the wire cutting, adjust the distance between the two plates to form a suitable gap, and use the outer contour of the crankshaft arm to support and fix it on the plate. This processing method has the following safety hazards and quality problems.

[0003] 1. The outer end of the crankshaft arm of the crankshaft is a blank surface and a rough machining surface, and the surface is used as a reference, so that the flatness of the cut section cannot be guaranteed;

[0004] 2. The processing method is under-positioning, which does not comply with the positioning principle of mechanical processing, and the degree of freedom is not enough, which can easily lead to the falling off of the crankshaft, deviation, and cause certain safety hazards;

[0005] 3. The part of the crankshaft that falls off after cutting has a large mass, and when it is in free fall, it can easily damage the workbench, and the large impact force can cause the crankshaft to deform, which can cause certain errors in the subsequent experimental results. SUMMARY

[0006] The present application is aimed at the problems in the prior art, and conceives a clamping tool for spark-erosion cutting of a crankshaft, which makes the crankshaft more stable in clamping through the height-adjusting positioning device, fully limits its degree of freedom, and after processing is completed, the locking mechanism can clamp the workpiece to prevent it from falling off, saving time and improving efficiency.

[0007] The technical scheme adopted in the present application is: a clamping tool for electric spark cutting of a crankshaft, comprising a base 1, V-shaped blocks 3, characterized in that it further comprises a connecting rod 2, a locking mechanism 5, a positioning rod 6, and a height adjustment positioning device 9, trapezoidal grooves are arranged on the upper surface of the base 1, trapezoidal grooves are arranged on the left and right sides of the base 1, trapezoidal blocks are arranged on the lower part of the V-shaped blocks 3, trapezoidal blocks are arranged on the end of the connecting rod 2, two identical V-shaped blocks 3 are arranged on the upper part of the base 1, the trapezoidal blocks of the V-shaped blocks 3 are connected with the trapezoidal grooves on the upper surface of the base 1, the height adjustment positioning device 9 is arranged between the two identical V-shaped blocks 3, the height adjustment positioning device 9 is detachably connected with the base 1, the trapezoidal blocks of the connecting rod 2 are connected with the trapezoidal grooves on the side of the base 1, the connecting rod 2 is connected with the locking mechanism 5 through the positioning rod 6, and the locking mechanism 5 is arranged between the two identical V-shaped blocks 3.

[0008] Further, it further comprises a spring chuck positioning gear 7 and a driving gear 8, the driving gear 8 is movably connected with the V-shaped block 3, a handle is arranged on the outer side of the driving gear 8, the driving gear 8 is meshingly connected with the spring chuck positioning gear 7, the driving gear 8 and the spring chuck positioning gear 7 are connected through a center frame, a spring chuck is arranged on the inner side of the spring chuck positioning gear 7, and the center of the spring chuck positioning gear 7 coincides with the center of the spring chuck.

[0009] Further, the locking mechanism 5 is a handcuff.

[0010] Further, the base 1 is made of HT200.

[0011] Further, the V-shaped block 3 is made of 45# steel.

[0012] Further, the connecting rod 2 is made of Q235.

[0013] Further, the height adjustment positioning device 9 is a spiral elevator.

[0014] Further, the spiral elevator comprises a worm gear, a box body, a bearing and a screw rod.

[0015] The present application has the following beneficial effects:

[0016] 1. A clamping tool for electric spark cutting of a crankshaft, the height adjustment positioning device makes the crankshaft more stable during clamping, fully limits the degree of freedom, makes it comply with the principle of mechanical positioning and clamping, solves the problems of positioning failure and under-positioning of the crankshaft, prevents the crankshaft from deviating during the machining process, and improves the safety factor and quality.

[0017] 2. A clamping fixture for EDM crankshaft, wherein the locking mechanism can provide auxiliary support for the crankshaft during the machining process and can hold the workpiece after machining to prevent it from falling. Through the rational design of the lifting structure and the overall structure of the fixture, wire EDM can be completed directly in one programming, saving time and improving efficiency. Attached Figure Description

[0018] Fig. 1 This is a three-dimensional view of a clamping fixture used for electrical discharge machining of crankshafts;

[0019] Fig. 2 This is a three-dimensional view of a clamping fixture used for EDM crankshaft cutting from another angle.

