CN111189372B - Femoral stem deflection angle visual inspection tool and inspection method thereof - Google Patents
Femoral stem deflection angle visual inspection tool and inspection method thereof Download PDFInfo
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- CN111189372B CN111189372B CN202010145708.1A CN202010145708A CN111189372B CN 111189372 B CN111189372 B CN 111189372B CN 202010145708 A CN202010145708 A CN 202010145708A CN 111189372 B CN111189372 B CN 111189372B
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- 238000011179 visual inspection Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims description 7
- 238000007689 inspection Methods 0.000 title description 4
- 238000005242 forging Methods 0.000 claims abstract description 145
- 238000001514 detection method Methods 0.000 claims abstract description 61
- 238000003780 insertion Methods 0.000 claims abstract description 53
- 230000037431 insertion Effects 0.000 claims abstract description 53
- 210000000689 upper leg Anatomy 0.000 claims abstract description 23
- 210000000501 femur body Anatomy 0.000 claims abstract description 22
- 230000005484 gravity Effects 0.000 claims abstract description 13
- 238000009434 installation Methods 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000000007 visual effect Effects 0.000 claims description 3
- 210000002391 femur head Anatomy 0.000 claims 1
- 210000003128 head Anatomy 0.000 description 8
- 238000013461 design Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 210000000887 face Anatomy 0.000 description 2
- 210000004394 hip joint Anatomy 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000105 evaporative light scattering detection Methods 0.000 description 1
- 238000012966 insertion method Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000004441 surface measurement Methods 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/0002—Arrangements for supporting, fixing or guiding the measuring instrument or the object to be measured
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/20—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B5/25—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Prostheses (AREA)
Abstract
The visual inspection device comprises a front die and a rear die with a vertical insertion cavity, wherein a vertical insertion positioning surface is arranged on the right side of the cavity, a first guide pin and a second guide pin which are tangential to the left side of a standard forging femur body are arranged at the bottom of the left side of the cavity, a detection line deflection angle lambda which is determined by the two points of the first guide pin and the second guide pin and is inclined downwards to the right is identical to a standard forging deflection angle beta, a cone tip of the standard forging slides into the cavity by gravity and is exposed out of an opening below the cavity, the horizontal width of an insertion opening of the cavity is exactly equal to the horizontal width of the widest part of a rotor ridge of the standard forging, and a to-be-detected forging with the cone tip of the femur exposed out from the lower side of the exposure opening is a qualified forging, otherwise, the to-be-detected forging is a disqualified forging. The invention adopts a mode of inserting and placing by utilizing the free falling body and then visually inspecting whether the cone tip is exposed from the bottom to detect whether the forging is qualified or not, thereby meeting the requirement of large-batch high-efficiency detection of the forging, and having no need of vernier caliper assistance, and the detection is simple, convenient, economic, efficient and practical.
Description
Technical Field
The invention belongs to the technical field of physical irregular surface measurement detection tools, and particularly relates to a femur stem deflection angle visual inspection tool and a detection method thereof.
Background
Titanium alloy femoral stems are an important component of artificial hip joint systems, wherein the femoral stems must be forged to achieve good mechanical properties and tissue stability. However, during forging treatment, the internal stress of the femoral stem forging is influenced by sudden changes of internal and external temperatures of the forging, and the internal thermal stress of the forging is very easy to cause different degrees of buckling deformation of the forging in the process of rapidly cooling the surface of the forging, so that the deflection angle of the forging is out of tolerance. In order to obtain a femoral stem forging product with consistent deflection angle quality, the conventional three-coordinate measurement method for measuring the deflection angle of the femoral stem forging is low in efficiency and is not suitable for mass detection. In contrast, the publication number CN209197631U discloses a detection tool for the section width of the femoral stem of the hip joint prosthesis, but only detects the section width of the femoral stem, and cannot meet the deflection angle beta of the femoral head of the femoral stem relative to the vertical femoral body, and directly visually detects whether the femoral stem meets the requirement of large-scale rapid and efficient detection on the premise of not using any precision detection tool such as a vernier caliper. In this regard, the following technical solutions are now proposed.
