CN112212764A - Tool for measuring wall thickness of casting - Google Patents
Tool for measuring wall thickness of casting Download PDFInfo
- Publication number
- CN112212764A CN112212764A CN202011007485.9A CN202011007485A CN112212764A CN 112212764 A CN112212764 A CN 112212764A CN 202011007485 A CN202011007485 A CN 202011007485A CN 112212764 A CN112212764 A CN 112212764A
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- wall thickness
- tool
- measuring
- ratchet block
- upper seat
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- 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
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
- G01B5/06—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness for measuring thickness
-
- 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
- G01B5/0004—Supports
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention relates to a tool for measuring the wall thickness of a casting, which comprises an upper seat, an ejector rod, a ratchet block, a resetting mechanism and a base, wherein the ejector rod is arranged on the upper seat; a step structure is arranged in the upper seat; the ladder structure is matched with the resetting mechanism and the ratchet block; the middle part of the upper seat is provided with a through hole, and the ejector rod penetrates through the through hole to be connected with the ratchet block; the ejector rod is provided with scale marks; the upper seat is buckled on the base. The invention overcomes the problems that the inside of a cavity can not be directly measured by using a measuring tool and the wall thickness of a casting is measured inaccurately in the prior art, and provides the tool for measuring the wall thickness of the casting, which realizes the measurement of the wall thickness of the inside of the cavity of the casting, and has small error of a measuring result and convenient use.
Description
Technical Field
The invention relates to a measuring tool, in particular to a measuring tool for measuring the wall thickness of a casting during core setting.
Background
The inner cavity of the casting is generally provided with a staggered and coherent structure, particularly for an engine casting, the inner part of the casting is provided with structures with strict requirements on the wall thickness, such as an oil cavity, a water cavity and the like, within a tolerance range of 2mm, and meanwhile, because of the special shape, one sand core is required to completely cover the other sand core in the process design, so that a common measuring tool cannot stretch into the cavity to measure the distance (the wall thickness) between the two sand cores. In order to solve the problem, the existing measuring method generally comprises the steps of placing a mud pie on the top surface of a bottom sand core, feeding back the distance between an upper sand core and a lower sand core after the upper sand core and the lower sand core are contacted with the mud pie and extruded by utilizing the shaping capacity of the mud pie, and measuring the thickness of the mud pie by using a measuring tool after the upper sand core is lifted. The extruded mud mass is irregular, a straight plate must be placed on the upper plane of the mud mass when the thickness of the mud mass is measured, and the distance from the top surface of the lower sand core to the lower edge of the straight plate is measured to replace the direct measurement of the thickness of the mud mass. Because the straight board can extrude the mud group once more, and certain skew can appear in the straight board after the extrusion, finally lead to the reading to appear the error.
Disclosure of Invention
The invention overcomes the problems that the inside of a cavity can not be directly measured by using a measuring tool and the wall thickness of a casting is measured inaccurately in the prior art, provides a tool for measuring the wall thickness of the casting, realizes the measurement of the wall thickness of the inside of the cavity of the casting, and has small error of a measuring result and convenient use.
A tool for measuring the wall thickness of a casting comprises an upper seat, a mandril, a ratchet block, a resetting mechanism and a base; a step structure is arranged in the upper seat; the ladder structure is matched with the resetting mechanism and the ratchet block; the middle part of the upper seat is provided with a through hole, and the ejector rod penetrates through the through hole to be connected with the ratchet block; the ejector rod is provided with scale marks; the upper seat is buckled on the base.
A certain gap is arranged between the through hole arranged in the middle of the upper seat and the ejector rod, and the ejector rod can rotate up and down after penetrating through the through hole. The ejector pin is the cylinder, and the diameter is less than the diameter of through-hole, sets up the scale mark of unit millimeter along week. The ejector rod is provided with a jackscrew and a sleeve, the jackscrew can be arranged at the center line of the ejector rod, and the sleeve is arranged at one end of the jackscrew.
The ladder structure comprises a first ladder structure and a second ladder structure; the ratchet block is arranged at the first step structure; the resetting mechanism is arranged at the second step structure and is movably connected with the upper seat.
