Balanced elbow internal spline manufacturing process

Abstract

The invention provides a balance elbow internal spline manufacturing process which comprises the following steps that S1, a spline inner hole is machined in a balance elbow, and the spline inner hole is machined to the lower difference of the preset size; s2, the spline inner hole is subjected to high-frequency quenching; s3, the spline inner hole is machined to a preset size; s4, the internal spline is machined in the spline inner hole through medium-speed wire cutting; and S5, high-temperature tempering is conducted on the internal spline. According to the manufacturing process for the internal spline of the balance elbow, the internal spline is processed after heat treatment, the technical problem of large deformation of the internal spline after heat treatment is avoided, the manufacturing precision of the internal spline is improved, an electric pulse process is not needed, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of balanced elbow internal splines, and in particular to a manufacturing process of a balanced elbow internal spline. Background Art

[0002] The balance elbow internal spline is a key component in tracked vehicles. It connects the road wheel and the torque shaft, and plays the role of transmitting torque and bearing impact force.

[0003] In the prior art, the manufacturing process of the internal spline of the balance elbow includes: machining, rough drawing of the internal spline, quenching, fine drawing of the internal spline, high frequency quenching and electric pulse spline. That is, heat treatment is performed after rough drawing of the internal spline and fine drawing of the internal spline. This processing method has the following disadvantages:

[0004] 1. After rough drawing and finishing drawing of the internal spline, heat treatment is performed separately, which increases the manufacturing cost;

[0005] 2. The internal spline is finely drawn before the heat treatment process, and there is no further processing after the heat treatment. The internal spline is greatly deformed after the heat treatment, which reduces the manufacturing accuracy of the internal spline.

[0006] Therefore, in view of the above technical problems, a manufacturing process of a balanced elbow internal spline is proposed. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention proposes a manufacturing process for a balanced elbow internal spline, which improves the manufacturing accuracy of the internal spline and reduces the manufacturing cost.

[0008] A manufacturing process for a balanced elbow internal spline comprises the following steps:

[0009] S1: Adding a spline inner hole on the balancing elbow, and machining the spline inner hole to a preset size;

[0010] S2: high frequency quenching the inner hole of the spline;

[0011] S3: machining the spline inner hole to a preset size;

[0012] S4: machining an internal spline in the inner hole of the spline by using medium wire cutting;

[0013] S5: High temperature tempering is performed on the internal spline.

[0014] Furthermore, step S1 specifically includes: firstly, rough and fine drilling the spline inner hole, then rough and fine milling the upper end face of the spline inner hole, then boring the spline inner hole to the lower difference of the preset size, counteracting the hole mouth angle, and finally, rough and fine milling the lower end face of the spline inner hole, counteracting the hole mouth angle.

[0015] Furthermore, step S2 specifically includes: the spline inner hole high-frequency quenching layer has a depth of 4-5 mm and a hardness of ≥55HRC.

[0016] Furthermore, the spline inner hole after high-frequency quenching is subjected to sand blasting.

[0017] Furthermore, step S3 specifically includes: in a vertical machining center, machining to the preset size using a cubic boron nitride blade.

[0018] Furthermore, step S4 specifically includes: machining the internal spline in two cuts, leaving a set machining allowance in the first cut to perform finishing machining in the second cut.

[0019] Furthermore, the machining allowance is 0.5 mm.

[0020] Further, step S5 specifically includes: the tempering temperature is 170°, the tempering time is 3 hours, and air cooling is performed after the tempering is completed.

