CN105014141B - A kind of differential gear train-constant diameter cam type bar hot shearing mechanism - Google Patents

Abstract

The invention discloses a differential gear train-equal-diameter cam type bar material thermal shearing mechanism, which is characterized in that it includes a material placing platform and a bar material clamping device for horizontally installing heated bars, and a material setting platform There is a thermal shearing device on the side, and the thermal shearing device includes a support frame, a motor, a main shaft, a planetary body and a sun gear. In the frame body, a differential gear assembly is arranged between the main shaft, the planetary frame body, and the sun gear. The planetary frame body is connected with two planetary gears arranged symmetrically along the sun gear. The planetary gears are meshed with the sun gear. Each planetary gear There is an equal-diameter cam mechanism between the planet carrier body and each equal-diameter cam mechanism is equipped with a forming tool; the advantage is that when the bar is cut off, the end of the heated bar is extruded and deformed to form a Specific shape, high material utilization rate, high production efficiency, and simple structure of the whole mechanism.

Description

A Differential Gear Train—Equal Diameter Cam Bar Thermal Shearing Mechanism

technical field

The present invention relates to the thermal forming mechanism of the end of the bar in the field of plastic forming and mechanical processing, in particular to a differential gear train for processing the end of the heated bar into a specific shape—equal diameter cam type bar thermal shear cutting agencies.

Background technique

During the cross wedge rolling forming process, the irregular flow of the metal will cause concavities to appear at both ends of the rolled piece when it is finally formed, and the concavities must be cut off as waste heads, which leads to the general yield rate of the cross wedge rolling process. Below 85%. The original billet of the rolled piece is usually a cylindrical rod. Changing the shape of the end of the bar, such as processing the end of the bar into a conical, frustum-shaped, arc-shaped, etc., can greatly improve the utilization rate of the rolled material. It is currently the most effective and most versatile process for realizing headless cross wedge rolling. However, in actual production, the end shape of the bar is generally processed by cutting or forging, and the waste still exists during cutting, and the production efficiency of forging is relatively low, so the current methods cannot meet the production requirements well. And the material waste is bigger.

Contents of the invention

The technical problem to be solved by the present invention is to provide a differential gear train with a high material utilization rate, high production efficiency and a relatively simple structure - an equal diameter cam type bar thermal shearing mechanism.

The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a differential gear system-equal-diameter cam type bar thermal shearing mechanism, including a material placement platform and a bar clamp for horizontally installing the heated bar device, one side of the material placement platform is provided with a thermal shearing device for cutting the bar while processing the end of the heated bar into a specific shape, and the thermal shearing device includes a support frame, a motor, The main shaft, the planet carrier body and the sun gear, the motor is fixed, the main shaft is connected to the support frame, the main shaft is coaxially fixedly connected with the drive shaft of the motor, the The sun gear of the sun gear is located in the planet carrier body, a differential gear assembly is arranged between the main shaft, the planet carrier body, and the sun gear, and two along the Said planetary gears are arranged symmetrically to the sun gear, said planetary gears are meshed with said sun gears, and an equal-diameter cam mechanism is arranged between each said planetary gear and said planet carrier body, both The two equal-diameter cam mechanisms are arranged symmetrically along the sun gear, and each of the equal-diameter cam mechanisms is provided with a forming tool.

The differential wheel assembly includes a first driving gear, a second driving gear, a first driven gear and a second driven gear, and the first driving gear and the second driving gear are respectively connected to the The main shaft is fixedly connected coaxially, the first driven gear is fixedly connected coaxially with the sun gear, the first driven gear meshes with the first driving gear, and the second driven gear The driven gear is coaxially and fixedly connected with the planet carrier body, and the second driven gear is meshed with the second driving gear.

The differential gear train-equal-diameter cam type bar thermal shearing mechanism includes a horizontally arranged unloading cylinder, the sun gear and the first driven gear are respectively coaxially fixedly connected to the On the above-mentioned stripping cylinder, the front end of the stripping cylinder is open. During processing, the bar material is inserted into the stripping cylinder, and the rear end of the stripping cylinder is integrally provided with a rear-end opening. The cone barrel is convenient for the falling of the processed bar. After one processing is completed, the cut bar falls into the return barrel, and at the same time, the pressing plate moves to release the remaining bar, and the remaining bar is pushed to the right. , the bars falling into the ejection barrel are pushed to the cone barrel, and with the continuous rotation of the ejection barrel, the processed bars fall from the cone barrel.

