Part pressure quenching tool

Abstract

The utility model relates to a heat treatment tool, and provides a part pressure quenching tool in order to solve the problem that in the prior art, parts are prone to deformation due to the fact that the parts are prone to being cooled unevenly in the pressure quenching process. The cooling device comprises an upper pressing ring, a supporting tool and a part to be cooled, the supporting tool is provided with a plurality of second through holes evenly distributed in a circle, the second through holes are obliquely formed, and the distance between the upper end face of each second through hole and a second supporting block is larger than the distance between the lower end face of each second through hole and the second supporting block; the second through hole is communicated with the first inner cavity between the base and the supporting tool; the upper pressing ring is provided with a plurality of third through holes communicating with the second through holes and a plurality of fourth through holes communicating with the third through holes, and the fourth through holes communicate with a second inner cavity defined by the upper pressing ring and the to-be-cooled part. And a plurality of fifth through holes which are uniformly distributed in a circle are formed in the upper pressing ring above the fourth through hole along the radial direction.

Description

Technical Field

[0001] The utility model relates to a heat treatment tool, in particular to a parts press quenching tool. Background Art

[0002] Quenching is a heat treatment process that heats the metal to above the critical temperature, keeps it at that temperature for a certain period of time, and then cools it at a rate greater than the critical cooling rate to obtain an unbalanced structure dominated by martensite. Press quenching is a process that applies pressure to the parts through the press quenching die during quenching to reduce the quenching deformation of the parts.

[0003] In the field of gear heat treatment, for large-sized, high-precision or easily deformed gear parts, a heat treatment process of carburizing and normalizing first and then secondary heating and shape quenching is adopted. When the parts are secondary heated and shape quenched, the press quenching die applies a certain pressure to the large and small end faces of the parts to reduce the deformation of the parts. In order to reduce the deformation of the splines in gear parts, the press quenching die also includes an expansion mandrel.

[0004] During press quenching, gear parts are mostly placed horizontally. Affected by the press machine structure and the mold structure, the quenching oil passes through the parts from bottom to top, causing the lower end face of the part to contact the quenching oil first, and the lower end face completes the martensitic transformation before the upper end face. Since the specific volume of martensite is greater than that of austenite, pearlite and other structures, the part warps toward the upper end face. Even during press quenching, the force of the outer pressure ring of the mold on the end face of the part is difficult to offset the force generated by the part during the structural transformation. Moreover, the thicker the part and the larger the end face, the more obvious this deformation trend is. During the process of limited form press quenching, the deformation caused by uneven cooling of the part is the main cause of part deformation.

[0005] Chinese patent CN207646249U discloses a press quenching cooling device, including an upper die and a lower die, the upper die adopts a double upper die mechanism, the upper die includes an upper outer die and an upper inner die, both of which are connected to the upper seat of the machine tool, the lower die is connected to the base of the machine tool, the workpiece is placed on the lower die, the oil baffle plate is connected to the oil collecting barrel, and the oil baffle plate is located between the upper outer die and the oil collecting barrel; it also includes a support rod connected to the hydraulic system, and the support rod is connected to the mandrel by screws. The press quenching cooling device is suitable for press quenching of gears with complex structures such as ribbed plates. During the press quenching process, the end face runout of the product is controlled by the clamping force of the upper and lower dies, the inner hole size stability is stabilized by the mandrel size, and the end face hardness uniformity is ensured by the oil channel cooling, so that the product has small deformation, stable size, and uniform hardness.

[0006] Chinese patent CN212504987U discloses a press-quenching die with internal splines and thin-walled structure, which is used for carburizing and limited-shape quenching of parts to be processed. It includes a pressure head and a mandrel assembly coaxially arranged with the pressure head, and also includes a pressure ring and a support member. The pressure ring is sleeved on the top end of the mandrel assembly, and the support member is sleeved on the bottom end of the mandrel assembly. The outside of the mandrel assembly, the pressure ring and the support member form a mounting position for the parts to be processed. The pressure ring and the support member act together on the internal spline surface and the external tooth surface of the part; the pressure ring includes a first pressure ring and a second pressure ring sleeved outside the first pressure ring, and the support member includes a first support ring and a second support ring, and the first support ring is sleeved on the mandrel assembly.

