Heat treatment device for multi-lug flat plate type workpieces

Abstract

The utility model discloses a heat treatment device for a multi-lug flat plate type workpiece, which comprises an eccentric hook and pull rods, the eccentric hook is provided with a hanging hole, the upper part of the inner edge of the hanging hole is provided with a narrowed notch, the eccentric hook is hinged with the two pull rods, the lower parts of the two pull rods are fixed with connecting holes on lug plates, and the two pull rods are fixed with the connecting holes on the lug plates. During work, a plurality of pull rods are opened by a certain angle according to distribution of lug plate connecting holes of parts, bolts penetrate through the connecting holes, the pull rods and the flower-shaped spacer bushes, then the upper portions of the pull rods are hinged to the eccentric hook, and after the bolts are fastened, the pull rods and the flower-shaped spacer bushes are connected through the pull rods and the flower-shaped spacer bushes. And the assembled whole is hung to a heat treatment hook, the hook penetrates through the upper hanging hole and is not fixed to the notch, whole shaking is reduced, and finally part quenching treatment is conducted.

Description

Technical Field

[0001] The utility model relates to the technical field of heat treatment tooling for metal parts, and more specifically, to a heat treatment device for multi-ear flat-plate parts. Background Art

[0002] Heat treatment of metal parts is to place the metal parts in a heating device, heat them to a specific temperature, keep them warm for a specific time, and then cool them down to change the internal structure of the metal, so as to improve the mechanical, physical and chemical properties of the material. During the heat treatment process, the specific volume changes due to the transformation of the structure, causing volume expansion. At the same time, due to the change in the way the parts are quenched and transferred into the oil, they shake and cannot be put into the oil vertically, resulting in inconsistent cooling states of various parts of the parts, which ultimately leads to serious deformation of important parts of the metal parts, affecting the finishing dimensions of the parts after heat treatment.

[0003] During the heat treatment and quenching process of multi-ear plate-shaped parts, the traditional hanging method is to tie and hang with stainless steel wire. The operator cannot ensure that the flat parts of the multi-ear plate-shaped parts are hung vertically, and the steel wire becomes soft after the parts are heated, and the parts tilt more seriously. During the quenching process, it is impossible to ensure that the flat parts are vertically oiled, which greatly causes the flatness of the flat plate of the parts to exceed the tolerance of 1-2mm after heating. After heat treatment, the spatial dimensions of the ear pieces of the parts and the parallelism of the flat parts are seriously exceeded. After heating, the flat parts need to be corrected. There is great difficulty in correcting multi-ear plate-shaped parts. Therefore, the core issue of heat treatment of plate-shaped multi-ear parts is to control the hanging method of the parts. It is very important to design a reasonable hanging tooling. Utility Model Content

[0004] In response to the above defects or improvement needs of the prior art, the utility model provides a heat treatment device for multi-ear flat-plate workpieces, which can prevent the parts from shaking during the hanging heat treatment process, so that the heat treatment process of multi-ear flat-plate asymmetric parts can achieve vertical hanging of the flat parts and vertical entry into the quenching oil surface, thereby reducing the deformation size of the parts after heating.

[0005] In order to achieve the above-mentioned purpose, according to the utility model, a heat treatment device for multi-ear flat plate-type workpieces is provided, including an eccentric hook and a pull rod, the eccentric hook is provided with a hanging hole, and a narrowed notch is provided on the upper inner edge of the hanging hole, two pull rods are hinged on the eccentric hook, and the lower parts of the two pull rods are fixed to the connecting holes on the ear plate, the side of the eccentric hook protrudes outward to form a directional boss, and a flower-shaped spacer is provided between adjacent ear plates.

[0006] During operation, multiple pull rods are opened at a certain angle according to the distribution of the ear plate connection holes of the parts, and bolts are used to pass through the connection holes, pull rods and flower-shaped spacers. The upper part of the pull rods is then hinged to the eccentric hook. After tightening the bolts, the entire assembly is hung on the heat treatment hook. The hook passes through the upper hanging hole and is not fixed at the notch position to reduce overall shaking, and finally the parts are quenched.

