Numerical control blade dry sand blasting passivation device and method

Abstract

The invention belongs to the technical field of numerical control blade machining, and particularly relates to a numerical control blade dry sand blasting passivation device and method. The device comprises a shell, a sand blasting working area is arranged in the middle of the shell, a feeding area and a discharging area are arranged on the two sides of the sand blasting working area respectively, a conveying mechanism is arranged in the shell to convey a blade to be subjected to sand blasting, the conveying mechanism penetrates through the interior of the shell and extends to the discharging area from the feeding area, a cross beam is arranged in the sand blasting working area, and the lower end of the cross beam is connected with a sand blasting device. The sand blasting device comprises a support, a compression spring and a spray gun, and a sand conveying device and a vibrating screen are further arranged outside the shell. The device is simple in structure and convenient to operate, a blade to be subjected to sand blasting is subjected to sand blasting in the process of conveying the blade to be subjected to sand blasting from a feeding area to a discharging area, aluminum oxide sand can be recycled, the cutting edge K value can be controlled by controlling parameters such as the angle and the height of a spray gun through an adjusting bolt in a compression spring, the fluctuation range of the cutting edge K value can be reduced, and the working efficiency is improved. And the sand blasting process is greatly optimized, and treatment of different cutting edges is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of numerical control blade processing, and in particular relates to a numerical control blade dry sandblasting passivation device and method. Background Art

[0002] Cemented carbide is an alloy material made of hard compounds of refractory metals and bonding metals through powder metallurgy. Because of its high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance and other excellent properties, it is widely used as a tool material, such as turning tools, milling cutters, planers, drill bits, boring tools, etc., for cutting cast iron, non-ferrous metals, plastics, chemical fibers, graphite, glass, stone and other difficult-to-process materials. The main production process of cutting blades consists of mixing, pressing, sintering, grinding, coating and other processes. Because the blade edge after being sharpened by ordinary grinding wheel or diamond grinding wheel has microscopic gaps of varying degrees. During the cutting process, the microscopic gaps on the blade edge are very easy to expand, accelerating the wear and damage of the tool. In the production process of blades, in order to improve the service life and cutting performance of the blade, the blade is usually required to be passivated.

[0003] At present, the commonly used edge treatments for cemented carbide CNC blades include dry sandblasting edge treatment, wet sandblasting edge treatment and grinding. Dry sandblasting uses aluminum oxide raw materials and sprays aluminum oxide sand onto the blade edge through high-pressure compressed air. Through the impact and friction of aluminum oxide, the blade edge becomes smooth, burrs and impurities are removed, and the blade edge is passivated. This method has the following shortcomings. Domestic cemented carbide blade manufacturers use manual simple dry sandblasting machines. Place the tool in a tray or fixture, the operator holds the spray gun with his hand, aims at the blade to be sandblasted, and sandblasts. If the sandblasting operation needs to be stopped, the stop button needs to be started with the help of the foot. A large amount of dust will be generated during the sandblasting process, which has a certain impact on the environment and the health of the operator. Since the intensity and angle of the sandblasting are difficult to be completely consistent, the degree of blade edge passivation may be uneven. The wet sandblasting method uses aluminum oxide sand and water as raw materials. It also uses high-pressure compressed air to spray the mixture of aluminum oxide and water onto the blade surface to achieve the purpose of edge treatment. This method has the following shortcomings: aluminum oxide sand and water are mixed together after wet sandblasting, and need to be separated and processed, which increases the complexity of operation. The blade material is sensitive to water, which may cause other adverse chemical reactions on the blade surface. Secondly, the equipment is expensive, and the wet sandblasting working conditions are poor, which brings great inconvenience to equipment maintenance and repair. The blade grinding treatment uses a specific fixture to place the blade in the fixture, and uses a high-speed grinding wheel to squeeze the blade to remove the blade cutting edge material and achieve edge passivation. This method has the following shortcomings: the wear of the wire brush will cause the edge shape to deviate, and the consistency of its edge passivation is difficult to ensure; the edge treatment efficiency is low, and excessive pressure will burn the edge; the operator needs to have high operating skills; the manufacturing precision requirements are high, and the spindle and the grinding wheel need to be closely matched; it is not suitable for large-scale production, and heat will be generated during the grinding process, which may affect the hardness and performance of the blade. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the main purpose of the present invention is to propose a CNC blade dry sandblasting passivation device and method to solve the problems of uneven cutting edge and cutting edge gap of CNC blades during sandblasting, ensure that the cutting edge of CNC blades is uniform during sandblasting, thereby reducing the fluctuation of blade cutting edge K value and improving the cutting life of the tool.