[0007] However, the common shortcomings of the above-mentioned prior arts are: uneven cooling of parts is prone to occur during press quenching, which can easily lead to deformation of parts, or the press quenching device has poor versatility and cannot meet the press quenching requirements of disc-shaped parts. Utility Model Content

[0008] The utility model aims to solve the problem in the prior art that uneven cooling of parts occurs during press quenching, which easily leads to deformation of parts, and the technical problem that the existing press quenching device has poor versatility, and to provide a part press quenching tool.

[0009] To achieve the above purpose, the technical solution provided by the utility model is:

[0010] A part press quenching tool, comprising a base, a cylindrical outer cover arranged on the outside of the base, a disc-shaped supporting tool arranged in the outer cover and located at the upper end of the base, a second supporting block arranged at the center of the supporting tool, a first supporting block arranged on the second supporting block, an expansion mandrel arranged on the first supporting block, a pressure head arranged on the expansion mandrel, an annular outer supporting ring coaxially arranged on the supporting tool, and an annular upper pressure ring arranged on the supporting tool and located above the outer supporting ring; the upper surface of the supporting tool is located between the outer supporting ring and the second supporting block and has at least six first through holes evenly distributed around the circumference, the part to be cooled is disc-shaped, its edge is clamped between the outer supporting ring and the upper pressure ring and its center is sleeved on the outside of the expansion mandrel; the bottom of the base is provided with a flow channel inlet for quenching oil to flow in; the second supporting block is provided with through holes evenly distributed around the circumference for quenching oil to flow through; its special features are:

[0011] The supporting tooling is also provided with a plurality of second through holes evenly distributed around, the second through holes are inclined, and the distance between the upper end face of the second through hole and the second supporting block is greater than the distance between the lower end face and the second supporting block; the second through hole is connected to the first inner cavity between the base and the supporting tooling; the upper pressure ring is provided with a plurality of third through holes respectively connected to the plurality of second through holes, and a plurality of fourth through holes respectively connected to the plurality of third through holes, the fourth through holes are connected to the second inner cavity surrounded by the upper pressure ring and the parts to be cooled; the upper pressure ring is provided with a plurality of fifth through holes evenly distributed around radially above the fourth through holes; the first through hole, the second through hole, the third through hole, the fourth through hole and the fifth through hole are all used for the flow of quenching oil.

[0012] Furthermore, the number of the first through holes is twenty-six, the included angle between the central axis of each first through hole and the central axis of the support tooling circle is 8°, and the distance between the upper end surface of the first through hole and the central axis of the support tooling circle is greater than the distance between the lower end surface and the central axis of the support tooling circle. The purpose of such a setting is to better control the flow rate of the quenching oil.

[0013] Furthermore, the number of the second through holes, the third through holes, and the fourth through holes are all twenty-four.

[0014] Furthermore, the number of the fifth through holes is fourteen.

[0015] Further, the third through hole is arranged in the axial direction, and the fourth through hole is arranged in the radial direction.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The parts press quenching tooling provided by the utility model is provided with a plurality of first through holes and a second through holes on the supporting tooling, and a plurality of third through holes, a fourth through hole and a fifth through hole are provided on the upper pressure ring. By changing the flow direction of the quenching oil, the cooling degree of the upper and lower end faces of the parts to be cooled during quenching is made more uniform, the deformation of the parts is reduced, and the yield rate of the parts is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of an embodiment of a press quenching tooling for parts of the utility model;

[0019] Figure 2 It is a structural schematic diagram of an embodiment of a press quenching tooling for parts of the utility model;

[0020] Figure 3 It is a structural schematic diagram of the upper pressure ring in the embodiment of the part press quenching tooling of the utility model;

