Rail quenching fixture

Abstract

The embodiment of the utility model provides a guide rail quenching fixture relates to heat treatment process equipment field. This guide rail quenching fixture includes a plurality of clamping pieces, and each clamping piece is opened with accommodating groove along the length direction, and a plurality of clamping pieces are oppositely arranged, so that the accommodating groove of two opposite clamping pieces cooperates with each other, thereby forming guide rail straightening groove, and a plurality of locking holes are arranged in the clamping piece, and a plurality of fixing pieces are arranged, and a plurality of fixing pieces cooperate with a plurality of locking holes, thereby restricting and fixing a plurality of clamping pieces. The guide rail is placed in the guide rail straightening groove, and the upper and lower clamping pieces are fixed by the synergistic effect of a plurality of fixing pieces, and this rigid constraint can ensure that the guide rail does not displace relative to the guide rail straightening groove in the whole quenching process, and can also make the stress evenly dispersed to the oppositely arranged multiple clamping pieces, thereby reducing the local damage of the guide rail.

Description

Technical Field

[0001] This utility model relates to the field of heat treatment process equipment, and more specifically, to a guide rail quenching fixture. Background Technology

[0002] For heat treatment of high-hardness, highly deformation-sensitive materials such as martensitic stainless steel, straightening during quenching (i.e., hot straightening) is a crucial process requirement. For martensitic stainless steel guide rails (such as 420 and 440C), the hardness after quenching reaches HRC 50–60. Cold straightening requires extremely high pressure, easily leading to micro-cracks in the guide rails, and even direct breakage. Furthermore, quenching deformation is unpredictable: even with optimized heating / cooling uniformity, the guide rails can still undergo complex deformations (bending, twisting, etc.) due to differences in cross-section and furnace loading methods.

[0003] In existing technologies, three-point bending straightening is a common mechanical straightening method during the quenching process. Its principle involves applying a reverse force to the convex side of the bend through two fixed support points and a middle pressure point, primarily used to correct bending deformations caused by quenching stress. However, three-point bending straightening during quenching relies heavily on operational experience and carries the risk of over-straightening, potentially causing straightening damage near the straightening point. Utility Model Content

[0004] This invention provides a guide rail quenching fixture that can evenly distribute stress and reduce local damage through multiple clamping parts arranged in opposite directions.

[0005] The embodiments of this utility model can be implemented as follows:

[0006] An embodiment of this utility model provides a guide rail quenching fixture, which includes:

[0007] Multiple clamping members, each clamping member having a receiving groove along its length, the multiple clamping members being arranged opposite each other such that the receiving grooves of two opposite clamping members cooperate with each other to form a guide rail straightening groove, multiple locking holes being provided through both sides of the clamping members; and multiple fixing members, the multiple fixing members cooperating with the multiple locking holes to clamp and fix the multiple clamping members.

[0008] In an optional embodiment, the plurality of clamping members includes a first clamping member, and the receiving grooves are formed on two opposite sides of each clamping member along its length.

[0009] In an optional embodiment, the locking hole of the first clamping member is partly countersunk and partly straight, with the straight holes and the countersunk holes spaced apart.

[0010] In an optional embodiment, the straight hole on the first clamping member and the countersunk hole adjacent to the straight hole constitute a hole group, and the first clamping member has multiple hole groups, which are symmetrically distributed on both sides of the receiving groove.

[0011] In an optional embodiment, the locking holes of the first clamping member are all countersunk holes.

[0012] In an optional embodiment, the locking holes of the first clamping member are all straight holes.

[0013] In an optional embodiment, the plurality of clamps includes a second clamping member, and the locking holes on both sides of the second clamping member are all formed with straight holes.

[0014] In an optional embodiment, the plurality of receiving slots have a first inner wall, the width D1 of which satisfies: D1=W+Δ, where W is the standard width of the guide rail to be clamped, Δ is the width compensation amount, and 0.15cm≤Δ≤0.4cm.

[0015] In an optional implementation, the width compensation amount Δ = 0.2 cm.

[0016] In an optional embodiment, the plurality of receiving slots have a second inner wall disposed opposite to each other, the height D2 of the second inner wall satisfying: D2=Y+δ, where Y is the standard height of the guide rail to be clamped, δ is the height compensation amount, and 0.05cm≤δ≤1.5cm.

