阅读说明：本技术 一种微碟形外齿摩擦片成形淬火工装及方法 (Micro-dish-shaped external tooth friction plate forming quenching tool and method ) 是由 刘克 杨兵 宋海锋 莫竞芳 王倩 蒋秋娥 毕丹 向臻东 于 2019-10-18 设计创作，主要内容包括：本发明公开了一种微碟形外齿摩擦片成形淬火工装及方法,工装包括膨胀顶杆、压模、成形模、顶头、底座、多个滑块、弹簧B和滑动螺栓；成形模置于底座上,压模压在成形模上,压模底面和成形模顶面为相互配合的锥面；成形模侧壁内沿轴线方向设有顶料装置；所述的多个滑块底部置于底座上,滑动螺栓中部滑动部置于底座侧壁的螺栓孔内,滑动螺栓的螺纹端与滑块螺接,滑动螺栓上设有弹簧B；多个滑块围成芯模,芯模顶部为圆锥形孔、下部为圆形阶梯孔；膨胀顶杆位于芯模正上方,膨胀顶杆底部为锥形。本发明结构简单,操作方便,生产效率高,装卸模方便,能够保证微碟形外齿摩擦片成形精度,且能提高微碟形外齿摩擦片淬火硬度均匀性。(The invention discloses a micro-disc-shaped external tooth friction plate forming quenching tool and a method, wherein the tool comprises an expansion ejector rod, a pressing die, a forming die, an ejector head, a base, a plurality of sliding blocks, a spring B and a sliding bolt; the forming die is arranged on the base, the pressing die is pressed on the forming die, and the bottom surface of the pressing die and the top surface of the forming die are conical surfaces which are matched with each other; a material ejecting device is arranged in the side wall of the forming die along the axial direction; the bottoms of the sliding blocks are arranged on the base, the sliding part in the middle of the sliding bolt is arranged in a bolt hole in the side wall of the base, the threaded end of the sliding bolt is in threaded connection with the sliding blocks, and the sliding bolt is provided with a spring B; the plurality of sliding blocks enclose a core mould, the top of the core mould is a conical hole, and the lower part of the core mould is a circular stepped hole; the expansion ejector rod is positioned right above the core mold, and the bottom of the expansion ejector rod is conical. The invention has simple structure, convenient operation, high production efficiency and convenient die assembly and disassembly, can ensure the forming precision of the micro-dish-shaped external tooth friction plate and can improve the quenching hardness uniformity of the micro-dish-shaped external tooth friction plate.)

1. a micro-dish-shaped outer tooth friction plate forming quenching tool is characterized in that: the device comprises an expansion ejector rod (1), a pressing die (2), a forming die (3), an ejector head (4), an ejection device, a base (7), a plurality of sliding blocks (8), a spring B (9) and a sliding bolt (10); the forming die (3) is arranged on the base (7), the pressing die (2) is pressed on the forming die (3), and the bottom surface of the pressing die (2) and the top surface of the forming die (3) are conical surfaces which are matched with each other; a material ejecting device is arranged in the side wall of the forming die (3) along the axis direction; the bottoms of the sliding blocks (8) are arranged on the base (7) and connected with the side wall of the base (7) through sliding bolts (10), the sliding part in the middle of each sliding bolt (10) is arranged in a bolt hole (74) in the side wall of the base (7), the threaded end of each sliding bolt (10) is in threaded connection with the corresponding sliding block (8), a spring B (9) is sleeved on each sliding bolt (10), and the spring B (9) is arranged between each sliding block (8) and the side wall of the base (7); a plurality of sliding blocks (8) enclose a core mould, the top of the core mould is a conical hole, and the lower part of the core mould is a circular stepped hole; the expansion ejector rod (1) is positioned right above the core mold, and the bottom of the expansion ejector rod (1) is conical.

