CN113122687A - Fixed heat treatment pressure quenching die and using method thereof - Google Patents
Fixed heat treatment pressure quenching die and using method thereof Download PDFInfo
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- 238000010791 quenching Methods 0.000 title claims abstract description 113
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000010438 heat treatment Methods 0.000 title claims abstract description 19
- 230000006835 compression Effects 0.000 claims description 30
- 238000007906 compression Methods 0.000 claims description 30
- 238000003825 pressing Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 230000007704 transition Effects 0.000 claims description 4
- 238000012937 correction Methods 0.000 claims description 3
- 238000007669 thermal treatment Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims 1
- 239000007921 spray Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 238000005255 carburizing Methods 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
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- 239000007924 injection Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
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- 238000005496 tempering Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/673—Quenching devices for die quenching
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
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Abstract
The invention discloses a fixed heat treatment pressure quenching die and a using method thereof, wherein the die comprises a base, a mandrel, a fixing bolt, an inner support ring, an outer support ring, a single-head inner pressure ring and an outer pressure ring; when the gear part deformation limiting device is used, the deformation of the large-diameter end face of the gear part to be pressure-quenched is limited by the outer support ring and the outer support ring, the deformation of the small-diameter end face of the gear part to be pressure-quenched is limited by the inner pressure ring and the inner support ring, and the inner pressure ring and the inner support ring jointly guarantee that the height difference of the gear part to be pressure-quenched fluctuates within a reasonable range, so that the qualified rate of the gear part to be pressure-quenched is guaranteed.
Description
Technical Field
The invention relates to a pressure quenching die, in particular to a fixed heat treatment pressure quenching die and a using method thereof.
Background
The shape-limited quenching mainly comprises the processes of carburizing and normalizing, secondary heating, pressure quenching, low-temperature tempering and the like, and is mainly used for the carburizing heat treatment process of an easily-deformed part to prevent the part from being excessively deformed in the quenching process, wherein the pressure quenching process is the most important link of the shape-limited quenching, the design of a pressure quenching die, pressure quenching process parameters (pressure, pulse and time), a secondary heating process (secondary heating temperature and carbon potential), quenching oil parameters (oil product, oil temperature and flow) and the like all have important influence on the pressure quenching, and the design of the pressure quenching die is the most important ring of the pressure quenching process.
The pressure quenching die generally adopts an expansion type, for example: chinese patent, application number is: 201210517045.7 discloses a gear quenching device, in which the mandrel of the expanding press quenching die, in addition to the guiding function, also applies force to the internal spline or the internal tooth through the change of the outer diameter of the mandrel, and restrains the function of the small diameter size.
However, the conventional expansion type press quenching die cannot be used for the gear product shown in fig. 1 because: the gear in fig. 1 includes an inner cylinder 01, outer teeth 02, and a connecting portion 03 connecting the inner cylinder 01 and the outer teeth 02; the inner cylinder 01 is provided with inner teeth 04 and a multi-stage stepped hole 05 which is coaxial with the inner teeth 04 (a connection groove 07 is arranged between the inner teeth and the multi-stage stepped hole); the joint part of the inner cylinder 01 and the connecting part 03 is a conical surface 06; when the expanding die is adopted, the mandrel is difficult to act on the inner teeth 04, so that the mandrel cannot be used, and if the expanding die is redesigned for products of the type, the design and manufacturing cost is greatly increased, and the using effect is difficult to predict.
Disclosure of Invention
In order to solve the problem that the conventional expansion type pressure quenching die cannot be applied to a gear product with a special internal tooth structure, the invention provides a fixed type heat treatment pressure quenching die and a using method thereof by fully considering the structural characteristics, the material characteristics, the compatibility of pressure quenching equipment and the like of the product.