Disclosure of Invention
The invention solves the technical problems that in the prior art, a femoral stem forging piece is subjected to cooling shrinkage, and is subject to buckling deformation due to thermal stress, so that the femoral stem forging piece has an out-of-tolerance deflection angle, and the technical problem that whether the femoral stem forging piece deflection angle is qualified in a large scale or not can be rapidly realized only by visual inspection under the condition that a vernier caliper is not used is solved.
The technical scheme adopted by the invention is that the femur stem deflection angle visual inspection tool is characterized by comprising a front die and a rear die which are symmetrically distributed relative to a front shaft and a rear shaft of a vertical plane; the front and the rear dies are fastened into a whole from front to back to form an inserting and placing gauge with a vertical long-channel penetrating structure; the front and rear mould forms a mould body with vertical insertion cavities with front and rear axisymmetric; the right side of the insertion cavity is provided with a vertical insertion positioning surface, the vertical insertion positioning surface is used for vertically righting the forge piece from the right side of the forge piece to ensure the vertical insertion of the forge piece in the cavity, the vertical insertion positioning surface is matched with the vertical insertion positioning surface, a first guide pin and a second guide pin are arranged at the bottom of the rear cavity body, the first guide pin and the second guide pin are horizontally arranged perpendicular to the vertical plane of the front die body and the rear die body, the outer cylindrical surfaces of the first guide pin and the second guide pin are tangent to the left side of the standard forge piece femoral body when the standard forge piece is vertically inserted in the cavity, when the standard forge piece is freely inserted in the cavity by means of the gravity of the forge piece, the conical tip of the standard forge piece is exposed from the lower side of the exposed opening, the first guide pin and the second guide pin form a linear detection line inclined towards the right lower side of the cavity according to the principle of two points, the deflection angle lambda of the detection line relative to the vertical direction is the same as the deflection angle beta of the femoral head relative to the vertical femoral body when the standard forge piece is vertically inserted in the cavity, the top of the cavity is the vertical insertion opening of the forge piece, the bottom of the cavity is the taper insertion opening of the forge piece, the taper insertion opening is the conical insertion opening is formed, the taper opening is formed by the bottom end of the vertical insertion opening of the forge piece, the taper opening is formed by the taper opening and the taper opening is wide and the taper opening is horizontally exposed from the bottom of the forge piece to the horizontal insertion opening is free to the horizontal opening to the forge piece, and the horizontal opening is free to be exposed to the bottom of the forge opening is by the gravity of the vertical opening is to the flat to the vertical opening to side of the forge body is to and is to be exposed to the position to and is to the position to side to and to side to and to side, the middle part between the standard forging rotor-to-rotor ridge and the bottom end of the femur body completely and vertically slides into the detection cavity, the bottom end of the standard forging femur body is exposed from the lower part of the exposure opening, the horizontal width of the inserting opening at the top end of the cavity is just equal to the horizontal width of the widest part of the standard forging rotor-to-rotor ridge, when a to-be-detected forging freely falls down by virtue of the gravity of the forging and slides into the cavity, the to-be-detected forging exposed from the lower part of the exposure opening by the cone tip of the femur body of the to-be-detected forging is a qualified forging, and the to-be-detected forging not exposed from the exposure opening by the cone tip of the femur body of the to-be-detected forging is a disqualified forging.
The detection device is characterized in that the front die and the rear die are used for conveniently detecting the femoral stem forgings with different bending angles, the first guide pin and the second guide pin are detachably and fixedly installed at the bottom of the rear die through a plurality of pairs of installation holes coaxial with the guide pins, and the central connecting line of each pair of installation holes is inclined towards the lower right of the cavity respectively to form a plurality of detection lines with different angles.