[0021] Figure 4 This is a structural schematic diagram of a supporting tooling in an embodiment of a part press quenching tooling of the utility model;

[0022] Description of reference numerals:

[0023] 1-base; 2-outer cover; 3-pressure head; 4-expansion mandrel; 5-outer support ring; 6-support tooling, 61-first through hole, 62-second through hole; 7-upper pressure ring, 71-third through hole, 72-fourth through hole, 73-fifth through hole; 8-parts to be cooled; 9-first support block; 10-second support block. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] A part press quenching tool, see Figures 1 to 4 , comprising a base 1, a cylindrical outer cover 2 arranged on the outside of the base 1, a disc-shaped supporting fixture 6 arranged in the outer cover 2 and located at the upper end of the base 1, a second supporting block 10 arranged at the center of the supporting fixture 6, a first supporting block 9 arranged on the second supporting block 10, an expansion mandrel 4 arranged on the first supporting block 9, a pressure head 3 arranged on the expansion mandrel 4, an annular outer supporting ring 5 coaxially arranged on the supporting fixture 6, and an annular upper pressure ring 7 arranged on the supporting fixture 6 and located above the outer supporting ring 5; the upper surface of the supporting fixture 6 is located between the outer supporting ring 5 and the second supporting block 10 and is circumferentially evenly distributed with at least six first through holes 61, the part 8 to be cooled is disc-shaped, its edge is clamped between the outer supporting ring 5 and the upper pressure ring 7 and its center is sleeved on the outside of the expansion mandrel 4; the bottom of the base 1 is provided with a flow channel inlet for the quenching oil to flow in; the second supporting block 10 is provided with circumferentially evenly distributed through holes for the quenching oil to flow through;

[0026] The support fixture 6 is also provided with a plurality of second through holes 62 evenly distributed around a circle, the second through holes 62 are arranged obliquely, and the distance between the upper end surface of the second through hole 62 and the second support block 10 is greater than the distance between the lower end surface and the second support block 10; the second through hole 62 is connected to the first inner cavity between the base 1 and the support fixture 6;

[0027] The upper pressure ring 7 is provided with a plurality of third through holes 71 respectively connected with the plurality of second through holes 62, and a plurality of fourth through holes 72 respectively connected with the plurality of third through holes 71, and the fourth through holes 72 are connected with the second inner cavity surrounded by the upper pressure ring 7 and the part to be cooled 8; the upper pressure ring 7 is provided with a plurality of fifth through holes 73 evenly distributed around the circumference along the radial direction above the fourth through holes 72;

[0028] The second through hole 62, the third through hole 71 and the fourth through hole 72 are all used for the flow of quenching oil. In this embodiment, the number of the first through holes 61 is twenty-six, and the angle between the central axis of each first through hole 61 and the central axis of the support fixture 6 is 8°, and the distance between the upper end surface of the first through hole 61 and the central axis of the support fixture 6 is greater than the distance between the lower end surface and the central axis of the support fixture 6; the number of the second through holes 62, the third through holes 71, and the fourth through holes 72 is twenty-four; the number of the fifth through holes 73 is fourteen; the third through holes 71 are arranged along the axial direction, and the fourth through holes 72 are arranged along the radial direction.

[0029] In this embodiment, the quenching oil first enters from the flow channel inlet on the base 1, and then is divided into three paths, one path flows upward from the through hole of the middle second support block 10, another path flows through the second through hole 62, the third through hole 71 and the fourth through hole 72 in sequence, and finally merges into the second inner cavity surrounded by the upper pressure ring 7 and the part to be cooled 8, and another path flows through the first through hole 61. Finally, the three paths of quenching oil all flow into the second inner cavity surrounded by the upper pressure ring 7 and the part to be cooled 8, and then the quenching oil flows out through the fifth through hole 73, and then flows down along the inner wall of the outer cover 2. Such a flow direction can ensure uniform cooling of the part to be cooled 8. However, the flow direction of the quenching oil in the prior art cannot ensure uniform cooling of the part to be cooled 8, which is easy to cause deformation of the part to be cooled 8.