[0021] Furthermore, the high frequency quenching adopts a high frequency quenching mechanism, and the high frequency quenching mechanism comprises:

[0022] The high-frequency quenching equipment body has an induction heating coil on one side that can extend into the inner hole of the spline;

[0023] A mounting frame, with an electric telescopic rod vertically arranged at the bottom end, and the fixed end of the electric telescopic rod is connected to the main body of the high-frequency quenching equipment;

[0024] A rotating assembly, comprising a rotating disk and a motor, wherein the rotating disk is coaxially located below the induction heating coil and rotatably arranged on the mounting frame, and the motor is arranged on the mounting frame, and an output end is coaxially connected to the rotating disk;

[0025] The positioning clamping assembly comprises an arc-shaped clamping block and a driving assembly, two groups of guide shafts are vertically arranged at the top of the turntable, a positioning plate is commonly arranged at the top of the two groups of guide shafts, a positioning groove is opened at the top of the positioning plate, the bottom end of the end of the balancing elbow with the spline inner hole can be clamped in the positioning groove, and the spline inner hole is made coaxial with the induction heating coil, two groups of arc-shaped clamping blocks are horizontally slidably arranged on the positioning plate, the positioning groove is located between the two groups of arc-shaped clamping blocks, the driving assembly is arranged on the positioning plate, and is connected to the two groups of arc-shaped clamping blocks, and is used to drive the two groups of arc-shaped clamping blocks to slide relatively close to or away from each other.

[0026] Furthermore, the driving assembly includes a slider, a connecting rod and a screw; the slider is slidably mounted on the two groups of guide shafts in a vertical direction, and two groups of through grooves are opened on the positioning plate in a vertical direction. The two groups of through grooves are both provided with fixed shafts, and the bottom ends of the two groups of arc-shaped clamping blocks are both provided with fixed blocks. The two groups of fixed blocks are horizontally slidably arranged in the two groups of through grooves and are mounted on the fixed shafts. The bottom ends of the two groups of fixed blocks are hinged with the connecting rod, and the bottom ends of the two groups of connecting rods are hinged to the slider, and the screw is vertically and rotatably arranged on the positioning plate and is threadedly connected to the slider.

[0027] The present invention provides a manufacturing process for the internal spline of a balancing elbow, comprising the following steps: S1: machining a spline inner hole on the balancing elbow, and processing the spline inner hole to a lower difference of a preset size; S2: high-frequency quenching the spline inner hole; S3: processing the spline inner hole to a preset size; S4: using medium-speed wire cutting to process the internal spline in the spline inner hole; S5: high-temperature tempering the internal spline. The above-mentioned manufacturing process for the internal spline of the balancing elbow processes the internal spline after heat treatment, thereby avoiding the technical problem of large deformation of the internal spline after heat treatment, improving the manufacturing accuracy of the internal spline, and not requiring an electric pulse process, thereby reducing the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation of the present invention, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0029] Figure 1 A flow chart of a manufacturing process of a balanced elbow internal spline provided by one embodiment of the present invention;

[0030] Figure 2 for Figure 1 A three-dimensional structural schematic diagram of a high-frequency quenching mechanism in a manufacturing process of a balanced elbow internal spline is shown;

[0031] Figure 3 for Figure 1 A schematic diagram of the local structure of a high-frequency quenching mechanism in a manufacturing process of a balanced elbow internal spline is shown;

[0032] Figure 4 for Figure 1 An exploded view of the local structure of a high-frequency quenching mechanism in a manufacturing process of a balanced elbow internal spline is shown.

[0033] Reference numerals:

[0034] 10. High frequency quenching equipment body; 101. Induction heating coil;

[0035] 20. Mounting frame; 201. Electric telescopic rod;

[0036] 30, turntable; 301, motor; 302, guide shaft; 303, positioning plate; 304, positioning groove; 305, through groove; 306, fixed shaft;

[0037] 40. Arc-shaped clamping block; 401. Sliding block; 402. Connecting rod; 403. Screw rod; 404. Fixed block. DETAILED DESCRIPTION

[0038] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0039] See also Figure 1 , a manufacturing process of a balanced elbow internal spline in one embodiment comprises the following steps;

[0040] S1: Machine the spline inner hole on the balancing elbow, and process the spline inner hole to the preset size. Further, step S1 specifically includes: first, rough and fine drill the spline inner hole, then rough and fine mill the upper end face of the spline inner hole, then bore the spline inner hole to the preset size, chamfer the hole mouth angle, and finally rough and fine mill the lower end face of the spline inner hole, chamfer the hole mouth angle. Specifically, the preset size difference is φ92.8+0.03mm, the surface roughness of the upper and lower end faces of the spline inner hole is Ra6.3, the verticality of the upper and lower end faces of the spline inner hole relative to the axis of the spline inner hole is 0.1mm, the chamfer of the upper end hole of the spline inner hole is 1X45°, the chamfer depth of the lower end hole is 2mm, and the angle is 30°.

