CN111036722A - Casting correcting device and casting correcting method - Google Patents

Casting correcting device and casting correcting method Download PDF

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Publication number
CN111036722A
CN111036722A CN201911373309.4A CN201911373309A CN111036722A CN 111036722 A CN111036722 A CN 111036722A CN 201911373309 A CN201911373309 A CN 201911373309A CN 111036722 A CN111036722 A CN 111036722A
Authority
CN
China
Prior art keywords
casting
base
plate
orthopedic
mounting seat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911373309.4A
Other languages
Chinese (zh)
Inventor
潘多龙
吕昌略
杜天彬
白冬冬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LEADRUN-MAODA CASTING Co Ltd JIANGSU
CRRC Qishuyan Institute Co Ltd
Original Assignee
LEADRUN-MAODA CASTING Co Ltd JIANGSU
CRRC Qishuyan Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LEADRUN-MAODA CASTING Co Ltd JIANGSU, CRRC Qishuyan Institute Co Ltd filed Critical LEADRUN-MAODA CASTING Co Ltd JIANGSU
Priority to CN201911373309.4A priority Critical patent/CN111036722A/en
Publication of CN111036722A publication Critical patent/CN111036722A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D3/00Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
    • B21D3/14Recontouring
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00Tools as parts of machines covered by this subclass
    • B21D37/16Heating or cooling

Abstract

The embodiment of the invention provides a casting reshaping device and a casting reshaping method, and relates to the field of machining equipment. The casting orthopedic device comprises a base, a mounting seat, a top plate and a mandril. Roof and base looks interval, the mount pad sets up in the base and lies in between roof and the base. The mounting base has a reshaping surface adapted to the target shape of the casting to be reshaped, which is located on the side of the mounting base facing away from the base. The ejector rod is in threaded connection with the top plate, and one end of the ejector rod, which is located between the top plate and the base, is used for abutting the casting to be corrected against the mounting seat. The casting orthotic method utilizes the casting orthotic device described above. The casting can be propped against the mounting seat through the ejector rod. And then locally heating the casting to enable the casting to be tightly attached to the orthopedic surface and keep the preset time length. The casting can be simply abutted by screwing the ejector rod and adjusted to the target shape, so that the casting correcting device and the casting correcting method are convenient to operate, have low requirements on site environment and have good correcting effect.

