Processing technology of combined type embedded circular saw blade

Abstract

The invention discloses a machining process of a combined type inlaid circular saw blade, and relates to the technical field of circular saw blade production processes. Compared with salt bath quenching-tempering, air furnace heating quenching-tempering has the advantages that firstly, electric energy consumption is greatly saved, salt bath adopts three 75kW heating furnaces to complete quenching operation, and the air furnace can meet the quenching requirement only by adopting one 20-30kW heating furnace; meanwhile, the air furnace is used for heating, so that environmental pollution caused by high-temperature salt mist is avoided, and good energy-saving and environment-friendly properties are achieved. The first blade is divided into sawteeth and a connecting plate, the sawteeth are made of high-speed steel, the connecting plate is made of carbon steel, and compared with an original blade-embedded type circular saw blade, the cutting capacity of the combined type blade-embedded type circular saw blade is slightly improved, more importantly, the using amount of the high-speed steel is saved, and the production cost is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of circular saw blade production technology, and in particular to a processing technology of a combined circular saw blade. Background Art

[0002] In the traditional saw blade production process, the raw material of the blade block is M2 flat steel. During the processing of the blade block, it needs to be partially quenched and tempered in a salt bath furnace. The operating accuracy of local quenching is poor. If the jaw groove part of the blade block is also quenched in the salt bath furnace, the jaw groove part will be hardened, and the possibility of cracking will increase during mechanical processing of the jaw groove, and the scrap rate will increase; and the salt bath furnace takes a long time to heat up to the specified temperature. For this reason, the salt bath furnace is always in a heating state after working, which makes the salt bath furnace idle when quenching is not needed, wasting a lot of electricity and heat energy; at the same time, when the salt bath furnace is quenching, a large amount of salt mist will be generated, polluting the air. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a processing technology for a combined inlay circular saw blade, which ensures the reduction of production costs, avoids the cracking of the blade block, and eliminates air pollution.

[0004] To achieve this technical purpose, the present invention adopts the following scheme: The processing technology of the combined inlay circular saw blade comprises the following steps: Production substrate; Production of the first blade: The first blade includes saw teeth and a connecting plate, Processing of saw teeth: the outer contour of the saw teeth is cut with high-speed steel plate as the raw material, and the end bevel is roughly ground on the outer contour of the cut saw teeth, and then the lower shoulder is processed and the rivet hole is drilled. Then the saw teeth are quenched as a whole by high-frequency heating or air furnace heating, and the saw teeth are tempered in an air furnace. After tempering, the arc surface is roughly ground, and finally the combination hole is chamfered by grinding with a grinding wheel to obtain the saw teeth; Production of connecting plate: Use carbon steel plate to cut out the outer contour of the connecting plate, process the rivet holes, and chamfer the outer side of the rivet holes of the connecting plate; Connect the saw teeth and the connecting plate with rivets to obtain a first blade; Production of the second blade: Using high-speed steel plate as raw material to cut the outer contour of the second blade, roughly grinding the end bevel of the cut material, drilling rivet holes and chamfering, then quenching the saw teeth as a whole by high-frequency heating or air furnace heating, and tempering the saw teeth by air furnace, and finally sandblasting, wire cutting to cut the jaw groove and chamfering to obtain the second blade; Assemble the circular saw blade: grind the bevel of each first blade flat and the angle accurately, assemble them on the outer edge shoulder of the base, leave a gap between every two first blades to install a second blade, and then tighten the rivets one by one; grind the bevel of the second blade to a qualified level, fill them into the reserved gap one by one, so that the first blade and the second blade are staggered and kept tight to form a combined inlaid circular saw blade.

[0005] Compared with the prior art, the present invention has the following beneficial effects: (1) The first blade is divided into a saw tooth and a connecting plate. The saw tooth part is made of high-speed steel, and the connecting plate part is made of carbon steel. Compared with the original inlaid circular saw blade, the cutting ability of the combined inlaid circular saw blade obtained by the present invention is slightly improved compared with the original circular saw blade. More importantly, the amount of high-speed steel is saved, which greatly reduces the production cost.

[0006] (2) Compared with salt bath quenching and tempering, air furnace heating quenching and tempering can greatly save electricity consumption. The salt bath uses three 75kW heating furnaces to complete the quenching operation, while the air furnace only needs one 20~30kW heating furnace to meet the quenching requirements. At the same time, air furnace heating eliminates the pollution of high temperature salt mist to the environment, which is energy-saving and environmentally friendly.