The gear ratio between the sun gear and the planetary gear is 1:1, the transmission ratio between the first driving gear and the first driven gear is 7:6 or 8:7, the The transmission ratio between the second driving gear and the second driven gear is 1:1.

The equal-diameter cam mechanism includes a connecting frame and an equal-diameter cam, and the planetary shaft is coaxially fixed on the planetary wheel, and the planetary shaft is pivotally connected to the planetary carrier body and its end protrudes from the The above-mentioned planet carrier body, the said equal-diameter cam is located on the outside of the planet carrier body and is fixedly connected with the planet shaft, and the end surface of the planet carrier body facing the said equal-diameter cam is fixedly arranged with Two radially extending slideways, the two ends of the connecting frame are respectively fixed with sliders, and the sliding blocks are radially slidably matched with the slideways at the corresponding ends, and the two ends of the connecting frame are respectively axially connected There are rollers, and the rollers are rollingly matched with the contour surface of the equal-diameter cam, and the contact points between the two rollers and the contour surface of the equal-diameter cam are respectively located between the planet shaft and the On both sides of the fixed point of the equal-diameter cam, the contact points between the two rollers and the profile surface of the equal-diameter cam and the three points of the planetary shaft and the fixed point of the equal-diameter cam are located on the same diameter. On the straight line, the forming tool is fixedly connected with the connecting frame.

The forming tool is disc-shaped, and the circumferential surface of the forming tool is divided into a first processing surface and a second processing surface along its transverse bisecting plane, and the first processing surface and the second processing surface are along the The transverse bisector is arranged symmetrically, the shape of the first processing surface and the shape of the second processing surface are the same as the shape to be processed at the end of the bar; the forming tool cuts the bar while The end of the heated bar is machined into a specific shape.

The upper end of the material placement platform is provided with a concave lower V-shaped groove for horizontally placing heated bars, and the bar clamping device includes a pressing plate and a vertically fixed first hydraulic cylinder. The pressing plate is located above the material placement platform, and the lower end surface of the pressing plate is provided with a concave upper V-shaped groove corresponding to the lower V-shaped groove. The first hydraulic cylinder The driving shaft is fixedly connected with the pressing plate, and is used to drive the pressing plate to move up and down.

The other side of the material placement platform is provided with an automatic quantitative pushing mechanism, which can realize the automatic feeding of the remaining bars when one-time processing of the bars is completed.

The automatic quantitative pushing mechanism includes a horizontally fixed second hydraulic cylinder, and the drive shaft of the second hydraulic cylinder is fixedly provided with a push plate for pushing the bar to move.

Compared with the prior art, the advantage of the present invention is that the thermal shearing device in this mechanism adopts the combined transmission of the differential gear train and the equal-diameter cam mechanism, and when the equal-diameter cam rotates relative to the planet carrier body, it drives the forming tool to move radially, In this way, the uniform rotation of the planet carrier body is transformed into the radial feed of the forming tool while rotating around the heated bar, and the end of the heated bar is extruded and deformed to form a specific shape while cutting the bar. The shape, such as conical, truncated cone, arc, etc., provides high-quality original bar for cross wedge rolling without head rolling, and has high material utilization rate and high production efficiency, and the structure of the whole mechanism is relatively simple.

Description of drawings

FIG. 1 is a schematic structural view of Embodiment 1 of the present invention;

Fig. 2 is a schematic structural view of the forming tool in Embodiment 1 of the present invention;

Fig. 3 is a structural schematic diagram of an equal-diameter cam mechanism in Embodiment 1 of the present invention;

Fig. 4 is a schematic front view of an equal-diameter cam mechanism in Embodiment 1 of the present invention;

Fig. 5 is a schematic diagram of the cooperation of the material placement platform, the pressing plate and the bar in the first embodiment of the present invention;

FIG. 6 is a schematic structural diagram of Embodiment 2 of the present invention;

FIG. 7 is a schematic structural diagram of Embodiment 3 of the present invention;