[0007] Furthermore, the eccentric hook is provided with a horizontal hinge portion, and the hinge portion is hinged to the pull rod.

[0008] Furthermore, a first connecting hole and a second connecting hole are provided at both ends of the pull rod, the first connecting hole is hinged to the hinge part, and the second connecting hole is fixed to the connecting hole on the ear plate. The two pull rods can be easily opened to an angle and installed to adapt to the parts, which is convenient and quick to use.

[0009] Furthermore, fixing holes are provided at both ends of the hinged portion, and a steel wire or a pin is passed through the fixing holes to prevent the pull rod from slipping, thereby preventing the pull rod and the hinged portion from shaking and slipping.

[0010] Furthermore, the second connecting hole, the hanging ear connecting hole and the flower-shaped spacer are fixed by upper core shaft bolts or hollow bolts. The use of hollow bolts can reduce the influence of the bolt's own weight on the overall center of gravity when the diameter of the connecting hole is large.

[0011] Furthermore, the flower-shaped spacer is a cylindrical structure with guide grooves provided at both ends thereof. The guide grooves are evenly distributed around the circumference of the flower-shaped spacer at both ends for passing oil, ensuring that the oil flows between adjacent hanging lugs during quenching.

[0012] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0013] (1) The utility model provides a heat treatment device for multi-ear flat plate-like parts, in which two pull rods are staggered and hinged at the bottom of an eccentric hook, and the ends of the pull rods are respectively fastened to the connecting holes on the top of the multi-ear flat plate-like parts. The length of the pull rods ensures that the vertical line of the eccentric hook downward passes through the center of gravity of the assembly. A hanging hole is provided on the eccentric hook, and a narrowed notch is provided on the inner edge of the upper contour of the hanging hole to prevent the parts from shaking during the hanging heat treatment process, so that the multi-ear flat plate asymmetric parts can be vertically hung and vertically inserted into the quenching oil surface during the heat treatment process, which can reduce the deformation size of the parts after heating. This technical solution can effectively reduce the labor intensity of the parts heat treatment clamping.

[0014] (2) The utility model provides a heat treatment device for multi-ear flat plate-type workpieces, which reduces the deformation of parts and can effectively reduce the mechanical processing of typical workpieces after heat treatment. The machining allowances of inner holes and non-precise matching size parts before heat treatment are reduced or no allowance is left, which greatly improves the processing efficiency of parts and reduces the tool wear rate.

[0015] (3) The utility model provides a heat treatment device for multi-ear flat plate-like workpieces, in which a patterned spacer is provided at the top connecting hole and other through holes of the multi-ear flat plate-like workpiece, and a guide groove is provided on the patterned spacer as an oil passage. At the same time, the patterned spacer is provided between adjacent ear pieces to reduce the size change of the opening or shrinking thereof.

[0016] (4) The utility model provides a heat treatment device for multi-ear flat plate-type workpieces. By designing a device for hanging ear flat plate-type workpieces, the preparation time for heat treatment processing of metal workpieces can be greatly reduced, the effective space of the heating equipment can be fully utilized, and a direction boss is set on the eccentric hook to indicate the direction, which can facilitate positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the hoisting of a heat treatment device for multi-ear flat plate parts according to the embodiment of the utility model. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the hoisting of a heat treatment device for multi-ear flat plate parts according to the embodiment of the utility model. Figure 2 ;

[0019] Figure 3 This is a front view and an axonometric view of a central eccentric hook of a multi-ear flat plate workpiece heat treatment device according to an embodiment of the present utility model;

[0020] Figure 4 This is a front view and an axonometric view of a tie rod in a heat treatment device for multi-ear flat plate-type workpieces according to an embodiment of the present utility model;

[0021] Figure 5 This is a schematic diagram of the size design of a heat treatment device for multi-ear flat plate parts according to an embodiment of the utility model;

[0022] Figure 6 This is a front view and an axonometric view of a flower-shaped spacer sleeve 1 in a heat treatment device for multi-ear flat plate-type workpieces according to an embodiment of the present invention;

[0023] Figure 7 This is a front view and an axonometric view of a second flower-shaped spacer in a heat treatment device for multi-ear flat plate-type workpieces according to an embodiment of the present invention;

[0024] Figure 8 The front view and side view of a core shaft bolt in a heat treatment device for multi-ear flat plate-type workpieces according to an embodiment of the utility model;

[0025] Figure 9 This is a side view of a hollow bolt in a heat treatment device for multi-ear flat plate-type workpieces according to an embodiment of the present invention.