[0017] The beneficial effects of the guide rail quenching fixture of this utility model embodiment include, for example:

[0018] This guide rail quenching fixture includes multiple clamping members, each with a receiving groove along its length. The clamping members are arranged opposite each other, with the receiving grooves of two opposing clamping members engaging to form a guide rail straightening groove. Multiple locking holes are provided through each clamping member. Additionally, multiple fixing members engage with the locking holes to clamp and fix the clamping members in place. During operation, the fixing members constrain and fix two opposing clamping members, and the guide rail straightening groove formed by the engaging receiving grooves of the opposing clamping members accommodates the guide rail to be quenched. The four inner walls of the receiving groove provide omnidirectional constraint on the guide rail during the quenching process, achieving a uniform stress field distribution and simultaneously completing low-damage straightening during the quenching stage. More importantly, this integrated straightening method provides a more stable reference surface for subsequent processing, significantly reducing the difficulty of adjustments in subsequent straightening processes. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the guide rail quenching fixture provided in this embodiment;

[0021] Figure 2 This is a first-view schematic diagram of the guide rail quenching fixture provided in this embodiment;

[0022] Figure 3 This is a second-view schematic diagram of the guide rail quenching fixture provided in this embodiment;

[0023] Figure 4 for Figure 3 Sectional view at point AA;

[0024] Figure 5 This is a cross-sectional view of the guide rail quenching fixture provided in this embodiment.

[0025] Icons: 100-Guide rail quenching fixture; 10-Clamping component; 12-Accommodation groove; 13-Guide rail straightening groove; 14-Locking hole; 101-First clamping component; 102-Second clamping component; 121-First inner wall; 123-Second inner wall. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0031] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0032] As mentioned in the background section, straightening (i.e., hot straightening) during quenching is an important technological necessity.

[0033] In the existing technology, although the three-point bending straightening fixture can effectively correct workpiece deformation, there are still technical defects and limitations: during the quenching process, the guide rail undergoes bending deformation, and the three-point fixing method will lead to excessive contact stress at the pressure point, which will deteriorate the surface roughness of the guide rail and cause local damage to the guide rail.

[0034] Therefore, the guide rail quenching fixture 100 provided in the embodiments of this utility model can solve the above problems, and will be described in detail below.

[0035] A guide rail quenching fixture 100 includes a plurality of clamping members 10, each clamping member 10 having a receiving groove 12 along its length. The plurality of clamping members 10 are arranged opposite each other, such that the receiving grooves 12 of two opposite clamping members 10 cooperate with each other to form a guide rail straightening groove 13. A plurality of locking holes 14 are provided through both sides of the clamping members 10; and a plurality of fixing members, the plurality of fixing members cooperating with the plurality of locking holes 14 to constrain and fix the plurality of clamping members 10.

[0036] Reference Figure 1 , Figure 2 and Figure 4In this embodiment, there are two clamping members 10, and the receiving grooves 12 opened along the length direction of each clamping member 10 are exactly the same. The two oppositely arranged receiving grooves 12 cooperate with each other to form a guide rail straightening groove 13. The guide rail to be quenched is accurately positioned and installed into the guide rail straightening groove 13 of this guide rail quenching fixture 100. Multiple locking holes 14 are provided through both sides of the clamping member 10. Here, "both sides" specifically refers to the two sides of the clamping member 10 that are symmetrical about the left and right along the length axis. The upper and lower clamping members 10 are constrained and fixed by the synergistic action of multiple fixing members. This rigid constraint can ensure that the deformation stress on the guide rail during the entire quenching process is dispersed, which can reduce local damage to the guide rail.

[0037] Optionally, receiving slots 12 are provided on two opposite sides of each clamping member 10 along its length.

[0038] refer to Figure 2 The two opposing clamping members 10 each have four receiving slots 12. The two opposing receiving slots 12 cooperate to form a guide rail straightening slot 13, which is used to accommodate the guide rail to be quenched. Of course, in other embodiments of this utility model, the number of clamping members 10 is three, four, or more. Multiple clamping members 10 are stacked relative to each other, which can realize the simultaneous quenching and straightening of multiple guide rails, and can greatly improve the working efficiency of guide rail hot working.

[0039] Optionally, the plurality of clamping members 10 includes a first clamping member 101, wherein the locking hole 14 of the first clamping member 101 is partly countersunk and partly straight, with the straight holes and countersunk holes distributed at intervals.