The specific technical scheme of the invention is as follows:
the fixed heat treatment pressure quenching die comprises a base, a mandrel, a fixing bolt, an inner support ring, an outer support ring, a single-head inner compression ring and an outer compression ring;
the mandrel is coaxially arranged in a multi-step hole which is coaxially arranged with the internal teeth in the gear part to be pressure-quenched and is fixedly connected with the base through a fixing bolt; the base is used for matching with the working table of the pressure quenching machine tool;
the inner support ring is coaxially sleeved outside the mandrel, the upper end face of the inner support ring is used for being in contact with the lower end face of an inner cylinder in the gear part to be pressure quenched, and the lower end face of the inner support ring is in contact with the base;
the outer support ring is coaxially sleeved outside the inner support ring, the upper end surface of the outer support ring is used for contacting with the lower end surface of an external tooth part in the gear part to be pressure quenched, and the lower end of the outer support ring is used for contacting with a working table surface of a pressure quenching machine tool;
the lower end face of the single-head internal pressure ring is provided with a first annular bulge which is used for being in contact with the upper end face of an inner cylinder in the gear part to be pressure-quenched, and the upper end face of the single-head internal pressure ring is used for being connected with an internal pressure head of a pressure-quenching machine tool;
the lower end face of the outer pressing ring is used for being in contact with the upper end face of the outer tooth part in the gear part to be pressed and quenched, and the upper end face of the outer pressing ring is used for being connected with an outer pressing head of a pressing and quenching machine tool.
Further, the die also comprises a double-head inner compression ring; the lower end surface of the double-end inner compression ring comprises a first annular bulge and a second annular bulge which are coaxially arranged; the first annular bulge is used for contacting with the upper end surface of the inner cylinder in the gear part to be pressure quenched; the second annular bulge is used for contacting with the bottom of a connecting groove between the internal teeth and the multistage stepped holes in the gear part to be pressure quenched.
Furthermore, a plurality of oil passing grooves are uniformly formed in the upper end face of the inner support ring, the upper end face of the outer support ring, the first annular bulge, the second annular bulge and the lower end face of the outer support ring along the circumferential direction.
Furthermore, the die also comprises a repair ring for repairing the gear part to be pressure quenched after pressure quenching; the lower end face of the repair ring comprises a third annular bulge and a fourth annular bulge which are coaxially arranged; the lower end surface of the third annular bulge is a conical surface and is used for contacting with a transition part connected with the inner cylinder and the connecting part; the fourth annular bulge is used for contacting with the bottom of a connecting groove between the internal teeth and the multistage stepped holes in the gear part to be pressure quenched.
Further, a plurality of oil passing grooves are uniformly formed in the third annular bulge and the fourth annular bulge of the die repairing ring along the circumferential direction.
Furthermore, an annular oil groove and an oil injection hole are formed in the die base; the annular oil groove is formed in the contact surface of the base, which is in contact with the working table surface of the pressure quenching machine tool; the nozzle opening is a plurality of, and along the circumferencial direction equipartition to with the perpendicular intercommunication of annular oil groove.
Based on the above description of the structure of the fixed heat treatment pressure quenching die, a method for using the die is introduced, and the specific using steps are as follows:
step 1: determining the type of the adopted internal compression ring;
if the hardenability of the gear part material to be pressure-quenched is in the middle lower limit, adopting a single-head internal pressure ring, and if the hardenability of the gear part material to be pressure-quenched is in the upper limit, adopting a double-head internal pressure ring;
step 2: assembly
Firstly, placing a base and an outer support ring on a working surface of a pressure quenching machine tool;
then, the inner support ring is placed on the base, and the mandrel is installed on the base through a fixing screw;
then, placing the gear part to be pressure quenched on the outer support ring and the inner support ring, and ensuring that the multistage stepped holes of the gear part to be pressure quenched are coaxially matched with the mandrel;
then, connecting the single-head inner pressure ring or the double-head inner pressure ring with an inner pressure head of a pressure quenching machine tool, and connecting the outer pressure ring with an outer pressure head of the pressure quenching machine tool;
and step 3: pressure quenching;
the pressure quenching machine tool starts to work to realize the pressure quenching work of the gear part to be pressure quenched;
and 4, step 4: examination of
Measuring whether the internal tooth span rod distance size of the part is qualified or not, and if so, finishing the pressure quenching work;
if the inner teeth are not qualified, the single-head inner compression ring or the double-head inner compression ring on the pressure quenching machine tool is removed, the repair ring is replaced, the rest parts of the die are unchanged, the pressure quenching machine tool is opened again for working, the third annular bulge of the repair ring applies pressure to the conical surface of the connection part of the inner cylinder and the connection part, and radial deformation correction of the inner teeth is achieved.
