Heat-resistant tool for heat treatment of duplicate gear shaft

Abstract

The utility model aims to solve the problems of complex process, high cost and unstable distortion control effect in the heat treatment process of a gear shaft in the prior art, and provides a heat-resistant tool for heat treatment of a duplicate gear shaft. The two partition plates are arranged on the upper end wall and the lower end wall of the rectangular frame in a central symmetry mode respectively, and the two partition plates are fixedly connected through a connecting plate and are parallel to the long side wall of the rectangular frame. One group of fixing plates is vertically connected between one partition plate and one longer side wall of the rectangular frame, and the other group of fixing plates is vertically connected between the other partition plate and the other longer side wall of the rectangular frame; a gap is formed between the two fixing plates included in each group of fixing plates, a first arc-shaped clamping groove is formed in the upper edge of one longer side wall of the rectangular frame located between the gaps, and a second arc-shaped clamping groove corresponding to the first arc-shaped clamping groove is formed in the upper edge of the other longer side wall of the rectangular frame located between the gaps; supporting structures are arranged at the two ends of the two long side walls in the rectangular frame.

Description

TECHNICAL FIELD

[0001] The utility model relates to a special tool, concretely relates to a kind of heat-resistant tool for duplex gear shaft heat treatment. BACKGROUND

[0002] The duplex gear shaft structure design in gearbox has the advantages of saving space, high transmission efficiency, high rigidity, simple assembly process, optimized power transmission and low total cost during the service of the part, therefore, the application of such integrated duplex gear shaft structure part is more and more. But the biggest challenge brought by this structure design is the higher requirement for process manufacturing level, especially for the distortion control during the overall heat treatment process of the part, the gear distortion under the conventional heat treatment process is large, which leads to the easy occurrence of black skin or / and eccentric grinding during the subsequent grinding process, so that the precision measurement report often cannot meet the design requirements. For this, the prior art mainly optimizes from the aspects of material, structure design, process and special tool.

[0003] Figure 1 As shown in a duplex gear shaft part used on a commonly used gearbox, when heat treatment is carried out, if hanging or vertical flat is adopted, due to the thin right side gear web plate of duplex gear shaft, under the joint action of self-gravity and organizational stress during heat treatment process, it will lead to large right side gear end face runout, and further cause large cumulative error of right side gear, which will cause black skin or / and eccentric grinding during subsequent grinding process, and finally cause the problem of unqualified scrap or premature failure of the part during service, thereby increasing production cost.

[0004] Chinese patent CN115354136A discloses a heat treatment method for controlling gear carburizing and quenching distortion, which adopts a comprehensive heat treatment scheme of ① pre-oxidation + phase transition point uniformization, ② vertical clamping carburizing, ③ rotating 90 degrees quenching + high-temperature oil + static oil quenching, to realize effective control of gear carburizing and quenching distortion by controlling organizational deformation and thermal stress deformation. Chinese patent CN118893431A discloses a duplex gear heat treatment and mechanical processing micro-deformation control process method, which optimizes process parameters through process flow design to actively release the internal stress of the gear, and adopts special composite quenching tool for pressure quenching on a pressure quenching machine after carburizing and quenching to ensure that the flatness and runout of the gear after quenching are within the design range.

[0005] But the above two technical solutions are to control distortion by optimizing process flow, which needs multi-process coordination, not only difficult, but also needs to purchase special equipment or modify existing equipment to meet the requirements of optimized process, and professional technical personnel are also needed to perform complex operation and monitoring, which increases labor cost, and the above two technical solutions are not suitable for small and medium-sized enterprises. Figure 1The double gear shaft part in the double gear shaft is heat treated by the heat treatment tool, and the heat treatment process is optimized, so that the heat treatment process is simplified, the cost is reduced, and the distortion control effect is stable. Content of the utility model

[0006] The utility model discloses a heat treatment tool for double gear shafts, which solves the problems of complex process, high cost and unstable distortion control effect in the heat treatment process of gear shafts in the prior art.

[0007] The technical scheme of the utility model is as follows:

[0008] A heat treatment tool for double gear shafts, characterized in that:

[0009] The heat treatment tool comprises a rectangular frame, partitions, connecting plates, fixed plates and a support structure.

[0010] The two partitions are centrally symmetrically arranged in the rectangular frame, one end of each partition is connected to a shorter side wall of the rectangular frame, and the two partitions are parallel to the longer side walls of the rectangular frame.