2. The forming and quenching tool for the micro-disc-shaped external tooth friction plate as claimed in claim 1, which is characterized in that: the forming die (3) is of an annular structure, the side wall of the forming die is provided with a plurality of through holes, and the through holes are uniformly distributed along the circumferential direction; be equipped with an liftout device in every through-hole, the liftout device include top (4), spring A (5) and connecting rod (6), top (4) are connected through spring A (5) and connecting rod (6), top (4) set up, top (4) are higher than the through-hole top surface.

3. the forming and quenching tool for the micro-disc-shaped external tooth friction plate as claimed in claim 1, which is characterized in that: the bottom surface of the pressing die (2) is conical, the cone angle is 179 degrees, 32 oil grooves I are formed in the bottom surface of the pressing die (2), the width of each oil groove I is 4mm, and each oil groove I is arranged along the radius direction and penetrates through the side wall of the whole pressing die (2); the top surface of the forming die (3) is matched with the bottom surface of the pressing die (2), 32 oil grooves II (31) are arranged on the top surface of the forming die (3), the width of each oil groove II is 4mm, each oil groove II is arranged along the radius direction, each oil groove II (31) does not penetrate through the side wall of the forming die (3), and each oil groove II and each oil groove I are staggered.

4. the forming and quenching tool for the micro-disc-shaped external tooth friction plate as claimed in claim 2, which is characterized in that: the diameter of the steel wire of the spring A (5) is phi 1.2mm, the outer diameter of the steel wire is phi 9.2mm, the pitch is 2.6mm, and the rigidity is 8000N/m; the height of the top (4) above the forming die (3) is 5 mm.

5. the forming and quenching tool for the micro-disc-shaped external tooth friction plate as claimed in claim 2, which is characterized in that: the top surface of the base (7) is provided with a plurality of convex blocks (73) for positioning the forming die and 2 lifting bolt holes (72), and the plurality of convex blocks (73) are arranged close to the inner hole of the base (7); be equipped with 28 oil grooves (71) on base (7) top surface, oil groove (71) width is 4 mm.

6. The forming and quenching tool for the micro-disc-shaped external tooth friction plate according to claim 1, characterized in that: the sliding block (8) is made of 20Cr2Ni4A alloy steel, the hardness of the sliding block (8) is 43HRC, and the hardness of the working surface is more than or equal to 59 HRC; the inclined conical surface at the top of the sliding block (8) is subjected to grinding treatment, the precision is higher than IT6 level, and the roughness is less than or equal to Ra0.8.

7. the forming and quenching tool for the micro-disc-shaped outer tooth friction plate according to claim 1 or 6, characterized in that: the expansion ejector rod (1) is made of medium carbon alloy steel, the hardness is 32HRC, the bottom conical surface is subjected to induction quenching treatment, and the hardness of the bottom conical surface is more than or equal to 56 HRC; the bottom conical surface of the expansion ejector rod (1) is ground, the precision is higher than IT6 level, and the roughness is less than or equal to Ra0.8.

8. a forming and quenching method for a micro-disc-shaped external tooth friction plate by using the forming and quenching tool for the micro-disc-shaped external tooth friction plate as claimed in any one of claims 1 to 7 comprises the following processing steps:

1) setting machine tool pressure quenching parameters;

2) Heating the friction plate in a mesh belt atmosphere furnace or a box-type atmosphere furnace, wherein the furnace loading mode is that the friction plate is horizontally placed in a single layer mode, and heating and heat preservation are carried out;

3) Taking out the friction plate in the red hot state and sleeving the friction plate into a core mold surrounded by a plurality of sliding blocks;

4) Starting the quenching machine tool, and automatically and accurately positioning the friction plate under the action of a core mold formed by enclosing the expansion ejector rod and the plurality of slide blocks; the friction plate is formed into a micro-disk shape and quenched under the action of the pressing die and the forming die;

5) And (4) after cooling, opening the press, taking the friction plate out of the core mold, tempering, and performing oxidation treatment after tempering.