The detection method of the femur stem deflection angle visual inspection tool using any one of the above technical schemes comprises the following steps:
Step one, selecting a front die and a rear die and assembling, namely determining a detection line inclined towards the right lower part of the cavity in the cavity by a first guide pin and a second guide pin which are arranged at the bottoms of the front die and the rear die according to the principle that two points are used for determining a straight line, wherein the deflection angle lambda of the detection line relative to the vertical direction is the same as the deflection angle beta of a femoral head relative to a vertical femur body when a standard forging is vertically inserted into the cavity;
Secondly, the femur stem deflection angle visual inspection device is placed forward, namely the horizontal widths of the insertion opening and the exposure opening are compared in a visual manner, one end with the larger horizontal width faces upwards, and one end with the smaller horizontal width faces downwards, and the femur stem deflection angle visual inspection device after being placed forward is held by a single hand;
Inserting the to-be-tested forging into the cavity by the other hand, inserting the femoral cone tip of the to-be-tested forging into the insert hole at the top end of the cavity of the positive-placed checking fixture, enabling the to-be-tested forging to freely fall down to the bottom of the cavity by utilizing the gravity of the forging, enabling the femoral cone tip of the to-be-tested forging to be a qualified forging from the to-be-tested forging exposed below the exposure opening, enabling the femoral cone tip of the to-be-tested forging not to be a disqualified forging from the exposure opening, and enabling the horizontal breadth at the widest part of the ridges between rotors of the qualified to-be-tested forging to be just clamped at the insert hole at the top end of the cavity.
Compared with the prior art, the invention can realize the following effects:
1. The technical proposal has the advantages of small volume, high detection efficiency, low requirements on the processing precision of the front and rear die cavities, excellent reliability, small detection error of deflection angle precision, practicality and durability, low technical requirements on inspectors, and capability of meeting the requirements of a large amount of high-efficiency detection;
2. The guide pin can be detachably and fixedly arranged at the bottom of the rear die in a wedging mode, a threaded connection mode and the like, the detection line 7 of the gauge can be used for adjusting and replacing the installation positions of the first guide pin and the second guide pin at any time according to the change of the deflection angle beta of the forge piece to be measured, so that the deflection angle of the detection line 7 at the left side in the cavity of the gauge is adaptively changed, the adaptive adjustment and replacement detection requirements of a set of die body for standard forge pieces with different deflection angles are met, and the gauge is multipurpose, economical and practical.
Drawings
FIG. 1 is a front view of a gauge of the present invention in use for detecting standard forgings;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a top view of the insert port of FIG. 1 according to the present invention;
FIG. 4 is a B-B cross-sectional view of FIG. 3 showing a sensing line 7 defined at two points about the first and second guide pins;
FIG. 5 is a perspective view of FIG. 1 in accordance with the present invention;
FIG. 6 is a schematic diagram of the rear mold bottom of FIG. 4 with first and second guide pin determination lines 7 installed;
FIG. 7 is a schematic diagram of the deflection angle detection principle of a standard forging (femoral stem) matched with the cavity detection principle of the posterior mould of FIG. 6;
FIG. 8 is a perspective view of the front and rear modules of FIG. 5 alone;
FIG. 9 is a schematic view of a plurality of pairs of first and second guide pin mounting holes formed in a rear mold cavity that can form different inspection lines.
Detailed Description
Specific embodiments of the present invention are described below with reference to fig. 1-9. It should be understood that the embodiments described below are exemplary only and are not intended to be a specific limitation on the invention.
The following examples facilitate a better understanding of the present invention, but are not intended to limit the same. The insertion method and the forging method in the following examples are conventional methods. The components and materials of the components used in the examples described below are commercially available unless otherwise specified.
