Tool for heat treatment of valve rod of internal combustion engine

Abstract

The utility model discloses a tool for heat treatment of a valve rod of an internal combustion engine, which relates to the field of heat treatment and comprises a base, the top of the base is provided with a pressing seat, the upper surface of the base and the lower surface of the pressing seat are respectively provided with a plurality of uniformly distributed first positioning grooves, and a spiral pressing mechanism is arranged between the base and the pressing seat; two adjusting telescopic pipes are symmetrically and fixedly arranged on one side of the base, the same auxiliary supporting seat is fixedly arranged at the ends, away from the base, of the two adjusting telescopic pipes, and a plurality of evenly-distributed second positioning grooves are formed in the upper surface of the auxiliary supporting seat. Through the collaborative design of double-fulcrum supporting and self-adaptive adjusting, the core defects of a traditional tool are overcome, the heat treatment quality of the valve rod is improved, and the high-precision heat treatment requirements of various internal combustion engine valve rods are met.

Description

Technical Field

[0001] This utility model relates to the field of heat treatment, specifically to a tooling for heat treatment of valve stems in internal combustion engines. Background Technology

[0002] As a core component of the engine's valve train system, the quality of its heat treatment directly affects the valve's sealing performance, wear resistance, and fatigue life. In heat treatment processes such as quenching, tempering, and carburizing, the tooling fixtures serve to fix the valve stem, ensuring the stability and uniformity of the heating and cooling processes.

[0003] However, existing tooling fixtures for heat treatment of internal combustion engine valve stems use a single support point design. If the valve stem is only clamped and positioned at one end, the valve stem is prone to bending and deformation during heat treatment (especially at high temperatures) due to thermal expansion or its own weight. For example, during quenching and cooling, the unfixed end of the valve stem may deflect due to uneven thermal stress, resulting in a significant increase in coaxiality error after heat treatment, which affects the subsequent assembly accuracy and sealing performance with the valve guide.

[0004] To address this, a tooling for heat treatment of valve stems in internal combustion engines is proposed. Utility Model Content

[0005] In view of the problems existing in the heat treatment of valve stems of internal combustion engines, this utility model is proposed.

[0006] Therefore, the purpose of this utility model is to provide a tooling for heat treatment of valve stems in internal combustion engines, which solves the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A tooling for heat treatment of valve stems of internal combustion engines includes a base, a pressure seat on the top of the base, a plurality of evenly distributed first positioning grooves on the upper surface of the base and the lower surface of the pressure seat, and a spiral clamping mechanism between the base and the pressure seat.

[0009] Two adjustable telescopic tubes are symmetrically fixed on one side of the base. The two adjustable telescopic tubes are fixed with the same auxiliary support at the end away from the base. The upper surface of the auxiliary support is provided with multiple evenly distributed second positioning grooves.

[0010] Preferably, the spiral pressing mechanism includes fixed blocks fixedly disposed on both sides of the base. Support rods are fixedly disposed on the upper surfaces of both fixed blocks. The upper ends of the two support rods are fixedly disposed on the same fixed plate, and the fixed plate is located above the pressure seat. A screw is vertically threaded in the middle of the fixed plate. The lower end of the screw is rotatably connected to the center of the upper surface of the fixed plate, and a turntable is fixedly disposed on the upper end of the screw.

[0011] Preferably, sliders are fixedly provided on both sides of the pressure seat, and the two sliders are slidably connected to the walls of the two support rods respectively.

[0012] Preferably, the first positioning groove on the base and the first positioning groove on the pressure seat form a circular groove.

[0013] Furthermore, the adjustable telescopic tube includes a fixed tube fixedly disposed on the side wall of the base, the fixed tube having a movable tube inside, and the end of the movable tube away from the fixed tube being fixedly connected to the side wall of the auxiliary support seat, and the wall of the fixed tube being threaded with a fixing bolt that abuts against the wall of the movable tube.

[0014] Preferably, both the interior of the first positioning groove and the interior of the second positioning groove are provided with a plurality of evenly distributed ventilation holes.

[0015] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0016] This utility model, through the provision of a base and an auxiliary support, forms a double-support point, which, together with the upper and lower positioning grooves of the pressure seat, clamps the valve stem in both circumferential and axial directions, thereby offsetting the bending force caused by gravity and thermal expansion, avoiding the deflection deformation caused by traditional single support, and ensuring that the coaxiality and straightness of the valve stem meet high precision requirements after heat treatment.