A certain gap is arranged between the first step structure and the ratchet block, and the ratchet block can move from top to bottom. The thorn piece is the cuboid, is provided with the sawtooth piece on one side terminal surface, and the sawtooth hypotenuse closed angle on the sawtooth piece is the fillet. One end of the ratchet block is inwards concave to form a groove, and the other end of the ratchet block is provided with a threaded hole along the center line of the groove. The ratchet block is connected with the other end of the jackscrew to fixedly connect the ejector rod with the ratchet block.
A reset mechanism is arranged in the second step structure; the reset mechanism comprises a reset seat, a leaf spring, a limiting rod, a braking pawl and a rotating shaft, a certain gap is arranged between the reset seat and the second stepped structure, an opening is formed in one side of the second stepped structure, the reset seat is U-shaped, and a drawing rod is arranged at one side of one end of the groove, faces the opening and is arranged on the outer side of the groove, and is used for drawing the reset seat out of the upper seat. Two groups of concentric through holes are arranged on the inner end surface of the groove body. A rotating shaft penetrates through the concentric through hole at one end close to the groove; the middle position of the rotating shaft is connected with a braking pawl, and the braking pawl can axially rotate around the rotating shaft in a neutral position of the reset seat. A leaf spring is arranged below the brake pawl along the width direction of the neutral position, and the middle projection of the leaf spring abuts against the brake pawl. The lower plane of the braking pawl is flush with the lower plane of the ratchet block, and an inclined sharp corner is formed at one end of the braking pawl and extends into the lower part of the sawtooth at the lowest end of the ratchet block. The limiting rod penetrates through the concentric through hole at one end close to the notch, is in line contact with the braking pawl in a static state, and enables the braking pawl to be horizontal through acting on the braking pawl together with the rotating shaft and the leaf spring.
The upper seat is further provided with a through hole penetrating through the second step structure, corresponding taper holes are formed in the outer end face of the groove body of the corresponding reset seat, and the cylindrical pin is in clearance fit with the taper holes in the reset seat through the through hole, so that the reset seat is fixedly connected to the upper seat.
The first step structure and the second step structure are communicated with each other to provide a movement space for the sawtooth block and the pawl.
The base is positioned at the lowest end of the upper seat and is consistent with the cross section of the upper seat in shape, a boss is arranged on the base, and an elastic mechanism is connected to the boss. The other end of the elastic mechanism is embedded into the groove on the ratchet block. The base and the upper seat are correspondingly provided with screw hole positions, so that the upper seat and the base are connected and fixed together.
After the sand core contacts and begins to extrude the ejector rod, the ratchet block moves downwards along with the ejector rod, and the saw tooth block stirs the brake pawl to enable the brake pawl to rotate axially by taking the rotating shaft as a center. When the surface contact between the ratchet block and the brake pawl is changed into the line contact during the rotation process, the brake pawl is reversely rotated by the elastic force of the leaf spring and enters into another gap between adjacent saw teeth. When the sand core is stably placed below the sand core, the pressure spring rebounds the ratchet block after the sand core is lifted, the ratchet block reversely stirs the brake pawl, the brake pawl is limited by the limiting rod in a horizontal state and cannot continuously rotate, the brake pawl and the ratchet block are in surface contact, the ratchet block is locked by the brake pawl and the pressure spring, the height between the top surface of the ejector rod and the bottom surface of the base is the thickness of the wall of the casting, and the thickness of the wall of the casting can be calculated by reading the scale on the surface of the ejector rod. After each measurement is finished, the cylindrical pin is pulled out, the restoring seat is pulled out by the pulling rod, the ratchet block is restored, and the ratchet block is inserted into the restoring seat again for reuse.
The size and the strength of each part in the whole device are limited, the minimum height from the top surface of the base to the top surface of the upper base after assembly is 10mm, and +/-2 mm is reserved in consideration of the size deviation of the sand core, so the minimum wall thickness measured by the device is 12 mm; when the wall thickness is more than 30mm, the sizes of all parts in the design of the invention can be proportionally adjusted to meet the measurement of thick and large walls. When the minimum wall thickness is 12mm and the error range is 2mm, the minimum height of the ejector rod is 5 mm; when different wall thicknesses and error requirements are met, ejector rods with different heights are used or a sleeve structure arranged by the ejector rods can be used for measurement, so that tools of the same specification can be provided with ejector rods with different heights to measure the wall thickness within a certain range, and the tool is multipurpose. The measuring method of the tool is simple, convenient and quick, and has the advantages of accurate measurement and small result deviation in the aspect of use.