Description

Casting correcting device and casting correcting method
Technical Field
The invention relates to the field of processing equipment, in particular to a casting reshaping device and a casting reshaping method.
Background
During the production and manufacturing process of castings (especially thin-wall steel castings), deformation phenomena often occur. Therefore, the deformed casting needs to be reshaped to meet the use requirement. Thermal correction is a common method of correction, and includes local correction in which a deformed portion of a casting is corrected by locally heating and pressurizing the deformed portion. But the existing local rectification method is inconvenient to operate.
Disclosure of Invention
The object of the present invention includes providing an orthopedic casting device and an orthopedic casting method that are easy to operate.
Embodiments of the invention may be implemented as follows:
in a first aspect, embodiments of the present application provide an orthopedic casting device, comprising:
a base;
a top plate spaced from the base;
the mounting seat is arranged between the top plate and the base and is provided with a correcting surface which is adaptive to the target shape of the casting to be corrected, and the correcting surface is positioned on one side of the mounting seat, which is far away from the base;
the ejector rod penetrates through the top plate, the ejector rod is in threaded connection with the top plate, and one end, located between the top plate and the base, of the ejector rod is used for abutting the casting to be corrected against the mounting seat.
In an alternative embodiment, the top plate and the base are connected by at least two uprights.
In an optional embodiment, a sliding groove is formed in the base, one end of the upright post is in sliding fit with the sliding groove of the base, and the other end of the upright post is connected to the top plate.
In an alternative embodiment, the runner is an inverted T-shaped slot or dovetail.
In an alternative embodiment, the top plate is provided with a clamping groove, the upright post is connected to the clamping groove through a fastener, and the distance between the top plate and the base can be adjusted by adjusting the fastener.
In an alternative embodiment, the clamping groove extends from the edge of the top plate to the middle of the top plate, the clamping groove penetrates through the top plate in the thickness direction of the top plate, the stand column penetrates through the top plate, the fastening piece comprises two nuts in threaded fit with the stand column, and the two nuts are used for clamping the top plate.
In an alternative embodiment, the base is provided with a plurality of relief slots.
In an alternative embodiment, the relief groove is provided on the side of the base facing away from the top plate.
In an alternative embodiment, the bottom of the lightening groove is provided with a mounting hole, the mounting hole penetrates through the base, and the mounting seat is connected to the base through a bolt penetrating through the mounting hole.
In an alternative embodiment, the end of the ejector rod far away from the base is provided with a twisting disc.
In a second aspect, the present application provides a casting reshaping method, in which a casting is reshaped by using the casting reshaping apparatus, the casting reshaping method including:
mounting a casting to be orthopedic on the mounting seat;
heating a deformed part of the casting to be orthopedic;
and screwing the ejector rod to enable the end part of the ejector rod to locally press the deformation of the casting to be reshaped to the reshaping surface tightly attached to the mounting seat, and maintaining the preset time length.
The beneficial effects of the embodiment of the invention include, for example:
the casting orthotic device of the embodiments of the present application includes a base, a mount, a top plate, and a ram. Roof and base looks interval, the mount pad sets up in the base and lies in between roof and the base. The mounting base has a reshaping surface adapted to the target shape of the casting to be reshaped, which is located on the side of the mounting base facing away from the base. The ejector rod is in threaded connection with the top plate, and one end of the ejector rod, which is located between the top plate and the base, is used for abutting the casting to be corrected against the mounting seat. The casting can be propped against the mounting seat through the ejector rod. And then locally heating the casting to enable the casting to be tightly attached to the orthopedic surface and keep the orthopedic surface for a period of time. And (5) after the casting is cooled, checking whether the shape of the casting is matched with the shape correcting surface, and finishing the shape correction after the requirement is met. The casting can be simply abutted tightly by screwing the ejector rod, and the casting is adjusted to be in a target shape, so that the casting correcting device is convenient to operate, stable in performance, low in requirement on site environment and good in correcting effect.
The embodiment of the application provides a casting reshaping method, which utilizes the casting reshaping device to reshape a casting, and comprises the steps of installing the casting to be reshaped on an installation seat; heating a deformed part of the casting to be orthopedic; and screwing the ejector rod to enable the end part of the ejector rod to locally press the deformation of the casting to be reshaped to the reshaping surface tightly attached to the mounting seat, and maintaining the preset time length. It has convenient operation, corrects effectual characteristics.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic view of a first perspective of an orthopedic casting device provided in accordance with an embodiment of the present application;
fig. 2 is a schematic view of a second perspective of an orthopedic casting device provided by an embodiment of the present application;
fig. 3 is a schematic view of a third perspective of an orthopedic casting device according to an embodiment of the present application;
fig. 4 is a flow chart of a method of orthopedic casting provided in an embodiment of the present application.
Icon: 010-casting orthopedic devices; 100-a base; 110-relief slots; 112-bolt; 120-a chute; 200-a mounting seat; 210-a corrective surface; 300-a top plate; 310-card slot; 320-column; 330-a fastener; 400-a top rod; 410-twist disk; 020-casting.
Detailed Description
In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