[0017] This utility model, through the provision of an adjustable telescopic tube, allows for quick adjustment of the position of the auxiliary support seat by adjusting the extension and retraction of the fixed and movable tubes of the telescopic tube. It is compatible with valve stems of different lengths, reduces the number of special tooling, and lowers changeover costs and time.

[0018] With the provided spiral clamping mechanism, the operator drives the screw through the turntable to raise and lower the pressure seat. With the guide and limit of the slider, the clamping process can be completed by simply rotating the turntable, which is convenient and significantly improves the efficiency of the production line. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a side view of the base and pressure seat of this utility model;

[0022] Figure 3 This is a perspective view of the adjustable telescopic tube of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Base; 2. Pressure seat; 3. First positioning groove; 4. Adjustable telescopic tube; 5. Auxiliary support seat; 6. Second positioning groove; 7. Fixing block; 8. Support rod; 9. Fixing plate; 10. Screw; 11. Turntable; 12. Slider; 13. Fixing tube; 14. Moving tube; 15. Fixing bolt; 16. Vent hole. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0026] This utility model provides, for example Figure 1-3 The tooling shown includes a base 1 for heat treatment of an internal combustion engine valve stem. A pressure seat 2 is provided on the top of the base 1. Multiple evenly distributed first positioning grooves 3 are formed on the upper surface of the base 1 and the lower surface of the pressure seat 2. A spiral clamping mechanism is provided between the base 1 and the pressure seat 2. The spiral clamping mechanism includes fixing blocks 7 fixedly disposed on both sides of the base 1. Support rods 8 are fixedly disposed on the upper surfaces of both fixing blocks 7. The upper ends of the two support rods 8 are fixedly disposed on the same fixing plate 9, which is located above the pressure seat 2. A screw 10 is vertically threaded in the middle of the fixing plate 9, and the lower end of the screw 10 is aligned with the center of the upper surface of the fixing plate 9. The screw 10 is rotatably connected, and a turntable 11 is fixedly provided at the upper end of the screw 10. Sliders 12 are fixedly provided on both sides of the pressure seat 2. The two slides 12 are slidably connected to the walls of the two support rods 8 respectively. The slides 13 are slidably connected to the support rods 8 to limit the sliding of the pressure seat 2, ensuring that the screw 10 drives the pressure seat 2 to move up and down. The turntable 11 drives the screw 10 to rotate. The lower end of the screw 10 is rotatably connected to the pressure seat 2. As the screw 10 rotates, the pressure seat 2 slides down along the slides 12 on the support rods 8 until the first positioning groove 3 of the pressure seat 2 is completely fitted with the first positioning groove 3 of the base 1, forming a circumferential clamping of the valve stem.

[0027] Two adjustable telescopic tubes 4 are symmetrically fixed on one side of the base 1. The two adjustable telescopic tubes 4 are fixed with the same auxiliary support 5 at the ends away from the base 1. The upper surface of the auxiliary support 5 is provided with multiple evenly distributed second positioning grooves 6. The first positioning groove 3 on the base 1 and the first positioning groove 3 on the pressure seat 2 form a circular groove. Multiple evenly distributed vent holes 16 are provided inside the first positioning groove 3 and the second positioning groove 6, which can ensure that the medium contacts the valve stem through the vent holes 16, thereby improving the heat treatment effect of the valve stem.

[0028] The adjustable telescopic tube 4 includes a fixed tube 13 fixedly installed on the side wall of the base 1. The fixed tube 13 has a movable tube 14 inside, and the end of the movable tube 14 away from the fixed tube 13 is fixedly connected to the side wall of the auxiliary support seat 5. The wall of the fixed tube 13 is threaded with a fixing bolt 15 that abuts against the wall of the movable tube 14. The operator can adjust the length of the movable tube 14 inside the fixed tube 13 by loosening the fixing bolt 15 with a wrench.

[0029] When in use, first, adjust the position of the auxiliary support seat 5 according to the length of the valve stem to be processed. Loosen the fixing bolt 15 on the adjusting telescopic tube 4 with a wrench, slide the moving tube 14 along the fixing tube 13 to make the distance between the auxiliary support seat 5 and the base 1 match the length of the valve stem. After the adjustment is completed, tighten the fixing bolt 15 to lock the position.