Drawings
FIG. 1 is a schematic view of a tool for measuring wall thickness of a casting;
FIG. 2 is a half sectional view of a tool for measuring the wall thickness of a casting;
FIG. 3 is an exploded view of a tool for measuring wall thickness of a casting;
FIG. 4 is a schematic view of the upper seat;
FIG. 5 is a schematic view of the inner cavity of the upper base;
FIG. 6 is a schematic front view of the reset mechanism;
fig. 7 is a schematic reverse view of the reset mechanism.
The device comprises a top rod-1, an upper seat-2, a ratchet block-3, a pressure spring-4, a base-5, a top thread-6, a brake pawl-7, a cylindrical pin-8, a leaf spring-9, a reset seat-10, a rotating shaft-11, a first stepped structure-13, a second stepped structure-15, a limiting rod-16, a reset mechanism-17 and a draw rod-18.
Detailed Description
In order to more clearly illustrate the technical solution of the present invention, the present invention is further described in detail with reference to the following specific examples. Note that the following described embodiments are illustrative only for explaining the present invention, and are not to be construed as limiting the present invention.
The first embodiment is as follows:
a tool for measuring the wall thickness of a casting comprises an upper seat, a base, a reset mechanism, an ejector rod and a ratchet block.
The outer contour of the upper seat and the outer contour of the base can be cylindrical or rectangular, the diameters and the edge distances of the upper seat and the base are consistent, the size of the upper seat can be 40-100 mm, the height of the upper seat can be 9-25 mm, the thickness of the base can be 1-5 mm, screw hole positions are arranged on the upper seat and the base, and the upper seat and the base are connected and fastened together through screws.
The upper seat is internally provided with a first step structure and a second step structure. The first step structure is a cuboid, the cross section of the first step structure is a square, the side length is 10-30 mm, and the height is 8-20 mm; the ratchet block arranged in the first step structure is a cuboid with a square cross section and a height of 4-10 mm, a sawtooth block is arranged on one side of the ratchet block, the height of each sawtooth on the sawtooth block is 1-2 mm, the length of each sawtooth is 2-6 mm, and a fillet is formed at a sharp corner of a bevel edge; the lower part of the thorn block is inwards concave to form a groove, the radius of the groove body is 4-20 mm, and the height of the groove body is 2.5-7 mm.
The outline of the second step structure is consistent with the outline of the reset mechanism, the reset mechanism comprises a reset seat, a leaf spring, a limiting rod, a braking pawl and a rotating shaft, the clearance between the reset seat and the side outline is at least 0.1mm, an opening slightly larger than the height and width of the reset seat is arranged on one side of the second step structure close to the upper seat, and an arc surface or a plane is arranged on one side of the reset seat close to the upper seat, so that the reset seat can be conveniently drawn out of the second step structure. The rotating shaft and the limiting rod which are reset and seated penetrate through the U-shaped neutral position of the reset seat through the concentric through holes, the radius of the concentric through holes can be set to be 1-5 mm, the radius of the rotating shaft is set to be 0.9-4.9 mm, and the radius of the limiting rod is set to be 1-3 mm. A through hole penetrating through the second stepped structure is formed in the upper seat on the other side of the second stepped structure, and the radius of the through hole is 0.1mm larger than that of the cylindrical pin; the taper hole and the taper end of the cylindrical pin are in clearance fit, the radius of the cylindrical pin is 0.9-9.9 mm, the taper end penetrates through the reserved through hole of the upper seat and then penetrates into the taper hole of the reset seat, and the reset seat is firmly assembled in the upper seat.
Example two:
the upper seat 2 that the instrument of the casting wall thickness in this embodiment was the cylinder, corresponds to set up circular shape base 4, and the upper seat 2 top and base 4 set up the screw hole along horizontal central line bilateral symmetry to fasten upper seat 2 and base 5 together through jackscrew 6.
A boss is arranged at the center of the base 5, a pressure spring 4 is connected and fastened on the boss, and the radius of the inner ring of the pressure spring 4 is consistent with that of the boss of the base.
The upper seat 2 is internally provided with a stepped structure comprising a first stepped structure 13 and a second stepped structure 15. The uppermost part of the upper seat 2 is provided with a through hole downwards through a vertical central line, the ejector rod 1 can rotate up and down in the through hole, the ejector rod 1 is a cylinder, and scale marks are engraved along the circumference in unit of millimeter. The ejector rod 1 is provided with the ejector thread 6 and the sleeve along the central line, on one hand, the ejector rod 1 and the ratchet block 3 can be connected and fastened through the ejector thread, and on the other hand, the height of the ejector rod 1 can be designed according to the drawing size of the wall thickness of a casting.