[0041] S2: High frequency quenching the inner hole of the spline. Further, step S2 specifically includes: the inner hole of the spline is high frequency quenched to a depth of 4-5 mm and a hardness of ≥55 HRC.

[0042] S3: Processing the spline inner hole to a preset size. Further, step S3 specifically includes: using a cubic boron nitride blade to process the spline inner hole to a preset size in a vertical machining center. Specifically, the preset size is φ93+0.03 mm.

[0043] S4: Use medium wire cutting to process the internal spline in the inner hole of the spline. Further, step S4 specifically includes: processing the internal spline in two cuts, leaving a set processing allowance for the first cut to perform the second cut fine processing. Specifically, the processing allowance is 0.5mm. Processing the internal spline in two cuts ensures the processing accuracy of the internal spline.

[0044] S5: High temperature tempering of the internal spline. Further, step S5 specifically includes: tempering temperature of 170°, tempering time of 3 hours, and air cooling after tempering. Eliminating the internal stress of the internal spline wire cutting can improve the dimensional stability of the internal spline, prevent the internal spline from cracking and damage, improve the fatigue resistance of the internal spline and improve the surface quality of the internal spline.

[0045] On the basis of the above-mentioned manufacturing process of the internal spline of the balancing elbow, further, the inner hole of the spline after high-frequency quenching is subjected to sand blasting. The sand blasting process can clean the oxides generated by high-frequency quenching, so as to facilitate the subsequent processing of the internal spline.

[0046] See also Figures 2 to 4 In one embodiment, high frequency quenching adopts a high frequency quenching mechanism, which includes a high frequency quenching equipment body 10, a mounting frame 20, a rotating component and a positioning clamping component.

[0047] Among them, an induction heating coil 101 that can be inserted into the inner hole of the spline is arranged on one side of the high-frequency quenching equipment body 10. An electric telescopic rod 201 is vertically arranged at the bottom end of the mounting frame 20, and the fixed end of the electric telescopic rod 201 is connected to the high-frequency quenching equipment body 10. The rotating assembly includes a turntable 30 and a motor 301. The turntable 30 is coaxially located below the induction heating coil 101 and rotatably arranged on the mounting frame 20. The motor 301 is arranged on the mounting frame 20, and the output end is coaxially connected to the turntable 30. The positioning clamping assembly includes an arc-shaped clamping block 40 and a driving assembly. Two groups of guide shafts 302 are vertically arranged at the top of the turntable 30. A positioning plate 303 is commonly arranged at the top of the two groups of guide shafts 302. A positioning groove 304 is opened at the top of the positioning plate 303. The bottom end of the end of the balancing elbow with a spline inner hole can be clamped in the positioning groove 304, and the spline inner hole is made coaxial with the induction heating coil 101. Two groups of arc-shaped clamping blocks 40 are horizontally slidably arranged on the positioning plate 303. The positioning groove 304 is located between the two groups of arc-shaped clamping blocks 40. The driving assembly is arranged on the positioning plate 303 and is connected to the two groups of arc-shaped clamping blocks 40 for driving the two groups of arc-shaped clamping blocks 40 to slide relatively close to or away from each other.

