Isothermal normalizing process for gear forgings

Abstract

The present invention relates to the field of gear forgings, and in particular to an isothermal normalizing process for gear forgings, comprising a base, a furnace loading device and a fixing device, wherein the base is composed of a fixed bottom plate and four supporting legs, a furnace loading device is installed on the top of the base, and a fixing device is arranged inside the furnace loading device. The present invention provides an isothermal normalizing process for gear forgings. Before placing the gear blank into the furnace body for isothermal normalizing treatment, the distance between the I-shaped plates on which the gear blank is placed can be adjusted by a set fixing device, thereby preventing the gear blank from colliding during the isothermal normalizing treatment and avoiding affecting the quality of the gear forgings; the present invention provides a moving component, which can enable the I-shaped plate to drive multiple fixed gear blanks to rotate and heat during the isothermal normalizing treatment of the gear blank, thereby achieving a more uniform heating effect on the gear blank, thereby improving the quality of the gear blank.

Description

Technical Field

[0001] The invention relates to the field of gear forgings, and in particular to an isothermal normalizing process for gear forgings. Background Art

[0002] Isothermal normalizing is a heat treatment process that heats ordinary carbon steel to austenite. The heating temperature and holding time are the same as those of ordinary normalizing. The steel after holding is cooled and isothermally maintained to complete the transformation of supercooled austenite within this temperature range to obtain a finer pearlite structure, and then air-cooled to obtain better processing performance and mechanical properties. The use of isothermal normalizing technology has achieved effective control of the quality of components such as transmission gears and shaft parts, thereby improving machinability and heat treatment deformation stability.

[0003] The following problems exist in the process of isothermal normalizing treatment of gear forgings:

[0004] 1. When the gear forgings are subjected to isothermal normalizing treatment, the gear blanks are generally placed directly into the normalizing furnace for isothermal normalizing treatment. During the placement process, collisions are prone to occur, which affects the quality of the gear forgings.

[0005] 2. During the isothermal normalizing treatment of gear forgings, the gear blank is generally fixed. Due to the certain temperature error in the furnace body, the gear blank is easily heated unevenly, which in turn affects the quality of the gear forgings to a certain extent. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, the present invention provides an isothermal normalizing process for gear forgings.

[0007] The technical problem to be solved by the present invention is achieved by adopting the following technical solution: a gear forging isothermal normalizing process, wherein the gear forging isothermal normalizing process specifically comprises the following steps:

[0008] S1. Forging: First, the gear blank is hot-forged by a hot-forging press, and finally the gear blank is manufactured by upsetting.

[0009] S2. Gear placement: Place the gear blanks obtained in step S1 in batches on a fixing device.

[0010] S3, normalizing treatment: finally, the fixing device for fixing the gear blank in step S2 is placed into the furnace loading device, and the gear blank is normalized.

[0011] The isothermal normalizing processing technology of gear forgings adopting the above steps S1-S3 also specifically involves a gear forging isothermal normalizing processing device during the isothermal normalizing of gear forgings, including a base, a furnace loading device and a fixing device. The base is composed of a fixed bottom plate and four support legs. The furnace loading device is installed on the top of the base, and the fixing device is arranged inside the furnace loading device.

[0012] The furnace loading device includes a furnace body. The tops of the four support legs are fixedly installed with the furnace body together. The furnace body is in a hollow circular barrel structure. The side wall of the furnace body is evenly provided with sliding grooves communicating with the center of the furnace body along the circumferential direction. An annular plate is installed at the center position inside the furnace body. Symmetric driving components are symmetrically arranged at the top and bottom of the furnace body, and clamping components evenly arranged along the circumferential direction of the furnace body are symmetrically arranged at positions far from the center of the furnace body at the top and bottom of the furnace body. A moving component is also arranged at the bottom of the furnace body.