In the present invention, unless otherwise indicated, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships that are based on the orientation or positional relationships shown in the drawings, and are merely for convenience in describing the simplified description of the present invention, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "disposed," and "provided" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or indirectly connected through other intermediate members. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The visual inspection tool for the deflection angle of the femoral stem is characterized by comprising a front die 1 and a rear die 2 (see fig. 1, 2 and 8) which are axially and symmetrically distributed relative to a vertical plane, wherein the front die 1 and the rear die 2 are fastened and connected into a whole by using a front hexagonal socket head cap screw and a rear hexagonal socket head cap screw to realize disassembly or combination and form an insertion inspection tool of a vertical long-channel penetrating structure, the description is that the structure (see fig. 2) with the front die 1 and the rear die 2 which are axially and symmetrically distributed is beneficial to reducing the processing difficulty of a die firstly, and the straightness of the vertical right side wall of a cavity 3 of a die closing channel type structure of the front die 1 and the rear die 2 can meet the positioning requirement of the vertical insertion of a forging 4 in the cavity 3 only by ensuring the straightness of the vertical right side wall of the cavity 3 during processing, and compared with the special-shaped cavity inspection tool matched with a standard forging, the process and the structure are lower in the dimensional precision requirement of the die, so that the manufacturing cost of the die is beneficial to reducing. On the basis, the front and rear dies (1, 2) are fastened together by the front and rear fasteners, so that the front and rear dies (1, 2) can be assembled or disassembled conveniently, and the installation or replacement of the first and second guide pins (5, 6) is facilitated, namely the adjustment of the deflection angles of the first and second guide pins (5, 6) is realized. On the basis, the adjustment of the deflection angle is detected by the first guide pin (5) and the second guide pin (6), and the fact that whether the included angle formed between the intertrochanteric crest of the forging piece 4 and the femoral stem is qualified or not is detected by the first guide pin (5) and the second guide pin (6) according to the principle that two points are determined by one straight line is needed, and the fact that the intertrochanteric crest is a professional naming term of the corresponding part of the femoral stem is needed, and the intertrochanteric crest is usually indicated as a junction 4-4 (shown in fig. 7) of a femoral stem rotor and a femoral body. The right side vertical side wall of the long-channel cavity 3 is a vertical datum line for vertically positioning and leaning against the forge piece 4, and the left side of the cavity is provided with a detection line 7 through a first guide pin 5 and a second guide pin 6. the die body formed by the front die (1) and the rear die (2) is internally provided with a vertical insertion cavity 3 with front and rear axisymmetric, the right side of the insertion cavity 3 is provided with a vertical insertion positioning surface 3-3, the vertical insertion positioning surface 3-3 is used for vertically righting the forge piece 4 from the right side of the forge piece 4 so as to ensure the vertical insertion of the forge piece 4 in the cavity 3, the vertical insertion positioning surface 3-3 is matched with the forge piece, the bottom of the rear die 2 is provided with a first guide pin 5 and a second guide pin 6, and the first guide pin 5 and the second guide pin 6 are perpendicular to the front die (1) and the rear die (1), 2) The die body is horizontally arranged on a vertical plane of the die body (the azimuth shown in fig. 4), the outer cylindrical surfaces of the first guide pin 5 and the second guide pin 6 are tangent to the left side of the standard forging 4 femur 4-2 when the standard forging 4 is vertically inserted and placed in the cavity 3 (see fig. 4), the conical tip 4-3 of the standard forging 4 is exposed out of the lower part of the exposed opening 3-2 when the standard forging 4 is freely inserted and placed in the cavity by means of the gravity of the forging, a detection line 7 (see fig. 6) inclined towards the lower right of the cavity 3 is formed in the middle of the cavity 3 according to the principle that two points are determined on the first guide pin 5 and the second guide pin 6, the deflection angle lambda of the detection line 7 relative to the vertical direction is the same as the deflection angle beta of the femur 4-1 relative to the vertical femur 4-2 when the standard forging 4 is vertically inserted and placed in the cavity 3 (see fig. 4, fig. 6 and 7), the top end of the cavity 3 is an insertion port 3-1 in which the forging piece 4 is vertically inserted, the bottom end of the cavity 3 is an exposure port 3-2 of a conical tip 4-3 at the bottom end of a femur body of