CN103273518A - Evanescent mode numerical control machined thin type blade - Google Patents

Abstract

The lost foam CNC machining thin blade includes a blade body. The blade body includes a fixed piece with a mounting hole and a cutting piece with a front cutting edge. The upper end of the cutting piece is fixed on the lower surface of the fixed piece. ; The blade body is fixed in the slot on the side wall of the milling cutter body by screws, and the front cutting edge of the cutting piece protrudes from the bottom surface of the milling cutter body, the cross-sectional shape of the slot It is matched with the cross-sectional shape of the blade body; the connection through hole provided in the center of the milling cutter body is connected with the negative pressure chip suction device. The beneficial effects of the invention are: 1) convenient production and maintenance; 2) low production cost, good cutting performance; convenient installation and disassembly; 3) the front blade faces the bottom surface, which is more convenient to realize negative pressure chip suction than the blade installed on the side, and It is easy to clean the waste chips near the cutting edge and cool the blade. The thermal conductivity of the foam material is low, which can effectively prevent the foam chips from sticking to the cutting edge due to the heat of cutting and affect the processing quality of the workpiece.

Description

Lost foam CNC machining thin blade

technical field

The invention relates to a thin blade for CNC machining of lost foam.

Background technique

Due to its high casting precision, flexible design and green and efficient production process, the lost foam casting technology has developed rapidly all over the world in the past two decades. At present, the actual lost foam foam pattern processing methods mainly include manual cutting, mold foaming and numerical control processing. The manual cutting method is flexible in operation and low in investment. It is widely used in simple model cutting and complex model rest, but its manufacturing accuracy and production efficiency are very low. The use of mold foam molding is currently the most important production method for producing foam patterns, but it needs to first design and process a metal mold according to the shape of the target part, and then heat and foam the foam beads in the metal mold. This processing method mold The design is cumbersome and expensive. If the shape of the part to be processed changes slightly, the mold must be redesigned, and the production adaptability is very poor. CNC machining has the characteristics of high efficiency, high precision, and high processing flexibility. It is not only suitable for large-scale production, but also suitable for single-piece small-batch production and new product development.

Generally, when CNC machining is used to cut metal materials, the rake face of the blade squeezes the cut metal layer at the cutting point to produce shear slip deformation to complete the cutting. Milling cutters for processing general metals, the rake angle is 5°~10°, and the rear angle is 1°~5°. When cutting foam, the blade is pressed against the cut foam at the cutting point to make the small balls on the foam elastic. Deformation, due to the small rake angle of the blade, the extrusion force is much greater than the shear force, so that the balls on the foam on the blade can not be sheared and broken after elastic deformation, resulting in peeling of beads, network-like protrusions, and fluff-like roughness , nicks, corrugations, etc. If the traditional metal CNC milling cutter is used for cutting, the surface quality of the foam pattern is poor, which cannot meet the precision requirements of lost foam casting.

Production cost is an important consideration in tool design and selection. To achieve both economy and rationality of processing technology, the material and structure of the tool must be reasonably selected to ensure that the tool has sufficient strength and rigidity to ensure the machining accuracy of the workpiece. Ensure reasonable durability, ensure the convenience of sharpening, etc. At present, there are foam end mills and disc mills similar to metal cutting tools on the market. They generally improve the rake angle and helix angle, and grind the blade It is sharper, and the price of a single tool is generally several hundred yuan; the price of milling blades for processing metal materials generally ranges from a few yuan to tens of yuan. If it is improved into a sharp-edged blade for processing foam materials, the price will be even higher. , and their cutting edge is short, the cutting efficiency is low, and it is not brisk, while the price of ordinary plastic cutting machine carbon steel industrial blades is only a few cents; and when the milling cutter rotates at high speed, the blade is directly embedded in the The method on the milling cutter body is not reliable enough, and the insert may break away from the milling cutter body or become loose due to the influence of centrifugal force, so additional auxiliary clamping measures are required. Foam is a relatively soft material. In addition, it adopts the cutting mode of small depth of cut, small step distance, fast feed, and high speed. The rigidity requirements of the tool system are far lower than those of metal processing. Find a simple and suitable clamping method to meet the rigidity requirements of the tool system.

Contents of the invention

In order to solve the problems of soft materials, low thermal conductivity and easy deformation of the current processing blades during the cutting process, the present invention proposes a method that can ensure high surface quality after CNC machining of the lost foam pattern and reduce the production cost of the processing tools. , It is convenient and stable to clamp and fix the blade and make the blade have a certain rigidity when cutting. The lost foam CNC machining thin blade.

The thin blade for EPC machining according to the present invention is characterized in that it includes a blade body, the blade body includes a fixed piece with a mounting hole, a cutting piece with a front edge, and the upper end of the cutting piece is fixed On the lower surface of the fixed piece; the blade body is fixed in the slot on the side wall of the milling cutter body by screws, and the front cutting edge of the cutting piece protrudes from the bottom surface of the milling cutter body, The cross-sectional shape of the slot matches the cross-sectional shape of the blade body; the connecting through hole provided in the center of the milling cutter body is connected to the negative pressure chip suction device.

The milling cutter body is evenly provided with several slots along the circumference, and each slot is provided with an internal thread through hole at a corresponding position.

The included angle between the fixing piece and the cutting piece is an acute angle.

When the insert body is installed in the slot, the included angle between the cutting piece and the vertical axis of the milling cutter body is 60 degrees.

The threadless section in the middle of the screw divides the threaded section of the screw into upper and lower parts, and the threadless section matches the mounting hole on the fixing piece.