[0030] Then, place the valve stem in the first positioning groove 3 of the base 1, and align the other end with the second positioning groove 6 of the auxiliary support seat 5 to ensure that the valve stem is in a horizontal state.

[0031] The operator rotates the turntable 11 to drive the screw 10 to rotate. The lower end of the screw 10 is rotatably connected to the pressure seat 2. As the screw 10 rotates, the pressure seat 2 slides down along the slider 12 on the support rod 8 until the first positioning groove 3 of the pressure seat 2 and the first positioning groove 3 of the base 1 are completely fitted together, forming a circumferential clamping of the valve stem. At this time, the valve stem is fixed between the upper and lower circular positioning grooves, and the middle and the entire length are evenly supported, avoiding stress concentration at a single clamping point.

[0032] The second positioning groove 6 of the auxiliary support seat 5 provides support for the end of the valve stem, forming a double support structure with the base 1. This design counteracts the bending force of the valve stem caused by gravity and thermal expansion during heat treatment, ensuring that the valve stem maintains straightness during high temperature or cooling stages and reducing the risk of deformation.

[0033] In processes such as quenching and carburizing, the medium inside the heat treatment equipment contacts the valve stem surface evenly through the vent holes 16 in the first positioning groove 3 and the second positioning groove 6. The vent hole 16 design avoids the clamps from blocking the flow of the medium, ensuring consistent heat conduction around the valve stem, improving the uniformity of heating or cooling, and avoiding structural defects caused by local overheating or uneven cooling.

[0034] After the heat treatment process is completed, the turntable 11 is rotated in the opposite direction, and the screw 10 drives the pressure seat 2 to rise and reset, loosening the clamp on the valve stem. After the valve stem is taken out, if valve stems of different lengths need to be processed, the position of the auxiliary support seat 5 can be repeatedly adjusted to adapt to the new specifications, realizing the quick change of tooling and universal application.

[0035] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A tooling for heat treatment of valve stems in internal combustion engines, comprising a base (1), characterized in that: The base (1) is provided with a pressure seat (2) at the top. Multiple evenly distributed first positioning grooves (3) are provided on the upper surface of the base (1) and the lower surface of the pressure seat (2). A spiral pressing mechanism is provided between the base (1) and the pressure seat (2). Two adjustable telescopic tubes (4) are symmetrically fixed on one side of the base (1). The two adjustable telescopic tubes (4) are fixed with the same auxiliary support seat (5) at the end away from the base (1). The upper surface of the auxiliary support seat (5) is provided with multiple evenly distributed second positioning grooves (6).

2. The tooling for heat treatment of internal combustion engine valve stems according to claim 1, characterized in that: The spiral pressing mechanism includes fixed blocks (7) fixedly disposed on both sides of the base (1). Support rods (8) are fixedly disposed on the upper surfaces of the two fixed blocks (7). The upper ends of the two support rods (8) are fixedly disposed on the same fixed plate (9). The fixed plate (9) is located above the pressure seat (2). A screw (10) is vertically threaded in the middle of the fixed plate (9). The lower end of the screw (10) is rotatably connected to the center of the upper surface of the fixed plate (9). A turntable (11) is fixedly disposed on the upper end of the screw (10).

3. The tooling for heat treatment of internal combustion engine valve stems according to claim 2, characterized in that: Both sides of the pressure seat (2) are fixedly provided with sliders (12), and the two sliders (12) are slidably connected to the rod walls of the two support rods (8).

4. The tooling for heat treatment of internal combustion engine valve stems according to claim 1, characterized in that: The first positioning groove (3) located on the base (1) and the first positioning groove (3) located on the pressure seat (2) form a circular groove.

5. The tooling for heat treatment of internal combustion engine valve stems according to claim 1, characterized in that: The adjustable telescopic tube (4) includes a fixed tube (13) fixedly installed on the side wall of the base (1). The fixed tube (13) has a movable tube (14) inside, and the end of the movable tube (14) away from the fixed tube (13) is fixedly connected to the side wall of the auxiliary support seat (5). The wall of the fixed tube (13) is threaded with a fixing bolt (15) that abuts against the wall of the movable tube (14).

6. The tooling for heat treatment of valve stems in internal combustion engines according to claim 1, characterized in that: Multiple evenly distributed ventilation holes (16) are provided inside the first positioning groove (3) and the second positioning groove (6).

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