[0005] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0006] A CNC blade dry sandblasting passivation device, the device comprises a shell, the middle part of the shell is a sandblasting work area, the two sides of the sandblasting work area are respectively provided with a feeding area and a discharging area, a conveying mechanism is provided in the shell to convey the blade to be sandblasted, the conveying mechanism runs through the inside of the shell and extends from the feeding area to the discharging area; a filter screen is provided below the conveying mechanism, and a collecting bin is provided below the filter screen;

[0007] A crossbeam is provided in the sandblasting work area, a sandblasting device is connected to the lower end of the crossbeam, the sandblasting device comprises a bracket, a compression spring and a spray gun, the bracket comprises an upper bracket and a lower bracket, the compression spring connects the upper bracket and the lower bracket, an adjusting bolt is provided in the compression spring, a first connecting plate is hingedly connected to the outer edge of the upper bracket, a second connecting plate is hingedly connected to the outer edge of the lower bracket, the first connecting plate and the second connecting plate are hingedly connected, the spray gun is fixedly arranged on the second connecting plate, the spray gun is connected to a sand pipe and an air pipe, and the air pipe is connected to an external compressed air system;

[0008] A sand feeding device and a vibrating screen are also provided outside the shell, the sand feeding device includes a conveyor, a sand feeding port is provided at the bottom of the conveyor, a sand feeding pipe is provided at the top of the conveyor and is connected to the vibrating screen, a screen is provided inside the vibrating screen, a material pipe is provided at the bottom of the vibrating screen, the material pipe is connected to the sand pipe of the spray gun, a dust collector is connected to the top of the vibrating screen, a first dust collecting pipe connected to the sand blasting working area is provided on the dust collector, the dust collector is also connected to a negative pressure exhaust system pipe, and the negative pressure exhaust system pipe is connected to a waste sand collection bin.

[0009] As a preferred solution of the CNC blade dry sandblasting passivation device described in the present invention, a purge working area is also provided between the sandblasting working area and the discharging area, an air gun is provided in the purge working area, and a second dust collection pipe is provided in the purge working area connected to a negative pressure exhaust system pipe, and the negative pressure exhaust system pipe is connected to a waste sand collection bin through a waste sand recovery pipe.

[0010] As a preferred solution of the CNC blade dry sandblasting passivation device described in the present invention, the conveying mechanism is a conveyor belt.

[0011] As a preferred solution of a CNC blade dry sandblasting passivation device described in the present invention, guardrails are provided on both sides of the conveying mechanism in the discharge area, brackets are provided on the guardrails, a cylinder is provided under the filter, the cylinder passes through the filter, and a top plate is provided on the cylinder.

[0012] As a preferred solution of the CNC blade dry sandblasting passivation device described in the present invention, a demagnetization device is provided in the feeding area and the discharging area, and the demagnetization device is a U-shaped demagnetizer with a heat sink on the top.

[0013] As a preferred solution of the CNC blade dry sandblasting passivation device described in the present invention, wherein: a sand screening mesh is provided in the vibrating screen, and a magnet is also provided in the vibrating screen.

[0014] As a preferred solution of a CNC blade dry sandblasting passivation device described in the present invention, wherein: a control panel is connected to the shell, a control module is arranged in the shell, and the control module is electrically connected to a transmission mechanism, a conveyor, a vibrating screen, a dust collector, an adjusting bolt, a control panel, an external compressed air system, and a negative pressure exhaust system pipe.