9. The forming quenching method for the micro-disc-shaped outer tooth friction plate according to claim 8, wherein specific parameters of press quenching of a machine tool in the step 1) are as follows: the pressure applied to the expansion ejector rod is 2400lbs and is constant; applied to a die pressure of 3600lbs, a pulsation frequency of 40 HZ; keeping the pressure for 0.5 min; the oil flow was 606 l.min.

10. The method for forming and quenching the micro-disc-shaped outer tooth friction plate according to claim 8 or 9, wherein in the step 2), the heating temperature is 820-840 ℃, and the holding time is about 10 min; the tempering temperature in step 5) is 540 ℃.

Technical Field

The invention belongs to the technical field of forming of dish-shaped external tooth friction plates, and particularly relates to a forming and quenching tool and method for a micro dish-shaped external tooth friction plate.

background

The micro-disc-shaped external tooth friction plate is a part in a clutch of a comprehensive transmission device of a tracked vehicle, is made of 65Mn, has the hardness requirement of 28-35HRC, the thickness of 2mm, an inner hole and external tooth structure, the inner diameter of phi 172mm, the middle diameter of phi 251mm, the outer diameter (the diameter of a tooth part) of phi 265mm and the disc shape requirement of 0.3-0.5 mm. Because the disk shape of the part is very small, the diaphragm spring oil quenching scheme in the automobile industry is adopted, the part is directly contacted with residual oil on a die in a large area before quenching, so that ignition or local hardening before quenching is caused, the quenching process cannot be normally carried out, the disk shape cannot meet the design requirement, and the hardness uniformity is very poor.

Disclosure of Invention

In order to solve the technical problems, the invention provides a micro-dish-shaped external tooth friction plate forming quenching tool and a micro-dish-shaped external tooth friction plate forming quenching method which are simple in structure, convenient to operate, high in production efficiency and convenient to assemble and disassemble a die, and the micro-dish-shaped external tooth friction plate forming quenching tool and the micro-dish-shaped external tooth friction plate forming quenching method can guarantee the forming precision of the micro-dish-shaped external tooth friction plate and.

The technical scheme adopted by the invention is as follows: a micro-disc-shaped outer tooth friction plate forming and quenching tool comprises an expansion ejector rod, a pressing die, a forming die, an ejector head, an ejector device, a base, a plurality of sliding blocks, a spring B and a sliding bolt; the forming die is arranged on the base, the pressing die is pressed on the forming die, and the bottom surface of the pressing die and the top surface of the forming die are conical surfaces which are matched with each other; a material ejecting device is arranged in the side wall of the forming die along the axial direction; the bottoms of the sliding blocks are arranged on the base and connected with the side wall of the base through sliding bolts, the sliding part in the middle of each sliding bolt is arranged in a bolt hole in the side wall of the base, the threaded end of each sliding bolt is in threaded connection with the corresponding sliding block, a spring B is sleeved on each sliding bolt and arranged between the corresponding sliding block and the side wall of the base; the plurality of sliding blocks enclose a core mould, the top of the core mould is a conical hole, and the lower part of the core mould is a circular stepped hole; the expansion ejector rod is positioned right above the core mold, and the bottom of the expansion ejector rod is conical.

According to the forming and quenching tool for the micro-dish-shaped external tooth friction plate, the forming die is of an annular structure, a plurality of through holes are formed in the side wall of the forming die, and the through holes are uniformly distributed along the circumferential direction; be equipped with an liftout device in every through-hole, the liftout device include top, spring A and connecting rod, the top passes through spring A and connects with the connecting rod, the top sets up, the top exceeds the through-hole top surface.