[0013] Preferably, the fixing device includes a U-shaped plate. The U-shaped plates are all slidably arranged in the sliding grooves opened along the circumferential direction of the furnace body. The opening sections of the U-shaped plates face away from the center of the furnace body and are all fixedly installed with arc-shaped plates with concave surfaces contacting the outer ring walls. One end of the arc-shaped plate far from the outer ring wall of the furnace body is fixedly installed with a handle. Limiting grooves are opened on the opposite surfaces of the two horizontal sections of the U-shaped plate, and heat dissipation holes are evenly opened on the vertical section of the U-shaped plate. A fixing plate is jointly installed between the two horizontal sections of the U-shaped plate through a rotatably connected rotating rod. A spline groove is opened at the bottom of the rotating rod located at the lower side. A rectangular through groove is opened on the fixing plate. A plurality of I-shaped plates in the shape of "I" are vertically slidably connected in the rectangular through groove. Placing grooves are evenly opened at the tops of the two vertical sections of the I-shaped plate. Limiting blocks are rotatably arranged in the placing grooves through pin shafts. Placing components for placing gear blanks are arranged on the limiting blocks. Insertion grooves communicating with the rectangular through groove and evenly arranged from top to bottom are symmetrically opened on both sides of the fixing plate. Insertion plates for supporting the I-shaped plate are slidably clamped in the insertion grooves corresponding to the I-shaped plate.

[0014] Preferably, the middle part of the annular plate is horizontally slidably penetrated by a structural plate along the circumferential direction. One end of the structural plate located outside the annular plate is fixedly installed with a pushing plate. The pushing plate and the annular plate are connected by a plurality of return springs. The upper and lower sides of the end of the structural plate located inside the annular plate are both in an arc shape.

[0015] Preferably, the clamping assembly includes a clamping plate, which slides through the furnace body, and one end of the clamping plate is located inside the furnace body and is inclined upward on a side away from the center of the furnace body, and a pressure plate is fixedly installed on the side wall of one end of the clamping plate located outside the furnace body, and the pressure plate and the furnace body are connected by a movable spring, and a rectangular through hole is opened on the pressure plate, and the vertical cross-section of the rectangular through hole is a right-angled trapezoidal structure with the small-diameter end horizontally facing away from the center of the furnace body; a movable block is provided at the top of the furnace body and near the center of the furnace body through a vertical plate evenly arranged in the circumferential direction, and the end of the vertical plate away from the furnace body is slidably connected to the movable block by a push spring, and one end of the movable block is slidably connected to the rectangular through hole corresponding to its position, and the other end of the movable block is connected to the driving assembly.

[0016] Preferably, the driving assembly includes a circular rod, the other end of the moving block contacts the annular surface of the same No. 1 frustum block, the No. 1 frustum block is mounted on one end of the circular rod, and the other end of the circular rod slides through the furnace body and is installed with the No. 2 frustum block, an L-shaped plate is installed on the circular rod, the No. 1 frustum block on the same circular rod is located between the No. 2 frustum block and the circular rod, and a fixed block with a bidirectional electric push rod is installed on the side wall of the furnace body, and the two moving ends of the bidirectional electric push rod are respectively fixedly connected to the vertical sections of their corresponding L-shaped plates.

[0017] Preferably, the moving assembly includes a telescopic rod, and the bottom of the furnace body is connected with the telescopic rod in a circumferentially uniform sliding manner. One end of the telescopic rod located in the furnace body is plugged into a spline groove corresponding to its position. A driving motor is fixedly installed on the fixed bottom plate, and the output shaft of the driving motor is fixedly connected to one of the telescopic rods. The bottom of the remaining telescopic rod is rotatably connected to the fixed bottom plate. Sprockets are fixedly installed on the telescopic rods, and the multiple sprockets are connected through chain rings.

[0018] Preferably, the placement assembly includes a hanging rod, and the limit blocks are all fixed with a hanging rod for placing the gear. A fixing groove is provided at one end of the hanging rod away from the limit block, and two fixed blocks are fixedly installed in the fixing groove by a spring rod. The opposite sides of the two hanging rods form an eight-shaped structure with the small-diameter end away from the limit block.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. The present invention provides an isothermal normalizing process for gear forgings. Before the gear blank is placed in a furnace body for isothermal normalizing treatment, the distance between the I-shaped plates on which the gear blank is placed can be adjusted by a set fixing device, thereby preventing the gear blank from colliding during the isothermal normalizing treatment and avoiding affecting the quality of the gear forging.

[0021] 2. The present invention provides a moving component, so that during the isothermal normalizing treatment of the gear blank, the I-shaped plate can drive multiple fixed gear blanks to rotate and heat, thereby achieving a more uniform heating effect on the gear blank, thereby improving the quality of the gear blank.