[0007] (3) The lower part of the traditional blade block is provided with a deep and narrow jaw groove, which is easy to crack or deform during the local heat treatment process, increasing the scrap rate; the first blade is composed of a combination of high-speed steel saw teeth and a carbon steel connecting plate. The carbon steel has good flexibility. The connecting plate in the first blade is directly embedded in the matrix, avoiding the risk of cracking when the blade is embedded in the matrix, and improving the qualified rate of finished products.

[0008] Furthermore, it also includes the tooth profile sharpening of the teeth of the combined inlay circular saw blade: Grinding the tooth shape of circular saw blade teeth; Use a grinding machine and two opposite grinding wheel sections to grind the two sides of the sawtooth part to obtain the radial clearance angle of the sawtooth, and grind the rivet flat, leaving a processing allowance of 0.1~0.2mm on the blade width; Use a grinder to grind the nozzle grooves on both sides of the blade; Use the end face of the CBN grinding wheel of the CNC grinding machine to grind the tangential side clearance angle of the saw teeth; Use CNC tooth top and tooth surface grinders to grind the front angle, back angle, tooth height difference and 45° chamfer of saw teeth; Final leveling: The saw blade after sharpening needs to be leveled to adjust the flatness, end jump and stress indicators. Once all are qualified, the combined inlaid circular saw blade product is obtained.

[0009] Further, the processing of the substrate: use carbon steel plates to cut and cut materials, quench and temper the cut substrate materials, perform rough leveling after tempering, perform rough grinding after rough leveling, then perform secondary tempering, and then perform semi-fine leveling, then turn the inner and outer circles and bosses on the substrate, drill rivet holes, and finally perform fine grinding and fine leveling to obtain a qualified substrate.

[0010] Furthermore, the tangential side clearance angle ranges from 0.5° to 1°. Due to the improvement in the processing of the tangential clearance angle, the service life of the combined saw blade obtained by the present invention is increased by 10-15% compared to the service life of a circular saw blade with a uniform blade.

[0011] Furthermore, the air furnace power is 20~30kW. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of the blade splicing structure of the combined inlay circular saw blade provided by the present invention; Figure 2 for Figure 1 Schematic diagram of the middle AA surface; Figure 3 for Figure 1 Schematic diagram of the middle BB surface; Figure 4 for Figure 1 Schematic diagram of the middle C direction; Figure 5 A schematic diagram of the structure of a sawtooth blade provided in an embodiment of the present invention; Figure 6 for Figure 5 Schematic diagram of the middle DD surface; Figure 7 A schematic diagram of the front view structure of a first blade provided in an embodiment of the present invention; Figure 8 A schematic side view of the structure of a first blade provided in an embodiment of the present invention; Fig. 9 A schematic diagram of the structure of a connecting plate provided in an embodiment of the present invention; The markings in the figure are: 1, base; 11, second boss; 2, second blade; 21, jaw groove; 3, first blade; 31, connecting plate; 32, serration; 321, first boss; 322, rivet hole; 323, semicircular coupling hole. DETAILED DESCRIPTION

[0013] In order to fully understand the purpose, features and effects of the present invention, the present invention is described in detail through the following specific implementation methods, but the present invention is not limited thereto.

[0014] like Figures 1 to 3As shown, a combined inlaid circular saw blade includes a base 1 and a blade, and the blade is fastened to the base 1 by rivets. The blade is divided into a second blade 2 and a first blade 3. The second blade 2 has only one rivet hole 322, and the first blade 3 has two or more rivet holes 322. The second blade 2 and the first blade 3 are alternately arranged on the base 1, and the combined rivet holes 322 are equidistantly distributed along the circumferential direction. Preferably, the blade tangential clearance angle α of the saw blade is in the range of 0.5°~1°, such as Figure 4 shown.

[0015] The present invention provides a processing technology for a combined circular saw blade, comprising the following steps: Production of substrate (same as prior art): cutting of low alloy tool steel plates, quenching and tempering of the cut substrate material, rough leveling after tempering, rough grinding after rough leveling, secondary tempering, semi-fine leveling, then turning the inner and outer circles and the second boss 11 on the substrate, drilling rivet holes, and finally fine grinding and fine leveling to obtain a qualified substrate 1.