The first step structure 13 is matched with the ratchet block 3, the ratchet block 3 can move from top to bottom in the first step structure 13, and a gap of 0.1mm is arranged between the first step structure 13 and the ratchet block 3; the ratchet block 3 is a cuboid with a square cross section, one side of the ratchet block is provided with a sawtooth block, and a group of sawteeth with bevel edge sharp corners as fillets are arranged on the sawtooth block. An inner groove is formed in one end of the ratchet block 3, and a threaded hole is formed in the other end of the ratchet block for fixedly connecting the ratchet block 3 and the ejector rod 1 through an ejector screw. The pressure spring 4 on the boss of base 5 is connected to 3 below of thorn piece, and the inner groovy radius of thorn piece 3 is unanimous with the outer lane radius of pressure spring 4, and in the recess of pressure spring 4 one end embedding thorn piece 3, on the boss of base 5 was advanced to one end cover, the effect of support, resilience thorn piece 3 was played to pressure spring 4.
A second stepped structure 15 is arranged on one side of the first stepped structure 13, a reset mechanism 17 is arranged in the second stepped structure 15, the reset mechanism 17 is composed of a reset seat 5, a leaf spring 9, a limiting rod 16, a braking pawl 7 and a rotating shaft 11, the reset seat 5 is U-shaped, and the outline of the reset seat 5 is consistent with the outline of the second stepped structure 15; the outer side of the reset seat 5 close to the upper seat is an arc surface or a plane, and the outer side is provided with a drawing rod 18, so that the reset seat 5 can be conveniently drawn out from the upper seat 2; the upper and lower sides of the reset seat 5 are inclined planes, which reduce the surface contact with the upper seat when the upper seat is inserted and taken out. Two groups of concentric through holes are arranged on the inner side wall of the reset seat 5. The two groups of concentric through holes are respectively provided with a rotating shaft 11 and a limiting rod 16 in a penetrating mode, the rotating shaft 11 is arranged inside, and the limiting rod 16 is arranged outside. The width of brake pawl 7 is unanimous with the sawtooth width, set up the through-hole on brake pawl 7 one side and connect the intermediate position at axis of rotation 11, the other end is less than the hypotenuse of sawtooth closed angle degree for the angle, closed angle department sets up the fillet, whole instrument assembly finishes the back, plane and the lower plane parallel and level of sour jujube piece 3 under the brake pawl 7, the closed angle of brake pawl 7 stretches into the below of sour jujube piece 3 lower extreme sawtooth, it is less than half of sawtooth length to stretch into length, ensure that most advanced can not block in the space of two sawtooth parts. The detent pawl 7 is axially rotatable about a rotational axis 11 in the U-shaped cavity of the reset seat 5. The width of the main body of the leaf spring 9 is smaller than that of the groove body in the reset seat 5, and the middle bulge of the leaf spring 9 abuts against the brake pawl 7 to play a role in supporting and rebounding the brake pawl 7. The limit lever 16 is in line contact with the detent 7 in the rest state and is positioned horizontally by acting on the detent 7 in cooperation with the rotary shaft 11 and the leaf spring 9. The upper seat on the other side of the second stepped structure 15 is provided with a through hole, and the cylindrical pin 8 penetrates through the through hole reserved in the upper seat and then penetrates into the conical hole arranged in the reset seat, so that the reset seat 5 is firmly assembled in the upper seat 2.
The first step structure 13 and the second step structure 15 penetrate through each other to provide a movement space for the saw teeth of the ratchet block 3 and the brake pawl 7.
In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "fixed," and the like are used broadly and can be, for example, fixedly connected, detachably connected, or integrated, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, connected between two elements, or in an interaction relationship between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Although embodiments of the present invention have been shown and described, it is understood that the embodiments are illustrative and not restrictive, that various changes, modifications, substitutions and alterations may be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A tool for measuring the wall thickness of a casting is characterized by comprising an upper seat, an ejector rod, a ratchet block, a resetting mechanism and a base;
a step structure is arranged in the upper seat and is matched with the resetting mechanism and the ratchet block;
the middle part of the upper seat is provided with a through hole, and the ejector rod penetrates through the through hole to be connected with the ratchet block;
the ejector rod is provided with scale marks;
the upper seat is buckled on the base.