According to the micro-dish-shaped external tooth friction plate forming and quenching tool, the bottom surface of the pressing die is conical, the cone angle is 179 degrees, 32 oil grooves I are formed in the bottom surface of the pressing die, the width of each oil groove I is 4mm, and each oil groove I is arranged along the radius direction and penetrates through the side wall of the whole pressing die; the top surface of the forming die is matched with the bottom surface of the pressing die, 32 oil grooves II are formed in the top surface of the forming die, the width of each oil groove II is 4mm, each oil groove II is arranged along the radius direction, the oil grooves II do not penetrate through the side wall of the forming die, and the oil grooves II and the oil grooves I are staggered mutually.

according to the micro-dish-shaped external tooth friction plate forming and quenching tool, the diameter of the steel wire of the spring A is phi 1.2mm, the outer diameter of the steel wire is phi 9.2mm, the pitch is 2.6mm, and the rigidity is 8000N/m; the height of the top exceeding the forming die is 5 mm.

according to the micro-dish-shaped outer tooth friction plate forming and quenching tool, the top surface of the base is provided with a plurality of convex blocks for positioning the forming die and 2 lifting bolt holes, and the plurality of convex blocks are arranged close to the inner hole of the base; an oil groove is arranged on the top surface of the base, and the width of the oil groove is 4 mm.

according to the forming and quenching tool for the micro-disc-shaped external tooth friction plate, the sliding block is made of 20Cr2Ni4A alloy steel, the hardness of the sliding block is 43HRC, and the hardness of the working surface is more than or equal to 59 HRC; the inclined conical surface at the top of the sliding block is subjected to grinding treatment, the precision is higher than IT6 level, and the roughness is less than or equal to Ra0.8.

According to the micro-dish-shaped external tooth friction plate forming and quenching tool, the expansion ejector rod is made of medium carbon alloy steel, the hardness is 32HRC, the bottom conical surface is subjected to induction quenching, and the hardness of the bottom conical surface is more than or equal to 56 HRC; the conical surface at the bottom of the expansion ejector rod is subjected to grinding treatment, the precision is higher than IT6 level, and the roughness is less than or equal to Ra0.8.

a forming and quenching method for a micro-disc-shaped external tooth friction plate by using the forming and quenching tool for the micro-disc-shaped external tooth friction plate comprises the following processing steps:

1) Setting machine tool pressure quenching parameters;

2) Heating the friction plate in a mesh belt atmosphere furnace or a box-type atmosphere furnace, wherein the furnace loading mode is that the friction plate is horizontally placed in a single layer mode, and heating and heat preservation are carried out;

3) Taking out the friction plate in the red hot state and sleeving the friction plate into a core mold surrounded by a plurality of sliding blocks;

4) Starting the quenching machine tool, and automatically and accurately positioning the friction plate under the action of a core mold formed by enclosing the expansion ejector rod and the plurality of slide blocks; the friction plate is formed into a micro-disk shape and quenched under the action of the pressing die and the forming die;

5) And (4) after cooling, opening the press, taking the friction plate out of the core mold, tempering, and performing oxidation treatment after tempering.

In the forming quenching method of the micro-disc-shaped outer tooth friction plate, the specific parameters of the press quenching of the machine tool in the step 1) are as follows: the pressure applied to the expansion ejector rod is 2400lbs and is constant; applied to a die pressure of 3600lbs, a pulsation frequency of 40 HZ; keeping the pressure for 0.5 min; the oil flow was 606 l.min.

In the forming and quenching method of the micro-dish-shaped outer tooth friction plate, the heating temperature in the step 2) is 820-840 ℃, and the heat preservation time is about 10 min; the tempering temperature in step 5) is 540 ℃.

Compared with the prior art, the invention has the beneficial effects that:

1. The forming and quenching tool for the micro-dish-shaped external tooth friction plate is simple in structure and convenient to operate, 32 oil grooves I and 32 oil grooves II which are 4mm in diameter are respectively formed in the bottom surface of the pressing die and the top surface of the forming die which are matched with each other, and the positions of the oil grooves I and the oil grooves II are symmetrically staggered, so that the forming is not influenced on the basis of ensuring the quenching effect; the oil groove II on the forming die is not communicated, so that the quenching forming of the external teeth is facilitated, and the quenching hardness uniformity of the micro-disc-shaped external tooth friction plate is improved.