FIG. 8 is a schematic structural diagram of Embodiment 4 of the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Embodiment 1: As shown in the figure, a differential gear train-equal-diameter cam type bar thermal shearing mechanism includes a material placement platform 1 and a bar clamping device for horizontally installing a heated bar 100, The upper end of the material placement platform 1 is provided with a concave lower V-shaped groove 11 for horizontally placing the heated bar 100. The bar clamping device includes a pressing plate 2 and a vertically fixed first hydraulic cylinder 3. The pressing plate 2 is located at Above the material placement platform 1, the lower end surface of the pressing plate 2 is provided with a concave upper V-shaped groove 21 corresponding to the lower V-shaped groove 11, and the drive shaft of the first hydraulic cylinder 3 is fixedly connected with the pressing plate 2. Drive the platen 2 to move up and down, and one side of the material placement platform 1 is provided with a thermal shearing device for cutting the bar 100 and processing the end of the heated bar 100 into a specific shape. The thermal shearing device includes a support frame 4 , motor 5, main shaft 6, planet carrier body 7 and sun gear 71, motor 5 is fixed, main shaft 6 is connected on the support frame 4, main shaft 6 is coaxially fixedly connected with the drive shaft of motor 5, and sun gear 71 is located on the planet In the frame body 7, a differential gear assembly is arranged between the main shaft 6, the planetary frame body 7, and the sun gear 71. The differential gear assembly includes a first driving gear 61, a second driving gear 62, a first driven gear 63 and a second driving gear. Two driven gears 64, the first driving gear 61 and the second driving gear 62 are respectively coaxially fixedly connected with the main shaft 6, the first driven gear 63 is coaxially fixedly connected with the sun gear 71, the first driven gear 63 is connected with the first The driving gear 61 is meshed, the transmission ratio of the first driving gear 61 and the first driven gear 63 is 7:6 or 8:7, the second driven gear 64 is coaxially fixedly connected with the planet carrier body 7, and the second driven gear The gear 64 meshes with the second driving gear 62, the transmission ratio of the second driving gear 62 and the second driven gear 64 is 1:1, and the planet carrier body 7 is provided with two planetary gears 72 arranged symmetrically along the sun gear 71 The planetary shaft 73 is coaxially fixed on the planetary wheel 72, the planetary shaft 73 is connected to the planetary frame body 7 and its end extends out of the planetary frame body 7, the planetary wheel 72 meshes with the sun wheel 71, and the sun wheel 71 and the planetary The gear ratio of the wheel 72 is 1:1, and an equal-diameter cam mechanism is arranged between each planetary shaft 73 and the planet carrier body 7. Two equal-diameter cam mechanisms are arranged symmetrically along the sun gear 71. The equal-diameter cam mechanism includes a connecting frame 8 and an equal-diameter cam 81, the equal-diameter cam 81 is located on the outer side of the planetary carrier body 7 and is fixedly connected with the planetary shaft 73, and the end surface of the planetary carrier body 7 facing the equal-diameter cam 81 is fixedly provided with two radially extending slideways 82 , the two ends of the connecting frame 8 are respectively fixedly provided with sliders 83, the sliding blocks 83 and the slideways 82 at the corresponding ends are radially slidingly matched, and the two ends of the connecting frame 8 are respectively axially connected with rollers 84, and the rollers 84 and the equal diameter cam 81 Contour surface rolling fit, two rollers 84 and the contact point A of the contour surface of equal diameter cam 81, B are respectively positioned at the both sides of fixed point O of planetary shaft 73 and equal diameter cam 81, two rollers 84 and equal diameter cam 81 The contact points A, B of the profile surface and the fixed point O of the planet shaft 73 and the equal-diameter cam 81 are located on the same radial straight line, and the connecting frame 8 is fixedly connected with a Forming cutter 9, forming cutter 9 is disc-shaped, and the circumferential surface of forming cutter 9 is divided into first processing surface 92 and second processing surface 93 along its transverse bisection plane 91, and first processing surface 92 and second processing surface 93 are along transverse direction The bisecting plane 91 is arranged symmetrically, and the shape of the first processing surface 92 and the shape of the second processing surface 93 are the same as the shape to be processed at the end of the bar 100 .