[0020] Fig. 3 An exploded view of a clamping fixture used for electrical discharge machining of crankshafts;

[0021] In the diagram: 1. Base, 2. Connecting rod, 3. V-block, 4. Crankshaft, 5. Locking mechanism, 6. Positioning rod, 7. Spring collet positioning gear, 8. Drive gear, 9. Height adjustment positioning device. Detailed Implementation

[0022] The following is in conjunction with the appendix Figs. 1-3 The present invention will be further described in detail below with reference to specific embodiments. In order to make the purpose, technical solution and advantages of the embodiments clearer, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings. The specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0023] As attached Figs. 1-3As shown, a clamping tool for electric spark cutting crankshaft, it includes: base 1, connecting rod 2, V block 3, locking mechanism 5, positioning rod 6, spring chuck positioning gear 7, driving gear 8, height adjustment positioning device 9, trapezoidal groove is arranged on the upper surface of the base 1, trapezoidal groove is arranged on the left and right side surfaces of the base 1 respectively, trapezoidal block is arranged on the lower part of the V block 3, trapezoidal block is arranged on one end of the connecting rod 2, two identical V blocks 3 are arranged on the upper part of the base 1, the trapezoidal block of the V block 3 is connected with the trapezoidal groove on the upper surface of the base 1, the height adjustment positioning device 9 is arranged between the two identical V blocks 3, the height adjustment positioning device 9 is detachably connected with the base 1, the trapezoidal block of the connecting rod 2 is connected with the trapezoidal groove on the side surface of the base 1, the connecting rod 2 is connected with the locking mechanism 5 through the positioning rod 6, the locking mechanism 5 is arranged between the two identical V blocks 3, the driving gear 8 is movably connected with the V block 3, a handle is arranged on the outer side of the driving gear 8, the driving gear 8 is meshingly connected with the spring chuck positioning gear 7, the driving gear 8 and the spring chuck positioning gear 7 are connected through a center frame, a spring chuck is arranged on the inner side of the spring chuck positioning gear 7, the center of the spring chuck positioning gear 7 coincides with the center of the spring chuck, the locking mechanism 5 is a handcuff, the base 1 is made of HT200, the V block 3 is made of 45 steel, the connecting rod 2 is made of Q235, and the height adjustment positioning device 9 is a spiral elevator.

[0024] A clamping tool for electric spark cutting crankshaft specific operation steps:

[0025] Place the base 1 on the workbench of electric spark wire cutting as support, position the two shaft heads of the crankshaft 4 with the V block 3 respectively, clamp one shaft head of the crankshaft 4 through the spring chuck, shake the handle on the outer side of the driving gear 8, adjust the height of the crank portion of the crankshaft 4, adjust the height of the height adjustment positioning device 9 to support and position the crank of the crankshaft 4, after the crankshaft 4 is fixed, adjust the position of the connecting rod 2, position the height of the positioning rod 6, lock the shaft diameter of the crankshaft 4 with the locking mechanism 5, so that the connecting rod neck angle of the crankshaft 4 always faces one direction, and the wire adjusting times can be reduced.

[0026] The above only is the preferred mode of the present application, it should be pointed out that, for ordinary skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A fixture for chucking a crankshaft for electrical discharge machining, comprising: The base (1), V-shaped block (3), characterized in that it further comprises: connecting rod (2), locking mechanism (5), positioning rod (6), height adjustment positioning device (9), trapezoidal groove is arranged on the upper surface of the base (1), trapezoidal groove is arranged on the left and right side surfaces of the base (1) respectively, trapezoidal block is arranged on the lower part of the V-shaped block (3), trapezoidal block is arranged on one end of the connecting rod (2), two identical V-shaped blocks (3) are arranged on the upper part of the base (1) respectively, the trapezoidal block of the V-shaped block (3) is matched and connected with the trapezoidal groove on the upper surface of the base (1), the height adjustment positioning device (9) is arranged between the two identical V-shaped blocks (3), the height adjustment positioning device (9) is detachably connected with the base (1), the trapezoidal block of the connecting rod (2) is matched and connected with the trapezoidal groove on the side surface of the base (1), the connecting rod (2) is connected with the locking mechanism (5) through the positioning rod (6), and the locking mechanism (5) is arranged between the two identical V-shaped blocks (3).

2. A jigging tool for electric spark cutting of a crankshaft according to claim 1, wherein It further comprises: spring chuck positioning gear (7), driving gear (8), the driving gear (8) is movably connected with the V-shaped block (3), a handle is arranged on the outer side of the driving gear (8), the driving gear (8) is meshed and connected with the spring chuck positioning gear (7), the driving gear (8) and the spring chuck positioning gear (7) are connected through a center frame, a spring chuck is arranged on the inner side of the spring chuck positioning gear (7), and the center of the spring chuck positioning gear (7) coincides with the center of the spring chuck.

3. The jigging tool for electric discharge cutting of a crankshaft according to claim 1, wherein The locking mechanism (5) is a handcuff.

4. The jigging tool for electric spark cutting of a crankshaft according to claim 1, wherein The base (1) is made of HT200.

5. The jigging tool for electric discharge cutting of a crankshaft according to claim 1, wherein The V-shaped block (3) is made of 45# steel.

6. The tool holder for electric discharge machining of a crankshaft as set forth in claim 1, wherein The connecting rod (2) is made of Q235.

7. The tooling fixture for electric discharge machining of a crankshaft as set forth in claim 1, wherein, The height adjustment positioning device (9) is a spiral elevator.

8. A jigging tool for electric spark cutting of a crankshaft according to claim 7, wherein The spiral elevator comprises: A worm wheel, a worm, a box body, a bearing and a lead screw.

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