The thickness of the blade body is 0.3mm-0.5mm.

When in use, insert the blade body into the corresponding slot, and then fix it with screws. The unthreaded section on the screw fits closely with the mounting hole on the blade body; the cutting piece of the blade body is at an angle of 60° to the vertical axis, and the blade The body has a large rake angle and is very sharp, which reduces the extrusion force between the front blade and the cut foam ball at the cutting point, reduces the elastic deformation of the ball on the foam, and increases the shear force, causing the foam ball to be cut. Cutting off, splitting into two, and jumping off from the blade, the probability of the ball being torn off as a whole becomes smaller, so that the surface to be cut is smooth.

The beneficial effects of the present invention are: 1) the blade is a thin blade similar to an industrial blade for cutting plastics, and has a greater price advantage in the production and maintenance of milling cutters; 2) the production cost is low, and it is easy to realize sharp Cutting performance; when installing the blade, just insert the blade into the slot from the side correspondingly. In order to make the installation more stable, a screw that is easy to disassemble will be set to fix the blade; when the blade is damaged or deformed, etc. 3) When the insert is clamped on the milling cutter body, the front cutting edge faces the bottom surface, which is more convenient than the insert installed on the side to achieve negative pressure chip suction, and it is convenient to clean the waste near the cutting edge , Cooling the blade, the thermal conductivity of the foam material is low, which can effectively prevent the foam chip from being bonded to the cutting edge by the cutting heat and affecting the processing quality of the workpiece.

Description of drawings

Fig. 1 is a structural diagram of the present invention.

Fig. 2 is a structural view of the blade body of the present invention.

Fig. 3 is a structural diagram of the screw thread of the present invention.

Fig. 4 is a schematic diagram of the installation of the insert body and the milling cutter body of the present invention.

Figure 5 is a top view of the present invention.

Figure 6 is a side view of the present invention.

Fig. 7 is a structural view of the milling cutter body of the present invention.

Detailed ways

Further illustrate the present invention below in conjunction with accompanying drawing

Referring to the attached picture:

The lost foam CNC machining thin blade of the present invention includes a blade body 1, and the blade body 1 includes a fixed piece 11 having a mounting hole 111, a cutting piece 12 with a front cutting edge, and the cutting piece 12 The upper end is fixed on the lower surface of the fixed piece 11; the blade body 1 is fixed in the slot 31 on the side wall of the milling cutter body 3 by a screw 2, and the front edge of the cutting piece 12 protrudes from the The bottom surface of the milling cutter body 3, the cross-sectional shape of the slot 31 matches the cross-sectional shape of the blade body 1; the connecting through hole 32 provided in the center of the milling cutter body 3 is connected chip device.

The milling cutter body 3 is evenly provided with several slots 31 along the circumference, and each of the slots 31 is provided with an internal thread through hole 311 at a corresponding position.

The included angle between the fixing piece 11 and the cutting piece 12 is an acute angle.

When the insert body 1 is installed in the slot 31, the angle between the cutting piece 12 and the vertical axis of the milling cutter body 3 is 60 degrees.

The threadless section 21 in the middle of the screw 2 divides the threaded section of the screw 2 into upper and lower parts, and the threadless section 21 matches the mounting hole 111 on the fixing piece 11 .

The thickness of the blade body 1 is 0.3mm-0.5mm.

When in use, insert the blade body 1 into the corresponding slot 31, and then fix it with a screw 2. The unthreaded section 21 on the screw 2 is closely matched with the mounting hole 111 on the blade body 1; The direction of the straight axis is at an angle of 60°, and the blade has a large rake angle, which is very sharp, so that the extrusion force between the front blade and the cut foam ball at the cutting point is reduced, and the elastic deformation of the foam ball is reduced. As the force increases, the foam ball is cut off, split into two, and jumps off from the blade. The probability of the ball being torn off as a whole becomes smaller, thereby making the surface to be cut smooth.

The content described in the embodiments of this specification is only an enumeration of the implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments. The protection scope of the present invention also includes those skilled in the art. Equivalent technical means conceivable according to the concept of the present invention.

Claims (6)

1. Lost foam numerical control processing thin blade, it is characterized in that: comprise blade body, described blade body comprises the fixed piece that has mounting hole, the cutting piece that has front cutting edge, the upper end of described cutting piece is fixed on the described The lower surface of the fixed piece; the blade body is fixed in the slot on the side wall of the milling cutter body by screws, and the front cutting edge of the cutting piece protrudes from the bottom surface of the milling cutter body, and the The cross-sectional shape of the slot matches the cross-sectional shape of the blade body; the connecting through hole provided in the center of the milling cutter body is connected to the negative pressure chip suction device. 2. The thin blade for EPC machining according to claim 1, characterized in that: the milling cutter body is evenly provided with several slots along the circumference, and each slot corresponding to the position is provided with an internal thread through hole. 3. The thin blade for EPC machining according to claim 2, characterized in that: the angle between the fixed piece and the cutting piece is an acute angle. 4. The thin blade for lost foam numerical control machining according to claim 3, wherein when the blade body is installed in the slot, the vertical distance between the cutting piece and the milling cutter body The angle between the axes is 60 degrees. 5. The thin blade for lost foam numerical control machining according to claim 4, characterized in that: the threadless section in the middle of the screw divides the threaded section of the screw into upper and lower parts, and the threadless section The segments match the mounting holes on the fixed plate. 6. The thin blade for NC machining according to claim 1, characterized in that: the thickness of the blade body is 0.3mm-0.5mm.

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