Embodiment 2: As shown in the figure, a differential gear train-equal-diameter cam type bar stock thermal shearing mechanism includes a horizontally arranged return cylinder 10 and a material placement platform for horizontally installing heated bar stock 100 1 and a bar clamping device, the upper end of the material placement platform 1 is provided with a concave lower V-shaped groove 11 for horizontally placing the heated bar 100, and the bar clamping device includes a pressing plate 2 and a vertically fixed first A hydraulic cylinder 3, the pressure plate 2 is located above the material placement platform 1, and the lower end surface of the pressure plate 2 is provided with an upper V-shaped groove 21 that is concave and corresponding to the lower V-shaped groove 11. The drive of the first hydraulic cylinder 3 The shaft is fixedly connected with the pressing plate 2, and is used to drive the pressing plate 2 to move up and down. One side of the material placement platform 1 is provided with a thermal shearing device for cutting the bar 100 and processing the end of the heated bar 100 into a specific shape. The thermal shearing device includes a support frame 4, a motor 5, a main shaft 6, a planet carrier body 7 and a sun gear 71, the motor 5 is fixed, the main shaft 6 is connected to the support frame 4, and the main shaft 6 is coaxial with the drive shaft of the motor 5 Fixedly connected, the sun gear 71 is located in the planet carrier body 7, and a differential gear assembly is arranged between the main shaft 6, the planet carrier body 7, and the sun gear 71. The differential wheel assembly includes a first driving gear 61, a second driving gear 62, The first driven gear 63 and the second driven gear 64, the first driving gear 61 and the second driving gear 62 are respectively coaxially fixedly connected with the main shaft 6, and the first driven gear 63 is coaxially fixedly connected with the sun gear 71 respectively. On the return cylinder 10, the first driven gear 63 meshes with the first driving gear 61, the transmission ratio of the first driving gear 61 and the first driven gear 63 is 7:6 or 8:7, and the second driven gear 64 is coaxially fixedly connected with the planet carrier body 7, the second driven gear 64 meshes with the second driving gear 62, the transmission ratio of the second driving gear 62 and the second driven gear 64 is 1:1, and the planet carrier body 7 There are two planetary gears 72 arranged symmetrically along the sun gear 71 inside. The planetary shafts 73 are coaxially fixed on the planetary gears 72. The planetary shafts 73 are pivotally connected to the planetary carrier body 7 and the ends extend out from the planetary carrier body 7. The planetary gear 72 meshes with the sun gear 71, and the gear ratio between the sun gear 71 and the planetary gear 72 is 1:1. An equal-diameter cam mechanism is arranged between each planetary shaft 73 and the planet carrier body 7, and two equal-diameter cams The mechanism is arranged symmetrically along the sun gear 71. The equal-diameter cam mechanism includes a connecting frame 8 and an equal-diameter cam 81. The equal-diameter cam 81 is located outside the planetary carrier body 7 and is fixedly connected to the planetary shaft 73. The planetary carrier body 7 faces the equal-diameter cam 81. Two radially extending slideways 82 are fixedly arranged on the end face of the connecting frame 8, and sliders 83 are respectively fixedly arranged at both ends of the connecting frame 8. The rollers 84 are axially connected respectively, and the rollers 84 are rollingly matched with the contour surface of the equal diameter cam 81. The contact points A and B of the two rollers 84 and the contour surface of the equal diameter cam 81 are located at the fixed position of the planetary shaft 73 and the equal diameter cam 81 respectively. On both sides of point O, the contact points A and B between the two rollers 84 and the contour surface of the equal-diameter cam 81 and the fixed point O of the planetary shaft 73 and the equal-diameter cam 81 are three points On the same radial line, the connecting frame 8 is fixedly connected with a forming tool 9, the forming tool 9 is disc-shaped, and the circumferential surface of the forming tool 9 is divided into a first processing surface 92 and a second processing surface 93 along its transverse bisecting plane 91. , the first processing surface 92 and the second processing surface 93 are arranged symmetrically along the transverse bisector 91, the shape of the first processing surface 92 and the shape of the second processing surface 93 are the same as the shape to be processed at the end of the bar 100, and the material is returned The front end of the barrel 10 is open, and during processing, the bar stock 100 is stretched into the return barrel 10, and the rear end of the return barrel 10 is integrally provided with a cone barrel 101 which is convenient for the processed bar stock to drop.