[0022] 3. The clamping assembly provided in the present invention can limit and fix the shaped plate to prevent the shaped plate from moving during the isothermal normalizing treatment, thereby avoiding affecting the isothermal normalizing treatment effect of the gear blank.

[0023] 4. The placement assembly provided in the present invention can limit and fix the gear blank, thereby preventing the gear blank from falling during isothermal normalizing treatment, thereby avoiding affecting the processing of the gear blank and avoiding damage to the gear blank.

[0024] 5. The drive assembly provided in the present invention can act on multiple fixing devices at the same time to achieve synchronous unloading, thereby improving the unloading efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 It is a flow chart of the present invention.

[0027] Figure 2 It is a first three-dimensional structural schematic diagram of the present invention.

[0028] Figure 3 It is a second three-dimensional structural schematic diagram of the present invention.

[0029] Figure 4 It is a three-dimensional structural schematic diagram of the fixing device of the present invention.

[0030] Figure 5 It is a main cross-sectional structural schematic diagram of the present invention.

[0031] Figure 6 The present invention Figure 5 A local enlarged view in the M direction.

[0032] Figure 7 The present invention Figure 5 AA section view.

[0033] Figure 8 The present invention Figure 7 N-axis local enlarged view.

[0034] Fig. 9 The present invention Figure 5 BB section view.

[0035] Fig.10It is a schematic diagram of the connection structure of the fixing device of the present invention.

[0036] In the figure: 1. Base; 2. Furnace loading device; 21. Furnace body; 22. Ring plate; 221. Structural plate; 222. Pushing plate; 223. Return spring; 23. Driving component; 231. Circular rod; 232. First frustum block; 233. Second frustum block; 234. L-shaped plate; 235. Fixed block; 24. Clamping component; 241. Clamping plate; 242. Pressing plate; 243. Moving spring; 244. Vertical plate; 245. Pushing spring; 246. Moving block; 25. Moving component; 251. Telescopic rod; 252. Driving motor; 253. Sprocket; 254. Chain loop; 3. Fixing device; 31. C-shaped plate; 32. Arc plate; 33. Rotating rod; 34. Fixed plate; 35. I-shaped plate; 36. Limiting block; 37. Placing component; 371. Hanging rod; 372. Spring rod; 373. Fixed stop block; 38. Plug-in plate. Detailed implementation manners

[0037] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention is further described.

[0038] An isothermal normalizing processing technology for gear forgings, the isothermal normalizing processing of the gear forgings specifically includes the following steps:

[0039] S1. Forging blank making: First, the blank for making the gear is subjected to hot die forging by a hot die forging press, and finally the gear blank is manufactured by the method of upsetting blank making.

[0040] S2. Gear placement: The gear blanks obtained in step S1 are placed on the fixing device 3 in batches.

[0041] S3. Normalizing treatment: Finally, the fixing device 3 for fixing the gear blanks in step S2 is placed into the furnace loading device 2, and the gear blanks are subjected to normalizing treatment.

[0042] Refer to Figure 2 , when the isothermal normalizing processing technology for gear forgings using the above steps S1 - S3 is performing isothermal normalizing on gear forgings, it also specifically involves an isothermal normalizing processing equipment for gear forgings, including a base 1, a furnace loading device 2 and a fixing device 3. The base 1 is composed of a fixed bottom plate and four support legs. The furnace loading device 2 is installed on the top of the base 1, and the fixing device 3 is arranged inside the furnace loading device 2.

[0043] Refer to Figure 2 , Figure 3 and Figure 5, the charging device 2 includes a furnace body 21, an annular plate 22, a driving assembly 23, a clamping assembly 24 and a moving assembly 25. The tops of the four support legs are fixedly installed with the furnace body 21 together. The furnace body 21 is in a hollow circular barrel structure. The side wall of the furnace body 21 is evenly provided with sliding grooves communicating with the center of the furnace body 21 along the circumference. An annular plate 22 is installed at the central position inside the furnace body 21. Driving assemblies 23 are symmetrically arranged at the top and bottom of the furnace body 21, and clamping assemblies 24 evenly arranged along the circumference of the furnace body 21 are symmetrically arranged at positions away from the center of the furnace body 21 at the top and bottom of the furnace body 21. A moving assembly 25 is also arranged at the bottom of the furnace body 21.