the forging piece 4, the insertion port 3-1 and the exposure port 3-2 are rectangular structures (see fig. 3 and 8), and the horizontal width of the insertion port 3-1 is larger than that of the exposure port 3-2 (see fig. 4, 6 and 9), so that visual comparison can be performed according to the sizes of the insertion port 3-1 and the exposure port 3-2, and the upper end and the lower end of the gauge can be rapidly distinguished. The forging to be tested slides down from the insertion port 3-1 to the bottom of the cavity 3 by utilizing the gravity of the forging 4, and the middle part between the trochanter ridge of the standard forging 4 and the bottom end of the femur body completely slides into the detection cavity 3 vertically, wherein the term between trochanter ridge is a professional naming term of the corresponding part of the femur handle, and generally refers to the junction 4-4 (shown in fig. 7) of the trochanter and the femur body of the femur handle. The bottom end of the femur body of the standard forging piece 4 is exposed from the lower part of the exposure opening 3-2, the horizontal width of the inserting opening 3-1 at the top end of the long-channel cavity 3 is just equal to the horizontal width of the widest part of the rotor ridges of the standard forging piece 4, when the forging piece to be tested slides into the cavity by virtue of the free falling body of the gravity of the forging piece, the forging piece to be tested, of which the cone tip 4-3 of the femur body of the forging piece to be tested is exposed from the lower part of the exposure opening 3-2, is a qualified forging piece, and the forging piece to be tested, of which the cone tip 4-3 of the femur body of the forging piece to be tested is not exposed from the exposure opening 3-2, is a disqualified forging piece.
In the above embodiment, further, the first guide pin 5 and the second guide pin 6 are detachably and fixedly installed at the bottom of the rear mold 2 through a plurality of pairs of installation holes 5-1 (as shown in fig. 9) coaxial with the guide pins, respectively, and the central connecting line of each pair of installation holes 5-1 is inclined towards the lower right of the cavity 3 to form a plurality of detection lines 7 with different angles. It should be noted that, the plurality of mounting holes 5-1 shown in fig. 9 correspond to the deflection angles of three groups of different angle detection lines 7 respectively, namely detection lines 7 corresponding to degrees of λ1 °, λ2 and λ3 respectively, and the straight line detection lines 7 determined by two points of each pair of mounting holes 5-1 correspond to the mounting holes 5-1 of the required detection lines 7 respectively, and the first guide pin and the second guide pin (5, 6) are fixedly mounted in a screwing or wedging manner respectively. Therefore, the batch, high-efficiency and scaleless visual inspection using requirements of whether the to-be-tested forge piece with the deflection angle femoral head of the detection line 7 is qualified or not are met. Typically, the yaw angle λ1 °, λ2 °, λ3 ° is between 35 ° and 45 °.
In the above embodiment, further: in order to facilitate the detection of femoral stem forgings with different bending angles by using the front and rear dies (1, 2), the detection method of the femoral stem deflection angle visual inspection tool is characterized by comprising the following steps:
Step one, selecting a front die 1 and a rear die 2 and assembling (as shown in figure 6), namely determining a detection line 7 inclined towards the lower right of the cavity 3 in the cavity 3 according to the principle that two points are determined to be a straight line by a first guide pin 5 and a second guide pin 6 which are arranged at the bottoms of the front die 1 and the rear die 2, wherein the deflection angle lambda of the detection line 7 relative to the vertical direction is the same as the deflection angle beta of the femoral head 4-1 relative to the vertical femoral body 4-2 when the standard forging 4 is vertically inserted in the cavity 3. Selecting a proper detection line 7 according to the deflection angle beta degrees of a standard forging piece, and combining front and rear dies (1, 2) after installing pins;
Secondly, a visual inspection device (shown in figure 8) for the bending degree of the forward-placed femoral stem is obtained by visually comparing the horizontal widths of the insertion opening 3-1 and the exposure opening 3-2, wherein the insertion opening 3-1 is upwards at one end with the larger horizontal width, the exposure opening 3-2 at the other end with the smaller horizontal width is downwards, and the visual inspection device for the deflection angle of the forward-placed femoral stem is held by a single hand;