Embodiment 3: As shown in the figure, a differential gear train-equal-diameter cam type bar thermal shearing mechanism includes a material placement platform 1 and a bar clamping device for horizontally installing a heated bar 100, The upper end of the material placement platform 1 is provided with a concave lower V-shaped groove 11 for horizontally placing the heated bar 100. The bar clamping device includes a pressing plate 2 and a vertically fixed first hydraulic cylinder 3. The pressing plate 2 is located at Above the material placement platform 1, the lower end surface of the pressing plate 2 is provided with a concave upper V-shaped groove 21 corresponding to the lower V-shaped groove 11, and the drive shaft of the first hydraulic cylinder 3 is fixedly connected with the pressing plate 2. Drive the platen 2 to move up and down, and one side of the material placement platform 1 is provided with a thermal shearing device for cutting the bar 100 and processing the end of the heated bar 100 into a specific shape. The thermal shearing device includes a support frame 4 , motor 5, main shaft 6, planet carrier body 7 and sun gear 71, motor 5 is fixed, main shaft 6 is connected on the support frame 4, main shaft 6 is coaxially fixedly connected with the drive shaft of motor 5, and sun gear 71 is located on the planet In the frame body 7, a differential gear assembly is arranged between the main shaft 6, the planetary frame body 7, and the sun gear 71. The differential gear assembly includes a first driving gear 61, a second driving gear 62, a first driven gear 63 and a second driving gear. Two driven gears 64, the first driving gear 61 and the second driving gear 62 are respectively coaxially fixedly connected with the main shaft 6, the first driven gear 63 is coaxially fixedly connected with the sun gear 71, the first driven gear 63 is connected with the first The driving gear 61 is meshed, the transmission ratio of the first driving gear 61 and the first driven gear 63 is 7:6 or 8:7, the second driven gear 64 is coaxially fixedly connected with the planet carrier body 7, and the second driven gear The gear 64 meshes with the second driving gear 62, the transmission ratio of the second driving gear 62 and the second driven gear 64 is 1:1, and the planet carrier body 7 is provided with two planetary gears 72 arranged symmetrically along the sun gear 71 The planetary shaft 73 is coaxially fixed on the planetary wheel 72, the planetary shaft 73 is connected to the planetary frame body 7 and its end extends out of the planetary frame body 7, the planetary wheel 72 meshes with the sun wheel 71, and the sun wheel 71 and the planetary The gear ratio of the wheel 72 is 1:1, and an equal-diameter cam mechanism is arranged between each planetary shaft 73 and the planet carrier body 7. Two equal-diameter cam mechanisms are arranged symmetrically along the sun gear 71. The equal-diameter cam mechanism includes a connecting frame 8 and an equal-diameter cam 81, the equal-diameter cam 81 is located on the outer side of the planetary carrier body 7 and is fixedly connected with the planetary shaft 73, and the end surface of the planetary carrier body 7 facing the equal-diameter cam 81 is fixedly provided with two radially extending slideways 82 , the two ends of the connecting frame 8 are respectively fixedly provided with sliders 83, the sliding blocks 83 and the slideways 82 at the corresponding ends are radially slidingly matched, and the two ends of the connecting frame 8 are respectively axially connected with rollers 84, and the rollers 84 and the equal diameter cam 81 Contour surface rolling fit, two rollers 84 and the contact point A of the contour surface of equal diameter cam 81, B are respectively positioned at the both sides of fixed point O of planetary shaft 73 and equal diameter cam 81, two rollers 84 and equal diameter cam 81 The contact points A, B of the profile surface and the fixed point O of the planet shaft 73 and the equal-diameter cam 81 are located on the same radial straight line, and the connecting frame 8 is fixedly connected with a Forming cutter 9, forming cutter 9 is disc-shaped, and the circumferential surface of forming cutter 9 is divided into first processing surface 92 and second processing surface 93 along its transverse bisection plane 91, and first processing surface 92 and second processing surface 93 are along transverse direction The bisecting surface 91 is arranged symmetrically, the shape of the first processing surface 92 and the shape of the second processing surface 93 are the same as the shape to be processed at the end of the bar 100, and the other side of the loading platform 1 is provided with an automatic quantitative pushing mechanism, The automatic quantitative pushing mechanism includes a horizontally fixed second hydraulic cylinder 12 , and a push plate 13 for pushing the bar 100 to move is fixedly arranged on the drive shaft of the second hydraulic cylinder 12 .

Embodiment 4: As shown in the figure, a differential gear train-equal-diameter cam-type bar material thermal shearing mechanism is set on the other side of the material placement platform 1 on the basis of the structure shown in Embodiment 2 There is an automatic quantitative pushing mechanism, and the automatic quantitative pushing mechanism includes a horizontally fixed second hydraulic cylinder 12, and a push plate 13 for pushing the bar 100 to move is fixedly arranged on the drive shaft of the second hydraulic cylinder 12.