[0015] To solve the above technical problem, according to another aspect of the present invention, the present invention provides the following technical solution:

[0016] A method for dry sandblasting passivation of a CNC blade, using the above-mentioned dry sandblasting passivation device for a CNC blade to perform dry sandblasting passivation on the blade, comprises the following steps:

[0017] S1. Place the blade to be sandblasted on a tray, and place the tray on a conveyor mechanism in the feed area;

[0018] S2, turning on the conveying mechanism, the sand feeding device, the vibrating screen and the sand blasting device, and the sand blasting device blasts the blade to be sandblasted;

[0019] S3, the material tray moves to the discharging area for unloading.

[0020] As a preferred embodiment of the dry sandblasting passivation method for CNC blades described in the present invention, in which: in step S2, the angle and height of the spray gun are adjusted by compressing the adjusting bolt in the spring, and the pressure of the spray gun is adjusted by controlling the compressed air in the air pipe, wherein the angle of the spray gun is based on the horizontal plane, and the height of the spray gun is based on the distance from the spray gun to the surface of the blade to be sandblasted.

[0021] As a preferred solution of the dry sandblasting passivation method for a CNC blade described in the present invention, the spray gun angle is controlled at 70° to 90°, the spray gun pressure is controlled at 4.5 bar to 6.3 bar, and the spray gun height is controlled at 40-80 mm.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. The device of the present invention has a simple structure and is easy to operate. Sandblasting is performed when the sandblasting blade is sent from the feeding area to the discharging area. The angle, height and other parameters of the spray gun are controlled by compressing the adjusting bolt in the spring to control the K value of the cutting edge, which can reduce the fluctuation range of the K value of the cutting edge, greatly optimize the sandblasting process, and realize the processing of different cutting edges.

[0024] 2. The device of the present invention can effectively recover the ejected alumina sand to ensure its recycling.

[0025] 3. The device of the present invention is also provided with a dust collection system, which can improve the sandblasting dust environment.

[0026] 4. The device is used for sandblasting to make the cutting edge and remove the sticking boat, sintering marks and burrs caused by sintering, which can ensure a certain cobalt content on the blade surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0028] Figure 1 It is a structural schematic diagram from one perspective of a CNC blade dry sandblasting passivation device in an embodiment of the present invention.

[0029] Figure 2 It is a structural schematic diagram from another perspective of the CNC blade dry sandblasting passivation device in an embodiment of the present invention.

[0030] Figure 3 It is a front view of a CNC blade dry sandblasting passivation device in an embodiment of the present invention (some components are not shown).

[0031] Figure 4 It is a schematic structural diagram of a sandblasting device in a CNC blade dry sandblasting passivation device in an embodiment of the present invention.

[0032] Figure 5 Schematic diagram of the structure of the discharge area of ​​the CNC blade dry sandblasting passivation device in an embodiment of the present invention.

[0033] Figure 6 Schematic diagram of the structure inside the vibrating screen of the CNC blade dry sandblasting passivation device in an embodiment of the present invention.

[0034] In the figure: 1-motor, 2-housing, 3-discharging door, 4-discharging area, 5-purging work area, 6-sandblasting work area, 7-control panel, 8-feeding area, 9-control cabinet, 10-material pipe, 11-vibrating screen, 12-sand adding port, 13-new sand adding chamber, 14-conveyor, 15-sand feeding pipe, 16-waste sand pipe, 17-negative pressure exhaust system pipe, 18-first dust collecting pipe, 19-second dust collecting pipe, 20-dust collector, 21-fixed bracket, 22-collecting silo; 23-waste sand recovery pipe; 24-waste sand collection bin; 25-exhaust fan, 26-waste sand Outlet, 101-sandblasting device, 102-crossbeam, 103-compression spring, 104-adjusting bolt, 105-upper bracket, 106-lower bracket, 107-spray gun, 108-first connecting plate, 109-second connecting plate, 110-air pipe, 111-sand pipe, 201-transmission mechanism, 202-pulley, 203-bearing, 204-filter, 205-guardrail, 206-bracket, 207-cylinder, 208-top plate; 209-U-type demagnetizer, 210-demagnetization controller, 211-radiator, 301-sand filter, 302-magnet.