[0044] In the original state, first place the gear blank to be subjected to isothermal normalizing treatment on the fixing device 3 for limiting. After the limiting is completed, place the fixing device 3 and the gear blank as a whole into the furnace body 21 for clamping, and then the isothermal normalizing treatment can be carried out on the gear blank. By means of the arranged moving assembly 25, the rotating rod 33 can drive the fixing plate 34 to rotate, so that the fixing plate 34 drives the gear blank limited and fixed on the I-shaped plate 35 to rotate, making the gear blank heat more evenly during the isothermal normalizing treatment, thereby improving the quality of the gear blank. After the gear blank completes the isothermal normalizing treatment, by means of the arranged driving assembly 23, multiple U-shaped plates 31 can be simultaneously unloaded, which can improve the unloading efficiency of the equipment.

[0045] Refer to Figure 3 , Figure 4 Figure 5 and Fig.10 , the fixing device 3 includes a U-shaped plate 31, an arc-shaped plate 32, a rotating rod 33, a fixing plate 34, an I-shaped plate 35, a limiting block 36, a placing assembly 37 and a plugging plate 38. The U-shaped plates 31 are all slidably arranged in the sliding grooves opened along the circumference of the furnace body 21. The opening sections of the U-shaped plates 31 face away from the center of the furnace body 21 and are all fixedly installed with arc-shaped plates 32 with concave surfaces in contact with the outer ring wall of the furnace body 21. One end of the arc-shaped plate 32 away from the outer ring wall of the furnace body 21 is fixedly installed with a handle. Limiting grooves are opened on the opposite surfaces of the two horizontal sections of the U-shaped plate 31. Heat dissipation holes are evenly opened on the vertical section of the U-shaped plate 31. A fixing plate 34 is jointly installed between the two horizontal sections of the U-shaped plate 31 through a rotatably connected rotating rod 33. A spline groove is opened at the bottom of the rotating rod 33 located at the lower side. A rectangular through groove is opened on the fixing plate 34. A plurality of I-shaped I-shaped plates 35 are vertically slidably connected in the rectangular through groove. Placing grooves are evenly opened at the tops of the two vertical sections of the I-shaped plate 35. Limiting blocks 36 are rotatably arranged in the placing grooves through pin shafts. Placing assemblies 37 for placing gear blanks are arranged on the limiting blocks 36. Plugging grooves uniformly arranged from top to bottom and communicating with the rectangular through groove are symmetrically opened on both sides of the fixing plate 34. Plugging plates 38 for supporting the I-shaped plate 35 are slidably clamped in the plugging grooves corresponding to the I-shaped plate 35.

[0046] First, the gear blank is hot forged by a hot forging press, and then the gear blank is manufactured by the upsetting method. Then, the distance between the I-shaped plates 35 and the I-shaped plates 35 on the fixed plate 34 is adjusted to prevent the gear blanks from colliding during the isothermal normalizing treatment due to the distance being too close, thereby affecting the forging quality of the gear blank. After the distance between the I-shaped plates 35 and the I-shaped plates 35 is adjusted, the provided plug-in plate 38 is plugged into the plug-in groove on the side wall of the fixed plate 34 to support the I-shaped plate 35. After the distance is adjusted, the obtained gear blank is placed on the corresponding placement component 37, and is limited and fixed by the placement component 37 to prevent it from falling during the isothermal normalizing treatment of the gear blank, thereby causing a certain impact on the gear blank.

[0047] See also Figure 7 and Figure 8 The placement assembly 37 includes a hanging rod 371, a spring rod 372 and a fixed stopper 373. The limit blocks 36 are all fixed with hanging rods 371 for placing gears. The end of the hanging rod 371 away from the limit block 36 is provided with a fixing groove, and two fixed stops 373 are fixedly installed in the fixing groove through the spring rod 372. The opposite sides of the two hanging rods 371 form an eight-shaped structure with the small-diameter end away from the limit block 36.