Claims (8)

1. A differential gear train-equal diameter cam type bar thermal shearing mechanism is characterized in that it includes a material placement platform and a bar clamping device for horizontally installed heated bars, and the described material placement platform One side is provided with a thermal shearing device for shearing the bar while processing the end of the heated bar into a specific shape. The thermal shearing device includes a support frame, a motor, a main shaft, a planet carrier body and a sun gear , the motor is fixed, the main shaft is connected to the support frame, the main shaft is coaxially fixedly connected with the drive shaft of the motor, and the sun gear is located on the planet In the carrier body, a differential gear assembly is arranged between the main shaft, the planetary carrier body, and the sun gear, and two shafts arranged symmetrically along the sun gear are pivoted in the planetary carrier body. Planetary gears, the planetary gears are meshed with the sun gears, and an equal-diameter cam mechanism is arranged between each of the planetary gears and the planet carrier body, and two of the equal-diameter cam mechanisms It is arranged symmetrically along the sun gear, and each of the equal-diameter cam mechanisms is provided with a forming tool. The said equal-diameter cam mechanism includes a connecting frame and an equal-diameter cam, and the coaxial fixed arrangement on the planetary gears There is a planetary shaft, the planetary shaft is connected in the planetary carrier body and the end part protrudes from the planetary carrier body, the equal-diameter cam is located outside the planetary carrier body and is connected to the planetary carrier body The planetary shaft is fixedly connected, and the end surface of the planet carrier body facing the equal-diameter cam is fixedly provided with two radially extending slideways, and the two ends of the connecting frame are respectively fixedly provided with sliders, so The slide block described above is radially slidably matched with the slideway at the corresponding end, and the two ends of the connecting frame are respectively axially connected with rollers, and the rollers are rolled and matched with the contour surface of the equal-diameter cam. The contact points of the rollers and the contour surface of the equal-diameter cam are respectively located on both sides of the fixed point of the planetary shaft and the said equal-diameter cam, and the contours of the two rollers and the said equal-diameter cam The contact point of the surface and the fixed point of the planet shaft and the equal-diameter cam are located on the same radial straight line, and the forming tool is fixedly connected with the connecting frame. 2. A differential gear train as claimed in claim 1 - equal diameter cam type bar thermal shearing mechanism, characterized in that said differential gear assembly includes a first driving gear, a second driving gear, a first The driven gear and the second driven gear, the first driven gear and the second driven gear are respectively coaxially fixedly connected with the main shaft, and the first driven gear is connected with the sun gear coaxial fixed connection, the first driven gear is meshed with the first driving gear, the second driven gear is coaxial and fixed connected with the planet carrier body, and the second driven gear is The driving gear meshes with the second driving gear. 3. A kind of differential gear train as claimed in claim 2-equal diameter cam type bar thermal shearing mechanism, it is characterized in that comprising the unloading cylinder that is arranged horizontally, described sun gear and described first follower The moving gears are coaxially fixedly connected to the stripping barrel respectively, and the front end of the stripping barrel is open. During processing, the bar material is inserted into the stripping barrel, and the strip of the stripping barrel is The rear end is integrally provided with a cone with an open rear end, which facilitates the dropping of processed bars. 4. A differential gear train-equal cam type bar thermal shearing mechanism as claimed in claim 2, characterized in that the gear ratio between the sun gear and the planet gear is 1:1, so The transmission ratio between the first driving gear and the first driven gear is 7:6 or 8:7, and the transmission ratio between the second driving gear and the second driven gear is 1:1 . 5. A kind of differential gear train as claimed in claim 1-equal diameter cam type bar thermal shearing mechanism, it is characterized in that described forming tool is disc-shaped, and the circumferential surface of described forming tool is along its The transverse bisector is divided into a first processing surface and a second processing surface, the first processing surface and the second processing surface are arranged symmetrically along the transverse bisector, the shape of the first processing surface and The shape of the second processing surface is the same as the shape to be processed at the end of the bar. 6. A differential gear train-equal-diameter cam-type bar thermal shearing mechanism as claimed in claim 1, characterized in that the upper end of the material placement platform is provided with a concave for horizontally placed heated The lower V-shaped groove of the bar stock, the bar stock clamping device includes a press plate and a vertically fixed first hydraulic cylinder, the press plate is located above the material placement platform, and the lower end surface of the press plate An upper V-shaped groove that is concave and corresponding to the lower V-shaped groove is provided, and the drive shaft of the first hydraulic cylinder is fixedly connected with the pressure plate for driving the pressure plate to move up and down . 7. A differential gear train-equal cam type bar thermal shearing mechanism as claimed in claim 1 or 3, characterized in that an automatic quantitative pushing mechanism is provided on the other side of the material placement platform. 8. A differential gear train-equal cam type bar thermal shearing mechanism as claimed in claim 7, characterized in that said automatic quantitative pushing mechanism comprises a horizontally fixed second hydraulic cylinder, said The drive shaft of the second hydraulic cylinder is fixedly provided with a push plate for pushing the bar to move.