[0035] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] According to one aspect of the present invention, the present invention provides the following technical solution:

[0038] As a specific example, see Figures 1 to 4 A CNC blade dry sandblasting passivation device, the device comprises a shell 2, the middle part of the shell 2 is a sandblasting work area 6, the two sides of the sandblasting work area 6 are respectively provided with a feeding area 8 and a discharging area 4, a conveying mechanism 201 is provided in the shell 2 to convey the blade to be sandblasted, the conveying mechanism 201 runs through the inside of the shell 2 and extends from the feeding area 8 to the discharging area 4; a filter screen 204 is provided below the conveying mechanism 201, and a collecting bin 22 is provided below the filter screen 204;

[0039] A crossbeam 102 is provided in the sandblasting work area 6, and a sandblasting device 101 is connected to the lower end of the crossbeam 102. The sandblasting device 101 includes a bracket, a compression spring 103 and a spray gun 107. The bracket includes an upper bracket 105 and a lower bracket 106. The compression spring 103 connects the upper bracket 105 and the lower bracket 106. An adjusting bolt 104 is provided in the compression spring 103. A first connecting plate 108 is hinged on the outer edge of the upper bracket 105, and a second connecting plate 109 is hinged on the outer edge of the lower bracket 106. The first connecting plate 108 and the second connecting plate 109 are hinged (a plurality of first connecting plates 108 are hinged on the outer edge of the upper bracket 105, and a plurality of second connecting plates 109 are hinged on the outer edge of the lower bracket 106. The first connecting plate 108 and the second connecting plate 109 in the same orientation are hinged, and the structure is more stable). The spray gun 107 is fixedly arranged on the second connecting plate 109 (as a fixing method, it can be fixed by binding with a strap, Figure 4 The spray gun 107 is connected to a sand pipe 111 and an air pipe 110, and the air pipe 110 is connected to an external compressed air system (the external compressed air system is a compressed air system in the workshop, not shown in the figure);

[0040] A sand feeding device and a vibrating screen 11 are also provided outside the shell 2. The sand feeding device includes a conveyor 14. The bottom of the conveyor 14 is a new sand adding chamber 13, and the outside of the conveyor 14 is provided with a sand adding port 12. The top of the conveyor 14 is provided with a sand feeding pipe 15 connected to the vibrating screen 11. The vibrating screen 11 is provided with a sand screening mesh. The bottom of the vibrating screen 11 is provided with a material pipe 10, and the material pipe 10 is bent upward and extended to be connected to a sand pipe 111 of the spray gun 107. A dust collector 20 is connected to the top of the vibrating screen 11. The dust collector 20 is fixed by a fixed bracket 21. The dust collector 20 is provided with a first dust collecting pipe 18 connected to the sand blasting work area 6. The upper end of the dust collector 19 is connected to the negative pressure exhaust system pipe 17 through a waste sand pipe, and the negative pressure exhaust system pipe is connected to the waste sand collection bin 24.

[0041] In the device, the spray gun 107 is connected with a sand pipe 111 and an air pipe 110, and the two pipes are merged in the spray gun 107. The spray gun 107 uses the negative pressure of compressed air to suck the aluminum oxide sand in the vibrating screen 11 into the spray gun 107 through the sand pipe 111, and then blasts the sand onto the surface of the cemented carbide blade together with the compressed air. In the device, the upper bracket 105 and the lower bracket 106 are connected by the first connecting plate 108 and the second connecting plate 109. The tightness of the compression spring 103 can be adjusted by adjusting the bolt 104, and the hinge angle of the first connecting plate 108 and the second connecting plate 109 can be changed to adjust the height, angle and other parameters of the spray gun 107 to achieve different requirements and purposes of edge treatment. The device is also provided with a dust collector 20 (which can be a cyclone dust collector), and the dust in the sandblasting work area 6 is sucked into the dust collector 20. After part of the aluminum oxide sand after sandblasting passes through the cyclone dust collection, the coarse sand falls to the vibrating screen 11, and the fine sand is sucked into the negative pressure exhaust system pipe 17, and then sent to the waste sand collection bin 24 through the negative pressure exhaust system pipe 17. The remaining aluminum oxide coarse sand in the sandblasting work area 6 that can be directly recycled falls to the collection bin 22 and is then transported to the new sand adding chamber 13 through the motor 1. The newly added aluminum oxide sand and the aluminum oxide sand in the collection bin 22 are sent to the vibrating screen 11 through the conveyor 14, mixed with part of the aluminum oxide recovery sand after sandblasting, and then recycled after screening by the vibrating screen 11, so as to realize the recycling of aluminum oxide sand.