[0030] The method for using the above-mentioned part press quenching tooling comprises the following steps:

[0031] Step 1, assemble the parts press quenching tooling and load the parts to be cooled 8;

[0032] Step 2: according to actual needs, use bolts to seal a plurality of first through holes 61 to control the flow of quenching oil;

[0033] Step 3, adjusting the input flow of the quenching oil and the downward pressure of the upper pressure ring 7 on the part to be cooled 8, so that the height difference from the large end face to the small end face of the part to be cooled 8 after quenching is within the technical requirements;

[0034] Step 4: fix the process parameters of the part 8 to be cooled, and complete the use of the part press quenching tooling.

[0035] It should be noted that the above is only a specific implementation method of the present utility model, but the protection scope of the present utility model is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present utility model, and these modifications or substitutions should be included in the protection scope of the present utility model.

Claims

1. A part press quenching tool, comprising a base (1), a cylindrical outer cover (2) arranged outside the base (1), a disc-shaped supporting tool (6) arranged inside the outer cover (2) and located at the upper end of the base (1), a second supporting block (10) arranged at the center of the supporting tool (6), a first supporting block (9) arranged on the second supporting block (10), an expansion mandrel (4) arranged on the first supporting block (9), a pressure head (3) arranged on the expansion mandrel (4), an annular outer supporting ring (5) coaxially arranged on the supporting tool (6), and a pressure head (3) arranged on the supporting tool (6). 6) and an annular upper pressure ring (7) located above the outer support ring (5); the upper surface of the support fixture (6) is located between the outer support ring (5) and the second support block (10) and has at least six first through holes (61) evenly distributed around the circumference; the part to be cooled (8) is disc-shaped, its edge is clamped between the outer support ring (5) and the upper pressure ring (7) and its center is sleeved on the outside of the expansion mandrel (4); the bottom of the base (1) is provided with a flow channel inlet for the quenching oil to flow in; the second support block (10) is provided with through holes evenly distributed around the circumference for the quenching oil to flow through; it is characterized in that: The supporting fixture (6) is also provided with a plurality of second through holes (62) uniformly distributed around a circle, the second through holes (62) are arranged obliquely, and the distance between the upper end surface of the second through hole (62) and the second supporting block (10) is greater than the distance between the lower end surface and the second supporting block (10); the second through hole (62) is communicated with the first inner cavity between the base (1) and the supporting fixture (6); The upper pressure ring (7) is provided with a plurality of third through holes (71) respectively connected to the plurality of second through holes (62), and a plurality of fourth through holes (72) respectively connected to the plurality of third through holes (71), and the fourth through holes (72) are connected to a second inner cavity surrounded by the upper pressure ring (7) and the part to be cooled (8); The upper pressure ring (7) is provided with a plurality of fifth through holes (73) evenly distributed around a circle in a radial direction above the fourth through hole (72); The first through hole (61), the second through hole (62), the third through hole (71), the fourth through hole (72) and the fifth through hole (73) are all used for the flow of quenching oil.

2. The part press quenching tool according to claim 1, characterized in that: The number of the first through holes (61) is twenty-six, the included angle between the central axis of each first through hole (61) and the central axis of the support fixture (6) is 8°, and the distance between the upper end surface of the first through hole (61) and the central axis of the support fixture (6) is greater than the distance between the lower end surface and the central axis of the support fixture (6).

3. The part press quenching tool according to claim 1 or 2, characterized in that: The number of the second through holes (62), the third through holes (71), and the fourth through holes (72) are all twenty-four.

4. The part press quenching tool according to claim 3 is characterized in that: The number of the fifth through holes (73) is fourteen.

5. The part press quenching tool according to claim 4, characterized in that: The third through hole (71) is arranged along the axial direction, and the fourth through hole (72) is arranged along the radial direction.

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