[0011] Each group of fixed plates comprises two fixed plates, one group of fixed plates is vertically connected between one partition and a longer side wall of the rectangular frame, and the other group of fixed plates is vertically connected between the other partition and the other longer side wall of the rectangular frame.

[0012] The height of the partitions is lower than or equal to the height of the longer side walls of the rectangular frame, and the height of the fixed plates is lower than the height of the longer side walls of the rectangular frame.

[0013] The two fixed plates in each group of fixed plates are spaced apart, and a first circular-arc-shaped clamping groove is arranged on the longer side wall of the rectangular frame between the two fixed plates.

[0014] The support structure is arranged at the lower edge of the longer side walls of the rectangular frame, and is used for limiting and installing the rectangular frame.

[0015] Further, in order to match the right gear and pinion of the double gear shaft, the distance between each partition and the longer side wall connected with one side of the fixed plate is greater than the distance between the partition and the other longer side wall.

[0016] Furthermore, since the shaft diameter of the left side of the double gear shaft is larger than that of the right side, the radius of the arc of the first arc-shaped slot is larger than that of the second arc-shaped slot.

[0017] Furthermore, in order to ensure that the shafts of the double gear shafts are located on the same horizontal plane, according to the size of the double gear shafts, support blocks for supporting the double gear shafts are provided on the upper edge of the partitions located between the intervals of each set of fixed plates.

[0018] Furthermore, the support structure includes two positioning grooves and two mounting plates. The two longer sidewalls of the rectangular frame extend to the outside of the shorter sidewalls at both ends, and the two positioning grooves are respectively provided at the lower edge of the same end of the two longer sidewalls, and the two mounting plates are respectively provided at the other end.

[0019] Furthermore, a first arc-shaped groove is provided along the lower edge of the longer sidewall of the rectangular frame located between the intervals of each group of fixed plates, and a second arc-shaped groove corresponding to the first arc-shaped groove is provided along the lower edge of the other longer sidewall of the rectangular frame; a support block for supporting the double gear shaft is provided along the lower edge of the partition between the intervals of each group of fixed plates; the support structure also includes two additional positioning grooves, which are respectively provided along the upper edge of one end of the two longer sidewalls, so that the heat-resistant tooling can be used in both directions.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) This utility model designs a rectangular frame and the spatial relationship between each set of fixed plates and partitions. It uses the first and second arc-shaped slots on the upper edge of the two longer side walls of the rectangular frame to limit the double gear shaft parts. The rectangular frame is then hung on the heat-resistant steel of the flower stand using the positioning slot and the mounting plate. This achieves the horizontal suspension of the double gear shaft parts, effectively optimizing the problem of large end face runout and cumulative error of the right gear in the double gear shaft parts. It also prevents the occurrence of black skin or / and uneven grinding in the subsequent gear grinding process, and improves the stability of product production and the consistency of gear grinding.

[0022] (2) Through the reasonable space design inside the rectangular frame, the double gear shaft part is limited and supported by the first arc-shaped slot, the second arc-shaped slot and the support block, so that the double gear shaft part can be kept horizontally suspended. Since the total weight of the double gear shaft part is relatively light compared with the shaft diameter, the placement method of the present invention will not cause the part to bend due to the large shaft body. The other risks of the placement method of the present invention are controllable.

[0023] (3) The utility model discloses a reasonable space design in rectangular frame inside, two double gear shaft parts can be placed in dislocation when preparing material, improve the space utilization, compare prior art, the utility model discloses in one heat treatment process, can simultaneously to more double gear shaft parts processing, further improve the work efficiency, reduce production cost. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a kind of double gear shaft parts of structure schematic diagram of commonly used gearbox;Wherein, (a) is the cross section of double gear shaft parts, (b) is the stereoscopic structure diagram of double gear shaft parts;

[0025] Figure 2 It is the stereoscopic structure schematic diagram of the utility model a kind of double gear shaft heat treatment with heat-resistant tooling embodiment;

[0026] Figure 3 It is the application state schematic diagram of the utility model embodiment when double gear shaft heat treatment.

[0027] In the drawing: 1-rectangular frame, 2-baffle, 3-connection plate, 4-fixed plate, 5-first circular arc slot, 6-second circular arc slot, 7-positioning slot, 8-bridge plate, 9-supporting block. DETAILED DESCRIPTION

[0028] The utility model will be further explained in detail in combination with specific embodiment, and it is explained that the utility model is not limited to the explanation.