Further, the middle and lower limit of the hardenability of the gear part material to be pressure quenched is as follows: 40-44 HRC; the lower limit of the hardenability of the gear part material to be pressure quenched is as follows: 45-46 HRC.
The invention has the beneficial effects that:
1. the pressure quenching die comprises a base, a mandrel, a fixing bolt, an inner support ring, an outer support ring, a single-head inner compression ring (or a double-head inner compression ring) and an outer compression ring, is simple and practical in structure, and effectively solves the problems that an outer tooth part collapses and deforms and an outer tooth end face warps and an inner tooth part collapses and deforms and an inner tooth end face warps in the pressure quenching process of inner and outer tooth parts.
2. The invention adopts the single-head internal compression ring or the double-head internal compression ring to ensure the abnormal fluctuation of the height difference of the internal tooth part and the external tooth part in the pressure quenching process of parts with different hardenability.
3. The invention adopts the repair ring, realizes the repair when the internal tooth span length size is out of tolerance after the pressure quenching treatment, and further improves the qualification rate of the parts after the pressure quenching.
Drawings
FIG. 1 is a gear structure to be pressure quenched with internal and external teeth;
FIG. 2 is an assembly drawing of a press quenching die using a single-head inner compression ring and a gear part to be press quenched;
FIG. 3 is a schematic structural view of the mandrel;
FIG. 4 is a schematic structural view of a base;
FIG. 5 is a schematic structural view of the inner support ring;
FIG. 6 is a schematic structural view of an outer support ring;
FIG. 7 is a schematic view of a single-ended inner compression ring
FIG. 8 is a schematic structural view of an outer pressure ring;
fig. 9 is a schematic view of a repair ring.
FIG. 10 is an assembly view of a repair ring used to repair parts.
FIG. 11 is an assembly view of a press quenching die using a double-ended inner compression ring and a gear part to be press quenched;
fig. 12 is a schematic structural view of the double-ended inner compression ring.
The reference numbers are as follows:
01-inner cylinder, 02-outer tooth part 02, 03-connecting part, 04-inner tooth, 05-multi-stage step hole, 06-conical surface and 07-connecting groove;
1-base, 2-mandrel, 3-fixing bolt, 4-inner supporting ring, 5-outer supporting ring, 6-single-head inner pressing ring, 7-outer pressing ring, 8-gear part to be pressed and quenched, 9-annular oil groove, 10-oil spray hole, 11-first annular bulge, 12-repair ring, 13-third annular bulge, 14-fourth annular bulge, 15-oil groove, 16-double-head inner pressing ring and 17-second annular bulge.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.
Fig. 1 shows a gear structure with internal and external teeth having a special shape, which includes an inner cylinder 01, an external tooth 02, and a connecting portion 03 connecting the inner cylinder 01 and the external tooth 02; the inner cylinder 01 is provided with inner teeth 04 and a multi-stage stepped hole 05 which is coaxial with the inner teeth 04 (a connection groove 07 is arranged between the inner teeth and the multi-stage stepped hole); the joint part of the inner cylinder 01 and the connecting part 03 is a conical surface 06; due to the special structure of the product, the over-difference of the span spherical distance of the internal teeth and the over-difference of the height difference of the upper end surface and the lower end surface (small diameter end surface) of the internal cylinder and the upper end surface and the lower end surface (large diameter end surface) of the external tooth part are easy to occur. Theoretical analysis and initial production test show that the internal tooth span spherical distance out-of-tolerance is mainly caused by radial expansion of internal teeth and integral warping of parts, and the internal teeth play a main role; the height difference out-of-tolerance between the large-diameter end face and the small-diameter end face is the warping caused by the overlarge stress due to the cooling of the lower end of the part in the pressure quenching process.
Based on the analysis, the invention provides a fixed heat treatment pressure quenching die, which is basically realized according to the following principle: the deformation of the large-diameter end face is limited by the outer pressure ring and the outer support ring respectively, and the deformation of the small-diameter end face is limited by the inner pressure ring and the inner support ring respectively; the two ensure that the height difference of the product fluctuates within a reasonable range.
The invention provides two different pressure quenching dies according to the hardenability of the gear part material to be pressure quenched. The two pressure quenching dies are different in the inner pressure ring (divided into a single-head inner pressure ring and a double-head inner pressure ring).