[0048] After the I-shaped plate 35 is supported, the gear blank to be subjected to isothermal normalizing treatment is placed on the suspension rod 371. The eight-shaped structure formed by the opposite sides of the two 373 in the same fixing groove can facilitate the movement of the gear blank on the suspension rod 371. When the gear blank contacts the fixed stop 373, the gear blank pushes the fixed stop 373 to move it into the fixing groove, and simultaneously squeezes the spring rod 372. After the gear blank is pushed to contact one end of the limit block 36, the gear blank crosses the fixed stop 373. At this time, under the action of the spring rod 372, the fixed stop 373 returns to its original position and clings to the surface of the gear blank to limit and fix the gear blank, which facilitates the rapid loading and unloading of the gear. The provided limit block 36 can rotate in the placement groove. In order to avoid collisions between gear blanks, the unused suspension rod 371 can be moved into the placement groove by rotating the limit block 36 upward. After the gear blank is limited and fixed, the C-shaped plate 31 is inserted into the sliding groove on the furnace body 21 at this time. The C-shaped plate 31 makes the I-shaped plate 35 on the fixing plate 34 drive the limited and fixed gear blank into the furnace body 21. When the concave surface of the arc-shaped plate 32 abuts against the outer wall of the furnace body 21, the C-shaped plate 31 is clamped and fixed by the provided clamping assembly 24 to prevent the C-shaped plate 31 from moving during the isothermal normalizing treatment and avoid affecting the isothermal normalizing treatment of the gear blank. After the C-shaped plate 31 is completely inserted into the furnace body 21, the isothermal normalizing treatment of the gear blank can be carried out.

[0049] Refer to Figure 5 and Figure 6 As shown in FIGS. 7 and 8, the clamping assembly 24 includes a clamping plate 241, a pressing plate 242, a moving spring 243, a vertical plate 244, a pushing spring 245 and a moving block 246. The clamping plate 241 slides through the furnace body 21. One end of the clamping plate 241 located inside the furnace body 21 is inclined upward on the side away from the center of the furnace body 21. A pressing plate 242 is fixedly installed on the side wall of the end of the clamping plate 241 located outside the furnace body 21. The pressing plate 242 and the furnace body 21 are connected by a moving spring 243. A rectangular through hole is formed in the pressing plate 242. The vertical cross-section of the rectangular through hole is a right trapezoidal structure with the small-diameter end horizontally facing away from the center of the furnace body 21. A moving block 246 is arranged on the top of the furnace body 21 and near the center of the furnace body 21 through circumferentially and uniformly arranged vertical plates 244. One end of the vertical plate 244 away from the furnace body 21 is slidably connected in the moving block 246 through a pushing spring 245. One end of the moving block 246 is slidably connected to the corresponding rectangular through hole, and the other end of the moving block 246 is connected to the driving assembly 23;

[0050] In the original state, under the action of the moving spring 243, the pressing plate 242 positions the clamping plate 241 inside the furnace body 21. During the insertion of the C-shaped plate 31, the horizontal section of the C-shaped plate 31 first contacts the inclined surface of the clamping plate 241, thereby pushing the clamping plate 241 upward to facilitate the entry of the C-shaped plate 31. When the limiting groove is directly opposite to the clamping plate 241, under the reaction force of the moving spring 243, the end of the clamping plate 241 where the inclined surface is located is inserted into the limiting groove on the C-shaped plate 31, thereby limiting and fixing the C-shaped plate 31 to prevent the C-shaped plate 31 from moving during the isothermal normalizing process.

[0051] Refer to Figure 5 and Fig. 9 As shown in FIGS. and

[0051] , the moving assembly 25 includes a telescopic rod 251, a driving motor 252, a sprocket 253, and a chain loop 254. The bottom of the furnace body 21 is uniformly and slidably penetrated along the circumferential direction by the telescopic rod 251. One end of the telescopic rod 251 located inside the furnace body 21 is inserted into the spline groove corresponding to its position. A driving motor 252 is fixedly installed on the fixed bottom plate. The output shaft of the driving motor 252 is fixedly connected to one of the telescopic rods 251, and the bottom of the remaining telescopic rods 251 is rotatably connected to the fixed bottom plate. Sprockets 253 are fixedly installed on the telescopic rods 251, and the multiple sprockets 253 are driven and connected by the chain loop 254.

[0052] After the C-shaped plate 31 is completely inserted into the furnace body 21, manually move the telescopic rod 251 to insert the telescopic rod 251 into the spline groove opened on the lower rotating rod 33. At this time, start the driving motor 252. The driving motor 252 drives one of the telescopic rods 251 to rotate. At this time, under the action of the chain loop 254, the multiple sprockets 253 drive the telescopic rods 251 to rotate. The telescopic rods 251 cause the fixing plate 34 to drive the I-shaped plate 35 to rotate, thereby driving the limited and fixed gear blank to rotate, so that the gear blank can be heated more evenly during the isothermal normalizing process, thereby improving the quality of the gear blank.