The casting deformation is caused by various reasons, and deformation can occur in each process in the whole production and manufacturing process. If the design structure and the process scheme are not reasonable, the castings can be deformed due to improper operations of molding, boxing, cleaning or heat treatment and the like. Some of the casting distortions caused by the above reasons can be reduced or avoided by improving design, modifying the process, increasing the level of operation, etc. However, for some castings, the deformation is difficult to avoid in the state of the art, so that the correction work for the deformed casting occurs. Existing localized orthotics shape cast articles by localized heating, pressurization (or squeezing) at or in connection with the site of deformation of the article. However, the local correction method has strict requirements on correction sites, sometimes needs to be carried out by a furnace, sometimes needs to be manually operated by a gas cutting gun, is baked for a long time, has poor labor conditions, is unsafe, and has not ideal correction effects. To ameliorate at least one of the above problems with local orthotics, embodiments of the present application provide an orthopedic casting device.
Fig. 1 is a schematic view of a first perspective of an orthopedic casting device 010 provided by an embodiment of the present application; fig. 2 is a second perspective view of the casting orthotic device 010 provided by an embodiment of the present application; fig. 3 is a third perspective view of the casting orthotic device 010 provided by the embodiments of the present application. Referring to fig. 1 to 3, the present embodiment provides a casting orthopedic device 010, including:
a base 100;
a top plate 300 spaced apart from the chassis 100;
a mounting base 200 provided on the base 100, the mounting base 200 being located between the top plate 300 and the base 100, the mounting base 200 having an orthopedic surface 210 adapted to the target shape of a casting 020 to be orthopedic, the orthopedic surface 210 being located on a side of the mounting base 200 facing away from the base 100;
the top plate 300 is penetrated by the ejector rod 400, the ejector rod 400 is in threaded connection with the top plate 300, and one end of the ejector rod 400 between the top plate 300 and the base 100 is used for abutting the casting 020 to be orthopedic against the mounting seat 200.
With the casting correcting device 010 of the embodiment of the present application, the ejector rod 400 can be screwed to make the end of the ejector rod 400 approach the mounting seat 200, and thus the casting 020 to be corrected is only abutted against the correcting surface 210 of the mounting seat 200, so that the shape thereof is deformed to be fitted with the correcting surface 210, and the target shape is achieved. The top rod 400 and the top plate 300 are in threaded connection, so that the self-locking effect can be realized. An operator can heat the casting 020 locally after the casting 020 is abutted, the fitting shape of the casting 020 and the orthopedic surface 210 is observed after the casting 020 is cooled, the casting 020 can be taken away when the requirement is met, and the heating and cooling can be repeatedly carried out again when the requirement is not met.
In the present embodiment, the base 100 has a rectangular plate shape, and the side of the bottom plate away from the top plate 300 is provided with a plurality of lightening grooves 110 to lighten the weight of the base 100 as a whole. Preferably, the lightening grooves 110 are arranged in parallel at intervals, and both ends of the lightening grooves 110 penetrate the edge of the chassis 100.
Further, the bottom of the lightening groove 110 is provided with a mounting hole penetrating the base 100 from the thickness direction of the base 100, and the mounting seat 200 is connected to the base 100 by a bolt 112 penetrating the mounting hole. It will therefore be appreciated that the bottom of the mount 200 should have a threaded hole that mates with the bolt 112. The bottom of the lightening groove 110 may be provided with a plurality of mounting holes so that the mount 200 can be adjusted in position in the extending direction of the lightening groove 110.
Further, a plurality of sliding grooves 120 are disposed on one side of the base 100 facing the top plate 300, and in the present embodiment, the extending direction of the sliding grooves 120 is parallel to the extending direction of the lightening grooves 110. The top plate 300 is connected to the base 100 by at least two studs 320, and in the present embodiment, the top plate 300 is connected to the studs 320 by four studs 320. One end of the upright 320 is slidably engaged with the sliding groove 120 of the base 100, and the other end of the upright 320 is connected to the top plate 300.
The sliding groove 120 is an inverted T-shaped groove or dovetail groove, and in the embodiment, as shown, the sliding groove 120 is an inverted T-shaped groove, so that the post 320 is prevented from being pulled out of the groove opening. Of course, the lower end of the post 320 should also be configured as an inverted T-shaped structure that mates with the chute 120. Through the arrangement of the sliding groove 120, the position of the top plate 300 relative to the base 100 can be adjusted, so that the abutting position of the ejector rod 400 is adjusted, and therefore, the casting 020 can be reshaped by selecting a proper abutting position according to the specific deformation condition of the casting 020. In this embodiment, the two ends of the sliding slot 120 also penetrate the edges of the two sides of the base 100, and the upright 320 can slide out from either edge for removal.
In this embodiment, the top plate 300 is also substantially rectangular, the top plate 300 is provided with a plurality of slots 310, the pillars 320 are connected to the slots 310 through the fasteners 330, and the distance between the top plate 300 and the base 100 can be adjusted by adjusting the fasteners 330. Optionally, the slot 310 corresponds to the position of the chute 120 such that the plurality of posts 320 are parallel to each other and perpendicular to the top plate 300. When the fastener 330 is unlocked, the post 320 can move relative to the slot 310 so that the position of the top plate 300 can be adjusted.
Specifically, the locking groove 310 extends from the edge of the top plate 300 to the middle of the top plate 300, and the locking groove 310 penetrates the top plate 300 in the thickness direction of the top plate 300, so that the pillar 320 can penetrate the top plate 300. Fastener 330 includes two nuts that threadably engage posts 320 and can be used to hold top plate 300 when the nuts are brought together. It should be understood that the nut should have a size greater than the width of the slot 310 to serve as a stop for the top plate 300. Of course, since the acting force applied to the top plate 300 is directed away from the base 100 when the top rod 400 abuts against the casting 020, in some embodiments, only the nut above the top plate 300 may be retained as the limiting portion, and the top rod 400 may also abut against the casting 020. By the arrangement of the engaging groove 310, the vertical height of the top plate 300 can be adjusted, and the horizontal position of the top plate 300 with respect to the pillar 320 can also be adjusted.