[0042] Preferably, a purge work area 5 is further provided between the sandblasting work area 6 and the discharging area 4, an air gun is provided in the purge work area 5, a second dust collecting duct 19 is provided in the purge work area 5 and connected to the negative pressure exhaust system pipe 17, and the negative pressure exhaust system pipe 17 is connected to the waste sand collection bin 24 through the waste sand recovery pipe 23. The purge work area 5 can be provided to achieve the purpose of purging the aluminum oxide sand on the surface of the blade, the waste sand collection bin 24 recycles the waste sand in the negative pressure exhaust system pipe 16, an exhaust fan 25 is provided at the top of the waste sand collection bin 24, and a waste sand outlet 26 is provided at the bottom.

[0043] Preferably, the conveying mechanism 201 is a conveyor belt, see Figure 5 Both ends of the conveyor belt are connected by a pulley 202 and a bearing 203. The aluminum oxide sand in the sandblasting process can enter the collection bin 22 for recycling after passing through the filter screen 204.

[0044] Preferably, guardrails 205 are provided on both sides of the conveying mechanism 201 in the discharge area 4, and brackets 206 are provided on the guardrails 205. A cylinder 207 is provided below the filter 204, and the cylinder 207 is provided through the filter 204, and a top plate 208 is provided on the cylinder 207. After the blade is sandblasted, it reaches the discharge area 4, and the cylinder 207 and the top plate 208 can realize the up and down movement of the material tray. As a preferred embodiment, if no material tray is sensed, the top plate 208 does not move, and the material tray reaches the discharge area 4, and the cylinder lifts it to the bracket 206. If it is sensed that there is still a material tray below the discharge area 4, the top plate rises to block the subsequent material tray until the material tray in the discharge area 4 is lifted to the bracket 206. Then the top plate drops to its original position, and the material tray is sent out from the discharge door 3 and continues to be transported backward.

[0045] Preferably, a demagnetization device is provided in the feed area 8 and the discharge area 4. Figure 4 The demagnetization device is a U-shaped demagnetizer 209, a heat sink 211 is provided on the top, and a demagnetization controller 210 is provided on the outside of the corresponding shell of the feed area 8 and the discharge area 4. The demagnetization device can remove the magnetism of the blade, and the demagnetization value is less than 0.6mT. Impurities will not adhere to the blade during the subsequent surface treatment and cleaning process.

[0046] Preferably, a sand filter 301 is provided in the vibrating screen 11, and a magnet 302 is also provided in the vibrating screen 11. As a preferred embodiment, the device is provided with a 100-mesh sand filter, which is used to filter out foreign matter larger than 84 microns in the alumina sand, such as sand bags containing alumina sand, rubber bands for tying alumina sand bags, screws used in the equipment, etc., to improve the purity of the sandblasting material, intercept impurities in the sandblasting material, improve the sandblasting quality, and ensure that the internal components of the sandblasting machine are not damaged by impurities.

[0047] Preferably, the housing 2 is connected with a control panel 7, and a control module (which can be arranged in a control cabinet 9) is arranged inside the housing 2, and the control module is electrically connected to the transmission mechanism 201, the conveyor 14, the vibrating screen 11, the dust collector 20, the adjusting bolt 104, the control panel 7, the compressed air system, and the negative pressure system pipe 17. The control module adopts a Siemens S7-300 PLC, and the entire control system is constructed by pressing the touch screen / PLC mode.

[0048] According to another aspect of the present invention, the present invention provides the following technical solution:

[0049] A method for dry sandblasting passivation of a CNC blade, using the above-mentioned dry sandblasting passivation device for a CNC blade to perform dry sandblasting passivation on the blade, comprises the following steps:

[0050] S1. Place the blade to be sandblasted on a tray, and place the tray on a conveyor mechanism in the feed area;

[0051] S2, turning on the conveying mechanism, the sand feeding device, the vibrating screen and the sand blasting device, and the sand blasting device blasts the blade to be sandblasted;

[0052] S3, the material tray moves to the discharging area for unloading.