[0026] In all the drawings, the same figure marks represent the same technical features, specifically: 1. Eccentric hook; 2. Pull rod; 3. Nut; 5. First core shaft bolt; 6. Hollow bolt; 7. Flower-shaped spacer; 9. Second core shaft bolt; 11. Direction boss; 12. Fixing hole; 13. Hinge; 14. Hanging hole; 21. First connecting hole; 22. Second connecting hole; 71. Guide groove. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0028] like Figure 1-Figure 4 As shown, this embodiment provides a heat treatment device for multi-ear flat plate-shaped parts, including an eccentric hook 1, a pull rod 2, a flower-shaped spacer 7, a nut 3, a core shaft bolt 5 and a hollow bolt 6. The eccentric hook 1 is provided with a hanging hole 14. When the eccentric hook 1 is in a vertical hanging state, a narrowed notch is provided on the inner edge of the upper contour of the hanging hole 14. Preferably, the notch is in an inverted "V" shape. The hanging hole 14 can effectively prevent the parts from shaking during the heat treatment hanging process, effectively ensuring the stable hanging of the parts. Furthermore, the two sides of the bottom of the eccentric hook 1 are respectively hinged with pull rods 2, and the two pull rods 2 are opened at a certain angle. The ends of the two pull rods 2 are respectively connected and fixed to the connection holes on the multi-ear plate-shaped parts through core shaft bolts or hollow bolts 6.

[0029] Furthermore, if Figure 1-Figure 4As shown, the eccentric hook 1 is determined according to the center of gravity position of the part, the hanging height, and the hanging weight. The eccentric hook 1 is designed with an effective hinge part 13 according to the weight of the part. The hinge part 13 is a cylindrical structure and is horizontally fixed to the bottom of the eccentric hook 1. Preferably, the hinge part 13 extends about 5mm from the bottom of the eccentric hook 1 on each side while ensuring the minimum length. Furthermore, since the center of gravity position of some multi-ear plate-shaped parts is not in the middle, there is a situation of excessive deviation. For this situation, it is necessary to add a direction boss 11 to the eccentric hook 1 to prevent errors during the assembly process of the device. The direction boss 11 is an integrated structure protruding outward from the eccentric hook 1. Furthermore, in order to facilitate fastening and prevent the pull rod 2 from slipping, a fixing hole 12 is designed at each end of the extension of the hinge part 13. A steel wire or a pin is passed through the fixing hole 12 to prevent the pull rod 2 from slipping from the end of the hinge part 13 when it moves.

[0030] Furthermore, if Figure 1-Figure 5 As shown, a first connecting hole 21 and a second connecting hole 22 are provided at both ends of the pull rod 2, wherein the first connecting hole 21 is used to connect with the eccentric hook 1, and the second connecting hole 22 is fixed with the connecting hole on the multi-ear plate-shaped part. Assume that the distance between the connecting holes on the two pull rods 2 is the length of line segment B and line segment C respectively, and the center distance between the two second connecting holes 22 on the two pull rods 2 is A. Figure 3 and Figure 4 As shown, the length of the pull rod 2 is determined according to the parallel relative position relationship of the hanging ears of the parts, and the centers of the hanging holes 14 and the two second connecting holes 22 are connected in sequence to form a triangle. The distance between the centers of the hanging holes 14 and the two second connecting holes 22 is the length of line segment B and line segment C respectively, and the distance between the centers of the two second connecting holes 22 is the length of line segment A, that is, the distance between the centers of the left and right hanging ears on the multi-ear plate-shaped workpiece is the length of line segment A, and the length of line segment A is a known fixed distance. When line segment A is horizontal, a vertical line segment is drawn through the hanging hole 14 to intersect with line segment A. The intersection separates A into two line segments of known length, namely A1 and A2, and the length of the vertical line segment is H. The lengths of A1, A2 and H are known, and the lengths of the hypotenuse line segment B and line segment C in the two right triangles are calculated respectively by the Pythagorean theorem to obtain the lengths of the two pull rods 2. Furthermore, by determining the size of the pull rod 2 through this method, the complex three-dimensional spatial stress to which the device is subjected during the hanging process can be effectively simplified into one-dimensional tensile stress. By simplifying the complex multiple stresses, the service life of the device can be effectively improved, the difficulty of processing and clamping can be reduced, the manufacturing cost can be saved, the deformation of the fixture during repeated heat treatment processes can be reduced, and the reliability can be improved.