Inserting the to-be-tested forging (shown in figure 5), namely holding the to-be-tested forging by the other hand, inserting the cone tip of the femur of the to-be-tested forging from the top end inserting port 3-1 of the positive-placed checking fixture cavity 3, enabling the to-be-tested forging to freely fall down to the bottom of the cavity 3 by utilizing the gravity of the forging, enabling the cone tip 4-3 of the femur of the to-be-tested forging to be a qualified forging (shown in figure 4) from the to-be-tested forging exposed below the exposure port 3-2, enabling the cone tip 4-3 of the femur of the to-be-tested forging not to be exposed from the exposure port 3-2 and enabling the largest horizontal width of the ridges among rotors of the qualified to-be-tested forging to be exactly clamped at the top end inserting port 3-1 of the cavity 3 (shown in figure 4). It should be emphasized that even if part of the femoral body cone tip 4-3 of the forging to be tested can be exposed from the exposure opening 3-2, while the femoral body cone tip 4-3 can be exposed from the exposure opening 3-2, if the horizontal breadth of the widest part of the inter-rotor ridge of the forging to be tested is located above the insertion opening 3-1 at the top end of the cavity 3, the forging to be tested is still an unqualified forging, that is, the forging to be tested slides into the cavity, but the deflection angle is still deviated from the deflection angle of the standard forging. Therefore, whether the forging to be detected is qualified or not is judged by visual inspection, and two conditions are required to be met simultaneously, namely, one condition is that the conical tip 4-3 at the bottom end of the forging to be detected can be exposed from the exposure opening 3-2, and the other condition is that the horizontal width at the widest part of the ridges between rotors of the forging to be detected is just clamped at the inserting opening 3-1 at the top end of the cavity 3 (as shown in figure 4). The lack is inexhaustible.
The working principle comprises that a front die 1 and a rear die 2 are fastened together through hexagon socket head cap screws, an inserting and discharging cavity 3 used for detecting whether the deflection angle of a femoral stem forging piece meets the requirement is formed in a front die body and a rear die body 1 and a rear die body 2, vertical insertion of the forging piece is detected through the vertical inserting and discharging cavity 3 along a right side vertical inserting and discharging locating surface 3-3 of the cavity, a first guide pin 5 and a second guide pin 6 which are arranged on the left side of the inserting and discharging cavity 3 determine a detection line 7 which inclines downwards to the right according to the principle that two points are determined, the forging piece to be detected slides into the cavity 3 from an inserting port 3-1 by means of free falling bodies of gravity of the forging piece, only the deflection angle of the forging piece to be detected is exposed from a bottom exposed outlet 3-2 of a checking tool when the deflection angle beta of the forging piece to be detected is identical to the deflection angle lambda of the standard forging piece, and the horizontal width of the forging piece to be detected at the top edge of the top to be detected exposed from the bottom outlet 3-2 of the checking tool can be directly observed by naked eyes, namely, the deflection angle of the forging piece to be detected meets the standard deflection angle requirements is indicated by the standard design. When the deflection angle of the forging to be tested deviates from the deflection angle beta of the standard forging and the deflection angle lambda of the detection line 7, the forging to be tested is inevitably clamped in the cavity 3 and cannot slide down smoothly, on one hand, the cone tip of the femur of the forging to be tested cannot be exposed from the exposure port 3-2, even if a small point is exposed, as long as the widest part of the ridge between the top of the forging to be tested is elevated above the insertion port 3-1, the deflection angle of the forging to be tested is not in accordance with the design requirement.
Compared with the prior art, the invention designs a method for detecting the femur body taper point of the forging piece by using the auxiliary detection of the precision measurement gauge without using a vernier caliper and the like, and directly through simple loose hand insertion operation, a detector only needs to observe whether the bottom end of the femur body taper point of the forging piece to be detected is exposed from the exposed outlet 3-2 at the bottom end of the gauge, and the femur body taper point is exposed from the exposed outlet 3-2, and meanwhile, if the horizontal width of the widest part of the ridge between the tops of the forging piece to be detected is exactly clamped at the inserting port 3-1 at the top end of the cavity 3, the forging piece is a qualified forging piece, and otherwise, the forging piece is a disqualified forging piece. Compared with the die design that the detection can be completed only by adopting precise detection tools such as vernier calipers and the like under the authorized bulletin number of CN209197631U, the detection can be completed by visual inspection, the detection efficiency can be greatly improved, and the method is particularly suitable for large-scale efficient detection of femur stem forgings with fixed deflection angles of beta degrees. Furthermore, the deflection angle lambda of the detection line 7 can be adjusted by replacing the mounting positions of the first and second guide pins (5, 6) in different pairs of mounting holes 5-1.