2. The forming die is of an annular structure, oil can flow out of an inner hole of the die, and a large amount of oil cannot be left after quenching; the material ejecting device can eject the friction plate, the friction plate cannot be directly contacted with residual oil on the die before quenching, local hardening or ignition before pressing can be avoided, and after quenching is finished, the material ejecting device can eject the friction plate, so that the material can be conveniently taken, and the surface of a product cannot be damaged;

3. the core mould is composed of a plurality of sliding blocks, so that loading and unloading are facilitated;

4. The base is provided with a plurality of oil grooves, and oil which flows into the inner hole of the core die from the forming die and the like can flow out of the base to form a smooth oil circulating system;

5. The sliding block and the outer surface of the expansion ejector rod are carburized, the hardness is more than or equal to 59HRC, the outer oblique conical surface of the expansion ejector rod is subjected to induction quenching, the hardness is more than or equal to 56HRC, the wear resistance is good, and the service life is long. The top oblique conical surface of the sliding block and the bottom conical surface of the expansion mandril are ground, the precision is less than or equal to IT6 level, the roughness is less than or equal to Ra0.8, and the influence of tool manufacturing errors on the shape correcting effect is eliminated; the forming precision of the micro-dish-shaped external tooth friction plate is ensured.

drawings

FIG. 1 is a schematic sectional structure view of a micro-disc-shaped outer tooth friction plate forming and quenching tool.

Fig. 2 is a schematic structural diagram of the material ejecting device of the invention.

FIG. 3 is a plan view of the forming die of the present invention.

FIG. 4 is a sectional view of the forming die of the invention.

Fig. 5 is a top view of the mandrel of the present invention.

Fig. 6 is a half sectional view schematically showing the structure of the core mold of the present invention.

Fig. 7 is a schematic view of the sliding bolt structure of the present invention.

Fig. 8 is a top view of the base of the present invention.

Fig. 9 is a cross-sectional view of a base of the present invention.

FIG. 10 is a schematic structural diagram of a micro-disk shaped outer tooth friction plate manufactured according to the present invention.

In fig. 1: 1. expanding the ejector rod; 2. pressing the die; 3. a forming die; 31. an oil sump; 4. ejecting the head; 5. a, a spring; 6. a connecting rod; 7. a base; 71. an oil sump; 72. bolt holes; 73. a raised block; 8. a slider; 9. a spring B; 10. and sliding the bolt.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in FIGS. 1-10, the forming and quenching tool for the micro-disc-shaped external tooth friction plate comprises an expansion ejector rod 1, a pressing die 2, a forming die 3, an ejector head 4, an ejector device, a base 7, a plurality of sliders 8, a spring B9 and a sliding bolt 10. Eight protruding blocks 73 and 2 hoisting bolt holes 72 for positioning the forming die are arranged on the top surface of the base 7, the eight protruding blocks 73 are arranged close to the inner hole of the base, and the oil liquid flow cannot be influenced when the forming die 3 is positioned. The 2 hoisting bolt holes 72 are matched with hoisting bolts, so that the core mold can be conveniently taken out from the quenching press. Be equipped with multichannel oil groove 71 on the base 7 top surface, oil groove 71 width is 4 mm. The forming die 3 is placed on the base 7 and positioned by eight projecting blocks 73. The pressing die 2 is pressed on the forming die 3, and the bottom surface of the pressing die 2 and the top surface of the forming die 3 are mutually matched conical surfaces; the bottom surface of moulding-die 2 is conical, and the cone angle is 179, has seted up 32 oil grooves I on moulding-die 2's the bottom surface, and I width in oil groove is 4mm, and oil groove I sets up along the direction of radius, link up whole moulding-die 2's lateral wall. The top surface of the forming die 3 is matched with the bottom surface of the pressing die 2, 32 oil grooves II 31 are arranged on the top surface of the forming die 3, the width of each oil groove II 31 is 4mm, each oil groove II 31 is arranged along the radius direction, each oil groove II 31 does not penetrate through the side wall of the forming die 3, and each oil groove II 31 and each oil groove I are staggered.