In this embodiment, the outer side surface of the top rod 400, or the outer side surface of one of the sections, has a thread, the top rod 400 is in threaded connection with the top plate 300, and when the top rod 400 is screwed, the top rod 400 can be close to the mounting seat 200 or far from the mounting seat 200, so that the top rod 400 can be abutted against the casting 020 or can be released from abutment. In order to facilitate the operator to screw the top rod 400, a twisting disk 410 is provided at an end of the top rod 400 away from the base 100.
In the present embodiment, the mount 200 is detachably mounted to the position of the mounting hole by the bolt 112. In this embodiment, the mounting hole is a through hole without threads, and the bottom of the mounting base 200 is provided with a screw hole; in other embodiments, the mounting holes may be provided as screw holes, the holes on the mounting base 200 have no screw thread, and the bolts 112 are inserted into the mounting holes from top to bottom to fix the mounting base 200. The mounting base 200 may be provided with fixing members (not shown) for fixing the casting 020. The fixing component can be a buckle, a screw hole and the like.
The mounting 200 has an orthopedic surface 210 matching the target shape of the casting 020 to be orthopedic, and when the position of the casting 020 to be orthopedic is fitted on the orthopedic surface 210, the shape is restored to the target shape. Because the casting 020 needs to be heated, the base 100, the top plate 300, the ejector rod 400 and the upright 320 of the casting orthotic device 010 are all made of hard steel.
Fig. 4 is a flow chart of a method of orthopedic casting provided in an embodiment of the present application. The embodiment of the present application further provides a casting shape correcting method, which uses the casting shape correcting device 010 provided in the embodiment, and the casting shape correcting method includes:
and S100, mounting the casting to be orthopedic on the mounting seat.
Taking the casting shape correcting device 010 provided in the embodiment of the present application as an example, first, the parts of the casting shape correcting device 010 are assembled and fastened. The casting to be orthopedic 020 is then mounted to the mount 200.
And S200, heating the deformation part of the casting to be reshaped.
In the embodiment, the flame gun can be used for heating the deformed part of the casting 020 to be orthopedic to 500-550 ℃, and the specific heating temperature can be selected according to actual needs.
And S300, screwing the ejector rod to enable the end part of the ejector rod to locally press the deformation of the casting to be reshaped to the reshaping surface tightly attached to the mounting seat, and maintaining the preset time length.
Taking the casting shape correcting device 010 provided by the embodiment of the application as an example, after the casting 020 to be corrected is heated, the rotating torsion disc 410 enables the mandril 400 to contact the surface of the casting 020 to be corrected, the rotating torsion disc 410 is continuously pressed until the deformation part of the casting 020 to be corrected is tightly attached to the shape correcting surface 210 of the mounting seat 200, and the pressure is maintained for more than 2 hours.
Optionally, after a preset time (for example, 2 hours), the torsion disc 410 is rotated in the opposite direction, the casting 020 is released, the gap between the casting 020 and the orthopedic surface 210 is observed, and if the gap is smaller than 1mm, the orthopedic success is proved, and if the gap is larger than 1mm, the d and e operations are repeated, for example, until the requirement is met. Of course, the criteria for orthopaedic success may be adjusted to the actual circumstances.
The present embodiment provides an orthopedic casting device 010 having at least the following advantages: the ejector rod 400 can be firmly abutted to the casting 020 by adopting a screwing mode, the operation is simple, time and labor are saved, and the requirements on sites and equipment are low. The orthopedic device of the embodiment adopts the structures of the sliding groove 120, the clamping groove 310 and the like, and the position of the top plate 300 relative to the base 100 can be conveniently adjusted, so that the top plate can be better abutted against the position of the casting 020 to be abutted against, and the orthopedic effect is good. The casting correcting method provided by the present embodiment uses the casting correcting device 010 of the present embodiment, and therefore, has the above-described advantageous effects.
In summary, the orthopedic casting device of the present application includes a base, a mounting base, a top plate, and a post rod. The top plate is spaced from the base; the mounting seat is arranged on the base and is positioned between the top plate and the base. The mounting base has a reshaping surface adapted to the target shape of the casting to be reshaped, which is located on the side of the mounting base facing away from the base. The ejector rod is in threaded connection with the top plate, and one end of the ejector rod, which is located between the top plate and the base, is used for abutting the casting to be corrected against the mounting seat. The casting can be propped against the mounting seat through the ejector rod. And then locally heating the casting to enable the casting to be tightly attached to the orthopedic surface and keep the orthopedic surface for a period of time. And (5) after the casting is cooled, checking whether the shape of the casting is matched with the shape correcting surface, and finishing the shape correction after the requirement is met. The casting can be simply abutted tightly by screwing the ejector rod, and the casting is adjusted to be in a target shape, so that the casting correcting device is convenient to operate, stable in performance, low in requirement on site environment and good in correcting effect.
The embodiment of the application provides a casting reshaping method, which utilizes the casting reshaping device to reshape a casting, and comprises the steps of installing the casting to be reshaped on an installation seat; heating a deformed part of the casting to be orthopedic; and screwing the ejector rod to enable the end part of the ejector rod to locally press the deformation of the casting to be reshaped to the reshaping surface tightly attached to the mounting seat, and maintaining the preset time length. It has convenient operation, corrects effectual characteristics.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (11)