Through the description, the invention has the advantages of small volume, high detection efficiency, low requirements on the processing precision of the front die cavity and the rear die cavity, excellent reliability, small detection error of the deflection angle precision, practicability and durability, low technical requirements on testers and capability of meeting the requirements of a large number of high-efficiency detection. In addition, the guide pin can be detachably and fixedly arranged at the bottom of the rear die in a wedging mode, a threaded connection mode and the like, the detection line 7 of the gauge can be used for adjusting and replacing the installation positions of the first guide pin 5 and the second guide pin 6 at any time according to the change of the deflection angle beta of the forge piece to be detected, so that the deflection angle of the detection line 7 at the left side in the cavity of the gauge is adaptively changed, a set of die body is suitable for the adaptive adjustment and replacement detection requirements of standard forge pieces with different deflection angles, and the gauge is multipurpose, economical and practical.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of the present invention, so that all equivalent modifications made by the appended claims shall be included in the scope of the present invention.
Claims (3)
1. The femur stem deflection angle visual inspection tool is characterized by comprising a front die (1) and a rear die (2) which are axially symmetrically distributed relative to a vertical plane, wherein the front die (1) and the rear die (2) are fixedly connected into a whole front and rear to form an insertion tool with a vertical long channel penetrating structure, a vertical insertion cavity (3) which is axially symmetrical front and rear is formed in a die body formed by the front die (1) and the rear die (2), a vertical insertion positioning surface (3-3) is formed on the right side of the insertion cavity (3), the vertical insertion positioning surface (3-3) is used for vertically righting a forging (4) from the right side of the forging (4) to ensure the vertical insertion of the forging (4) in the cavity (3), the insertion tool is matched with the vertical insertion positioning surface (3-3), a first guide pin (5) and a second guide pin (6) are arranged at the bottom of the cavity (3), and the first guide pin (5) and the second guide pin (6) are perpendicular to the front die (1) and the rear die (1), 2) The die body is horizontally arranged on a vertical plane, the outer cylindrical surfaces of the first guide pin (5) and the second guide pin (6) are tangent to the left side of a femur body (4-2) of a standard forging piece (4) when the standard forging piece (4) is vertically inserted and placed in the cavity (3), the first guide pin (5) and the second guide pin (6) form a detection line (7) inclined towards the right lower side of the cavity (3) in the middle of the cavity (3) according to the principle that two points are determined, the deflection angle lambda of the detection line (7) inclined towards the right lower side is the same as the deflection angle beta of the femur head (4-1) relative to the vertical femur body (4-2) when the standard forging piece (4) is vertically inserted and placed in the cavity (3), the top end of the cavity (3) is the insertion opening (3-1) for vertically inserting the forging piece (4), the bottom end of the cavity (3) is the exposure opening (3-1) of the femur body bottom taper point (4-3), the insertion opening (3-1) and the exposure opening (3-2) are of a rectangular structure, the insertion opening (3-2) is the rectangular structure, the width of the insertion opening (3-2) is larger than the width of the insertion opening (3-2) and the free from the horizontal opening (3) to the bottom (3) to be tested by gravity, the middle part between the rotor ridges of the standard forging piece (4) and the bottom end of the femur body completely and vertically slides into the detection cavity (3), the bottom end of the femur body of the standard forging piece (4) is exposed from the lower part of the exposure opening (3-2), the horizontal width of the insertion opening (3-1) at the top end of the long channel cavity (3) is exactly equal to the horizontal width of the widest part of the rotor ridges of the standard forging piece (4), when the forging piece to be detected slides into the cavity by means of free falling of the gravity of the forging piece, the forging piece to be detected, of which the femur body cone tip (4-3) is exposed from the lower part of the exposure opening (3-2), is a qualified forging piece, and the forging piece to be detected, of which the femur body cone tip (4-3) is not exposed from the exposure opening (3-2), is a disqualified forging piece.