[0053] Refer to Figure 3 and Figure 5, the driving component 23 includes a circular rod 231, a first frustum block 232, a second frustum block 233, an L-shaped plate 234 and a fixed block 235. The other end of the moving block 246 is in contact with the annular surface of the same first frustum block 232. The first frustum block 232 is sleeved on one end of the circular rod 231. The other end of the circular rod 231 slides through the furnace body 21 and is installed with a second frustum block 233. An L-shaped plate 234 is installed on the circular rod 231. The first frustum block 232 on the same circular rod 231 is located between the second frustum block 233 and the circular rod 231. A fixed block 235 with a bidirectional electric push rod is installed on the side wall of the furnace body 21. The two moving ends of the bidirectional electric push rod are respectively fixedly connected to the vertical sections of the corresponding L-shaped plates 234;

[0054] Refer to Figure 5 and Figure 7 , the middle part of the annular plate 22 horizontally slides through the structural plate 221 along the circumferential direction uniformly. Push plates 222 are fixedly installed at the ends of the structural plate 221 located outside the annular plate 22. A plurality of return springs 223 are connected between the push plates 222 and the annular plate 22. The upper and lower sides of the end of the structural plate 221 located inside the annular plate 22 are both arc-shaped structures.

[0055] After the isothermal normalizing treatment of the gear blank, the telescopic rod 251 is separated from the spline groove manually, and then the bidirectional electric push rod is started. The bidirectional electric push rod makes the L-shaped plate 234 drive the upper and lower circular rods 231 to move relatively, so that the first frustum block 232 on the circular rod 231 first contacts the moving block 246. During the downward movement of the first frustum block 232, the moving block 246 is pushed to move horizontally along the rectangular through hole. Under the cooperation of the inclined surfaces of the moving block 246 and the rectangular through hole, the clamping plate 241 drives the moving block 242 to move away from the C-shaped plate 31, so that the clamping plate 241 first disengages from the limiting groove on the C-shaped plate 31. At this time, the circular rod 231 continues to move downward, so that the circular rod 231 drives the second frustum block 233 to squeeze the structural plate 221. The structural plate 221 drives the push plate 222 to move horizontally synchronously to push the C-shaped plate 31 out of the furnace body 21, realizing the synchronous blanking of all C-shaped plates 31, thereby improving the blanking efficiency of the equipment.

[0056] Specifically in operation:

[0057] In the first step, in the original state, first, the blank for making the gear is hot die forged by a hot die forging press, and finally the gear blank is manufactured by the method of upsetting and blanking.

[0058] Step 2: Adjust the distance between the I-shaped plates 35 on the fixing plate 34. After adjusting the distance between the I-shaped plates 35, insert the inserted plate 38 into the insertion slot on the side wall of the fixing plate 34 at this time, so as to play a role in承接 the I-shaped plate 35. After adjusting the distance, place the gear blank to be isothermal normalized on the suspension rod 371 at this time. When the gear blank contacts the fixed stop 373, the gear blank pushes the fixed stop 373 to move it into the fixed slot, and simultaneously squeezes the spring rod 372. When the gear blank is pushed to contact one end of the limit block 36, the gear blank crosses the fixed stop 373. At this time, under the action of the spring rod 372, the fixed stop 373 returns to its original position and closely adheres to the surface of the gear blank to limit and fix the gear blank, facilitating the rapid loading and unloading of the gear.