[0031] Preferably, the clearance fit of the hinged portion 13 of the first connecting hole 21 on the two pull rods 2 meets the requirement of 0.2-0.4mm, and the clearance fit of the core shaft bolt or hollow bolt 6 and the hanging ear connecting hole and the second connecting hole 22 meets the requirement of 0.2-0.4mm. This range can effectively ensure the repeated service life of the clamp and the positioning accuracy deviation caused by calculation and manufacturing errors, and can effectively ensure the reliability and practicality of the clamp.

[0032] Furthermore, if Figures 1-8 As shown, the fastening structure of this device and the hanging ear piece adopts a bolt fixing method. Specifically, a first core shaft bolt 5 and a hollow bolt 6 are respectively passed through the connecting holes on the two hanging ear pieces. The ends of the first core shaft bolt 5 and the hollow bolt 6 are fixed by nuts 3. Furthermore, a second core shaft bolt 9 is passed through the bottom through hole of the multi-ear plate-shaped workpiece and fixed with nuts 3. If the through holes and connecting holes of the multi-ear plate-shaped workpiece have large diameters, the first core shaft bolt 5 and the second core shaft bolt 9 can be used in conjunction with the hollow bolt 6 to reduce the overall weight. Furthermore, the thread length L of the first core shaft bolt 5 is usually increased by about 3mm from the minimum length that can be used. This design method can effectively avoid the imbalance of the center of gravity at both ends due to excessively long bolts, and can effectively improve the consistency of the center of gravity position after the parts and fixtures are assembled.

[0033] Preferably, the bolted fastening method utilizes a coarse thread connection, with the thread pitch designed in accordance with the standard GB / T196, "Basic Dimensions of Common Threads," which requires a standard thread with a pitch equal to the maximum pitch size corresponding to the nominal diameter. This thread standardization improves on-site thread versatility, ensuring that the nuts 3 used in the heat treatment fixture are all standard nuts. Selecting the maximum thread pitch effectively increases the service life of the thread structure during repeated heat treatments, resulting in the fixture having low maintenance costs and a long service life.

[0034] Furthermore, if Figure 1 、 Figure 6 and Figure 7As shown, a flower-shaped spacer 7 is further provided at the bolt connection between the device and the multi-ear plate-shaped workpiece. The flower-shaped spacer 7 is arranged between a plurality of coaxial connection holes on the multi-ear plate-shaped workpiece, and is fixed by passing through the first core shaft bolt 5, the second core shaft bolt 9 or the hollow bolt 6. The flower-shaped spacer 7 is a cylindrical structure, and a guide groove 71 is provided at both ends thereof. The guide groove 71 is evenly distributed around the axis circumference at the two end edges of the flower-shaped spacer 7 to form evenly distributed notches. The guide groove 71 is used for oil circulation to ensure the circulation of oil when the hanging ear piece is quenched. After quenching is completed, it is also used for the circulation and cleaning of the quenching liquid on the flower-shaped spacer 7 and the above-mentioned bolts. Furthermore, by arranging the flower-shaped spacer 7, the adjacent ears at the hanging ear part can be effectively prevented from opening or shrinking in size during the heat treatment quenching process. Furthermore, by determining the center of gravity of the multi-ear plate-shaped workpiece and the device, a special eccentric hook 1 is designed to ensure that the deformable plane of the multi-ear plate-shaped workpiece during high-temperature heating and quenching oil is vertically oiled, reducing the degree of uneven internal stress caused by the inclined oiling during the plane quenching process, and effectively reducing the plane deformation of the quenched parts.

