Method and device for judging torsional strength of double-end stud with lock key and medium

Abstract

The invention discloses a method and device for judging the torsional strength of a double-end stud with a lock key and a medium, and the method comprises the steps: obtaining design parameters of the double-end stud with the lock key in response to a received judgment instruction; determining the tensile strength of the double-end stud with the locking key according to the material mark and the material standard; calculating shear strength according to the tensile strength; according to the shearing strength, the width of the locking key, the thread outer diameter of the stud screwed into the cartridge receiver, the shearing length of the locking key and the number of the locking key, the torsional strength design value of the double-end stud with the locking key is obtained through calculation; comparing the torsional strength design value of the double-end stud with the lock key with a corresponding standard value; and in response to the condition that the torsional strength design value is greater than or equal to the corresponding standard value, generating design qualification prompt information. The auxiliary design of the double-end stud with the lock key can be realized, and the design qualification rate and the design speed of the double-end stud with the lock key are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of stud-assisted design, and in particular relates to a method, a device and a medium for judging the torsional strength of a stud with a lock key. Background Art

[0002] The studs with lock keys are often used to connect the gas generator casing of turboshaft engines. In actual use, the studs have a high damage rate and large consumption, which greatly restricts the maintenance and support of this type of engine. Failure of the studs, such as breakage or loosening, will affect the connection rigidity of the turboshaft engine. In severe cases, it will affect the balance of the engine rotor and cause damage to engine parts.

[0003] Currently, after the design of a double-ended stud with a lock key is completed, its torsional strength can only be determined through experimental testing, which is time-consuming and labor-intensive. In addition, due to the influence of test equipment, test methods, test personnel, test sample size, etc., if the test fails, it is necessary to return to modify and debug the designed double-ended stud with a lock key, which makes the design time-consuming. Summary of the invention

[0004] In order to solve the problem that the torsional strength of existing studs with lock keys is obtained by experimental testing, which leads to time-consuming design and testing, the present invention proposes a method, device and medium for judging the torsional strength of studs with lock keys, which can realize the auxiliary design of studs with lock keys and improve the design qualification rate and design speed of studs with lock keys.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] The first aspect of the present invention discloses a method for determining the torsional strength of a stud with a lock key, comprising:

[0007] In response to receiving a judgment instruction, obtaining design parameters of the stud with a lock key, wherein the design parameters include the material grade and material standard corresponding to the stud with a lock key, the lock key width, the outer diameter of the stud thread screwed into the receiver end, the shear length of the lock key, and the number of lock keys;

[0008] Determine the tensile strength of the stud with lock key according to the material grade and material standard;

[0009] Calculate the shear strength according to the tensile strength;

[0010] The torsional strength design value of the double-ended stud with a lock key is calculated according to the shear strength, the lock key width, the outer diameter of the thread of the stud screwed into the casing end, the shear length of the lock key, and the number of lock keys;

[0011] Compare the design value of the torsional strength of the keyed stud with the corresponding standard value;

[0012] In response to the torsional strength design value being greater than or equal to the corresponding standard value, a design qualification prompt message is generated.

[0013] The second aspect of the present invention discloses a device for judging the torsional strength of a stud with a locking key, comprising a memory and a controller which are communicatively connected in sequence, wherein a computer program is stored in the memory, and the controller is used to read the computer program and execute the method for judging the torsional strength of a stud with a locking key described in the first aspect.

[0014] A third aspect of the present invention discloses a computer-readable storage medium having instructions stored thereon. When the instructions are run on a computer, the method for determining the torsional strength of a double-headed stud with a lock key described in the first aspect is executed.

[0015] The beneficial effects of the present invention are:

[0016] The invention can realize the auxiliary design of the stud with a lock key, and improve the design qualification rate and design speed of the stud with a lock key. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of a double-headed stud structure with a lock key of the present invention;

[0019] Figure 2 for Figure 1 AA section view. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] 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 invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The first aspect of the present invention discloses a method for judging the torsional strength of a stud with a lock key. The method can be, but is not limited to, performed by a device for judging the torsional strength of a stud with a lock key. The device for judging the torsional strength of a stud with a lock key can be software, or a combination of software and hardware. The point cloud thermal map drawing device can be integrated in smart mobile terminals, tablets, computers and other smart devices. Specifically, the method for judging the torsional strength of a stud with a lock key includes the following steps S01 to S06. It should be noted that the step identification in this scheme is only for the convenience of explaining the method, and does not constitute a limitation on the order of precedence. The order of the steps is based on their language descriptions and the order of the signals.