[0059] Step 3: Insert the C-shaped plate 31 into the furnace body 21. The C-shaped plate 31 causes the I-shaped plate 35 on the fixing plate 34 to drive the limit-fixed gear blank into the furnace body 21. When the concave surface of the arc-shaped plate 32 abuts against the outer ring wall of the furnace body 21, the horizontal section of the C-shaped plate 31 first contacts the inclined surface of the clamping plate 241, thereby pushing the clamping plate 241 to move upward to facilitate the entry of the C-shaped plate 31. When the limit slot is directly opposite to the clamping plate 241, under the reaction force of the moving spring 243, the end of the inclined surface of the clamping plate 241 is inserted into the limit slot on the C-shaped plate 31, thereby limiting and fixing the C-shaped plate 31 to prevent the C-shaped plate 31 from moving during the isothermal normalizing process. After inserting the C-shaped plate 31 completely into the furnace body 21, manually move the telescopic rod 251 so that the telescopic rod 251 is inserted into the spline slot opened on the lower rotating rod 33. At this time, start the driving motor 252, and the driving motor 252 drives one of the telescopic rods 251 to rotate. At this time, under the action of the chain ring 254, a plurality of sprockets 253 drive the telescopic rods 251 to rotate. The telescopic rods 251 cause the fixing plate 34 to drive the I-shaped plate 35 to rotate, and then drive the limit-fixed gear blank to rotate, so that the gear blank can be heated more evenly during the isothermal normalizing process.

[0060] In the fourth step, after the isothermal normalizing treatment of the gear blank, manually separate the telescopic rod 251 from the spline groove, and then start the bidirectional electric push rod. The bidirectional electric push rod makes the L-shaped plate 234 drive the upper and lower circular rods 231 to move relatively, so that the first round table block 232 on the circular rod 231 first contacts the moving block 246. During the downward movement of the first round table block 232, it pushes the moving block 246 to move horizontally along the rectangular through hole. Under the cooperation of the inclined surfaces of the moving block 246 and the rectangular through hole, the clamping plate 241 drives the moving block 242 to move away from the U-shaped plate 31, so that the clamping plate 241 first disengages from the limiting groove on the U-shaped plate 31. At this time, the circular rod 231 continues to move downward, so that the circular rod 231 drives the second round table block 233 to squeeze the structural plate 221, and the structural plate 221 drives the push plate 222 to move horizontally synchronously to push the U-shaped plate 31 out of the furnace body 21, realizing the synchronous blanking of all U-shaped plates 31, thereby improving the blanking efficiency of the equipment.