[0053] Preferably, in step S2, the angle and height of the spray gun are adjusted by compressing the adjusting bolt in the spring, and the pressure of the spray gun is adjusted by controlling the compressed air in the air pipe, wherein the angle of the spray gun is based on the horizontal plane, and the height of the spray gun is based on the distance from the spray gun to the surface of the blade to be sandblasted.

[0054] Preferably, the spray gun angle is controlled at 70° to 90°, the spray gun pressure is controlled at 4.5 bar to 6.3 bar, and the spray gun height is controlled at 40 mm to 80 mm.

[0055] The technical solution of the present invention is further described below in conjunction with specific embodiments.

[0056] Example 1

[0057] Place the installed carbide CNC blades on the conveyor belt in the loading area, and select the spray gun angle at 70°, 80°, or 90°.

[0058] Only the spray gun angle is changed, and the same type of cemented carbide CNC blade is sandblasted. The K value of the cutting edge under different spray gun angles is as shown in Table 1:

[0059] Table 1

[0060]

[0061] Example 2

[0062] Place the assembled carbide CNC blades on the conveyor belt in the loading area, and select the spray gun pressure as 4.5bar, 5.4bar, or 6.3bar.

[0063] Only the spray gun pressure is changed, and the same type of cemented carbide CNC blade is sandblasted. The K value of the cutting edge under different spray gun pressures is as shown in Table 2:

[0064] Table 2

[0065]

[0066] Example 3

[0067] Place the installed carbide CNC blades on the conveyor belt in the loading area, and select the spray gun height as 40mm, 60mm, or 80mm.

[0068] Only the spray gun height is changed, and the same type of cemented carbide CNC blade is sandblasted. The K value of the cutting edge at different spray gun angles is as shown in Table 3:

[0069] Table 3

[0070]

[0071]

[0072] Example 4

[0073] Place the installed carbide CNC blades on the conveyor belt in the loading area, change the sand blasting grit size, and choose 150 mesh and 220 mesh.

[0074] Only changing the height of the spray gun, the same type of cemented carbide CNC blades are sandblasted, and the K values ​​of the cutting edge under different grit sizes are as shown in Table 4:

[0075] Table 4

[0076]

[0077] Comparative Example 1

[0078] The CNC blades were passivated using a manual sandblasting machine, and the cutting edge K value results are shown in Table 5:

[0079] Table 5

[0080]

[0081] Among them, the K value is the ratio of Sy to Sa. If the K value of the cutting edge is small, the cutting edge is sharp, and micro-cutting can be performed to make the workpiece have better surface finish and reduce surface roughness. If the K value of the cutting edge is large, the cutting edge is relatively blunt, and it is easy to produce greater extrusion and friction on the workpiece surface during cutting, the surface roughness increases, and defects are easy to occur. If the K value of the cutting edge is uneven, the surface roughness of the processed workpiece will be inconsistent. The part with a small K value will cut smoothly, and the place with a large K value is prone to surface tearing and scratches, leaving uneven tool marks. It can be seen from the above embodiments and comparative examples that the manual sandblasting machine in the comparative example cannot adjust the angle, height and pressure of the spray gun, and sandblasting is performed by manually holding the spray gun, and the angle and height of the above spray gun are difficult to control consistently, and the pressure is unstable, resulting in poor uniformity and large fluctuations in the K value; while the present device can effectively adjust the angle, height and pressure of the spray gun, and can filter out foreign matter in the alumina sand, and remove the waste alloy iron filings generated in the sandblasting process by magnetic attraction, and the problem that foreign matter and waste iron filings easily cause the blade edge to be damaged by spraying is effectively improved, and the blade edge processed by the sandblasting device of the present invention has good uniformity and small fluctuations in the K value.