1. An orthopedic casting device, comprising:
a base;
a top plate spaced from the base;
a mounting seat arranged on the base, wherein the mounting seat is positioned between the top plate and the base, the mounting seat is provided with an orthopedic surface which is adaptive to the target shape of a casting to be orthopedic, and the orthopedic surface is positioned on one side of the mounting seat, which is away from the base;
the ejector rod penetrates through the top plate, the ejector rod is in threaded connection with the top plate, and one end, located between the top plate and the base, of the ejector rod is used for enabling the casting to be shaped to be abutted against the mounting seat.
2. The cast orthopedic device of claim 1, wherein the top plate and the base are connected by at least two posts.
3. The orthopedic casting device of claim 2, wherein the base is provided with a sliding slot, one end of the post slidably engages the sliding slot of the base, and the other end of the post is connected to the top plate.
4. The orthopedic casting device of claim 3, wherein the runner is an inverted T-shaped slot or a dovetail slot.
5. The cast orthopedic device of claim 2, wherein the top plate is provided with a slot, the post is connected to the slot by a fastener, and the distance separating the top plate from the base is adjustable by adjusting the fastener.
6. The orthopedic casting device according to claim 5, wherein the slot extends from an edge of the top plate to a middle portion of the top plate, the slot extends through the top plate in a thickness direction of the top plate, the post is disposed through the top plate, and the fastener includes two nuts threadedly engaged with the post, the two nuts being configured to clamp the top plate.
7. The cast orthopedic device of claim 1 wherein the base is provided with a plurality of relief grooves.
8. The cast orthopedic device of claim 7, wherein the relief groove is disposed on a side of the base facing away from the top plate.
9. The cast orthopedic device of claim 7 wherein a bottom of the relief groove is provided with a mounting hole extending through the base, the mounting seat being connected to the base by a bolt extending through the mounting hole.
10. The cast orthopedic device of claim 1 wherein an end of the pushrod distal to the base is provided with a twist disk.
11. A casting reshaping method for reshaping a casting to be reshaped using the casting reshaping apparatus of any one of claims 1 to 10, the casting reshaping method comprising:
mounting the casting to be orthopedic on the mount;
heating the deformed part of the casting to be orthopedic;
and screwing the ejector rod to enable the end part of the ejector rod to locally press the deformation of the casting to be reshaped to be tightly attached to the reshaping surface of the mounting seat, and maintaining the preset time length.
CN201911373309.4A 2019-12-27 2019-12-27 Casting correcting device and casting correcting method Pending CN111036722A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911373309.4A CN111036722A (en) 2019-12-27 2019-12-27 Casting correcting device and casting correcting method

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Application Number Priority Date Filing Date Title
CN201911373309.4A CN111036722A (en) 2019-12-27 2019-12-27 Casting correcting device and casting correcting method

Publications (1)

Publication Number Publication Date
CN111036722A true CN111036722A (en) 2020-04-21

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CN207325654U (en) * 2017-09-19 2018-05-08 湖北太岳园林古建工程股份有限公司 A kind of lid formula metallic cultural relics repair orthoses
CN207655668U (en) * 2017-11-30 2018-07-27 郑州宏拓精密工具有限公司 Crankshaft hole cuts with scissors top gem of a girdle-pendant bar brace

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