[0061] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The descriptions in the above embodiments and the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An isothermal normalizing process for gear forgings, characterized in that: The isothermal normalizing process of its gear forging specifically includes the following steps: S1. Forging and blanking: First, the blank for making the gear is subjected to hot die forging by a hot die forging press, and finally, the gear blank is manufactured by the method of upsetting blanking; S2. Gear placement: The gear blanks obtained in step S1 are placed batchwise on the fixing device (3); S3. Normalizing treatment: Finally, the fixing device (3) for fixing the gear blanks in step S2 is placed into the furnace loading device (2), and the gear blanks are subjected to normalizing treatment; When the isothermal normalizing process of the gear forging using the above steps S1 - S3 is carried out for isothermal normalizing of the gear forging, it also specifically involves an isothermal normalizing processing equipment for gear forgings, including a base (1). The base (1) is composed of a fixed bottom plate and four support legs. A furnace loading device (2) is installed on the top of the base (1), and a fixing device (3) is arranged inside the furnace loading device (2); The furnace loading device (2) includes a furnace body (21). The tops of the four support legs are jointly and fixedly installed with the furnace body (21). The furnace body (21) is in the shape of a hollow circular barrel structure. The side wall of the furnace body (21) is evenly provided with sliding grooves communicating with the center of the furnace body (21) along the circumferential direction. An annular plate (22) is installed at the central position inside the furnace body (21). Symmetric drive components (23) are symmetrically arranged at the top and bottom of the furnace body (21), and clamping components (24) evenly arranged along the circumferential direction of the furnace body (21) are symmetrically arranged at positions away from the center of the furnace body (21) at the top and bottom of the furnace body (21). A moving component (25) is also arranged at the bottom of the furnace body (21); The fixing device (3) includes a U-shaped plate (31). U-shaped plates (31) are slidably arranged in the sliding grooves opened along the circumferential direction of the furnace body (21). The open ends of the U-shaped plates (31) face away from the center of the furnace body (21), and arc-shaped plates (32) with inner concave surfaces contacting the outer ring walls are fixedly installed on them. One end of the arc-shaped plate (32) away from the outer ring wall of the furnace body (21) is fixedly installed with a handle. Limiting grooves are opened on the opposite surfaces of the two horizontal sections of the U-shaped plate (31). Heat dissipation holes are evenly opened on the vertical section of the U-shaped plate (31). A fixing plate (34) is jointly installed between the two horizontal sections of the U-shaped plate (31) through a rotatably connected rotating rod (33). A spline groove is opened at the bottom of the rotating rod (33) located at the lower side. A rectangular through groove is opened on the fixing plate (34). A plurality of I-shaped plates (35) in the shape of I are vertically slidably connected in the rectangular through groove. Placing grooves are evenly opened at the tops of the two vertical sections of the I-shaped plate (35). Limiting blocks (36) are rotatably arranged in the placing grooves through pin shafts. Placing components (37) for placing gear blanks are arranged on the limiting blocks (36). Insertion grooves communicating with the rectangular through groove and evenly arranged from top to bottom are symmetrically opened on both sides of the fixing plate (34). Insertion plates (38) for supporting the I-shaped plates (35) are slidably clamped in the insertion grooves corresponding to the positions of the I-shaped plates (35); The middle part of the annular plate (22) slides uniformly and horizontally along the circumferential direction and penetrates the structural plate (221); a push plate (222) is fixedly installed at one end of the structural plate (221) located outside the annular plate (22); the push plate (222) and the annular plate (22) are connected via a plurality of return springs (223); and the upper and lower sides of one end of the structural plate (221) located inside the annular plate (22) are both in an arc-shaped structure; The clamping assembly (24) comprises a clamping plate (241), the clamping plate (241) slides through the furnace body (21), one end of the clamping plate (241) located inside the furnace body (21) is inclined upward on a side away from the center of the furnace body (21), and a pressure plate (242) is fixedly installed on the side wall of one end of the clamping plate (241) located outside the furnace body (21), the pressure plate (242) and the furnace body (21) are connected by a movable spring (243), and a rectangular through hole is opened on the pressure plate (242), and the vertical cross section of the rectangular through hole is It is a right-angled trapezoidal structure with the small-diameter end facing away from the center of the furnace body (21) horizontally. A moving block (246) is provided at the top of the furnace body (21) and near the center of the furnace body (21) through a vertical plate (244) evenly arranged in the circumferential direction. One end of the vertical plate (244) away from the furnace body (21) is slidably connected in the moving block (246) through a push spring (245). One end of the moving block (246) is slidably connected to a rectangular through hole corresponding to its position, and the other end of the moving block (246) is connected to a driving assembly (23). The driving assembly (23) comprises a circular rod (231), the other end of the moving block (246) contacts the annular surface of the same No. 1 truncated cone block (232), the No. 1 truncated cone block (232) is sleeved on one end of the circular rod (231), the other end of the circular rod (231) slides through the furnace body (21) and is then installed with the No. 2 truncated cone block (233), an L-shaped plate (234) is installed on the circular rod (231), the No. 1 truncated cone block (232) on the same circular rod (231) is located between the No. 2 truncated cone block (233) and the circular rod (231), a fixed block (235) with a fixed bidirectional electric push rod is installed on the side wall of the furnace body (21), and the two moving ends of the bidirectional electric push rod are respectively fixedly connected to the vertical sections of the corresponding L-shaped plates (234).

2. The isothermal normalizing process for gear forgings according to claim 1, characterized in that: The moving assembly (25) comprises a telescopic rod (251), the bottom of the furnace body (21) is connected with the telescopic rod (251) in a circumferentially uniform sliding manner, one end of the telescopic rod (251) located in the furnace body (21) is plugged into a spline groove corresponding to its position, a driving motor (252) is fixedly mounted on the fixed bottom plate, the output shaft of the driving motor (252) is fixedly connected to one of the telescopic rods (251), the bottom of the remaining telescopic rods (251) is rotatably connected to the fixed bottom plate, and sprockets (253) are fixedly mounted on the telescopic rods (251), and the plurality of sprockets (253) are transmission-connected via chain rings (254).

3. The isothermal normalizing process for gear forgings according to claim 1, characterized in that: The placement assembly (37) comprises a hanging rod (371), and the limit blocks (36) are all fixed with hanging rods (371) for placing gears. A fixing groove is provided at one end of the hanging rod (371) away from the limit block (36), and two fixed blocks (373) are fixedly installed in the fixing groove via a spring rod (372). The opposite sides of the two hanging rods (371) form an eight-shaped structure with the small-diameter end away from the limit block (36).

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