2. A tool for measuring the wall thickness of a casting according to claim 1, wherein the base is provided with a resilient means.
3. A tool for measuring the wall thickness of a casting according to claim 2, wherein the step structure comprises a first step structure and a second step structure; the ratchet block is arranged at the first step structure; the resetting mechanism is arranged at the second step structure and is movably connected with the upper seat.
4. A tool for measuring the wall thickness of a casting according to claim 2, wherein the mandrel is provided with a jack screw and a sleeve, the sleeve is arranged at one end of the jack screw, and the ratchet block is connected with the other end of the jack screw.
5. The tool for measuring the wall thickness of the casting according to claim 4, wherein the ratchet block is a cuboid, and a sawtooth block is arranged on one side end face of the ratchet block; one end of the ratchet block is inwards concave to form a groove, and the other end of the ratchet block is provided with a threaded hole along the center line of the groove.
6. A tool for measuring the wall thickness of a casting according to claim 5, wherein the sawtooth block is provided with a plurality of sawteeth, the sloping edges of the sawteeth are sharp and have round corners.
7. The tool for measuring the wall thickness of the casting according to claim 1, wherein the reset mechanism comprises a reset seat, a leaf spring, a limiting rod, a braking pawl and a rotating shaft.
8. A tool for measuring the wall thickness of a casting according to claim 7, wherein the reset seat is U-shaped, and two sets of concentric through holes are arranged on the inner side wall of the reset seat.
9. A tool for measuring the wall thickness of a casting according to claim 7, wherein a tapered hole is formed in one side outer wall of the reset seat.
10. A tool for measuring the wall thickness of a casting according to claim 8, wherein the rotating shaft is disposed in a concentric bore proximate one end of the opening; the limiting rod is arranged in a concentric through hole close to one side of the ratchet block; the middle position of the rotating shaft is connected with the braking pawl; and a leaf spring is arranged below the braking pawl, and the middle protrusion of the leaf spring abuts against the braking pawl.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011007485.9A CN112212764B (en) | 2020-09-28 | 2020-09-28 | Tool for measuring wall thickness of casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011007485.9A CN112212764B (en) | 2020-09-28 | 2020-09-28 | Tool for measuring wall thickness of casting |
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| Publication Number | Publication Date |
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| CN112212764A true CN112212764A (en) | 2021-01-12 |
| CN112212764B CN112212764B (en) | 2023-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011007485.9A Active CN112212764B (en) | 2020-09-28 | 2020-09-28 | Tool for measuring wall thickness of casting |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4638568A (en) * | 1984-01-31 | 1987-01-27 | Taiho Kogyo Corporation, Ltd. | Method and apparatus for measuring wall thickness of a workpiece |
| JPH08313202A (en) * | 1995-05-23 | 1996-11-29 | Hooya Precision Kk | Measuring method of thickness of molded material |
| US6130536A (en) * | 1998-07-14 | 2000-10-10 | Crown Cork & Seal Technologies Corporation | Preform test fixture and method of measuring a wall thickness |
| CN104132603A (en) * | 2013-05-10 | 2014-11-05 | 国家电网公司 | Occlusion depth gauge |
| CN111121587A (en) * | 2020-01-09 | 2020-05-08 | 阿尔特汽车技术股份有限公司 | Chassis ground clearance measures frock |
-
2020
- 2020-09-28 CN CN202011007485.9A patent/CN112212764B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4638568A (en) * | 1984-01-31 | 1987-01-27 | Taiho Kogyo Corporation, Ltd. | Method and apparatus for measuring wall thickness of a workpiece |
| JPH08313202A (en) * | 1995-05-23 | 1996-11-29 | Hooya Precision Kk | Measuring method of thickness of molded material |
| US6130536A (en) * | 1998-07-14 | 2000-10-10 | Crown Cork & Seal Technologies Corporation | Preform test fixture and method of measuring a wall thickness |
| CN104132603A (en) * | 2013-05-10 | 2014-11-05 | 国家电网公司 | Occlusion depth gauge |
| CN111121587A (en) * | 2020-01-09 | 2020-05-08 | 阿尔特汽车技术股份有限公司 | Chassis ground clearance measures frock |
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| Publication number | Publication date |
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| CN112212764B (en) | 2023-01-03 |
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