Example 1
As shown in fig. 2, a fixed thermal treatment pressure quenching die comprises a base 1, a mandrel 2, a fixing bolt 3, an inner support ring 4, an outer support ring 5, a single-head inner compression ring 6 and an outer compression ring 7;
as shown in fig. 2 and 3, the mandrel 2 is coaxially installed in a multistage step hole which is coaxially arranged with the internal teeth in the gear part 8 to be pressure-quenched, and the mandrel 2 is fixedly connected with the base 1 through a fixing bolt 3; the mandrel 2 mainly plays a role in positioning and oil guiding, and prevents the gear part 8 to be pressure quenched from inclining, shaking and the like in the quenching process; the part of the mandrel 1 matched with the gear part 8 to be pressure-quenched needs to be removed with sharp corners, and a fillet with a certain radian is reserved in the embodiment, so that the gear part 8 to be pressure-quenched in a thermal state is prevented from interfering with the sharp corners of the mandrel 2 when being placed, and the gear part to be pressure-quenched is prevented from colliding;
as shown in fig. 2 and 4, the base 1 is used for matching with a working table of a pressure quenching machine tool; the base 1 is provided with an annular oil groove 9 and an oil spray hole 10; the annular oil groove 9 is formed in the contact surface of the base 1, which is in contact with the working table surface of the pressure quenching machine tool; the oil spray holes 10 are uniformly distributed along the circumferential direction and are vertically communicated with the annular groove 9. Quenching oil is sprayed out from the bottom end of the oil groove of the pressure quenching machine along the oil inlet hole and is used for quenching the gear part to be pressure quenched, and the annular oil groove aims to prevent an oil path from being blocked;
as shown in fig. 2 and 5, the inner support ring 4 is coaxially sleeved outside the mandrel 2, the upper end surface of the inner support ring 4 is used for contacting with the lower end surface of the inner cylinder in the gear part to be pressure quenched, and the lower end surface of the inner support ring 4 contacts with the base 1;
as shown in fig. 2 and 6, the outer support ring 5 is coaxially sleeved outside the inner support ring 4, the upper end surface of the outer support ring 5 is used for contacting with the lower end surface of the external tooth part in the gear part 8 to be pressure quenched, and the lower end of the outer support ring 5 is used for contacting with the working table of the pressure quenching machine tool;
as shown in fig. 2 and 7, the lower end surface of the single-head inner compression ring 6 is provided with a first annular protrusion 11 for contacting with the upper end surface of the inner cylinder in the gear part 8 to be pressure quenched, and the upper end surface of the single-head inner compression ring 6 is used for connecting with an inner pressure head of a pressure quenching machine tool; as shown in fig. 2 and 8, the lower end surface of the outer ring 7 is used for contacting with the upper end surface of the external tooth part in the gear part 8 to be pressure quenched, and the upper end surface of the outer ring 7 is used for connecting with an outer head of a pressure quenching machine tool.
Through data statistics, about 5% of the size of the internal tooth span length of the part is out of tolerance (mainly out of tolerance), and in order to repair the internal tooth span length after pressure quenching when the size of the internal tooth span length is out of tolerance, the pressure quenching die further comprises a repair ring 12 for repairing the gear part to be pressure quenched after pressure quenching; in use, the one-piece inner compression ring 6 is replaced with a repair ring 12, as shown in fig. 9 and 10, and the lower end surface of the repair ring 12 includes a third annular projection 13 and a fourth annular projection 14 which are coaxially arranged; the lower end surface of the third annular bulge 13 is a conical surface and is used for contacting with a transition part of the inner cylinder connected with the connecting part; the fourth annular bulge 14 is used for contacting with the bottom of the connecting groove between the internal teeth and the multistage stepped holes in the gear part 8 to be pressed and quenched.
In order to ensure smooth oil passing and uniform stress of each part of the gear part to be pressure-quenched, in this embodiment, the upper end surface of the inner support ring 4, the upper end surface of the outer support ring 5, the first annular protrusion 11, the third annular protrusion 13, the fourth annular protrusion 14 and the lower end surface of the outer support ring 7 are uniformly provided with a plurality of oil passing grooves 15 along the circumferential direction.