[0035] Preferably, the clearance fit between the flower-shaped spacer 7 and the above-mentioned bolt is controlled between 1-2 mm. This fit can effectively ensure the coaxiality of the hanging ear piece, and improve the transfer efficiency and repeated service life of the device. It will not cause carbon deposition and adhesion due to the lack of circulation of quenching liquid, causing the device to be scrapped or repaired.

[0036] Furthermore, the operation process of using the device to fix multiple ear plate-shaped parts for quenching is as follows: clamp the flower-shaped spacer 7 between the adjacent ear parts of the part, and then select the first core shaft bolt 5, the second core shaft bolt 9 or the hollow bolt 6 to pass through the connecting hole on the ear and the flower-shaped spacer 7, and at the same time pass through the second connecting hole 22 at the end of the pull rod 2. When the above-mentioned bolts are passed through to connect multiple pull rods 2, the direction of the eccentric hook 1 is determined according to the direction boss 11, so that one of the pull rods 2 matches the corresponding connecting hole, and then the pull rod 2 is tightened. The first connecting hole 21 is sleeved on the end of the hinge 13. A stainless steel wire is passed through the fixing hole 12 at the end of the hinge 13 to prevent the pull rod 2 from slipping off the hinge 13. According to the above method, the two ends of the second pull rod 2 are respectively connected to the hanging ear of the part and the eccentric hook 1. After the two pull rods 2 of the device are assembled with the upper connecting hole of the part, the distance between the first core shaft bolt 5, the second core shaft bolt 9 or the hollow bolt 6 is adjusted, and the nut 3 is tightened to ensure that the part is fully fixed to the device and prevent deformation of the part during quenching. Further, the lower ear of the part is assembled, and the flower-shaped spacer 7 is placed between the adjacent ears. The second core shaft bolt 9 is assembled through the part ear and the flower-shaped spacer 7. Finally, the nut 3 is used to secure the second core shaft bolt 9. Finally, the assembly is finally hung, and a universal S-shaped hook is used to pass through the hanging hole 14 on the eccentric hook 1 to complete the final hanging process of the part.

[0037] Preferably, the main load-bearing components of the eccentric hook 1 and the pull rod 2 should be regularly subjected to magnetic particle inspection, and if cracks are found, they need to be scrapped.

[0038] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A heat treatment device for multi-ear flat plate parts, characterized in that: It comprises an eccentric hook (1) and a pull rod (2), wherein the eccentric hook (1) is provided with a hanging hole (14), and a narrowed notch is provided on the upper inner edge of the hanging hole (14); two pull rods (2) are hinged on the eccentric hook (1), and the lower parts of the two pull rods (2) are fixed to the connecting holes on the ear plates; the side of the eccentric hook (1) protrudes outward to form a direction boss (11), and a flower-shaped spacer (7) is provided between adjacent ear plates.

2. The heat treatment device for multi-ear flat plate workpieces according to claim 1, characterized in that: The eccentric hook (1) is provided with a horizontal hinge portion (13), and the hinge portion (13) is hinged to the pull rod (2).

3. The heat treatment device for multi-ear flat plate workpieces according to claim 2, characterized in that: A first connecting hole (21) and a second connecting hole (22) are provided at both ends of the pull rod (2); the first connecting hole (21) is hinged to the hinge portion (13), and the second connecting hole (22) is fixed to the connecting hole on the ear plate.

4. The heat treatment device for multi-ear flat plate workpieces according to claim 3, characterized in that: Fixing holes (12) are provided at both ends of the hinged portion (13), and a steel wire or a bolt is passed through the fixing holes (12) to prevent the pull rod (2) from slipping off.

5. The heat treatment device for multi-ear flat plate workpieces according to claim 3, characterized in that: The second connecting hole (22), the hanging ear connecting hole and the flower-shaped spacer (7) are fixed by an upper core shaft bolt or a hollow bolt (6).

6. A heat treatment device for multi-ear flat plate workpieces according to any one of claims 1 to 5, characterized in that: The flower-shaped spacer (7) is a cylindrical structure, with guide grooves (71) provided at both ends thereof, and the guide grooves (71) are evenly distributed around the two ends of the flower-shaped spacer (7).

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