[0029] Refer to attached Figure 2 From improving, such as Figure 1Based on the angle of runout of the right gear in a double gear shaft component, this embodiment provides a heat-resistant fixture for heat treatment of a double gear shaft, including a rectangular frame 1, two partitions 2, a connecting plate 3, and four fixing plates 4. The two partitions 2 are centrally symmetrically arranged within the rectangular frame 1, with one end of each partition 2 connected to the two shorter sidewalls of the rectangular frame 1, and the two partitions 2 are parallel to the two longer sidewalls of the rectangular frame 1. The two partitions 2 are fixedly connected by the connecting plate 3, dividing the rectangular frame 1 into two centrally symmetrical parts. The four fixing plates 4 are divided into two groups: one group is vertically connected between the partition 2 and one of the longer sidewalls of the rectangular frame 1, and the other group is vertically connected between the partition 2 and the other longer sidewall of the rectangular frame 1. The height of plate 2 is equal to the height of the two longer sidewalls in the rectangular frame 1, and the height of fixed plate 4 is lower than the height of the two longer sidewalls in the rectangular frame 1; the distance between each partition 2 and the longer sidewall connected to the fixed plate 4 is greater than the distance between the partition 2 and the other longer sidewall, and there is a gap between the two fixed plates 4 in each group; a first arc-shaped slot 5 is provided on the upper edge of the longer sidewall in the rectangular frame 1 located between the gaps, and a second arc-shaped slot 6 corresponding to the first arc-shaped slot 5 is provided on the upper edge of the other longer sidewall in the rectangular frame 1; the two ends of the sidewalls of the rectangular frame 1 extend to the outside of the end wall, and two positioning slots 7 are respectively provided on the lower edge of the same end of the two longer sidewalls, and two mounting plates 8 are respectively provided on the other end.

[0030] As attached Figure 3 As shown, during material preparation, the space formed by the rectangular frame 1, partition 2, and a set of fixed plates 4 of this heat-resistant tooling is used to accommodate materials such as... Figure 1 The small gear of the double gear shaft component, and correspondingly, the space on the other side of the partition 2 is used to accommodate such as Figure 1 To better achieve the desired placement effect for the right gear on the double gear shaft component, the inner diameter of the first arc-shaped groove 5 is larger than the inner diameter of the second arc-shaped groove 6. The first arc-shaped groove 5 and the second arc-shaped groove 6 are respectively used to place... Figure 1 The left and right shafts of the intermediate gear shaft limit the double gear shaft parts. In order to ensure that the shaft body of the double gear shaft parts is located on the same horizontal plane, according to the size of the double gear shaft, the upper edge of the partition plate 2 located between the intervals of each set of fixed plates 4 is provided with support blocks 9 for supporting the double gear shaft, so that the three support points on the left, right and left and right sides of the shaft body of the double gear shaft parts are in contact with the tooling.

[0031] For ease of use, a first arc-shaped slot 5 is provided on the lower edge of the longer side wall of the rectangular frame 1 located between the intervals of each set of fixing plates 4, and a second arc-shaped slot 6 corresponding to the first arc-shaped slot 5 is provided on the lower edge of the other longer side wall of the rectangular frame 1; a support block 9 for supporting the double gear shaft is provided on the lower edge of the partition plate 2 located between the intervals of each set of fixing plates 4; the support structure also includes two additional positioning slots 7, which are respectively provided on the upper edge of one end of the two longer side walls, so that this heat-resistant tooling can be used on both sides when preparing materials.

[0032] The usage process is as follows:

[0033] (1) One end of the rectangular frame 1 is attached to a support rod of the heat-resistant steel of the assembled flower stand through the positioning groove 7. The other end of the rectangular frame 1 is placed on another support rod of the heat-resistant steel of the flower stand through the mounting plate 8. The positioning groove 7 serves to fix and limit the position, preventing the tooling from moving during the heat treatment process. The other end does not have a positioning groove 7 and only uses the mounting plate 8 to achieve the support effect. This is to ensure that the tooling can freely expand and contract in the high temperature environment, and to prevent the tooling from deforming and being unable to be effectively placed if positioning grooves are set at both ends.

[0034] (2) Arrange the double gear shaft parts that require heat treatment according to the attached... Figure 3 The part is placed on the rectangular frame 1 at the position shown. Since the total weight of the part is relatively light compared to the shaft diameter, this placement method will not cause large bending of the shaft. At the same time, the staggered placement can improve the space utilization rate, so that multiple double gear shaft parts can be processed at the same time in one heat treatment process, thus improving work efficiency. Note that the pinion and right gear of the two double gear shaft parts do not mesh with each other and are separated by the corresponding fixing plate 4.

[0035] (3) After the carburizing heat treatment is completed, the double gear shaft parts can be removed one by one.