The process of implementing the specific work by adopting the pressure quenching of the embodiment is as follows:
step 1: determining the type of the adopted internal compression ring;
if the hardenability of the gear part 8 to be pressure-quenched is in a middle-lower limit (the value range of the middle-lower limit of the hardenability is 40-44HRC), adopting a single-head internal pressure ring 6, and when the hardenability of the gear part 8 to be pressure-quenched is in an upper limit (the value range of the upper limit of the hardenability is 45-46HRC), adopting a double-head internal pressure ring; in the embodiment, the hardenability of the gear part 8 to be pressure-quenched is 41HRC, so that the single-head internal pressure ring 6 is selected;
step 2: assembly
Firstly, a base 1 and an outer support ring 5 are placed on a working surface of a pressure quenching machine tool;
then, the inner support ring 4 is placed on the base, and the mandrel 2 is installed on the base 1 through the fixing screw 3;
then, placing the gear part 8 to be pressure quenched on the outer support ring 5 and the inner support ring 4, and ensuring that the multistage stepped holes of the gear part 8 to be pressure quenched are coaxially matched with the mandrel 2;
then, connecting the single-end inner pressure ring 6 with an inner pressure head of a pressure quenching machine tool, and connecting the outer pressure ring 7 with an outer pressure head of the pressure quenching machine tool;
and step 3: pressure quenching;
the pressure quenching machine tool starts to work to realize the pressure quenching work of the gear part to be pressure quenched; when the device works, the outer support ring is used for supporting the lower end face of the external tooth part to prevent the external tooth part from collapsing and deforming; the outer ring is used for transmitting the pressure of an outer pressure head of the pressure quenching machine tool and preventing the end face of the external tooth part from buckling and deforming; the inner support ring is used for supporting the lower end face of the inner tooth part and preventing the inner tooth part from collapsing and deforming; the internal pressure ring is used for transmitting the pressure of an internal pressure head of the pressure quenching machine tool and preventing the buckling deformation of the internal tooth part; to collectively limit irregular distortion within the part;
and 4, step 4: examination of
Measuring whether the internal tooth span rod distance size of the part is qualified or not, and if so, finishing the pressure quenching work;
if the inner tooth deformation is not qualified, the single-end inner compression ring 6 on the pressure quenching machine tool is removed, the upper repair ring 11 is replaced, the rest part of the die is unchanged, the pressure quenching machine tool is started again to work, and the third annular bulge 13 of the repair ring exerts pressure on the conical surface of the connection part of the inner cylinder and the connection part, so that the radial deformation correction of the inner teeth is realized.
Example 2
As shown in fig. 11, a fixed thermal treatment pressure quenching die comprises a base 1, a mandrel 2, a fixing bolt 3, an inner support ring 4, an outer support ring 5, a double-headed inner pressure ring 16 and an outer pressure ring 7;
as shown in fig. 3 and 11, the mandrel 2 is coaxially installed in a multistage step hole coaxially arranged with the internal teeth in the gear part 8 to be pressure-quenched, and the mandrel 2 is fixedly connected with the base 1 through a fixing bolt 3; the mandrel 2 mainly plays a role in positioning and oil guiding, and prevents the gear part 8 to be pressure quenched from inclining, shaking and the like in the quenching process; the part of the mandrel 1 matched with the gear part 8 to be pressure-quenched needs to be removed with sharp corners, and a fillet with a certain radian is reserved in the embodiment, so that the gear part 8 to be pressure-quenched in a thermal state is prevented from interfering with the sharp corners of the mandrel 2 when being placed, and the gear part to be pressure-quenched is prevented from colliding;
as shown in fig. 4 and 11, the base 1 is used for matching with a working table of a pressure quenching machine tool; the base 1 is provided with an annular oil groove 9 and an oil spray hole 10; the annular oil groove 9 is formed in the contact surface of the base 1, which is in contact with the working table surface of the pressure quenching machine tool; the oil spray holes 10 are uniformly distributed along the circumferential direction and are vertically communicated with the annular groove 9. Quenching oil is sprayed out from the bottom end of the oil groove of the pressure quenching machine along the oil inlet hole and is used for quenching the gear part to be pressure quenched, and the annular oil groove aims to prevent an oil path from being blocked;
as shown in fig. 5 and fig. 11, the inner support ring 4 is coaxially sleeved outside the mandrel 2, the upper end surface of the inner support ring 4 is used for contacting with the lower end surface of the inner cylinder in the gear part to be pressure quenched, and the lower end surface of the inner support ring 4 contacts with the base 1;
as shown in fig. 6 and 11, the outer support ring 5 is coaxially sleeved outside the inner support ring 4, the upper end surface of the outer support ring 5 is used for contacting with the lower end surface of the external tooth part in the gear part 8 to be pressure quenched, and the lower end of the outer support ring 5 is used for contacting with the working table of the pressure quenching machine tool;
as shown in fig. 11 and 12, the lower end face of the double-ended inner compression ring 16 includes a first annular projection 11 and a second annular projection 17 which are coaxially arranged; the first annular bulge 11 is used for contacting with the upper end surface of an inner cylinder in the gear part to be pressure quenched; the second annular bulge 17 is used for contacting the bottom of a connecting groove between the internal teeth and the multistage stepped holes in the gear part to be pressure quenched;
as shown in fig. 8 and 11, the lower end surface of the outer ring 7 is used for contacting with the upper end surface of the external tooth part in the gear part to be pressure quenched 8, and the upper end surface of the outer ring 7 is used for connecting with the outer head of the pressure quenching machine tool.