[0027] Step S01, in response to receiving a judgment instruction, obtaining design parameters of a stud with a lock key, wherein the design parameters include a material grade and material standard corresponding to the stud with a lock key, a lock key width, an outer diameter of a stud thread screwed into a casing end, a shear length of the lock key, and a number of lock keys.

[0028] The designed double-headed stud with lock key structure is as follows Figure 1 , 2 As shown, it includes a stud and a lock key 2 for realizing rotation locking of the stud. The stud includes a first stud section 11 and a second stud section 12 which is coaxial with the first stud section 11 and has a larger diameter than the first stud section 11. The second stud section 12 is provided with two groove structures 13 respectively disposed at both ends of the diameter of the second stud section 12; the lock key 2 is disposed in the groove structure 13. Among them, the outer diameter of the thread of the stud screwed into the receiver end is the outer diameter of the second stud section 12.

[0029] After completing the design, the designer clicks the torsional strength judgment button. At this time, the torsional strength judgment device for the stud with lock key receives the judgment instruction and obtains the design parameters of the stud with lock key from the design drawing of the stud with lock key.

[0030] In order to improve the accuracy of torsional strength judgment, the shear length of the lock key does not include the chamfer dimension.

[0031] Step S02: determining the tensile strength of the stud with lock key according to the material grade and material standard.

[0032] The design drawing of the double-ended stud with lock key has its corresponding material brand and material standard, and the corresponding tensile strength can be determined by looking up the material brand and material standard.

[0033] Step S03: Calculate the shear strength according to the tensile strength.

[0034] Specifically, the shear strength P of the double-headed stud with lock key 2 =0.5P 1 ,

[0035] Where P 2 is the shear strength, in MPa; P 1 It is the tensile strength, the unit is MPa.

[0036] Step S04, calculating the torsional strength design value of the double-ended stud with a lock key according to the shear strength, lock key width, outer diameter of the thread of the stud screwed into the casing end, shear length of the lock key, and number of lock keys.

[0037] Specifically, the torsional strength design value of the stud with lock key is:

[0038] T=(P 2 VdKL) / (2*1000),

[0039] In the formula, T is the design value of torsional strength, in Nm; V is the number of lock keys, in pieces; d is the outer diameter of the thread, in mm; K is the lock key width, in mm; L is the shear length of the lock key, in mm.

[0040] Step S05: comparing the design value of the torsional strength of the stud with a locking key with the corresponding standard value.

[0041] Step S06: In response to the torsional strength design value being greater than or equal to the corresponding standard value, generating a design qualified prompt message; or, in response to the torsional strength design value being less than the corresponding standard value, generating a design unqualified prompt message.

[0042] Through the above method, the torsional strength design value of the stud with lock key involved is directly calculated through the material grade and material standard, lock key width, outer diameter of the stud thread screwed into the casing end, shear length of the lock key, and the number of lock keys. It can be compared with the corresponding standard value to determine whether the design meets the requirements. If it meets the requirements, prompt information is generated in time, and the designer can further modify the design drawings without the need for experimental testing, thereby improving design efficiency and solving the problems of time-consuming design and testing.

[0043] In order to facilitate the understanding of this solution and reflect the technical advantages of this solution, the following are illustrative examples:

[0044] The designers designed a double-ended stud with a locking key. Its material grade is Inconel 718, the material standard is AMS 5662, the strength grade is 1275MPa, the thread screwed into the screw at the nut end is based on the standard AS 8879, and the accuracy is 3A; the thread screwed into the screw at the receiver end is based on the standard FED-STD-H28 / 2, and the outer diameter specifications of the threads at both ends of the screw are (unit: in): 0.1900-32, 0.3125-24; 0.1900-32, 0.2500-28.

[0045] According to the above method, two double-ended studs with locking keys are designed, and their design parameters are shown in Table 1.

[0046] Table 1

[0047]

[0048] Using the above method, the torsional strength design value of the first group is 10.65, and the torsional strength design value of the second group is 8.52. It should be noted that the unit of d here is mm, so it needs to be converted from imperial to metric. The "-" before the table represents the outer diameter of the thread, and the imperial system needs to be converted to the metric system. For example, 0.3125in = 0.3125*25.4mm; the "-" after represents the number of threads per inch.

[0049] Three parts were randomly selected from actual production to measure their torsional strength. The measured results are shown in Table 2.