[0016] Production of the first blade: The first blade 3 includes a sawtooth 32 made of high-speed steel and a connecting plate 31 made of carbon steel. The lower side of the sawtooth 32 is provided with a first boss 321. A plurality of second bosses 11 are evenly distributed on the outer circular contour of the substrate 1 in the circumferential direction, and the spacing of the second shoulders 11 matches that of the sawtooth. The first boss 321 and the second boss 11 are arranged relatively to each other up and down, and a connecting plate 31 is pressed on both sides of the first boss 321 and the second boss 11 respectively. Rivet holes 322 are provided on the connecting plate 31 aligned with the positions of the first boss 321 and the second boss 11. The first boss 321, the second boss 11 and the connecting plate 31 are connected as a whole by rivets, that is, the first blade 3 is connected to the substrate 1. Preferably, the thickness of the connecting plate 31 is the same as the thickness of the groove of the first boss 321 or the second boss 11, so that the connecting plate 31 is coplanar with the sawtooth 32 and the outer surface of the substrate 1, thereby achieving a planar connection effect. The outer side of the rivet hole on the connecting plate 31 is a chamfered cone hole structure, such as Fig. 9 As shown in the figure, the tapered hole traps the rivet head so that the head is coplanar with the saw blade. Figures 5 to 8 As shown, the second blade 2 and the first blade 3 are provided with semicircular coupling holes 323 on both side walls, and the semicircular coupling holes of the second blade and the adjacent semicircular coupling holes on the same side of the first blade form a complete coupling hole, and rivets are installed in the coupling holes to splice the second blade 2 and the first blade 3 together. The lower end surface of the second blade 2 is provided with a jaw groove 21 of the second shoulder 11, the jaw groove 21 opens downward, and a rivet hole is provided on the jaw groove 21, and the second blade 2 is connected to the second shoulder 11 of the base 1 by rivets.

[0017] Processing of saw teeth: Use high-speed steel plate as raw material to cut the outer contour of saw teeth 32, roughly grind the two end bevels of the cut material, process the lower first shoulder 321 of the cut material, drill the rivet hole 322 and chamfer, and then quench (the original process is salt bath quenching, local quenching) through high-frequency heating or air furnace heating for overall quenching, and air furnace heating quenching is mostly used. Compared with salt bath quenching, air furnace heating quenching greatly saves electricity consumption. The salt bath uses three 75kW heating furnaces to complete the quenching operation, while the air furnace only needs one 20~30kW heating furnace to meet the quenching requirements; at the same time, air furnace heating eliminates the pollution of high-temperature salt mist to the environment.

[0018] Tempering: the traditional process uses a salt bath furnace for tempering, and the heating furnace power is 75kW. The tempering furnace in this application uses an air furnace with a power of 20~30kW, which also reduces the pollution of salt mist to the environment.

[0019] Then the arc surface is roughly ground, and finally the combination hole is chamfered by grinding wheel to obtain the saw teeth 32.

[0020] Production of connecting plate parts: The outer contour and rivet holes of the connecting plate 31 are cut out by using a carbon steel plate using a laser, and the outer side surfaces of the rivet holes of the connecting plate 31 are chamfered.

[0021] The processed serrations 32 and the connecting plate 31 are connected by rivets to obtain the first blade 3 .

[0022] The lower part of the traditional equidistant blade block is provided with a deep and narrow jaw groove, which is easy to crack or deform during the local heat treatment process, and the scrap rate increases; the first blade 3 in the present invention is composed of a combination of high-speed steel saw teeth and a carbon steel connecting plate. The carbon steel has good flexibility. The connecting plate in the first blade is directly embedded in the matrix, avoiding the risk of cracking when the blade is embedded in the matrix, and improving the qualified rate of finished products.

[0023] Production of the second blade: The outer contour of the second blade 2 is cut using high-speed steel plate as raw material, two end bevels are roughly ground on the cut material, rivet holes are drilled, chamfers are performed, and then quenching and tempering are performed (the process is the same as the sawtooth quenching and tempering process of the first blade), and finally sandblasting is performed, and the jaw groove is cut by wire cutting and chamfered to obtain the second blade.

[0024] The jaw groove 21 is processed after heat treatment, and a wire cutting process is used instead of mechanical processing to avoid cracking and deformation of the jaw groove during processing.

[0025] Assembling the circular saw blade: Grind the two bevels of each first blade 3 flat, grind the angle accurately, and make the length appropriate. Assemble them on the outer edge shoulder of the base body, leaving a gap between every two first blades 3 to install a second blade 2, and then tighten the rivets one by one; Next, the second blade 2 is ground to a qualified bevel and filled into the aforementioned reserved gap one by one, so that the first blade 3 and the second blade 2 are staggered and kept fastened to form a combined inlaid circular saw blade.

[0026] Processing saw blade tooth grinding: (1) Grinding the tooth shape of circular saw blade teeth; (2) Use a grinding machine and two opposite grinding wheel sections to grind the two sides of the sawtooth part to obtain the radial clearance angle of the sawtooth, and grind the rivet flat, leaving a machining allowance of 0.1~0.2mm on the blade width; (3) Use a grinder to grind the nozzle grooves on both sides of the blades (the first blade and the second blade); (4) Use the end face of the CBN grinding wheel of the CNC grinding machine to grind the tangential side clearance angle of the saw teeth; (5) Use CNC tooth top and tooth surface grinders to grind the front angle, back angle, tooth height difference, and 45° chamfer of saw teeth; (6) Final leveling: The saw blade after sharpening needs to be leveled to adjust the flatness, end jump and stress indicators. Once all are qualified, the combined inlaid circular saw blade product is obtained.