In order to repair the internal tooth span rod size after pressure quenching when the size is out of tolerance, the pressure quenching die of the embodiment further comprises a repair ring 12 for repairing the gear part to be pressure quenched after pressure quenching; in use, the double-ended inner compression ring is replaced with a repair ring 12, as shown in fig. 9 and 10, the lower end face of the repair ring 12 includes a third annular projection 13 and a fourth annular projection 14 which are coaxially arranged; the lower end surface of the third annular bulge 13 is a conical surface and is used for contacting with a transition part of the inner cylinder connected with the connecting part; the fourth annular bulge 14 is used for contacting with the bottom of the connecting groove between the internal teeth and the multistage stepped holes in the gear part to be pressed and quenched.
In order to ensure smooth oil passing and uniform stress of each part of the gear part to be pressure-quenched, in this embodiment, the upper end surface of the inner support ring 4, the upper end surface of the outer support ring 5, the first annular protrusion 11, the third annular protrusion 13, the fourth annular protrusion 14 and the lower end surface of the outer support ring 7 are uniformly provided with a plurality of oil passing grooves 15 along the circumferential direction.
The specific process of this embodiment is substantially the same as that of embodiment 1, and is not described herein again.
Claims (8)
1. A fixed thermal treatment pressure quenching die is characterized in that:
the device comprises a base, a mandrel, a fixing bolt, an inner supporting ring, an outer supporting ring, a single-head inner pressure ring and an outer pressure ring;
the mandrel is coaxially arranged in a multi-step hole which is coaxially arranged with the internal teeth in the gear part to be pressure-quenched and is fixedly connected with the base through a fixing bolt; the base is used for matching with the working table of the pressure quenching machine tool;
the inner support ring is coaxially sleeved outside the mandrel, the upper end face of the inner support ring is used for being in contact with the lower end face of an inner cylinder in the gear part to be pressure quenched, and the lower end face of the inner support ring is in contact with the base;
the outer support ring is coaxially sleeved outside the inner support ring, the upper end surface of the outer support ring is used for contacting with the lower end surface of an external tooth part in the gear part to be pressure quenched, and the lower end of the outer support ring is used for contacting with a working table surface of a pressure quenching machine tool;
the lower end face of the single-head internal pressure ring is provided with a first annular bulge which is used for being in contact with the upper end face of an inner cylinder in the gear part to be pressure-quenched, and the upper end face of the single-head internal pressure ring is used for being connected with an internal pressure head of a pressure-quenching machine tool;
the lower end face of the outer pressing ring is used for being in contact with the upper end face of the outer tooth part in the gear part to be pressed and quenched, and the upper end face of the outer pressing ring is used for being connected with an outer pressing head of a pressing and quenching machine tool.
2. The stationary heat treatment press quenching die of claim 1, wherein: the double-head inner compression ring is also included; the lower end surface of the double-end inner compression ring comprises a first annular bulge and a second annular bulge which are coaxially arranged; the first annular bulge is used for contacting with the upper end surface of the inner cylinder in the gear part to be pressure quenched; the second annular bulge is used for contacting with the bottom of a connecting groove between the internal teeth and the multistage stepped holes in the gear part to be pressure quenched.