As shown in fig. 3 and 4, the side wall of the forming die 3 is provided with four through holes, and the four through holes are uniformly arranged along the circumferential direction. And a material ejecting device is arranged in each through hole. The liftout device include top 4, spring A5 and connecting rod 6, top 4 passes through spring A5 and connecting rod 6 and connects, top 4 sets up upwards. The diameter of the steel wire of the spring A5 is phi 1.2mm, the outer diameter of the steel wire is phi 9.2mm, the pitch is 2.6mm, and the rigidity is 8000N/m; the height of the ejector head 4 higher than the forming die 3 is 5mm, and the maximum elastic force generated by the four ejector devices in the quenching process is 160N.

The bottoms of the six sliding blocks 8 are arranged on the base 7 and are connected with the side wall of the base 7 through sliding bolts 10, sliding parts 101 in the middle of the sliding bolts 10 are arranged in bolt holes 74 in the side wall of the base 7, threaded ends 102 of the sliding bolts 10 are in threaded connection with the sliding blocks 8, springs B9 are sleeved on the sliding bolts 10, and the springs B9 are arranged between the sliding blocks 8 and the side wall of the base 7; six slide blocks 8 enclose a core mould, the top of which is a conical hole and the lower part is a circular stepped hole. The sliding block 8 is made of 20Cr2Ni4A alloy steel, the hardness of the sliding block 8 is 43HRC, and the hardness of the working surface is more than or equal to 59 HRC. The inclined conical surface at the top of the sliding block 8 is subjected to grinding treatment, the precision is higher than IT6 level, and the roughness is less than or equal to Ra0.8. The expansion ejector rod 1 is made of medium carbon alloy steel, the hardness is 32HRC, the bottom conical surface is subjected to induction quenching treatment, and the hardness of the bottom conical surface is more than or equal to 56 HRC. The expansion ejector rod 1 is positioned right above a concave die enclosed by a plurality of sliding blocks 8, and the bottom of the expansion ejector rod 1 is conical. The bottom conical surface of the expansion ejector rod 1 is ground, the precision is higher than IT6 level, and the roughness is less than or equal to Ra0.8.

The forming and quenching method of the micro-disc-shaped outer tooth friction plate comprises the following processing steps of:

1) Machine tool pressure quenching parameters are set before quenching, and the specific parameters of the machine tool pressure quenching are as follows: pressure 2400lbs (pounds) applied to the expansion ram 1, constant pressure; a pressure 3600lbs applied to the stamper 2, a pulsation frequency of 40 HZ; keeping the pressure for 0.5 min; the oil flow was 606 l.min.

2) Heating the friction plate in a mesh belt atmosphere furnace (or a box-type atmosphere furnace), wherein the charging mode is that the friction plate is horizontally placed in a single layer mode, the heating temperature is 820-840 ℃, and the heat preservation time is about 10 min;

3) taking out the friction plate in the red hot state and sleeving the friction plate into a core mold surrounded by six sliding blocks 8; the self weight of the friction plate is 0.437Kg (4.3N gravity), the compression amount of the liftout device is only 0.135mm, the distance from the forming die 3 is close to 5mm, and the friction plate cannot be contacted with residual oil on the die, so that the fire or local quenching is avoided;

4) Starting a quenching machine tool, and automatically and accurately positioning the friction plate under the action of the expansion ejector rod 1 and the core mold; the pressing die 2 and the forming die 3 act to enable the friction plate to form a micro-disk shape and quench;

5) And (4) after cooling, starting a press, taking the friction plate out of the core mould, tempering at about 540 ℃, and performing oxidation treatment after tempering.