2. The visual inspection tool for the deflection angle of the femoral stem according to claim 1, wherein the first guide pin (5) and the second guide pin (6) are detachably and fixedly installed at the bottom of the rear die (2) of the cavity (3) through a plurality of pairs of installation holes (5-1) coaxial with the guide pins respectively, and the central connecting line of each pair of installation holes (5-1) is inclined towards the lower right of the cavity (3) respectively to form a plurality of detection lines (7) with different angles.
3. A method for detecting the femoral stem yaw angle by using the visual inspection tool according to claim 1 or 2, comprising the steps of:
Firstly, selecting a front die (1) and a rear die (2) and assembling, namely determining a detection line (7) inclined towards the lower right of the cavity (3) in the cavity (3) according to the principle that two points are determined by a first guide pin (5) and a second guide pin (6) which are arranged at the bottoms of the front die (1) and the rear die (2), wherein the deflection angle lambda of the detection line (7) relative to the vertical direction is the same as the deflection angle beta of the femoral head (4-1) relative to the vertical femoral body (4-2) when a standard forging (4) is vertically inserted in the cavity (3);
secondly, the femur stem deflection angle visual inspection device is put forward, namely the horizontal widths of the insertion opening (3-1) and the exposure opening (3-2) are compared in a visual manner, one end with the larger horizontal width is upwards, and one end with the smaller horizontal width is downwards, and the femur stem deflection angle visual inspection device after being put forward is held by one hand;
Inserting the to-be-tested forging, namely holding the to-be-tested forging by the other hand, inserting the conical tip of the femur of the to-be-tested forging into the insertion port (3-1) at the top end of the positive-placed checking fixture cavity (3), enabling the to-be-tested forging to freely fall down to the bottom of the cavity (3) by utilizing the gravity of the forging, enabling the conical tip (4-3) of the femur of the to-be-tested forging to be exposed from the lower part of the exposure port (3-2) to be a qualified forging, enabling the conical tip (4-3) of the femur of the to-be-tested forging not to be exposed from the exposure port (3-2) and enabling the to-be-tested forging clamped in the cavity to be a disqualified forging, and enabling the horizontal width of the widest part of the ridge between rotors of the qualified to be-tested forging to be just clamped at the insertion port (3-1) at the top end of the cavity (3).
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| CN111780649B (en) * | 2020-07-28 | 2021-12-14 | 北京地铁车辆装备有限公司 | Taper measuring tool |
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| CN211476921U (en) * | 2020-03-05 | 2020-09-11 | 陕西斯坦特生物科技有限公司 | Utensil is examined to thighbone handle beat angle range estimation |
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| US5318571A (en) * | 1992-05-14 | 1994-06-07 | Benson Gail M | Method and apparatus for simplifying total hip arthroplasty |
| US6395004B1 (en) * | 1997-11-14 | 2002-05-28 | Sulzer Orthopedics Inc. | Orthopedic trial prosthesis and saw guide instrument |
| CN203011356U (en) * | 2012-11-29 | 2013-06-19 | 北京百慕航材高科技股份有限公司 | An artificial hip joint prosthetic femoral handle component clamping device |
| CN108524062B (en) * | 2018-02-24 | 2020-09-04 | 吴承锦 | Femoral stem |
| CN209197631U (en) * | 2018-12-31 | 2019-08-02 | 天津正天医疗器械有限公司 | A kind of hip prosthesis femoral stem cross-sectional width cubing |
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| CN211476921U (en) * | 2020-03-05 | 2020-09-11 | 陕西斯坦特生物科技有限公司 | Utensil is examined to thighbone handle beat angle range estimation |
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