[0040] refer to Figure 1 and Figure 3 In this embodiment, bolts and nuts are used to fix multiple clamping components 10 (the bolts and nuts are not shown in the figure). A portion of the locking hole 14 of the first clamping component 101 is set as a countersunk hole. The countersunk hole surface forms a self-centering fit with the bolt head, effectively eliminating the accumulated assembly errors of traditional planar contact. This is particularly suitable for the axial alignment requirements when multiple clamping components 10 are stacked, improving assembly positioning accuracy. The remaining locking holes 14 are set as straight holes. Compared to countersunk holes, straight holes maintain the complete wall thickness of the first clamping component 101, possessing inherent structural strength advantages and better enhancing the fixing strength between the clamping components 10. The alternating distribution of straight holes and countersunk holes balances the assembly positioning accuracy and the fixing strength between the clamping components 10, thereby better achieving the constraint and fixation of multiple clamping components 10.

[0041] It is worth noting that since the temperature of the guide rail during the quenching process can reach 300-500℃, under this high temperature condition, the heat conduction is more uniform due to the weakening of the straight hole cross section. The preload reduction rate of the straight hole connecting bolt is about half that of the countersunk hole connecting bolt. Therefore, the thermal stability of the straight hole structure is better than that of the countersunk hole.

[0042] In addition, the countersunk hole structure allows the bolt head to be completely hidden, reducing the overall assembly height and providing a more compact axial space layout for the multi-clamping 10-stack design.

[0043] Optionally, the straight hole on the first clamping member 101 and the countersunk hole adjacent to the straight hole constitute a hole group. The first clamping member 101 has multiple hole groups, which are symmetrically distributed on both sides of the receiving groove 12.

[0044] The symmetrical distribution of this type of hole group can apply equal and symmetrical straightening forces to the quenched guide rail simultaneously, effectively eliminating the torsional deformation caused by unilateral force application and ensuring that the guide rail maintains optimal straightness during the straightening process.

[0045] Reference Figure 1 The first clamping member 101 has a hole group consisting of two countersunk holes and one straight hole, wherein the two countersunk holes are symmetrically distributed relative to the straight hole. The first clamping member 101 has eight hole groups, which are symmetrically distributed on both sides of the receiving groove 12 and are symmetrical about the left and right along the length direction of the guide rail quenching fixture 100.

[0046] Optionally, the locking holes 14 of the first clamping member 101 are all countersunk holes.

[0047] Optionally, the locking holes 14 of the first clamping member 101 are all straight holes.

[0048] Optionally, the plurality of clamping members 10 includes a second clamping member 102, and the locking holes 14 on both sides of the second clamping member 102 are all formed with straight holes.

[0049] Similarly, the locking holes 14 on both sides of the second clamping member 102 are designed with straight holes, which can further utilize the structural strength and thermal stability advantages of straight holes to enhance the fixing strength between the clamping members 10.

[0050] In this embodiment, the locking holes 14 of the second clamping member 102 are all straight holes, which cooperate with the countersunk holes / straight holes of the first clamping member 101.

[0051] Of course, in other embodiments of this utility model, the locking hole 14 of the second clamping member 102 may also be a countersunk hole. Alternatively, the first clamping member 101 and the second clamping member 102 may have the same structure, that is, the locking holes 14 of the first clamping member 101 and the second clamping member 102 may correspond to each other.

[0052] It is easy to understand that the height of a single receiving groove 12 corresponds to half the height of the guide rail to be quenched, that is, the height of the guide rail to be quenched corresponds to the height of the guide rail straightening groove 13; the width of the guide rail to be quenched corresponds to the width of the receiving groove 12, that is, the width of the guide rail to be quenched corresponds to the width of the guide rail straightening groove 13.

[0053] Optionally, the plurality of receiving slots 12 have a first inner wall 121, the width D1 of the first inner wall 121 satisfying: D1=W+Δ, where W is the standard width of the guide rail to be clamped, Δ is the width compensation amount, and 0.15cm≤Δ≤0.4cm.

[0054] Reference Figure 5 Because the guide rail undergoes a solid-state phase transformation from austenite (γ-Fe) to martensite (α'-Fe) during quenching, the resulting volume expansion directly affects the dimensional accuracy and residual stress distribution of the guide rail. To effectively address the dimensional changes caused by thermal expansion during quenching, the guide rail quenching fixture 100 in this embodiment employs an expansion compensation design. In this embodiment, the quenched guide rail is a U-shaped guide rail with a length of 2m, a width of 26mm, and a height of 8mm. This expansion compensation design not only reduces the risk of workpiece deformation but also improves the dimensional accuracy and workpiece quality after quenching. The width compensation amount Δ ranges from 0.15cm ≤ Δ ≤ 0.4cm.