[0048] In the above embodiment, the bottom end of the end portion of the balancing elbow with the spline inner hole can be clamped in the positioning groove 304. At this time, the positioning groove 304 can position the balancing elbow so that the spline inner hole is coaxial with the induction heating coil 101, and then the driving component is controlled to drive the two groups of arc clamping blocks 40 to move relatively close. The two groups of arc clamping blocks 40 can clamp and fix the balancing elbow by moving relatively close. Then, the electric telescopic rod 201 is controlled to extend. The extension of the electric telescopic rod 201 drives the mounting frame 20 to move upward. The upward movement of the mounting frame 20 can drive the balancing elbow to move upward, so that the induction heating coil 101 is inserted into the spline inner hole. Finally, the induction heating coil 101 and the motor 301 are started, and the induction heating coil 101 is 01 starts to heat the inner hole of the spline, and the motor 301 starts to drive the balancing elbow to rotate through the turntable 30, so that the induction heating coil 101 heats the inner hole of the spline and the inner hole of the spline rotates at the same time. After the high-frequency quenching is completed, the electric telescopic rod 201 is controlled to contract to make the induction heating coil 101 withdraw from the inner hole of the spline, and then the driving component is controlled to drive the two groups of arc clamping blocks 40 to move away from each other to cancel the fixation of the balancing elbow, and finally the balancing elbow can be taken out from the positioning groove 304. The fixing and canceling of the balancing elbow are convenient, and the spline inner hole can rotate while the induction heating coil 101 heats the inner hole of the spline, thereby improving the uniformity of the heating of the inner hole of the spline, thereby improving the effect of high-frequency quenching of the inner hole of the spline.

[0049] On the basis of the above embodiments, further, the driving assembly includes a slider 401, a connecting rod 402 and a screw 403; the slider 401 is slidably mounted on the two groups of guide shafts 302 in the vertical direction, and two groups of through grooves 305 are opened on the positioning plate 303 in the vertical direction. The two groups of through grooves 305 are both provided with fixed shafts 306, and the bottom ends of the two groups of arc-shaped clamping blocks 40 are both provided with fixed blocks 404, and the two groups of fixed blocks 404 are respectively horizontally slidably arranged in the two groups of through grooves 305 and mounted on the fixed shaft 306. The bottom ends of the two groups of fixed blocks 404 are hinged with connecting rods 402, and the bottom ends of the two groups of connecting rods 402 are hinged to the slider 401, and the screw 403 is vertically rotatably arranged on the positioning plate 303 and is threadedly connected to the slider 401.

[0050] In the above embodiment, the slider 401 is driven to move downward by rotating the screw 403 and the slider 401 threadedly cooperate. The slider 401 moves downward and can drive the two groups of arc-shaped clamping blocks 40 to move relatively close to each other through the two groups of connecting rods 402. The slider 401 is driven to move upward by rotating the screw 403 and the slider 401 threadedly cooperate. The slider 401 moves upward and can drive the two groups of arc-shaped clamping blocks 40 to move relatively away from each other through the two groups of connecting rods 402. It is convenient to drive the two groups of arc-shaped clamping blocks 40 to move relatively close to or away from each other, and stop rotating the screw 403. At this time, the screw 403 and the slider 401 threadedly cooperate to form a self-locking function to fix the two groups of arc-shaped clamping blocks 40, which is convenient for fixing the two groups of arc-shaped clamping blocks 40.

[0051] When the above process is used to process the internal spline of the balancing elbow, the technical problem of large deformation of the internal spline after heat treatment is avoided, the manufacturing accuracy of the internal spline is improved, and no electric pulse process is required, thereby reducing the manufacturing cost.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A manufacturing process for a balanced elbow internal spline, characterized in that: The following steps are involved: S1: Adding a spline inner hole on the balancing elbow, and machining the spline inner hole to a preset size; S2: high frequency quenching the inner hole of the spline; S3: machining the spline inner hole to a preset size; S4: machining an internal spline in the inner hole of the spline by using medium wire cutting; S5: High temperature tempering is performed on the internal spline.

2. A manufacturing process for a balanced elbow internal spline according to claim 1, characterized in that: Step S1 specifically includes: firstly, rough and fine drilling the spline inner hole, then rough and fine milling the upper end face of the spline inner hole, then boring the spline inner hole to the lower difference of the preset size, chamfering the hole mouth angle, and finally, rough and fine milling the lower end face of the spline inner hole, chamfering the hole mouth angle.