[0082] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A CNC blade dry sandblasting passivation device, characterized in that: The device comprises a shell, the middle part of which is a sandblasting work area, and the two sides of the sandblasting work area are respectively provided with a feeding area and a discharging area, a conveying mechanism is provided in the shell to convey the blades to be sandblasted, and the conveying mechanism runs through the inside of the shell and extends from the feeding area to the discharging area; a filter screen is provided below the conveying mechanism, and a collecting bin is provided below the filter screen; A crossbeam is provided in the sandblasting work area, a sandblasting device is connected to the lower end of the crossbeam, the sandblasting device comprises a bracket, a compression spring and a spray gun, the bracket comprises an upper bracket and a lower bracket, the compression spring connects the upper bracket and the lower bracket, an adjusting bolt is provided in the compression spring, a first connecting plate is hingedly connected to the outer edge of the upper bracket, a second connecting plate is hingedly connected to the outer edge of the lower bracket, the first connecting plate and the second connecting plate are hingedly connected, the spray gun is fixedly arranged on the second connecting plate, the spray gun is connected to a sand pipe and an air pipe, and the air pipe is connected to an external compressed air system; A sand feeding device and a vibrating screen are also provided outside the shell, the sand feeding device includes a conveyor, a sand feeding port is provided at the bottom of the conveyor, a sand feeding pipe is provided at the top of the conveyor and is connected to the vibrating screen, a screen is provided inside the vibrating screen, a material pipe is provided at the bottom of the vibrating screen, the material pipe is connected to the sand pipe of the spray gun, a dust collector is connected to the top of the vibrating screen, a first dust collecting pipe connected to the sand blasting working area is provided on the dust collector, the dust collector is also connected to a negative pressure exhaust system pipe, and the negative pressure exhaust system pipe is connected to a waste sand collection bin.

2. The CNC blade dry sandblasting passivation device according to claim 1 is characterized in that: A purge work area is also provided between the sandblasting work area and the discharging area. An air gun is provided in the purge work area. The purge work area is provided with a second dust collecting pipe connected to a negative pressure exhaust system pipe. The negative pressure exhaust system pipe is connected to a waste sand collection bin through a waste sand recovery pipe.

3. The CNC blade dry sandblasting passivation device according to claim 1, characterized in that: The conveying mechanism is a conveyor belt.

4. The CNC blade dry sandblasting passivation device according to claim 3 is characterized in that: Guardrails are arranged on both sides of the conveying mechanism in the discharging area, brackets are arranged on the guardrails, a cylinder is arranged under the filter screen, the cylinder passes through the filter screen, and a top plate is arranged on the cylinder.

5. The CNC blade dry sandblasting passivation device according to claim 1, characterized in that: Demagnetization devices are arranged in the feeding area and the discharging area. The demagnetization devices are U-shaped demagnetizers with a radiator on the top.

6. The CNC blade dry sandblasting passivation device according to claim 3, characterized in that: The vibrating screen is provided with a sand screening mesh, and the vibrating screen is also provided with a magnet.

7. The CNC blade dry sandblasting passivation device according to claim 1, characterized in that: A control panel is connected to the shell, and a control module is arranged in the shell. The control module is electrically connected to the transmission mechanism, the conveyor, the vibrating screen, the dust collector, the adjusting bolts, the control panel, the external compressed air system, and the negative pressure exhaust system pipe.

8. A method for dry sandblasting passivation of a CNC blade, using the dry sandblasting passivation device for a CNC blade according to any one of claims 1 to 7 to perform dry sandblasting passivation on the blade, characterized in that: The steps include: S1. Place the blade to be sandblasted on a tray, and place the tray on a conveyor mechanism in the feed area; S2, turning on the conveying mechanism, the sand feeding device, the vibrating screen and the sand blasting device, and the sand blasting device blasts the blade to be sandblasted; S3, the material tray moves to the discharging area for unloading.

9. The dry sandblasting passivation method for CNC blades according to claim 8, characterized in that: In step S2, the angle and height of the spray gun are adjusted by compressing the adjusting bolt in the spring, and the pressure of the spray gun is adjusted by controlling the compressed air in the air pipe, wherein the angle of the spray gun is based on the horizontal plane, and the height of the spray gun is based on the distance from the spray gun to the surface of the blade to be sandblasted.

10. The dry sandblasting passivation method for CNC blades according to claim 9, characterized in that: Control the spray gun angle at 70°~90°, the spray gun pressure at 4.5bar~6.3bar, and the spray gun height at 40mm-80mm.

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