[0050] Table 2

[0051]

[0052] It can be seen that the designs of the two studs with lock keys meet the requirements. The first batch of newly produced studs were installed and tested for 1,800 hours. After disassembly and inspection, no faults were found, indicating that the calculation method of the torsional strength design value of the studs is reasonable and can be used to calculate the torsional strength design value of similar parts.

[0053] The second aspect of the present invention discloses a device for judging the torsional strength of a stud with a lock key, comprising a memory and a controller connected in sequence, wherein a computer program is stored in the memory, and the controller is used to read the computer program and execute a method for judging the torsional strength of a stud with a lock key described in the second aspect. Specifically, the memory may include, but is not limited to, a random access memory (RAM), a read-only memory (ROM), a flash memory (Flash Memory), a first-in-first-out memory (FIFO) and a first-in-last-out memory (FILO), etc.; the controller may not be limited to a microcontroller of the STM32F105 series. In addition, the computer device may also include, but is not limited to, a power supply unit, a display screen and other necessary components.

[0054] A third aspect of the present invention is a computer-readable storage medium having instructions stored thereon. When the instructions are run on a computer, a method for determining the torsional strength of a double-headed stud with a lock key described in the first aspect and any possible design thereof is executed.

[0055] The operating principles of the devices and systems disclosed in the second and third aspects of the present invention are detailed in the first aspect and will not be elaborated here.

[0056] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A method for judging the torsional strength of a double-ended stud with a lock key, characterized in that: include: In response to receiving a judgment instruction, obtaining design parameters of the stud with a lock key, wherein the design parameters include the material grade and material standard corresponding to the stud with a lock key, the lock key width, the outer diameter of the stud thread screwed into the receiver end, the shear length of the lock key, and the number of lock keys; Determine the tensile strength of the stud with lock key according to the material grade and material standard; Calculate the shear strength according to the tensile strength; The torsional strength design value of the double-ended stud with a lock key is calculated according to the shear strength, the lock key width, the outer diameter of the thread of the stud screwed into the casing end, the shear length of the lock key, and the number of lock keys; Compare the design value of the torsional strength of the keyed stud with the corresponding standard value; In response to the torsional strength design value being greater than or equal to the corresponding standard value, a design qualification prompt message is generated.

2. A method for judging the torsional strength of a double-ended stud with a lock key according to claim 1, characterized in that: The comparing of the torsional strength design value of the stud with a locking key and the corresponding standard value also includes: in response to the torsional strength design value being less than the corresponding standard value, generating a design failure prompt message.

3. A method for judging the torsional strength of a double-ended stud with a lock key according to claim 1, characterized in that: The double-ended stud with locking key comprises: A stud bolt, comprising a first stud bolt section (11) and a second stud bolt section (12) coaxial with the first stud bolt section (11) and having a diameter greater than that of the first stud bolt section (11), wherein the second stud bolt section (12) is provided with two groove structures (13) respectively disposed at two ends of the diameter of the second stud bolt section (12); A locking key (2), wherein the locking key (2) is placed in the groove structure (13).

4. A method for judging the torsional strength of a double-ended stud with a lock key according to claim 1, characterized in that: The shear strength calculated according to the tensile strength is: P2=0.5P1, Wherein, P2 is the shear strength, unit is MPa; P1 is the tensile strength, unit is MPa.

5. A method for judging the torsional strength of a stud with a lock key according to claim 1, characterized in that: The torsional strength design value of the double-ended stud with lock key is calculated based on the shear strength, lock key width, outer diameter of the thread of the stud screwed into the casing end, shear length of the lock key, and number of lock keys: T=(P2VdKL) / (2*1000), In the formula, T is the design value of torsional strength, in Nm; V is the number of lock keys, in pieces; d is the outer diameter of the thread, in mm; K is the lock key width, in mm; L is the shear length of the lock key, in mm.

6. A method for judging the torsional strength of a stud with a lock key according to claim 1, characterized in that: The shear length of the key does not include the chamfer dimension.

7. A device for judging the torsional strength of a double-ended stud with a lock key, characterized in that: It comprises a memory and a controller which are communicatively connected in sequence, wherein the memory stores a computer program, and the controller is used to read the computer program and execute a method for judging the torsional strength of a double-headed stud with a lock key as described in any one of claims 1 to 6.

8. A computer-readable storage medium having instructions stored thereon, characterized in that: When the instructions are executed on a computer, a method for judging the torsional strength of a double-headed stud with a lock key as described in any one of claims 1 to 6 is executed.

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