[0055] Preferably, the width compensation amount Δ = 0.2 cm.

[0056] Similarly, refer to Figure 5 In the height direction of the guide rail, multiple receiving slots 12 have relatively arranged second inner walls 123. The height D2 of the second inner wall 123 satisfies: D2=Y+δ, where Y is the standard height of the guide rail to be clamped, δ is the height compensation amount, and 0.05cm≤δ≤1.5cm.

[0057] Preferably, the height compensation amount δ = 0.1 cm.

[0058] The working principle of the guide rail quenching fixture 100 provided in this embodiment is as follows:

[0059] The guide rail workpiece is placed into the guide rail quenching fixture 100 at an austenitic temperature. After multiple clamping members 10 are used to constrain and fix the workpiece, the assembled guide rail quenching fixture 100 is immersed in the quenching liquid, and the guide rail completes the austenitic to martensite phase transformation process. During the phase transformation, due to the circumferential constraint of the guide rail quenching fixture 100, the guide rail workpiece experiences relatively uniform stress and low pressure during quenching, making it less prone to localized damage or even cracking. The guide rail quenching fixture 100 features a simple, stable, and reliable structure, preventing free deformation and localized damage to the guide rail workpiece during quenching.

[0060] In addition, the guide rail quenching fixture 100 in this embodiment adopts an expansion compensation design. On the one hand, it can effectively cope with the dimensional changes of the workpiece caused by thermal expansion during the quenching process. On the other hand, the structural design optimizes the flow path of the quenching medium, ensuring that the quenching liquid can fully and evenly contact the surface of the guide rail workpiece, thereby improving the cooling uniformity, reducing structural stress and thermal deformation, and ultimately ensuring the quenching hardness and dimensional accuracy of the guide rail.

[0061] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A guide rail quenching fixture (100), characterized in that, include: Multiple clamping members (10) are provided, each clamping member (10) having a receiving groove (12) along its length. The multiple clamping members (10) are arranged opposite to each other, such that the receiving grooves (12) of two opposite clamping members (10) are matched to form a guide rail straightening groove (13). Multiple locking holes (14) are provided through both sides of the clamping members (10). Multiple fixing members are also provided, which are matched with the multiple locking holes (14) to constrain and fix the multiple clamping members (10).

2. The guide rail quenching fixture (100) according to claim 1, characterized in that, The plurality of clamping members (10) includes a first clamping member (101), and the receiving groove (12) is formed on two opposite sides of each clamping member (10) along the length direction.

3. The guide rail quenching fixture (100) according to claim 2, characterized in that, The locking hole (14) of the first clamping member (101) is partly countersunk and partly straight, with the straight holes and the countersunk holes distributed at intervals.

4. The guide rail quenching fixture (100) according to claim 3, characterized in that, The straight hole on the first clamping member (101) and the countersunk hole adjacent to the straight hole constitute a hole group. The first clamping member (101) has multiple hole groups, which are symmetrically distributed on both sides of the receiving groove (12).

5. The guide rail quenching fixture (100) according to claim 2, characterized in that, The locking holes (14) of the first clamping member (101) are all countersunk holes.

6. The guide rail quenching fixture (100) according to claim 2, characterized in that, The locking holes (14) of the first clamping member (101) are all straight holes.

7. The guide rail quenching fixture (100) according to claim 1, characterized in that, The plurality of clamping members (10) includes a second clamping member (102), and the locking holes (14) on both sides of the second clamping member (102) are all formed with straight holes.

8. The guide rail quenching fixture (100) according to claim 1, characterized in that, The receiving groove (12) has a first inner wall (121), the width D1 of the first inner wall (121) satisfies: D1=W+Δ, where W is the standard width of the guide rail to be clamped, Δ is the width compensation amount, and 0.15cm≤Δ≤0.4cm.

9. The guide rail quenching fixture (100) according to claim 8, characterized in that, Δ = 0.2cm.

10. The guide rail quenching fixture (100) according to claim 1, characterized in that, The receiving groove (12) has a second inner wall (123) arranged opposite to it. The height D2 of the second inner wall (123) satisfies: D2=Y+δ, where Y is the standard height of the guide rail to be clamped, δ is the height compensation amount, and 0.05cm≤δ≤1.5cm.

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