[0036] The effectiveness of the heat-resistant tooling in this design was verified, as shown in Table 1 below. By comparing the end face runout data before and after using the tooling, it can be seen that the average end face runout before using the tooling was 0.201mm, and the average end face runout after using the tooling was 0.065mm. This indicates that the tooling can effectively control the end face runout of the right gear, improve the stability of product production, and at the same time, the subsequent gear grinding process was tracked. The gear grinding process was stable, and no black skin or uneven wear occurred.

[0037] Table 1. Differences in runout before and after using heat-resistant tooling

[0038] Serial number Vertical placement Fr / mm Serial number Profile H-rod placement Fr 1# 0.25 1# 0.05 2# 0.20 2# 0.06 3# 0.22 3# 0.08 4# 0.18 4# 0.1 5# 0.16 5# 0.07 6# 0.30 6# 0.05 7# 0.12 7# 0.06 8# 0.18 8# 0.05

[0039] The above are only preferred embodiments of the present application, and are not used to limit the present application, and for those skilled in the art, the present application can have various changes and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. In addition, it should be noted that the drawings are only used as examples, and are not drawn according to the condition of the same proportion, and should not be used as a limitation on the protection scope actually required by the present application.

Claims

1. A heat-resistant fixture for heat treatment of a double gear shaft, characterized in that: It includes a rectangular frame (1), partitions (2), connecting plates (3), fixing plates (4), and supporting structures; There are two partitions (2), which are centrally symmetrically arranged in the rectangular frame (1). One end of each partition is connected to the two shorter side walls of the rectangular frame (1), and the two partitions (2) are parallel to the two longer side walls of the rectangular frame (1). The two partitions (2) are fixedly connected by a connecting plate (3). The fixing plates (4) are provided in two sets, each set including two. One set of fixing plates (4) is vertically connected between a partition (2) and the longer side wall of the rectangular frame (1), and the other set of fixing plates (4) is vertically connected between another partition (2) and the other longer side wall of the rectangular frame (1). The positions of the one set of fixing plates (4) and the other set of fixing plates (4) within the rectangular frame (1) are also centrally symmetrical. The partition (2) is lower than or equal to the height of the two longer sidewalls in the rectangular frame (1), and the height of the fixing plate (4) is lower than the height of the two longer sidewalls in the rectangular frame (1). Each set of fixing plates (4) includes two fixing plates (4) with a gap between them, and a first arc-shaped slot (5) is provided on the upper edge of the longer side wall of the rectangular frame (1) located between the gaps, and a second arc-shaped slot (6) corresponding to the first arc-shaped slot (5) is provided on the upper edge of the other longer side wall of the rectangular frame (1). The support structure is located at the lower edges of the two longer side walls of the rectangular frame (1) and is used to limit the installation of the rectangular frame (1).

2. The heat-resistant tooling for heat treatment of a double gear shaft according to claim 1, characterized in that: The distance between each partition (2) and the longer sidewall of the side connected to the fixing plate (4) is greater than the distance between the partition (2) and the other longer sidewall.

3. The heat-resistant fixture for heat treatment of a double gear shaft according to claim 2, characterized in that: The radius of the first arc-shaped slot (5) is greater than the radius of the second arc-shaped slot (6).

4. The heat-resistant tooling for heat treatment of a double gear shaft according to claim 1, characterized in that: On the upper edge of the partition (2) located between the intervals of the two fixed plates (4) in each group, there is a support block (9) for supporting the double gear shaft.

5. The heat-resistant tooling for heat treatment of a double gear shaft according to claim 1, characterized in that: The support structure includes two positioning grooves (7) and two mounting plates (8). The two longer side walls of the rectangular frame (1) extend to the outside of the shorter side wall, and the two positioning grooves (7) are respectively provided at the lower edge of the same end of the two longer side walls, and the two mounting plates (8) are respectively provided at the other end.

6. The heat-resistant fixture for heat treatment of a double gear shaft according to claim 5, characterized in that: A first arc-shaped slot (5) is provided on the lower edge of the longer side wall of the rectangular frame (1) located between the intervals of each set of fixed plates (4), and a second arc-shaped slot (6) corresponding to the first arc-shaped slot (5) is provided on the lower edge of the other longer side wall of the rectangular frame (1); a support block (9) for supporting the double gear shaft is provided on the lower edge of the partition (2) located between the intervals of each set of fixed plates (4); the support structure also includes two other positioning slots (7), which are respectively provided on the upper edge of one end of the two longer side walls.

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