CN109352360B - Machining method for reducing resonance of invar alloy low-rigidity cantilever part - Google Patents

Abstract

The invention relates to a machining method for reducing resonance of a low-rigidity cantilever part made of invar alloy. The hypotenuses of the two triangular wood wedges are in a concave-convex mode. The invention designs a specific process method aiming at the characteristic that the invar alloy low-rigidity cantilever part is easy to deform to generate resonance, achieves better part surface roughness by the matched use of a tool and a clamp, and completes the processing of the invar alloy low-rigidity cantilever part. The invention has the advantages that: compared with the traditional processing method, the process method overcomes the resonance problem of the fine processing of the parts, has low cost, low rejection rate and short processing period, and is particularly suitable for small-batch production.

Description

Machining method for reducing resonance of invar alloy low-rigidity cantilever part

Technical Field

The invention belongs to a machining manufacturing technology, and relates to a machining method for reducing resonance of a low-rigidity cantilever part made of an invar alloy material.

Background

The invar alloy material has a low-rigidity cantilever part, and the cantilever length of the part is easy to deform, so that the finish machining of the part is easy to generate resonance, the surface roughness quality of the part is poor, the rejection rate is high, the machining effect is not ideal, and the invar alloy is not suitable for single-piece small-batch production; the invention designs a specific process method aiming at the invar alloy low-rigidity cantilever part, solves the problems of part processing, clamping and positioning, material resonance under the action of cutting force and the like by matching the tool and the clamp, and completes the rapid processing of the part.

Disclosure of Invention

Technical problem to be solved

In order to avoid the defects of the prior art, the invention provides a machining method for reducing resonance of an invar alloy low-rigidity cantilever part, and solves the machining problem of reducing resonance of the invar alloy low-rigidity cantilever part during milling.

Technical scheme

A machining method for reducing resonance of invar alloy low-rigidity cantilever parts is characterized by comprising the following steps:

step 1: placing the workpiece on the bench clamp 3, and fixing the bottom of the part 1 by a pressure plate;

step 2: selecting wood, processing two right-angled triangular wood wedges, mutually forming a concave-convex die on two bevel edges, and sanding the contact surfaces of the two wood wedges; the rectangle formed by the two right-angled triangular wood wedges is equal to the size of the rectangle at the upper ends of the bench clamp 3 and the part 1;

and step 3: two triangular wood wedge pads are arranged between a workpiece cantilever and a bench clamp to tightly press a part;

and 4, step 4: machining by adopting an imported hard alloy cutter according to a part drawing, wherein the rotating speed of a main shaft is 2500 during machining, the feed is 500mm/min, the feed is 80mm/min, and the withdrawal is 100 mm/min;

and 5: and after the machining is finished, the pressing plate is detached, and the part cleaning platform is stored.

Advantageous effects

The invention provides a machining method for reducing resonance of a low-rigidity cantilever part made of invar alloy. The hypotenuses of the two triangular wood wedges are in a concave-convex mode.

The invention designs a specific process method aiming at the characteristic that the invar alloy low-rigidity cantilever part is easy to deform to generate resonance, achieves better part surface roughness by the matched use of a tool and a clamp, and completes the processing of the invar alloy low-rigidity cantilever part.

The invention has the advantages that: compared with the traditional processing method, the process method overcomes the resonance problem of the fine processing of the parts, has low cost, low rejection rate and short processing period, and is particularly suitable for small-batch production.

Drawings

FIG. 1: drawing of parts

FIG. 2: schematic diagram of wedge-shaped wood material cushion block female die

FIG. 3: schematic diagram of wedge-shaped wood material cushion block male die

FIG. 4: schematic view of part clamping

Detailed Description

The invention will now be further described with reference to the following examples and drawings:

the part requirements are as follows: the parallelism of two end planes of the cantilever of the part is 0.02, the total length is 455mm, the total height is 270mm, the wall thickness is 10mm, and the roughness is 1.6.

The method comprises the following steps: because resonance phenomenon may occur, in order to avoid the phenomenon before processing, the natural frequency of the invar alloy is calculated, wherein the natural frequency is 2 multiplied by circumference rate multiplied by m/K under the root sign, and the elastic modulus K of the invar alloy is 141GPa, and the formula shows that the natural frequency is only related to the ratio of the density to the elastic modulus of the material under the same volume, and the elastic modulus K of the wood material is basically in the range of 8-12GPa, so that a proper wood material is selected to replace the sizing block;

step two: the wood cushion block is divided into two wood wedges for processing two concave-convex modes which are approximate to a right-angle triangle of 60 degrees, the contact surfaces of the two wood wedges are subjected to sanding treatment to increase friction force so that clamping is more effective, and the concave-convex mode can eliminate cutting influence caused by tool movement;

step two: mounting bench clamps on the lower parts of the workpieces, fixing the bottoms of the parts by using a pressing plate, and cushioning two triangular wood wedges between a workpiece cantilever and the bench clamps to tightly press the parts;

step three: selecting an imported hard alloy cutter for finish machining of a workpiece, grinding a cutter point to be sharp, ensuring that the contact area of the cutter point and a part is small as much as possible, rotating the main shaft at 2500, feeding at 500mm/min, feeding at 80mm/min, and retracting at 100 mm/min;

step four: and after the machining is finished, the pressing plate is detached, and the part cleaning platform is stored.

Claims (1)

1. A machining method for reducing resonance of invar alloy low-rigidity cantilever parts is characterized by comprising the following steps:

step 1: placing a workpiece on the bench clamp (3), and fixing the bottom of the part (1) by a pressure plate;

step 2: selecting wood, processing two right-angled triangular wood wedges, mutually forming a concave-convex die on two bevel edges, and sanding the contact surfaces of the two wood wedges; the rectangle formed by the two right-angled triangular wood wedges is equal to the size of the rectangle at the upper ends of the bench clamp (3) and the part (1);

and step 3: two triangular wood wedge pads are arranged between a workpiece cantilever and a bench clamp to tightly press a part;

and 4, step 4: machining by adopting an imported hard alloy cutter according to a part drawing, wherein the rotating speed of a main shaft is 2500 rpm, the feed is 500mm/min, the feed is 80mm/min, and the withdrawal is 100mm/min during machining;

and 5: and after the machining is finished, the pressing plate is detached, and the part cleaning platform is stored.

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