3. The stationary heat treatment press quenching die of claim 2, wherein: and a plurality of oil passing grooves are uniformly formed in the upper end surface of the inner support ring, the upper end surface of the outer support ring, the first annular bulge, the second annular bulge and the lower end surface of the outer support ring along the circumferential direction.
4. The stationary heat treatment press quenching die of claim 3, wherein: the gear part repairing device further comprises a repairing ring for repairing the gear part to be pressure quenched after pressure quenching; the lower end face of the repair ring comprises a third annular bulge and a fourth annular bulge which are coaxially arranged; the lower end surface of the third annular bulge is a conical surface and is used for contacting with a transition part connected with the inner cylinder and the connecting part; the fourth annular bulge is used for contacting with the bottom of a connecting groove between the internal teeth and the multistage stepped holes in the gear part to be pressure quenched.
5. The stationary heat treatment press quenching die of claim 3, wherein: the third annular bulge and the fourth annular bulge of the repair ring are evenly provided with a plurality of oil passing grooves along the circumferential direction.
6. The stationary heat treatment press quenching die of claim 3, wherein: the base is provided with an annular oil groove and an oil spraying hole;
the annular oil groove is formed in the contact surface of the base, which is in contact with the working table surface of the pressure quenching machine tool;
the nozzle opening is a plurality of, and along the circumferencial direction equipartition to with the perpendicular intercommunication of annular oil groove.
7. The use method of the fixed heat treatment pressure quenching die is characterized in that the pressure quenching die adopts the pressure quenching die as claimed in claim 6, and the specific use steps are as follows:
step 1: determining the type of the adopted internal compression ring;
if the hardenability of the gear part material to be pressure-quenched is in the middle lower limit, adopting a single-head internal pressure ring, and if the hardenability of the gear part material to be pressure-quenched is in the upper limit, adopting a double-head internal pressure ring;
step 2: assembly
Firstly, placing a base and an outer support ring on a working surface of a pressure quenching machine tool;
then, the inner support ring is placed on the base, and the mandrel is installed on the base through a fixing screw;
then, placing the gear part to be pressure quenched on the outer support ring and the inner support ring, and ensuring that the multistage stepped holes of the gear part to be pressure quenched are coaxially matched with the mandrel;
then, connecting the single-head inner pressure ring or the double-head inner pressure ring with an inner pressure head of a pressure quenching machine tool, and connecting the outer pressure ring with an outer pressure head of the pressure quenching machine tool;
and step 3: pressure quenching;
the pressure quenching machine tool starts to work to realize the pressure quenching work of the gear part to be pressure quenched;
and 4, step 4: examination of
Measuring whether the internal tooth span rod distance size of the part is qualified or not, and if so, finishing the pressure quenching work;
if the inner teeth are not qualified, the single-head inner compression ring or the double-head inner compression ring on the pressure quenching machine tool is removed, the repair ring is replaced, the rest parts of the die are unchanged, the pressure quenching machine tool is opened again for working, the third annular bulge of the repair ring applies pressure to the conical surface of the connection part of the inner cylinder and the connection part, and radial deformation correction of the inner teeth is achieved.
8. The use method of the fixed heat treatment pressure quenching die as claimed in claim 7, wherein: the lower limit of the hardenability of the gear part material to be pressure quenched is as follows: 40-44 HRC; the lower limit of the hardenability of the gear part material to be pressure quenched is as follows: 45-46 HRC.
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| CN202110309416.1A CN113122687A (en) | 2021-03-23 | 2021-03-23 | Fixed heat treatment pressure quenching die and using method thereof |
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| CN202110309416.1A CN113122687A (en) | 2021-03-23 | 2021-03-23 | Fixed heat treatment pressure quenching die and using method thereof |
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| CN113801982A (en) * | 2021-09-03 | 2021-12-17 | 江麓机电集团有限公司 | Pressure quenching die and process for large-diameter thin-arc plate carburized gear |
| CN113957213A (en) * | 2021-09-08 | 2022-01-21 | 李宝杰 | Quenching tool |
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Application publication date: 20210716 |