3. A manufacturing process for a balanced elbow internal spline according to claim 1, characterized in that: Step S2 specifically includes: the spline inner hole high-frequency quenching layer has a depth of 4-5 mm and a hardness of ≥55 HRC.

4. A manufacturing process for a balanced elbow internal spline according to claim 3, characterized in that: The spline inner hole after high-frequency quenching is subjected to sand blasting.

5. A manufacturing process for a balanced elbow internal spline according to claim 1, characterized in that: Step S3 specifically includes: using a cubic boron nitride blade to process to the preset size in a vertical machining center.

6. A manufacturing process for a balanced elbow internal spline according to claim 1, characterized in that: Step S4 specifically includes: machining the internal spline in two cuts, leaving a set machining allowance in the first cut to perform finishing machining in the second cut.

7. A manufacturing process for a balanced elbow internal spline according to claim 6, characterized in that: The machining allowance is 0.5 mm.

8. The manufacturing process of a balanced elbow internal spline according to claim 1, characterized in that: Step S5 specifically includes: the tempering temperature is 170°, the tempering time is 3 hours, and air cooling is performed after the tempering is completed.

9. A manufacturing process for a balanced elbow internal spline according to claim 1, characterized in that: High frequency quenching adopts a high frequency quenching mechanism, and the high frequency quenching mechanism includes: A high-frequency quenching equipment body (10) is provided on one side with an induction heating coil (101) capable of extending into the inner hole of the spline; A mounting frame (20) having an electric telescopic rod (201) vertically arranged at the bottom end, wherein the fixed end of the electric telescopic rod (201) is connected to the high-frequency quenching equipment body (10); A rotating assembly, comprising a rotating disk (30) and a motor (301), wherein the rotating disk (30) is coaxially located below the induction heating coil (101) and rotatably arranged on the mounting frame (20), and the motor (301) is arranged on the mounting frame (20), and an output end is coaxially connected to the rotating disk (30); A positioning clamping assembly comprises an arc-shaped clamping block (40) and a driving assembly, wherein two groups of guide shafts (302) are vertically arranged at the top of the turntable (30), and a positioning plate (303) is commonly arranged at the top of the two groups of guide shafts (302), and a positioning groove (304) is opened at the top of the positioning plate (303), and the bottom end of the end of the balance elbow with the spline inner hole can be clamped in the positioning groove (304), and the spline inner hole is made coaxial with the induction heating coil (101), and two groups of arc-shaped clamping blocks (40) are horizontally slidably arranged on the positioning plate (303), and the positioning groove (304) is located between the two groups of arc-shaped clamping blocks (40), and the driving assembly is arranged on the positioning plate (303) and connected to the two groups of arc-shaped clamping blocks (40), and is used to drive the two groups of arc-shaped clamping blocks (40) to slide relatively close to or away from each other.

10. A manufacturing process for a balanced elbow internal spline according to claim 9, characterized in that: The driving assembly comprises a slider (401), a connecting rod (402) and a screw rod (403); the slider (401) is slidably sleeved on the two groups of guide shafts (302) in the vertical direction, the positioning plate (303) is provided with two groups of through grooves (305) in the vertical direction, the two groups of through grooves (305), both groups of through grooves (305) are provided with fixed shafts (306), and the bottom ends of the two groups of arc-shaped clamping blocks (40) are both provided with fixed blocks ( 404), the two groups of fixed blocks (404) are respectively horizontally slidably arranged in the two groups of through grooves (305), and are sleeved on the fixed shaft (306), the bottom ends of the two groups of fixed blocks (404) are hinged with the connecting rod (402), the bottom ends of the two groups of connecting rods (402) are hinged with the slider (401), and the screw rod (403) is vertically rotatably arranged on the positioning plate (303) and is threadedly connected to the slider (401).

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