[0027] The combined inlaid circular saw blade reduces the sawing load by increasing the tangential side clearance angle of the saw teeth, and the cutting capacity of the saw blade is increased by about 10% compared with the traditional one.

[0028] The production of a φ1320mm saw blade saves 0.3kg of M2 high-speed steel for each blade block. Each saw blade consists of 36 blade blocks. Compared with a φ1320mm circular saw blade with equidistant inserts, a total of 10.8kg of M2 high-speed steel is saved. The price of M2 high-speed steel is 60 yuan per kilogram, with a total savings of 648 yuan. After deducting the additional carbon steel consumption of 100 yuan, the total savings are 548 yuan per circular saw blade.

[0029] Finally, it should be noted that the above-listed embodiments are only preferred embodiments of the present invention. Of course, those skilled in the art can make changes and modifications to the present invention. If these modifications and variations fall within the scope of the claims of the present invention and their equivalent technologies, they should be considered to be within the scope of protection of the present invention.

Claims

1. A processing technology for a combined inlay circular saw blade, characterized in that: The steps include: Production substrate; Production of the first blade: The first blade includes saw teeth and a connecting plate, Processing of saw teeth: the outer contour of the saw teeth is cut with high-speed steel plate as the raw material, and the end bevel is roughly ground on the outer contour of the cut saw teeth, and then the lower shoulder is processed and the rivet hole is drilled. Then the saw teeth are quenched as a whole by high-frequency heating or air furnace heating, and the saw teeth are tempered in an air furnace. After tempering, the arc surface is roughly ground, and finally the combination hole is chamfered by grinding with a grinding wheel to obtain the saw teeth; Production of connecting plate: Use carbon steel plate to cut out the outer contour of the connecting plate, process the rivet holes, and chamfer the outer side of the rivet holes of the connecting plate; Connect the saw teeth and the connecting plate with rivets to obtain a first blade; Production of the second blade: Using high-speed steel plate as raw material to cut the outer contour of the second blade, roughly grinding the end bevel of the cut material, drilling rivet holes and chamfering, then quenching the saw teeth as a whole by high-frequency heating or air furnace heating, and tempering the saw teeth by air furnace, and finally sandblasting, wire cutting to cut the jaw groove and chamfering to obtain the second blade; Assembling circular saw blades: grind the bevel of each first blade flat, and grind the angle and length accurately, and assemble them on the outer edge boss of the base, leaving a gap between every two first blades to install a second blade, and then tighten the rivets one by one; then grind the end bevel of each second blade to meet the requirements, and fill them into the reserved gaps one by one, so that the first blades and the second blades are staggered and cover the entire circumference of the base, and keep all the blades tight to form a combined inlaid circular saw blade.

2. The processing technology of the combined insert circular saw blade according to claim 1, characterized in that: It also includes the tooth profile sharpening of the saw teeth of the combined insert circular saw blade: Grinding the tooth shape of circular saw blade teeth; Use a grinding machine and two opposite grinding wheel end faces to grind the two sides of the sawtooth part to obtain the radial clearance angle of the sawtooth, and grind the rivet flat, leaving a processing allowance of 0.1~0.2mm on the blade width; Use a grinder to grind the nozzle grooves on both sides of the blade; Use the end face of the CBN grinding wheel of the CNC grinding machine to grind the tangential side clearance angle of the saw teeth; Use CNC tooth top and tooth surface grinders to grind the front angle, back angle, tooth height difference and 45° chamfer of saw teeth; Final leveling: The saw blade after sharpening needs to be leveled to adjust the flatness, end jump and stress indicators. Once all are qualified, the combined inlaid circular saw blade product is obtained.

3. The processing technology of the combined insert circular saw blade according to claim 1, characterized in that: Processing of the substrate: Use carbon steel plates to cut and cut the materials, quench and temper the cut substrate materials, perform rough leveling after tempering, perform rough grinding after rough leveling, then perform secondary tempering, and then perform semi-fine leveling. Then turn the inner and outer circles and shoulders on the substrate, drill rivet holes, and finally perform fine grinding and fine leveling to obtain a qualified substrate.

4. The processing technology of the combined insert circular saw blade according to claim 2, characterized in that: The tangential backlash angle ranges from 0.5° to 1°.

5. The processing technology of the combined insert circular saw blade according to claim 1, characterized in that: The air furnace power is 20~30kW.

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